JP3245294B2 - Clutch pressing assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch pressing assembly,
More particularly, the present invention relates to a clutch pressing assembly for pressing and releasing a clutch disk against a friction surface of a flywheel.

[0002]

2. Description of the Related Art A clutch device is arranged between a crankshaft on the engine side and a transmission.

[0003] The clutch device mainly comprises a clutch disc assembly and a clutch pressing assembly. The clutch disc assembly has an annular clutch disc that can abut the friction surface of the flywheel and a hub flange with which the main drive shaft of the transmission is splined. The clutch pressing assembly includes a dish-shaped clutch cover having an outer peripheral end fixed to the flywheel,
It has an annular pressure plate housed in the clutch cover for pressing the clutch disc against the friction surface of the flywheel, and a diaphragm spring supported by the clutch cover for pressing the pressure plate toward the flywheel. The clutch pressing assembly further includes a strap plate that connects the clutch cover and the pressure plate so that they cannot rotate relative to each other. The strap plate is a plate-like elastic member made of a plurality of steel strips, and is provided in a plurality of notch portions formed in the clutch cover so as to extend in a circumferential tangential direction. The strap plate is elastically deformable in the axial direction, and biases the pressure plate in a direction away from the flywheel. Thus, when the pressing force of the diaphragm spring against the pressure plate is released, the pressure plate separates from the flywheel side.

[0004]

In the above-mentioned conventional clutch pressing assembly, it is difficult to disengage the pressure plate from the clutch cover because the strap plate is disposed in the notch portion of the clutch cover.
As a result, replacement of the clutch disk assembly becomes difficult.

[0005] Further, a protruding portion protruding radially outward for attaching one end of the strap plate to the pressure plate is formed. The formation of the protrusion complicates the processing and increases the manufacturing cost.

SUMMARY OF THE INVENTION It is an object of the present invention to facilitate disassembly of parts, and to separate a pressure plate from a flywheel side.
The rigidity in the axial direction of the member that applies the urging force in the direction
It is in.

Another object of the present invention is to reduce the number of parts. Still another object of the present invention is to obtain a larger friction surface outer diameter. Still another object of the present invention is to provide
The simplification of the processing is intended.

Still another object of the present invention is to make the urging force for urging the pressure plate away from the flywheel side uniform in the circumferential direction. Yet another object of the present invention is to reduce costs.

[0009]

SUMMARY OF THE INVENTION A clutch pressing assembly according to the present invention has a flywheel having a friction surface and connected to an input-side rotating body, and a clutch disk capable of abutting the friction surface. A clutch device having a clutch disk assembly coupled to the rotating body, for pressing and releasing the clutch disk against the friction surface;
It has a pressure plate, a pressing member, and a plate member.

[0010] The pressure plate has a pressing surface for pressing the clutch disc against the friction surface. The pressing member is a member for pressing the pressure plate against the friction surface. The plate member is arranged on the side opposite to the pressing surface of the pressure plate, connects the flywheel and the pressure plate so that they cannot rotate relative to each other, and is elastically deformable in the axial direction. The plate member applies an urging force to separate the pressure plate from the flywheel side to the pressure plate when the pressing member presses the pressure plate. plate
A plurality of slits are formed in the member.

Preferably, the plate member has a support for supporting the pressing member. The plate member is preferably an annular plate having an outer peripheral portion fixed to the flywheel and an inner peripheral portion fixed to the pressure plate. It is preferable that the slits of the plate member extend alternately in the radial direction from the outer peripheral end and the inner peripheral end. The pressing member is a disc-shaped elastic member having a plurality of holes, the pressure plate has a protruding portion that protrudes in the axial direction through the plurality of holes of the pressing member, and the inner peripheral end of the plate member has a protruding portion. It is fixed to. It is preferable that an outer peripheral end of the pressing member is supported by the supporting portion of the plate member, and a radially intermediate portion presses the pressure plate toward the flywheel.

[0012]

In the clutch pressing assembly according to the present invention, the plate member is disposed on the side opposite to the pressing surface of the pressure plate. Therefore, when removing the pressure plate from the flywheel, the plate member can be easily removed. As a result, replacement of the clutch disk assembly is facilitated. In addition, a plurality of slits are formed in the plate member.
And the axial rigidity of the plate member is reduced.

