JPH03134318A - Clutch cover assembly - Google Patents

Abstract

PURPOSE:To maintain the height of a supporting point by providing a slide block having a ratchet between a pressure plate and a full clam ring, and making a wedge portion of the slide block bite by abrasion of a facing. CONSTITUTION:A facing 7, a pressure plate 3 and a diaphragm spring 12 are disposed in order from the fly wheel 1 side in a clutch cover 2. A full clam ring 17 is fitted in a circular recess portion 16 in such a manner as to slide in the axial direction, the forward end supporting point A is pressed to a diaphragm spring 12, and the rear end inclined surface 19 is pressed to a wedge portion 21 of a slide block 20. A ratchet click 29 of a sensing lever 28 is meshed with a ratchet tooth 23 of the slide block 20. When a facing 7 is worn away, the ratchet tooth increases the push-in supporting point height due to release. Accordingly, the supporting point height is increased according to abrasion to maintain the initial set load.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clutch cover assembly including a diaphragm spring.

(Prior art) In this type of clutch cover assembly,
There is a great demand for longer life of clutches in automobiles and commercial vehicles. As an example of extending the life of the clutch, attempts have been made to increase the effective usable thickness of the facing by fixing the facing to the clutch disk without using rivets or the like.

However, a general clutch cover assembly has a structure, for example, as shown in FIG. 4, and as shown in FIG. 5, wear-in compensation is ensured by the load characteristics. However, since there is a limit to the width of the wear-in substitute, when the amount of wear on the facing 7 increases, the pressing force 6:1 changes from the initial set position Ps and passes the peak (an increase in pedal force).
After that, it gradually decreases. Finally, as the diaphragm spring 12 tilts significantly toward the pressure plate, the pressing load is insufficient and slippage occurs, making it impossible to utilize the facing 7 to its maximum wear amount.

(Objective of the Invention) The present invention aims to extend the life of the clutch and stabilize its performance by automatically maintaining the initial fulcrum height and set load in accordance with the amount of wear on the facing. There is.

(Technical Means for Achieving the Object) In order to achieve the above object, the present invention supports a fulcrum ring so as to be able to slide in the axial direction on a pressure plate, and the distal fulcrum of the fulcrum ring is connected to the A peripheral fulcrum of the diaphragm spring. A slide block having a wedge portion between the fulcrum ring and the pressure plate is arranged so as to be movable in the radial direction, and the slide block is formed with a plurality of ratchet teeth aligned in the radial direction, and when the clutch is connected, A sensing lever that comes into contact with the outer circumferential edge of the diaphragm spring to sense the inclination of the diaphragm spring when the facing is worn is movably supported on the pressure plate, and the sensing lever has a ratchet pawl that engages with the ratchet teeth. The biasing spring biases the slide block in the direction of pushing it toward the center of the clutch, and the swinging of the sensing lever caused by the release operation when the facing wears causes the wedge part of the slide block to be pushed in by the ratchet pawl so that the fulcrum height becomes higher. I'm trying to get into it.

(Example) FIG. 1 is a longitudinal cross-sectional view of a clutch cover assembly to which the present invention is applied, in which the clutch cover 2 is disposed axially forward with respect to the input end flywheel 1, and the outer peripheral end is secured by rivets. It is rotated on the front end surface of the flywheel 1. Inside the clutch cover 2, a clutch disc facing 7, a pressure plate 3, and a diaphragm spring 12 are arranged in order from the flywheel side, and although the pressure plate 3 is not shown, the outward protrusion on the outer periphery is a strap plate (Fig. 4). plate 5
(equivalent to)) is connected to the clutch cover 2 so as to be elastically movable in the axial direction.

The diaphragm spring 12 has an intermediate supporting point C2 held between two wire rings 11, and the wire rings 11 are held in a circular shape by a plurality of tags 10 formed on the inner peripheral end of the clutch cover 2. Although not shown, the inner peripheral end faces the release bearing. That is, by pushing the inner circumferential end of the diaphragm spring 12 rearward with the release bearing, the outer circumferential end of the diaphragm spring 12 is moved forward using the intermediate fulcrum C2 as a rotational fulcrum.

An annular recess 16 is formed on the front surface of the pressure plate 3, and radial block fitting grooves 15 are formed at a plurality of locations spaced apart in the circumferential direction. A forward-protruding fulcrum ring 17 is fitted into the annular recess 16 so as to be able to slide in the axial direction, the front end fulcrum A1 of the fulcrum ring 17 abuts the outer peripheral fulcrum C1 of the diaphragm spring 12, and the rear end surface of the fulcrum ring 17 is An inclined surface 19 is formed which becomes more forward as it goes outward in the radial direction.

A slide block 20 is fitted into the block fitting groove 15 so as to be slidable in the radial direction.
The inner wedge portion 21 of 0 is formed with an inclined surface 21 a that comes forward as it goes outward in the radial direction, and the inclined surface 21 a is in contact with the rear end inclined surface 19 of the fulcrum ring 17 . A plurality of ratchet teeth 23 are formed on the outer front surface of the slide block 20 so as to be aligned in the radial direction. The tips of the ratchet teeth 23 are inclined radially outward, and can be inserted radially inward.

