JPH0231025A - Clutch cover assembly body - Google Patents

Abstract

PURPOSE:To absorb the shock in the engagement of a clutch by fixing a diaphragm spring to control the operation of the clutch engaging and disengaging directions to a clutch cover immovable in the radial direction through a spring deformed in the direction of the clutch axis. CONSTITUTION:A support plate 3 is provided at the outer periphery of a clutch disk 2, friction facings 4 are stuck to both sides of the support plate 3 by a molding, and the clutch disk 2 is positioned between a flywheel 5 and a pressure plate 6. A release bearing 11 is linked to the tongue 10 of a diaphragm spring 8, and when the diaphragm spring 8 is moved from the clutch disengaging position 8a to the perfect engaging position 8b, its periphery 9 and the pressure plate 6 are moved to the flywheel 5 side through the engagement starting position up to the perfect engaging position. In such a process of movement of the pressure plate 6 from the engagement starting position to the perfect engaging position, the reaction force from the pressure plate 6 compresses a spring 20 through the periphery 9, wirings 12 and 13, and a stud pin 15, and a shock at the engagement of the pressure plate 6 to the friction facing 4 is weakened.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a friction clutch used in automobiles, etc., and particularly relates to a diaphragm spring for controlling the engagement/disengagement operation of the clutch in such a latch, and the like. Intended for assembly with clutch cover to support.

[Prior Art] In a clutch disk of a friction clutch generally used in automobiles, a friction facing is fixed to a cushioning plate with rivets. The cushioning plate is a member that can be elastically deformed in the clutch axial direction,
The cushioning plate deforms in the clutch axial direction during the clutch engagement operation, thereby preventing shock when the clutch is engaged.

[Problem 8 to be solved by the invention] However, in the clutch disk using the cushioning plate as described above, it is necessary to fix the friction facing to the cushioning plate with rivets.

Therefore, there is a problem in that when the friction facing is worn to a certain extent and the head of the rivet is exposed on its surface, the friction facing cannot be used any longer. That is, in a clutch disk using a cushioning plate, the life of the friction facing is shortened.

Also cushioning plate and rib 1. ．． When a clutch disk is used, the amount of ffl becomes relatively large, and there is also the problem that the rotational inertia of the clutch disk as a whole becomes large.

As a countermeasure to this problem, some clutch disks have already adopted a method of fixing the friction facing to the support plate by molding without using rivets. Although this structure can prevent the above problems, it is not possible to make the support plate elastically deformable in the axial direction.

As a result, there is a problem in that the friction facing suddenly comes into pressure contact with the flywheel or pressure plate during the clutch engagement operation, resulting in a shock when the clutch is engaged.

In order to solve these problems, the present invention provides a structure in which a clutch cover assembly can absorb shock when the clutch is engaged.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a diaphragm spring that controls the operation of the pressure plate in the clutch connection/disengagement direction, and a diaphragm spring that is seated on both sides of the diaphragm spring to form its fulcrum. and a clutch cover that supports the fulcrum from the side opposite to the diaphragm spring in a state where the fulcrum cannot be moved in the radial direction via the support, and the support can be elastically deformed in the clutch axial direction. It is characterized by being fixed to the clutch cover via a spring.

[Operation] According to the above structure, during the clutch engagement operation, the diaphragm spring deforms around the part supported by the fulcrum, and the part of the diaphragm spring connected to the pressure plate and the pressure plate change from the clutch disengagement position to the clutch engagement start position. , and then move to the flywheel side until the clutch is fully connected.

In the above operation, the pressure plate is in contact with the friction facing at the clutch engagement start position, but no substantial pressing force is exerted on the friction facing. Therefore, while the shaker plate moves from the cutoff position to the connection start position, the pressure plate does not substantially exert a reaction force on the diaphragm spring, and the diaphragm spring passes through the fulcrum part and the support part. No force is applied in the compressive direction. Therefore, the position of the fulcrum does not change.

During the process in which the pressure plate moves from the connection start position to the complete connection position, the pressure plate presses the IY friction facing against the flywheel, so a reaction force is exerted from the pressure plate against the diaphragm spring. For this purpose, the diaphragm spring is compressed via the fulcrum and the support. This elastic deformation acts to weaken the pressing force of the pressure plate against the friction facing, and the impact when the pressure plate contacts the friction facing is buffered by the elastic deformation. Therefore, the friction facing does not come into sudden pressure contact with the flywheel or the pressure plate, thereby preventing the clutch from suddenly engaging.

[Example 1] In Fig. 1, a conventional cushioning plate is not provided on the outer periphery of the clutch disc 2 connected to the output shaft 1 (center line only); instead, a flat (in the clutch axial direction) A support plate 3 (which does not undergo elastic deformation) is provided, and friction facings 4 are attached to both sides of the support plate 3 by molding. A friction facing 4 is located between the flywheel 5 and the pressure plate 6. The outer periphery and rear outer periphery of the pressure plate 6 are covered with a clutch cover 7. The outer periphery of the clutch cover 7 is fixed to the flywheel 5. A diaphragm spring 8 is provided between the back surface of the pressure plate 6 and the clutch cover 7. The diaphragm spring 8 is an annular continuous part (
9) and a plurality of tongue portions 10 (only one is shown) extending radially inward from the inner periphery of the annular portion 9. The outer periphery of the annular portion 9 engages with a protrusion provided on the back surface of the pressure plate. A release bearing 11 is connected to the inner peripheral portion of the tongue portion 10.

