JPH11325111A - Clutch cover assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock a cushion member in a clutch cover assembly in which a spring having the cushioning function is arranged on a diaphragm spring side. SOLUTION: A clutch cover assembly 3 is provided with a clutch cover 16, a pressure plate 17, a cushion member 37, diaphragm springs 29, 30, and a pin 38. The pressure plate 17 is arranged on clutch disks 42, 43 side of the clutch cover 16, and has a first surface 36a on the clutch disks 42, 43 side and a second surface 36b on the clutch cover 16 side. The cushion member 37 is arranged on the second surface 36b side of the pressure plate 17. The diaphragm springs 29, 30 are supported by the clutch cover 16 to urge the pressure plate 17 to the clutch disks 42, 43 side through the cushion member 37. The pin 38 is provided on a second surface 37b of the pressure plate 17 to lock the cushion member 37 and the diaphragm springs 29, 30 relative to the pressure plate 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch cover assembly, and more particularly to a clutch cover assembly having a cushion member forming a fulcrum of a diaphragm spring.

[0002]

2. Description of the Related Art A clutch cover assembly is mounted on a flywheel of a vehicle, and a clutch is connected by pressing a friction facing of a clutch disc assembly against a friction surface of a flywheel, or is attached by a driver's operation of a clutch pedal. The clutch is disengaged by releasing the power.
The clutch cover assembly mainly includes a clutch cover, a diaphragm spring, and a pressure plate. The clutch cover is a disk-shaped or annular member fixed so that an outer peripheral portion thereof rotates integrally with the flywheel. The clutch cover has an annular portion which is axially separated from the flywheel by a predetermined distance. The pressure plate is an annular member, and is disposed between the friction surface of the flywheel and the clutch cover and close to the clutch cover side. The pressure plate is fixed to the clutch cover by, for example, a strap plate, and rotates integrally with the clutch cover. The diaphragm spring is a disc-shaped spring member, and has an annular elastic portion and a plurality of lever portions extending radially inward from the elastic portion. The inner peripheral end or the outer peripheral end of the elastic portion is supported by the clutch cover, and the opposite end is supported by the pressure plate. The elastic portion is compressed in the axial direction between the clutch cover and the pressure plate, and applies an urging force to the pressure plate on the flywheel friction surface side.

[0003]

Problems to be Solved by the Invention
In the clutch cover assembly shown in No. 6, a spring having a cushion function is arranged between the back surface of the pressure plate and the diaphragm spring. In this clutch disk assembly, the spring having the cushion function is less susceptible to the heat generated on the friction surface of the pressure plate.

However, since this spring is not stopped against the pressure plate and the diaphragm spring, abrasion easily occurs between the spring and both members due to sliding. SUMMARY OF THE INVENTION It is an object of the present invention to provide a clutch disc assembly in which a spring having a cushioning function is arranged on a diaphragm spring side to prevent a cushion member from rotating.

[0005]

According to a first aspect of the present invention, there is provided a clutch cover assembly for connecting a clutch between an input rotary body and an output rotary body by pressing a friction member. The clutch cover assembly includes a clutch cover, a pressure plate, a diaphragm spring, and a detent member. The clutch cover is configured to rotate integrally with the input rotating body, and faces the friction member in the axial direction. The pressure plate is disposed on the friction member side of the clutch cover, and has a first surface on the friction member side and a second surface on the clutch cover side. The cushion member is disposed on the second surface of the pressure plate. The diaphragm spring is supported by the clutch cover, and urges the pressure plate toward the friction member via the cushion member. The detent member is provided on the second surface of the pressure plate, and detents the cushion member and the diaphragm spring against the pressure plate.

In the clutch cover assembly according to the first aspect, the cushion member and the diaphragm spring are prevented from rotating with respect to the pressure plate by the rotation preventing member. As a result, the cushion member does not rotate relative to the pressure plate and the diaphragm spring, and wear between the members hardly occurs. In particular, since the two members, the diaphragm spring and the cushion member, are prevented from rotating together by the rotation preventing member on the pressure plate, the number of parts is reduced.

According to a second aspect of the present invention, in the clutch cover assembly according to the first aspect, the detent member extends axially from the second surface of the pressure plate and rotationally engages with the cushion member and the diaphragm spring. ing. In the clutch cover assembly according to a third aspect, in the second aspect, the detent member is a pin having one end inserted into a hole formed in the second surface of the pressure plate.

In the clutch cover assembly according to the fourth aspect, in any one of the first to third aspects, the cushion member is partially supported by the second surface of the pressure plate,
The other portion is disposed with a gap in the axial direction with respect to the second surface, and is configured to be biased by the diaphragm spring. In the clutch cover assembly according to the fifth aspect, in the fourth aspect, the cushion member is a disk-shaped member.

