JPH07110633B2 - Position adjustment device for drive wheel axle of motorcycle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position adjusting device for a drive wheel axle of a motorcycle that supports the drive wheel axle at an accurate position of a rear arm.

[Prior Art] In some motorcycles, a drive wheel is rotatably supported by a rear arm supported by a vehicle body, and a drive force from an internal combustion engine is transmitted to the drive wheel via a power transmission means such as a chain. is there. By the way, a power transmission means such as a chain may be stretched and deflected after long-term use. The bending of the power transmission means is performed by a position adjusting device as shown in FIG. 5, for example. That is, the long hole 2 is formed in the rear arm 1 supported by the vehicle body frame in the axial direction of the rear arm, and the axle 3 is inserted through the long hole 2. Then, the axle 3 is moved in the axial direction of the rear arm by adjusting means (not shown) to adjust the axle 3 to a predetermined position. In some cases, the positioning at the time of this position adjustment is performed by aligning the point 5 of the plate indicator 4 attached to the axle 3 with the scale 6 formed on the rear arm 1.

[Problems to be Solved by the Invention] By the way, a pair of locking portions 4a is formed on the plate indicator 4, and the locking portions 4a are engaged with the rear arm 1 to prevent rattling. There is play between the locking part 4a of the indicator 4 and the rear arm 1 for mounting or due to tolerance. When the axle is tightened and fixed, the plate indicator 7 slops around and tilts. There was a problem that α could not be displayed accurately because of the large influence of α.

The present invention has been made in view of such circumstances, and when the axle of the drive wheel is fastened and fixed to the rear arm, the display by the plate indicator is accurately performed, and the axle is positioned at a predetermined position with easy work. It is an object of the present invention to provide a position adjusting device for a drive wheel axle of a motorcycle, which is capable of easily seeing the scale from the outside and improves workability of position adjustment.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, an elongated hole in the rear arm axial direction is formed in a rear arm pivotally supported by a vehicle body, and an axle of a drive wheel is formed in the elongated hole in the rear arm axial direction. In a position adjusting device for a drive wheel axle of a motorcycle, which movably supports the position of the axle, a length on an outer surface of the rear arm on a straight line in an axial direction of the rear arm passing through an axis of the axle. Scales are formed on both sides in the front-rear direction of the hole, and the axle has a diameter equal to or greater than the axial dimension of the rear arm of the elongated hole and has a perfect circular shape coaxial with the hole inserted into the axle. A plate indicator having an outer peripheral portion is inserted so as to abut the outer surface of the rear arm, and the outer periphery of the plate indicator is aligned with at least one scale on the outer surface of the rear arm. It is characterized in that it is configured to position the axle.

[Operation] According to the present invention, the plate indicator inserted into the axle has a perfect circular outer periphery aligned with at least one graduation on the outer surface of the rear arm formed on both sides of the slot in the front-rear direction. Position. Since the scale for performing this positioning is formed on the outer surface of the rear arm, the scale can be easily seen from the outside, and the workability of position adjustment is improved.

Also, when tightening the axle, even if the plate indicator rotates, the distance between the axis of the axle and the perfect circular outer periphery of the plate indicator does not change. In addition, the axle can be positioned.

Furthermore, since the plate indicator has a perfect circular outer periphery that is formed in a perfect circle on the same axis as the hole that is inserted into the axle, bending can be omitted compared to conventional plate indicators, and molding is easier. it can.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 4.

In the figure, reference numeral 11 is a vehicle body frame.
A front fork 13 is rotatably supported on the head pipe 12 at the front of 11. A handle 14 is provided on the upper end of the front fork 13, and steering wheels 15 are provided on the lower end. An internal combustion engine 16 is mounted in the center of the body frame 11, and a rear arm 17 has a front side portion at a rear end portion.
17a is swingably supported. The rear arm 17 is formed in a bifurcated shape so as to support the drive wheel 18 from both sides, and a long hole 19 is formed in the rear arm axial direction in each rear side portion 17b. An axle 20 having a head portion 20a is inserted into the elongated hole 19, and a tightening nut 21 is screwed to a tip portion 20b protruding from the other rear arm 17 and fixed to the rear arm 17.