Wire rings 12 and 13 are provided on both sides of the inner circumference of the annular portion 9.
(fulcrum part) is seated. Wire ring 12.13
is a member that forms the fulcrum of the diaphragm spring 8,
Their inner peripheries are immovably supported in the clutch radial direction by a plurality of stud pins 15 (only one is shown). The stud pins 15 are arranged at intervals in the clutch circumferential direction, each extending in the clutch axial direction (direction parallel to the output shaft 1), and one end is connected to the clutch cover 7 via a spring 20 (described later). is fixed to the inner periphery of the Stud pin 15 is diaphragm spring 8
It extends between the diaphragm spring 8 and the pressure plate 6 through the slit (the space between two adjacent tongues 10), and has an outward flange 1 at its tip.
6 is integrated. One wire ring 12 is held between the flange 16 and the diaphragm spring 8. The other wire ring 13 is in contact with the diaphragm spring 8 from the side opposite to the wire ring 12, and is held between the diaphragm spring 8 and the spring 20.

The spring 20 has an annular shape with a radial cross section extending generally in the clutch radial direction, and one end of the stud pin 15 is fixed to the inner circumferential portion. The outer peripheral portion of the spring 20 is seated on the inner surface of the inner peripheral portion of the clutch cover 7 (the surface on the pressure plate 6 side) and is fixed by a rivet 21.

The specific shape of the spring 20 can be set in various ways, for example, the first
As shown in FIG. 2, which is a schematic view taken along arrows 1--2 in the figure, the inner and outer peripheries may each be constructed of an annular member extending at the same radius over the entire periphery.

Further, as shown in FIGS. 3 and 4, only the portion of the stud pin 15 (FIG. 1) that forms the mounting hole 22 may be shaped to protrude radially inward.

The diaphragm spring 8 shown by a solid line in FIG.
b represents the clutch fully engaged position. According to the above structure, in the clutch connection operation, the diaphragm spring 8 deforms around the part supported by the wire ring 12, 13, and the outer circumference of the diaphragm spring 8 and the pressure plate 6 move from the clutch disengagement position to the clutch connection start position. , and then moves to the flywheel 5 side to the clutch fully connected position.

In this operation, the pressure plate 6 is in contact with the friction facing 4 at the clutch connection start position shown by the solid line, but no substantial pressing force is exerted on the friction facing 4. Therefore, while the pressure plate 6 is moving from the cutoff position to the connection start position, no reaction force is substantially exerted from the pressure plate 6 on the diaphragm spring 8, and the diaphragm spring 8
Therefore, no force in the compression direction is applied to the spring 20 via the wire ring 13 or the stud pin 15. Therefore, the positions of the wire rings 12, 13 and the stud pins 15 do not change.

During the movement of the pressure plate 6 from the connection start position to the complete connection position, the pressure plate 6 presses the friction facing 4 against the flywheel 5, so that a reaction force is exerted from the pressure plate 6 on the diaphragm spring 8. For this purpose, the diaphragm spring 8 compresses the spring 20 via the wire ring 13 and the stud pin 15, and
The fifth class moves in a direction away from the flywheel 5. This compressive deformation acts to weaken the pressing force of the pressure plate 6 against the friction facing 4, and the impact when the pressure plate 6 contacts the friction facing 4 is buffered by the elastic deformation. Therefore, the friction facing 4 does not suddenly come into pressure contact with the flywheel 5 or the pressure plate 6, and therefore the clutch is prevented from suddenly engaging.

[Effects] As explained above, according to the present invention, the wire ring (
A spring 20 is attached to the stud pin 15, which is the support part of the fulcrum part), so that the spring 20 can absorb the shock when the clutch is connected, so that it has elasticity in the axial direction as a friction facing support member for the clutch disc 2. Therefore, the friction facing 4 can be mounted by molding, which can extend its life, reduce the weight of the outer periphery of the clutch disc, and reduce the rotational inertia of the clutch disc 2. can be lowered.

In other words, even in a clutch that uses a flat support plate 3 as a friction facing support member, according to the present invention, the friction facing 4 can suddenly contact the flywheel 5 or the pressure plate 6 due to the elastic deformation of the spring 20 of the clutch cover assembly. Since pressure contact can be prevented, the clutch can be connected smoothly.

[Another Embodiment] In the embodiment shown in FIG. 5, the fulcrum portion corresponding to the wire ring 13 in FIG. Only ring 12 is supported. Also, spring 20
is fixed to the outer surface of the inner circumference of the clutch cover 7.

With this structure, the same effect as the structure shown in FIG. 1 can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention, and FIGS.
Each figure is a schematic plan view of a spring of another embodiment, and FIG. 5 is a schematic cross-sectional view of another embodiment. 6...Pressure plate, 7...Clutch cover, 8...Diaphragm spring, 12.13...
Wire ring (fulcrum part), 15... stud pin (
support part), 20... spring

Claims (1)

[Claims] A diaphragm spring that controls the operation of the pressure plate in the clutch connection/disengagement direction, a pair of fulcrum parts that sit on both sides of the diaphragm spring and form the fulcrum, and the fulcrum parts cannot be moved in the radial direction via the support part. What is claimed is: 1. A clutch cover assembly comprising: a clutch cover that supports the diaphragm spring from the opposite side in this state; and the supporting portion is fixed to the clutch cover via a spring that is elastically deformable in the clutch axial direction.