JP7600823B2 - Power transmission device and method for assembling the power transmission device - Google Patents

Description

The present invention relates to a power transmission device and a method for assembling the power transmission device.

In vehicles that have an engine as a drive source and transmit power from the drive source to the drive wheels via a transmission, a flywheel is attached to the output shaft of the engine and the flywheel is connected to the input shaft of the transmission in order to suppress vibrations caused by torque fluctuations in the engine.

When a flywheel attached to the output shaft of an engine and an input shaft of a transmission are connected by spline engagement, a first power transmission member and a second power transmission member that are rotatably provided in a power transmission path from a drive source to a drive wheel may be assembled by spline engagement.

When the splined portions of the first and second power transmission members, which are rotatably arranged in the power transmission path, are spline-fitted and assembled, a rattle noise can occur at the splined portion of the first and second power transmission members when power is not being transmitted, which can cause noise inside the vehicle cabin.

In response to this, it has been thought that by using a spring that urges the second power transmission member in the rotational direction relative to the first power transmission member, and urging the splined portion of the second power transmission member in the rotational direction relative to the splined portion of the first power transmission member, it is possible to suppress the rattle noise between the first and second power transmission members at the splined engagement portion between the first and second power transmission members.

For example, Patent Document 1 discloses a mechanism in which a spring retaining member that holds a spring is engaged with a splined portion of a first power transmission member and attached to the first power transmission member, and then a second power transmission member is spline-fitted to the first power transmission member, and the splined portion of the second power transmission member disengages the spring retaining member from the splined portion of the first power transmission member, thereby applying a rotational biasing force between the first power transmission member and the second power transmission member.

Special Publication No. 2008-544193

The device described in Patent Document 1 can suppress rattle noise at the spline engagement portion of the first power transmission member and the second power transmission member by using a spring that urges the second power transmission member in the rotational direction relative to the first power transmission member, but the spring retaining member that holds the spring is engaged with the spline portions of the first power transmission member and the second power transmission member.

For this reason, it is necessary to change the shape of the spline portions of the first and second power transmission members depending on the spring retaining member, and because changing the shape of the spline portions can lead to a complicated configuration and high costs, it is desirable to suppress rattle noise with a relatively simple configuration. Also, in a power transmission device in which the first and second power transmission members are assembled by spline engagement, it is desirable to be able to assemble the first and second power transmission members relatively easily.

The present invention aims to suppress rattle noise at the spline engagement portion of the first and second power transmission members with good assembly ease using a relatively simple configuration in a power transmission device having first and second power transmission members that are assembled through spline engagement.

The present invention relates to a power transmission device having a first power transmission member and a second power transmission member assembled by spline engagement, the power transmission device comprising: a spring portion that is elastically displaceable in a rotational direction; a locking portion provided on one end of the spring portion and locked to the first power transmission member; and a spline portion provided on the other end of the spring portion. The device further comprises a biasing member that is disposed on one axial side of the first power transmission member and locked to the first power transmission member, and in a first elastic displacement state of the spring portion, the spline portion engages with a spline portion of the second power transmission member to bias the second power transmission member to one side in the rotational direction relative to the first power transmission member; and a second elastic biasing member that is disposed on one axial side of the biasing member and in which the spring portion is elastically displaced from the first elastic displacement state. A power transmission device is provided that includes a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a displaced state, and a release operation portion is provided on one axial side of the spline portion of the second power transmission member such that when the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member from one axial side of the temporary fastening member through the spline portion of the biasing member, the spline portion of the biasing member engages with the spline portion of the second power transmission member in the first elastic displacement state of the spring portion to bias the second power transmission member to one side in the rotational direction relative to the first power transmission member.

According to the present invention, when the first and second power transmission members are assembled by spline fitting, a biasing member is used that is engaged with the first power transmission member and whose spline portion engages with the spline portion of the second power transmission member in a first elastically displaced state of the spring portion to bias the second power transmission member in one direction in the rotational direction relative to the first power transmission member, and a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastically displaced state in which the spring portion is elastically displaced from the first elastically displaced state, and a release operation portion is provided on one axial side of the spline portion of the second power transmission member to release the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion.

As a result, the biasing member is attached by engaging it with the first power transmission member, the temporary fastening member is attached to the first power transmission member and the biasing member to temporarily fasten the biasing member to the first power transmission member in the second elastic displacement state of the spring portion, and the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member through the spline portion of the biasing member to assemble the second power transmission member to the first power transmission member, whereby the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion of the temporary fastening member is released and the second power transmission member is biased to one side in the rotational direction relative to the first power transmission member, thereby suppressing the rattle noise of the spline fitting portions of the first and second power transmission members.

By engaging the biasing member with the first power transmission member, temporarily fixing the biasing member to the first power transmission member with a temporary fixing member, and spline-fitting the second power transmission member to the first power transmission member without changing the shape of the splined portions of the first and second power transmission members, the second power transmission member can be biased to one side in the rotational direction relative to the first power transmission member, making assembly relatively easy. Therefore, with a relatively simple configuration, it is possible to suppress rattle noise at the splined fitting portions of the first and second power transmission members with good assembly properties.

The biasing member includes a spring portion, a locking portion, a spline portion, an inner annular portion, an outer annular portion, and a temporarily fixed portion that is temporarily fixed to the temporary fixing portion, the locking portion is connected to the outer annular portion, the spline portion and the temporarily fixed portion are connected to the inner annular portion, and the spring portion has one end connected to the outer annular portion and the other end connected to the inner annular portion, and can be elastically displaced in the rotational direction by moving the inner annular portion to the other side in the rotational direction relative to the outer annular portion.

This configuration uses a biasing member having a spring portion that is elastically displaced in the rotational direction when the inner annular portion moves in the other direction relative to the outer annular portion. This eliminates the need to use a spring retaining member to retain the spring, as is the case when a spring is used as the biasing member, and improves ease of assembly.

The temporary fastening member includes a temporary fastening main body portion through which the spline portion of the second power transmission member is inserted, and a temporary fastening portion extending from the temporary fastening main body portion to the other axial direction, the temporary fastening portion having a regulated portion regulated by the first power transmission member on one side in the rotational direction, and an abutting portion abutting the temporarily fastened portion on the other side in the rotational direction, and a recess recessed in the one axial direction on one side of the abutting portion, the recess being formed such that when the release operating portion releases the temporary fastening of the biasing member to the first power transmission member, the release operating portion of the second power transmission member moves the temporary fastening main body portion and the temporary fastening portion to the other axial direction, and the temporarily fastened portion is positioned within the recess.

According to this configuration, a recess is provided on the other rotational side of the temporary fastening portion of the temporary fastening member and on one axial side of the abutting portion, so that when the temporary fastening of the biasing member to the first power transmission member is released, the temporarily fastened portion can be positioned within the recess, thereby releasing the temporary fastening of the biasing member to the first power transmission member.

It is preferable to provide an assist mechanism that assists the release operation of the release operation unit in releasing the temporary fastening of the biasing member.

According to this configuration, the assist mechanism assists the release operation of the release operation unit in releasing the temporary fastening of the biasing member, making it relatively easy to release the temporary fastening of the biasing member, and improving the ease of assembly of the second power transmission member to the first power transmission member.

The biasing member has a temporarily fixed portion that is temporarily fixed to the temporary fixing portion, and the temporarily fixed portion has a regulated portion that is regulated by the first power transmission member on one side in the rotational direction and an abutting portion that abuts against the temporarily fixed portion on the other side in the rotational direction, and the abutting portion is formed by an inclined surface portion that inclines toward one side in the rotational direction as it approaches one side in the axial direction, and the assist mechanism is preferably configured by the inclined surface portion.

According to this configuration, the inclined surface portion formed on the abutment portion of the temporary fastening portion that constitutes the assist mechanism is inclined to one side in the rotational direction as it approaches one side in the axial direction, so that the biasing force applied to the abutment portion of the temporary fastening portion by the spring portion of the biasing member from the temporarily fastened portion of the biasing member to one side in the rotational direction can be converted into a force in a direction that releases the temporary fastening of the biasing member to the first power transmission member. This makes it possible to reduce the operating force required to release the temporary fastening of the biasing member, improving ease of assembly.

It is preferable that the temporary fastening member is fixedly attached to the outer annular portion of the biasing member.

With this configuration, the temporary fastening member is fixedly attached to the outer annular portion of the biasing member, so that circumferential rattle of the temporary fastening member can be suppressed when the first and second power transmission members are spline-fitted and assembled.

It is preferable that multiple temporary fastening members are attached to the biasing member at equal intervals in the circumferential direction.

With this configuration, multiple temporary fastening members are attached to the biasing member at equal intervals in the circumferential direction, making it possible to effectively suppress rattle noise at the spline engagement portion of the first and second power transmission members.

The temporary fastening member has a fixed portion fixed to the biasing member, a temporary fastening portion, and a connection portion that connects the fixed portion and the temporary fastening portion and fastens the fixed portion to the biasing member while the temporary fastening portion is elastically displaced to the other axial direction relative to the fixed portion, and can be configured such that the temporary fastening portion moves by elastic force to one axial direction side relative to the fixed portion fixed to the biasing member, and the temporary fastening portion temporarily fastens the biasing member.

With this configuration, the temporary fastening member is configured so that the temporary fastening portion moves by elastic force to one side in the axial direction relative to the fixed portion fixed to the biasing member, and the temporary fastening portion temporarily fastens the biasing member. This can suppress the rattle noise of the spline engagement portion of the first and second power transmission members, and can also suppress circumferential rattle of the temporary fastening member when the first and second power transmission members are spline-engaged and assembled.

The release operation unit may be provided on a case that rotatably supports the second power transmission member.

According to this configuration, the release operation part is provided on the case that rotatably supports the second power transmission member, so that the temporary fastening of the biasing member can be released by the release operation part provided on the case that moves axially to the other side together with the second power transmission member, and the temporary fastening of the biasing member can be released using the inertial mass of the case.

It is preferable to have an assist mechanism that assists the release operation of the release operation unit in releasing the temporary fastening of the biasing member.

According to this configuration, the assist mechanism assists the release operation of the release operation unit in releasing the temporary fastening of the biasing member, making it relatively easy to release the temporary fastening of the biasing member, and improving the ease of assembly of the second power transmission member to the first power transmission member.

The biasing member has a temporarily fixed portion that is temporarily fixed to the temporarily fixed portion, the temporarily fixed portion has an abutment portion that abuts the temporarily fixed portion on the other side in the rotational direction, the abutment portion is formed by an inclined surface portion that inclines toward one side in the rotational direction as it approaches one side in the axial direction, and the assist mechanism is preferably configured by the inclined surface portion.

According to this configuration, the inclined surface portion formed on the abutment portion of the temporary fastening portion that constitutes the assist mechanism is inclined to one side in the rotational direction as it approaches one side in the axial direction, so that the biasing force applied to the abutment portion of the temporary fastening portion by the spring portion of the biasing member from the temporarily fastened portion of the biasing member to one side in the rotational direction can be converted into a force in a direction that releases the temporary fastening of the biasing member to the first power transmission member, thereby reducing the operating force required to release the temporary fastening of the biasing member and improving ease of assembly.

The first power transmission member is a flywheel connected to the output shaft of the engine, and the second power transmission member is the input shaft of the transmission.

This configuration allows a power transmission device with a flywheel and a transmission input shaft that are assembled through spline engagement to suppress rattle noise at the spline engagement portion of the flywheel and the transmission input shaft with good assembly ease through a relatively simple configuration.

The present invention also relates to a method for assembling a power transmission device having a first power transmission member and a second power transmission member assembled by spline engagement, the method comprising the steps of: attaching a biasing member having a spring portion elastically displaceable in a rotational direction, a locking portion provided on one end side of the spring portion and locked to the first power transmission member, and a spline portion provided on the other end side of the spring portion, the spline portion engaging with the spline portion of the second power transmission member in a first elastic displacement state of the spring portion to bias the second power transmission member in one direction in the rotational direction relative to the first power transmission member by engaging the locking portion to the first power transmission member from one axial side; and attaching a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastic displacement state in which the spring portion is elastically displaced from the first elastic displacement state to the first power transmission member and the biasing member from one axial side of the biasing member to bias the second power transmission member in the second elastic displacement state of the spring portion. The method for assembling a power transmission device includes the steps of: temporarily fixing the biasing member to the first power transmission member in an elastically displaced state; and assembling the second power transmission member to the first power transmission member by spline-fitting the spline portion of the second power transmission member through the spline portion of the biasing member from one axial side of the temporary fixing member, and a release operation unit is provided on one axial side of the spline portion of the second power transmission member to release the temporary fixing of the biasing member to the first power transmission member by the temporary fixing unit of the temporary fixing member so that when the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member, the spline portion of the biasing member engages with the spline portion of the second power transmission member in the first elastically displaced state of the spring unit to bias the second power transmission member to one rotational direction side relative to the first power transmission member.

According to the present invention, when the first and second power transmission members are assembled by spline fitting, a biasing member is used that is engaged with the first power transmission member and whose spline portion engages with the spline portion of the second power transmission member in a first elastically displaced state of the spring portion to bias the second power transmission member in one direction in the rotational direction relative to the first power transmission member, and a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastically displaced state in which the spring portion is elastically displaced from the first elastically displaced state, and a release operation portion is provided on one axial side of the spline portion of the second power transmission member to release the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion.