[0009]

1 and 2 are a sectional view and a plan view, respectively, of a clutch 1 according to an embodiment of the present invention. 2 is the rotation axis of the clutch 1, and FIG.
R1 is the rotation direction of the clutch 1. The clutch 1 is disposed between the vehicle engine and the transmission,
It has a clutch function of transmitting torque between the two and interrupting the torque. In particular, the clutch 1 is a twin clutch having two clutch disk assemblies 40 and 41 (described later), and is used, for example, in a racing vehicle. However, the following description can be applied to a single-disc clutch or a multiple-disc clutch having five or more frictional engagement surfaces as necessary.

The clutch 1 is mainly composed of a flywheel 2
, A clutch cover assembly 3 and a clutch disc assembly 4. The flywheel 2 is a disc-shaped member having a center hole formed therein. The flywheel 2 is formed of, for example, cast iron or steel. Flywheel 2
Has an inner peripheral portion fixed to a crankshaft (not shown) by a plurality of bolts 6. Thus, the flywheel 2 functions as an input rotating body in the clutch 1. Holes 2 a (unthreaded holes) through which the bolts 6 pass are formed in the inner peripheral portion of the flywheel 2 so as to be aligned in the circumferential direction. An annular groove 2b is formed on the outer peripheral portion of the flywheel 2 on the transmission side. A plurality of unthreaded holes 2c penetrating in the axial direction are formed in the groove 2b along the circumferential direction. A friction surface 7 facing the transmission side is formed on the inner peripheral side of the groove 2b. The friction surface 7 is a flat surface formed in an annular shape.

A boss 9 is arranged on the transmission side of the outer periphery of the flywheel 2. The boss 9 is a member for fixing the flywheel 2 and the clutch cover assembly 3 (described later), and is a member for transmitting torque to the pressure plate 17 and the intermediate plate 44 as members on the input side. The boss 9 is formed of, for example, an aluminum casting. The boss 9 includes an annular portion 10 and an annular portion 1.
And a plurality of pillar portions 11 (engaging portions) extending from 0 to the transmission side in the axial direction. The annular portion 10 is an annular member having a predetermined width in the radial direction and a low axial height. The annular portion 10 is seated in the groove 2b of the flywheel 2. The outer peripheral surface of the annular portion 10 contacts the outer peripheral wall of the groove 2b,
As a result, the boss 9 is positioned in the radial direction with respect to the flywheel 2. A plurality (six in this embodiment) of column portions 11 are formed in a circumferential direction. The pillar portions 11 are elongated in the axial direction, and a gap larger than the circumferential width of the pillar portions 11 is secured between the pillar portions 11 in the circumferential direction. As shown in FIG. 2, the column portion 11 has a substantially rectangular cross section, and the circumferential end surface 11a forms a flat surface. The inner peripheral surface and the outer peripheral surface of the column portion 11 are arcuate in the circumferential direction. A bolt hole 12 penetrating through the pillar portion 11 and the annular portion 10 is formed in a portion corresponding to each pillar portion 11. Screw holes are formed in the bolt hole 12 on both sides in the axial direction. The boss 9 is fixed to the flywheel 2 by a plurality of bolts 13. The bolt 13 passes through the hole 2 c of the flywheel 2 from the engine side of the flywheel 2 and is further screwed into the bolt hole 12 of the boss 9.

The clutch cover assembly 3 has a function of applying a biasing force so that the clutch disc assembly 4 rotates integrally with the flywheel 2 and releasing the clutch connection by releasing the biasing force by a driver's operation. Have. The clutch cover assembly 3 includes a clutch cover 16.
, A pressure plate 17, and a diaphragm spring assembly 18. The clutch cover assembly 3 is a pull-type clutch that releases the inner peripheral edge of the diaphragm spring assembly 18 toward the transmission to release the clutch. Note that the clutch cover assembly 3 is disposed so as to rotate integrally with the flywheel 2.

The clutch cover 16 is an annular disk-shaped member. The clutch cover 16 includes a disc-shaped outer peripheral portion 23,
The tubular portion 24 includes an inner peripheral portion 25 extending from the inner peripheral side of the outer peripheral portion 23 toward the transmission in the axial direction, and a disk-shaped inner peripheral portion 25 extending from the end of the cylindrical portion 24 toward the inner side toward the transmission side. The engine side surface of the outer peripheral portion 23 is in contact with the transmission-side end surface of the column portion 11 of the boss 9. An annular projection protruding toward the engine is formed on the outer peripheral edge of the outer peripheral portion 23, and the inner peripheral surface of the annular projection is in contact with the outer peripheral surface of each column portion 11. Thereby, the clutch cover 16
Are positioned in the radial direction with respect to the boss 9. As a result, the clutch cover 16 is centered (positioned in the radial direction) with respect to the flywheel 2 via the boss 9. The outer peripheral portion 23 is fixed to the column portion 11 by a plurality of bolts 27. An unthreaded hole 28 corresponding to the bolt hole 12 is formed in the outer peripheral portion 23. The bolt 27 is inserted into the hole 28 from the transmission side and screwed into the bolt hole 12. The inner peripheral portion 25 faces the friction surface 7 of the flywheel 2 with an interval in the axial direction.