As shown in FIG. 2, a pair of boss portions 25 are formed on both sides of the block fitting groove 15 in the circumferential direction, and extend forward.
A sensing lever 28 is rotatably fitted into a bin 26 supported on both sides by the boss portion 25. As shown in FIG. 1, the sensing lever 28 is integrally equipped with a sensing portion 28a extending radially inward and a ratchet pawl 29 extending rearward, and the ratchet pawl 29 meshes with the ratchet teeth 23 of the slide block 20. There is. The sensing lever 28 is a coiled spring 3
1 in the direction of arrow X1, the stopper bin 32
It is locked in the state shown in FIG. 1. That is, the first
In the clutch connected state at the time of setting as shown in the figure, the sensing portion 28a of the sensing lever 28 is located in the same vertical plane as the fulcrum At, and the ratchet pawl 29 engages with the ratchet teeth 23 to move the slide block 20 radially outward. Preventing movement.

The coiled spring 31 is placed in the notch 28c of the sensing lever 28 as shown in FIG. 2, and is wound around the bottle 26.
One end engages with the ratchet pawl 29, and the other end engages with the stopper pin 32.

Explain the operation. 1 shows the clutch connection state at the time of initial setting, the diaphragm spring 12 is set at the peak position Ps' in FIG. 5, and the outer peripheral edge 12a in FIG. are in contact.

When the outer peripheral end of the diaphragm spring 12 is moved forward as shown in the imaginary line by performing a release operation from the state shown in FIG. 1, the fulcrum ring 17 and the pressure plate 3 are moved forward by the restoring force of the strap plate. At this time, the outer peripheral edge 12a of the diaphragm spring 12 moves in a direction away from the sensing portion 28a, but the sensing lever 28
is kept locked by the stopper bin 32.

When the facing 7 wears out due to use, the diaphragm spring 12 becomes loose when the clutch is engaged, as shown in FIG.
(the outer circumferential part of the diaphragm spring 12 rises at an angle rearward), and the sensing part 28a is pushed by the outer peripheral edge 12a of the diaphragm spring 12, so that the sensing lever 28 rotates in the direction of arrow X2 against the spring 31, and the ratchet pawl 2 One comes to a position where it meshes with the next ratchet tooth 23 on the radially outward side.

If you release the camera from this state as shown by the imaginary line in Figure 3,
Since the holding force by the diaphragm spring 12 is released from the sensing portion 28a, the sensing lever 28 returns to the direction of arrow X1 due to the elastic force of the spring 31, and at this time, the ratchet pawl 29
Pushes the slide block 20 radially inward by one ratchet tooth, pushes the fulcrum ring 17 forward by the wedge action of the inclined surface 21a, and increases the height of the fulcrum.

As the wear of the facing 7 progresses, the ratchet pawl 29 sequentially engages with the ratchet teeth 23 on the radially outer side by the same operation as described above, and the slide block 29 is pushed inward. That is, as the amount of facing wear increases, the fulcrum ring 17 automatically moves forward and becomes higher by an amount approximately corresponding to the amount of wear), and the diaphragm spring 12 is maintained in the initial state as shown in FIG.

(Effects of the Invention) As explained above, according to the present invention: (1) When the facing is worn out, the fulcrum height can be automatically increased in accordance with the amount of wear on the facing 7 by simply performing the normal pull/rise operation. can.

Therefore, the facing can be used to its maximum wear limit without any maintenance, the period until clutch replacement can be extended, and the life of the clutch can be improved.

(2) Since the fulcrum height automatically increases in accordance with the amount of wear on the facing 7, the set load can always be kept at a constant value during the period of use.

That is, by setting the set load at the peak of the load characteristics during assembly, the above assembly can always maintain the same set load regardless of the wear of the facing, and the torque transmission performance of the clutch will not change.

(3) Since the fulcrum height is automatically increased in accordance with the amount of wear on the facing 7, the attitude (inclination) of the diaphragm spring 12 does not change when the clutch is connected, and the release characteristics do not change.

Therefore, the camera can always be released using the same release operation.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the clutch connection state at the initial setting of the clutch cover assembly to which the present invention is applied, Fig. 2 is a cross-sectional view of Fig. 1, and Fig. 3 is the clutch connection state when the facing is worn. FIG. 4 is a vertical cross-sectional view of the conventional example, and FIG. 5 is a load characteristic diagram. 1...
Flywheel, 2. Clutch cover, 3... Pressure plate, 7... Facing, 12... Diaphragm spring, 17... Fulcrum ring, 20.
...Slide block, 23...Ratchet teeth, 28
...Sensing lever, 29...Ratchet pawl, 31...
・Spring,

Claims (1)

[Claims] A fulcrum ring is supported by the pressure plate so as to be slidable in the axial direction, and the tip fulcrum of the fulcrum ring is brought into contact with the outer peripheral fulcrum of the diaphragm spring, so that a slide block having a wedge portion between the fulcrum ring and the pressure plate can be moved in the radial direction. The slide block has a plurality of ratchet teeth aligned in the radial direction, which presses a sensing lever that comes into contact with the outer peripheral edge of the diaphragm spring when the clutch is engaged and senses the inclination of the diaphragm spring when the facing wears. It is rotatably supported on the plate, and the sensing lever has a ratchet pawl that engages with the ratchet teeth, and a biasing spring biases the slide block in the direction of pushing it toward the center of the clutch. When the facing wears, it can be detected by the release operation. A clutch cover assembly characterized in that, as the lever swings, a ratchet pawl bites into a wedge portion of a slide block so that the height of the fulcrum increases.