JPH10129566A - Real wheel suspension device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the center of gravity low, and effectively make use of a space underneath a seat. SOLUTION: In this rear wheel suspension device, a rear frame 18 which is vertically rocked about a pivot shaft 19, is pivotally supported by the rear part of a body frame 2, and the axle of a rear wheel 20 is thereby pivotally supported by the rear frame 18. In this case, the rear frame 18 includes a member 19 which is projected below a line L connecting the pivoting part of the body frame 2 with the axle of the rear wheel 20, a link 30 is connected with the rear arm 18 in the aforesaid projected area, the link 30 is extended upward from the connecting point, and its upper end is positioned at a place below a pivoting part of the rear frame 18 with the body frame 2, concurrently the link includes a connecting point with a cushioning device 15, the cushioning device 15 is disposed almost horizontally, and it is connected with the body frame 2 at its front end, and with the link 30 at its rear end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rear wheel suspension system for a motorcycle.

[0002]

2. Description of the Related Art In a motorcycle rear wheel suspension system, a rear arm swinging up and down with a pivot shaft as a fulcrum is pivotally supported at a rear portion of a vehicle body frame. Some have a shock absorber.

[0003]

By the way, if there is a shock absorber under the seat, the center of gravity becomes higher by that amount. Further, it is difficult to lay out a battery or the like.

The present invention has been made in view of the above circumstances, and has as its object to provide a rear wheel suspension system for a motorcycle that has a low center of gravity and can effectively use a space under a seat.

[0005]

In order to solve the above-mentioned problems and to achieve the object, according to the present invention, a rear arm swinging up and down around a pivot shaft is provided at a rear portion of a vehicle body frame. In a motorcycle rear wheel suspension device that supports and supports a rear wheel axle on the rear arm, the rear arm has a member projecting below a line connecting a pivot portion with the vehicle body frame and a rear wheel axle. A link is connected to the rear arm at a lower protrusion, the link extending upward from a connection point, and an upper end is located below a pivot portion of the rear arm with a body frame, and is connected to a shock absorber. Wherein the shock absorber is disposed substantially horizontally, and a front end is connected to the vehicle body frame, and a rear end is connected to the link. Since the shock absorber is arranged below the vehicle body frame, the center of gravity can be lowered and the space under the seat can be effectively used. Moreover, even if the shock absorber is arranged at the lower part of the vehicle body frame, it can be arranged at a relatively high position near the lower part of the pivotal support of the rear arm with respect to the vehicle body frame.

According to a second aspect of the present invention, in the rear wheel suspension device for a motorcycle, the link has a connecting portion at a central portion thereof with another link member having the other end connected to the vehicle body frame. It is characterized by performing a rocking movement around the connection part. Since the shock absorber can be of a compression type, the structure is simple and the cost can be reduced.

According to a third aspect of the present invention, in the rear wheel suspension device for a motorcycle, a connecting portion of the another link member to the vehicle body frame is coaxial with a connecting portion of the shock absorber to the vehicle body frame. It is characterized by. It is coaxial, because the load received from the shock absorber and the load received from another link member are almost the same direction and opposite directions,
These loads cancel each other out, and the load received by the bracket on the vehicle body frame side for supporting the shaft can be reduced.

According to a fourth aspect of the present invention, in the rear wheel suspension device for a motorcycle, the shock absorbing device is disposed above a down tube of the vehicle body frame and below an engine. It is located above a cross pipe spanned between a pair of left and right down tubes, and is characterized in that a part of the front part enters between the pair of left and right down tubes. The shock absorber is protected by a down tube, a cross pipe, and the like, and the engine, the down tube, and the shock absorber can be compactly arranged.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a rear wheel suspension device for a motorcycle according to the present invention will be described. 1 is a side view of a rear wheel suspension device of a motorcycle, FIG. 2 is a side view of a vehicle body frame, FIG. 3 is a plan view of a rear portion of the vehicle body frame, FIG. 4 is a front view of the vehicle body frame, and FIG. Rear view, FIG.
9 is a low-side view of the rear part of the body frame, FIG. 7 is a side view of the rear wheel suspension, FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG.
FIG. 2 is a sectional view taken along line IX-IX in FIG.