As a result, the biasing member is attached by engaging it with the first power transmission member, the temporary fastening member is attached to the first power transmission member and the biasing member to temporarily fasten the biasing member to the first power transmission member in the second elastic displacement state of the spring portion, and the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member through the spline portion of the biasing member to assemble the second power transmission member to the first power transmission member, whereby the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion of the temporary fastening member is released and the second power transmission member is biased to one side in the rotational direction relative to the first power transmission member, thereby suppressing the rattle noise of the spline fitting portions of the first and second power transmission members.

By engaging the biasing member with the first power transmission member, temporarily fixing the biasing member to the first power transmission member with a temporary fixing member, and spline-fitting the second power transmission member to the first power transmission member without changing the shape of the splined portions of the first and second power transmission members, the second power transmission member can be biased to one side in the rotational direction relative to the first power transmission member, making assembly relatively easy. Therefore, with a relatively simple configuration, it is possible to suppress rattle noise at the splined fitting portions of the first and second power transmission members with good assembly properties.

The power transmission device and the method for assembling the power transmission device according to the present invention can be easily assembled with a relatively simple configuration, and can suppress rattle noise caused by the spline engagement between the first and second power transmission members.

1 is a schematic diagram of a power unit including a power transmission device according to a first embodiment of the present invention. FIG. FIG. FIG. FIG. 4 is a front view of the flywheel, the biasing member, and the temporary fastening member. FIG. 7 is a cross-sectional view of the flywheel and the urging member taken along line Y7-Y7 in FIG. 5. 13 is a front view of the urging member and the flywheel in which the inner annular portion has been moved to the other side in the rotational direction relative to the outer annular portion. FIG. 11 is a perspective view showing a state in which a biasing member is temporarily fixed to a flywheel by a temporary fixing member. FIG. 10 is an enlarged view of the temporary fastening portion of the temporary fastening member shown in FIG. 9 and its vicinity. 11 is a cross-sectional view of the flywheel, the biasing member, and the temporary fastening member taken along the line Y11-Y11 in FIG. 10. FIG. 4 is an explanatory diagram for explaining assembly of an input shaft to a flywheel. 13 is an explanatory diagram for explaining an operation for releasing the temporary fastening of the urging member to the flywheel. FIG. 13 is another explanatory view for explaining the operation of releasing the temporary fastening of the urging member to the flywheel. FIG. 13 is a diagram showing a spline fitting portion in which an input shaft is biased against a flywheel by a biasing member. FIG. FIG. 6 is a perspective view of a power transmission device according to a second embodiment of the present invention. FIG. FIG. FIG. FIG. 4 is a perspective view of a biasing member and a temporary fastening member. 21 is an enlarged view of the temporary fastening portion of the temporary fastening member shown in FIG. 20 and its vicinity. 22 is a cross-sectional view of the urging member and the temporary fastening member taken along line Y22-Y22 in FIG. 21. 13A and 13B are diagrams illustrating a state in which the urging member is temporarily fixed by a temporary fixing member. 13 is a diagram showing a state in which the urging member and the temporary fastening member are attached to the flywheel. FIG. FIG. 4 is an explanatory diagram for explaining assembly of an input shaft to a flywheel. 13A and 13B are diagrams illustrating a modified example of the biasing member according to the second embodiment. 13A and 13B are diagrams illustrating a modified example of the temporary fastening member according to the second embodiment. 10 is an explanatory diagram for explaining temporary fastening of the urging member by the temporary fastening member. FIG. FIG. 11 is a perspective view of a power transmission device according to a third embodiment of the present invention. FIG. FIG. FIG. FIG. 4 is a perspective view of a biasing member and a temporary fastening member. 34 is a cross-sectional view of the temporary fastening portion of the temporary fastening member shown in FIG. 33 and its vicinity. 13A and 13B are diagrams illustrating a state in which the urging member is temporarily fixed by a temporary fixing member. 13 is a diagram showing a state in which the urging member and the temporary fastening member are attached to the flywheel. FIG. FIG. 4 is an explanatory diagram for explaining assembly of an input shaft to a flywheel. 13A and 13B are diagrams illustrating a modified example of the temporary fastening member according to the third embodiment. 10 is an explanatory diagram for explaining temporary fastening of the urging member by the temporary fastening member. FIG.

The following describes an embodiment of the present invention with reference to the attached drawings.

Figure 1 is a schematic diagram of a power unit equipped with a power transmission device according to a first embodiment of the present invention. As shown in Figure 1, the power unit 1 equipped with the power transmission device according to the first embodiment of the present invention is mounted on a vehicle such as a front engine/rear drive vehicle and is arranged so that its axis extends in the fore-and-aft direction of the vehicle body, and is equipped with an engine 2 as a drive source and an automatic transmission 3 as a transmission connected to the engine 2. The engine 2 is, but is not limited to, an in-line four-cylinder engine with four cylinders arranged in line.

The automatic transmission 3 is arranged coaxially with the output shaft 4 of the engine 2 and is connected to a flywheel 10 fixedly attached to the output shaft 4 of the engine 2 without a torque converter. The automatic transmission 3 has an input shaft 20 housed in the transmission case 5 and rotatably supported by the transmission case 5.

Although not shown, the automatic transmission 3 also includes a transmission mechanism having multiple planetary gear sets (planetary gear mechanisms) and multiple frictional fastening elements such as clutches and brakes, and an output shaft. The transmission mechanism is configured to selectively fasten the multiple frictional fastening elements to switch the power transmission path that passes through each planetary gear set, thereby achieving a predetermined gear shift according to the operating state of the vehicle.

The automatic transmission 3 is attached to the engine 2 by assembling the input shaft 20 through spline engagement with the flywheel 10 attached to the output shaft 4 of the engine 2. In the automatic transmission 3, the power from the engine 2 is transmitted from the flywheel 10 to the input shaft 20, and the power from the engine 2 is transmitted from the output shaft to the drive wheels through the transmission mechanism.

The power transmission device 6 according to this embodiment includes a flywheel 10 as a first power transmission member and an input shaft 20 as a second power transmission member, which are assembled by spline engagement. The power transmission device 6 uses a biasing member that biases the input shaft 20 in the rotational direction relative to the flywheel 10, and a temporary fastening member that temporarily fastens the biasing member to the flywheel 10, and is configured to be easy to assemble and suppress teeth rattle noise at the spline engagement portion between the flywheel 10 and the input shaft 20.

2 is a perspective view of the power transmission device, FIG. 3 is a side view of the power transmission device, FIG. 4 is an exploded perspective view of the power transmission device, FIG. 5 is a front view of the flywheel, the biasing member, and the temporary fastening member, FIG. 6 is a front view of the flywheel and the biasing member, and FIG. 7 is a cross-sectional view of the flywheel and the biasing member taken along line Y7-Y7 in FIG. 5.

As shown in Figures 2 to 7, the power transmission device 6, which is assembled by spline-fitting the flywheel 10 and the input shaft 20, which are rotatably provided in the power transmission path from the engine 2 to the drive wheels, includes a biasing member 30 and a temporary fastening member 40 that are disposed between the flywheel 10 and the input shaft 20.

As shown in FIG. 3, the biasing member 30 is disposed on one axial side of the flywheel 10, which is the side opposite the engine, the temporary fastening member 40 is disposed on one axial side of the biasing member 30, and the input shaft 20 is disposed on one axial side of the temporary fastening member 40. The biasing member 30 and the temporary fastening member 40 are each formed in a substantially flat plate shape in a radial direction substantially perpendicular to the axial direction of the flywheel 10 and the input shaft 20.

Although not shown, the flywheel 10 is fixed to the output shaft 4 of the engine 2 using fastening bolts, and is formed into a ring shape extending in a plate-like shape in a radial direction substantially perpendicular to the axial direction. As shown in FIG. 4, the flywheel 10 has a protruding portion 11 protruding to one axial direction at the radial center, and the protruding surface of the protruding portion 11 is formed in a flat shape in a direction substantially perpendicular to the axial direction. The flywheel 10 also has a spline portion 12 formed in the radial center that is spline-fitted to the input shaft 20. The spline portion 12 has splines whose teeth extend in the axial direction, and is formed on the inner peripheral surface of the flywheel 10.

The flywheel 10 is formed with a first opening 13 as a locked portion 13 to which the biasing member 30 is locked, and a second opening 14 as a restricting portion 14 that restricts the temporary fastening member 40 from moving in one direction in the rotational direction. The first opening 13 and the second opening 14 are each disposed radially outward from the spline portion 12, and a plurality of openings, specifically three openings, are formed at equal intervals in the circumferential direction, which is the rotational direction of the flywheel 10. The first openings 13 and the second openings 14 are disposed alternately in the circumferential direction of the flywheel 10 at positions that overlap radially of the flywheel 10.

As shown in Figs. 5 and 7, the first opening 13 of the flywheel 10 penetrates the flywheel 10 in the axial direction and extends linearly in the radial direction, forming an elongated hole. As shown in Fig. 5 and Fig. 11 described later, the second opening 14 of the flywheel 10 penetrates the flywheel 10 in the axial direction and extends linearly in the radial direction, forming an elongated hole.

As shown in Figures 4 and 6, the biasing member 30 is formed in a circular ring shape extending in a plate shape in a direction perpendicular to the axial direction. The biasing member 30 includes an inner annular portion 32 arranged radially inward and formed in a circular ring shape, and an outer annular portion 31 arranged radially outward and formed in a circular ring shape, and the outer annular portion 31 is arranged concentrically radially outward from the inner annular portion 32.

The biasing member 30 also includes a spring portion 33 that can be compressed in the rotational direction, a locking portion 34 that is locked to the flywheel 10, a spline portion 35 that is spline-fitted to the input shaft 20, and a temporarily fixed portion 36 that is temporarily fixed to the temporary fixing member 40. The spline portion 35 of the biasing member 30 has a spline whose teeth extend in the axial direction, and is formed on the inner peripheral surface of the inner annular portion 32 and connected to the inner annular portion 32. The spline portion 35 of the biasing member 30 engages with the spline portion 21 of the input shaft 20 to bias it, and the spline portion 21 can be formed with lower machining precision than the flywheel 10 and the input shaft 20.

The spring portion 33 of the biasing member 30 includes a first radial extension portion 33a extending radially outward in a straight line from the inner annular portion 32, a second radial extension portion 33b extending radially inward from the outer annular portion 31 in a straight line substantially parallel to the first radial extension portion 33a, a third radial extension portion 33c extending radially in a straight line substantially parallel to the first radial extension portion 33a and the second radial extension portion 33b between the first radial extension portion 33a and the second radial extension portion 33b, an outer connecting portion 33d extending in an arc shape connecting the radial outer sides of the first radial extension portion 33a and the third radial extension portion 33c, and an inner connecting portion 33e extending in an arc shape connecting the radial inner sides of the third radial extension portion 33c and the second radial extension portion 33b.

The spring portion 33 has one end connected to the outer annular portion 31 and the other end connected to the inner annular portion 32, and is formed in a generally S-shape when viewed from the other axial direction. The spring portion 33 is configured to be compressible in the rotational direction by moving the first radial extension portion 33a in the other rotational direction relative to the second radial extension portion 33b as the inner annular portion 32 moves in the other rotational direction relative to the outer annular portion 31.

The locking portion 34 of the biasing member 30 extends from the tip of the first arm portion 37, which extends radially inward from the outer annular portion 31 on one side of the rotational direction of the spring portion 33, to one side in the axial direction (see FIG. 7). The locking portion 34 is formed in a substantially rectangular shape in a cross section perpendicular to the axial direction, and is inserted into and locked in the first opening 13 of the flywheel 10.

The temporarily fixed portion 36 of the biasing member 30 is provided on the tip side of the second arm portion 38 that extends radially outward in a substantially straight line from the inner annular portion 32 on the other side of the rotational direction of the spring portion 33. The temporarily fixed portion 36 of the biasing member 30 is recessed on the end face on one side of the rotational direction of the second arm portion 38 toward the other side of the rotational direction, and is provided at a position corresponding to the second opening 14 of the flywheel 10.

The spring portion 33, the locking portion 34, and the temporarily fixed portion 36 are each formed in multiples, specifically three, at equal intervals in the circumferential direction of the biasing member 30. Each spring portion 33 is disposed between the locking portion 34, which is disposed on one side in the rotational direction, and the temporarily fixed portion 36, which is disposed on the other side in the rotational direction.

The biasing member 30 is engaged with the flywheel 10, and in a first compression state of the spring portion 33 in which the inner annular portion 32 is moved to the other side in the rotational direction relative to the outer annular portion 31, the spline portion 35 engages with the spline portion 21 of the input shaft 20, biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

A pin insertion hole 39 is formed at the tip of the second arm portion 38 of the biasing member 30. The pin insertion hole 39 is formed so that a pin provided on a rotating tool (not shown) can be inserted into the pin insertion hole 39. When the rotating tool is moved in the other direction in the rotational direction with the pin of the rotating tool inserted into the pin insertion hole 39, the inner annular portion 32 of the biasing member 30 is moved in the other direction in the rotational direction.

As shown in FIG. 4, the temporary fastening member 40 includes a temporary fastening body 41 that extends in a plate shape in a direction perpendicular to the axial direction and is formed in an annular shape, and a temporary fastening portion 42 that extends from the temporary fastening body 41 to the other side in the axial direction. The temporary fastening body 41 is adapted to allow the spline portion 21 of the input shaft 20 to be inserted therethrough.

