JPH05193549A - Chain guide of motorcycle - Google Patents

Abstract

PURPOSE:To obtain a chain guide for a motorcycle which can prolong the service life by fitting a guide piece for guiding the chain into a guide body, installing the guide piece so as to be pressed from the lower side by an outer plate, and removing a through bolt on the guide piece, and setting the frictional limit of the guide piece large. CONSTITUTION:Each projection 11 installed on both of the sides of the upper surface of a guide piece 10 consisting of an elastic body is fitted into each recessed groove 9 formed at the lower edges on both of the sides of a guide body 8 having an inverted recessed sectional surface, and the guide piece 10 is pressed from the below by fitting an outer plate 12 having a recessed sectional surface on the outside of the guide body 8, and the guide body 8 and the upper part of the outer plate 12 are tightened by a through bolt 13, at the rear side lower part of a fork tube 14 on one side of a rear fork, and a chain 7 for driving a rear wheel sprocket 4 is inserted on the upper surface of the guide piece 10.

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 An off-road type motorcycle suitable for traveling on a rough road has a large cushion stroke of a rear wheel to improve cushioning performance. If the cushion stroke of the rear wheel is large, the vibration of the chain driving the rear wheel becomes severe, and the chain may come off the rear sprocket. Therefore, a chain guide is provided on the front side of the front lower portion of the rear wheel sprocket where the chain is fitted to prevent vibration of the chain and prevent the chain from coming off.

As shown in FIGS. 4 and 5, the chain guide is provided with a guide body B having an inverted concave cross section and an outer plate C at the lower rear portion of the hawk tube A on one side of the rear hawk, and the lower portion of the guide body B. Insert the guide piece D molded with an elastic body into the above, and tighten the bolts E through the front and rear parts,
The guide piece D is attached to the guide body B, and the chain F for driving the rear wheel is passed through the upper surface of the guide piece D so that the guide piece D can suppress vibration. For example, the actual exploitation 59-35
See Japanese Patent No. 191.

[0004]

The guide piece D is made of an elastic material so that even if the chain F slides on the upper surface, the noise generated is small, and the guide piece D is a consumable item that is worn by sliding. . Even if the guide piece D is thickened, when the wear reaches the through bolt E and the through bolt E is exposed, a metallic noise is generated between the guide bolt D and the guide bolt D, and the guide piece D cannot be used. Is short.

In view of this point, the present invention is designed so that a guide piece for guiding a chain is fitted into a guide body and is attached so as to be pressed by an outer plate from the lower side. The purpose is to obtain a motorcycle chain guide with a large limit and a long service life.

[0006]

In order to achieve the above object, a chain guide for a motorcycle according to the present invention has an elastic body guide piece in a groove provided on both lower edges of a guide body having an inverted concave cross section. Insert the protrusions provided on both sides of the upper surface, fit the outer plate of concave section on the outside of the guide body and press the guide piece from the lower side, and place the guide body and the outer body on the lower rear side of the hawk tube on one side of the rear hawk. The upper part of the plate is fastened with bolts, and the chain that drives the rear wheel sprocket is passed through the upper surface of the guide piece.

[0007]

The chain fitted with the rear wheel sprocket can suppress vibration by sliding on the upper surface of the guide piece, and can be prevented from coming off the rear wheel sprocket. Since the lower side of the guide piece is wrapped with the outer plate, it is possible to prevent the rear portion of the guide piece from hanging down. Further, since the guide bolt does not pass through the guide piece, the wear allowance can be increased and the service life can be extended.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. The rear wheel 1 is rotatably mounted on an axle 3 at the rear end of a rear fork 2 that slides and cushions around the front end. The rear wheel sprocket 4 is fixed to one side of the rear wheel 1, and the drive sprocket 6 of the engine 5 is
The chain 7 is wound between the and to drive.

The guide body 8 has an inverted concave cross section, and has concave grooves 9 on both lower edges. The guide piece 10 is made of an elastic material and has projections 11 formed on both sides of the upper surface.
The guide piece 10 fits the protrusion 11 into the concave groove 9 of the guide body 8 and fixes it in the front-rear direction. Outer plate 12
Is formed in a concave shape in cross section, and is fitted to both sides of the guide body 8 from below. At that time, the hole position of the through bolt 13 is set so that the guide piece 10 can be pressed from the lower side and compressed by a small amount. The guide body 8 and the guide piece 10 are provided with a protrusion 11 on the guide body 8 side and the guide groove 10 is provided with a groove 9.
May be provided. The guide body 8 and the outer plate 12 are fitted with bolts 13 through the upper side of the rear fork 2
Bracket 15 welded to the hawk tube 14 on one side of the
To install. Then, the chain 7 is passed through the upper surface of the guide piece 10 so as to slide on the upper surface of the guide piece 10.

The chain 7 is prevented from coming off the rear wheel sprocket 4 by hitting the upper surface of the guide piece 10 and suppressing the vibration. Since the guide piece 10 is formed of an elastic body, no noise is generated even if the chain 7 slides. Further, since the lower side of the guide piece 10 is pressed by the outer plate 12, it is possible to prevent the rear side of the guide piece 10 from being deformed downward and drooping. Further, since the through bolt is not passed through the guide piece 10, the guide piece 10 can be used until it is thinly worn and the service life can be extended.

As described above, since the present invention is configured as described above, it is possible to prevent the guide piece from pressing the vibration of the chain and coming off the rear wheel sprocket. Further, the guide piece can be prevented from being deformed by the outer plate, can be used until it is thinly worn, and the service life can be extended.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of the present invention.

FIG. 3 is an overall side view showing an embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a conventional example.

FIG. 5 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 2 Rear hawk 4 Rear sprocket 7 Chain 8 Guide body 9 Recessed groove 10 Guide piece 11 Protrusion 12 Outer plate 13 Through bolt 14 Hawk tube

Claims (1)

[Claims] 1. An outer body having a concave cross section on the outside of the guide body by fitting projections provided on both upper surfaces of a guide piece of an elastic body into concave grooves provided on both lower edges of a guide body having an inverted concave cross section. Fit the plate and press the guide piece from the lower side, and tighten the guide body and the upper part of the outer plate with the bolts through the lower part of the rear side of the hawk tube on one side of the rear fork to secure the chain that drives the rear wheel sprocket. A motorcycle chain guide characterized by being passed through the upper surface of the.