The body frame 2 of the motorcycle 1 is configured as shown in FIGS. A main frame 4 extending rearward is provided on the head pipe 3 of the body frame 2.
And a pair of left and right down tubes 5 extending downward and extending rearward from below. Main frame 4
A rear frame 6 extending downward and a pair of left and right upper frames 7 extending rearward are connected to a rear portion of the vehicle. A pair of left and right rear arm brackets 8 extending downward are connected to a rear portion of the upper frame 7. A cross frame 9 is connected between upper portions of a pair of left and right rear arm brackets 8, and the cross frame 9 is connected to a pair of left and right seat frames 1.
0 is connected.

The rear ends of the pair of left and right down tubes 5
It is connected to a cross pipe 11 connected between a pair of left and right rear arm brackets 8. Cross pipes 12 and 13 are connected to the pair of left and right down tubes 5 on the front side and the rear side. Further, a connecting frame 14 is connected to the rear side of the pair of left and right down tubes 5, and the connecting frame 14 is bent upward at a central portion so as to secure a space for disposing the shock absorber 15. Frame 6
Is connected.

An engine 16 is mounted on the main frame 4, the down tube 5, the rear frame 6, the upper frame 7 and the rear arm bracket 8, and a seat 17 is arranged on the upper frame 7, the rear arm bracket 8 and the seat frame 10. A battery 100 is disposed below the seat 17. A rear arm 18 is provided on the rear arm bracket 8 so as to be able to move up and down around a pivot portion constituted by a pivot shaft 19 as a fulcrum. The rear arm 18 is formed in a frame shape, and has a rear wheel axle 20 at the rear end.
Is supported. A chain guard 21 is attached to the rear arm 18, and power is transmitted to a rear wheel 22 provided on a rear wheel axle 20 by a drive chain 24 provided between the rear arm 18 and a drive shaft 23 of the engine 16. Rotate 25. The engine 1 is mounted on the drive shaft 23
The power is transmitted from the output shaft 26 of the No. 6 by a chain 27.

The rear arm 18 is connected to the pivot shaft 1 of the pivot.
A member 18a protrudes below a line L connecting the rear wheel axle 9 to the rear wheel axle 20, and the link 30 is rotatably connected to the rear arm 18 with the support pin 31 as a fulcrum. . The link 30 includes another link member 3
The two connecting portions 32a are rotatably connected to each other with the support pin 33 as a fulcrum.
Are rotatably supported by support pins 34. The support pin 34 is provided on a bracket 35, and the bracket 35 is connected to the cross pipe 13. The link 30 extends upward from a support pin 31 which is a connection point with the rear arm 18, and an upper end 30 a is located below a pivot portion of the rear arm 18 with the vehicle body frame 2 and has a connection portion 30 a with the shock absorber 15. ing.

The shock absorber 15 is disposed substantially horizontally, the connecting portion 15a is rotatably provided on the link 30 via the connecting pin 36, and the connecting portion 15b is rotatably supported by the support pin 34. Is the body frame 2 and the rear end is the link 30
It is connected to the. As described above, since the shock absorber 15 is disposed below the body frame 2, the center of gravity can be reduced, and
The space under the seat 17 can be used effectively. Moreover, even if the shock absorber 15 is disposed below the body frame 2,
It extends upward from the support pin 31 which is a connection point with the rear arm 18 and can be arranged at a relatively high position near the pivotal support portion of the rear arm 18 with the vehicle body frame 2. Hard to receive.

The link 30 has a connecting portion 30b at the center thereof with another link member 32 having the other end connected to the vehicle body frame 2, and performs a swinging movement about the connecting portion 30b. Since the shock absorber 15 can be of a compression type, the structure can be simplified and the cost can be reduced.

