JPS6363779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic transmission, and more particularly, it includes a planetary gear mechanism, a one-way clutch, and a centrifugal clutch between an input side and an output side, and when the input side rotates at a low speed, the transmission changes between the input and output sides. The present invention relates to an automatic transmission device that is directly connected to the vehicle and is configured to reduce rotational torque on the input side and transmit it to the output side during high-speed rotation.

Conventionally, in such an automatic transmission, a planetary gear mechanism Gp is interposed between an input shaft 6 and a pulley 7 as an output member, as shown in FIG. A one-way clutch Co is interposed between the input shaft 6 and the fixed member 54, and a centrifugal clutch Cc is interposed between the input shaft 6 and the internal gear 44.
is interposed. Further, the sun gear 45 of the planetary gear mechanism Gp is fixed to the input shaft 6, and the carrier 47 holding the planetary gear 46 is integrated with the pulley 7. In such a conventional automatic transmission, when the rotation speed of the input shaft 6 is lower than a preset value, the input shaft 6 and the internal gear 44 are coupled by the centrifugal clutch Cc, and the one-way clutch Co is connected to the internal gear 44. Rotation of the gear 44 in the same direction as the input shaft 6 is allowed.
Therefore, the input shaft 6 and the pulley 7 are directly connected, and the rotational speed of the input shaft 6 is directly transmitted to the pulley 7. Furthermore, when the rotational speed of the input shaft 6 exceeds the set value, the centrifugal clutch is activated.
Cc releases the coupling state between the input shaft 6 and the internal gear 44. On the other hand, since rotational torque in the opposite direction to the input shaft 6 is applied to the internal gear 44 from the input shaft 6 via the sun gear 45 and the planetary gear 46, the one-way clutch Co
The internal gear 44 is coupled to the fixing member 54 by inhibiting rotational movement in the opposite direction to the input shaft 6 of the internal gear 44. Therefore, in the planetary gear mechanism Gp, the planetary gear 46 revolves in the same direction as the sun gear 45, that is, the input shaft 6, while meshing with the stationary internal gear 44,
The pulley 7 is driven to reduce speed via the carrier 47.

However, in such a conventional automatic transmission, when the input shaft 6 is operated at low speed, the torque of the load driven by the pulley 7 acts on the meshing portions of the gears 44, 45, and 46 of the planetary gear mechanism Gp. ing.
In particular, when the pulley 7 drives a hydraulic pump for power steering of an automobile, the driving torque is large when the engine rotates at low speed, that is, when the input shaft 6 and the pulley 7 are directly connected. Furthermore, when a compressor for an air conditioner is driven by a pulley, torque fluctuations are large when the engine rotates at low speed, and the torque fluctuation of the engine itself is also large.
Further, the gears are provided with backlashes to ensure smooth meshing between the gears. In this way, when the input shaft 6 rotates at low speed, (a) the driving torque is large, (b) the torque fluctuation is large, and (c) the gear is provided with backlash, especially due to , each gear 44, 45 in the planetary gear mechanism Gp,
46 vibrate in mutual meshing positions. As a result, noise is generated, and the wear caused by hitting increases, resulting in a decrease in the durability of the planetary gear mechanism Gp. Particularly when the pulley 7 is used to drive an on/off controlled compressor for an air conditioner or the like, when the backlash of the gear is relatively large, the impact torque applied when starting the compressor further reduces the durability.