The pressure plate 17 is arranged between the clutch cover 16 and the flywheel 2 and close to the clutch cover 16. The pressure plate 17 is an annular or disk-shaped member, and the annular body 36 has a first surface 36 a facing the friction surface 7 and a second surface 36 b facing the inner peripheral portion 25 of the clutch cover 16. ing. The first surface 36a is an annular and flat friction surface. An engagement portion 39 is formed on the outer peripheral side of the annular main body 36 of the pressure plate 17. The engagement portion 39
It extends radially outward from the annular body 36 and extends axially between the annular portion 10 of the boss 9 and the outer peripheral portion 23 of the clutch cover 16.
And it is located between each pillar part 11 in the circumferential direction. The engaging portion 39 extends long in the circumferential direction. As shown in FIG. 2, the engaging portion 39 has circumferential end faces 11 a of the column portion 11 at both ends in the circumferential direction.
Has a contact surface 39a that comes into contact with. Due to the engagement between the contact surface 39a and the circumferential end surface 11a, the pressure plate 17 rotates integrally with the boss 9 and is movable in the axial direction. Thus, the pressure plate 1
7, the torque of the flywheel 2 is input. In addition,
The pressure plate 17 is not directly fixed or engaged with the clutch cover 16.

The cushion member 37 is disposed on the second surface 36b side of the annular main body 36 of the pressure plate 17. The cushion member 37 is a member for realizing a cushion function when the clutch is engaged. An annular groove 61 is formed on the inner peripheral side of the second surface 36b. The annular groove 61 is further lower than the outer peripheral second surface 36b.
A cylindrical portion 63 extending in the axial direction is formed on the inner peripheral edge of the annular groove 61. The cylindrical portion 63 includes the annular groove 61 and the second surface 36.
b further extends toward the transmission in the axial direction. On the inner peripheral side of the cylindrical portion 63, an annular support portion 62 that projects further in the axial direction than the annular groove 61 is formed. The support part 62 has a curved cross section.

The cushion member 37 is an annular or disk-shaped member as shown in FIG. Cushion member 37
Is a leaf spring, and in this embodiment, has a disk shape, that is, a washer shape. The inner peripheral portion of the disk-shaped portion 37 a constituting the cushion member 37 is supported by the pressure plate 17 by the support portion 62. In addition, the disk-shaped portion 37
The inner peripheral edge of “a” is close to the cylindrical portion 63, and the cushion member 37 is positioned in the radial direction by the cylindrical portion 63. On the outer peripheral edge of the cushion member 37, an annular fulcrum 37b protruding toward the transmission in the axial direction is formed. In the clutch disengaged state, the disc-shaped portion 37a maintains a substantially flat shape so as to extend substantially parallel to the annular groove 61. With the above structure, a bending allowance T is secured between the disc-shaped portion 37a and the annular groove 61 in the axial direction.

The diaphragm spring assembly 18 (biasing member) is a spring that is supported by the clutch cover 16 and applies a biasing force to the pressure plate 17. The diaphragm spring assembly 18 includes two diaphragm springs. Here, two diaphragm springs are used because a large urging force is required in the multi-plate clutch. The diaphragm spring assembly 18 includes a first diaphragm spring 29 and a second diaphragm spring 30.

The first diaphragm spring 29 (first disc-shaped elastic member) includes an annular first elastic portion 31 and a plurality of first lever portions 3 extending radially inward from the first elastic portion 31.
And 3. The engine side surface of the inner peripheral portion of the first elastic portion 31 is in contact with or close to the fulcrum portion 37 b of the cushion member 37. The first lever portion 33 extends near the rotation axis OO of the clutch 1. Each first lever 33
Have slits between them, and have a narrow width in the circumferential direction toward the radial end. Further, the distal end 35 of the first lever portion 33 has a portion that is bent obliquely from the middle toward the transmission and further extends flat.
That is, the distal end 35 of the first lever portion 33 is at an axial position different from the inner peripheral portion thereof. A release device 19 (engaging member) including a lever plate, a wiring, a wedge collar, and the like is attached to the distal end 35 of the first lever portion 33. Radial tips 35 of the plurality of first lever portions 33
Is located at a predetermined position from the center, so that the first
A center hole is formed in the diaphragm spring 29.