The connecting portion 32b of the other link member 32 with the vehicle body frame 2 is coaxial with the connecting portion 15b of the shock absorber 15 with the vehicle body frame 2, so that the shaft receives a load received from the shock absorber 15 and another link. The load received from the member 32 is
Since the directions are almost the same and opposite, these loads cancel each other, and the load received by the bracket 35 on the vehicle body frame side for supporting the shaft can be reduced.

The shock absorber 15 is disposed above the down tube 5 of the vehicle body frame 2 and below the engine 16, and furthermore, a rear portion of the shock absorber 15 is a cross pipe bridged between the pair of left and right down tubes 5. 11, a part of the front part enters between the pair of left and right down tubes 5. As described above, the lower portion of the shock absorber 15 is protected by the down tube 5, the cross pipes 11, 13, and the like, and the engine 16, the down tube 5, and the shock absorber 1 are protected.
The three are compact. Further, as shown in FIG. 9, the shock absorbing device 15 can be disposed close to and below the drive shaft 23 having the left and right sprockets so as to be located between the left and right sprockets, thereby making the device compact.

[0018]

As described above, according to the first aspect of the present invention, since the shock absorber is disposed at the lower part of the body frame, the center of gravity can be lowered and the space under the seat can be effectively used. Moreover, even if the shock absorber is arranged at the lower part of the vehicle body frame, it can be arranged at a relatively high position near the lower part of the pivotal support of the rear arm with respect to the vehicle body frame.

According to the second aspect of the present invention, since the shock absorber can be of a compression type, the structure can be simplified and the cost can be reduced.

According to the third aspect of the present invention, the connecting portion between the other link member and the vehicle body frame is coaxial with the connecting portion between the shock absorbing device and the vehicle body frame. Since the load received from the link member is in the opposite direction in substantially the same direction, these loads cancel each other, and the load received by the bracket on the vehicle body frame side for supporting the shaft can be reduced.

According to the fourth aspect of the present invention, the lower portion of the shock absorber is protected by the down tube, the cross pipe, and the like, and the engine, the down tube, and the shock absorber can be compactly assembled.

[Brief description of the drawings]

FIG. 1 is a side view of a rear wheel suspension device of a motorcycle.

FIG. 2 is a side view of the vehicle body frame.

FIG. 3 is a plan view of a rear portion of the vehicle body frame.

FIG. 4 is a front view of the vehicle body frame.

FIG. 5 is a rear view of the vehicle body frame.

FIG. 6 is a bottom view of the rear part of the vehicle body frame.

FIG. 7 is a side view of the rear wheel suspension device.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a sectional view taken along the line IX-IX of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 15 Shock absorber 18 Rear arm 18a Member 19 Pivot shaft 20 Rear wheel axle 30 Link

Claims (4)

[Claims] 1. A rear wheel suspension system for a motorcycle in which a rear arm swinging up and down with a pivot shaft as a fulcrum is pivotally supported at a rear portion of a vehicle body frame, and the rear arm supports a rear wheel axle. A member protruding below a line connecting the pivot portion with the body frame and the rear wheel axle, connecting a link to the rear arm at the lower protruding portion, the link extending upward from the connection point; The upper end is located below a pivot portion of the rear arm with the vehicle body frame, and has a connection portion with a shock absorber. The shock absorber is arranged substantially horizontally, a front end is on the body frame, and a rear end is on the link. A rear wheel suspension device for a motorcycle, being connected. 2. The link according to claim 1, wherein the link has a connecting portion with another link member connected to the vehicle body frame at the other end at a central portion thereof, and swings about the connecting portion. The rear wheel suspension device for a motorcycle according to claim 1, wherein 3. The automatic connecting device according to claim 1, wherein a connecting portion of the another link member to the vehicle body frame is coaxial with a connecting portion of the shock absorber to the vehicle body frame. Rear wheel suspension for motorcycles. 4. The shock absorber is disposed above a down tube of the vehicle body frame and below an engine, and a rear portion of the shock absorber is provided with a cross pipe extending between a pair of left and right down tubes. The motorcycle rear wheel suspension according to any one of claims 1 to 3, wherein a part of the front portion is located between the pair of left and right down tubes.