JPS62184229A - Clutch disc - Google Patents

Abstract

PURPOSE:To improve vibration absorbing performance at the time of low torque by connecting an inner hub and an outer hub by an elastic member, and interposing a friction member for giving frictional resistance to the relative turning movement of the hubs between the inner and outer hubs. CONSTITUTION:An outer hub 22 is fitted to the outer peripheral portion of an inner hub 21 spline-connected to an output shaft in such a manner as to relatively turn within a designated angle. An elastic member 23 for giving the relative turning movement returning force between both hubs and a low- friction member 26 for facilitating the relative turning movement between both hubs are disposed between both hubs 21, 22. Further, there is provided a friction member 27 for giving frictional resistance to the relative turning movement between both hubs. In this arrangement, at the time of transmitting driving torque, fluctuating torque in low torque range can be damped effectively to prevent torsional vibration and noise caused by the torsional vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clutch disc used in a power transmission device of an automobile or the like.

(Prior Art) Clutch discs are used to effectively absorb and damp torsional vibrations generated from engines, etc., to prevent undesirable vibrations or noise from occurring in the power transmission system.

Recently, there has been a demand for this clutch disc to have improved performance in absorbing torsional vibrations caused by torque fluctuations during low-torque operation such as when the engine is idling.
Publication No. 9-159430 and Utility Model Application Publication No. 1983-16483
As shown in Publication No. 2, etc., an outer hub is fitted onto the outer periphery of an inner hub that has a fitting portion to an output shaft in a state that allows relative rotation within a predetermined angle. and a hub division comprising an elastic member (having a small spring constant) that elastically allows the hubs to rotate relative to each other and a bearing that smooths the relative rotation between the hubs. A device has been proposed that includes a mold output member and uses an elastic member to produce a vibration absorbing effect against fluctuating torque in a low torque range, thereby preventing torsional vibration.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional example, sufficiently satisfactory performance could not yet be obtained, particularly in an extremely low torque range such as when the engine is idling. According to the inventor's research to further improve performance, this is due to the fact that the conventional clutch disc reduces the relative rotation that occurs between two hubs connected by an elastic member when absorbing torque fluctuations in the low torque range. This seems to be because no consideration has been given to damping. By providing a slightly stable damping force resistance to the relative rotation between these hubs, it is possible to reduce torsional vibration, including eliminating neutral noise during idling. We have found that more effective prevention can be achieved.

(Means for Solving the Problems) In view of the above-mentioned actual situation, the present invention provides a clutch disc equipped with a hub-split type output member that is interconnected by an elastic member so as to be able to elastically rotate relative to each other. A friction member is interposed between the inner hub and the outer hub to provide frictional resistance to the relative rotation of these hubs.

(Function) When absorbing the vibration of fluctuating torque in the low torque range, the elastic member acts and a relative rotation occurs between the inner hub and the idling.
The friction member interposed between the two hubs provides frictional damping resistance to their relative rotation, and acts to quickly damp vibrations during vibration absorption.

(Example) What is shown in the sectional view in FIG. 1 and in the partially cutaway front view in FIG. 2 is a clutch disk l according to an example of the present invention.

This clutch disc I is capable of elastic relative rotation within a predetermined angle with respect to the output member 20 of the hub split type while substantially enveloping the outer circumferential side of the output member 20. tl is formed by a pair of provided drive plates 30.31 and a friction plate 40.40 fixed to the outer periphery of these drive plates 30.31.

A more detailed explanation of each component is as follows.

As partially shown in detail in FIG. 3, the output member 20 includes an inner hub 21 that is spline-coupled to an output shaft (not shown), and an elastic member (for example, C-shaped) that is externally fitted onto the inner hub 21. The outer hub 22 is coupled to the inner hub 21 via a spring 23 so as to be elastically rotatable relative to the inner hub 21 within a predetermined angle. In addition,
One end of the elastic member 23 is engaged with the inner hub 21, and the other end is engaged with the outer hub 22. In such a coupled state, the outer hub 22 is attached to the inner hub 21 by the outer protrusion 21a formed thereon.
Ill is elastic only between the angles limited by θa (arbitrary) in the positive direction and θb (arbitrary) in the opposite direction.
Anti-rotation is possible.

Furthermore, subplates 24 and 25 are attached to both sides of the inner circumferential end of the outer hub 22 so as to rotate together with the outer hub 22. A low-friction member (for example, a needle hair ring) 26 is interposed between the lower end of one of the sub-plates 24 and the outer circumferential portion of the inner hub 21. Rotation is smoothed. Furthermore, an annular plate-shaped friction member 27 is interposed between the sub-plate 24 and the inner hub 21. This friction member 27 provides a damping force due to frictional resistance to the relative rotation between the hubs 21 and 22. Furthermore, in this embodiment, the sub-plate 24
In order to make the frictional contact state of the friction member 27 with the inner hub 21 more stable, an annular wave plate-shaped elastic member 28 is attached to the inner side of the other sub-plate 25. A spring force is applied to the pinching force of the friction portion t127 between the sub-plate 24 and the inner hub 21 to obtain a stable friction force.