Near the root of each first lever 33 (outer periphery)
An oval hole 33a having a large width is formed by a slit between the first lever portions 33. The oval hole 33a is an oval hole extending long in the radial direction, and the outer circumferential side width of each of the first lever portions 33 is smaller than the inner circumferential side portion of the first lever portion 33 by the oval hole 33a. The second diaphragm spring 30 is disposed concentrically on the axial transmission side of the first diaphragm spring 29. The second diaphragm spring 30 is disposed in contact with the first diaphragm spring 29, and is urged by the first diaphragm spring 29 to be separated from the pressure plate 17 when the clutch is released. The second diaphragm spring 30 includes a second elastic portion 32 and a second elastic portion 32.
And a plurality of second lever portions extending radially inward from the second lever portion. The second elastic part 32 is arranged so as to overlap with the first elastic part 31. Each of the second lever portions 34 has a slit therebetween, and each of the second lever portions 34 has a circumferentially narrower width toward the radial end. The second lever portion 34 is formed corresponding to the first lever portion 33, and the first lever portion 3
3 are arranged so as to overlap each other. Multiple second
The distal end of the lever portion 34 in the radial direction is arranged at a predetermined position from the center, and therefore, the second diaphragm spring 3
0 means that a center hole is formed. The second lever portion 34 is shorter than the first lever portion 33, and does not extend radially inward beyond the flat portion of the first lever portion 33. Thus, the center hole (second center hole) of the second diaphragm spring 30 has a larger radius than the center hole (first center hole) of the first diaphragm spring 29. In other words, the inside diameter of the second diaphragm spring 30 is larger than that of the first diaphragm spring 29. The outer diameter of the first diaphragm spring 29 is equal to the outer diameter of the second diaphragm spring 30.

Near the root of each second lever portion 34 (outer periphery)
Is formed with an oval hole 34a wider than the slit between the second lever portions 34. The oval hole 34a is an oval hole extending long in the radial direction, and the outer circumferential side width of each of the second lever portions 34 is smaller than the inner circumferential portion thereof by the oval hole 34a. The oval hole 34a corresponds to the oval hole 33a and has the same shape.

A wiring 20 is arranged between the outer peripheral side surface of the second elastic portion 32 of the second diaphragm spring 30 and the outer peripheral side surface of the inner peripheral portion 25 of the clutch cover 16. Wiring 20
Is a member having a circular cross section, and constitutes a fulcrum on the clutch cover 16 side with respect to the diaphragm spring assembly 18. The wiring 20 is in contact with the inner peripheral surface of the cylindrical portion 24, thereby performing positioning in the radial direction. In the above structure, the outer peripheral portions (the axial transmission side surface, the second surface) of the first and elastic portions 31 and 32 are supported by the clutch cover 16, and the inner peripheral portion (the axial engine side, that is, the clutch cover 16 side surface, the first Surface) is supported by the pressure plate 17 via the cushion member 37. An annular or arc-shaped support portion is provided on the clutch cover 16 instead of the wiring 20, and the clutch cover 16 is directly connected to the diaphragm spring assembly 18.
May be supported.

First and second diaphragm springs 2
1 are flat in FIG. 1, but have a conical shape in a free state (a state in which the clutch cover assembly 3 is detached from the clutch 1). More specifically, the first and second diaphragm springs 29 and 30 have inner peripheral portions, that is, tips of the first and second lever portions 33 and 34 at outer peripheral portions, that is, the first and second elastic portions 31 and 32 of the clutch cover 16. It is located in a direction away from the inner peripheral portion 25. In this state, the first and second diaphragm springs 29, 3
0 is movable in the axial direction with respect to the clutch cover 16, but the side away from the inner peripheral portion 25 is supported by the circlip 21. That is, the first and second diaphragm springs 29 and 30 are prevented from falling off the clutch cover 16 by the circlip 21.

When the clutch cover assembly 3 shown in FIG. 1 is attached to the clutch 1, the first and second elastic portions 31, 32 are arranged between both members in the axial direction in a state of being deformed in the axial direction. I have. Specifically, in the clutch release state, the inner peripheral portions of the first and second diaphragm springs 29 and 30 are pulled out toward the transmission, and no urging force is applied to the pressure plate 17 side. In the clutch connected state, the outer peripheral transmission side of the first and second elastic portions 31 and 32 is supported by the clutch cover 16 (via the wiring 20 in this embodiment), and the inner peripheral engine side is supported by the pressure plate 17 (cushion member). (Via 37). As a result, the first and second elastic portions 31 and 32 are connected to the pressure plate 1.
7 is applied to the flywheel 2 toward the friction surface 7 side. The first elastic portions 31 and 32 are acting in parallel, and the entire urging force is the sum of the individual urging forces of the first and elastic portions 31 and 32.

