JPH038997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive shock shock absorber for a vehicle such as a motorcycle, which is smaller in size, lighter in weight, and lower in cost by reducing the number of parts.

In motorcycles, there is a type of drive type commonly known as a shaft drive, in which the engine and wheels are connected and driven by a propeller shaft. In this type of motorcycle, a shock absorber consisting of a pair of cams and a spring is connected to the output shaft end of the engine case to dampen torque fluctuations caused by rapid scanning, thereby ensuring operational stability. However, when a shock absorber is built into the engine case, the engine case becomes larger, the distance between the front and rear wheels of the vehicle increases, the overall size increases, the weight increases, and vehicle performance deteriorates.

In view of these points, this invention utilizes the connecting part between the propeller shaft end and the yoke flange of the universal joint to reduce the size and weight with fewer parts and to reduce manufacturing costs. Embodiments of the present invention shown in the drawings will be described.

The rear wheel 1 is rotatably attached to the rear end of a swing arm 2 that swings and cushions.
As shown in FIGS. 1 to 3, a propeller shaft 3 is passed through one arm of the swing arm 2, and the front end of the propeller shaft 3 is connected to the output of the engine 5 through a universal joint 4. It is connected to the shaft 6. The rear end of the propeller shaft 3 is connected to the wheel 1 via a pair of bevel gears.
is connected to. Accordingly, in the present invention, a drive cam 8 is provided on the end face of one yoke flange 7 of the universal joint 4, as shown in FIG. Then, the end of the propeller shaft 3 is inserted into the core hole 9 of the yoke flange 7 shown in FIGS. 5 to 7, and is fixed with a settling ring 10 to be rotatably connected.
The propeller shaft 3 is provided with a spline 11, into which a passive cam cylinder 12 shown in FIG. 8 is slidably inserted. The passive cam cylinder 12 is fitted with a coiled spring 13 from the rear side so as to mesh with the drive cam 8.
It is pressed by the drive cam 8. These are the propeller shaft 3 which is the power transmission mechanism to the wheels 1.
a swing arm 2 that swings and cushions between the engine 5 and the wheel 1;
It is installed on the engine 5 side.

The effect will be explained.

If there is a sudden torque fluctuation such as sudden acceleration or deceleration due to sudden operation of the throttle valve of the engine 5, the passive cam cylinder 12 will retreat against the spring 13 with respect to the driving cam 8. to move in the direction of rotation and cushion the shock. The drive cam 8 is attached to one yoke flange 7 of the universal joint 4.
Also, since the end of the propeller shaft 3 is rotatably connected to the core hole 9 of the yoke flange 7, the drive cam 8 is connected to the yoke of the pair of cams that buffer the shock. Since the flange 7 also serves as a component, the number of parts can be reduced, the cost can be reduced, and the device can be made smaller and lighter.

As explained above, the present invention provides a drive cam on the end face of one yoke flange of a universal joint at the end of the propeller shaft that connects the engine and the wheels, and allows the propeller shaft end to freely rotate through the core hole of the yoke flange. The passive cam cylinder is connected to the drive cam and is slidably inserted into the spline of the propeller shaft, and the passive cam cylinder is pressed against the drive cam by a spring, so that the yoke flange of the universal joint and the propeller shaft By using the connecting portion of the yoke flange, the yoke flange can also serve as a driving cam, and a shock absorbing device can be provided for the shock, thereby absorbing the rotating shock. Furthermore, since the number of parts is small and the device can be made small and lightweight, it can be incorporated into the swing arm. Therefore,
The engine case can be made smaller, the distance between the axes can be shortened, and the weight of the vehicle can be significantly reduced, so it can be manufactured at low cost, and furthermore, the vehicle performance can be improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view, Fig. 2 is an enlarged vertical sectional view of the part indicated by arrow A in Fig. 1, Fig. 3 is a perspective view showing the state before assembly, and Fig. 4 is a plan view. The figure is a perspective view showing the relationship between the universal joint and the yoke flange, Figures 5 to 7 show the yoke flange, Figure 5 is a front view, Figure 6 is a side view,
The figure is a bottom view indicated by arrow B, and FIG. 8 is a perspective view of the passive cam cylinder. 1...Wheel, 3...Propeller shaft, 4...
Universal joint, 5...Engine, 7...
... Yoke flange, 8 ... Drive cam, 9 ... Core hole, 11 ... Spline, 12 ... Passive cam cylinder,
13...Spring.

Claims (1)

[Claims] 1. A drive cam is provided on the end face of one yoke flange of a universal joint at the end of a propeller shaft that connects the engine and wheels of a shaft-driven motorcycle, and the end of the propeller shaft is rotatably connected to the core hole of the yoke flange. , a vehicle characterized in that a passive cam cylinder slidably inserted into a spline of a propeller shaft is engaged with a driving cam, and the passive cam cylinder is assembled into a swing arm so as to be pressed against the driving cam by a spring. Drive shock shock absorber.