When the plate member has a supporting portion for supporting the pressing member, the conventional clutch cover can be omitted, so that the number of parts can be reduced and the cost can be further reduced. Also, if the clutch cover can be omitted, the outer diameter of the clutch disc can be increased,
The friction surface of the clutch can be made larger. Further, the axial dimension of the entire assembly can be reduced.

When the plate member is an annular plate,
The urging force on the pressure plate can be made uniform in the circumferential direction. When the slits of the plate member extend radially alternately from the outer peripheral end and the inner peripheral end, the axial rigidity of the plate member can be further reduced.

When the inner peripheral end of the plate member is fixed to the pressure plate projecting portion penetrating through the hole of the pressing member, it is not necessary to particularly form a portion for fixing the plate member to the pressure plate. As a result, the processing of the pressure plate becomes easy, and the manufacturing cost can be reduced.

The above operation is more effective when the outer peripheral end of the pressing member is supported by the supporting portion of the plate member, and the intermediate portion in the radial direction presses the pressure plate toward the flywheel.

[0017]

1 to 3 show a power transmission 201 to which an embodiment of the present invention is applied. Power transmission device 20
Reference numeral 1 denotes a device for transmitting torque from a crankshaft 301 on the engine side to a main drive shaft 302 of the transmission. In FIG. 1, an engine (not shown) is arranged on the left side of the figure, and a transmission (not shown) is arranged on the right side of the figure. Further, the rotation axis of the O-O line power transmission device 201 in FIG. 1, R ₁ direction power transmission device in FIG 20
1 rotation direction.

The power transmission device 201 includes a flywheel assembly 1, a clutch disc assembly 202, and a clutch pressing assembly 203 which are integrally assembled. The flywheel assembly 1 mainly includes a flexible plate 2, a ring member 8 fixed to the flexible plate 2, a disk-shaped flywheel 3, and a ring member 8 and a flywheel 3 which are elastically arranged in a circumferential direction. And a damping part 4 for damping torsional vibration between both members.

The flexible plate 2 is a substantially disk-shaped member, can bend in the bending direction, and has high rigidity in the rotation direction. The flexible plate 2 has a center hole 2a at the center. In addition, flexible plate 2
Has a plurality of round holes 2b formed at an intermediate portion in the radial direction at equal intervals in the circumferential direction. A plurality of bolt holes 2c are formed on the inner circumference of the round hole 2b. The inner peripheral end of the flexible plate 2 is fixed to the tip of the crankshaft 301 by a bolt 6 penetrating through the bolt hole 2c. Further, a plurality of arc-shaped inertia members 7 are fixed to the outer peripheral engine side of the flexible plate 2 by rivets 51. Due to the inertia member 7, the moment of inertia of the flywheel assembly 1 is increased. Further, since the inertia member 7 has a shape obtained by dividing the annular member in the circumferential direction, the inertia member 7 does not prevent the flexible plate 2 from bending in the bending direction. The outer peripheral end of the flexible plate 2 is fixed to the ring member 8 via the disk plate 9 by a plurality of bolts 10. Inertia member 7 is bolt 10
Has a notch corresponding to.

A ring gear 11 for starting the engine is fixed to the outer periphery of the ring member 8. The attenuation unit 4 mainly includes
The first input side plate 13 and the second input side plate 14
, A boss 15, a driven plate 19, a coil spring 22, and a viscous resistance generator 25.

The first input side plate 13 and the second input side plate 14 are disk-shaped plate members. An outer peripheral wall extending toward the engine and fixed to an outer peripheral end of the first input side plate 13 is formed on an outer peripheral portion of the second input side plate 14.
This outer peripheral wall is welded to the inner periphery of the ring member 8. The diameter of the inner peripheral end of the second input side plate 14 is larger than that of the first input side plate 13. The first input side plate 13 and the second input side plate 14 form a fluid space A for accommodating the driven plate 19, the coil spring 22, the viscous resistance generator 25, and the like. This space A is filled with a viscous fluid.