The circlip 21 (locking member) is disposed on the engine side of the elastic portions 31 and 32 in the axial direction, and prevents the diaphragm spring assembly 18 from coming off the clutch cover 16 in the axial direction. The circlip 21
More specifically, it is provided on the inner peripheral side of the cylindrical portion 24 of the clutch cover 16 and on the engine side in the axial direction. The circlip 21 is a member extending in an annular shape, and a part thereof is cut off. The circlip 21 is inserted into a groove formed in the tubular portion 24. Circlip 21 and elastic portion 31
A predetermined gap is secured in the axial direction between them. This gap prevents the circlip 21 from interfering with the diaphragm spring assembly 18 in a state where the clutch cover assembly 3 is incorporated in the clutch 1.

A plurality of pins 38 (rotation stop members) extending in the axial direction are attached to an inner peripheral portion of the pressure plate 17, that is, a portion corresponding to the annular groove 61. The pin 38 is a cylindrical member, and has a slit extending in the axial direction. One end of the pin 38 is tightly fitted in a hole 36 c formed in the pressure plate 17, extends through the hole 37 c formed in the cushion member 37, and further has an oval hole 33 a formed in the first and second diaphragm springs 29 and 30. , 34a. The diameter of the pin 38 is substantially equal to the circumferential length of the hole 37c of the cushion member 37, and both ends of the pin 38 are in contact with the hole 37c of the cushion member 37 in the circumferential direction.
Thereby, the cushion member 37 rotates integrally with the pressure plate 17. The diameter of pin 38 is oval hole 33
a, 34a, which is shorter than the circumferential width,
There are two types of oval holes 33a and 34a that abut on the rotation direction R1 side, and those that oval holes 33a and 34a abut on the rotation direction R2 side. Thus, the diaphragm spring assembly 18 rotates integrally with the pressure plate 17.

As described above, the cushion member 37 and the diaphragm spring assembly 18 are integrally rotated with the pressure plate 17 by the plurality of pins 38. For this reason, relative rotation between the members is eliminated, and wear is less likely to occur. In particular, 2
Since two members are prevented from rotating with respect to the pressure plate, the number of parts is greatly reduced.

The clutch disk assembly 4 includes a first clutch disk assembly 40 and a second clutch disk assembly 4.
And 1. The first clutch disc assembly 40 is disposed on the engine side in the axial direction with respect to the second clutch disc assembly 41. The clutch disk 42 (first friction member) of the first clutch disk assembly 40 is arranged close to the friction surface 7 of the flywheel 2.
Clutch disk 4 of second clutch disk assembly 41
The 3 (second friction member) is arranged near the first surface 36 a of the annular main body 36 of the pressure plate 17. Each of the clutch discs 42 and 43 is provided with a friction facing on both surfaces, and functions as an output friction member of the clutch 1. First and second clutch disk assemblies 4
Numerals 0 and 41 have torsional vibration dampers made of a torsion spring or the like. The first and second clutch disc assemblies 40, 41 also have hubs that engage a shaft (not shown) extending from the transmission.
Thereby, the clutch disk assembly 4 functions as an output rotating body of the clutch 1.

An intermediate plate 44 (friction engagement member) is disposed between the clutch disks 42 and 43 in the axial direction. The intermediate plate 44 functions as an input friction member that rotates integrally with the flywheel 2. The intermediate plate 44 is an annular member, and has an annular and flat friction surface on both axial sides. Annular main body 4 mainly constituting an intermediate plate
5 has a plurality of protrusions 46 extending outward in the radial direction. The protruding portion 46 extends further radially outward than the clutch disks 42 and 43, and extends between the annular portion 10 of the boss 9 and the outer peripheral portion 23 of the clutch cover 16 in the axial direction and between the column portions 11 in the circumferential direction. positioned. The protruding portion 46 extends long in the circumferential direction, and the engaging portions 5 are provided at both ends in the circumferential direction.
1 is formed. The engaging portion 51 is a pillar portion 11 of the boss 9.
, And are engaged so as to be relatively non-rotatable and movable in the axial direction. Specifically, a circumferential end face 51 a formed on the engaging portion 51 is in contact with the circumferential end face 11 a of the column portion 11 from the circumferential direction.

A hole 47 extending in the radial direction is formed in the annular main body 45. The hole 47 is formed corresponding to the protrusion 46. For this reason, the inside of the clutch 1 is communicated with the outside through a gap between the hole 47 and the column portion 11 located radially outward. Therefore, the inside of the clutch 1 is cooled by the air flowing radially outward due to the centrifugal force.

The projecting portion 46 has springs 5 on both sides in the axial direction.
0 is provided respectively. The spring 50 is an elastic member fixed to the intermediate plate 44 and for maintaining the intermediate plate 44 at a predetermined axial intermediate position between the flywheel 2 and the pressure plate 17 at the time of clutch release. Due to the spring 50, drag torque due to the intermediate plate 44 being shifted toward one side in the axial direction in the clutch disengaged state is less likely to occur.

