JPH11132251A - Diaphragm spring and clutch cover assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve following performance of a clutch device in relation to the movement of a release member by improving rigidity of a lever part of a diaphragm spring. SOLUTION: A diaphragm spring 4 is provided with a supporting part 12, a pressing part 11, and a plurality of lever parts 13. The supporting part 12 is supported on a clutch cover. The pressing part 11 is a part to be formed on the outer peripheral side of the supporting part 12 and presses a pressure plate to a member to be driven. The lever parts 13 extend from the supporting part 12 to the inner peripheral side, and the inner peripheral side tip parts 13e are brought into contact with a release member. A rib 13c is formed on each lever part 13. Each rib 13c extends to the inner peripheral side tip of the lever part 13 in the radial direction. The release member is brought into contact with a part raised by the formation of the rib 13c in the lever part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm spring of a clutch cover assembly which is mounted on a driving member together with a clutch cover and presses a driven member against a driving member via a pressure plate in conjunction with a release member. And a clutch cover assembly.

[0002]

2. Description of the Related Art Generally, a clutch device is provided with a clutch cover assembly for pressing a clutch disk against a flywheel and releasing the pressing. The clutch cover assembly includes a pressure plate for holding the clutch disc between the flywheel and the clutch disc,
It has a diaphragm spring or a coil spring for urging the pressure plate against the clutch disk, and these are housed in a clutch cover fixed to the flywheel.

For example, in a push-type clutch cover assembly, a pressing portion formed on an outer peripheral side of the supporting portion of the diaphragm spring presses a pressure plate with a supporting portion supported by the clutch cover as a fulcrum.
A release member abuts on a tip (inner periphery) of the lever portion extending from the support to the inner periphery. By moving the release member to the engine side, the pressing portion is pulled up to the transmission side with the support portion as a fulcrum, and the pressing on the pressure plate is released.

In the pull-type clutch cover assembly, the diaphragm spring presses the pressure plate with a pressing portion formed on the inner peripheral side of the supporting portion with the supporting portion supported by the clutch cover as a fulcrum. Also,
A release member abuts on a distal end (inner periphery) of the lever portion extending from the pressing portion to the inner periphery. By moving the release member toward the transmission, the pressing portion is pulled up toward the transmission, and the pressing on the pressure plate is released.

[0005]

In the operation of the clutch device, it is desirable that the on / off operation of the clutch follow the movement of the release member faithfully. However, in the clutch device using the clutch cover assembly as described above, the elastic deformation of the diaphragm spring is a major factor in the reduction in followability to the movement of the release member together with the elastic deformation of the clutch cover. In other words, when the pressure plate is moved via the diaphragm spring by the movement of the release member,
Since the diaphragm spring and the clutch cover are elastically deformed, a time loss occurs between the movement of the release member and the movement of the pressure plate.

In order to improve the followability of the clutch device to the movement of the release member, in addition to measures such as increasing the plate thickness of the diaphragm spring and the clutch cover,
In order to avoid an increase in weight due to an increase in plate thickness, for example, measures have been taken to increase rigidity by providing ribs on the diaphragm spring. One example of the rib 92a of the diaphragm spring 91 is shown in FIGS. Rib 92a
Extends radially in a central portion of a lever portion 92 of the diaphragm spring 91, and a release bearing (release member) 99 is in contact with an inner peripheral end portion of the lever portion 92. However, the rib 92a is not formed over the entire radial direction of the lever portion 92.
Is required, so that it is left flat without any processing such as rib formation.

However, there is a demand for a higher followability of the clutch device with respect to the movement of the release member, and it is also desirable to reduce the clutch pedal depression force without lowering the conventional followability. An object of the present invention is to improve the stiffness of a lever portion of a diaphragm spring to improve the followability of a clutch device with respect to the movement of a release member, or to reduce the followability of the clutch device with respect to the movement of a release member. In order to reduce the release load of the clutch device by lengthening the portion.

[0008]

The diaphragm spring according to the first aspect is mounted on a driving member together with the clutch cover, and presses the driven member against the driving member via a pressure plate in conjunction with the release member. A diaphragm spring for a clutch cover assembly,
It has a support portion, a pressing portion, and a plurality of lever portions.
The support is supported by the clutch cover. The pressing portion is a portion formed on the outer peripheral side of the support portion, and presses the pressure plate against the driven member. The lever portion extends from the support portion to the inner peripheral side, and an inner peripheral end portion abuts on the release member. A rib is formed on this lever portion. The rib extends in the radial direction and continues to the inner peripheral end of the lever portion. The release member abuts on a portion of the lever portion that is raised by the formation of the rib.

