JPS5841385Y2 - clutch disc - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a clutch disc for a friction clutch for an automobile.

In general, various kinds of abnormal noises are generated in the drive system of an automobile due to torsional resonance of the drive system, bumpiness of the gears of the transmission or differential device, and the like.

As a countermeasure to prevent this, by selecting the material of the torsion spring attached to the clutch disc, the material of the friction material (thrust lining) between the clutch disc bub, disc plate, and sub-disc plate, and the pressing force of the material, the clutch It is known to adjust the hysteresis width of a disk.

According to the simulation calculation button and the results of simulation experiments, it has been found that setting the hysteresis width to an extremely small value is very effective in suppressing the above-mentioned abnormal noise.

However, with the current structure of the clutch disc, it is difficult to adjust the hysteresis width to a small value that is expected to be sufficiently effective in suppressing abnormal noise, and it is also difficult to maintain the hysteresis with stable accuracy. .

In view of these conventional problems, this invention aims to suppress abnormal noises in automobile drive systems through slight improvements.
The hysteresis width can be stepped up to be extremely small.
Moreover, it is an object of the present invention to provide a clutch disc that can maintain the hysteresis with stable accuracy.

Next, the configuration of this invention will be explained in detail according to an embodiment shown in the drawings.

1. In Fig. 1, which shows a cross section of the clutch disk, the clutch disk 1 has the following parts.
A flange 2 is integrally formed.

A disk plate 8 and a sub disk plate 9 are arranged on both sides of this flange 2.

These two disk plates 8, 9 are connected to each other by stopper pins 10 through respective notches 3 formed on the outer periphery of the flange 2 at regular intervals.

Further, a plurality of disc springs 11 are fixed to the outer periphery of the disc plate 8 in the circumferential direction thereof, and facings 12 are fixed to both sides of these disc springs 11.

A plurality of torsion springs 5 are installed along the circumferential direction between the flange 2 and both disc plates 8 and 9.
, 9 is provided to perform a well-known damper function during torque transmission between the two.

Now, an annular friction material 4 is interposed between each of the above-mentioned flange 2 and both disk plates 8.9.

As is clear from the second rotation and FIG. 3, each of these friction materials 4 is divided into two elements 4a with respect to the thrust direction of the clutch disk (left-right direction in the drawing).

An elastic body 6 made of a material such as rubber is interposed between each of the divided elements 4a.

First, each friction material 4 has a structure in which an elastic body 6 is sandwiched between each element 4a, and each element 4a is pressed against the flange 2 based on the elastic force of this elastic body 6 and is pressed against both disk plates 8°9.

By adhering the elastic body 6 and each element 4a, each friction material 4 can be handled as a single component.

Furthermore, as is clear from FIG. 3, on both friction members 4, the surface facing the flange 2 and both disk plates 8, 9, that is, the surface of each element 4a, has a ridge along its circumferential direction. A plurality of grooves 7 are formed at regular intervals.

These grooves 7 form a plurality of independent frictional contact surfaces 13 on the surface of each element 4a.

Only these frictional contact surfaces 13 contact the flange 2 and both disk plates 8, 9.

The friction contact surface 13 facing each friction material 4 has a disk-shaped O projection T' on the surface of each element 4a, as shown in FIG.
It may also be constructed by forming a plurality of them.

Further, depending on the clutch disc, the friction material on either side may be omitted.

In the clutch disc configured as above, the clutch disc hub 1 and both disc plates 8, 9 are as follows:
During the mutual torque transmission, the notch 3 formed in the flange 2 on the hub 1 side and the stopper pin 10
The torsion spring 5 performs its damper function and causes relative angular displacement within the range of the distance between the torsion spring 5 and the torsion spring 5 in the circumferential direction.

This angular displacement causes the flange 2 and both disc brakes) 8
．． 9, friction occurs through each of the friction materials 4,
This frictional force becomes the hysteresis of the clutch disc.

In this embodiment, the contact surfaces 13 of each friction material 4 with respect to the flange 2 and both disk plates 8 and 9 are made into a plurality of independent surfaces as described above, so that the hysteresis width based on the frictional force is is an extremely small value.

FIG. 5 shows a graph of the results obtained in a simulation experiment regarding the relationship between this hysteresis and abnormal noise.

In the graph of FIG. 5, the vertical axis represents the sound pressure level, and the horizontal axis represents the frequency. The solid line represents the case of hysteresis due to the current clutch disk, and the dotted line represents the case of extremely small hysteresis.

As can be seen from this graph, the sound pressure level can be kept low by reducing the hysteresis.

Further, in this embodiment, each of the friction materials 4 is divided into two elements 4a, and an elastic body 6 is interposed between these elements, and the elastic force of the elastic body 6 is used to tighten the flange. By obtaining the contact force of the friction material 4 with respect to the two buttons and both disc plates 8 and 9, it becomes easy to set the required friction force, that is, hysteresis.

Moreover, by interposing the elastic body 6 described above, stable hysteresis can be obtained.

Note that the above hysteresis depends on the material of the friction material 4, the number of its friction contact surfaces 13 (total contact area), or the elastic body 6.
It can be adjusted by selecting the spring constant, etc.

As shown in Figure L, this idea slightly improves the structure of the friction material to set the hysteresis width of the clutch disc to an extremely small value that is effective in suppressing abnormal noise in the drive system, and to a stable precision. This has the advantage of easily meeting the hysteresis required for suppressing abnormal noise.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a sectional view of a part of the clutch disc, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 is a friction Fig. 4 is a perspective view showing a friction material with a different shape in the same state as Fig. 3; Fig. 5 shows the relationship between clutch disc hysteresis and abnormal noise in the drive system. This is a graph showing. 1...Clutch disc hub, 2...Flange, 4
...Friction material, 6.Elastic body, 8.Disc plate, 9.Sub disc plate, 13.Friction contact surface.

Claims (1)

[Scope of utility model registration request] A clutch disc configured to provide hysteresis by interposing an annular friction material between a flange of a clutch disc bub and at least one of a disc plate button and a sub-disc plate, wherein the friction The material is divided into two parts in the thrust direction of the clutch disc, an elastic body is interposed between these parts, and a plurality of partially independent frictional contacts are formed on the opposing surface of each friction material with the flange and plate. A clutch disc characterized by forming a surface.