JPS622185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chain guide device used in a chain-driven motorcycle or the like.

Chain-driven motorcycles are
A chain guide is provided to prevent the chain from sagging downward due to slack on the feed side. The chain guide consists of a slider made of synthetic resin or the like with a small coefficient of friction and a member that supports it.The slider is screwed to the support member, and the chain slides on the slider and runs on the slider to support the chain. The sliding surface of the slider gradually wears out as the chain runs, and when the wear progresses and reaches its limit, the slider needs to be replaced.

In conventional chain guide devices, it is difficult to visually inspect slider wear from the outside, and checking this requires disassembling the support member and slider, which makes checking work troublesome and complicated. There is room for improvement in terms of workability, there is a risk of missing the appropriate replacement period, and there is also a risk of interference with the slider mounting screws if the wear limit is exceeded.

The present invention has been made in view of the above, and its purpose is to make the wear limit of the slider easily visible from the outside without disassembling the chain guide device, and to replace the slider at an appropriate time. It is an object of the present invention to provide a chain guide device which can improve the above-mentioned disadvantages of the conventional technology.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a side view of a motorcycle.
As is known, the head tube 3 at the front end of the frame 2
The front fork 4 which supports the front wheel 5 is supported by the front fork 4, the engine 6 is mounted at the front lower part of the frame, and the fuel tank 7 is mounted at the upper part.A seat 8 is extended behind the tank 7. A rear fork 9 supporting the rear wheel 10 is pivotally extended rearward from the
A rear action unit 11 is interposed between the rear fork 9 and the frame. A driven sprocket 12 is provided on the rear wheel 10, and a chain 13 is wound between the driven sprocket 12 and the driving sprocket 14 of the engine to drive the rear wheel 10.

A chain guide device 15 is installed hanging downward at the rear of the rear fork 9 described above.

The chain guide device 15 is as shown in FIGS. 2 to 4, and has inner and outer side plates 16, 1.
7 and a slider 19 supported between the lower portions. The side plates 16 and 17 have approximately L-shaped sides as shown in FIGS. 2 and 4, and the inner side plate 17 has an upwardly rising portion 17a at the front.
The upper portion is provided with a boss portion 17b that protrudes outward, the inner middle portion is provided with a protrusion 17c extending in the front-rear direction, and the lower portion 17d is located on the hanging extension of the upright portion 17a.

Front upright portion 16 of outer side plate 16
The upper part of a is flat, and the intermediate part 16b bulges diagonally downward and outwardly.A protrusion 16c is provided on the lower part of the protrusion 16c inwardly and abuts against the protrusion 17c. 16d is suspended downward parallel to the upper part 16a. The above inner and outer side plates 16 and 17 are overlapped, and the boss portion 17b
Mounting holes 17e are provided at the front and rear of the side plate 16, and mounting holes 16e are provided at the upper part of the upright part 16a of the outer side plate 16, through which bolts 18 are inserted. Provide hanging support. Inner/outer side plate 1
There is a protrusion 16 between the lower parts 16d and 17d of 6 and 17.
A wide gap S that is open in the front-rear direction and downward is formed by abutting 17c and 17c. A chain slider 19 is interposed in this gap S.

The chain slider 19 is as shown in FIGS. 3 and 4, and has lower portions 16d and 17d having a width substantially equal to the inner width of the gap S and having lengths in the front and rear.
It has approximately the same length in the front-back direction. The upper surface 19a, which is long in the front-rear direction, has a substantially arc shape, and the middle portion 1
9b is high, and in the example, the rear part 19c is tilted backward and downward,
The front portion 19d is slightly tilted forward and downward. Attachment holes 19e are formed through the front and rear parts of the lower part of the slider 19 in each thickness direction, and on the other hand, a plate is formed at the front and rear lower parts of the lower parts 16d and 17d of the inner and outer side plates 16 and 17. A screw hole 17f is formed concentrically in the thickness direction through the mounting hole 16f, and the slider 19 is inserted between the heightwise middle part and the lower part of the lower parts 16d and 17d. ,17
A countersunk bolt 20 is inserted and screwed into f, and the slider 19 is clamped between the lower portions 16d and 17d.

A long hole 21 penetrating in the plate thickness direction is provided in the middle part of the slider 19 in the height direction.
Level 1 is a position higher than the main body 20a under the neck of the bolt 20, and is the wear limit position before interference between the chain and the bolt main body during wear. Inner and outer side plates 1 facing the side of hole 21
Both of the lower parts 16d and 17d of 6 and 17, or at least the lower part 16d of the outer one, are provided with an elongated window 22 that matches the elongated hole 21.
It may be approximately the same size as 1 or may be slightly larger.

Below the protrusions 16c and 17c on the slider 19 of the chain guide device 15, there is a chain 1 as described above.
The lower part 13a of the chain hangs down because it is the feed side, is guided and held by the slider upper surface 19a, and the chain 13
It is surrounded by protrusions 16c and 17c above a and by lower side plates 16d and 17d on the left and right sides, and does not move outward.

Next, to explain the operation and effect in detail, the upper surface of the slider 19 wears out over time as the chain 13a runs, and when the wear limit is reached, it hits the elongated hole 21, and the chain hangs over the elongated hole 21. The lower surface of the slider 19, that is, the sliding part, can be seen from the outside through the window 22, and it can therefore be easily confirmed visually from the outside that the slider 19 has reached its wear limit. In this way, the wear of the slider 19,
Due to this, the replacement period for side plates 16 and 17 is
This can be easily confirmed without removing the slider, and it is possible to prevent inadvertent wear of the slider 19 beyond the wear limit, interference between the screw of the slider 19 and the chain, etc.

FIG. 5 shows a modified embodiment, in which the window 122 is enlarged into a circular shape, the upper half of the window 122 extends above the upper surface 19a of the slider 19, and the elongated hole 21 of the slider 19 faces the lower part of the window 122. According to this, as an effect other than the above, mud, etc. that have entered the slider can also be removed from the window 1.
22 and can also be excluded from window 122
By increasing the size, it is possible to significantly remove the thickness of the side plate, and the weight can be reduced. Since the structure is the same as above except for the window, the same parts are given the same reference numerals and detailed explanations are omitted.

As is clear from the above, according to the present invention, the wear limit of the slider of the chain guide device can be easily checked from the outside, and the time to replace the slider can be easily and accurately confirmed without disassembling the chain guide device. It is possible to prevent wear due to use exceeding the wear limit and interference between the chain and slider mounting screws, etc., and the above can be planned with a simple structure without making changes to the guide device. It has the following advantages.

In the embodiment, the present invention was used in a chain guide device for a motorcycle, but the present invention is not limited to the above and may be implemented in any manner.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic side view of a motorcycle, Fig. 2 is a side view of a chain guide device, Fig. 3 is a sectional view taken along the line 3-3 in Fig. 4 is a sectional view taken along line 4--4 in FIG. 3, and FIG. 5 is a view similar to FIG. 2 of a modified embodiment. In the drawing, 12 and 14 are driven sprockets, 13 is a chain, 15 is a chain guide device, 1
9 is a chain support member, and 21 and 22 are wear position detection and display parts.

Claims (1)

[Claims] 1. A slider that slidably supports a part of the chain wound between the driven and driving sprockets, and a side plate that stands integrally on the side of the slider and restricts the lateral movement of the chain. 1. A chain guide device characterized in that the side plate is provided with a through hole for detecting a predetermined wear position of the slider.