In the conventional diaphragm spring, a rib is formed so as to raise a central portion of the lever portion, but the rib is not formed over the entire radial direction of the lever portion. In particular, the end portion of the lever portion needs a flat portion to make contact with the release member, and thus is left flat without processing such as rib formation. In the invention described in this claim, the rib is formed so as to continue to the inner peripheral end of the lever portion, and the release member is brought into contact with a portion of the lever portion which is raised due to the formation of the rib. By forming the rib up to the inner peripheral end of the lever portion in this manner, the bending rigidity of the lever portion can be set to be larger than that of a conventional diaphragm spring having the same other structure. Therefore, the amount of elastic deformation of the lever portion per unit load is reduced, so that the time loss of the movement of the pressing portion of the diaphragm spring with respect to the movement of the release member is reduced, and the followability of the clutch device to the movement of the release member is improved. Also, even if the lever portion of the diaphragm spring is lengthened, the same bending rigidity can be secured, so that the lever ratio can be increased without reducing the followability of the clutch device to the movement of the release member. The release load of the clutch device can be reduced, and the clutch pedal depression force can be reduced.

[0010] The rib formed on the lever portion may be a rib having a flat top or a rib having a cross-sectionally arched shape. However, even when a rib having a cross section of an arch shape is formed, it is desirable that the surface in contact with the release member is a flat surface. The diaphragm spring according to claim 2 is a diaphragm spring of a clutch cover assembly which is mounted on a driving member together with a clutch cover and presses a driven member against a driving member via a pressure plate in conjunction with a release member. And a supporting portion, a pressing portion, and a plurality of lever portions. The support is supported by the clutch cover. The pressing portion is a portion formed on the outer peripheral side of the support portion, and presses the pressure plate against the driven member. Each of the plurality of lever portions includes an inner peripheral lever portion and an outer peripheral lever portion, and extends from the support portion to the inner peripheral side. An inner peripheral end of the inner peripheral lever portion of the lever portion contacts the release member. The outer peripheral lever portion of the lever portion connects the outer peripheral end of the inner peripheral lever portion of the lever portion to the support portion, and the circumferential width is larger than the circumferential width of the outer peripheral end of the inner peripheral lever portion of the lever portion. Is also narrow. Both ends in the circumferential direction of the inner peripheral lever portion of the lever portion are bent.

Generally, the lever portion of the diaphragm spring has an outer peripheral lever portion having a narrow width in the circumferential direction in order to avoid interference with a support mechanism for supporting the diaphragm spring on the clutch cover, and an inner peripheral side from the outer peripheral lever portion. And an inner peripheral lever portion extending to the right. In the case of such a structure, the inner circumferential lever portion is set to have a wide width in the circumferential direction as long as it does not interfere with other adjacent inner circumferential lever portions. The width in the direction becomes larger than the circumferential width of the outer peripheral lever portion.

In the conventional diaphragm spring having such a structure, a portion for increasing the rigidity of a portion of the outer peripheral portion of the inner peripheral lever portion that is wider than the circumferential width of the outer peripheral lever portion is devised. Has not been specifically made. In the invention described in this claim, the inner peripheral lever portion is processed so as to bend both ends in the circumferential direction. For this reason, the bending rigidity of the lever portion can be set to be larger than that of a conventional diaphragm spring having the same other structure. Therefore, the amount of elastic deformation of the lever portion per unit load is reduced, so that the time loss of the movement of the pressing portion of the diaphragm spring with respect to the movement of the release member is reduced, and the followability of the clutch device to the movement of the release member is improved. Also, even if the lever portion of the diaphragm spring is lengthened, the same bending rigidity can be secured, so that the lever ratio can be increased without reducing the followability of the clutch device to the movement of the release member. The release load of the clutch device can be reduced, and the clutch pedal depression force can be reduced.

[0013] The diaphragm spring according to claim 3 is mounted on a drive side member together with the clutch cover,
A diaphragm spring of a clutch cover assembly for pressing a driven member against a driving member via a pressure plate in conjunction with a release member, the diaphragm spring including a support portion, a pressing portion, and a plurality of lever portions. The support is supported by the clutch cover. The pressing portion is a portion formed on the outer peripheral side of the support portion, and presses the pressure plate against the driven member. Each of the plurality of lever portions has an inner peripheral lever portion and an outer peripheral lever portion, and extends from the support portion to the inner peripheral side. An inner peripheral end of the inner peripheral lever portion of the lever portion contacts the release member. The outer peripheral lever portion of the lever portion connects the outer peripheral end of the inner peripheral lever portion of the lever portion to the support portion, and the circumferential width is larger than the circumferential width of the outer peripheral end of the inner peripheral lever portion of the lever portion. Is also narrow. Both ends in the circumferential direction of the inner peripheral lever portion of the lever portion are bent. Also,
A rib extending in the radial direction and extending to the inner peripheral end of the lever portion is formed on the lever portion. The release member comes into contact with a portion of the lever portion that is raised by the formation of the rib.