The driven plate 19 is a disk-shaped member, and has an inner peripheral end connected to the flywheel 3 by a plurality of rivets 20. At the radially intermediate portion of the driven plate 19, a plurality of window holes 19a extending in the circumferential direction are formed. Further, on both sides of the outer peripheral end of the driven plate 19, annular sealing grooves 19b are formed. A plurality of projections 19d extend radially outward from the outer peripheral surface 19c of the driven plate 19.

The coil springs 22 are respectively arranged in the window holes 19 a of the driven plate 19. Sheet members 23 are disposed at both ends of the coil spring 22. The first input side plate 13 and the second input side plate 14 have spring receiving portions 13a and 14a at portions corresponding to the window holes 19a of the driven plate 19. Seat members 23 are in contact with both ends in the circumferential direction of the spring housing portions 13a and 14a. Thus, the input side plates 13 and 14 and the driven plate 19
Are elastically connected in the circumferential direction via the coil spring 22. In the free state shown in FIG. 2, the sheet member 23 is connected to the input side plate 13,
The inner peripheral portions of the spring housing portions 13a and 14a of the driven plate 19 and the end of the window hole 19a of the driven plate 19 are in contact with each other. That is, the coil spring 22 is housed in the window hole 19a in an uneven contact state.

Next, the viscous resistance generating section 25 will be described. The viscous resistance generating unit 25 includes an annular housing 27 disposed at the outermost periphery in the space A, a plurality of pins 28 connecting the housing 27 to the first input side plate 13 and the second input side plate 14, And a plurality of slide stoppers 29 arranged at the same position.

The annular housing 27 is arranged inside the outer peripheral wall of the second input side plate 14, and both end faces in the axial direction are sandwiched between the input side plates 13 and 14. An opening extending in the circumferential direction is formed on the inner peripheral side of the annular housing 27, and the outer peripheral portion of the driven plate 19 is inserted into the opening. An annular fluid chamber B filled with a viscous fluid is formed in the annular housing 27. Further, a plurality of stopper portions 27a are formed in the annular housing 27 at equal intervals in the circumferential direction. The stopper portion 27a
Dividing the annular fluid chamber B into a plurality of arcuate fluid chamber B _1.
The stopper portion 27a has a hole through which the pin 28 is inserted. The pin 28 causes the annular housing 27 to
The input side plate 13 and the second input side plate 14 are integrally rotated. The annular housing 2 determines the viscous resistance according to the length of the body of the pin 28.
7 are determined. At the radially inner end of the annular housing 27, there is formed an annular projection 27b (forming the opening therebetween) projecting in a direction approaching each other in the axial direction.
The inside of the annular fluid chamber B is sealed by fitting into the annular sealing groove 19b formed in the annular fluid chamber B. Protrusion 27
b and the sealing groove 19b are connected to the input side mechanism (the first and second input / output side plates 13,
14, a housing 27) and a part of a load (a thrust load, a radial load, a bending load) generated between the output side mechanism (the driven plate 19 and the flywheel 3). The load generated between the two mechanisms is shared and supported by the engagement portion and a bearing 17 described later. in this way,
The sealing portion of the annular fluid chamber B also serves as a load receiving portion, and the cost is reduced.

A return hole 2 is provided at an intermediate portion between the stopper portions 27a at radially inner sides of both end surfaces.
7c is formed. The return hole 27c allows the viscous fluid to freely move between the annular fluid chamber B and the inner space A.

In the free state shown in FIG. 2, the projection 19d of the driven plate 19 is located at the middle of the stopper 27a.
That is, it corresponds to the return hole 27c. Each arc-shaped fluid chamber B within _1, cap-shaped slide stoppers 29 for covering the protrusion 19d of the driven plate 19 from the outer peripheral side is arranged. The slide stopper 29 has an outer peripheral portion coinciding with the outer inner peripheral surface of the annular housing 27,
It is movably disposed circumferentially arcuate fluid chamber B within _1. The slide stopper 29 is connected to the driven plate 19
With respect to the protrusion 19d, the circumferential wall portion is freely movable in the circumferential direction within a range in which the circumferential wall portion contacts the protrusion 19d. The legs 2 extend radially inward from the four inner corners of the slide stopper 29.
9a is extended, and the tip of the leg 29a is in contact with the annular projection 27b of the annular housing 27.

