JPS602233B2 - Rear wheel suspension system for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear suspension system for a motorcycle equipped with a rocking rear oak.

In this type of device, the present applicant has proposed that the front end of the rear wheel support or Yahoo oak is pivotally supported on the vehicle body frame so as to be able to swing up and down, and the front end of the yahoo oak that is pivotally attached to the intermediate part of the rear wheel and the vehicle body frame. It has already been proposed that the rear end of a tension rod, which is pivotably supported on the vehicle body so as to be able to swing up and down, is pivotally connected to the link with a shock absorber interposed therebetween.

The above device can support the load applied to the rear wheel in a cushioning manner by using a single shock absorber placed near the front end of the rear oak, and can also absorb the load by selecting the intersection angle between the tension rod and the shock absorber. Various buffer properties are given to the container,
Since the load fluctuation of the rear wheels can be effectively buffered and absorbed by the shock absorber within the limited lifting stroke of the rear wheels, it is extremely effective in making the device more compact and improving riding comfort. be. The present invention provides, in the above-mentioned device, a link connected to the rear fork and a rear wheel drive transmission chain located on both upper and lower sides of the rear fork, so that grains are distributed on the same motion plane without interference with each other, The primary objective is to make the device more compact, and by extension, reduce the width of the vehicle in the lateral direction, and also to use the link to restrict the lowering limit of the transmission chain in a cushioning manner. ,
A second purpose is to suppress excessive vibration of the Cheso and improve its durability.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. Axis 2 immediately after
The front end of the rear fork F is supported so as to be vertically swingable, and the rear wheel W is supported on the rear end by a support 33.

As shown in FIG. 2, the 1' rough oak F has a pair of left and right legs 4, 4, which are connected to each other at the front end via a bearing tube 5 supported on the pivot shaft 2, and also at the middle part. The above four members 4 are connected via a cross member 6.
, 4, 5, and 6, a rear wheel suspension shock absorber ○ is disposed in the vertical direction.

The upper end, or fixed end, of this shock absorber D is pivoted to the vehicle body frame B via a pivot 7 so as to be able to swing back and forth, and the lower end, or movable end, is connected to a pivot 8 that connects the rear aircraft to the middle part of the rear truck F. The front end of the link 9 is connected via a pivot shaft 10, and the link 9 has a tension rod 12 whose front end is connected to the vehicle body frame B via a pivot shaft 11 so as to be pivotable up and down. The rear ends of the two are connected via a pivot 13. As shown in FIG. 1, the link 9 is bent into a bell crank shape at the pivot 11, and the long arm 9a is connected to the rear oak F by the pivot 8, and the first arm is connected to the shock absorber D by the pivot 10. The short arm 9b that is used is called the second arm.

As shown in FIG. 3, a pair of left and right first arms 9a are provided,
These are connected to each other by a cross member 9c on the axis of the pivot shaft 13, and a pair of left and right second arms 9b, 9b extend from the center of the cross member 9c so as to support the pivot shaft 7 on both sides.
stands out. A pair of left and right tension rods 12 are also provided, and these are attached to pivot shafts 13 at both ends of the cross member 9c.
, 13. Furthermore, each first arm gc of the link 9 has a pair of left and right arm plates 14 that protrude from the end of the cross member 9c and are opposed to each other across the same-sided oak leg body 4.
, 14, by which both ends of the pivot shaft 8 passing through the rear oak E are supported.

Therefore, the link 9 has a structure between the arm plates 14, 14,
A through hole C that opens in the longitudinal direction of the vehicle body is formed. A transmission chain 17 that interlocks the output sprocket 15 of the engine E and the drive sprocket 16 of the rear wheel W is connected to its lower portion 1.
Grain 7a is arranged so as to pass through the through hole C.

This transmission chain 17 vibrates up and down as the rear fork F swings, and in order to buffer the lower limit of the lower part 17a, a synthetic resin chain slider 18 is installed on the inner surface of the through hole C. That is, it is attached to the upper surface of the cross member 9c. As shown in FIG. 4, this chain slider 18 has a pair of front and rear locking claws 18a, 18a, which elastically hold the cross member 9c from the front and back, thereby attaching the chain slider 18. Next, to explain the operation of this embodiment, when an upward load is applied to the rear wheel W, the rear oak F swings upward using the Shofuji 2 as a fulcrum, the link 9 moves upward and the tension rod 12 pivots accordingly. 11 as a fulcrum, the shock absorber D is compressed and supports the above-mentioned load in a cushioning manner.

