JPH0670443B2 - Clutch disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a clutch disk suitable for application to a clutch device of an automobile.

[Conventional technology]

In automobiles, etc., vibration of the drive system caused by engine torque fluctuations induces vibration in the entire vehicle, and this vibration has a large transient change in engine torque, such as during sudden acceleration / deceleration, and its level is low. If it is too high, it will cause passenger discomfort.

Therefore, the present inventor is continuing research on measures to prevent this type of vehicle vibration, particularly drive system vibration, and one of them is to absorb this vibration by changing the torsional rigidity of the racch disc. We are considering a configuration that suppresses the transmission of vibrations to the.

[Problems to be solved by the invention]

However, according to a detailed study by the present inventor, the initial purpose cannot be achieved by merely changing the torsional rigidity of the clutch disc. For this purpose, the torsional rigidity is set to the characteristics as described below. It turned out to be necessary. That is, among the ones in which the torsional rigidity of the racch disc changes stepwise or non-linearly, the one having the characteristic that the rigidity increases from the middle has less vibration damping effect than the one having the linear characteristic, and conversely the rigidity is in the middle With the characteristic of decreasing from, the amount of transmission of vibration decreases and the effect of vibration isolation is great.

However, a clutch disc having such a torsional rigidity has not yet been obtained, and it is difficult to suppress vibration.

[Means for solving problems]

According to the present invention, an output member having a plurality of output arms protruding radially outward from a boss portion and an input arm arranged between the output arms in a circumferential direction are directed radially inward. A projecting input member is provided, and an elastic body in a desired compressed state is housed between the output arm and the input arm, and the output member and the input member are rotatably coupled to each other. The body has a large diameter spring having a free length that loses the spring force before the output member and the input member reach the maximum relative rotation angle, and the spring force even when the output member and the input member reach the maximum relative rotation angle. A small-diameter spring having a free length that does not lose power is concentrically arranged, and has a characteristic that the torsional rigidity decreases from the middle.

[Action]

When the output member and the input member relatively rotate more than a predetermined amount, one of the pair of elastic bodies housed between the output arm and the input arm reaches the free length, and the initial load given by the initial deflection. Becomes zero. As a result, the total spring constant obtained when both of these elastic bodies act as springs becomes larger than the spring constant when only one of them acts as a spring, and the torsional rigidity decreases from the middle. Shows to improve the anti-vibration effect.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a clutch disc of the present invention, and FIG. 2 shows a cross section taken along line II-II in FIG. In the figure, reference numeral 1 denotes a hub as an output member, and a spline 3 for connecting to an output shaft (not shown) is formed on the inner circumference of a boss portion 2 thereof. Further, a plurality of hub arms 4 as output arms are provided so as to project outward from the boss portion 2 of the hub 1 in the radial direction, and these hub arms 4 are equally arranged in the circumferential direction. As can be seen from FIG. 1, these hub arms 4 are formed in a fan shape here, and projections 5 for positioning a compression spring, which will be described later, are provided at both ends thereof.

On the other hand, 6 is a drive plate as an input member, the input arm 7 of which is equal in number to the number of the hub arms 4 is provided on the inner periphery of the drive plate so as to project outward in the radial direction, and each of the input arms 7 is connected to the hub arm 4. Are arranged between the adjacent circumferential directions. Here, the input arm 7 is integrally formed with an annular back plate 8 so as to connect the outer base ends thereof, and the back plate 8 is press-fitted and fixed to the inner periphery of the drive plate 6. In this case, the drive plate 6 may be directly attached, or both may be integrally formed. The drive plates 6 are connected to each other by rivets 9 so as to face each other, and a friction plate 10 is attached to the outer periphery of the drive plate 6. The friction plate 10 is sandwiched between a flywheel (not shown) and a pressure plate.

An elastic body 11 directed in the circumferential direction is housed between the hub arm 4 and the input arm 7 in a compressed state by a desired amount to connect the hub 1 and the drive plate 6 so as to be relatively rotatable. is there. In this embodiment, the elastic body 11 is composed of inner and outer double nested coil springs, and the compression force (initial deflection amount) when the large-diameter spring 11a that bears the main spring force is mounted is the hub 1 and the drive. This corresponds to the rotation angle at the time when the torsional rigidity changes when the plate 6 is relatively rotated. That is,
The pair of large-diameter springs 11a housed between the adjacent hub arms 4 with the input arm 7 interposed therebetween releases the initial bending load before the relative rotation between the hub arm 4 and the input arm 7 reaches the maximum rotation angle. Have a free length to lose the spring force.

The free length of the small diameter spring 11b is set so that the spring force is not lost even when the relative rotation angle is maximized.
The elastic body 11 is held in its housed position in cooperation with.

Further, 12 is a friction plate that gives a friction damping force to the relative rotation between the hub 1 and the drive plate 6, and this friction plate 12 is formed in an annular shape on the side surface of the hub 1 in order to prevent the clutch disc from increasing in the axial direction. It is housed in the groove 13. One friction plate 12
Between the drive plate 6 and the drive plate 6
A disc spring 15 is arranged via a retainer plate 14 which is engaged with the friction plate 13 so as not to be rotatable relative to each other, and a pressing spring force in the axial direction is applied to these friction plates 13.