Inside each arc-shaped fluid chamber B ₁ , a _first stopper chamber 31 on the R ₂ side and a _second O 1 chamber on the R ₁ side are moved by a slide stopper 29.
It is divided into an Oita room 32. Furthermore, the slide stopper 29, the second small compartment 3 of the first small compartment 33 and R ₁ side of the R ₂ side by the protrusion 19d of the driven plate 19
And is divided into: As shown in FIGS. 5 and 6 in an enlarged manner, between the first small compartment 33 and the second small compartment 34, the projection 19d of the driven plate 19 and the slide stopper 29 are provided.
The viscous fluid can flow back and forth by the gap formed between the return hole 27c and the return hole 27c. Further, the viscous fluid can move freely between the _first large compartment 31 and the first small compartment 33 through the gap between the R2 side legs 29a of the slide stopper 29, and the second small compartment 34 R _{1 side} leg portion 29 of slide stopper 29 between
It is possible to freely move back and forth through the gap a. However,
When the circumferential wall of the slide stopper 29 abuts the projection 19d, the passage of the viscous fluid inside and outside the circumferential direction of the slide stopper 29 is blocked.

A portion between the inner peripheral surface of the stopper portion 27a and the outer peripheral surface 19c of the driven plate 19 is a choke portion C. When a viscous fluid passes through the choke portion C, a large viscous resistance is generated.

At the portion where the inner peripheral portion of the driven plate 19 and the flywheel 3 are fixed by the rivets 20,
As shown in FIG. 4, the spring seal member 35 is sandwiched.
The spring seal member 35 is made of an annular thin sheet metal, and has a fixing portion 35a having a plurality of holes through which the rivet 20 passes.
An outer cylindrical portion 35b extending from the outer peripheral side of the fixed portion 35a to the transmission side, and a rebound portion 35c extending outward from the outer cylindrical portion 35b are provided. The repulsion portion 35c
The inner peripheral end of the second input side plate 14 is in contact with the engine side, and urges the inner peripheral end of the second input side plate 14 toward the transmission in the state shown in FIG. In the fluid space A, the space between the second input side plate 14 and the flywheel 3 is sealed by the spring seal member 35.

As shown in FIG. 1, the center hole at the inner peripheral end of the first input side plate 13 is fitted to the boss 15 and fixed by welding. The engine-side outer peripheral surface 15 a of the boss 15 is fitted into the center hole 2 a of the flexible plate 2.
In the boss 15, a center hole 15c penetrating in the axial direction and a radial hole 15b communicating with the center hole 15c and communicating with the fluid space A are formed. A rivet 16 is inserted into the center hole 15c to close the center hole 15c. At the time of assembly, the fluid space A can be filled with a viscous fluid using the center hole 15c and the radial hole 15b.

A bearing 17 is arranged between the outer peripheral surface of the boss 15 on the transmission side and the inner peripheral portion of the flywheel 3. The bearing 17 supports the flywheel 3 so as to be rotatable relative to the boss 15. The inner race of the bearing 17 is fixed to the boss 15 by the groove of the boss 15 and the head of the rivet 16. Thus, boss 1
5 is positioned by the center hole 2 a of the flexible plate 2, and further positions the bearing 17. Thereby, the concentricity of the flexible plate 2, the boss 15, and the bearing 17 is improved.

In this embodiment, the thrust load and the radial load are applied to the housing 27 at the viscous resistance generating section 25.
Of the driven plate 19 and the sealing groove 19b of the driven plate 19.
7 can be reduced. Therefore, the bearing 17 can be made smaller in the radial direction. In this case, the bearing 17 is arranged in the arrangement pitch circle D of the bolts 6 (FIG. 2). Since the bearing 17 can be arranged in the pitch circle D of the bolt 6 in this manner, the degree of freedom in designing the inner peripheral side of the damping portion 4 is improved. Therefore, for example, it is possible to extend the driven plate 19 to the inner peripheral side and to arrange the coil spring 22 to the inner peripheral side. Further, a space for rotating the head of the bolt 16 can be secured. Also, the bearing 17 is inexpensive.