The diaphragm spring according to claim 4 is mounted on a drive side member together with the clutch cover,
A diaphragm spring of a clutch cover assembly for pressing a driven member against a driving member via a pressure plate in conjunction with a release member, the diaphragm spring including a support portion, a pressing portion, and a plurality of lever portions. The support is supported by the clutch cover. The pressing portion is a portion formed on the inner peripheral side of the support portion, and presses the pressure plate against the driven member. The lever portion extends from the pressing portion to the inner peripheral side, and a distal end portion on the inner peripheral side contacts the release member. A rib is formed on this lever portion. The rib extends in the radial direction and continues to the inner peripheral end of the lever portion. The release member abuts on a portion of the lever portion that is raised by the formation of the rib.

In the conventional diaphragm spring, a rib is formed so as to raise a central portion of the lever portion, but the rib is not formed over the entire radial direction of the lever portion. In particular, the end portion of the lever portion needs a flat portion to make contact with the release member, and thus is left flat without processing such as rib formation. In the invention described in this claim, the rib is formed so as to continue to the inner peripheral end of the lever portion, and the release member is brought into contact with a portion of the lever portion which is raised by the rib. By forming the rib up to the inner peripheral end of the lever portion in this manner, the bending rigidity of the lever portion can be set to be larger than that of a conventional diaphragm spring having the same other structure. Therefore, the amount of elastic deformation of the lever portion per unit load is reduced, so that the time loss of the movement of the pressing portion of the diaphragm spring with respect to the movement of the release member is reduced, and the followability of the clutch device to the movement of the release member is improved. Also, even if the lever portion of the diaphragm spring is lengthened, the same bending rigidity can be secured, so that the lever ratio can be increased without reducing the followability of the clutch device to the movement of the release member. The release load of the clutch device can be reduced, and the clutch pedal depression force can be reduced.

The rib formed on the lever portion may be a rib having a flat top, or a rib having an arched cross section. However, even when a rib having a cross section of an arch shape is formed, it is desirable that the surface in contact with the release member is a flat surface. The diaphragm spring according to claim 5 is a diaphragm spring of a clutch cover assembly mounted on a driving member together with a clutch cover and pressing a driven member against a driving member via a pressure plate in conjunction with a release member. And a supporting portion, a pressing portion, and a plurality of lever portions. The support is supported by the clutch cover. The pressing portion is a portion formed on the inner peripheral side of the support portion, and presses the pressure plate against the driven member. Each of the plurality of lever portions includes an inner peripheral lever portion and an outer peripheral lever portion, and extends from the pressing portion to the inner peripheral side. An inner peripheral end of the inner peripheral lever portion of the lever portion contacts the release member. The outer peripheral lever portion of the lever portion connects the outer peripheral end of the inner peripheral lever portion of the lever portion to the support portion, and the circumferential width is larger than the circumferential width of the outer peripheral end of the inner peripheral lever portion of the lever portion. Is also narrow. Both ends in the circumferential direction of the inner peripheral lever portion of the lever portion are bent.

Generally, the lever portion of the diaphragm spring has an outer peripheral lever portion having a narrow width in the circumferential direction to avoid interference with a member penetrating the diaphragm spring, and an inner peripheral portion extending inward from the outer peripheral lever portion. Often comprised of a lever. In the case of such a structure, the inner circumferential lever portion is set to have a wide width in the circumferential direction as long as it does not interfere with other adjacent inner circumferential lever portions. The width in the direction becomes larger than the circumferential width of the outer peripheral lever portion.

In the conventional diaphragm spring having such a structure, the portion of the outer peripheral portion of the inner peripheral lever portion, which is wider than the circumferential width of the outer peripheral lever portion, is designed to improve rigidity. Has not been specifically made. In the invention described in this claim, the inner peripheral lever portion is processed so as to bend both ends in the circumferential direction. For this reason, the bending rigidity of the lever portion can be set to be larger than that of a conventional diaphragm spring having the same other structure. Therefore, the amount of elastic deformation of the lever portion per unit load is reduced, so that the time loss of the movement of the pressing portion of the diaphragm spring with respect to the movement of the release member is reduced, and the followability of the clutch device to the movement of the release member is improved. Also, even if the lever portion of the diaphragm spring is lengthened, the same bending rigidity can be secured, so that the lever ratio can be increased without reducing the followability of the clutch device to the movement of the release member. The release load of the clutch device can be reduced, and the clutch pedal depression force can be reduced.