The temporary fastening portion 42 extends from the temporary fastening main body portion 41 to the other axial side in a generally rectangular cross-section, and is formed so as to temporarily fasten the urging member 30 to the flywheel 10 when the spring portion 33 of the urging member 30 is in a second compressed state, which is compressed from the first compressed state. A plurality of temporary fastening portions 42, specifically three, are formed at equal intervals in the circumferential direction of the temporary fastening member 40. The temporary fastening portions 42 are formed corresponding to the second opening 14 of the flywheel 10 so as to be inserted into the second opening 14 of the flywheel 10.

As shown in FIG. 11, which will be described later, the temporary fastening portion 42 has a restricted portion 43 on one side in the rotational direction that is restricted by the second opening 14 of the flywheel 10, and has an abutment portion 44 on the other side in the rotational direction that abuts against the temporary fastening portion 36 of the biasing member 30, and a recess 45 that is recessed in one direction in the rotational direction on one axial side of the abutment portion 44.

The restricted portion 43 is formed by an end face on one side in the rotational direction of the temporary fastening portion 42 that extends linearly in the axial direction of the temporary fastening member 40, and the abutment portion 44 is formed by an end face on the other side in the rotational direction of the temporary fastening portion 42 that extends linearly at a predetermined angle to the axial direction of the temporary fastening member 40.

The abutment portion 44 is formed by an inclined surface portion that inclines toward one side in the rotation direction as it approaches one side in the axial direction. The abutment portion 44 is provided with a first inclined surface portion 44a as a first abutment portion 44a that is provided on one side in the axial direction and extends linearly at a predetermined angle θ1 with respect to the axial direction, and a second inclined surface portion 44b as a second abutment portion 44b that is provided on the other side in the axial direction and extends linearly at a predetermined angle θ2 with respect to the axial direction, and the predetermined angle θ2 is formed to be larger than the predetermined angle θ1. The predetermined angle θ1 is set to an angle between 5 degrees and 15 degrees, for example, and the predetermined angle θ2 is set to an angle between 30 degrees and 45 degrees, for example.

The recess 45 of the temporary fastening portion 42 is formed by the end face on the other side of the temporary fastening portion 42 in the rotational direction, and is recessed in a substantially rectangular shape on one side in the rotational direction. The recess 45 is formed so that when the input shaft 20 is spline-fitted to the flywheel 10, the temporarily fastened portion 36 of the biasing member 30 is positioned within the recess 45 without abutting against the recess 45.

As shown in FIG. 4, the input shaft 20 has a spline portion 21 on its outer circumferential surface on the other axial side, which is the engine side. The spline portion 21 of the input shaft 20 has splines whose teeth extend in the axial direction, and is formed to be spline-fitted with the spline portion 12 of the flywheel 10 and the spline portion 35 of the biasing member 30.

The input shaft 20 is also provided with a release operation section 22 on one axial side of the spline section 21, which releases the temporary fastening of the biasing member 30 to the flywheel 10 by the temporary fastening section 42 of the temporary fastening member 40. The release operation section 22 extends radially outward from the outer circumferential surface of the input shaft 20 in a plate shape in a direction perpendicular to the axial direction, and is formed in a circular shape. The outer circumferential surface of the release operation section 22 is larger than the inner circumferential surface of the temporary fastening main body section 41 of the temporary fastening member 40.

The release operation section 22 is formed so that when the spline section 21 of the input shaft 20 is inserted through the temporary fastening member 40 from one axial side and spline-fitted to the spline section 12 of the flywheel 10 through the spline section 35 of the biasing member 30, in the first compressed state of the spring section 33, the spline section 35 of the biasing member 30 engages with the spline section 21 of the input shaft 20 to bias the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

In the power transmission device 6, the biasing member 30 is attached to the flywheel 10 by engaging it from one axial side, and then the temporary fixing member 40 is attached to the flywheel 10 and the biasing member 30 from one axial side to temporarily fix the biasing member 30 to the flywheel 10 in the second compressed state of the spring portion 33, and then the input shaft 20 is spline-fitted from one axial side to the spline portion 12 of the flywheel 10 through the spline portion 35 of the biasing member 30, and the input shaft 20 is spline-fitted to the flywheel 10 and assembled.

Figure 8 is a front view of the biasing member and the flywheel in which the inner annular portion has been moved toward the other side in the rotational direction relative to the outer annular portion. When assembling the input shaft 20 to the flywheel 10 through spline fitting, first, as shown in Figure 6, the biasing member 30 is attached to the flywheel 10 by engaging the locking portion 34 of the biasing member 30 with the locked portion 13 of the flywheel 10.

As shown in FIG. 8, the second arm portion 38 of the urging member 30 is moved to the other side in the rotational direction with the locking portion 34 locked to the locked portion 13 of the flywheel 10. The inner annular portion 32 of the urging member 30 is moved to the other side in the rotational direction relative to the outer annular portion 31 so that the spring portion 33 is in a second compressed state, which is compressed from a first compressed state in which the spring portion 33 urges the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

Figure 9 is a perspective view showing the state in which the urging member is temporarily fixed to the flywheel by the temporary fixing member, Figure 10 is an enlarged view of the temporary fixing portion of the temporary fixing member shown in Figure 9 and its vicinity, and Figure 11 is a cross-sectional view of the flywheel, urging member, and temporary fixing member taken along line Y11-Y11 in Figure 10. As shown in Figure 9, with the spring portion 33 of the urging member 30 compressed to the second compressed state, a temporary fixing member 40 is attached to the flywheel 10 and the urging member 30 to temporarily fix the urging member 30 to the flywheel 10.

As shown in Figures 10 and 11, the temporary fastening member 40 is inserted into the second opening 14 of the flywheel 10 so that the abutting portion 44 of the temporary fastening portion 42 abuts against the temporarily fastened portion 36 of the urging member 30 and the regulated portion 43 of the temporary fastening portion 42 is regulated by the regulating portion 14 of the flywheel 10, temporarily fastening the urging member 30 to the flywheel 10. When the urging member 30 is temporarily fastened to the flywheel 10 by the temporary fastening member 40, the spline portion 35 of the urging member 30 and the spline portion 12 of the flywheel 10 are arranged so that their splines approximately match.

Figure 12 is an explanatory diagram for explaining the assembly of the input shaft to the flywheel. Next, as shown in Figure 12, the input shaft 20 is assembled from one axial side so that the spline portion 21 passes through the temporary fastening member 40 and is spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 35 of the biasing member 30.

Figure 13 is an explanatory diagram for explaining the operation of releasing the temporary fastening of the urging member to the flywheel. When the input shaft 20 is assembled to the flywheel 10, as shown in Figure 13, the spline portion 21 of the input shaft 20 is inserted through the temporary fastening member 40 and splined to the spline portion 12 of the flywheel 10 through the spline portion 35 of the urging member 30, and the input shaft 20 is splined to the flywheel 10.

When the input shaft 20 is spline-fitted to the flywheel 10, the release operation portion 22 of the input shaft 20 abuts against the temporary fastening body portion 41 of the temporary fastening member 40, and as the input shaft 20 moves in the other axial direction, the release operation portion 22 moves the temporary fastening member 40 in the other axial direction, and the temporary fastening portion 42 moves in the other axial direction.

When the temporary fastening portion 42 is moved to the other axial side, a biasing force F1 acts on one side of the rotational direction from the temporarily fastened portion 36 of the biasing member 30 to the abutting portion 44 of the temporary fastening portion 42 due to the spring portion 33 of the biasing member 30 in a compressed state. The temporary fastening portion 42 is pressed by the biasing force F1 with a pressing force F2 in a direction perpendicular to the inclined surface portion of the abutting portion 44 at the contact portion between the temporarily fastened portion 36 and the abutting portion 44.

The pressing force F2 is decomposed into an axial pressing force F2a and a rotational pressing force F2b, and the temporary fastening portion 42 is pressed in the axial direction by the axial pressing force F2a. The pressing force F2a is expressed as F1·tanθ1 at the first contact portion 44a, and as F1·tanθ2 at the second contact portion 44b.

The inclined surface portion 44 formed on the abutment portion 44 converts the biasing force F1 from the spring portion 33 of the biasing member 30 into a force F2a in a direction that releases the temporary fastening of the biasing member 30 to the flywheel 10. The inclined surface portion 44 formed on the abutment portion 44 inclines toward one side in the rotational direction as it approaches one side in the axial direction, forming an assist mechanism that assists the release operation portion 22 of the input shaft 20 in releasing the temporary fastening of the biasing member 30.

Figure 14 is another explanatory diagram for explaining the operation of releasing the temporary fastening of the urging member to the flywheel. As shown in Figure 14, when the release operation unit 22 moves the temporary fastening main body unit 41 and the temporary fastening unit 42 to the other axial direction of the input shaft 20 until the temporarily fastened unit 36 is positioned within the recess 45 without contacting the recess 45, the release operation unit 22 releases the temporary fastening of the urging member 30 to the flywheel 10, and the input shaft 20 is assembled to the flywheel 10 by spline fitting.

When the input shaft 20 is moved to the other axial direction until the provisionally fixed portion 36 is positioned within the recess 45, the spring portion 33 of the biasing member 30 causes the inner annular portion 32 to move to one side in the rotational direction relative to the outer annular portion 31, and the biasing member 30 is engaged with the flywheel 10, and in the first compressed state of the spring portion 33, the spline portion 35 engages with the spline portion 21 of the input shaft 20, biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

Figure 15 is a diagram showing a splined engagement portion where an input shaft is urged against a flywheel by an urging member. As shown in Figure 15, in the splined engagement portion where the splined portion 12 of the flywheel 10 and the splined portion 21 of the input shaft 20 are splined, the input shaft 20 is urged in one direction of rotation by the urging member 30, the other side of the rotational direction of the teeth 21a of the splined portion 21 of the input shaft 20 is engaged in one direction of rotation of the teeth 35a of the splined portion 35 of the urging member 30, and the one side of the rotational direction of the teeth 21a of the splined portion 21 of the input shaft 20 is engaged in the other direction of rotation of the teeth 12a of the splined portion 12 of the flywheel 10.

In this way, the power transmission device 6 uses a biasing member 30 that biases the input shaft 20 in the rotational direction relative to the flywheel 10 and a temporary fastening member 40 that temporarily fastens the biasing member 30 to the flywheel 10, and the biasing member 30 biases the input shaft 20 in one direction relative to the flywheel 10, thereby suppressing the teeth rattle noise at the spline engagement between the flywheel 10 and the input shaft 20.

In the power transmission device 6, the biasing member 30 is attached to the flywheel 10 by engaging it, the temporary fastening member 40 is attached to the flywheel 10 and the biasing member 30 to temporarily fasten the biasing member 30 to the flywheel 10 in the compressed state of the spring portion 33, and the input shaft 20 is spline-fitted to the flywheel 10 for assembly, so that the input shaft 20 can be spline-fitted and assembled to the flywheel 10 with good assembly properties. When assembling the input shaft 20 attached to the automatic transmission 3 to the flywheel 10 attached to the output shaft 4 of the engine 2, they can be spline-fitted and assembled with good assembly properties.

In this embodiment, the input shaft 20 is biased in one direction relative to the flywheel 10 by the biasing member 30, but the input shaft 20 may be biased in the other direction relative to the flywheel 10 by the biasing member 30. The engaged portion 13 and the restricting portion 14 formed on the flywheel 10 are formed to penetrate the flywheel 10, but they may be openings formed to be recessed from one axial side to the other axial side without penetrating the flywheel 10. The contact portion 44 of the temporary fastening portion 42 has a first contact portion 44a and a second contact portion 44b, but may be formed only by the first contact portion 44a.

In this embodiment, the engaging portion 34, the spring portion 33, and the temporarily fixed portion 36 of the urging member 30 are provided in three pieces at approximately equal intervals in the circumferential direction of the urging member 30, but it is also possible to provide a plurality of such portions, such as two or four, at approximately equal intervals in the circumferential direction of the urging member 30. Even in such a case, the engaged portion 13 and the restricting portion 14 of the flywheel 10, and the temporarily fixed portion 42 of the temporarily fixed member 40 are provided according to the engaging portion 34 and the temporarily fixed portion 36 of the urging member 30.

In this embodiment, the biasing member 30 has a spring portion 33 that is compressible in the rotational direction, and is formed so as to bias the input shaft 20 in one direction in the rotational direction relative to the flywheel 10 when the spring portion 33 is in a first compressed state, and the temporary fastening member 40 is formed so as to temporarily fasten the biasing member 30 to the flywheel 10 when the spring portion 33 is in a second compressed state in which it is more compressed than the first compressed state, and the spring portion 33 is configured so as to be elastically displaceable in the compression direction in the rotational direction, but it is also possible to configure it so as to be elastically displaceable in the tension direction in the rotational direction.

The biasing member 30 has a spring portion that can be pulled in the rotational direction, and is formed so that the spring portion is in a first tension state to bias the input shaft 20 in one direction of rotation relative to the flywheel 10, and the temporary fastening member 40 can also be formed so that the biasing member 30 is temporarily fastened to the flywheel 10 in a second tension state in which the spring portion is pulled further than in the first tension state.

In this case, the spring portion is pulled in the rotational direction by the inner annular portion 32 moving in the other direction relative to the outer annular portion 31, and the release operation portion 22 provided on one axial side of the spline portion 21 of the input shaft 20 is configured to release the temporary fastening of the urging member 30 to the flywheel 10 by the temporary fastening portion of the temporary fastening member 40 so that when the spline portion 21 of the input shaft 20 is spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 35 of the urging member 30 in the first tension state, the spline portion 35 of the urging member 30 engages with the spline portion 21 of the input shaft 20 to urge the input shaft 20 to one direction relative to the flywheel 10.