The bearing 17 has a seal member for sealing between the inner race and the outer race at both end surfaces. This seal member seals the lubricant between the inner race and the outer race, and seals between the boss 15 and the inner peripheral portion of the flywheel 3 in the fluid space A. The flywheel 3 has a friction surface 3a on the transmission side. In addition, friction surface 3
a projection 3d extending toward the transmission side
have. The projection 3d is formed continuously in the circumferential direction. Further, the flywheel 3 has a bearing 1 on its inner periphery.
7 which is in contact with the engine side of the outer race
have. When a load is applied to the flywheel 3 on the transmission side, the load is applied to the bearing 17.

The clutch disk assembly 202 includes a clutch disk 205 having friction facings on both sides.
An annular plate 206 having an outer peripheral end fixed to an inner peripheral end of the clutch disk 205 by a rivet 206a;
A hub flange 207 having a flange 207a fixed to the inner peripheral end of the annular plate 206 by a plurality of rivets 206b. Further, a spline hole 207b that meshes with a spline of the main drive shaft 302 is formed on the inner periphery of the hub flange 207.

The clutch pressing assembly 203 includes a plate member 211, an annular pressure plate 209 disposed on the inner peripheral side of the projection 3d, and a diaphragm spring 21.
It mainly consists of 0.

FIG. 11 and FIG.
As shown in detail in FIG. 2, it extends in an annular shape and is arranged on the outer peripheral side surface of the diaphragm spring 210.
On the inner peripheral side of the plate member 215, a plurality of inner slits 215a extending radially outward from the inner peripheral end are formed. On the outer peripheral side of the plate member 211, an outer slit 215b extending radially inward from the outer peripheral end is formed.
The inner slits 215a and the outer slits 215b are formed alternately in the circumferential direction, and both extend beyond the radially intermediate portion. Due to the slits 215a and 215b, the plate member 215 has significantly reduced rigidity in the axial direction.
The amount of deflection is increasing. An annular support portion 21 protruding toward the flywheel 3 is provided on an outer peripheral portion of the plate member 215.
5d is formed in a corresponding portion of the outer slit 215b. A plurality of protrusions 215c extending radially outward are formed on the outer peripheral end of the plate member 215. Protrusion 2
Numerals 15c are equally spaced in the circumferential direction, and are engaged with projections 3d (described later) of the flywheel 3.

A plurality of engaging portions 3e are formed at the tip of the projection 3d of the flywheel 3 in the axial direction. Engagement part 3e
Are formed at equal intervals in the circumferential direction, and each of the engagement portions 3e
The projection 215c of the plate member 215 is inserted between them, and the plate member 215 cannot rotate relative to the flywheel. A groove 3f extending in the circumferential direction is formed on the inner peripheral side of each engaging portion 3e. The outer peripheral end of the plate member 215 is inserted into the groove 3f on the engine side.
Further, a wiring 217 having a circular cross section is arranged on the transmission side in the groove 3f. In this way, the plate member 215 is
Is supported in the axial direction.

The pressure plate 209 has a pressing surface 209a on the flywheel 3 side. Further, the pressure plate 209 has a plurality of diaphragm spring detent projections 209b at circumferentially equal intervals on the side surface opposite to the pressing surface 209a. The protrusion 209b
It is fixed to the inner periphery of the plate member 215 by rivets 216. In this state, the plate member 215 elastically urges the pressure plate 209 toward the transmission.

As is apparent from FIG. 2, the diaphragm spring 210 has an annular pressing portion 210a and a large number of lever portions 21 extending radially inward from the pressing portion 210a.
0b. The outer peripheral end of the pressing portion 210a is supported on the transmission side by an annular support portion 215d of the plate member 215. That is,
The conventional clutch cover is omitted. The effects obtained by omitting the clutch cover are as follows. (A) The number of parts is reduced, and as a result, the cost is reduced. (B) The axial dimension is reduced. (C) Since there is no need to provide a clutch cover mounting portion on the outer peripheral portion of the flywheel, the friction facing of the clutch disc can be increased in the radial direction. (D) The outer diameter of the diaphragm spring can be increased. (E) The heat radiation of the pressure plate is improved.