The diaphragm spring according to claim 6 is mounted on a drive side member together with a clutch cover,
A diaphragm spring of a clutch cover assembly for pressing a driven member against a driving member via a pressure plate in conjunction with a release member, the diaphragm spring including a support portion, a pressing portion, and a plurality of lever portions. The support is supported by the clutch cover. The pressing portion is a portion formed on the inner peripheral side of the support portion, and presses the pressure plate against the driven member. Each of the plurality of lever portions has an inner peripheral lever portion and an outer peripheral lever portion, and extends from the pressing portion to the inner peripheral side. An inner peripheral end of the inner peripheral lever portion of the lever portion contacts the release member. The outer peripheral lever portion of the lever portion connects the outer peripheral end of the inner peripheral lever portion of the lever portion to the support portion, and the circumferential width is larger than the circumferential width of the outer peripheral end of the inner peripheral lever portion of the lever portion. Is also narrow. Both ends in the circumferential direction of the inner peripheral lever portion of the lever portion are bent. Also,
A rib extending in the radial direction and extending to the inner peripheral end of the lever portion is formed on the lever portion. The release member comes into contact with a portion of the lever portion that is raised by the formation of the rib.

According to a seventh aspect of the present invention, there is provided a clutch cover assembly for pressing or releasing a driven member against a driving member, the clutch cover assembly comprising a clutch cover, a pressure plate, a diaphragm spring. It has. The clutch cover is fixed to the driving member. The pressure plate is disposed on the inner peripheral side of the clutch cover, and cannot rotate relative to the clutch cover and can move in the axis OO. The diaphragm spring is according to any one of claims 1 to 6, and is supported by the clutch cover.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Clutch cover assembly 1 shown in FIG.
Is a main configuration of a clutch device for connecting a clutch by pressing a friction member 51 of a clutch disk assembly (driven member) against a flywheel (drive member) 50 or releasing the pressing to disconnect the clutch. One of the assemblies. The clutch cover assembly 1 shown in FIG.
It is for a push type clutch device, and mainly includes a clutch cover 2, a pressure plate 3,
And a diaphragm spring 4.

The clutch cover 2 is a generally plate-shaped plate member, and its outer peripheral portion is fixed to the flywheel 50 by, for example, bolts. In the center of the clutch cover 2,
A large diameter hole is formed. A plurality of tags 2a are provided in the inner peripheral portion of the clutch cover 2 in the circumferential direction, and the tags 2a are bent toward the flywheel 50 (the left side in FIG. 1, hereinafter referred to as the engine side). The tip 2b of the tag 2a is bent radially outward after incorporating the wiring 20, the diaphragm spring 4 and the wiring 21. Thus, the tag 2a
Support the diaphragm spring 4.

The pressure plate 3 is an annular member having a pressing surface 3a formed on the side facing the flywheel 50. A friction member 51 of the clutch disc assembly is disposed between the pressing surface 3a and the flywheel 50. Further, the pressure plate 3 has a protruding portion 3b that protrudes in the direction of the axis OO on a side opposite to the pressing surface 3a. The pressure plate 3 has a plurality of connecting protrusions 3 c protruding to the outer peripheral side, and one end of the strap plate 6 is attached to the connecting protrusion 3 c by a rivet 7.
Has been fixed by. The strap plate 6 extends tangentially to the pressure plate 3, and the other end is fixed to the clutch cover 2. That is, the pressure plate 3 is attached to the clutch cover 2 so as to be relatively non-rotatable and movable in the axis OO. The pressure plate 3 is urged away from the flywheel 50 by the urging force of the strap plate 6.

The diaphragm spring 4 is a disk-shaped member disposed between the pressure plate 3 and the clutch cover 2 and is supported by the clutch cover 2. The diaphragm spring 4 includes a pressing portion 11 and
It comprises a support portion 12 on the inner peripheral side of the pressing portion 11 and a plurality of lever portions 13 extending radially inward from the support portion 12. Further, the diaphragm spring 4 is connected to the lever 1
A slit is formed between the slits 3, and a substantially trapezoidal hole 4a is formed in the outer peripheral portion of each slit.

The outer peripheral portion of the pressing portion 11 is in contact with the projecting portion 3b of the pressure plate 3 (see FIG. 1). The support portion 12 is supported by the tag 2a of the clutch cover 2 via the wirings 20 and 21. Lever part 13
Is composed of an outer peripheral lever portion 13a on the outer peripheral side and an inner peripheral lever portion 13b on the inner peripheral side, and a rib 13c is formed at the center in the circumferential direction over the outer peripheral lever portion 13a and the inner peripheral lever portion 13b. .

