JPH08253184A - Motorcycle chain protector - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the chain protector for motorcycles is to reduce the time and effort required for replacement. [Structure] A fitting portion 32 fitted to the front end swinging shaft portion 8 of a rear wheel supporting swing arm 9 and upper and lower chain guide portions 33 and 34 extending rearward from the fitting portion 32 are made of rubber or It is integrally molded with resin. The fitting portion 32 is provided with a front opening portion 38 that can be fitted to the swing shaft portion 8 from the rear side. Preferably, a tongue portion 40 for pressing the inner peripheral surface of the opening portion against the swing shaft portion is integrally formed at the upper and lower ends of the opening portion 38 of the fitting portion. Further, in order to improve wear resistance, the linear protrusions 42, 4 formed on the chain guide portions 33, 34
A resin layer or rubber layer 44 having excellent wear resistance is formed on the surface of the No. 3 facing the chain. In addition, a pressing plate 48 extending from the connecting portion 35 to the upper and lower chain guide portions 33 and 34.
Thus, the pressing accuracy is improved by holding and fixing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain protector for a motorcycle, which is fixed to a swing arm for supporting rear wheels and guides a chain for driving rear wheels.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional chain protector 1.
FIG. 3 shows an example of a ring-shaped fitting part 2 and upper and lower chain guide parts 3, which extend rearward from the upper and lower ends of the fitting part 2.
4 and a wall portion 5 that fills the space between the guide portions 3 and 4 are integrally provided. In FIG. 5, the fitting portion 2 is fitted to the front end swing shaft portion 8 of the swing arm 9 for supporting rear wheels. , The intermediate wall 5 to the side surface of the swing arm 9 with the washer 10 and the bolt 11
It has a structure to be fixed by.

As shown in FIG. 6, each chain guide portion 3, 4 is integrally formed with a linear projection 14 facing the chain 13.

When the chain protector 1 is assembled, since the fitting portion 2 is annular, the swing arm 9 shown in FIG. 5 is removed from the bracket 17 of the frame 16 and fitted from the left side. The portion 2 is fitted into the swing shaft portion (pivot pipe) 8 and fixed to the swing arm 9 with bolts 11. After that, the swing shaft portion 8 of the swing arm 9 is inserted between the left and right brackets 17, and the shaft 1
The swing arm 9 is attached by inserting 8.

Another conventional technique is as follows.
No. 90, and as shown in FIG. 7, the chain protector 20 is formed in a U-shape that opens rearward.

[0006]

In the protector 1 shown in FIGS. 5 and 6, since the fitting portion 1 is annular, the swing arm 9 must be removed from the bracket 17 of the frame 16 at the time of attachment / detachment. I won't. Moreover, since the swing arm 9 is provided with the rear wheels and the chain is engaged with the rear-wheel drive chain sprocket, it takes a lot of time to attach and detach the swing arm 9, so that the protector 1 can be replaced with a new one. After all, it will be a big one.

Further, the fitting portion 2, the chain guide portions 3, 4
The wall portion 5 and the wall portion 5 are integrally formed of resin or rubber, but the chain 13 is in sliding contact with the tip end surface of the linear protrusion 14, and only this portion is abraded intensively. On the other hand, if a material having high wear resistance and high hardness is used as the material, the material cost becomes high, while if the material cost is suppressed, the abrasion of the ribs 14 becomes severe and the replacement time becomes short.

In the protector 20 of FIG. 7, the fitting portion 21
Since it has a shape that opens rearward, it will be fitted into the swing shaft portion (swing arm pivot pipe) 8 from the front, but since the engine is located on the front side,
This becomes an obstacle, and it is almost impossible to fit it from the front side with the swing arm attached. Therefore, even with such a structure, the replacement of the protector 20 involves the attachment and detachment of the swing arm, and the work is troublesome.

An object of the present invention is to facilitate the attachment and detachment work of the protector and improve the wear resistance and the mounting accuracy to extend the replacement time, thereby reducing the labor required for the protector replacement work.