In this way, in the power transmission device 6 according to this embodiment, when the first and second power transmission members 10, 20 are assembled by spline fitting, the biasing member 30 is engaged with the first power transmission member 10 and the spline portion 35 is engaged with the spline portion 21 of the second power transmission member 20 in the first elastic displacement state of the spring portion 33 to bias the second power transmission member 20 in one rotational direction relative to the first power transmission member 10, and the temporary fastening member 40 has a temporary fastening portion 42 that temporarily fastens the biasing member 30 to the first power transmission member 10 in the second elastic displacement state in which the spring portion 33 is elastically displaced from the first elastic displacement state. A release operation portion 22 is provided on one axial side of the spline portion 21 of the second power transmission member 20 to release the temporary fastening of the biasing member 30 to the first power transmission member 10 by the temporary fastening portion 42.

As a result, the biasing member 30 is attached by engaging it with the first power transmission member 10, the temporary fastening member 40 is attached to the first power transmission member 10 and the biasing member 30 to temporarily fasten the biasing member 30 to the first power transmission member 10 in the second elastically displaced state of the spring portion 33, and the spline portion 21 of the second power transmission member 20 is spline-fitted to the spline portion 12 of the first power transmission member 10 through the spline portion 35 of the biasing member 30 to assemble the second power transmission member 20 to the first power transmission member 10. This releases the temporary fastening of the biasing member 30 to the first power transmission member 10 by the temporary fastening portion 42 of the temporary fastening member 40, and biases the second power transmission member 20 to one side in the rotational direction relative to the first power transmission member 10, thereby suppressing the teeth rattle noise of the spline fitting portions of the first and second power transmission members 10, 20.

By engaging the biasing member 30 with the first power transmission member 10, temporarily fixing the biasing member 30 to the first power transmission member 10 with the temporary fixing member 40, and spline-fitting the second power transmission member 20 to the first power transmission member 10 without changing the shape of the splined portions 12, 21 of the first and second power transmission members 10, 20, the second power transmission member 20 can be biased to one side in the rotational direction relative to the first power transmission member 10, making assembly relatively easy. Therefore, with a relatively simple configuration, it is possible to suppress the rattle noise of the splined fitting portions of the first and second power transmission members 10, 20 with good assembly properties.

The biasing member 30 also includes a spring portion 33, a locking portion 34, a spline portion 35, an inner annular portion 32, an outer annular portion 31, and a temporarily fixed portion 36 that is temporarily fixed to the temporary fixing portion 42. The locking portion 34 is connected to the outer annular portion 31, and the spline portion 35 and the temporarily fixed portion 36 are connected to the inner annular portion 32. One end of the spring portion 33 is connected to the outer annular portion 31 and the other end of the spring portion 33 is connected to the inner annular portion 32. The inner annular portion 32 is moved in the other direction of the rotation relative to the outer annular portion 31, and is elastically displaced in the rotational direction.

As a result, a biasing member 30 is used that has a spring portion 33 that is elastically displaced in the rotational direction when the inner annular portion 32 is moved in the other direction relative to the outer annular portion 31. This eliminates the need to use a spring retaining member to retain the spring, as is the case when a spring is used as the biasing member 30, thereby improving ease of assembly.

The temporary fastening member 40 includes a temporary fastening body 41 through which the spline portion 21 of the second power transmission member 20 is inserted, and a temporary fastening portion 42 extending from the temporary fastening body 41 to the other axial direction. The temporary fastening portion 42 has a restricted portion 43 that is restricted by the first power transmission member 10 on one side in the rotational direction, and has an abutting portion 44 that abuts against the temporarily fastened portion 36 on the other side in the rotational direction, and a recess 45 that is recessed in one rotational direction on one axial side of the abutting portion 44. The recess 45 is formed so that when the release operation portion 22 releases the temporary fastening of the biasing member 30 to the first power transmission member 10, the release operation portion 22 of the second power transmission member 20 moves the temporary fastening body 41 and the temporary fastening portion 42 to the other axial direction, and the temporarily fastened portion 36 is positioned within the recess 45.

As a result, a recess 45 is provided on the other rotational side of the temporary fastening portion 42 of the temporary fastening member 40 and on one axial side of the abutting portion 44, so that when the temporary fastening of the biasing member 30 to the first power transmission member 10 is released, the temporarily fastened portion 36 can be positioned within the recess 45, thereby releasing the temporary fastening of the biasing member 30 to the first power transmission member 10.

It also has an assist mechanism 44 that assists the release operation of the release operation unit 22 in releasing the temporary fastening of the biasing member 30.

As a result, the assist mechanism 44 assists the release operation of the release operation unit 22 in releasing the temporary fastening of the biasing member 30, making it relatively easy to release the temporary fastening of the biasing member 30 and improving the ease of assembly of the second power transmission member 20 to the first power transmission member 10.

The biasing member 30 also has a temporarily fixed portion 36 that is temporarily fixed to the temporary fixing portion 42, and the temporarily fixed portion 42 has a regulated portion 43 that is regulated by the first power transmission member 10 on one side in the rotational direction, and an abutting portion 44 that abuts against the temporarily fixed portion 36 on the other side in the rotational direction, and the abutting portion 44 is formed by an inclined surface portion 44 that inclines toward one side in the rotational direction as it approaches one side in the axial direction, and the assist mechanism is constituted by the inclined surface portion 44.

As a result, the inclined surface portion 44 formed on the abutment portion 44 of the temporary fastening portion 42 constituting the assist mechanism 44 is inclined to one side in the rotational direction as it approaches one side in the axial direction, so that the biasing force F1 applied to the abutment portion 44 of the temporary fastening portion 42 by the spring portion 33 of the biasing member 30 from the temporarily fastened portion 36 of the biasing member 30 to one side in the rotational direction can be converted into a force F2a in a direction that releases the temporary fastening of the biasing member 30 to the first power transmission member 10. This makes it possible to reduce the operating force required to release the temporary fastening of the biasing member 30, improving ease of assembly.

The first power transmission member 10 is a flywheel 10 connected to the output shaft 4 of the engine 2, and the second power transmission member 20 is the input shaft 20 of the transmission 3.

As a result, in a power transmission device 6 having a flywheel 10 and an input shaft 20 of a transmission 3 that are assembled through spline engagement, it is possible to suppress rattle noise at the spline engagement portion of the flywheel 10 and the input shaft 20 of the transmission 3 with ease of assembly using a relatively simple configuration.

Figure 16 is a perspective view of a power transmission device according to a second embodiment of the present invention, Figure 17 is an exploded perspective view of the power transmission device, Figure 18 is a front view of the biasing member, Figure 19 is a front view of the biasing member and the temporary fastening member, and Figure 20 is a perspective view of the biasing member and the temporary fastening member. As with the power transmission device 6 according to the first embodiment, the power transmission device 106 according to the second embodiment includes a biasing member 130 and a temporary fastening member 140 arranged between the flywheel 10 and the input shaft 20, as shown in Figures 16 to 20.

The biasing member 130 is disposed on one axial side of the flywheel 10, which is the side opposite the engine, the temporary fastening member 140 is disposed on one axial side of the biasing member 130, and the input shaft 20 is disposed on one axial side of the temporary fastening member 140. The biasing member 130 and the temporary fastening member 140 are each formed in a substantially flat plate shape in a radial direction substantially perpendicular to the axial directions of the flywheel 10 and the input shaft 20. In this embodiment, the temporary fastening member 140 is divided into multiple parts, specifically three parts, at equal intervals in the circumferential direction.

As shown in FIG. 17, the flywheel 10 has a protrusion 11 on the radial center side, and a spline portion 12 is formed in the radial center. The flywheel 10 has a first opening 13 as a locked portion 13 to which the urging member 130 is locked, and in this embodiment, the first opening 13 is formed as a screw hole. A plurality of first openings 13, specifically three, are formed at equal intervals in the circumferential direction, which is the rotation direction of the flywheel 10. The flywheel 10 also has a second opening 15 formed to avoid interference with the temporary fastening member 140. The second openings 15 are formed in a circular shape, and a plurality of second openings 15, specifically six, are formed at equal intervals in the circumferential direction of the flywheel 10.

As shown in Figures 17 and 18, the biasing member 130 is formed in a circular ring shape extending in a plate shape in a direction perpendicular to the axial direction. The biasing member 130 includes an inner annular portion 132 arranged radially inward and formed in a circular ring shape, and an outer annular portion 131 arranged radially outward and formed in a circular ring shape, and the outer annular portion 131 is arranged concentrically radially outward from the inner annular portion 132.

The biasing member 130 also includes a spring portion 133 that can be compressed in the rotational direction, a locking portion 134 that is locked to the flywheel 10, a spline portion 135 that is spline-fitted to the input shaft 20, and a temporarily fixed portion 136 that is temporarily fixed to the temporary fixing member 140. The spline portion 135 is formed on the inner peripheral surface of the inner annular portion 132 and is connected to the inner annular portion 132.

The spring portion 133 of the biasing member 130 includes a first radial extension portion 133a extending radially outward in a straight line from the inner annular portion 132, a second radial extension portion 133b extending radially inward from the outer annular portion 131 in a straight line substantially parallel to the first radial extension portion 133a, a third radial extension portion 133c extending radially in a straight line substantially parallel between the first and second radial extension portions 133a, 133b, an outer connecting portion 133d extending in an arc shape connecting the radially outer sides of the first and third radial extension portions 133a, 133c, and an inner connecting portion 133e extending in an arc shape connecting the radially inner sides of the third and second radial extension portions 133c, 133b.

The spring portion 133 has one end connected to the outer annular portion 131 and the other end connected to the inner annular portion 132, and is formed in a generally S-shape when viewed from one axial side. The spring portion 133 is configured to be compressible in the rotational direction by moving the first radial extension portion 133a in the other rotational direction relative to the second radial extension portion 133b as a result of the inner annular portion 132 moving in the other rotational direction relative to the outer annular portion 131.

The locking portion 134 of the biasing member 130 is composed of a tip portion 137a of a first arm portion 137 that extends radially inward from the outer annular portion 131 on the other side of the rotational direction of the spring portion 133, and a fastening bolt B1 (see FIG. 17) that is inserted from one axial side into a bolt insertion hole 137b provided in the tip portion 137a. The biasing member 130 is locked and fixed to the flywheel 10 by screwing the fastening bolt B1 into the first opening 13 of the flywheel 10.

The temporarily fixed portion 136 of the biasing member 130 is provided on the tip side of the second arm portion 138 that extends radially outward in a substantially straight line from the inner annular portion 132 on one side in the rotational direction of the spring portion 133. The temporarily fixed portion 136 of the biasing member 130 is formed on the end face on one side in the rotational direction of the second arm portion 138, recessed toward the other side in the rotational direction.

The spring portion 133, the locking portion 134, and the temporarily fixed portion 136 are each formed in multiples, specifically three, at equal intervals around the circumference of the biasing member 130. Each spring portion 133 is disposed between the locking portion 134, which is disposed on the other side in the rotational direction, and the temporarily fixed portion 136, which is disposed on one side in the rotational direction.

The biasing member 130 is engaged with the flywheel 10, and in a first compression state of the spring portion 133 in which the inner annular portion 132 is moved to the other side in the rotational direction relative to the outer annular portion 131, the spline portion 135 engages with the spline portion 21 of the input shaft 20, biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

In this embodiment, as shown in FIG. 17, the temporary fastening member 140 is composed of three temporary fastening members 140 arranged at equal intervals in the circumferential direction. The temporary fastening member 140 is formed of a plate-shaped member, and as shown in FIG. 19 and FIG. 20, includes a fixing portion 141 fixed to the urging member 130, a temporary fastening portion 142 that temporarily fastens the urging member 130 to the flywheel 10, a temporary fastening main body portion 143 that connects the fixing portion 141 and the temporary fastening portion 142 and extends radially in a direction approximately perpendicular to the axial direction, and a radial extension portion 144 that extends radially inward from one circumferential side of the temporary fastening main body portion 143 from the temporary fastening portion 142. The temporary fastening main body portion 143 functions as a connection portion that connects the fixing portion 141 and the temporary fastening portion 142.

The fixing portion 141 is provided radially outward of the temporary fastening main body portion 143, disposed along one axial side of the outer annular portion 131 of the biasing member 130, and fixed to the outer annular portion 131 by welding or the like. The fixing portion 141 also has a hook portion 141a (see FIG. 22) that is folded back in an inverted U-shape from one axial side of the outer annular portion 131 through the radially outward side to the radially inward side, and is fixed to the outer annular portion 131 with the hook portion 141a fitted into the radially outward side of the outer annular portion 131. Note that the hook portion 141a may not be provided on the fixing portion 141.

The temporary fastening member 140 is configured such that the fixing portion 141 is fixed to the biasing member 130, so that the radially inner side of the temporary fastening main body portion 143 can be elastically displaced in one axial direction relative to the fixing portion 141, and the temporary fastening portion 142 and the radial extension portion 144 can be elastically displaced in one axial direction.

The temporary fastening portion 142 is provided radially inward of the temporary fastening body portion 143 and extends to the other axial side, and is formed to temporarily fasten the urging member 130 to the flywheel 10 when the spring portion 133 of the urging member 130 is in a second compressed state, which is compressed from the first compressed state. In this embodiment, the temporary fastening portion 142 is fixed to the urging member 130 engaged and fixed to the flywheel 10, thereby temporarily fastening the urging member 130 to the flywheel 10. The temporary fastening portion 142 is formed to correspond to the second opening 15 so as to avoid interference with the flywheel 10.

