JPH0640338Y2 - Clutch disc - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a clutch disk applied to a power transmission device or the like of an automobile.

2. Description of the Related Art The clutch disk is for effectively absorbing and damping torsional vibration generated from an engine or the like to prevent undesired vibration or noise from being generated in the power transmission system.

Recently, this clutch disk is required to have improved performance of absorbing torsional vibration due to torque fluctuation at low torque such as engine idling operation.
As disclosed in Japanese Laid-Open Patent Application No. 159430 and Japanese Utility Model Laid-Open No. 59-164832, an outer hub is provided on an outer peripheral portion of an inner hub having a fitting portion for an output shaft so as to be relatively rotatable within a predetermined angle. And an elastic member (having a small spring constant) for elastically rotating the hubs relative to each other and a bearing for smoothing the relative rotation between the hubs. It has been proposed to provide a hub split type output member as described above, in which an elastic member causes a vibration absorbing action with respect to fluctuating torque in a low torque region, thereby preventing torsional vibration.

DISCLOSURE OF THE INVENTION However, in the above-mentioned conventional example, a sufficiently satisfactory performance has not yet been obtained, especially in an extremely low torque region such as when the engine is idling. According to a study for further improvement of performance by the inventor, this is because the conventional clutch disk causes relative rotation between two hubs connected by an elastic member when absorbing torque fluctuation in a low torque range. It seems that no consideration is given to damping, and by giving a little stable damping force resistance to the relative rotation between the hubs, including elimination of neutral noise during idling. Have found that more effective prevention of torsional vibration can be achieved.

Therefore, in order to further improve the performance of the above-described conventional example, the present invention provides an outer hub in which the outer hub of the inner hub having a fitting portion for the output shaft can be relatively rotated by a predetermined angle. And the drive plate is attached to the inner hub and the outer hub so that they can be relatively rotated by a predetermined angle.
While the inner hub and the outer hub are connected by a rubber-like elastic member having a low rigidity, the drive plate and the outer hub are connected by a spring member having a high rigidity, and a frictional force is generated between the drive plate and the outer hub. In the clutch disc formed by interposing means, a cylindrical portion is extended to the side of the outer hub, and the rubber-like elastic member is fixed to the inner circumference of the cylindrical portion to secure the inner circumference of the rubber-like elastic member. It is characterized in that it is press-fitted and fixed to the outer periphery of the inner hub, and the frictional force generating means is arranged at a position on the outer peripheral side of the cylindrical portion and substantially within the axial width of the cylindrical portion.

Action When a relative rotation occurs between the inner hub and the outer hub during transmission of the driving torque, the rubber-like elastic member that connects the inner hub and the outer hub is flexibly deformed, and fluctuation torque and fluctuation torque in the low torque range It absorbs and damps the torsional vibration caused by.

Embodiment In the sectional view of FIG. 1 and in the partially cutaway front view of FIG. 2, each is a clutch disk 1 according to an embodiment of the present invention.

This clutch disk 1 is capable of elastic relative rotation within a predetermined angle with respect to the output member 2 of the hub-divided output member 2 and the output member 2 in a state where the output member 2 is substantially wrapped around the output member 2. A pair of drive plates 3a, 3b provided and friction plates 4a, 4b fixed to the outer peripheral portions of these drive plates 3a, 3b.
It consists of and.

Then, the respective constituent parts will be described in more detail as follows.

The output member 2 is composed of an inner hub 2a that is spline-coupled to an output shaft (not shown), and an outer hub 2b that is fitted onto the outer peripheral portion of the inner hub 2a so as to be relatively rotatable within a predetermined angle. Has been done. And this inner hub
The outer peripheral portion of the outer hub 2b is vulcanized and adhered to the cylindrical portion 6 of the sub plate 5 fixed to both sides of the outer hub 2b, and the inner portion of the cylindrical member 7 is press-fitted and fixed to the outer peripheral portion of the inner hub 2a. The peripheral portion is elastically connected by a rubber-like elastic member 8 having a substantially disc shape and vulcanized and adhered. Therefore, the inner hub 2a has a plurality of notches 9 formed in the outer periphery thereof.
And a projection 10 formed on the inner circumference of the outer hub 2b and formed in engagement with the groove 9 in the forward direction, θ _a (arbitrary) in the forward direction and θ _b (arbitrary) in the reverse direction. The elastic relative rotation of the angle is possible.

