JPS6242876Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheel damper device mainly used for a rear wheel of a two-wheeled motor vehicle.

Conventionally, as shown in FIG. 1, a device of this type has a driven retainer b provided on a wheel a facing forward in the rotational direction of a drive retainer c provided on a drive flange connected to the engine, and a space between the two retainers b and c is provided. It is known that a damper rubber d is interposed as a damper member, and the elastic deformation of the rubber d buffers and absorbs torque fluctuations, but in this case, it is possible to cope with large torque fluctuations that occur during gear changes, sudden acceleration, etc. In order to do this, it is necessary to set the spring constant of the rubber d to be large, and according to this, in the low torque range where the engine torque is small, that is, in the torque range generated by the engine during normal driving, the spring constant of the rubber d needs to be large.
This results in the inconvenience that the torsional rigidity between the drive flange and the drive flange becomes too high, making it impossible to sufficiently absorb torque fluctuations associated with engine rotational fluctuations that tend to occur in the low torque range.

Further, from the viewpoint of durability, it is impossible to make the rubber d have a small spring constant that can absorb torque fluctuations in the low torque range.

In view of the above problems, the present invention uses a damper rubber and a coil spring together as a damper member,
The purpose is to provide a compact device in which the spring can absorb torque fluctuations in the low torque range, and the driven retainer 2 provided on the wheel 1 is connected to the driven retainer 2 provided on the drive flange 4 on the engine 3 side. A damping lever 6 is disposed between the retainers 2 and 5, facing forward in the rotational direction of the retainer 5.
In the wheel damper device, the damper rubber 6 is provided with play in the rotational direction between both the retainers 2 and 5, and a through hole 8 in the rotational direction is provided in the rubber 6. The present invention is characterized in that a coil spring 9, which is elongated in the rotational direction and extends into the play 7, is compressed between the retainers 2 and 5.

The wheel 1 is, for example, a rear wheel of a motorcycle shown in FIG. 2, and the drive flange 4 is a chain block connected to an engine 3 mounted on the motorcycle via a chain 10. 11, and the wheel 1
As clearly shown in FIGS. 3 and 4, there is a recess 1 protruding from the flange 4 into which the drive retainer 5 is inserted.
2, and the front end wall of the recess 12 in the rotational direction (counterclockwise in FIG. 3) is configured as the driven retainer 2, and is located within the recess 12 in the gap between both the retainers 2 and 5. Then, the rubber 6 was fitted with the play 7. In the illustrated embodiment, the play 7 is formed on the driving retainer 5 side of the rubber 6, but it is of course possible to form the play 7 on the driven retainer 2 side.

The spring 9 is inserted through a through hole 8 formed in the rubber 6 and extending in the direction of rotation, and between the supports 13, 13 provided in the retainers 2, 5 without any play.

In the drawings, reference numeral 14 indicates a reaction rubber interposed between the drive retainer 5 and the rear end surface of the recess 12 in the rotational direction, and functions to absorb torque fluctuations during deceleration.

Next, to explain the operation of the device of the present invention constructed as described above, the wheel 1 of the drive flange 4
The torsion angle in the forward direction of rotation increases as the transmitted torque increases, and in this case, only the coil spring 9 is compressed until the torsion angle reaches an angle α corresponding to the play 7, and exceeds the angle α. Both the spring 9 and the damping lever 6 are compressed, and the torsional rigidity is changed in two stages, as shown in FIG.

Therefore, torque fluctuations due to rotational fluctuations of the engine 3 in the low torque range are effectively absorbed in the range with low torsional rigidity, and large torque fluctuations that occur during gear shifting or sudden acceleration are effectively absorbed in the high rigidity range. be done.

In addition, as in this embodiment, the power transmission system includes a chain 10.
When using this type of suspension, if the torsional rigidity of the coil spring 9 is set lower than the vibration rigidity of the chain 10, resonance of the chain 10 caused by torque fluctuations of the engine 3 can be prevented, thereby preventing unpleasant chain vibrations.

In this way, according to the present invention, the driven retainer 2
The damper rubber 6 interposed between the retainer 2 and the drive retainer 5 is provided with play in the rotational direction between both the retainers 2 and 5, and a through hole 8 in the rotational direction is provided in the rubber 6. Since the coil spring 9 is located between the retainers 2 and 5 and is long in the rotational direction and extends within the play 7, fluctuations in the transmitted torque between the retainers 2 and 5 are limited to the low torque range. In the high torque range, the coil spring 9 can effectively absorb the torque by using both the coil spring 9 and the damper lever 6, and since the coil spring 9 is installed in the through hole 8 of the rubber 6, a separate installation space is required. It has the advantage that the arrangement can be made easier and the device can be made more compact.

[Brief explanation of the drawing]

Figure 1 is a cut-away side view of a conventional device, Figure 2 is a side view of a motorcycle on which the proposed device is installed, Figure 3 is a cut-away side view of its main parts, and Figure 4 is the same as Figure 3. −
FIG. 5, a cutaway cross-sectional view, is a line diagram showing the characteristics of the present device. 1... Wheel, 2... Driven retainer, 3...
Engine, 4... Drive flange, 5... Drive retainer, 6... Damper lever, 7... Play, 8...
...Through hole, 9...Coil spring.

Claims (1)

[Scope of utility model registration request] In the wheel damper device, the driven retainer 2 provided on the wheel 1 is opposed to the drive retainer 5 provided on the drive flange 4 on the engine 3 side in the rotational direction forward, and the damper rubber 6 is interposed between the both retainers 2 and 5. A damping lever 6 is provided with play in the rotational direction between the two retainers 2 and 5, and a through hole 8 in the rotational direction is provided in the rubber 6, and a through hole 8 is provided in the through hole 8 between the two retainers 2 and 5. A wheel damper device characterized in that a coil spring 9 extending in the play 7 and extending in the direction of rotation is compressed.