On the other hand, on the outer periphery of the outer hub 22, there are 3 extending in the radial direction.
Two hub arms 29 are formed and arranged at equal intervals in the circumferential direction, and coil springs 60 and 61 are arranged in series between adjacent hub arms 29 via arms 63 of floaters 62. A drive plate 30 , 31 that substantially surrounds the outer circumferential side of the outer hub 22 and is arranged on both sides thereof has a window having a circumferential length that is the same as the circumferential length between adjacent hub arms 29 of the outer hub 22 . 32 are formed, and the circumferential end surfaces of these windows 32 are engaged with coil springs 60, 61 housed between adjacent hub arms 29.

Therefore, the outer hub 22 and the drive plate 30.3
1, the coil springs 60, 61 housed between adjacent hub arms 29 act in series, and the spring groups acting in series act in parallel.

Between the outer hub 22 and the drive plate 30.31, specifically between the sub-plate 24.25 and the drive plate 30.31, which are integrally attached to the outer hub 22, there is a frictional resistance to their relative rotation. Friction members 34 and 35 are sandwiched to give the same. A disc spring 36 is located between the friction member 34 and the drive plate 30 and applies a stable axial pressing force to the friction members 34 and 35.

Note that the spring constant of the elastic member 23 attached between the inner hub 2I and the outer hub 22 and the friction member 27
The friction coefficient of the output member 2 is relatively small and is effective for absorbing and damping torsional vibration caused by torque fluctuations at low torque.
0 and the spring constant of the coil spring 60.61 attached to the side between the drive plate 30.31 and the friction member 34
．． The friction coefficient of 35 is relatively large and effective for absorbing and damping torsional vibrations caused by torque fluctuations when a large torque is applied.

Next, the operation of the embodiment configured as above will be explained.

When this clutch disk 1 is assembled into a clutch device and the friction plate 40.40 is pressed against the flywheel of the engine (not shown), the driving torque 7 of the engine is transferred from the drive plate 30.31 to the coil spring 60.6.
1 to the output member 20, and is output to an output shaft (not shown).

At this time, the driving torque is first transmitted from the outer hub 22 to the inner hub 21 while bending the elastic member 23 with a small spring force within a range in which the inner hub 21 and the outer hub 22 of the output member 20 can rotate relative to each other. The fluctuating torque in the low torque range is subjected to vibration absorption by the elastic member 23 and damped by the friction member 27. Here, a low friction member 26 is provided between the inner hub 21 and the outer hub 22 to smooth the relative rotation thereof, and an elastic member 2 is provided as the friction member 27 that applies a friction damping force to the relative rotation.
8 provides a stable pressing force, so the vibration absorption and damping ability obtained when the inner hub 21 and outer hub 22 rotate relative to each other becomes extremely stable.

Next, after the outer protrusion 21a of the inner hub 21 and the notch 22a of the outer hub 22 are engaged and their relative rotation is stopped, the inner hub 21 and the outer hub 22 become integral, and drive play) The driving torque inputted from 30.31 is subjected to a vibration absorption effect by coil springs 60.61, and is output to an output shaft (not shown) via inner hub 2I while being subjected to a damping effect by friction members 34.35. In this case, the coil spring 60°6
! are configured as a group of springs that act in series between the adjacent hub arms 21a of the outer hub 21, so the relative rotation angle between the drive plate 30, 31 that engages with these coil springs 60, 61 and the output member 20 is is large, and exhibits excellent vibration absorption and damping performance over a wide range of transmitted torque.

Figure 4 is a diagram showing the torsional characteristics of this crudging disc l that operates in this manner, with the torsional torque input on the vertical axis and the relative rotation angle between the input and output members on the horizontal axis. .

In the above embodiment, the friction member 34 was indirectly interposed between the inner hub 2I and the outer hub 22 via the sub-plate 24, but the friction member 34 was indirectly interposed between the inner hub 21 and the outer hub 22 without the intervening sub-plate 24. It may be interposed so as to be in direct contact with. Further, the low friction portion vI' 2
6 may be substituted because the sub-plate 24 and the inner hub 21 are coated with a low-friction material or plated with chromium, nickel, or the like. In addition, the inner hub 2
1 and the outer hub 22.
Although both ends of 3 were engaged with the inner hub 21 and the outer hub 22, respectively, they may be engaged with the inner hub 21 and the sub-plate 24, respectively.

(Effects of the Invention) According to the present invention, in a clutch disk including a hub split type output member formed by connecting an inner hub and an outer hub that are relatively rotatably fitted via a low friction member with an elastic member, Since a friction member is attached between the inner hub and the outer hub to provide frictional resistance to their relative rotation, it is possible to effectively attenuate fluctuating torque in the low torque range when transmitting drive torque. Thus, a clutch disk can be obtained which is highly effective in preventing torsional vibration and noise based thereon.

[Brief explanation of drawings]

1 and 2 are diagrams showing a clutch disk according to an embodiment of the present invention, and FIG. 1 is a graph showing the characteristics of FIG. 2. I...Clutch disc, 20...Split type output member, 21...Inner hub, 22...Outer hub,
23... Elastic member, 26... Low friction member, 27...
・Friction member. 2 people Figure 1 Figure 4

Claims (1)

[Claims] An outer hub is fitted onto the outer periphery of an inner hub that has a fitting portion to the output shaft in a state that allows relative rotation within a predetermined angle, and the relative rotation of both hubs is performed between the inner hub and the outer hub. In a clutch disc equipped with a hub-split type output member having an elastic member that provides a return force and a low-friction member that smoothes relative rotation between the two hubs, the A clutch disc characterized by having a friction member interposed therein that provides frictional resistance to rotation.