JPH0243926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a clutch, and more particularly to one in which the mass of the clutch disk is reduced.

(Prior art) This technology reduces the weight of the clutch by omitting the shock-absorbing spring member known as a cushioning plate that conventionally fixes the facing of the clutch to the clutch disk (Japanese Patent Application Laid-open No. 13125/1983, Japanese Utility Model Publication No. 13125/1983,
- No. 2337) has been developed.

In these prior art, the wire ring that supports the diaphragm spring has a function as a buffer spring, but in the structure of such prior art, the fulcrum position of the diaphragm spring moves,
There is a problem that the characteristics of the diaphragm spring are not stable. Therefore, there is a problem in that the release characteristics of the clutch deteriorate.

(Objects of the Invention) It is an object of the present invention to provide a clutch which can reduce the weight of the clutch by omitting a shock absorbing spring member for fixing the facing, and which can improve release characteristics.

(Structure of the Invention) In a clutch in which a support member provided at a contact portion between a pressure plate and a diaphragm spring is provided on the pressure plate via an elastic member, the pressure plate A large recess into which a portion is slidably fitted in the axial direction, a narrow recess formed approximately at the center bottom of the large recess, and a ventilation hole in the radial direction of the clutch that communicates the large recess with the outside, The elastic member includes a main body accommodated in the wide recess with a gap in the clutch radial direction, and a protrusion that fits in the narrow recess to prevent the main body from moving in the clutch radial direction. It is a clutch to do.

(Embodiment) In FIG. 1 showing a clutch to which the present invention is applied, a clutch cover 12 is fixed to the rear surface of a flywheel 10. As shown in FIG. A pressure plate 14 is housed within the clutch cover 12.
Pressure plate 14 and flywheel 10
A clutch disk 13 is sandwiched between the two. The contact surfaces between the clutch disk 13, the flywheel 10, and the pressure plate 14 serve as clutch friction parts.

A diaphragm spring 16 is in pressure contact with the rear surface of the pressure plate 14, and the diaphragm spring 16 is attached to the tab 1 of the clutch cover 12.
8 and a wiring 20 to the clutch cover 12.

A forged fulcrum ring 22 (support member) is provided on the contact surface of the pressure plate 14 with the diaphragm spring 16, and the fulcrum ring 22 is attached to the pressure plate 14.
It is a continuous annular shape that extends around the entire circumference.

The cross-sectional shape of the Fulcrum ring 22 is such that the center part of the rear surface protrudes in a chevron shape, and the diaphragm spring 16
forming a contact surface 24 with the pressure plate 1
A projecting peripheral wall 25 is formed on the fourth side. Projection wall 2
5 is a groove 2 formed in the pressure plate 14;
6, and the Fulcrum ring 22 is slidably attached to the pressure plate 14.

An annular rubber ring 28 (elastic member) is interposed between the bottom surface of the groove 26 and the projecting peripheral wall 25 over the entire circumference. A protrusion 30 is formed on the contact surface of the rubber ring 28 with the groove 26.
2 is fitted. For example, the rubber ring 28 is 2 mm.
It is designed to generate a large elastic force equivalent to that of a conventional cushioning plate with a small stroke S of ~3 mm. Note that the reference numeral 31 is a ventilation hole, and the ventilation hole 31 allows the air in the groove 26 to circulate, thereby making the sliding movement of the Fulcrum ring 22 smooth.

The clutch disk 13 is provided with a driven plate 34 that transmits the transmitted torque without buffering, and thin and lightweight facings 36 are fixed on both sides of the outer periphery of the driven plate 34 by molding or adhesive. There is.

Note that 38 is a release bearing that is linked to the clutch pedal by a lever mechanism (not shown).

Next, the operation will be explained. First, in the clutch connected state, as shown in FIG. The signal is transmitted to a transmission (not shown).

To disengage the clutch, the clutch pedal is depressed and the release bearing 38 pushes the inner circumference of the diaphragm spring 16 forward. As a result, the diaphragm spring 16 is deformed as shown by the two-dot chain line in the figure, and the pressure plate 14 releases its pressing force against the facing 36.

In both of these connected and disconnected states, the clutch cover 12 is connected to the flywheel 1.
The diaphragm spring 16
and the wiring 20 also constantly rotate.