The spring 50 is a leaf spring, and includes a first portion 52 (fixed portion) extending in the circumferential direction, and a second portion 53 (elastic portion) extending in the axial direction from both circumferential ends of the first portion 52. ,
And a bent portion 54 bent from the front end of the second portion 53 to the opposite side in the axial direction. First part 52
Abuts on the axial end surface of the protrusion 46 and is fixed to the protrusion 46 by two pins 55. Each pin 55 fixes the spring 50 on both sides in the axial direction. Second part 5
Reference numeral 3 extends obliquely from the axial end surface of the protrusion 46. The bent portion 54 has a protrusion 46 at the tip of the second portion 53.
The contact surface is bent to the side and curved in a convex shape on the side opposite to the protrusion 46. Spring 50 on axial engine side
, The contact surface is in contact with the axial transmission side surface of the annular portion 10 of the boss 9. Further, the contact surface of the spring 50 on the axial transmission side is in contact with the axial engine side surface of the engaging portion 39 of the pressure plate 17. The spring 5 in the clutch connection state and the connection release state
The zero second portion 53 and the bent portion 54 maintain a state of being compressed in the axial direction.

In this clutch 1, between the friction surface 7 of the flywheel 2 and the clutch disk 42, between the clutch disk 42 and the intermediate plate 44,
Between the clutch disk 43 and the clutch disk 43
And a first surface 36a of the pressure plate 17 is provided with a friction engagement surface. Next, the operation of the clutch 1 will be described.

When the driver depresses the clutch pedal, the release device 19 is pulled out to the right in FIG. 1, that is, toward the axial transmission, whereby the lever portion 33 of the first diaphragm spring 29 is moved toward the axial transmission. Have been. At this time, the second diaphragm spring 30 is moved by the first diaphragm spring 29 toward the transmission in the axial direction. In this state, the diaphragm spring assembly 1
The urging force from No. 8 is not applied to the pressure plate 17, and the cushion member 37 maintains the flat state shown by the solid line in FIG. Further, since no urging force is applied to the pressure plate 17, the first and second
The clutch disks 42, 43 of the clutch disk assemblies 40, 41 are separated from the flywheel 2, the intermediate plate 44 and the pressure plate 17. As a result, the torque of the flywheel 2 is not transmitted to the clutch disk assembly 4. At this time, the intermediate plate 44 is maintained at a predetermined position in the axial direction between the flywheel 2 and the pressure plate 17 by the spring 50 fixed to the intermediate plate 44. As a result, drag torque due to the contact of the intermediate plate 44 with the clutch disks 42 and 43 toward one side in the axial direction hardly occurs.

When the driver releases the clutch pedal, the first and second diaphragm springs 29, 30 in the diaphragm spring assembly 18 attempt to return to their original state. That is, the outer peripheral portions of the first and second elastic portions 31 and 32 are
Gives bias to In the initial stage of the clutch connection operation, the cushion member 37 is elastically deformed from a solid line state to a wavy line state as shown in FIG. That is, the fulcrum portion 37b
Is pressed by the first diaphragm spring 29, and the outer peripheral portion of the cushion member 37 is pressed against the annular groove 61 side of the pressure plate 17. Due to the elastic deformation of the cushion member 37 at this time, a cushion function at the time of the clutch connection operation is obtained.

After the deformation of the cushion member 37, the pressure plate 17 moves to the engine side, and the clutch disks 42, 43 and the intermediate plate 44 are connected to the flywheel 2.
Is pressed against the friction surface 7. As a result, the first and second
Torque is input to the clutch disk assemblies 40 and 41 from the flywheel 2, the boss 9, and the pressure plate 17. [Effects of Cushion Member 37] The cushioning effect is obtained by deforming the cushion member 37 in the axial direction during the clutch engagement operation. During the clutch release operation, the load from the cushion member 37 acts in the clutch release direction, so that the release load decreases. As a result, the operability of the half clutch operation is improved.

In the cushion member 37, the rigidity and deflection allowance of the cushion member can be arbitrarily set, that is, the cushion characteristics can be arbitrarily set.
Thus, the degree of freedom in setting the half-clutch operability is high. Furthermore, even when the wear of the clutch disks 42 and 43 progresses, the posture of the diaphragm spring assembly 18 can be maintained even when the friction facings are worn by using the cushion members 37 having different heights of the fulcrum portions 37b. That is, the set load can be maintained for a long time. As described above, the adjustment at the time of wear in the clutch 1 can be performed only by replacing a member smaller than the pressure plate 17.

Since the cushion member 37 is a leaf spring,
High dimensional accuracy can be maintained. Further, since the cushion member 37 is a flat leaf spring, setting of characteristics is easier. Further, since a gap is secured on the outer peripheral side between the cushion member 37 and the pressure plate 17,
Abrasion powder and the like of the clutch disks 42 and 43 are unlikely to enter between the pressure plate 17 and the cushion member 37, and even if they enter, they can be easily discharged by centrifugal force.