The inner peripheral end of the pressing portion 210a urges the pressure plate 209 toward the engine. Lever part 21
0b is engaged with the release device 204. A hole 210c is formed between the base (outer peripheral side) of the lever portion 210b of each diaphragm spring 210. The pressure plate 209b is provided every other hole 210c.
Projecting portion 209b penetrates.

As described above, the plate member 215 that functions as a conventional strap plate is formed by the pressure plate 209 and the diaphragm spring 21.
0 on the transmission side. For this reason, attachment and detachment of the plate member 215 are facilitated. As a result, the clutch disc assembly 20
2 can be easily replaced.

Further, in this embodiment, the plate member 2
15 is fixed to the projection 209b of the pressure plate 209 and the projection 3d of the flywheel 3, so that a projection for a plate member is provided on the pressure plate as in the related art, or the fixed portion is fixed to the projection 3b of the flywheel 3. There is no need to form. As a result, the processing of each part is facilitated, and the manufacturing cost is reduced.

Further, since the plate member 21 is an annular one-piece, it can uniformly apply a biasing force to the pressure plate 209 in the circumferential direction. The release device 204 includes a lever portion 2 of the diaphragm spring 210.
Lever plate 218 abutting on the engine side of 10b
A release bearing 217 fixed to the inner periphery of the lever plate 218; a first cylindrical member 219 to which the inner peripheral end of the release bearing 217 is mounted;
And a second cylindrical member 220 partially inserted into and fixed to the inside of the housing 19. When the second cylindrical member 220 is moved toward the transmission by a device (not shown), the lever plate 218 pulls out the lever portion 210 b of the diaphragm spring 210 toward the transmission, and releases the pressure of the diaphragm spring 210 against the pressure plate 209.

Next, the operation will be described. When torque is input from the crankshaft 301 to the flexible plate 2, the torque is transmitted to the driven plate 19 via the ring member 8, the first input side plate 13, the second input side plate 14, and the coil spring 22. . The torque transmitted to the driven plate 19 is further transmitted to the flywheel 3 and transmitted to the main drive shaft 302 via the clutch disk assembly 202. The pressure plate 209 rotates integrally with the flywheel 3 via the plate member 215.

From the crankshaft 301 to the ring member 8
The bending vibration included in the torque transmitted to is suppressed by the flexible plate 2 and is not easily transmitted to the damping portion 4 side. Even if the bending vibration is transmitted, the bending load is shared and supported by the bearing 17, the engagement portion between the annular protrusion 27b of the housing 27, and the sealing groove 19b of the driven plate 19. Therefore, the bearing 17
Therefore, the bearing 17 can be downsized in the radial direction.

When the release device 204 is moved to the transmission side, the diaphragm spring 210
Of the pressure plate 209 is released. Then, the pressure plate is separated from the flywheel 3 by the urging force of the plate member 215. As a result, the clutch disk 205 separates from the friction surface 3a of the flywheel 3. At this time, the release load also acts on the flywheel 3 to apply a thrust load to the bearing 171. However, since the flywheel 3 is fixed by the driven plate 19 and the rivets 20, the load applied to the flywheel 3 is annular. Annular protrusion 27 of housing 27
b and the bearing 17 share and support it. Therefore, the load on the bearing 17 is reduced, and
Can be reduced in the radial direction, and an inexpensive bearing can be used.

Next, the operation of the flywheel assembly 1 when torsional vibration is transmitted from the crankshaft 301 to the flywheel assembly 1 will be described. However,
Here, the operation when the torsional vibration is transmitted is performed by fixing the output side mechanism (the driven plate 19 and the flywheel 3) to another member (not shown) in a non-rotatable manner. 1st input side plate 13, 2nd
The operation will be described by replacing the operation when the input side plate 14 and the annular housing 27) are twisted.

