JPH028878Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a level display device for chain adjustment in a two-wheeled motor vehicle.

(Prior Art) Rear wheel drive chains generally have a certain degree of slack (play), but if this slack becomes too large, problems such as the chain breaking or coming off during driving are likely to occur.

However, when the chain is not running, the entire chain sags in a gentle curve (a catenary line), and the amount of sagging at each part is quite small.

Therefore, it is impossible to visually judge whether or not the degree of slack is appropriate.For this reason, it is recommended to check and adjust the tension of the chain. There were many cases where it was too late, or even when it was adjusted, it lacked accuracy.

In order to solve these problems, the present applicant provided a technique described in Japanese Utility Model Application Publication No. 148462/1983 prior to filing this application.

In this technique, a chain cover attached to a swing arm is hung down integrally, and an index is attached to the hanging part.

This method achieves the intended purpose as a level display device, but since it is a type that is an integral extension of the conventional chain cover, it is not only disadvantageous in terms of cost, but also has the effect of making the cover itself considerably larger. As a result, there is a risk that the appearance of a two-wheeled motor vehicle may be impaired.

(Purpose of the invention) This invention was made in order to eliminate the above-mentioned conventional drawbacks, and aims to reduce the cost as a level display device and to make it advantageous in terms of appearance.

(Structure of the invention) In order to achieve the above object, this invention provides an index indicating the degree of chain slack on the front support frame of the swing arm of a two-wheeled motor vehicle.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In FIG. 1, 1 is a vehicle body frame on which an engine 2 is mounted. In this body frame 1,
An arm pivot 3 is provided, and a swing arm 4 shown in FIG. 2 is pivotally supported via this pivot 3.

As shown in FIG. 2, this swing arm 4 includes an arm upper frame 7 having a pair of left and right first frame parts 5 and a second frame part 6 continuous between both the first frame parts 5, and an arm upper frame 7. The main frame body is a swing arm body consisting of an arm lower frame 8 projecting downward from the rear of the swing arm. Further, each front end of the first frame portion 5 is provided with a pivot connecting portion 12a connected to the arm pivot 3, while each rear end of the first frame portion 5 is provided with an axle 11 of the rear wheel 10. A rear wheel support portion 12b is provided to support the rear wheel support portion 12b.

Reference numeral 13 denotes a rear fixing column that integrally connects the upper and lower arms of the arm upper frame 7 and the arm lower frame 8.

A front connecting frame 14 having a U-shape in plan view is removably connected between the front ends of the arm lower frame 8 in the swing arm main body, and 15 is a connecting member thereof.

Further, from the bottom of each first frame portion 5, there is a forward-slanted right front support frame 16 and a backward-slanted left front support frame 1.
7 are integrally suspended, and a single mounting seat 18 connecting the lower ends thereof is removably fixed on the front connecting frame 14. 19 is a fastener for fixing the same.

Furthermore, a rod rear pivot 20 is provided between the front support frames 16 and 17, and this rod rear pivot 20
As shown in FIG.
It is pivoted at the upper and lower midpoint of 3. bell crank 2
3 has its upper end rotatably connected to the vehicle body frame 1 via a pivot shaft 25, while its lower end is connected to the rear end of a shock absorber 24 whose front end is pivoted to the bottom of the vehicle body frame 1. There is. It is well known that this is called the ippon shock type.

In such a vehicle, a rear wheel drive chain 28 is disposed between a transmission output sprocket 26 in the engine 2 and a rear wheel sprocket 27 of the rear wheel 10.
is stretched as an endless type, and a chain cover 29, which has been commonly used in the past, is provided on the swing arm 4 so as to correspond to the chain cover 29. As shown in FIG. 2, the rear wheel support portion 12b of the first frame portion 5 is provided with a round hole 12c in the left-right direction, and a groove 12d is provided at the rear of the round hole 12c. In this way, a bearing portion for the rear wheel is formed. Eccentric bushings R, in which the axle 11 of the rear wheel 10 is fitted into the eccentric hole _R1 , are respectively fitted into the round holes 12c, and the split grooves 12d are tightened with screw means 12e to make the bushings R rotatable. By fixing the axle 11 of the rear wheel 10 to
can be adjusted back and forth by rotating the eccentric position.

A level display device was added to the motorcycle having the above-mentioned single-shock type shock absorbing mechanism.

That is, A is an index, and this index A is engraved on the outer surface of the left front support frame 17 on the chain side, as shown in FIG.

In this case, S indicates the level of the chain when the slack amount of the chain is zero, and is a so-called reference line. Further, X is the upper limit of the appropriate value when the chain is pushed up with a finger, and Y is the lower limit thereof, and here a circle is engraved to make it easier to judge.

The reason why the front connecting frame 14 is removable from the arm lower frame 8 is to accommodate the endless chain 28, and as a result, the gap between the left front column 17 and the rear fixed column 13 is The chain 28 passes through it. This point is well known.

In the above configuration, the chain 28 can be inspected and adjusted by pushing the chain 28 up with a finger as shown in FIG.
If the chain 28 is located between Y and Y, it is appropriate, and if it is outside this range, the amount of slack may be adjusted using the longitudinal position adjustment device 30 so that the amount of slack becomes an appropriate value.

In the above, circles are engraved as a method of indicating the upper and lower limits of the appropriate values, but semicircular protrusions of a somewhat larger size as shown in FIG. 3 may be used instead. Because it is a protruding shape, it functions as an indicator that is easier to distinguish when mud is attached. Further, although the present invention has been described as a chain drive system, the drive system is not limited to a chain, and a drive system using a toothed belt can also be adopted.

(Effects of the invention) As explained above, according to this invention, an indicator is provided on the front support frame of the swing arm to display the degree of slack in the chain, so there is no need to intentionally change existing members to extension types. Therefore, it is possible to reduce the cost as a level display device for a chain. In addition, since the existing member, the front support frame, is kept the same size and the index is attached, the member does not become large and therefore there is no risk of ruining the appearance of the vehicle body.

In addition, the front support frame of the swing arm with an index is not obstructed by obstacles such as a muffler, so it is clearly visible from the outside, making it easy to see the chain level display and making accurate level adjustments. It is.

[Brief explanation of the drawing]

Fig. 1 is a left side view of a motorcycle showing an embodiment of this invention, Fig. 2 is a perspective view showing the relationship between the swing arm and the chain, and Fig. 3 is an enlarged view of the index portion of Fig. 1. FIG. 1...Vehicle frame, 4...Swing arm,
5...First frame portion, 6...Second frame portion, 7...Arm upper frame, 8...Arm lower frame, 17...(Left side) front support frame, 28...Rear wheel drive chain, A ……index.

Claims (1)

[Scope of utility model registration request] an arm upper frame having a pair of left and right frame portions rotatably connected to the vehicle body frame at a front end portion and supporting a rear wheel at a rear end portion; and a frame portion connecting the two frame portions; and the arm upper frame. The swing arm is composed of a pair of left and right lower arm frames projecting downward from the rear of the arm, and a pair of left and right front support frames connecting the front ends of the arm lower frames and the arm upper frame. Then, on the front strut frame near the rear wheel drive chain,
A level display device for chain adjustment in a two-wheeled motor vehicle, which is provided with an indicator to display the degree of slack in the chain.