The outer peripheral lever portion 13a is a portion of the lever portion 13 sandwiched between adjacent holes 4a,
Adjacent to 2. The inner peripheral lever 13b is a lever 1
3 is a portion extending from the outer peripheral lever portion 13a to the inner peripheral side, and becomes narrower toward the distal end. The distal end portion (inner peripheral end portion) of the inner peripheral lever portion 13b is a distal end portion 13e.
The release member 52 is in contact with the tip portion 13e.

The rib 13c is formed at a substantially central portion in the circumferential direction of the outer peripheral lever portion 13a and the inner peripheral lever portion 13b, and extends in the radial direction. The circumferential width of the rib 13c is slightly smaller than the circumferential width of the outer peripheral lever portion 13a. As shown in FIGS. 3 and 4, the distal end portion 13 e is connected to the outer circumferential lever portion 13 a where the rib 13 is not formed and the inner circumferential lever portion 13 b where the rib 13 is not formed among the ribs 13 c and the axis O-O. The positions in the directions are on the different raised portions 13d.

As described above, the raised portion 13d of the rib 13c continues to the inner peripheral end of the lever 13 here. The wiring 20, the inner periphery of the pressing portion 11 of the diaphragm spring 4, and the wiring 21 are sandwiched between the tip 2b of the tag 2a and the inner periphery of the clutch cover 2. Thus, the diaphragm spring 4 is supported by the clutch cover 2.

Next, the operation of the clutch cover assembly 1 will be described. In the clutch cover assembly 1, when the clutch is engaged, the pressure plate 3 presses the friction member 51 of the clutch disk assembly between the pressure plate 3 and the flywheel 50 by the diaphragm spring 4.
As a result, the flywheel 50 and the friction member 51 come into pressure contact with each other, and the torque from the flywheel 50 is transmitted to the clutch disk assembly. To release the pressing at the time of release, the release member 52 moves the tip of the lever portion 13 of the diaphragm spring 4 toward the engine, and the outer peripheral portion of the pressing portion 11 of the diaphragm spring 4 is reversed with respect to the engine with the wiring 21 as a fulcrum. Side (the right side in FIG. 1; hereinafter, referred to as the transmission side). Then, the pressure plate 3 also moves to the transmission side by the urging force of the strap plate 6. Thereby, the flywheel 50
And the friction member 51 of the clutch disk assembly sandwiched between the flywheel 50 and the pressure plate 3 is separated from the flywheel 50 and the pressure plate 3, and the transmission of torque is cut off.

In the conventional diaphragm spring, a rib is formed so as to swell the central portion of the lever portion, but the rib is not formed over the entire radial direction of the lever portion. In particular, the end portion of the lever portion needs a flat portion to make contact with the release member, and thus is left flat without processing such as rib formation. In the diaphragm spring 4 of the present embodiment, the rib 13c
Is formed so as to continue to the inner peripheral end of the lever portion 13, and the release member 52 is brought into contact with the end portion 13e on the raised portion 13d which is raised by the formation of the rib 13c. As a result, the bending rigidity of the lever portion 13 is greater than that of a conventional diaphragm spring having the same other structure.

Therefore, the amount of bending deformation of the lever portion 13 per unit load is reduced, the time loss of the movement of the pressing portion 11 of the diaphragm spring 4 with respect to the movement of the release member 52 is reduced, and the movement of the clutch device with respect to the movement of the release member 52 is reduced. Followability is improved. Further, even if the lever portion 13 of the diaphragm spring 4 is lengthened, the same bending rigidity can be secured, so that the release member 5
The lever ratio can be increased without lowering the followability of the clutch device to the second movement, the release load of the clutch device can be reduced, and the clutch pedal depression force can be reduced.

Here, a rib 13c having a flat top is formed on the lever portion 13 (see FIG. 5), but a rib having a cross section of an arch shape may be formed instead of the rib 13c. However, even when a rib having a cross section of an arch shape is formed, it is desirable that the surface that the release member 52 contacts is a flat surface. [Second Embodiment] In this embodiment, a diaphragm spring 4 shown in FIGS. 6 to 8 is employed instead of the diaphragm spring 4 shown in FIGS. 3 to 5 of the first embodiment. In the following description, the same or similar members as those in the first embodiment are denoted by the same reference numerals.