First, a torsional vibration (hereinafter referred to as a minute vibration) having a small deviation angle in which the circumferential wall of the slide stopper 29 does not abut on the projection 19 d of the driven plate 19.
The operation when is transmitted will be described. Annular housing 27 and twisted R ₂ side in a free state shown in FIG. Then, the slide stopper 29 is moved to the R ₂ side, FIG. 6
As shown in (1), the first small compartment 33 is expanded and the second small compartment 34 is reduced in the slide stopper 29. The viscous fluid flows freely from the second sub-compartment 34 to the first sub-compartment 33 between the outer periphery of the slide stopper 29 and the projection 19d and through the return hole 27c. Further, the viscous fluid can flow back and forth between the inside of the slide stopper 29 and the annular space A through the return hole 27c without a large resistance.

[0050] Continuing further torsional operation from the state of FIG. 6, finally circumferential wall portion of the R ₁ side in the slide stopper 29 as shown in FIG. 7 comes into contact with the projection 19d of the driven plate 19. Thereafter, the slide stopper 29 is locked by the driven plate 19, and relative rotation occurs between the annular housing 27 and the slide stopper 29. In the state shown in FIG.
Although the Oita chamber 32 communicates with the return hole 27c, as the twisting operation proceeds further, the return hole 27c is closed by the projection 19d as shown in FIG.

From the free state shown in FIG.
7 is an operation similar to that also described above when twisted R ₁ side is performed. Slide stopper 29 for micro vibration
Second rotation because there is no relative rotation between
The Oita chamber 32 is not reduced, and the viscous fluid does not pass through the choke portion C. That is, large viscous resistance does not occur at the time of minute vibration. Further, the coil spring 22 is extended and contracted in a state of being biased against the window hole 19a of the driven plate 19 and the spring accommodating portions 13a, 14a of the input side plates 13, 14. Therefore, a low rigidity state is obtained. That is, in the case of minute vibration, characteristics of low rigidity and small viscous resistance are obtained, and generation of abnormal noise such as rattling noise and muffled noise of the transmission is effectively suppressed.

Next, an operation when a torsional vibration having a large deflection angle (hereinafter referred to as a large vibration) is transmitted will be described. From the free state shown in FIG.
It is assumed that 7 starts twisting toward the R ₂ side with respect to the driven plate 19. Then, the slide stopper 29 is moved to the R ₂ side, as in the case of small vibration performs the operation of FIGS. 5 to 8. When R ₂ of the second Oita chamber 32 as shown in FIG. 8 is sealed state between the projection 19d of the slide stopper 29 and the driven plate 19, second Oita chamber 32 begins to be reduced. As a result, the viscous fluid is arcuate fluid chamber R ₁ side through the choke portion C in the second Oita chamber 32 B
_Flow to _one . When the viscous fluid flows through the choke portion C, a large viscous resistance is generated. In addition, the viscous fluid flows smoothly from the fluid space A into the first Oita chamber 31 through the return hole 27c.

[0053] from the position shown in FIG. 10, the housing 27 is twisted in the R ₁ side, passes through the neutral position, performs 10 and reverse operation. As described above, a large viscous resistance is obtained during a large vibration. Moreover, when the torsion angle increases, the seat member 23 of the coil spring 22
Rigidity is increased because the entire end of the spring 9a and the ends of the spring accommodating portions 13a and 14a come into contact with each other. In other words, in the case of large vibration, characteristics of high rigidity and large viscous resistance are obtained, and vibration at the time of tip-in and tip-out (a large swing of the vehicle body caused by sudden operation of the accelerator pedal) can be effectively prevented. Can be attenuated.

As shown in FIG.
There is a small vibration in a state of twisted constant angle R ₂ side with respect to the driven plate 19 is transmitted. Then, the slide stopper 29 repeats the reciprocating twisting operation with respect to the projection 19d within the angular range where the circumferential wall portion contacts the projection 19d. At this time, the viscous fluid does not flow through the choke portion C and does not generate a large viscous resistance. That is, even if the torsion angle between the annular housing 27 and the driven plate 19 is large, the minute vibration can be effectively absorbed.

