JPH0214661Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clutch disc in which a resin bushing is fitted around the outer periphery of a spline hub.

(Prior Art and Problems) As shown in FIG. 4, by fitting a resin bushing 15 to the outer peripheral surface of the spline hub 1,
Direct metal contact between the clutch plate 5 and the hub 1 is avoided to prevent fretting caused by metal rust. However, since the resin bush 15 and the friction washer 20 that twist against it come into contact with each other, the bush 1
5 is severely worn, which shortens its life and makes the hysteresis torque unstable.

(Purpose of the invention) The purpose of the invention is to stabilize the hysteresis torque and extend the life of the bushing by preventing contact between the friction washer and the bushing through a simple device.

(Means for achieving the object) In order to achieve the above object, the present invention includes a resin bush rotatably fitted on the outer circumferential surface of the spline hub, a side plate fitted on the outer circumferential surface of the bushing, and a side plate fitted on the outer circumference of the bush. A friction washer is fitted to the outer peripheral surface of the bushing with an annular gap therebetween, and a side plate that presses against the side surface of the friction washer is provided with a side plate for regulating displacement of the friction washer in the radial direction. It is characterized in that the positioning projections are cut and raised at a plurality of locations in the axial direction, and the cut and raised positioning projections are arranged to face the outer peripheral edge of the friction washer.

(Example) Fig. 1 shows a longitudinal sectional view of a clutch disk to which the present invention is applied.
is a spline hub on the output side, which is spline connected to the output shaft and is integrally provided with an outward flange portion 3. A clutch plate 5 and a retaining plate 6 are arranged at intervals on both sides of the flange portion 3, and both plates 5 and 6 are connected by a stud pin 7. A cushioning plate 8 is fixed to the outer periphery of the clutch plate 5, and input side facings 9 are fixed to both sides of the cushioning plate 8.
Although not shown, the facing 9 is intermittably held between the flywheel and the pressure plate.

Clutch plate 5 and retaining plate 6
A plurality of window holes 10 and 11 are formed in the
A window hole 12 corresponding to the window holes 10, 11 is also formed in the flange portion 3, and the window holes 10, 11, 1
A torsion spring 13 is disposed within 2.

A resin bush 15 is rotatably fitted on the outer circumferential surface of the spline hub 1 on the clutch plate 5 side, and a stepped portion 16 is formed on the outer circumferential surface of the bush 15. A clutch plate 5 is fitted onto the outer peripheral surface of the clutch plate 15. As shown in the upper half of FIG. 1, the bush 15 is formed with an outwardly directed pawl 17, and the pawl 17 engages with a notch 18 at the inner peripheral end of the clutch plate 5.
This allows the clutch plate 5 and bush 15 to rotate together.

Between the clutch plate 5 and the flange portion 3,
A first friction washer 20, a first sub-plate 21, and a second friction washer 22 are arranged in this order from the clutch plate 5 side. Between the flange part 3 and the retaining plate 6, a third friction washer 23, a friction plate 24, a wave spring 25, a second sub-plate 26, and a fourth friction washer 27 are arranged in order from the flange part 3 side. It is located. First,
The second sub-plates 21 and 26 are connected to each other by a sub-pin 30 and transmit rotational torque to the flange portion 3 via a sub-torsion spring 32. As shown in the lower half of FIG. 1, the friction plate 24 has an engaging projection 33 on its outer peripheral end, and the projection 33 engages with an engaging hole 34 of the second sub-plate 26. .

The inner circumferential diameters of the first and second friction washers 20 and 22 are formed to be slightly larger than the outer circumferential diameter of the bushing 15, and are fitted to the outer circumferential surface of the bushing 15 with an annular gap d therebetween. There is. The second friction washer 22 is fitted into the outer peripheral surface of an annular positioning portion 35 on the left wall of the flange portion 3, and the positioning portion 35 has a radius such that the second friction washer 22 does not come into contact with the bush 15. It controls the deviation in direction. On the other hand, the first friction washer 20
A positioning projection 36 for regulating radial displacement of the clutch plate 5 is formed integrally with the clutch plate 5 on the right side surface of the clutch plate 5.

The positioning protrusion 36 is formed by cutting and raising a part of the clutch plate 5 to the right side in FIG. , the inner peripheral edge of the first friction washer 20 is restricted from coming into contact with the bush 15.
As shown in FIG. 2, for example, three positioning projections 36 are formed on the same circumference at equal intervals in the circumferential direction. The inner peripheral edge and outer peripheral edge of the projection 36 are formed in an arc shape centered on the rotation center of the clutch.

(Function) When input from the flywheel to the facing 9, the clutch plate 5, retaining plate 6, and both sub-plates 21, 26 rotate integrally, and the rotational force is transmitted to the hub 1 via the torsion springs 13, 32. and further transmitted to the output shaft.