Figure 21 is an enlarged view of the temporary fastening portion of the temporary fastening member shown in Figure 20 and its vicinity, and Figure 22 is a cross-sectional view of the urging member and temporary fastening member taken along line Y22-Y22 in Figure 21. As shown in Figures 21 and 22, the temporary fastening portion 142 has, on the other side in the rotational direction, a contact portion 145 that contacts the temporarily fastened portion 136 of the urging member 130, and a recess 146 that is recessed in one direction in the rotational direction on one axial side of the contact portion 145.

The abutment portion 145 is formed by the end face on the other side in the rotational direction of the temporary fastening portion 142, which extends linearly at a predetermined angle relative to the axial direction. The abutment portion 145 is formed by an inclined surface portion that inclines at a predetermined angle θ3 toward one side in the rotational direction as it approaches one side in the axial direction. The predetermined angle θ3 is set to an angle between 5 degrees and 15 degrees, for example.

The recess 146 of the temporary fastening portion 142 is formed by the end face on the other side of the temporary fastening portion 142 in the rotational direction, and is recessed in a substantially rectangular shape on one side in the rotational direction. The recess 146 is formed so that the temporarily fastened portion 136 of the biasing member 130 is positioned within the recess 146 without abutting against the recess 146 when the input shaft 20 is spline-fitted to the flywheel 10.

The radial extension portion 144 of the temporary fastening member 140 extends radially inward from the other rotational direction side of the temporary fastening main body portion 143 relative to the temporary fastening portion 142. When the radially inner side of the temporary fastening main body portion 143 is elastically displaced axially to one side relative to the fixing portion 141, the radial extension portion 144 is elastically displaced axially to one side relative to the fixing portion 141 relative to the temporary fastening main body portion 143.

When the radial extension portion 144 of the temporary fastening member 140 is elastically displaced in one axial direction, the radial inner side of the temporary fastening main body portion 143 is elastically displaced in one axial direction, and the abutting portion 145 abuts against the temporarily fastened portion 136 of the biasing member 130, temporarily fastening the biasing member 130 in a second compressed state in which the spring portion 133 of the biasing member 130 is compressed more than in the first compressed state.

Figure 23 is a diagram showing a state in which the urging member is temporarily fixed by the temporary fixing member. As shown in Figure 23, when the radial inner side of the temporary fixing main body part 143 of the temporary fixing member 140 is elastically displaced in one axial direction by an operator or the like with the fixing part 141 fixed to the urging member 130, the temporary fixing part 142 moves in one axial direction and the abutting part 145 of the temporary fixing part 142 abuts against the temporarily fixed part 136 of the urging member 130, and the spring part 133 of the urging member 130 is temporarily fixed in a second compressed state compressed from the first compressed state.

As in the first embodiment, the abutment portion 145 may be provided with a first inclined surface portion as a first abutment portion provided on one axial side and extending linearly at a first predetermined angle relative to the axial direction, and a second inclined surface portion as a second abutment portion provided on the other axial side and extending linearly at a second predetermined angle larger than the first predetermined angle relative to the axial direction, and the first predetermined angle may be set to an angle between 5 degrees and 15 degrees, for example, and the second predetermined angle may be set to an angle between 30 degrees and 45 degrees, for example.

As shown in FIG. 17, the input shaft 20 has a spline portion 21 on the outer circumferential surface on the other axial side. The spline portion 21 has splines whose teeth extend in the axial direction, and is formed to be spline-fitted with the spline portion 12 of the flywheel 10 and the spline portion 135 of the biasing member 130.

The input shaft 20 is also provided with a release operation portion 22 on one axial side of the spline portion 21, which releases the temporary fastening of the biasing member 130 to the flywheel 10 by the temporary fastening portion 142 of the temporary fastening member 140. The release operation portion 22 is formed in a circular shape and is formed radially outwardly larger than the radially inner end of the radial extension portion 144 of the temporary fastening member 140.

The release operation section 22 is formed so that when the spline section 21 of the input shaft 20 is inserted through the radial center side of the temporary fastening member 140 from one axial side of the temporary fastening member 140 and spline-fitted to the spline section 12 of the flywheel 10 through the spline section 135 of the biasing member 130, in the first compressed state of the spring section 133, the spline section 135 of the biasing member 130 engages with the spline section 21 of the input shaft 20 to bias the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

In the power transmission device 106, the biasing member 130 is attached to the flywheel 10 by engaging it from one axial side, and the temporary fixing member 140 is attached to the biasing member 130 from one axial side, and the biasing member 130 is temporarily fixed to the flywheel 10 in the second compressed state of the spring portion 133. After that, the input shaft 20 is spline-fitted from one axial side, with the spline portion 21 of the input shaft 20 splined to the spline portion 12 of the flywheel 10 through the spline portion 135 of the biasing member 130, and the input shaft 20 is spline-fitted to the flywheel 10 and assembled.

Figure 24 shows the state in which the urging member and temporary fastening member are attached to the flywheel. When assembling the input shaft 20 to the flywheel 10 by spline fitting, as shown in Figure 24, the urging member 130 is attached to the flywheel 10 by engaging the locking portion 134 of the urging member 130 with the fastening bolt B1. The urging member 130 is attached so that the spline portion 135 approximately matches the spline portion 12 of the flywheel 10.

A temporary fastening member 140 is disposed on one axial side of the urging member 130, and the hook portion 141a of the temporary fastening member 140 is fitted into the outer annular portion 131 of the urging member 130, and the fixed portion 141 of the temporary fastening member 140 is fixed to the outer annular portion 131 by welding or the like with the temporarily fastened portion 136 of the urging member 130 disposed in the recess 146 of the temporary fastening member 140, thereby attaching the temporary fastening member 140.

The temporary fixing member 140 attached to the biasing member 130 moves the temporarily fixed portion 136 of the biasing member 130 to the other side in the rotational direction, compressing the spring portion 133 of the biasing member 130, elastically displacing the radial extension portion 144 to one axial side, and with the spring portion 133 of the biasing member 130 compressed to the second compressed state, the temporarily fixed portion 136 of the biasing member 130 abuts against the abutment portion 145 of the temporary fixing portion 142, thereby temporarily fixing the biasing member 130.

Figure 25 is an explanatory diagram for explaining the assembly of the input shaft to the flywheel. Next, as shown in Figure 25, the input shaft 20 is assembled from one axial side so that the spline portion 21 is spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 135 of the biasing member 130.

When the input shaft 20 is spline-fitted to the flywheel 10, the release operation portion 22 of the input shaft 20 abuts against the radial extension portion 144 of the temporary fastening member 140, and as the input shaft 20 moves to the other axial side, the release operation portion 22 moves the radial inner side of the temporary fastening body portion 143 of the temporary fastening member 140 to the other axial side, and the temporary fastening portion 142 moves to the other axial side.

As shown in FIG. 23, when the temporary fastening portion 142 is moved to the other axial side, a biasing force F1 acts on one side of the rotational direction from the temporarily fastened portion 136 of the biasing member 130 to the abutting portion 145 of the temporary fastening portion 142 due to the spring portion 133 of the biasing member 130 in a compressed state. The temporary fastening portion 142 is pressed by the biasing force F1 with a pressing force F2 in a direction perpendicular to the inclined surface portion of the abutting portion 145 at the contact portion between the temporarily fastened portion 136 and the abutting portion 145.

The inclined surface portion 145 formed on the abutment portion 145 converts the biasing force F1 from the spring portion 133 of the biasing member 130 into a force F2a in a direction that releases the temporary fastening of the biasing member 130 to the flywheel 10. The inclined surface portion 145 formed on the abutment portion 145 inclines toward one side in the rotational direction as it approaches one side in the axial direction, forming an assist mechanism that assists the release operation portion 22 of the input shaft 20 in releasing the temporary fastening of the biasing member 130.

When the release operation unit 22 moves the temporary fastening portion 142 to the other axial direction until the temporarily fastened portion 136 is positioned within the recess 146 without contacting the recess 146, the release operation unit 22 releases the temporary fastening of the biasing member 130 to the flywheel 10, and the input shaft 20 is assembled to the flywheel 10 by spline fitting.

When the input shaft 20 is moved to the other axial direction until the provisionally fixed portion 136 is positioned within the recess 146, the spring portion 133 of the biasing member 130 causes the inner annular portion 132 to move to one side in the rotational direction relative to the outer annular portion 131, and the biasing member 130 is engaged with the flywheel 10 and, in the first compressed state of the spring portion 133, the spline portion 135 engages with the spline portion 21 of the input shaft 20, biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

For the power transmission device 106, at the spline engagement portion where the spline portion 12 of the flywheel 10 and the spline portion 21 of the input shaft 20 are spline-engaged, the input shaft 20 is urged in one direction of rotation by the urging member 130, the other side of the teeth of the spline portion 21 of the input shaft 20 is engaged in one direction of rotation of the teeth of the spline portion 135 of the urging member 130, and the one side of the teeth of the spline portion 21 of the input shaft 20 is engaged in the other direction of rotation of the teeth of the spline portion 12 of the flywheel 10.

In this way, the power transmission device 106 also uses a biasing member 130 that biases the input shaft 20 in the rotational direction relative to the flywheel 10, and a temporary fastening member 140 that temporarily fastens the biasing member 130 to the flywheel 10, and the biasing member 130 biases the input shaft 20 in one direction relative to the flywheel 10, thereby suppressing the teeth rattle noise at the spline engagement between the flywheel 10 and the input shaft 20.

For the power transmission device 106, the biasing member 130 is attached to the flywheel 10 by engaging it with it, the temporary fastening member 140 is attached to the flywheel 10 and the biasing member 130, the biasing member 130 is temporarily fastened to the flywheel 10 with the spring portion 133 in a compressed state, and the input shaft 20 is spline-fitted to the flywheel 10 for assembly, allowing the input shaft 20 to be spline-fitted to the flywheel 10 for easy assembly.

In the power transmission device 106, the temporary fastening member 140 may be fixed to the biasing member 130 before the biasing member 130 is engaged and attached to the flywheel 10, or may be fixed to the biasing member 130 after the biasing member 130 is engaged and attached to the flywheel 10.

In this embodiment, the biasing member 130 is configured to bias the input shaft 20 in one direction relative to the flywheel 10 in the rotational direction, but the biasing member 130 may also bias the input shaft 20 in the other direction relative to the flywheel 10.

The biasing member 130 has a spring portion 133 that can be compressed in the rotational direction, and is formed so that when the spring portion 133 is in a first compressed state, it biases the input shaft 20 in one direction relative to the flywheel 10 in the rotational direction. The temporary fastening member 140 is formed so that the biasing member 130 is temporarily fastened to the flywheel 10 when the spring portion 133 is in a second compressed state in which it is more compressed than the first compressed state. The spring portion 133 is configured so that it can be elastically displaced in the compression direction in the rotational direction, but it can also be configured so that it can be elastically displaced in the tension direction in the rotational direction.

In this way, in the power transmission device 106 according to this embodiment, when the first and second power transmission members 10, 20 are assembled by spline fitting, the biasing member 130 is engaged with the first power transmission member 10 and the spline portion 135 is engaged with the spline portion 21 of the second power transmission member 20 in the first elastic displacement state of the spring portion 133 to bias the second power transmission member 20 in one rotational direction relative to the first power transmission member 10, and the temporary fastening member 140 has a temporary fastening portion 142 that temporarily fastens the biasing member 130 to the first power transmission member 10 in the second elastic displacement state in which the spring portion 133 is elastically displaced from the first elastic displacement state. A release operation portion 22 is provided on one axial side of the spline portion 21 of the second power transmission member 20 to release the temporary fastening of the biasing member 130 to the first power transmission member 10 by the temporary fastening portion 142.

As a result, the biasing member 130 is attached by engaging it with the first power transmission member 10, the temporary fastening member 140 is attached to the first power transmission member 10 and the biasing member 30, the biasing member 130 is temporarily fastened to the first power transmission member 10 in the second elastic displacement state of the spring portion 133, and the spline portion 21 of the second power transmission member 20 is spline-fitted to the spline portion 12 of the first power transmission member 10 through the spline portion 135 of the biasing member 130 to assemble the second power transmission member 20 to the first power transmission member 10. This releases the temporary fastening of the biasing member 130 to the first power transmission member 10 by the temporary fastening portion 142 of the temporary fastening member 140, and biases the second power transmission member 20 to one side in the rotational direction relative to the first power transmission member 10, thereby suppressing the teeth rattle noise of the spline fitting portions of the first and second power transmission members 10, 20.

Without changing the shape of the splined portions 12, 21 of the first and second power transmission members 10, 20, the biasing member 130 is engaged with the first power transmission member 10, the biasing member 130 is temporarily fixed to the first power transmission member 10 by the temporary fixing member 140, and the second power transmission member 20 is spline-fitted to the first power transmission member 10, so that the second power transmission member 20 can be biased to one side in the rotational direction relative to the first power transmission member 10, and assembly can be performed relatively easily. Therefore, with a relatively simple configuration, it is possible to suppress the rattle noise of the spline-fitted portions of the first and second power transmission members 10, 20 with good assembly properties.

The biasing member 130 also includes a spring portion 133, a locking portion 134, a spline portion 135, an inner annular portion 132, an outer annular portion 131, and a temporarily fixed portion 136 that is temporarily fixed to the temporary fixing portion 142. The locking portion 134 is connected to the outer annular portion 131, and the spline portion 135 and the temporarily fixed portion 136 are connected to the inner annular portion 132. One end of the spring portion 133 is connected to the outer annular portion 131 and the other end of the spring portion 133 is connected to the inner annular portion 132. The inner annular portion 132 is moved in the other direction in the rotational direction relative to the outer annular portion 131, and is elastically displaced in the rotational direction.