The present invention was made to solve such conventional technical problems, and aims to provide an automatic transmission device with a simple structure that improves durability and suppresses noise generation. , the feature is that an output part is integrally provided on the outer periphery of a housing that is rotatably supported on a hollow fixed shaft via a first bearing, and that the output part is rotatably penetrated through the hollow part of the fixed shaft and inserted into the housing. A second bearing is interposed between the end of the input shaft that has entered the input shaft and the housing, and a second bearing is provided between the input shaft and the housing to connect the input shaft and the housing when the input shaft rotates at low speed. A centrifugal clutch that releases the coupling state when the input shaft rotates at high speed, and a planetary gear mechanism that decelerates the rotational torque of the input shaft and transmits it to the housing are interposed in parallel with each other, and the planetary gear mechanism is integrally connected to the input shaft. a planetary gear that is pivotally supported by a housing and meshes with the internal gear; and a sun gear that meshes with the planetary gear; In between, in order to fix the sun gear and decelerate the planetary gear mechanism when the centrifugal clutch is disengaged due to high-speed rotation of the input shaft, the sun gear is rotated only in the same direction as the input shaft. A one-way clutch is provided to allow this.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, in FIGS. 1 and 2, which show an embodiment of the present invention when the device of the present invention is mounted on an engine for driving auxiliary equipment of an automobile, a crankshaft of an engine E is shown. 1 is rotatably supported by the cylinder block 2 via a bearing 3 and a seal member 4, and has an end projecting outward from the cylinder block 2. The protruding end thereof is the input shaft 6 of the automatic transmission 5 according to the present invention.
functions as This input shaft 6 has a housing 8 integrally provided with a pulley 7 as an output section on the outer periphery.
A planetary gear mechanism Gp and a centrifugal clutch Cc are inserted between the input shaft 6 and the housing 8.
is interposed. Further, the housing 8 is rotatably supported by a first fixed shaft 10.
A one-way clutch Co is interposed between the second fixed shaft 11, which is substantially integrated with the planetary gear mechanism Gp.

The housing 8 has a bottomed cylindrical part 1 arranged concentrically with the input shaft 6 and having a hole 13 concentrically bored in the bottom thereof.
4, a ring-shaped cover 16 that is fitted onto the open end of the bottomed cylindrical portion 14 via a sealing material 15, and a cap 18 that closes the hole 13 via a sealing material 17. The pulley 7 is integrally provided on the outer side of the bottomed cylindrical portion 14 of the housing 8, and the pulley 7 is equipped with auxiliary equipment (not shown) such as a hydraulic pump for power steering and a compressor for an air conditioner. An endless belt 19 for driving is wound.

A keyway 20 is bored in a portion of the input shaft 6 near the cylinder block 2.
0 through the key 21 fitted to the housing 8
The timing belt pulley 22 is connected to the input shaft 6 on the outside of the
is fixed to the input shaft 6, and a sealing material 12 is attached to the input shaft 6.
A cylindrical rotating shaft 23 that is inserted into the housing 8 and protrudes into the housing 8 is fixed to the input shaft 6. An endless timing belt 24 is wound around the timing belt pulley 22. Cap 18 of rotating shaft 23
The side end portion is rotatably supported on the inner surface of the hole 13 of the housing 8 via a bearing 25 . Further, a bolt 26 is screwed concentrically from the end of the rotating shaft 23 to the input shaft 6, and this bolt 26 has a ventilation hole 27 formed concentrically in the crankshaft 1 and the input shaft 6. A vent hole 28 is provided which is connected to the vent hole 28 . These vent holes 27 and 28 function to make the inside of the housing 8 at the same pressure as the crank chamber of the engine E.

The first fixed shaft 10 is formed into a cylindrical shape surrounding the rotating shaft 23, and a bearing 29 and a sealing material 30 to prevent lubricating oil from leaking are interposed between the first fixed shaft 10 and the rotating shaft 23. Ru. This first fixed shaft 10
, there is a support arm 31 extending toward the cylinder block 2 side.
A pin 33 implanted in the cylinder block 2 is inserted into an elastic body 32 provided at the end of the support arm 31. Therefore, the first fixed shaft 10 is prevented from rotating about its axis. An outer peripheral surface of the first fixed shaft 10,
A bearing 34 and a sealing material 35 are interposed between the housing 8 and the inner peripheral edge of the cover 16 .

A radially extending disk-shaped flange portion 36 is integrally provided on the rotating shaft 23 near the bottom of the bottomed cylindrical portion 14 in the housing 8 . A cylindrical portion 37 extending on both sides of 36 in the axial direction is integrally provided.