In this case, the refreshing angle q between the tension rod 12 and the buffer D
By setting the angle at an acute angle when the load is low and approaching a right angle as the load increases, the amount of compression of the shock absorber D can be increased at an accelerating rate as the upward swing of the rear fork F progresses. As a result, as shown in Fig. 5, the buffer D
shows a preferable cushioning characteristic on the ground of Qin'0, in which the amount of compression increases at an accelerating rate in accordance with the upward swinging of the rear oak F. As the shock absorber D is compressed, the first arm 9a of the link 9 receives a tensile force from the rear oak F, but since this first arm ga supports both ends of the cardinal 8 with the rear oak F in between, the above tensile force is is a simple tensile force, and no bending force acts on the first arm 9a. Moreover, since a pair of left and right first arms 9a are provided on both sides of the shock absorber D, the above-mentioned tensile force is distributed to the left and right, and the force burden of each first arm 9a is halved. Further, a tensile force is applied to the tension rod 12 from the link 9, but since there are also pairs of tension rods 12 on the left and right, and both extend in the direction of the above-mentioned tensile force, the tension rod 12
The force that 2 receives is also a single cotton tensile force, and that force is distributed to the left and right tension rods 12, 12.

As described above, according to the present invention, the front end of the rear oak F that supports the rear wheel W is supported on the vehicle body frame B so as to be able to swing vertically, and the front end of the rear oak F that supports the rear wheel W is pivotably attached to the middle part of the rear oak F.
A shock absorber D is interposed between the front end of the body frame B and the vehicle body frame B, and the vehicle body frame B has the rear end of a tession rod 12 pivotally supported to be vertically swingable and pivoted to the link 9, The link 8 has a through hole C that extends in the longitudinal direction of the vehicle body.
and the output sprocket 15 of engine B and the rear wheel W
A transmission chain 17 that interlocks the drive sprockets 16 of the
Since the chain 17 is disposed so as to pass through the through hole C, the link 9 and the transmission chain 17 are arranged substantially on the same plane of motion without interfering with each other, making the device more compact. In addition, the width of the vehicle can be reduced. According to the second aspect of the invention, a synthetic resin chain slider 18 is attached to the inner surface of the through hole C for regulating the lower limit of the transmission chain 17 passing through the through hole C. Excessive vibration of the chain slider 18 can be suppressed, and its durability can be improved.Moreover, the link 9 also serves as a mounting bracket for the chain slider 18, and the structure is simple.

[Brief explanation of the drawing]

Fig. 1 is a schematic rear side view of a motorcycle equipped with the device of the present invention, Fig. 2 is a plan view of the rear oak showing the installation position of the shock absorber, and Fig. 3 is an enlarged sectional view taken along the line mm in Fig. 1. 4 is a sectional view taken along the line W-N in FIG. 3, and FIG. 5 is a buffer characteristic diagram of the buffer. B...Vehicle frame, C...Through hole, D...
...Buffer, E...Engine, F...Rear fork, 9...Link, 12...Tension rod, 15...
Output sprocket, 16... Drive sprocket, 1
7...Transmission chain, 17a...Lower side thereof, 18...Chain slider. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. The front end of a rear fork F that supports the rear wheel W is pivotally supported on a vehicle body frame B so as to be able to swing vertically, and the front end of a link 9 pivotally connected to the intermediate portion of this rear fork F and the vehicle body frame B. A shock absorber D is interposed between the tension rod 12 and the rear end of the tension rod 12, which is pivotally supported on the body frame B so as to be vertically swingable, is pivotally connected to the link 9. A transmission chain 17 for interlocking the output sprocket 15 of the engine E and the drive sprocket 16 of the rear wheel W is arranged so that the chain 17 passes through the through hole C. A rear wheel suspension system for a motorcycle, characterized by: 2. The front end of a rear fork F supporting the rear wheel W is pivotally supported on the vehicle body frame B so as to be able to swing vertically, and a shock absorber is provided between the front end of the link 9 pivotally attached to the intermediate portion of the rear fork F and the vehicle body frame B. D is interposed, and the rear end of the tension rod 12, which is vertically swingably supported on the body frame B, is pivotally connected to the link 9, and the link 9 has a through hole C that opens in the longitudinal direction of the vehicle body. A transmission chain 17 for interlocking the output sprocket 15 of the engine E and the drive sprocket 16 of the rear wheel W is arranged so that the chain 17 passes through the through hole C, A rear wheel suspension system for a motorcycle, characterized in that a synthetic resin chain slider 18 is attached to the inner surface of the transmission chain 17 to restrict the lowering limit of the transmission chain 17 passing through the through hole C.