When the clutch is engaged and engaged, the change in the transmitted load P with respect to the release amount δ from the fully depressed state of the clutch pedal is as shown in characteristic 40 in FIG. The clutch release feels more natural to the operator than the characteristic 42 in which the load P increases rapidly when a cushioning plate is used instead of the driven plate 34 as in the past. can be,
The feeling when the clutch continues is good.

(Effects of the Invention) As explained above, according to the clutch of the present invention, the pressure plate 14 has a large recess into which a part of the support member (fulcrum ring 22) is fitted slidably in the axial direction. (groove 26), and a narrow recess (groove 32) formed approximately at the center bottom of the wide recess.
and a ventilation hole 31 in the clutch radial direction that communicates the wide recess with the outside, and the elastic member (rubber ring 28) is arranged between a main body accommodated in the wide recess with a gap in the clutch radial direction, and a clutch radial ventilation hole 31 communicating with the outside. Since the projection 30 fits into the recess and prevents the main body from moving in the radial direction of the clutch, even if a strong centrifugal force is applied to the elastic member during clutch operation, the projection 30 of the elastic member will have a small width. By fitting into the recess, the elastic member does not rub against the inner wall of the large recess. As a result, the accuracy of the spring characteristics is improved and the durability is also increased. Moreover, since the large concave portion is equipped with a ventilation hole 31 in the clutch radial direction,
While the support member presses the elastic member, the air in the gap between the inner wall of the large recess and the outer circumferential surface of the elastic member,
It is discharged to the outside through this ventilation hole 31. Therefore, the support member slides smoothly, and the air within the gap does not adversely affect the spring characteristics. Therefore, the spring characteristics are improved from this point as well. Furthermore, since the ventilation holes 31 also have a heat dissipation function, they also have the function of cooling the pressure plate 14.

Further, by employing the present invention, the facing 36 can be made of a thin and lightweight molded type, so that the mass of the clutch disk 13 can be significantly reduced. When the mass of clutch disk 13 decreases, clutch disk 1
Since the shaft 3 is connected to the main shaft provided with the synchronizing mechanism of the transmission, the time required for the cycle of the synchronizing mechanism can be shortened, and the operability of the shift lever of the transmission can be improved.

In addition, the impact when the clutch is continued is buffered by the rubber ring 28 interposed between the fulcrum ring 22 and the pressure plate 14.
Clutch continuation can be made smoother. Moreover, since the Fulcrum ring 22 and the rubber ring 28 are separate bodies, and the sliding amount of the Fulcrum ring 22 is only a small stroke S, the contact state between the diaphragm spring 16 and the contact surface 24 hardly changes. The pressing force from the diaphragm spring 16 is always kept stable on the pressure plate 14.
It is possible to stabilize the release characteristics of the clutch.

(Another Embodiment) (1) As shown in FIG.
can also be engaged in the groove 46 to inhibit movement in the circumferential direction.

(2) Also, as shown in FIG. 4, pivots 52 may be provided at a plurality of positions in the circumferential direction of the pressure plate 14. In this case, a cylindrical rubber buffer 5
4 is formed with a protrusion 56.

(3) The supporting member is not limited to the Fulcrum ring 22 having the projecting peripheral wall 25, but may also be a pad attached to the pressure plate 14 via a rubber sheet. It is sufficient if it is provided via a member.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a clutch to which the present invention is applied, Fig. 2 is a graph showing the relationship between clutch pedal release amount and transmitted load, and Figs. 3 and 4 each show another embodiment of the present invention. It is a partial perspective view of a pressure plate. 14...Pressure plate, 16...Diaphragm spring, 22...Fulcrum ring (support member), 26...Groove (large recess), 28...Rubber ring (elastic member), 30, 56...Protrusion, 31...Vent hole , 32... Groove (narrow recess), 34... Driven plate, 36... Facing.

Claims (1)

[Claims] 1. In a clutch in which a support member provided at a contact portion between a pressure plate and a diaphragm spring is provided on the pressure plate via an elastic member, the pressure plate is such that a part of the support member is attached to the shaft. The elastic member includes a wide recess that is slidably fitted in the clutch, a narrow recess that is formed approximately at the center bottom of the wide recess, and a ventilation hole in the radial direction of the clutch that communicates the wide recess with the outside. , comprising a main body accommodated in the wide recess with a gap in the clutch radial direction, and a protrusion that fits in the narrow recess to prevent the main body from moving in the clutch radial direction. Clutch.