The centrifugal clutch Cc includes a plurality of weights 38 that are movable along the radial direction of the flange portion 36 on the bottom side of the bottomed cylindrical portion 14, and a plurality of springs interposed between the weights 38 and the cylindrical portion 37, respectively. 39, a friction shoe 40 attached to the inner end of each weight 38 along the radial direction of the flange portion 36, and a friction shoe 40 provided integrally around the hole 13 of the bottomed cylindrical portion 14 in the housing 8. Each of the friction shoes 40 includes a drum 41 that can be frictionally engaged. Each weight 38 has a long hole 42 extending along the radial direction of the flange portion 36, and a pin 43 implanted in the flange portion 36 is engaged with each long hole 42. Therefore, each weight 38 is supported by the flange portion 36 so as to be slidable in the radial direction along the surface of the flange portion 36.

In such a centrifugal clutch Cc, each weight 38
Due to the spring force of the spring 39, the radially inward portion of the flange portion 36, that is, each friction shoe 40 is moved against the drum 4.
1 in the direction of frictional engagement. Therefore, when the centrifugal force acting on each weight 38 corresponding to the rotational speed of the flange portion 36, that is, the rotational speed of the input shaft 6, is weaker than the spring force of the spring 39, each friction shoe 40 causes friction against the drum 41. engage. As a result, the housing 8 and the input shaft 6 are directly coupled via the centrifugal clutch Cc. However, when the rotational speed of the input shaft 6 increases and the centrifugal force acting on each weight 38 becomes greater than the spring force of the spring 39, each friction shoe 40 separates from the drum 41, and the centrifugal force acts on each weight 38. Torque is no longer transmitted to the housing 8 via the clutch Cc.

The planetary gear mechanism Gp includes an internal gear 44, a sun gear 45, and a plurality of planetary gears 46 disposed at intervals in the circumferential direction so as to mesh with both gears 44 and 45.
and a carrier 47 that holds each planetary gear 46. The internal gear 44 is provided at the end of the cylindrical portion 37 closer to the engine E. Also, sun gear 45
is formed in a cylindrical shape, and this inner peripheral surface and the second
A one-way clutch Co is interposed between the fixed shaft 11 and the fixed shaft 11. The second fixed shaft 11 is connected to the first fixed shaft 10 via a spline 48 and is therefore substantially integrated with the first fixed shaft 10 . Further, the one-way clutch Co only allows rotation of the sun gear 45 in the same direction as the input shaft 6. The carrier 47 is connected to the planetary gear 46 and the second fixed shaft 11
A pair of clamping plates 49, 50 that sandwich the 2-pin from both sides, and the shaft 5 of the planetary gear 46 that is inserted through both clamping plates 49, 50.
1 and a screw member 5 that connects both clamping plates 49 and 50.
2, and the clamping plate 49 is coupled to the cover 16 of the housing 8 by a screw member 53. The carrier 47 is therefore integrated into the housing 8.

Next, the operation of this embodiment will be explained. When the rotational speed of the crankshaft 1 of the engine E, that is, the input shaft 6 is slow, the input shaft 6 and the housing 8 are directly connected via the centrifugal clutch Cc.
The rotational torque of the input shaft 6 is transmitted from the centrifugal clutch Cc, the housing 8 and the pulley 7 to the auxiliary equipment via the belt 19. At this time, the planetary gear mechanism Gp
In this case, rotational torque in the same direction as the input shaft 6 is applied from the carrier 47 via the planetary gear 46. Moreover, since the one-way clutch Co allows the sun gear 45 to rotate in the same direction as the input shaft 6, the sun gear 45 idles around the one-way clutch Co. In this state, the meshing portion of the internal gear 44 and the planetary gear 46 in the planetary gear mechanism Gp,
Also, no load torque acts on the meshing portions of the planetary gear 46 and the sun gear 45. Therefore,
Even if the backlash of each of the gears 44, 45, and 46 is relatively large, vibration of each meshing portion due to the load torque does not occur. the result,
No noise is generated, there is no wear caused by hitting, and even if impact torque is applied, the durability of the gears 44, 45, 46 does not deteriorate.