The cushion member can be employed in a multi-plate clutch having more frictional engagement surfaces than in the present embodiment. The cushion member can also be employed in a clutch cover assembly having one diaphragm spring, a push type clutch, a gear drive type clutch having a plurality of teeth, and the like. [Effect of Pin 38] Since the pin 38 prevents the cushion member 37 and the diaphragm spring assembly 18 from rotating with respect to the pressure plate 17,
Wear at each fulcrum is prevented. Also, the number of parts is reduced.

Since it is easy to assemble the cushion member 37 and the diaphragm spring assembly 18 to the pin 38, the assembling workability is improved. The member for realizing the detent is not limited to the pin, but may be another component such as a bolt. The pin as the detent member can be employed in a multi-plate clutch having more frictional engagement surfaces than in the present embodiment. In addition, the detent member is 1
The present invention is also applicable to a clutch cover assembly having two diaphragm springs, a push type clutch, a gear drive type clutch having a plurality of teeth, and the like. [Effects of Boss 9] A. The boss 9 includes the flywheel 2 and the clutch cover 16
Since the point boss 9 separate from the flywheel 2 and the clutch cover 16 is a single member separated from the flywheel 2 and the clutch cover 16, the following effects are produced.
Although the clutch 1 shown in FIG. 1 is a twin clutch, when this clutch is changed to, for example, a triple type using three clutch disk assemblies, it is only necessary to replace the boss 9. Here, the boss 9 functions as a member capable of changing the axial dimension of the clutch 1. That is, there is no need to replace large components such as the flywheel 2 and the clutch cover assembly 3 and the assembly, as in the related art. As a result, when the user changes the specifications of the clutch 1, the handling is facilitated. Also, when the column portion 11 of the boss 9 is worn and the engagement portion is replaced, only the boss 9 needs to be replaced.

B. Annular part 10 and pillar part with boss 9 integrated
Since the point boss 9 composed of 11 is composed of the integral annular portion 10 and the column portion 11, the dimensional accuracy of the parts is improved. For example,
The flatness of the annular surface of the annular portion 10 that contacts the flywheel 2 is improved. Further, the axial position of the axial end surface of each pillar portion 11 which abuts on the outer peripheral portion 23 of the clutch cover 16 is accurately maintained.

The boss may have a configuration in which the annular portion is detachably fixed to the clutch cover, and the plurality of pillar portions are detachably fixed to the flywheel. Further, the boss may have a configuration in which annular portions are integrally formed on both axial sides of the pillar portion. The structure of the boss can also be employed in a multi-plate clutch having more frictional engagement surfaces than in the present embodiment. Also, the boss
The present invention is also applicable to a clutch cover assembly having one diaphragm spring and a push type clutch. [Effect of Spring 50] By providing the spring 50 (elastic member) on the intermediate plate 44 (annular member), the axial positioning of the intermediate plate 44 with respect to the flywheel 2 and the pressure plate 17 is reliably performed at the time of disengaging the clutch. More specifically, the intermediate plate 44 is located axially intermediate between the flywheel 2 and the pressure plate 17.

When the spring constants of the springs 50 on both sides in the axial direction are the same, the movement amount of the intermediate plate 44 in the axial direction changes just half of the movement amount of the pressure plate 17. When the spring constant of the spring 50 on the pressure plate 17 side is larger than the spring constant of the spring 50 on the flywheel 2 side, the moving amount of the intermediate plate 44 changes to less than half of the moving amount of the pressure plate 17. By setting the spring constants of the two types of springs 50 in this way, the rate of movement of the intermediate plate 44 with respect to the pressure plate 17 can be adjusted.

In particular, in this embodiment, since the spring 50 is fixed to the intermediate plate 44 to form one frictional engagement member, the operability in carrying and assembling is improved. The portion of the leaf spring 50 that comes into contact with other members is smoothly curved by the bent portion 54, and therefore is not easily damaged. The configuration of the friction engagement member by the spring 50 is applicable to an intermediate plate of the twin clutch (this embodiment), a pressure plate, a pressure plate of a single-plate clutch, a drive plate of a multi-plate clutch having more friction engagement surfaces than in this embodiment, and the like. Can be adopted. The spring fixed to the pressure plate of the twin clutch abuts the intermediate plate and the clutch cover to determine the axial position of the pressure plate. The spring fixed to the pressure plate of the single-plate clutch contacts the flywheel and the clutch cover to determine the axial position of the pressure plate. In a multi-plate clutch having a plurality of drive plates, a spring is fixed to the plurality of drive plates and abuts on an adjacent drive plate in the axial direction to determine the axial position of each drive plate.