As a result, a biasing member 130 is used that has a spring portion 133 that is elastically displaced in the rotational direction when the inner annular portion 132 is moved in the other direction relative to the outer annular portion 131. This eliminates the need to use a spring retaining member to retain the spring, as is the case when a spring is used as the biasing member 130, thereby improving ease of assembly.

The temporary fastening member 140 is fixedly attached to the outer annular portion 131 of the biasing member 130. This makes it possible to suppress circumferential rattle of the temporary fastening member 140 when the first and second power transmission members 10, 20 are spline-fitted and assembled.

In addition, multiple temporary fastening members 140 are attached to the biasing member 130 at equal intervals in the circumferential direction. This makes it possible to effectively suppress rattle noise at the spline engagement portions of the first and second power transmission members 10, 20 by using multiple temporary fastening members 140 attached to the biasing member 130 at equal intervals in the circumferential direction.

The device also includes an assist mechanism 145 that assists the release operation unit 22 in releasing the temporary fastening of the biasing member 130. As a result, the assist mechanism 145 assists the release operation unit 22 in releasing the temporary fastening of the biasing member 130, making it relatively easy to release the temporary fastening of the biasing member 130 and improving the ease of assembly of the second power transmission member 20 to the first power transmission member 10.

The biasing member 130 also includes a temporarily fixed portion 136 that is temporarily fixed to the temporarily fixed portion 142, and the temporarily fixed portion 142 has an abutment portion 145 that abuts against the temporarily fixed portion 136 on the other side in the rotational direction, and the abutment portion 145 is formed by an inclined surface portion 145 that inclines toward one side in the rotational direction as it approaches one side in the axial direction, and the assist mechanism 145 is formed by the inclined surface portion 145.

As a result, the inclined surface portion 145 formed on the abutment portion 145 of the temporary fastening portion 142 constituting the assist mechanism 145 is inclined to one side in the rotational direction as it approaches one side in the axial direction, so that the biasing force applied to the abutment portion 145 of the temporary fastening portion 142 by the spring portion 133 of the biasing member 130 from the temporarily fastened portion 136 of the biasing member 130 to one side in the rotational direction can be converted into a force in a direction that releases the temporary fastening of the biasing member 130 to the first power transmission member 10, thereby reducing the operating force required to release the temporary fastening of the biasing member 130 and improving assembly.

Figure 26 is a diagram showing a modified example of the biasing member according to the second embodiment. As shown in Figure 26, the spring portion of the biasing member 130 may be a spring portion 133' in which one end side of the spring portion 133' is connected to the outer annular portion 131 by connecting the second radial extension portion 133b' of the spring portion 133' to a first arm portion 137 extending radially inward from the outer annular portion 131.

Figure 27 is a diagram showing a modified example of the temporary fastening member according to the second embodiment. The temporary fastening member 140' shown in Figure 27, like the temporary fastening member 140, includes a fixed portion 141 fixed to the biasing member 130, a temporary fastening portion 142 that temporarily fastens the biasing member 130 to the flywheel 10, a temporary fastening main body portion 143 that connects the fixed portion 141 and the temporary fastening portion 142 and extends radially in a direction approximately perpendicular to the axial direction, and a radial extension portion 144 that extends radially inward from one circumferential side of the temporary fastening main body portion 143 beyond the temporary fastening portion 142.

The fixing portion 141 is also provided radially outward of the temporary fastening body portion 143 and fixed to the outer annular portion 131 by welding or the like, and has a hook portion 141a (see FIG. 28) that is folded back radially inward in an inverted U-shape from one axial side of the outer annular portion 131 through the radially outward direction, and is fixed to the outer annular portion 131 with the hook portion 141a fitted into the radially outward direction of the outer annular portion 131.

In the temporary fastening member 140, the folded portion of the hook portion 141a and the temporary fastening main body portion 143 extend in parallel in the radial direction, but in the temporary fastening member 140', the folded portion of the hook portion 141a and the temporary fastening main body portion 143 are formed so as to open at a predetermined angle θ4. The predetermined angle θ4 is set to, for example, an angle between 5 degrees and 10 degrees.

Figure 28 is an explanatory diagram for explaining the temporary fastening of the biasing member by the temporary fastening member. As shown in Figure 28 (a), in the temporary fastening member 140', the temporary fastening body portion 143 is elastically displaced to the other axial direction so that the folded portion of the hook portion 141a and the temporary fastening body portion 143 are parallel to each other, and the fixing portion 141 is fixed to the biasing member 130 by welding or the like. As a result, the temporary fastening member 140' is configured such that the radial inner side of the temporary fastening body portion 143 can move by elastic force to one axial direction side relative to the fixing portion 141, and the temporary fastening portion 142 and the radial extension portion 144 can move to one axial direction side.

The temporary fastening portion 142 and the radial extension portion 144 can move axially to one side relative to the fixed portion 141 due to the elastic force of the temporary fastening member 140', but the temporarily fastened portion 136 of the biasing member 130 is restricted from moving axially to one side by the side surface on the other axial side of the recess 146 of the temporary fastening member 140'.

As shown in FIG. 28(b), when the temporarily fixed portion 136 of the urging member 130 is moved to the other side in the rotational direction by an operator or the like and the spring portion 133 of the urging member 130 is compressed, the temporary fixing portion 142 and the radial extension portion 144 are moved to one axial side relative to the fixed portion 141 by the elastic force of the temporary fixing member 140', and the temporary fixing portion 142 temporarily fixes the urging member 130 in a second compressed state in which the spring portion 133 of the urging member 130 is compressed more than in the first compressed state.

In this way, the temporary fastening member 140' may have a fixed portion 141 fixed to the biasing member 130, a temporary fastening portion 142, and a connection portion 143 that connects the fixed portion 141 and the temporary fastening portion 142 and fixes the fixed portion 141 to the biasing member 130 with the temporary fastening portion 142 elastically displaced in the other axial direction relative to the fixed portion 141, and may be configured such that the temporary fastening portion 142 moves by elastic force in one axial direction relative to the fixed portion 141 fixed to the biasing member 130, and the temporary fastening portion 142 temporarily fastens the biasing member 130.

Even in such a case, the temporary fastening member 140' is configured so that the temporary fastening portion 142 moves by elastic force in one axial direction relative to the fixing portion 141 fixed to the biasing member 130, so that the temporary fastening portion 142 temporarily fastens the biasing member 130. This can suppress the rattle noise of the spline engagement portion of the first and second power transmission members 10, 20, and can also suppress circumferential rattle of the temporary fastening member 140' when the first and second power transmission members 10, 20 are spline-engaged and assembled.

Figure 29 is a perspective view of a power transmission device according to a third embodiment of the present invention, Figure 30 is an exploded perspective view of the power transmission device, Figure 31 is a front view of the biasing member, Figure 32 is a front view of the biasing member and the temporary fastening member, and Figure 33 is a perspective view of the biasing member and the temporary fastening member. As with the power transmission device 6 according to the first embodiment, the power transmission device 206 according to the third embodiment includes a biasing member 230 and a temporary fastening member 240 arranged between the flywheel 10 and the input shaft 20, as shown in Figures 29 to 33.

The biasing member 230 is disposed on one axial side of the flywheel 10, which is the side opposite the engine, the temporary fastening member 240 is disposed on one axial side of the biasing member 230, and the input shaft 20 is disposed on one axial side of the temporary fastening member 240. The biasing member 230 is formed in a substantially flat plate shape in a radial direction substantially perpendicular to the axial direction of the flywheel 10 and the input shaft 20. In this embodiment, the temporary fastening member 240 is divided into multiple parts, specifically four parts, at equal intervals in the circumferential direction.

As shown in FIG. 30, the flywheel 10 has a protrusion 11 on the radial center side, and a spline portion 12 is formed in the radial center. The flywheel 10 has a first opening 13 as a locked portion 13 to which the urging member 230 is locked, and in this embodiment, the first opening 13 is formed as a screw hole. The first opening 13 is formed in a support portion 16 that extends radially outward from the protrusion 11 of the flywheel 10 and supports the urging member 230. The flywheel 10 has a plurality of support portions 16, specifically four support portions 16, which extend in the circumferential direction, which is the direction of rotation, at equal intervals in the circumferential direction. Each support portion 16 has a first opening 13 formed therein.

As shown in Figures 30 and 31, the biasing member 230 is formed in a circular ring shape extending in a plate-like manner in a direction perpendicular to the axial direction. The biasing member 230 includes an inner annular portion 232 arranged radially inward and formed in a circular ring shape, and an outer annular portion 231 arranged radially outward and formed in a circular ring shape, and the outer annular portion 231 is arranged concentrically radially outward from the inner annular portion 232. The outer annular portion 231 is offset from the inner annular portion 232 to the other axial direction side, and the outer annular portion 231 is provided with a flange portion 231b that extends from the inner peripheral side to one axial direction side in a substantially cylindrical shape to the same axial position as the inner annular portion 232.

The biasing member 230 also includes a spring portion 233 that can be pulled in the rotational direction, a locking portion 234 that is locked to the flywheel 10, a spline portion 235 that is spline-fitted to the input shaft 20, and a temporarily fixed portion 236 that is temporarily fixed to the temporary fixing member 240. The spline portion 235 is formed on the inner peripheral surface of the inner annular portion 232 and is connected to the inner annular portion 232.

The spring portion 233 of the biasing member 230 includes a first radial extension portion 233a extending radially outward in a straight line from the inner annular portion 232, a second radial extension portion 233b extending radially inward from the outer annular portion 231 in a straight line substantially parallel to the first radial extension portion 233a, a third radial extension portion 233c extending radially in a straight line substantially parallel between the first and second radial extension portions 233a, 233b, an outer connecting portion 233d extending in an arc shape connecting the radially outer sides of the first and third radial extension portions 233a, 233c, and an inner connecting portion 233e extending in an arc shape connecting the radially inner sides of the third and second radial extension portions 233c, 233b.

The spring portion 233 has one end connected to the outer annular portion 231 and the other end connected to the inner annular portion 232, and is formed in a generally S-shape when viewed from the other axial direction side. The spring portion 233 is configured so that it can be pulled in the rotational direction by moving the first radial extension portion 233a in the other rotational direction relative to the second radial extension portion 233b as the inner annular portion 232 moves in the other rotational direction relative to the outer annular portion 231.

The locking portion 234 of the biasing member 230 is composed of an outer annular portion 231 and a fastening bolt B2 (see FIG. 30) that is inserted from one axial side into a bolt insertion hole 231a provided in the outer annular portion 231. The biasing member 230 is locked and fixed to the flywheel 10 by screwing the fastening bolt B2 into the first opening 13 of the flywheel 10.

The temporarily fixed portion 236 of the biasing member 230 is provided on the tip side of an arm portion 238 that extends radially outward in a substantially straight line from the inner annular portion 232 on the other side of the rotational direction of the spring portion 233. The arm portion 238 extends radially outward from the inner annular portion 232 in a substantially rectangular cross section, and is formed so that the tip side where the temporarily fixed portion 236 is provided is substantially flush with the outer annular portion 231. The outer annular portion 231 is formed with a notch 231c that is cut out in a substantially rectangular shape from the radially inner side to the radially outer side when viewed from the axial direction, and the temporarily fixed portion 236 and the temporarily fixed portion 242 are arranged within the notch 231c.

The spring portion 233, the locking portion 234, and the temporarily fixed portion 236 are each formed in multiples, specifically four, at equal intervals around the circumference of the biasing member 230. The locking portion 234 is positioned so as to overlap with the spring portion 233 in the rotational direction, and the temporarily fixed portion 236 is positioned on the other side of the spring portion 233 in the rotational direction.

The biasing member 230 is engaged with the flywheel 10, and in a first tension state of the spring portion 233 in which the inner annular portion 232 has been moved to the other side in the rotational direction relative to the outer annular portion 231, the spline portion 235 engages with the spline portion 21 of the input shaft 20, biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

In this embodiment, as shown in FIG. 30, the temporary fastening member 240 is composed of four temporary fastening members 240 arranged at equal intervals in the circumferential direction. The temporary fastening member 240 is formed of a plate-shaped member, and as shown in FIG. 32 and FIG. 33, includes a fixing portion 241 fixed to the biasing member 230, a temporary fastening portion 242 that temporarily fastens the biasing member 230 to the flywheel 10, and a temporary fastening main body portion 243 that connects the fixing portion 241 and the temporary fastening portion 242 and extends in the circumferential direction. The temporary fastening main body portion 243 functions as a connecting portion that connects the fixing portion 241 and the temporary fastening portion 242.

The temporary fastening body 243 is formed in a substantially U-shape and includes a first circumferential extension portion 243a that is disposed on the other axial side and extends in the circumferential direction, a second circumferential extension portion 243b that is disposed on one axial side and extends in the circumferential direction, and a connecting portion 243c that connects one circumferential end side, i.e., one side in the rotational direction, of the first and second circumferential extension portions 243a and 243b and extends in an arc shape.

The fixing portion 241 is provided on the other rotational side of the first circumferential extension portion 243a of the temporary fastening main body portion 243, and is disposed along one axial side of the outer annular portion 231 of the biasing member 230 and fixed to the outer annular portion 131 by welding or the like.