[0010]

SUMMARY OF THE INVENTION In order to facilitate the attaching and detaching work of a protector, the invention according to claim 1 of the present application is a fitting portion which is fitted to a front end swinging shaft portion of a swing arm for supporting rear wheels, A motorcycle in which upper and lower chain guide portions extending rearward from upper and lower end portions of the fitting portion are integrally formed of rubber or resin and fixed to a side surface of a swing arm to guide a rear wheel drive chain. In the above chain protector, the fitting portion is provided with a front opening portion that can be fitted to the swing shaft portion from the rear side.

[0012] In order to improve the mounting accuracy, the present invention
In the invention described above, the tongue portions are formed at the upper and lower ends of the open portion of the fitting portion so as to confine the swing shaft portion in the fitting portion.

In order to reduce the cost and improve the wear resistance, the invention according to claim 3 of the present application is a fitting portion which is fitted to a front end swing shaft portion of a swing arm for supporting a rear wheel, and the fitting portion. The upper and lower chain guide parts that extend rearward from the upper and lower ends of
In a chain protector of a motorcycle, which is integrally formed of rubber or resin and is fixed to the side surface of a swing arm to guide a rear-wheel drive chain, a surface of a linear protrusion formed on a chain guide portion facing the chain. Further, a resin layer or a rubber layer having excellent wear resistance is formed.

In order to keep the cost low and improve the mounting accuracy, the invention according to claim 4 of the present application is a fitting portion fitted to the front swing shaft portion of a swing arm for supporting rear wheels, and a fitting portion of the fitting portion. In a chain protector for a motorcycle, which is integrally formed of rubber or resin with upper and lower chain guide portions extending rearward from upper and lower end portions and fixed to a side surface of a swing arm to guide a rear wheel drive chain, A connecting part that integrally connects the upper and lower chain guide parts is formed in the middle part in the front-rear direction, and a holding plate that covers the connecting part and covers the upper and lower chain guide parts is arranged on the side surface of the chain protector. The chain protector is pressed and fixed to the side of the swing arm.

[0014]

[Operation] The chain protector is attached and detached with the swing arm attached to the frame. That is, the chain sprocket is pushed forward along the side surface of the swing arm attached to the frame bracket, and the fitting portion is fitted to the swing shaft portion through the front opening portion.

The pressing plate is arranged so as to straddle the connecting portion and the upper and lower chain guide portions, and is fixed to the side surface of the swing arm with bolts or the like.

[0016]

2 is a side view of a chain protector unit to which the inventions of claims 1 to 4 are applied. The protector 30 includes a fitting portion 32 and a fitting portion 32. The upper and lower chain guide portions 33 and 34 extending rearward from the upper and lower end portions and a connecting portion 35 that integrally connects these guide portions 33 and 34 are integrally provided.
It is integrally molded with natural rubber or synthetic resin such as vinyl chloride.

The fitting portion 32 is formed in a semi-circular shape having a front opening having a front opening 38, and the upper and lower ends of the opening 38 extend in the forward direction and extend in the forward / downward direction.
A tongue portion 40 that is inclined so as to come to the side is integrally formed. The tongue portion 40 can be pushed outward against the elasticity of the tongue portion 40, and at the time of fitting the swing shaft portion, the swing shaft portion is pressed in the direction of the circle center O1 of the fitting portion 38. It is inclined at an angle of obtaining (approximately 45 °).

The upper guide portion 33 is integrally formed with an upwardly projecting linear projection 42 over substantially the entire width in the front-rear direction, and the lower guide portion 34 is formed over substantially the entire width in the front-rear direction. Downwardly projecting strip protrusions 43 are integrally formed, and the end faces of the strip protrusions 42, 43 extend over substantially the entire area in the front-rear direction.
A resin layer (for example, a tetrafluoroethylene resin layer or the like) having excellent wear resistance or a rubber layer 44 is formed.