The diaphragm spring 4 of the present embodiment
Is a pressing portion 11 and a supporting portion 12 on the inner peripheral side of the pressing portion 11.
And a plurality of lever portions 13 extending radially inward from the support portion 12. In the diaphragm spring 4, slits are formed between the lever portions 13, and substantially trapezoidal holes 4a are formed in the outer peripheral portions of these slits.

The lever portion 13 is provided on the outer peripheral lever portion 1 on the outer peripheral side.
3a and an inner peripheral lever portion 13b on the inner peripheral side, and has a shape in which both ends in the circumferential direction are bent. The outer peripheral lever portion 13 a is a portion of the lever portion 13 sandwiched between the adjacent holes 4 a and is adjacent to the support portion 12.
The inner peripheral lever portion 13b is a portion of the lever portion 13 that extends inward from the outer peripheral lever portion 13a, and has a width that decreases toward the distal end. A release member 52 abuts on a tip portion (inner peripheral end portion) of the inner peripheral lever portion 13b.
The circumferential width of the outer circumferential portion of the inner circumferential lever portion 13b is larger than the circumferential width of the outer circumferential lever portion 13a. Both ends in the circumferential direction of the outer peripheral portion of the inner peripheral lever portion 13b are bent as shown in FIG. 7 and FIG.
One bent portion 13f is formed.

The other configuration is the same as that of the first embodiment. In the conventional diaphragm spring, no special measures are taken to improve the rigidity of the outer circumferential portion of the inner circumferential lever portion that is wider than the circumferential width of the outer circumferential lever portion. In the diaphragm spring 4 of the present embodiment, a process is performed in which both ends in the circumferential direction of the inner peripheral lever portion 13b are bent to form a bent portion 13f. Therefore, the bending rigidity of the inner peripheral lever portion 13b is larger than that of a conventional diaphragm spring having the same other structure. Therefore, the amount of bending deformation per unit load of the lever portion 13 is reduced,
The time loss of the movement of the pressing portion 11 of the diaphragm spring 4 with respect to the movement of the release member 52 is reduced, and the ability of the clutch device to follow the movement of the release member 52 is improved.

[Third Embodiment] In the present embodiment,
The diaphragm spring 4 in which the bent portion 13f used in the diaphragm spring 4 of the second embodiment shown in FIGS. 6 to 8 is further formed on the diaphragm spring 4 shown in FIGS. 3 to 5 of the first embodiment is adopted. I do. FIG. 9 shows the diaphragm spring 4 of the present embodiment.
To FIG.

As shown in FIGS. 9 to 11, the lever portion 13 of the diaphragm spring 4 of this embodiment has a bent portion 13f in addition to the rib 13c. As a result, the lever portion 13 of the first or second embodiment can be used.
The bending rigidity of the lever portion 13 is greater than that of the lever portion 13. [Fourth Embodiment] The diaphragm spring described in the first to third embodiments is used for the clutch cover assembly 1 for a push-type clutch device. The present invention of forming 13f can also be applied to a clutch cover assembly for a pull-type clutch device. In the following description, the same or similar members as those in the first embodiment are denoted by the same reference numerals.

The clutch cover assembly 31 shown in FIG.
Is for a pull-type clutch device, and mainly includes a clutch cover 2, a pressure plate 3,
And a diaphragm spring 8. The clutch cover 2 is a generally dish-shaped plate member, and the outer peripheral portion is fixed to the flywheel 50 by, for example, bolts.

The pressure plate 3 is an annular member having a pressing surface 3a formed on the side facing the flywheel 50. The pressure plate 3 is formed with a protruding portion 3b protruding in the direction of the axis OO on the side opposite to the pressing surface 3a. The diaphragm spring 8 is a disk-shaped member disposed between the pressure plate 3 and the clutch cover 2.
Supported through. This diaphragm spring 8
Are a supporting portion 81 and a pressing portion 82 on the inner peripheral side of the supporting portion 81.
And a plurality of lever portions 13 extending radially inward from the pressing portion 82. In the diaphragm spring 8, slits are formed between the lever portions 13, and substantially trapezoidal holes 4a are formed in the outer peripheral portions of these slits.

The support portion 81 is supported by the clutch cover 2 via the wiring 40 (see FIG. 12), and its movement toward the transmission is restricted. Pressing part 82
The surface on the engine side is in contact with the protrusion 3 b of the pressure plate 3, and the surface on the transmission side is in contact with the tip of the clip 41. The clip 41 is fixed to the pressure plate 3 by a bolt 42, and regulates the relative movement of the pressing portion 82 of the diaphragm spring 8 and the pressure plate 3 along the axis OO.

The structure of the lever 13 is the same as that of the first embodiment. However, in the first embodiment, the release member 52 is attached to the tip portion 13e from the transmission side.
In the present embodiment, the release member 53 is in contact with the distal end portion 13e from the engine side. Other configurations are the same as in the first embodiment.

