JPH05193548A - Chain guide of motorcycle - Google Patents

Abstract

PURPOSE:To obtain a chain guide for a motorcycle which can reduce the chance of grounding by raising the lower edge position of a guide plate, by forming the guide plate to a recessed sectional surface, inserting a guide piece having a guide holes in the front and rear parts, into the guide plate, and tightening the guide plate and the guide piece on the upper side. CONSTITUTION:A guide piece 10 which consists of an elastic body having a guide hole 11 in the longitudinal direction is inserted inside a guide plate 8 which is formed by the bending work to a recessed sectional surface, and the lower edge projection 12 of the guide piece 10 is hooked in a hooking hole 9 on the undersurface of the guide plate 8, and a through bolt 13 is inserted into the upper part of the guide plate 8 and the upper part of the guide piece 10, and screwed with the bracket 14 of a rear fork 2 on the lower part front side of a rear wheel sprocket, and a chain 7 for driving the rear wheel sprocket is inserted into the guide hole 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle chain guide.

[0002]

2. Description of the Related Art In an off-road vehicle suitable for traveling on a bad road on a motorcycle, the cushion stroke of the rear wheel is increased to improve the cushion performance. If the cushion stroke of the rear wheel is large, the chain driving the rear wheel may vibrate violently, and the chain may come off the rear wheel sprocket. Therefore, a chain guide is provided on the front side of the front lower part of the rear wheel sprocket where the chain meshes to prevent vibration of the chain and prevent the chain from coming off.

In the chain guide, a guide plate having an inverted concave cross section is fastened to the lower surface of the rear fork, a guide piece made of an elastic body is inserted in the lower part of the guide plate, and a through bolt is fastened from the lateral direction. Then, the chain slides on the upper surface of the guide piece to suppress the vibration of the chain. See, for example, Japanese Utility Model Laid-Open No. 59-35191.

[0004]

Since the guide piece is tightened to the guide plate with a bolt below the upper surface through which the chain passes, the guide plate projects largely below the chain, and when traveling on rough roads. If you enter the rut of a vehicle traveling in the front, the guide plate may touch the ground,
It has the disadvantage of being deformed or damaged.

In view of the above point, the present invention forms a guide plate in a concave shape in cross section, inserts a guide piece provided with guide holes in the front and back, and fastens the guide plate and the guide piece on the upper side. It is intended to obtain a motorcycle chain guide in which the lower end position of the guide plate can be raised and the chance of grounding can be reduced.

[0006]

In order to achieve the above object, a chain guide of a motorcycle according to the present invention is an elastic body in which a guide hole is formed inside a guide plate bent in a concave shape in the front-rear direction. Insert the guide piece, hook the bottom protrusion of the guide piece into the hook hole on the bottom surface of the guide plate, pass the bolts through the upper part of the guide plate and the upper part of the guide piece, and tighten it to the bracket of the rear hawk on the lower front of the rear wheel sprocket. I put it on and put the chain that drives the rear sprocket through the guide hole.

[0007]

The chain which drives the rear wheel sprocket slides in the guide hole of the guide piece to suppress the vibration, and prevents the chain from coming off the rear wheel sprocket. The guide plate and the guide piece are fastened to each other by the through bolts on the upper side of the guide hole, so that the lower end position of the guide plate can be raised, the chance of grounding can be reduced, and the deformation and damage can be reduced. Further, the through bolt can serve both to attach the guide piece to the guide plate and to attach the guide plate to the bracket of the rear fork, thereby reducing the number of parts.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. The rear wheel 1 is rotatably supported by an axle 3 at the rear end of a rear fork 2 which swings and cushions. A rear wheel sprocket 4 is fixed to one side of the rear wheel 1, and a chain 7 is provided between the rear wheel 1 and the drive sprocket 6 of the engine 5.
Is wound around and driven.

The guide plate 8 is formed of a light alloy plate or a steel plate in a concave shape in cross section, and has a keyhole-shaped retaining hole 9 on its lower surface. The guide piece 10 is formed of an elastic body so as to fit inside the guide plate 8, and has a guide hole 11 in the front-rear direction at the center and a protrusion 12 on the lower surface.
The guide piece 10 is inserted by inserting the protrusion 12 into the hook hole 9, and the bolts 13 are passed through the front and rear parts of the rear hook 2 in the rear fork 2.
It is fastened to the bracket 14 provided on the lower surface of the rear part. Then, the chain 7 is passed through the guide hole 11 so that the chain 7 slides in the guide hole 11.

The chain 7 has a guide hole 11 in the guide piece 10.
The vibration can be suppressed by passing through the inside, and the chain 7 can be prevented from coming off from the rear wheel sprocket 4. Then, the through bolt 1 for attaching the guide piece 10 to the guide plate 8
Since 3 is arranged on the upper side, the lower side of the guide hole 11 can be made thinner, and the lower end of the guide plate 8 can be positioned higher,
The chances of touchdown can be reduced, and deformation and damage can be reduced. Further, the through bolt 13 attaches the guide piece 10 to the guide plate 8 and attaches the guide plate 8 to the rear fork 2
Can also be attached to the bracket 14.

[0011]

As described above, since the present invention is configured as described above, the vibration of the chain driving the rear wheel sprocket can be pushed through the guide hole of the guide piece through the chain, and the chain can drive the rear wheel. You can prevent it from coming off the sprocket. Further, since the through bolt for attaching the guide piece to the guide plate is provided on the upper side, the amount of the guide plate protruding downward from the chain line can be set to a slightly high position, and deformation and damage due to grounding can be reduced. Further, since the through bolt can serve both as the attachment of the guide piece to the guide plate and the attachment of the guide plate to the rear fork, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a guide plate and a guide piece showing an embodiment of the present invention.

FIG. 3 is a rear view of the guide plate and the guide piece showing the embodiment of the present invention.

FIG. 4 is a bottom view of the guide plate and the guide piece according to the embodiment of the present invention.

FIG. 5 is a side view showing a state in which the rear fork is attached, showing an embodiment of the present invention.

FIG. 6 is an overall side view showing an embodiment of the present invention.

[Explanation of symbols]

 2 Rear Hawk 4 Rear Wheel Sprocket 7 Chain 8 Guide Plate 9 Locking Hole 10 Guide Piece 11 Guide Hole 12 Protrusion 13 Through Bolt 14 Bracket

Claims (1)

[Claims] 1. A guide piece of an elastic body having a guide hole provided in the front-rear direction is inserted inside a guide plate bent to have a concave cross section, and a lower end protrusion of the guide piece is used as a hooking hole on a lower surface of the guide plate. It is characterized by passing through bolts through the upper part of the guide plate and the upper part of the guide piece to fasten it to the bracket of the rear hawk on the lower front side of the rear wheel sprocket, and insert the chain that drives the rear wheel sprocket into the guide hole. Motorcycle chain guide.