The temporary fastening portion 242 is provided on the other rotational side of the second circumferential extension portion 243b of the temporary fastening main body portion 243. The temporary fastening member 240 is configured such that the other rotational side of the second circumferential extension portion 243b of the temporary fastening main body portion 243 can be elastically displaced in one axial direction relative to the fixed portion 241 by fixing the fixed portion 241 to the biasing member 230, and the temporary fastening portion 242 can be elastically displaced in one axial direction.

The temporary fastening portion 242 extends from the other rotational side of the second circumferential extension portion 243b of the temporary fastening main body portion 243 to the other axial side, and is formed to temporarily fasten the urging member 230 to the flywheel 10 in a second tension state in which the spring portion 233 of the urging member 230 is in a tensioned state from the first tension state. In this embodiment, the temporary fastening portion 242 is fixed to the urging member 230 engaged and fixed to the flywheel 10, so that the temporary fastening portion 242 is temporarily fastened to the flywheel 10. The temporary fastening portion 242 is disposed at a different circumferential position from the support portion 16 formed on the flywheel 10 to avoid interference with the flywheel 10.

Figure 34 is a cross-sectional view of the temporary fastening portion of the temporary fastening member shown in Figure 33 and its vicinity. As shown in Figure 34, the temporary fastening portion 242 has an abutment portion 244 on the other side in the rotational direction that abuts against the temporarily fastened portion 236 of the biasing member 230, and a recess 245 that is recessed on one axial side of the abutment portion 244 toward one side in the rotational direction.

The abutment portion 244 is formed by the end face on the other side of the rotation direction of the temporary fastening portion 242, which extends linearly and approximately parallel to the axial direction. The abutment portion 244 may be formed by an inclined surface portion that inclines toward one side of the rotation direction as it approaches one side of the axial direction, as in the previously described embodiment.

35 is a diagram showing a state in which the urging member is temporarily fixed by the temporary fixing member. As shown in FIG. 35, the recess 245 of the temporary fixing portion 242 is formed by the end face on the other side of the rotation direction of the temporary fixing portion 242, and is formed to be recessed in an approximately trapezoidal shape on one side in the rotation direction. The side surface on one axial side of the recess 245 extends linearly in a direction perpendicular to the axial direction, and the side surface on the other axial side is formed to be inclined toward one axial side as it approaches one side in the rotation direction. The recess 245 is formed so that when the input shaft 20 is spline-fitted to the flywheel 10, the temporarily fixed portion 236 of the urging member 230 is disposed within the recess 245 without abutting against the recess 245. The recess 245 may be formed in an approximately rectangular shape, similar to the temporary fixing member 140.

As shown in FIG. 34, the temporary fastening member 240 is provided with a guide portion 243d on the first circumferential extension portion 243a of the temporary fastening main body portion 243, which extends through the cutout portion 231c to the other axial side of the outer annular portion 231 and then to the other rotational side. The guide portion 243d is disposed on the other axial side of the temporarily fastened portion 236 of the biasing member 230 and guides the temporarily fastened portion 236 to move in the rotational direction. The guide portion 243d of the temporary fastening member 240 is provided radially inward from the temporary fastening portion 242.

As shown in FIG. 35, when the other rotational side of the second circumferential extension portion 243b of the temporary fastening body portion 243 is elastically displaced in one axial direction by an operator or the like relative to the fixing portion 241, the temporary fastening portion 242 is elastically displaced in one axial direction, and the abutting portion 244 abuts against the temporarily fastened portion 236 of the biasing member 230, temporarily fixing the biasing member 230 in a second tension state in which the spring portion 233 of the biasing member 230 is tensioned more than the first tension state.

As shown in FIG. 29, the input shaft 20 has a spline portion 21 on the outer circumferential surface on the other axial side. The spline portion 21 has splines whose teeth extend in the axial direction, and is formed to be spline-fitted with the spline portion 12 of the flywheel 10 and the spline portion 235 of the biasing member 230.

A release operation part 22' is provided on one axial side of the spline part 21 of the input shaft 20 to release the temporary fastening of the biasing member 230 to the flywheel 10 by the temporary fastening part 242 of the temporary fastening member 240. In this embodiment, the release operation part 22' is provided on the transmission case 5 that rotatably supports the input shaft 20, and is formed on a vertical wall part 5a that extends radially inward from the outer periphery of the transmission case 5.

The release operation section 22' is formed so that when the spline section 21 of the input shaft 20 is inserted through the radial center side of the temporary fastening member 240 from one axial side of the temporary fastening member 240 and spline-fitted to the spline section 12 of the flywheel 10 through the spline section 235 of the biasing member 230, in the first tension state of the spring section 233, the spline section 235 of the biasing member 230 engages with the spline section 21 of the input shaft 20 to bias the input shaft 20 to one rotational direction relative to the flywheel 10.

In the power transmission device 206, the biasing member 230 is attached to the flywheel 10 by engaging it from one axial side, and the temporary fixing member 240 is attached to the biasing member 230 from one axial side, and the biasing member 230 is temporarily fixed to the flywheel 10 in the second tension state of the spring portion 233. After that, the input shaft 20 is spline-fitted from one axial side, with the spline portion 21 of the input shaft 20 splined to the spline portion 12 of the flywheel 10 through the spline portion 235 of the biasing member 230, and the input shaft 20 is assembled to the flywheel 10 by being spline-fitted.

Figure 36 shows the state in which the urging member and temporary fastening member are attached to the flywheel. When assembling the input shaft 20 to the flywheel 10 by spline fitting, as shown in Figure 36, the urging member 230 is attached to the flywheel 10 by engaging the locking portion 234 of the urging member 230 with the fastening bolt B2. The urging member 230 is attached so that the spline portion 235 approximately matches the spline portion 12 of the flywheel 10.

The temporary fastening member 240 is disposed on one axial side of the urging member 230, and the first circumferential extension portion 243a of the temporary fastening main body portion 243 is overlapped with the outer annular portion 231, and the temporarily fastened portion 236 of the urging member 230 is disposed in the recess 245 of the temporary fastening member 240. In this state, the fixing portion 241 of the temporary fastening member 240 is fixed to the outer annular portion 131 by welding or the like, and the temporary fastening member 240 is attached.

The temporary fixing member 240 attached to the biasing member 230 moves the temporarily fixed portion 236 of the biasing member 230 to the other side in the rotational direction, tensioning the spring portion 233 of the biasing member 230, elastically displacing the second circumferential extension portion 243b to one side in the axial direction, and with the spring portion 233 of the biasing member 230 tensioned to the second tension state, the temporarily fixed portion 236 of the biasing member 230 abuts against the abutment portion 244 of the temporary fixing portion 242, temporarily fixing the biasing member 230.

Figure 37 is an explanatory diagram for explaining the assembly of the input shaft to the flywheel. Next, as shown in Figure 37, the input shaft 20 is assembled from one axial side so that the spline portion 21 is spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 235 of the biasing member 230.

When the input shaft 20 is spline-fitted to the flywheel 10, the release operation part 22' provided on the transmission case 5, which is moved together with the input shaft 20 to the other axial direction, abuts against the second circumferential extension part 243b of the temporary fastening member 240, and as the input shaft 20 moves to the other axial direction, the release operation part 22' moves the other rotational side of the second circumferential extension part 243b of the temporary fastening member 240 to the other axial direction, and the temporary fastening part 242 moves to the other axial direction.

When the release operation part 22' moves the temporary fastening part 242 to the other axial direction of the input shaft 20 until the temporarily fastened part 236 is positioned within the recess 245 without contacting the recess 245, the release operation part 22' releases the temporary fastening of the biasing member 230 to the flywheel 10, and the input shaft 20 is assembled to the flywheel 10 by being spline-fitted.

When the input shaft 20 is moved to the other axial direction until the provisionally fastened portion 236 is positioned within the recess 245, the inner annular portion 232 of the biasing member 230 moves to one side in the rotational direction relative to the outer annular portion 231 by the spring portion 233, and the biasing member 230 is engaged with the flywheel 10 and, in the first tension state of the spring portion 233, the spline portion 235 engages with the spline portion 21 of the input shaft 20, biasing the input shaft 20 to one side in the rotational direction relative to the flywheel 10.

For the power transmission device 206, at the spline engagement portion where the spline portion 12 of the flywheel 10 and the spline portion 21 of the input shaft 20 are spline-engaged, the input shaft 20 is urged in one direction of rotation by the urging member 230, the other side of the teeth of the spline portion 21 of the input shaft 20 is engaged in one direction of rotation of the teeth of the spline portion 235 of the urging member 230, and the one side of the teeth of the spline portion 21 of the input shaft 20 is engaged in the other direction of rotation of the teeth of the spline portion 12 of the flywheel 10.

In this way, the power transmission device 206 also uses a biasing member 230 that biases the input shaft 20 in the rotational direction relative to the flywheel 10, and a temporary fastening member 240 that temporarily fastens the biasing member 230 to the flywheel 10, and the biasing member 230 biases the input shaft 20 in one direction relative to the flywheel 10, thereby suppressing the teeth rattle noise at the spline engagement portion between the flywheel 10 and the input shaft 20.

In the power transmission device 206, the biasing member 230 is attached to the flywheel 10 by engaging it with it, the temporary fastening member 240 is attached to the flywheel 10 and the biasing member 230, and the biasing member 230 is temporarily fastened to the flywheel 10 with the spring portion 233 in a tensioned state, and the input shaft 20 supported by the transmission case 5 is spline-fitted and assembled to the flywheel 10, so that the input shaft 20 can be spline-fitted and assembled to the flywheel 10 with good assembly properties.

In the power transmission device 206, the temporary fastening member 240 may be fixed to and attached to the biasing member 230 before the biasing member 230 is engaged and attached to the flywheel 10, or may be fixed to and attached to the biasing member 230 after the biasing member 230 is engaged and attached to the flywheel 10.

In this embodiment, the biasing member 230 is configured to bias the input shaft 20 in one direction relative to the flywheel 10 in the rotational direction, but the biasing member 230 may also bias the input shaft 20 in the other direction relative to the flywheel 10.

The biasing member 230 has a spring portion 233 that can be pulled in the rotational direction, and is formed so that when the spring portion 233 is in a first tension state, it biases the input shaft 20 in one direction of the rotational direction relative to the flywheel 10. The temporary fixing member 240 is formed so that the biasing member 230 is temporarily fixed to the flywheel 10 when the spring portion 233 is in a second tension state in which it is pulled further than the first tension state. The spring portion 233 is configured so that it can be elastically displaced in the tension direction in the rotational direction, but it can also be configured so that it can be elastically displaced in the compression direction in the rotational direction.

The biasing member 230 has a spring portion that can be compressed in the rotational direction, and is formed so as to bias the input shaft 20 in one direction of rotation relative to the flywheel 10 when the spring portion is in a first compressed state, and the temporary fastening member 240 can also be formed so as to temporarily fasten the biasing member 230 to the flywheel 10 when the spring portion is in a second compressed state in which it is more compressed than the first compressed state.

In this case, the spring portion is compressed in the rotational direction by the inner annular portion 232 moving in the other direction relative to the outer annular portion 231, and the release operation portion 22' provided on one axial side of the spline portion 21 of the input shaft 20 is configured to release the temporary fastening of the urging member 230 to the flywheel 10 by the temporary fastening portion of the temporary fastening member 240 so that when the spline portion 21 of the input shaft 20 is spline-fitted to the spline portion 12 of the flywheel 10 through the spline portion 235 of the urging member 230 in the first compressed state, the spline portion 235 of the urging member 230 engages with the spline portion 21 of the input shaft 20 to urge the input shaft 20 in one direction relative to the flywheel 10.

In this way, in the power transmission device 206 according to this embodiment, when the first and second power transmission members 10, 20 are assembled by spline fitting, the biasing member 230 is engaged with the first power transmission member 10 and the spline portion 235 is engaged with the spline portion 21 of the second power transmission member 20 in the first elastic displacement state of the spring portion 233 to bias the second power transmission member 20 in one rotational direction relative to the first power transmission member 10, and the temporary fastening member 240 has a temporary fastening portion 242 that temporarily fastens the biasing member 230 to the first power transmission member 10 in the second elastic displacement state in which the spring portion 233 is elastically displaced from the first elastic displacement state. A release operation portion 22' is provided on one axial side of the spline portion 21 of the second power transmission member 20 to release the temporary fastening of the biasing member 230 to the first power transmission member 10 by the temporary fastening portion 242.

As a result, the biasing member 230 is attached by engaging it with the first power transmission member 10, the temporary fastening member 240 is attached to the first power transmission member 10 and the biasing member 30, the biasing member 230 is temporarily fastened to the first power transmission member 10 in the second elastic displacement state of the spring portion 233, and the spline portion 21 of the second power transmission member 20 is spline-fitted to the spline portion 12 of the first power transmission member 10 through the spline portion 235 of the biasing member 230 to assemble the second power transmission member 20 to the first power transmission member 10. This releases the temporary fastening of the biasing member 230 to the first power transmission member 10 by the temporary fastening portion 242 of the temporary fastening member 240, and biases the second power transmission member 20 to one side in the rotational direction relative to the first power transmission member 10, thereby suppressing the teeth rattle noise of the spline fitting portions of the first and second power transmission members 10, 20.

Without changing the shape of the splined portions 12, 21 of the first and second power transmission members 10, 20, the biasing member 230 is engaged with the first power transmission member 10, the biasing member 230 is temporarily fixed to the first power transmission member 10 by the temporary fixing member 240, and the second power transmission member 20 is spline-fitted to the first power transmission member 10, so that the second power transmission member 20 can be biased to one side in the rotational direction relative to the first power transmission member 10, and assembly can be performed relatively easily. Therefore, with a relatively simple configuration, it is possible to suppress the rattle noise of the spline-fitted portions of the first and second power transmission members 10, 20 with good assembly properties.