According to the clutch disc having this configuration, the friction plate 10 is pinched between the flywheel (not shown) and the pressure plate, so that the driving torque of the engine is input from the drive plate 6 to which the friction plate 10 is fixed and elastic The hub 1 receives the vibration absorption / friction damping action by the body 11 and the friction plate 12.
Is output to.

At this time, the clutch disc exhibits a twisting characteristic as shown in FIG. That is, at the intermediate position of relative rotation shown in FIG. 1, the elastic body accommodated between the hub arm 4 and the input arm 7 in a compressed state by a desired amount (θ ₁ or θ ₂ ).
The spring force of 11 counterbalances the adjacent hub arms 4 with the input arm 7 interposed therebetween, and no torsion torque is generated.

Next, the hub 1 and the drive plate 6 are shown in FIG. 3 (a).
When the drive plate 6 is rotated leftward relative to the hub 1, the elastic body 11 located on the left side of the input arm 7 is compressed to generate an initial load corresponding to the generation of the torsion torque T _1. Spring force from the input arm 7
The elastic body 11 located on the right side of is gradually released from the initial deflection,
The spring force will gradually decrease from the initial load corresponding to the torsional torque −T _1, and the spring forces of both will be combined to show the torsional characteristic indicated by the line segment OA ₁ . When the movable body is further moved to the left and relatively rotated to the maximum relative angle as shown in FIG. 3 (b), the space between the input arm 7 and the hub arm 4 on the right side reaches a predetermined length. The elastic body 11 located loses its spring force by exhausting the initial deflection amount (θ ₂ ) and reaching the free length. Therefore, after that, only the elastic body 11 located on the left side of the input arm 7 functions, and the torsion characteristic becomes the characteristic indicated by the line segment A ₁ B ₁ .

Accordingly, the torsional rigidity of the line OA ₁ B ₁ of FIG. 4 (or OA ₂
As shown by B ₂ ), the rigidity decreases during the relative rotation, and an excellent vibration damping effect can be exhibited.

Here, when the relative rotation direction of the input member and the output member is one direction, it is sufficient to set one free length of the pair of elastic bodies to the above-mentioned length, and rotation in both directions can be considered. In this case, the free length of both elastic bodies may be set to the above length.

Further, in the above-mentioned embodiments, the present invention is applied to the clutch disc of the automobile clutch device, but the present invention can also be applied to the clutch devices used in various vehicles and machines that require measures against vibration. Further, a mechanism in which the driving force is transmitted between the input member and the output member in opposite directions can be similarly applied.

〔The invention's effect〕

As described in detail above, according to the present invention, the output member and the input member are relatively mounted by accommodating the elastic body in a desired compressed state between the output arm of the output member and the input arm of the input member. Since they are rotatably connected, it is possible to obtain the characteristic that the torsional rigidity is lowered from the middle, so that the vehicle vibration generated by the drive system coupling the suspension and the like can be effectively absorbed and damped. Further, the elastic member is a large-diameter spring having a free length that loses the spring force before the output member and the input member reach the relative maximum rotation angle, and the output member and the input member reach the relative maximum rotation angle. Even if the large diameter spring reaches the free length and loses the spring force, the small diameter spring inputs by its own spring force. Since it is held between the member and the output member, this also has the effect of being able to hold the housing position of the large diameter spring.

[Brief description of drawings]

1 is a front view of an embodiment of the present invention, and FIG. 2 is a front view of FIG.
II is a cross-sectional view taken along the line II, FIGS. 3A and 3B are enlarged views of essential parts for explaining the operating state, and FIG. 4 is a torsion characteristic diagram. 1 ... Hub (output member), 2 ... Boss part, 3 ... Spline, 4 ... Hub arm (output arm), 5 ... Protrusion,
6 ... Drive plate (input member), 7 ... input arm, 8 ... back plate, 9 ... rivet, 10 ... friction plate, 11 ... elastic body, 11a ... large diameter spring, 11b ... small diameter Spring, 12 ... Friction plate, 13 ... Annular groove, 14 ... Retainer plate, 15 ... Disc spring.

Claims (1)

[Claims] 1. An output member having a plurality of output arms projecting radially outward from a boss portion, and an input arm arranged between the output arms in a circumferential direction directed radially inward. And an input member projecting from the input arm, and an elastic body compressed in a desired amount is housed between each of the output arm and the input arm, and the output member and the input member are connected so as to be relatively rotatable. In the clutch disc, the elastic body has a large diameter spring having a free length that loses a spring force before the output member and the input member reach the relative maximum rotation angle, and the output member and the input member have the maximum relative rotation angle. A clutch disc, which is concentrically arranged with a small-diameter spring having a free length that does not lose the spring force even when it reaches a certain point.