[0055]

In the clutch pressing assembly according to the present invention,
The plate member is arranged on the side opposite to the pressing surface of the pressure plate. Therefore, when removing the pressure plate from the flywheel, the plate member can be easily removed. As a result, replacement of the clutch disk assembly is facilitated. Also, the plate member has multiple slits
Formed, reducing the axial rigidity of the plate member.
You.

When the plate member has a supporting portion for supporting the pressing member, the conventional clutch cover can be omitted, so that the number of parts can be reduced and the cost can be further reduced. Also, if the clutch cover can be omitted, the outer diameter of the clutch disc can be increased,
The friction surface of the clutch can be made larger. Further, the axial dimension of the entire assembly can be reduced.

When the plate member is an annular plate,
The urging force on the pressure plate can be made uniform in the circumferential direction. Slit plate member, if extending alternately radially from the outer peripheral edge and an inner peripheral edge, it is possible to further reduce the axial stiffness of the plate member.

When the inner peripheral end of the plate member is fixed to the pressure plate projecting portion penetrating through the hole of the pressing member, it is not necessary to particularly form a portion for fixing the plate member to the pressure plate. As a result, the processing of the pressure plate becomes easy, and the manufacturing cost can be reduced.

When the outer peripheral end of the pressing member is supported by the support portion of the plate member, and the radially intermediate portion presses the pressure plate toward the flywheel, the above-described operation is further effective.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a power transmission device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the power transmission device as viewed from the transmission side.

FIG. 3 is a partially cutaway front view of the power transmission device as viewed from the engine side.

FIG. 4 is an enlarged partial view of FIG. 1;

FIG. 5 is an enlarged partial view of FIG. 2;

FIG. 6 is a view corresponding to FIG. 5, showing one state of a twisting operation.

FIG. 7 is a view corresponding to FIG. 5, showing one state of a twisting operation.

FIG. 8 is a view corresponding to FIG. 5, showing one state of the twisting operation.

FIG. 9 is an enlarged partial view of FIG. 2;

FIG. 10 is a view corresponding to FIG. 9, showing one state of the twisting operation.

FIG. 11 is a partially cutaway front view of the power transmission device as viewed from the engine side.

FIG. 12 is a partial cross-sectional perspective view of a power transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flywheel assembly 2 Flexible plate 3 Flywheel 3a Friction surface 3d Projection 4 Damping part 201 Power transmission device 202 Clutch disk assembly 203 Clutch pressing assembly 209 Pressure plate 210 Diaphragm spring 215 Plate member

Claims (4)

(57) [Claims] 1. A flywheel having a friction surface and connected to an input-side rotating body, and a clutch disk assembly having a clutch disk capable of contacting the friction surface and connected to an output-side rotating body. A clutch pressing assembly provided on a clutch device for pressing and releasing the clutch disk against the friction surface, the pressure plate having a pressing surface for pressing the clutch disk against the friction surface; A pressing member for pressing a pressure plate against the friction surface; and a pressing member disposed on a side of the pressure plate opposite to the pressing surface, for connecting the flywheel and the pressure plate so that they cannot rotate relatively and elastically deforming in the axial direction. The pressure plate is released when the pressing of the pressure plate by the pressing member is released. Comprising a plate member providing a biasing force to separate the over bets from the flywheel to the pressure plate, and has a plurality of slits is formed in the plate member
A clutch pressing assembly. 2. An outer peripheral portion of the plate member,
It is fixed to the wheel and the inner periphery is the pressure plate
The annular plate according to claim 1, wherein the annular plate is fixed to the annular plate.
Clutch pressing assembly. 3. The slit of the plate member has an outer periphery.
3. The structure of claim 2, wherein the end extends radially alternately from the end and the inner peripheral end.
4. The clutch pressing assembly according to claim 1. 4. A disc-shaped bullet having a plurality of holes.
Material, The pressure plate extends through the plurality of holes and has a shaft.
Projection projecting in the direction Has, The inner peripheral end of the plate member is fixed to the protrusion.
The clutch pressing assembly according to claim 2 or 3, wherein the clutch is pressed.
body.