JPH0223857Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a clutch disk used in a dry single plate clutch of a power transmission device for a vehicle.

Prior Art In such a clutch plate, a plurality of cushion plates are arranged circumferentially and attached to the outer periphery of a disk-shaped clutch plate, and clutch facings are attached to both sides of the clutch plate. When the clutch is engaged, the cushion plate is compressed to buffer torque fluctuations, and the stroke length of the clutch pedal, which corresponds to a half-clutch, is increased to improve the operability of the clutch. The operability of the clutch is determined by the larger the difference in length in the pressing direction of the cushion plate corresponding to the pressing force at the start and end of half-clutching, that is, the smaller the spring constant of the cushion plate, the smaller the spring constant of the cushion plate.
However, with a cushion plate having a small spring constant, the amount of change in the length of the cushion plate required to bring the clutch into a fully connected state increases, resulting in a decrease in the amount of remaining clutch disengagement.

For this reason, in the clutch disk disclosed in Japanese Utility Model Application Publication No. 59-17328, a locking member is attached between the rivet that fixes one clutch facing to the cushion plate and the other clutch facing, and the clutch disk is fixed to the cushion plate. is prevented from returning to its free length, thereby suppressing an increase in the amount of change in the length of the cushion plate required for clutch operation. However, with this clutch disk, it is necessary to assemble the locking member to the rivet, and the other clutch facing needs to be formed with a step that is locked to the locking member, making the structure complicated. .

Problems to be Solved by the Present Invention The purpose of the present invention is to omit additional members, to avoid complicating the structure, and to maintain a small amount of change in the cushion plate required for clutch operation. An object of the present invention is to provide a clutch disc that can improve the operability of the clutch.

Means for Solving the Problems In order to achieve this object, the clutch disk of the present invention has such a structure that when the clutch is released, the ends of the cushion plates in the circumferential direction of the clutch disk abut each other, thereby increasing the length of the cushion plates in the pressing direction. The ends of adjacent cushion plates overlap in the circumferential direction of the clutch disk so as to limit an increase in the clutch disk.

Effects of the invention When the clutch is released, the length of the cushion plate in the pressing direction tends to increase due to the restoring force of the cushion plate, but when this length exceeds a predetermined value, the ends of each cushion plate come into contact with each other. This length is kept below a predetermined value. As a result, the amount of change in the length of the cushion plate required for the operation of releasing and engaging the clutch is maintained at a small value despite the reduction in the spring constant, and the amount of change in the length of the cushion plate required for the operation of releasing and engaging the clutch is maintained at a small value. Operability can be improved.

In the present invention, it is sufficient to simply overlap the ends of the cushion plates, so additional members can be omitted and the structure can be avoided from becoming complicated.

Example A drawing embodiment of the present invention will be described.

In FIG. 3, the spline hub 10 includes a spline 12 that fits into an input shaft (not shown) of a transmission.
is provided on the inner peripheral surface, and an annular flange 14 is integrally provided on the outer peripheral surface. Hysteresis torque generating sections 16 and 18 are arranged along the inner periphery of both sides of the flange 14, and a pair of annular clutch plates 20 and retaining plates 22 are provided on both sides of the flange 14 with the torque generating sections 16 and 18 in between. are arranged. Flange 14 and both plates 20, 22
There are multiple window holes 2 in each part near the outer periphery.
4, 26, and 28 (only one of each is shown) are provided at intervals in the circumferential direction of the clutch disk. The window holes 24, 26, 28 are opposed to each other in the axial direction of the clutch disk, and one set of three window holes 24, 2
6 and 28 are fitted with torsion springs 30. Each spring 30 extends in the circumferential direction of the clutch disk, the flange 14 and both plates 20, 22 are elastically connected by the spring 30, and the outer peripheries of both plates 20, 22 are connected by a stop pin 32. There is. The plurality of cushion plates 34 are arranged circumferentially on the outer periphery of the disk 20, and the pins 3 are arranged on the inner periphery.
6 is fixed to the outer periphery of the disk plate 20. Clutch facings 38 and 40 have a plurality of rivets 4 on both sides of the cushion plate 34.
It is fixed by 2.