The biasing member 230 also includes a spring portion 233, a locking portion 234, a spline portion 235, an inner annular portion 232, an outer annular portion 231, and a temporarily fixed portion 236 that is temporarily fixed to the temporary fixing portion 242. The locking portion 234 is connected to the outer annular portion 231, and the spline portion 235 and the temporarily fixed portion 236 are connected to the inner annular portion 232. One end of the spring portion 233 is connected to the outer annular portion 231 and the other end of the spring portion 233 is connected to the inner annular portion 232. The inner annular portion 232 is moved in the other direction in the rotational direction relative to the outer annular portion 231, and is elastically displaced in the rotational direction.

As a result, a biasing member 230 is used that has a spring portion 233 that is elastically displaced in the rotational direction when the inner annular portion 232 is moved in the other direction relative to the outer annular portion 231. This eliminates the need to use a spring retaining member to retain the spring, as is the case when a spring is used as the biasing member 230, thereby improving ease of assembly.

The temporary fastening member 240 is fixedly attached to the outer annular portion 231 of the biasing member 230. This makes it possible to suppress circumferential rattle of the temporary fastening member 240 when the first and second power transmission members 10, 20 are spline-fitted and assembled.

The temporary fastening members 240 are attached to the biasing member 230 at equal intervals in the circumferential direction in multiple numbers. This makes it possible to effectively suppress the rattle noise of the spline engagement portions of the first and second power transmission members 10, 20 by the temporary fastening members 240 attached to the biasing member 230 at equal intervals in the circumferential direction in multiple numbers.

The release operation unit 22' is provided on the case 5 that rotatably supports the second power transmission member 20. As a result, the temporary fastening of the biasing member 230 can be released by the release operation unit 22' provided on the case 5 that moves together with the second power transmission member 20 to the other axial side, and the temporary fastening of the biasing member 230 can be released using the inertial mass of the case 5.

Figure 38 is a diagram showing a modified example of the temporary fastening member according to the third embodiment. The temporary fastening member 240' shown in Figure 38, like the temporary fastening member 240, has a fixing portion 241 fixed to the biasing member 230, a temporary fastening portion 242 that temporarily fastens the biasing member 230 to the flywheel 10, and a temporary fastening main body portion 243 that connects the fixing portion 241 and the temporary fastening portion 242 and extends in the circumferential direction.

The temporary fastening body 243 also has a first circumferential extension 243a, a second circumferential extension 243b, and a connecting portion 243c that connects the first circumferential extension 243a and the second circumferential extension 243b and extends in an arc, and is formed in a substantially U-shape.

The fixing portion 241 is also provided on the other rotational side of the first circumferential extension portion 243a of the temporary fastening body portion 243, and is arranged along one axial side of the outer annular portion 231 of the biasing member 230, and is fixed to the outer annular portion 131 by welding or the like.

In the temporary fastening member 240, the second circumferential extension portion 243b and the first circumferential extension portion 243a of the temporary fastening body portion 243 extend in parallel in the circumferential direction, but in the temporary fastening member 240', the second circumferential extension portion 243b and the first circumferential extension portion 243a are formed to be spaced apart by a predetermined angle θ5. The predetermined angle θ5 is set to, for example, an angle between 5 degrees and 10 degrees.

Figure 39 is an explanatory diagram for explaining the temporary fastening of the biasing member by the temporary fastening member. As shown in Figure 39 (a), in the temporary fastening member 240', the second circumferential extension portion 243b of the temporary fastening main body portion 243 is elastically displaced in the other axial direction so that the second circumferential extension portion 243b and the first circumferential extension portion 243a of the temporary fastening main body portion 243 are parallel to each other, and the fixing portion 241 is fixed to the biasing member 230 by welding or the like. As a result, the temporary fastening member 240' is configured so that the other side of the rotational direction of the second circumferential extension portion 232b of the temporary fastening main body portion 243 can move in the one axial direction by elastic force relative to the fixing portion 241, and the temporary fastening portion 242 can move in the one axial direction.

The temporary fastening portion 242 can move axially to one side relative to the fixed portion 241 due to the elastic force of the temporary fastening member 240', but the temporarily fastened portion 236 of the biasing member 230 is restricted from moving axially to one side by the side surface on the other axial side of the recess 245 of the temporary fastening member 240'.

As shown in FIG. 39(b), when the temporarily fastened portion 236 of the urging member 230 is moved to the other side in the rotational direction by an operator or the like and the spring portion 233 of the urging member 230 is pulled, the temporarily fastened portion 242 is moved to one axial side relative to the fixed portion 241 by the elastic force of the temporarily fastened member 240', and the temporarily fastened portion 242 temporarily fastens the urging member 230 in a second tension state in which the spring portion 233 of the urging member 230 is pulled further than in the first tension state.

In this way, the temporary fastening member 240' may have a fixed portion 241 fixed to the biasing member 230, a temporary fastening portion 242, and a connection portion 243 that connects the fixed portion 241 and the temporary fastening portion 242 and fixes the fixed portion 241 to the biasing member 230 in a state in which the temporary fastening portion 242 is elastically displaced in the other axial direction relative to the fixed portion 241, and may be configured so that the temporary fastening portion 242 moves by elastic force in one axial direction relative to the fixed portion 241 fixed to the biasing member 230, and the temporary fastening portion 242 temporarily fastens the biasing member 230.

In such a case, the temporary fastening member 240' is configured so that the temporary fastening portion 242 moves by elastic force in one axial direction relative to the fixing portion 241 fixed to the biasing member 230, and the temporary fastening portion 242 temporarily fastens the biasing member 230. This can suppress the rattle noise of the spline engagement portion of the first and second power transmission members 10, 20, and can also suppress circumferential rattle of the temporary fastening member 240' when the first and second power transmission members 10, 20 are spline-engaged and assembled.

In the above-described embodiment, the flywheel 10 is used as the first power transmission member, and the input shaft 20 of the transmission 3 is used as the second power transmission member. However, when a damper device is connected to the flywheel 10, the output member of the damper device can be used instead of the flywheel as the first power transmission member, and the same can be applied.

The present invention is not limited to the illustrated embodiments, and various improvements and design changes are possible without departing from the spirit of the present invention.

As described above, according to the present invention, it is possible to suppress the rattle noise of the spline engagement portion of the first and second power transmission members with good assembly properties using a relatively simple configuration, and therefore the present invention may be suitably used in vehicles equipped with a power transmission device having first and second power transmission members that are assembled by spline engagement.

5 Transmission case 6, 106, 206 Power transmission device 10 Flywheel (first power transmission member)
12 spline portion of flywheel 20 input shaft (second power transmission member)
21 spline portion 22, 22' of input shaft; release operation portion 30, 130, 230 biasing member 31, 131, 231 outer annular portion 32, 132, 232 inner annular portion 33, 133, 233 spring portion 34, 134, 234 locking portion 35, 135, 235 spline portion 36, 136, 236 of biasing member temporarily fastened portion 40, 140, 240 temporary fastening member 41, 143, 243 temporary fastening main body portion 42, 142, 242 temporary fastening portion 43 regulated portion 44, 145, 244 abutment portion 45, 146, 245 recess 141 fixing portion

Claims (13)

A power transmission device including a first power transmission member and a second power transmission member that are assembled by spline fitting,
a biasing member having a spring portion elastically displaceable in a rotational direction, a locking portion provided on one end of the spring portion and locked to the first power transmission member, and a spline portion provided on the other end of the spring portion, the biasing member being disposed on one axial side of the first power transmission member and locked to the first power transmission member, and the spline portion being engaged with a spline portion of the second power transmission member in a first elastically displaced state of the spring portion, biasing the second power transmission member in one rotational direction relative to the first power transmission member;
a temporary fastening member disposed on one axial side of the biasing member and having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member when the spring portion is in a second elastic displacement state in which it is elastically displaced from the first elastic displacement state,
a release operation portion is provided on one axial side of the spline portion of the second power transmission member, the release operation portion releasing the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion of the temporary fastening member such that, when the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member from one axial side of the temporary fastening member through the spline portion of the biasing member, the spline portion of the biasing member engages with the spline portion of the second power transmission member in the first elastic displacement state of the spring portion to bias the second power transmission member to one side in a rotational direction relative to the first power transmission member,
A power transmission device characterized by: the urging member includes the spring portion, the locking portion, the spline portion, an inner annular portion having an annular shape disposed radially inward, an outer annular portion having an annular shape disposed radially outward, and a temporarily fixed portion temporarily fixed to the temporarily fixing portion,
The locking portion is connected to the outer annular portion,
the spline portion and the temporarily fastened portion are connected to the inner annular portion,
The spring portion has one end connected to the outer annular portion and the other end connected to the inner annular portion, and is elastically displaced in the rotational direction by the inner annular portion moving in the other direction relative to the outer annular portion.
2. The power transmission device according to claim 1. the temporary fastening member includes a temporary fastening main body portion into which a spline portion of the second power transmission member is inserted, and the temporary fastening portion extends from the temporary fastening main body portion to the other axial side,
the temporary fastening portion has a restricted portion that is restricted by the first power transmission member on one side in a rotational direction, and a contact portion that abuts against the temporarily fastened portion on the other side in the rotational direction, and a recess that is recessed toward the one side in the rotational direction in an axial direction of the contact portion,
The power transmission device according to claim 2, characterized in that when the release operating portion releases the temporary fastening of the biasing member to the first power transmission member, the release operating portion of the second power transmission member moves the temporary fastening main body portion and the temporary fastening portion to the other axial side, and the temporarily fastened portion is positioned within the recess. 4. The power transmission device according to claim 1, further comprising an assist mechanism that assists the release operation of the release operation portion in releasing the temporary fastening of the biasing member. the biasing member includes a temporarily fixed portion that is temporarily fixed to the temporarily fixing portion,
the temporary fastening portion has a restricted portion that is restricted by the first power transmission member on one side in a rotational direction, and a contact portion that contacts the temporary fastening portion on the other side in the rotational direction,
The abutment portion is formed by an inclined surface portion that is inclined toward one side in the rotation direction as it approaches one side in the axial direction,
5. The power transmission device according to claim 4, wherein the assist mechanism is formed by the inclined surface portion. 3. The power transmission device according to claim 2, wherein the temporary fastening member is fixedly attached to an outer annular portion of the biasing member. 7. The power transmission device according to claim 6, wherein a plurality of the temporary fastening members are attached to the biasing member at equal intervals in the circumferential direction. The power transmission device according to claim 6 or claim 7, characterized in that the temporary fastening member has a fixing portion fixed to the biasing member, the temporary fastening portion, and a connection portion that connects the fixing portion and the temporary fastening portion and fixes the fixing portion to the biasing member while the temporary fastening portion is elastically displaced toward the other axial direction relative to the fixing portion, and is configured so that the temporary fastening portion moves toward one axial direction due to an elastic force relative to the fixing portion fixed to the biasing member, and the temporary fastening portion temporarily fastens the biasing member. 9. The power transmission device according to claim 6, wherein the release operation portion is provided on a case that rotatably supports the second power transmission member. 10. The power transmission device according to claim 6, further comprising an assist mechanism that assists the release operation of the release operation portion in releasing the temporary fastening of the biasing member. the biasing member includes a temporarily fixed portion that is temporarily fixed to the temporarily fixing portion,
the temporary fastening portion has a contact portion that contacts the temporarily fastened portion on the other side in the rotational direction,
the abutment portion is formed by an inclined surface portion that is inclined toward one side in the rotation direction as it approaches one side in the axial direction,
11. The power transmission device according to claim 10, wherein the assist mechanism is formed by the inclined surface portion. the first power transmission member is a flywheel connected to an output shaft of an engine,
12. The power transmission device according to claim 1, wherein the second power transmission member is an input shaft of a transmission. 1. A method for assembling a power transmission device including a first power transmission member and a second power transmission member that are assembled by spline fitting, comprising the steps of:
a step of attaching a biasing member having a spring portion elastically displaceable in a rotational direction, a locking portion provided on one end of the spring portion and locked to the first power transmission member, and a spline portion provided on the other end of the spring portion, the spline portion engaging with the spline portion of the second power transmission member in a first elastically displaced state of the spring portion to bias the second power transmission member in one rotational direction direction relative to the first power transmission member by locking the locking portion to the first power transmission member from one axial side;
a step of attaching a temporary fastening member having a temporary fastening portion that temporarily fastens the biasing member to the first power transmission member in a second elastic displacement state in which the spring portion is elastically displaced from the first elastic displacement state to the first power transmission member and the biasing member from one axial side of the biasing member, thereby temporarily fastening the biasing member to the first power transmission member in the second elastic displacement state of the spring portion;
and assembling the second power transmission member to the first power transmission member by spline-fitting the spline portion of the second power transmission member to the spline portion of the first power transmission member through the spline portion of the biasing member from one axial direction side of the temporary fastening member,
a release operating portion is provided on one axial side of the spline portion of the second power transmission member for releasing the temporary fastening of the biasing member to the first power transmission member by the temporary fastening portion of the temporary fastening member so that when the spline portion of the second power transmission member is spline-fitted to the spline portion of the first power transmission member, the spline portion of the biasing member engages with the spline portion of the second power transmission member in the first elastic displacement state of the spring portion to bias the second power transmission member to one side in a rotational direction relative to the first power transmission member.

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