When the rotational torque starts to increase, both the sub-plates 21 and 26, together with the clutch plate 5 and the retaining plate 6, begin to twist in the rotational direction with respect to the flange portion 3, and the sub-torsion spring 3
Compress 2. At this time, hysteresis torque is generated due to sliding friction between the second and third friction washers 22 and 23.

As the rotational torque further increases, the clutch plate 5 and retaining plate 6 begin to twist in the rotational direction relative to the sub-plates 21 and 26, and the first and fourth friction washers 20 and 27
Hysteresis torque is generated due to sliding friction. In this case, the resin bush 15 rotates integrally with the clutch plate 5, but the projection 36 prevents the bush 15 from coming into contact with the first friction washer 20. No friction occurs between the shock washers 20.

(Another embodiment) (1) Instead of forming the positioning projection 36 on the clutch plate 5 as shown in FIG. 1, a positioning projection is formed on the first sub-plate 21 shown in FIG. It is also possible to restrict the displacement of the layer 20 in the radial direction. Also in this case,
A positioning protrusion that protrudes further to the right may be formed on the first sub-plate 21 to regulate the second friction washer 22.

(2) The example shown in FIG. 3 is an example in which the present invention is applied to a clutch disk in which a resin bushing 15 and a second friction washer 22 are formed as one body. Parts corresponding to those in FIG. 1 are given the same part numbers as in FIG. However, sub plate 21
A wave spring 25 is disposed between the flange portion 3 and the second friction washer 22, and only the third friction washer 23 is disposed between the flange portion 3 and the retaining plate 6. Further, in the embodiment shown in FIG. 3, a positioning protrusion 40 is provided on the retaining plate 6 for regulating the displacement of the third friction washer 23 in the radial direction. The third friction washer 23 has an outer circumferential end and an inner circumferential end with larger diameters in order to increase the friction radius, and the inner circumferential end of the third friction washer 23 is in contact with the outer circumferential surface of the hub 1. There is a gap separating them.

(3) The positioning protrusion may be formed in an annular shape with respect to the rotation center of the clutch disk.

(Effects of the invention) (1) Since the resin bushing 15 is rotatably fitted to the outer peripheral surface of the spline hub 1, and the side plate (for example, the clutch plate 5) is fitted to the outer peripheral surface of the bushing 15, Metal-to-metal contact between the hub 1 and the side plate that twists relative to the hub 1 can be avoided, thereby preventing fretting on the outer circumferential surface of the hub 1. Therefore, hysteresis is stabilized, and transmission noise caused by torsional vibration of the drive system can be prevented.

(2) A gap d is provided between the bushing 15 and the friction washer 20, and the positioning protrusion 36 restricts the displacement of the washer 20 in the radial direction to prevent the bushing 15 and the washer 20 from coming into contact with each other. It is possible to prevent the hysteresis from becoming unstable due to contact between the electrodes 15 and 20.

(3) Since the bush 15 and the friction washer 20 do not come into contact with each other, the wear of the resin bush 15 can be reduced and the durability of the bush 15 can be improved.

(4) The positioning protrusion 36 is the friction washer 2
Since it is formed so as to face the outer circumferential edge of 0, it is possible to secure a sufficient space for formation, and processing is easier, compared to, for example, when it is formed so as to face the inner circumferential edge. .

(5) As a positioning mechanism, a positioning projection 36 is formed by cutting and raising only on the side plate 5, and the projection 36 is opposed to the outer peripheral edge of the friction washer 20 to exert a positioning function. frixion washer 2
There is no need to form protrusions or holes for positioning.

That is, since there is no need to process protrusions, holes, etc. on the friction washer 20, which has a friction surface for generating friction torque, the number of processing steps for the positioning function can be reduced. There is no concern that distortion or the like will occur on the friction surface due to hole machining or the like.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a clutch disk to which the present invention is applied, Fig. 2 is an upper half view of the clutch plate in Fig. 1 in the direction of the arrow, Fig. 3 is a partial longitudinal sectional view of another embodiment, and Fig. 4. is a partial vertical cross-sectional view of a conventional example. 1...Spline hub, 5...Clutch plate (an example of side plate), 15...Button,
20...Friction washer, 36...Positioning protrusion.

Claims (1)

[Scope of utility model registration request] A resin bushing is rotatably fitted to the outer circumferential surface of the spline hub, a side plate is fitted to the outer circumferential surface of the bushing, and a friction washer is fitted to the outer circumferential surface of the bushing with an annular gap therebetween. positioning protrusions are cut and raised in the axial direction at multiple locations on the side plate that presses against the side surface of the friction washer, and the positioning protrusions are cut and raised in the axial direction to restrict the radial displacement of the friction washer. A clutch disk characterized in that it is opposed to the outer peripheral edge of a washer.