The spring 50 may use other springs such as a coil spring other than the leaf spring. The configuration of the spring fixed to the intermediate plate can also be employed in a push-type clutch or a gear-drive type clutch having a plurality of teeth. This configuration can also be employed in a clutch cover assembly having a single diaphragm spring. [Effects of Diaphragm Spring Assembly 18] In the diaphragm spring assembly 18, the torque transmission capacity of the clutch 1 is increased by using two diaphragm springs 29 and 30 in an overlapping manner. Here, the second
By increasing the inner diameter of the diaphragm spring 30, the portion (35) of the lever portion that engages with the release device 19 is constituted by one diaphragm spring.
The release device 19 can be mounted in the same manner as in the related art. That is, it is not necessary to use a release device having a special structure even in a double-layered diaphragm spring assembly, and common components can be used.

The structure composed of two diaphragm springs can be used for a single-plate clutch or a multi-plate clutch having more frictional engagement surfaces than in the present embodiment. In addition, a configuration including two diaphragm springs can be employed in a push-type clutch and a gear-drive-type clutch including a plurality of teeth. [Effects of the circlip 21] The circlip 21 connects the diaphragm spring assembly 18 to the clutch cover 16.
Engaged irreversibly. That is, the circlip 21 allows the clutch cover 16 and the wiring 20
And the first and second diaphragm springs 29, 30 constitute one sub-assembly. This sub-assembly can be used as one member when transporting and assembling the entire clutch 1.

Particularly, in this embodiment, since the pressure plate 17 is not fixed to the clutch cover by a strap plate or the like, it is important that the above-mentioned members constitute one sub-assembly during transportation and assembly. In particular, in the pull type clutch shown in the figure, the diaphragm spring becomes more important because it is not undetachably supported by the clutch cover.

It is preferable that the circlip 21 as a locking member can be detached from the clutch cover 16 as necessary. If the locking member can be removed, use wiring 2
It is easy to replace the zero or the diaphragm spring assembly 18. The locking member is not limited to a circlip.
That is, it is possible to use another member. The circlip serving as the locking member can be used for a single-plate clutch or a multi-plate clutch having more frictional engagement surfaces than in the present embodiment. The locking member can also be employed in a clutch cover assembly having one diaphragm spring. However, the circlip as a locking member is the most common in a clutch cover assembly in which the pressure plate is not fixed to the clutch cover as in a boss drive type multi-plate clutch and a diaphragm spring for a pull type is arranged. It is effective.

[0048]

In the clutch cover assembly according to the present invention, since the cushion member and the diaphragm spring are prevented from rotating with respect to the pressure plate by the rotation preventing member, the cushion member rotates relative to the pressure plate and the diaphragm spring. Without
Wear between the members is less likely to occur. In particular, since the two members, the diaphragm spring and the cushion member, are prevented from rotating together by the rotation preventing member on the pressure plate, the number of parts is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a clutch according to the present invention.

FIG. 2 is a plan view of a clutch.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 1;

FIG. 4 is a partial cross-sectional view illustrating a configuration of a cushion member arranged on a pressure plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clutch 2 Flywheel 3 Clutch cover assembly 4 Clutch disk assembly 7 Friction surface 9 Boss 10 Annular part 11 Column part 16 Clutch cover 17 Pressure plate 18 Diaphragm spring assembly 19 Release device 20 Wiring 29 First diaphragm spring 30 Second Diaphragm spring 42, 43 Clutch disc 44 Intermediate plate 45 Annular body 50 Spring

Claims (5)

[Claims] 1. A clutch cover assembly for connecting a clutch between an input rotary body and an output rotary body by pressing a friction member, wherein the clutch cover assembly rotates integrally with the input rotary body. A clutch cover axially opposed to the friction member; a pressure plate disposed on the friction member side of the clutch cover and having a first surface on the friction member side and a second surface on the clutch cover side; A cushion member disposed on the second surface of the pressure plate; a diaphragm spring supported by the clutch cover for urging the pressure plate toward the friction member via the cushion member; The cushion member and the diaphragm spring are provided on the second surface Clutch cover assembly comprising a detent member which detent relative to the plate, the 2. The device according to claim 1, wherein the detent member extends axially from the second surface of the pressure plate, and is rotationally engaged with the cushion member and the diaphragm spring. Clutch cover assembly. 3. The clutch cover assembly according to claim 2, wherein said detent member is a pin having one end inserted into a hole formed in said second surface of said pressure plate. 4. A part of the cushion member is supported by a second surface of the pressure plate, and another part is arranged with a gap in the axial direction with respect to the second surface, and the diaphragm is The clutch cover assembly according to any one of claims 1 to 3, wherein the biasing force is applied by a spring. 5. The clutch cover assembly according to claim 4, wherein said cushion member is a disk-shaped member.