1 and 2 show the cushion plate 34.
details. Each cushion plate 34
is an inner peripheral support part 4 that is applied to the outer peripheral part of the disk plate and fixed to the outer peripheral part by a pin 36.
8, and a peripheral cushion portion 50 to which the clutch facings 38, 40 are attached by means of rivet pins 42. Outer cushion part 50
is formed into a bent shape, and is applied to the inner surface of the clutch facing 38 so that the rivet pin 42
a flat portion 52 to which the clutch facing 38 is fixed, and a flat portion 54 to which the clutch facing 40 is fixed by the rivet pin 42, which is applied to the inner surface of the clutch facing 40;
It has planar stopper portions 56 located at both ends in the circumferential direction of the clutch disk. The stopper portion 56 is connected to the clutch facings 38, 4.
0, the cushion plate 34
are arranged so as to overlap in the stopper portions 56 in the circumferential direction of the clutch disk, and the stopper portions 56 are in abutment with each other when the clutch is released. In addition, 58 is clutch facing 38,
It is a stupid hole formed in 40.

The operation of the embodiment will be explained. When the clutch is released, the cushion plate 34 tends to expand in the axial direction of the clutch disk due to its restoring force, but the stopper portions 56 at the ends of adjacent cushion plates 34 abut against each other, preventing the axial expansion. is prevented. As a result, the distance between the outer surfaces of the clutch facings 38, 40 is maintained within a predetermined value, thereby avoiding problems such as a decrease in the remaining clutch clearance. When the clutch is engaged, the cushion plate 34 begins to flex when a pressing force exceeding the preload of the cushion plate 34 is applied to both sides of the clutch facings 38, 40.

FIG. 4 shows the relationship between the amount of increase from the length of the cushion plate in the pressing direction when the clutch pedal is fully returned and the pressing force applied to the clutch disk for an embodiment of the present invention. As the pressing force on the clutch disc decreases, the length of the cushion plate increases in the pressing direction. Increase amount is a predetermined value
When C1 is reached, the stopper portions 56 come into contact with each other and the cushion plate 34 is prevented from expanding, so that the amount of increase is limited to a predetermined value C1 or less. If there is no stopper portion 56 (dashed line), the cushion plate 34 will continue to expand as the pressing force decreases even after the amount of increase reaches the predetermined value C1, so the final amount of increase will be a large value and the clutch will increase. There is a problem that the uncut allowance decreases. For example, Pa and Pb are the pressing forces when torque transmission starts and when torque transmission is complete in the clutch, respectively, and the larger the difference between the increases Ca and Cb corresponding to the pressing forces Pa and Pb, the The stroke length of the clutch pedal, which corresponds to a half-clutch, is increased and the operability of the clutch is improved. For this reason, the cushion plate 34
It is preferable that the spring constant of is small. In the present invention, while using the cushion plate 34 having a small spring constant, it is possible to avoid an increase in the length of the cushion plate. Also, cushion plate 3
4, the characteristic line would be as shown by the broken line in FIG. 4, and there is a problem that abnormal vibrations of the cushion plate 34 may occur in the region where the cushion plate 34 has a predetermined spring constant. In this embodiment, the cushion plate 34 can be elastically deformed within its substantially linear characteristic range, and changes in the spring constant can be greatly suppressed, and a relatively small spring constant can be used, so that abnormal vibrations can be prevented. By avoiding the spring constant that occurs, it is possible to prevent abnormal noises during half-clutch operation.

The present invention is not limited to the above-mentioned embodiments, but
It will be apparent to those skilled in the art that the embodiments include various modifications.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main parts of the embodiment related to the present invention when viewed from the outside in the radial direction of the clutch disk;
Fig. 2 is a side view of the main parts of the embodiment, Fig. 3 is an overall view of the clutch disk, and Fig. 4 shows the relationship between the amount of increase in the length of the cushion plate in the pressing direction and the pressing force applied to the clutch disk. This is a graph showing. 20...Clutch plate, 34...Cushion plate, 38, 40...Clutch facing, 56...Stopper portion.

Claims (1)

[Scope of utility model registration request] In a clutch disk in which a plurality of cushion plates are arranged in a circumferential manner and are attached to the outer periphery of a disc-shaped clutch plate, and clutch facings are attached to both sides of the clutch plates, each cushion plate is attached when the clutch is released. A clutch disk characterized in that the ends of adjacent cushion plates overlap in the circumferential direction of the clutch disk such that the ends of the cushion plates abut each other and limit an increase in the length of the cushion plates in the pressing direction.