A fitting hole 45 for the collar 46 is formed on the center line C of the vertical width of the connecting portion 35. The fitting hole 45 for the collar 46 is inclined with respect to the swing arm 9 as shown in FIG. It is formed so as to be perpendicular to the side surface.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1. The sectional shape of the chain protector 30 is the swing arm 9
The swing arm 9 is formed in a U-shape that opens toward the side, and is formed in such a size that the outer circumference of the swing arm 9 can be covered without rattling.

The lateral width of each of the linear projections 42, 43 is slightly smaller than the width of the roller of the chain 13, so that the linear projection 4 has a play between the left and right plates of the chain 13.
2, 43 can be engaged.

The upper protrusion 42 is formed higher than the meshing depth with the chain 13 and meshes with the chain 13 in a normal running state, but the lower protrusion 43 is lower than the upper protrusion 42. Is also formed low.
The lower chain portion is usually separated from the chain 13 and comes into contact with the strip-shaped protrusions due to the vertical movement of the lower chain 13 caused by the vibration of the swing arm 9.

A cylindrical nut 47 is fixed to the side surface of the swing arm 9 by caulking, for example, and a collar 46 is provided between the caulking nut 47 and the pressing plate 48, and the outer diameter of the collar 46 is a fitting hole. It matches the diameter of 45.

The protector 30 is entirely covered by the swing arm 9 and the collar fitting hole 45 has a collar 46.
Is fitted to the side opposite to the swing arm side,
A pressing plate 48 that covers the connecting portion 35 and extends over the upper and lower guide portions 33 and 34 is arranged. The protector 30 is pressed and fixed to the side surface of the swing arm by the pressing plate 48 by screwing the bolt 50 inserted through the pressing plate 48 to the nut 47.

FIG. 1 shows a side view at the time of mounting, in which the pressing plate presses the entire connecting portion 35 and also extends forward and downward in the upper and lower portions 35a to press the guide portions 33 and 34, respectively.

The fitting portion 32 is fitted to the swing shaft portion 8 of the swing arm 9, and the tongue portion 40 is brought into pressure contact with the swing shaft portion 8,
The fitting portion 32 is firmly fitted to the swing shaft portion 8.

In front of the protector 30, the output gear sprocket 5 such as a crankcase is formed in the same vertical plane as the protector 30.
2 is located, and the chain 13 is wound between the sprocket 52 and the drive gear sprocket (not shown) at the rear end of the swing arm.

The operation and replacement work will be described. During traveling, the protector 30 swings up and down integrally with the swing arm 9 about the swing axis O1, while the chain 13
Swings up and down about the output sprocket shaft center O2, and mainly the upper protrusion 42 slides on and guides the chain 13 to prevent contact with the swing arm 9.

The sliding contact between the chain 13 and the linear projection 42 is taken care of by the resin layer or rubber layer 44 having excellent wear resistance, so that the speed of wear can be reduced.

When the protector 30 is replaced after a certain period of use, the bolt 50 and the pressing plate 48 are removed, and the fitting portion 32 is pulled out from the swing shaft portion 8 by pulling it backward. Therefore, the swing arm 9 does not need to be removed.

In the case of new attachment, the fitting portion 32 is fitted to the swing shaft portion 8 from the rear, and the swing arm 9 is covered with the entire protector. Then, the pressing plate 48 is arranged and fixed with the bolt 50. The fitting portion 32 is firmly fixed to the swing shaft portion 8 by the tongue portion 40.

In this embodiment, the protector 30 is positioned by the fitting portion between the fitting portion 32 and the swing shaft portion 8 and the fitting mounting bolts 50 for the entire protector and the swing arm 9, and the pressing plate 48 is used. Since it is pressed against the side surface of the swing arm in a large area, high mounting accuracy can be secured and it can be firmly fixed.

[0033]

【The invention's effect】

(1) According to the invention of claim 1 of the present application, since the front opening portion is formed in the fitting portion, when the protector is attached or detached, the swing arm is not removed and the front engine is obstructed. It can be detached from the rear without having to do so, and the labor and time required for replacement work can be reduced.