On the other hand, on the outer circumference of the outer hub 2b, three hub arms 11 extending in the radial direction are formed at equal intervals in the circumferential direction, and the coil springs 14 and 15 are provided between the adjacent hub arms 11 via the arm 13 of the idler 12. Are arranged in series. Outer hub 2
On the drive plates 3a, 3b arranged substantially on the outer peripheral side of b and arranged on both sides thereof, a window 16 having the same circumferential length as the circumferential length between the adjacent hub arms 11 of the outer hub 2b is provided. The end faces of the windows 16 in the circumferential direction are formed by the coil springs 14 and 15 housed between the adjacent hub arms 11.
Is engaged with. Therefore, when the outer hub 2b and the drive plates 3a, 3b rotate relative to each other, the coil springs 14, 15 housed between the adjacent hub arms 11 act in series, and the spring groups acting in series act in parallel. To work.

Friction resistance between the outer hub 2b and the drive plates 3a, 3b, more specifically, between the sub plates 5, 5 integrally attached to the outer hub 2b and the drive plates 3a, 3b, when these are relatively rotated. Friction members 17, 17 as a frictional force generating means for applying are attached. Reference numeral 18 is a disc spring, and the disc spring 18 is provided between the retainer plate 19 disposed adjacent to the friction member 17 and the drive plate 3a, and gives the friction members 17, 17 a stable axial pushing force. Reference numeral 20 is a bearing member that is arranged between the inner peripheral end of the drive plate 3a and the inner hub 2a to facilitate relative rotation of both members.

Incidentally, the hysteresis torque due to the internal friction of the rubber-like elastic member 8 connecting the inner hub 2a and the outer hub 2b and the spring constant are comparatively small, and it is effective in absorbing and damping the torsional vibration due to the torque fluctuation at low torque, The output member 2
The spring constants of the coil springs 14 and 15 and the friction coefficients of the friction members 17 and 17 mounted between the drive plate 3a and the drive plate 3a and 3b are relatively large and effective for absorbing and damping torsional vibration due to torque fluctuation at large torque. .

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

The clutch disk 1 is incorporated in the clutch device, and the friction plates 4a, 4b are pressed against the flange wheel of the engine (not shown), so that the drive torque of the engine causes the drive plates 3a, 3b to drive the coil springs 14, 15 into the coil springs 14, 15. It is transmitted to the output member 2 via the output member and output to the output shaft (not shown).

At this time, the driving torque is that the inner hub 2a and the outer hub 2b of the output member 2 are bent from the outer hub 2b while bending the rubber-like elastic member 8 having a relatively small spring force within a range in which the inner hub 2a and the outer hub 2b can relatively rotate. The fluctuating driving torque in the low torque range is transmitted to the rubber-like elastic member 8 and is absorbed by the rubber-like elastic member 8, and the torsional vibration caused by the fluctuating driving torque is attenuated by the rubber-like elastic member 8.

Next, the groove 9 of the inner hub 2a and the protrusion 10 of the outer hub 2b.
After the side walls of the inner hub 2a and the outer hub 2b are engaged with each other and the relative rotation of the inner hub 2a and the outer hub 2b is stopped, the driving torque input from the drive plates 3a and 3b is changed by the coil springs 14 and 15. Due to the vibration absorbing action, the friction member 17,
It is output to an output shaft (not shown) via the inner hub 2a while receiving the damping action of 17. In this case, the coil springs 14 and 15 are formed by the hub arms 11 adjacent to the outer hub 2b.
Since they are configured as a group of springs that act in series between them, the relative rotatable angle between the drive plates 3a, 3b engaging with these coil springs 14, 15 and the output member 2 is large,
Exhibits excellent vibration damping capability over a wide range of transmission torque.