Next, when the rotational speed of the input shaft 6 becomes high and the direct connection between the input shaft 6 and the housing 8 by the centrifugal clutch Cc is released, in the planetary gear mechanism Gp, A rotational torque in a direction opposite to that of the input shaft 6 is applied to the sun gear 45 . Here, the one-way clutch Co prevents the sun gear 45 from rotating in the opposite direction to the input shaft 6, so the sun gear 45 is fixed. the result,
The planetary gear 46 , which is given rotational driving force from the internal gear 44 , revolves around the sun gear 45 while meshing with the sun gear 45 . can be conveyed to. Therefore, the rotational torque of the input shaft is transmitted to the housing 8, that is, the pulley 7, with a reduction ratio specific to the planetary gear mechanism Gp, and driving force is provided to the auxiliary equipment at a rotational speed higher than necessary. There isn't.

As described above, according to the present invention, the output portion is integrally provided on the outer periphery of the housing rotatably supported by the hollow fixed shaft via the first bearing, and the output portion is provided rotatably in the hollow portion of the fixed shaft. A second bearing is interposed between the end of the input shaft that penetrates into the housing and the housing, and a second bearing is provided between the input shaft and the housing to prevent the input shaft and the housing from rotating when the input shaft rotates at a low speed. A centrifugal clutch that connects and releases the connected state when the input shaft rotates at high speed, and a planetary gear mechanism that decelerates the rotational torque of the input shaft and transmits it to the housing are interposed in parallel with each other, and the planetary gear mechanism An internal gear connected to an input shaft so as to rotate integrally with the input shaft, a planetary gear pivotally supported by a housing and meshing with the internal gear, and a sun gear meshing with the planetary gear. The sun gear is connected to the fixed shaft in the same direction as the input shaft in order to fix the sun gear and decelerate the planetary gear mechanism when the centrifugal clutch is disengaged due to high-speed rotation of the input shaft. Since a one-way clutch is installed that only allows rotational movement of Load torque is no longer applied to the meshing parts, and as a result, there is no risk of vibrations occurring in the meshing parts of each gear even due to torque fluctuations that increase when the engine rotates at low speeds, and the meshing parts are not struck. Wear is suppressed, the durability of the planetary gear mechanism is improved, and the generation of noise is prevented. Also, since the one-way clutch is interposed between the fixed shaft through which the input shaft rotatably passes and the sun gear of the planetary gear mechanism,
The one-way clutch can be made smaller, and the sun gear can also be used as a clutch element of the one-way clutch, contributing to the simplification of the structure.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 show an embodiment of the present invention, Fig. 1 is a vertical sectional view specifically showing the structure, Fig. 2 is a schematic diagram thereof, and Fig. 3 is an outline showing the conventional structure. It is a diagram. 5... Automatic transmission, 6... Input shaft, 7... Pulley as output section, 8... Housing, 10... Fixed shaft,
44... Internal gear, 45... Sun gear, 46... Planetary gear, Cc... Centrifugal clutch, Co... One-way clutch,
Gp…Planetary gear mechanism.

Claims (1)

[Claims] 1. An output part 7 is integrally provided on the outer periphery of a housing 8 which is rotatably supported by a hollow fixed shaft 10 via a first bearing 34, and is rotatably penetrated through the hollow part of the fixed shaft 10 to form a housing. A second bearing 25 is interposed between the end of the input shaft 6 protruding into the housing 8 and the housing 8. a centrifugal clutch that connects the input shaft 6 and the housing 8 and releases the connected state when the input shaft 6 rotates at high speed;
Cc and a planetary gear mechanism Gp that decelerates the rotational torque of the input shaft 6 and transmits it to the housing 8 are interposed in parallel with each other, and the planetary gear mechanism Gp is connected to the input shaft 6 so as to rotate integrally therewith. Internal gear 4
4, and the internal gear 4 is pivotally supported by the housing 8.
A planetary gear 46 that meshes with 4, and this planetary gear 46
The sun gear 45 is fixed between the sun gear 45 and the fixed shaft 10 when the centrifugal clutch Cc is disengaged due to high speed rotation of the input shaft 6. planetary gear mechanism
In order to decelerate Gp, the sun gear 45
An automatic transmission device characterized in that a one-way clutch Co that only allows rotational movement in the same direction as the input shaft 6 is installed.