(2) According to the second aspect of the invention, the protector is made of resin or rubber, and the tongue portions are formed at the upper and lower ends of the front opening portion so as to be inclined so as to close the opening portions. Therefore, the fitting portion can be brought into close contact with the swing shaft portion even though it has the opening portion, and the mounting accuracy is improved. The opening degree or tightness of the opening portion of the tongue portion can be appropriately changed in consideration of the attachability and the degree of removal.

(3) According to the third aspect of the invention, since the resin layer or the rubber layer having excellent wear resistance is formed on the surface of the linear projection formed on the chain guide portion facing the chain, The wear resistance can be improved while suppressing the total material cost. As a result, the protector replacement period can be extended and the number of replacements can be reduced.

(4) According to the invention described in claim 4, since the protector is widely held and fixed by the pressing plate in a plane shape, even if a soft material is used at low cost, the side surface of the swing arm is flat. By pressing on, it is possible to press with high accuracy and without rattling. As a result, uneven wear due to mounting errors and the like can be reduced, and the life of the protector can be extended.

In summary, each of the inventions of the present application facilitates the attaching and detaching work of the protector and improves the wear resistance and the mounting accuracy to extend the replacement time, thereby reducing the time and labor required for the protector replacement work. Has achieved.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of the vicinity of a chain protector of a motorcycle to which the inventions according to claims 1 to 4 of the present application are applied (FIG. 3).
(I-I sectional view).

FIG. 2 is a side view of a single chain protector.

FIG. 3 is a partial plan view of FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an exploded perspective view of a conventional example.

FIG. 6 is a side view of a conventional example.

FIG. 7 is a cross-sectional view of another conventional example.

[Explanation of symbols]

30 Chain protector 32 Fitting part 3,34 Chain guide part 35 Connecting part 38 Opening part 40 Tongue part 42, 43 row protrusion 44 Resin layer or rubber layer excellent in wear resistance (for example, tetrafluoroethylene resin layer) 48 Presser plate

Claims (4)

[Claims] 1. A rubber or resin is provided with a fitting portion that fits into a front swing shaft portion of a swing arm for supporting rear wheels, and a vertical chain guide portion that extends rearward from upper and lower end portions of the fitting portion. In the chain protector of the motorcycle, which is integrally molded with the swing arm and is fixed to the side surface of the swing arm to guide the rear-wheel drive chain. A chain protector for motorcycles, characterized in that the front opening is provided in the front. 2. The automatic tongue according to claim 1, wherein the upper and lower end portions of the opening portion of the fitting portion are formed with tongue portions for confining the swing shaft portion in the fitting portion. A motorcycle chain protector. 3. A rubber or resin is provided with a fitting portion that fits into a front swing shaft portion of a swing arm for supporting rear wheels, and a vertical chain guide portion that extends rearward from upper and lower end portions of the fitting portion. In a chain protector for motorcycles, which is integrally molded by means of and is fixed to the side surface of the swing arm to guide the rear-wheel drive chain, the striations formed on the chain guide section face the surface facing the chain. A chain protector for a motorcycle, characterized in that a resin layer or rubber layer having excellent wear resistance is formed. 4. A rubber or resin is provided with a fitting portion that fits into a front swing shaft portion of a swing arm for supporting rear wheels, and a vertical chain guide portion that extends rearward from upper and lower end portions of the fitting portion. In a chain protector of a motorcycle, which is integrally molded by means of and is fixed to the side surface of the swing arm to guide the rear-wheel drive chain, a connecting part that integrally connects the upper and lower chain guide parts to the middle part in the front-rear direction. The holding plate that covers the connecting part and covers the upper and lower chain guide parts is arranged on the side surface of the chain protector, and the chain protector is pressed and fixed to the side surface of the swing arm by the pressing plate. A motorcycle chain protector.