Next, the operation of the clutch cover assembly 31 will be described. When the clutch cover assembly 31 is in the clutch connected state, the pressure plate 3 presses the friction member 51 of the clutch disc assembly between the pressure plate 3 and the flywheel 50 by the diaphragm spring 8.
As a result, the flywheel 50 and the friction member 51 come into pressure contact with each other, and the torque from the flywheel 50 is transmitted to the clutch disk assembly. To release this pressing at the time of release, the release member 53 moves the tip of the lever portion 13 of the diaphragm spring 8 toward the transmission, and moves the pressing portion 82 of the diaphragm spring 8 toward the transmission with the wiring 40 as a fulcrum. Then, the pressure plate 3 is pulled by the clip 41 and also moves to the transmission side. Thus, the friction member 51 of the clutch disk assembly held between the flywheel 50
Comes and comes in contact with the flywheel 50 and the pressure plate 3, and the transmission of torque is cut off.

The effect of forming the rib 13c on the diaphragm spring 8 according to the present embodiment is the same as that of the first embodiment. [Fifth Embodiment] FIGS. 12 and 13 of the fourth embodiment.
Instead of the lever portion 13 of the diaphragm spring 8 shown in FIG. 6, a structure of the lever portion 13 as shown in FIGS. 6 to 8 can be adopted. The structure of the lever 13 is the same as that of the second embodiment.

Also in this embodiment, the inner peripheral lever 13
B is bent at both ends in the circumferential direction to form a bent portion 1
Since the processing for forming 3f is performed, the bending rigidity of the inner peripheral lever portion 13b is larger than that of a conventional diaphragm spring having the same other structure. Therefore, the amount of bending deformation per unit load of the lever portion 13 is reduced, the time loss of the movement of the pressing portion 11 of the diaphragm spring 4 with respect to the movement of the release member 53 is reduced, and the followability of the clutch device with respect to the movement of the release member 53 is reduced. improves.

[Sixth Embodiment] FIG. 1 of the fourth embodiment.
Instead of the lever portion 13 of the diaphragm spring 8 shown in FIGS. 2 and 13, a structure of the lever portion 13 as shown in FIGS. 9 to 11 can be adopted. This lever part 1
The structure of No. 3 is the same as that of the third embodiment.

The lever 13 of this embodiment includes a rib 13
A bent portion 13f is formed in addition to c. Thereby, the bending rigidity of the lever portion 13 is larger than that of the lever portion 13 of the fourth or fifth embodiment.

[0047]

According to the present invention, the lever of the lever portion is formed so as to extend to the tip on the inner peripheral side, or by bending both ends of the inner peripheral lever portion of the lever portion in the circumferential direction. Since the rigidity of the part is increased, the followability of the clutch device to the movement of the release member is improved, or the release load of the clutch device is increased by lengthening the lever part without decreasing the followability of the clutch device to the movement of the release member Can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a clutch device including a clutch cover assembly according to a first embodiment of the present invention.

FIG. 2 is a plan view of the diaphragm spring according to the first embodiment.

FIG. 3 is a partially enlarged view of the diaphragm spring according to the first embodiment.

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a partially enlarged view of a diaphragm spring according to a second embodiment.

FIG. 7 is a view taken in the direction of arrows VII-VII in FIG. 6;

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is a partially enlarged view of a diaphragm spring according to a third embodiment.

FIG. 10 is a view taken in the direction of arrows XX in FIG. 9;

FIG. 11 is a sectional view taken along line XI-XI of FIG. 10;

FIG. 12 is a longitudinal sectional view of a clutch device including a clutch cover assembly according to a fourth embodiment of the present invention.

FIG. 13 is a partially enlarged view of a diaphragm spring according to a fourth embodiment.

FIG. 14 is a partially enlarged view of a conventional diaphragm spring.

FIG. 15 is a view taken in the direction of arrows XV-XV in FIG. 14;

16 is a sectional view taken along the line XVI-XVI in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clutch cover assembly 2 Clutch cover 3 Pressure plate 4, 8 Diaphragm spring 11, 82 Pressing part 12, 81 Supporting part 13 Lever part 13a Outer peripheral lever part 13b Inner peripheral lever part 13c Rib 13f Bending part 50 Flywheel (drive member) 51 Clutch disk (driven member) 52, 53 Release member

Claims (7)