According to the present embodiment, the rubber-like elastic member 8 can absorb and damp the fluctuating torque in the low torque region and the torsional vibration caused by the fluctuating torque. Therefore, for example, the spring member and the friction plate are used. And are installed between the inner hub 2a and the outer hub 2b to exhibit vibration absorption and damping,
The number of constituent parts can be reduced and the product price can be reduced.

Further, according to the present embodiment, the frictional force generating means (the friction member 17) is located at the outer peripheral side of the cylindrical portion 6 having the rubber-like elastic member 8 adhered to the inner periphery thereof and substantially within the axial width of the cylindrical portion 6. ) Are arranged, the width dimension (axial dimension) of the clutch disc 1 can be reduced, and the inner peripheral side of the rubber-like elastic member 8 fixed to the inner peripheral surface of the cylindrical portion 6 is interposed via the cylindrical member 7. Since the inner hub 2a is press-fitted and fixed to the outer periphery of the inner hub 2a, special processing such as drilling on the inner hub 2a side for assembling the rubber-like elastic member 8 is not necessary, and the assembling work of the rubber-like elastic member 8 is not required. It also becomes easier.

As described above, according to the present invention, the outer hub is externally fitted to the outer peripheral portion of the inner hub having the fitting portion for the output shaft so as to be relatively rotatable by a predetermined angle, and the inner hub and the outer hub are fitted together. The drive plate is assembled so that it can be relatively rotated by a predetermined angle, and the inner hub and the outer hub are connected by a low-rigidity rubber elastic member, while the drive plate and the outer hub are connected by a high-rigidity spring member. In the clutch disc in which the frictional force generating means is interposed between the drive plate and the outer hub, the cylindrical portion is extended to the side of the outer hub, and the rubber-like member is formed on the inner circumference of the cylindrical portion. An elastic member is fixed, the inner circumference of the rubber-like elastic member is press-fitted and fixed to the outer circumference of the inner hub, and the frictional force generating means is provided on the outer circumference side of the cylindrical portion. Since it is arranged at a position substantially within the axial width of the cylindrical portion, it is not necessary to separately secure a space for arranging the frictional force generating means in the width direction of the clutch disc, and as a result, the width of the clutch disc is reduced. It is possible to obtain the vibration damping effect in the high torque range by the high-rigidity spring member and the frictional force generating means and the vibration damping effect in the low torque range by the low-rigidity rubber-like elastic member without expanding. Also,
By fixing the rubber-like elastic member to the inner circumference of the cylindrical part and press-fitting and fixing the inner circumference of this rubber-like elastic member to the outer circumference of the inner hub, special processing on the inner hub side for assembling the rubber-like elastic member can be performed. In addition to being unnecessary, the work of assembling the rubber-like elastic member itself is facilitated, and as a result, it is possible to reduce the manufacturing cost, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view (cross-sectional view taken along the line I--I of FIG. 2) of a clutch disk showing an embodiment of the present invention, and FIG. 2 is a front view thereof. 1 ... Clutch disk, 2a ... Inner hub, 2b ... Outer hub, 8 ... Rubber-like elastic member.

Claims (1)

[Scope of utility model registration request] 1. An outer hub is externally fitted to an outer peripheral portion of an inner hub having a fitting portion for an output shaft so as to be relatively rotatable by a predetermined angle, and the inner hub and the outer hub are relatively rotatable by a predetermined angle. The drive plate is assembled in such a state that the inner hub and the outer hub are connected by a low-rigidity rubber-like elastic member, while the drive plate and the outer hub are connected by a high-rigidity spring member, and the drive plate and the outer hub are connected. In a clutch disc having frictional force generating means interposed between the hub and the hub, a cylindrical portion is extended to the side of the outer hub, and the rubber-like elastic member is fixed to the inner circumference of the cylindrical portion. The inner periphery of the rubber-like elastic member is press-fitted and fixed to the outer periphery of the inner hub, and the frictional force generating means is provided on the outer peripheral side of the cylindrical portion and substantially within the axial width of the cylindrical portion. Clutch disc, characterized in that arranged at a position.