[Claims] 1. A diaphragm spring of a clutch cover assembly mounted on a driving member together with a clutch cover and pressing a driven member against the driving member via a pressure plate in conjunction with a release member, wherein the clutch cover is A pressing portion formed on the outer peripheral side of the supporting portion and pressing the pressure plate against the driven member; an inner peripheral end extending from the supporting portion to the inner peripheral side; A plurality of lever portions abutting on the release member, and a rib extending in a radial direction and extending to an inner peripheral end of the lever portion is formed on the lever portion; A diaphragm spring in which the release member comes into contact with a portion raised by the formation of the diaphragm spring. 2. A diaphragm spring of a clutch cover assembly mounted on a driving member together with a clutch cover and pressing a driven member against a driving member via a pressure plate in conjunction with a release member, wherein the clutch cover is provided. A pressing portion formed on the outer peripheral side of the supporting portion and pressing the pressure plate against the driven member; and an inner peripheral lever portion having an inner peripheral end abutting on the release member. And an outer peripheral lever portion having a circumferential width smaller than a circumferential width of an outer peripheral end of the inner peripheral lever portion and connecting an outer peripheral end of the inner peripheral lever portion and the support portion, A plurality of lever portions extending inward from the support portion, wherein a circumferential end of the inner peripheral lever portion of the lever portion is bent. . 3. A diaphragm spring of a clutch cover assembly mounted on a driving member together with a clutch cover and pressing a driven member against a driving member via a pressure plate in conjunction with a release member, wherein the clutch cover is provided. A pressing portion formed on the outer peripheral side of the supporting portion and pressing the pressure plate against the driven member; and an inner peripheral lever portion having an inner peripheral end abutting on the release member. And an outer circumferential lever portion having a circumferential width smaller than the circumferential width of the outer circumferential end of the inner circumferential lever portion and connecting the outer circumferential end of the inner circumferential lever portion to the support portion. A plurality of lever portions extending inward from the support portion, wherein both end portions of the inner peripheral lever portion of the lever portion in the circumferential direction are bent, and the lever portion has The extending radially are followed rib formed to the inner peripheral side leading end of the lever portion, said release member abuts the raised portion by the formation of the ribs of the lever portion, the diaphragm spring. 4. A diaphragm spring of a clutch cover assembly mounted on a driving side member together with a clutch cover and pressing a driven member against a driving member via a pressure plate in conjunction with a release member, wherein the clutch cover A pressing portion formed on the inner peripheral side of the supporting portion and pressing the pressure plate against the driven member; an inner peripheral end extending from the pressing portion to the inner peripheral side; And a plurality of lever portions that are in contact with the release member. A rib extending in a radial direction and extending to an inner peripheral end of the lever portion is formed on the lever portion. A diaphragm spring in which the release member comes into contact with a raised portion due to the formation of a rib. 5. A diaphragm spring of a clutch cover assembly mounted on a driving member together with a clutch cover and pressing a driven member against a driving member via a pressure plate in conjunction with a release member, the clutch cover comprising: A pressing portion formed on the inner peripheral side of the supporting portion and pressing the pressure plate against the driven member; and an inner peripheral lever having an inner peripheral end abutting on the release member. And an outer peripheral lever portion having a circumferential width smaller than the circumferential width of the outer peripheral end of the inner peripheral lever portion and connecting the outer peripheral end of the inner peripheral lever portion and the support portion, A plurality of lever portions extending inward from the pressing portion, wherein a diaphragm spring has both ends in the circumferential direction of the inner peripheral lever portion of the lever portion bent. . 6. A diaphragm spring of a clutch cover assembly mounted on a driving member together with a clutch cover and pressing a driven member against a driving member via a pressure plate in conjunction with a release member, wherein the clutch cover A pressing portion formed on the inner peripheral side of the supporting portion and pressing the pressure plate against the driven member; and an inner peripheral lever having an inner peripheral end abutting on the release member. And an outer peripheral lever portion having a circumferential width smaller than the circumferential width of the outer peripheral end of the inner peripheral lever portion and connecting the outer peripheral end of the inner peripheral lever portion to the support portion. A plurality of lever portions extending inward from the pressing portion, wherein both end portions in the circumferential direction of the inner peripheral lever portion of the lever portion are bent, and the lever portion has The extending radially are followed rib formed to the inner peripheral side leading end of the lever portion, said release member abuts the raised portion by the formation of the ribs of the lever portion, the diaphragm spring. 7. A clutch cover assembly for pressing or releasing a driven member against a driving member, comprising: a clutch cover fixed to the driving member; and a clutch on an inner peripheral side of the clutch cover. A clutch cover assembly comprising: a pressure plate disposed so as to be relatively non-rotatable with respect to the cover and movably in the axial direction; and the diaphragm spring according to claim 1 supported by the clutch cover. Three-dimensional.