This axle 20 has a hub 23 of wheels 22 that make up the drive wheels 18.
Is rotatably supported, and a sprocket is attached to one side of the hub 23.
24 is fixed, and a chain 25, which is a power transmission means, is hung between the sprocket 24 and a sprocket of an output shaft (not shown) of the internal combustion engine 16, and the output shaft of the internal combustion engine 16 is hung through the chain 25. Driving force is transmitted to the wheel 22 to drive the driving wheel 18.

A drum brake 26 is incorporated on the side of the wheel 22 opposite to the sprocket 24, and a brake plate 27 of the drum brake 26 is mounted on the vehicle body frame 11 via a support rod 28.
It is connected to and is locked against rotation. Brake plate
A cam 29 is rotatably supported by the 27, and the rotation of the cam 29 causes the brake shoe 30 to expand and the brake drum 30 to rotate.
It is designed to come into sliding contact with 31 for braking. A brake lever 32 is fixed to the cam 29, and the cam 29 is rotated by operating the brake rod 33.

A support 34 is inserted into the axle 20, and the support 34 is fitted to the rear arm 17 so as to be movable in the rear arm axial direction. As shown in FIG. 3, both side walls in the axial direction of the support body 34 are in direct sliding contact with the inner side wall of the rear arm 17, and guide portions 34a are formed on both side walls in the rear arm axial direction. The upper and lower walls of the rear arm 17 are in sliding contact with each other so that they can be moved smoothly. And support
An adjusting bolt 35 is fixed to the shaft portion 34b of the 34, the adjusting bolt 35 is inserted into a stopper 36 provided at the rear end portion 17b of the rear arm 17, and an adjusting nut 37 screwed to the adjusting bolt 35 is turned. The support 34 is moved in the axial direction of the rear arm.

Between the head 20a of the axle 20 and the rear arm 17, and between the tightening nut 21 screwed to the axle 20 and the rear arm 17, the dimension of the elongated hole 19 in the axle 20 is equal to or larger than the axial dimension of the rear arm. A plate indicator 38 having a diameter is inserted. In the plate indicator 38, a perfect circular outer peripheral portion 38a is formed coaxially with a hole 38b inserted into the axle 20, and is in contact with the outer surface of the rear arm 17. The plate indicator 38 has a circular outer peripheral portion 38.
By aligning a with a scale 39 formed on the outer surface of the rear arm 17, the axle 20 can be positioned. As shown in FIG. 2, the scales 39 are formed on both sides in the front-rear direction of the elongated hole 19 on the straight line L in the axial direction of the rear arm passing through the axis of the axle 20, and the scales 39 are larger than the movement range of the outer periphery 38a of the plate indicator 38. In the position. The axle 20 is positioned by aligning the tangent line S of the outer periphery 38a of the plate indicator 38 with at least one scale 39 on the outer surface of the rear arm 17 formed on both sides of the elongated hole 19 in the front-rear direction. Axle 20 by tightening the tightening nut 21
Is fixed to the rear arm 17.

Next, the operation of this embodiment will be described.

The drive wheel 18 may be detached from the rear arm 17 and assembled during maintenance, inspection, etc., and in this case, the sprocket 24 of the drive wheel 18 and the chain 25 suspended on the output shaft of the internal combustion engine 16 are set to have a predetermined deflection. There is a need. In addition, the chain 25 may be stretched and the amount of bending may be increased due to running for a long time.

In this way, when the adjusting nut 37 is turned when the chain 25 is set to have a predetermined deflection, the adjusting bolt 37 moves in the rear arm direction because the adjusting nut 37 is positioned by the stopper 36. By this movement, the support body 34 becomes integral with the adjusting bolt 35, and moves within the rear arm 17 to move the axle 20 in the rear arm axial direction. At this time, the plate indicator 38 also moves integrally with the axle 20, and the plate-shaped indicator 38 is positioned at a predetermined position by aligning the perfect circular outer peripheral portion 38a of the plate indicator 38 with the scale 39 formed on the rear arm 17. This positioning is performed by the left and right plate indicators 38.

This scale 39 is located at a position that is equal to or greater than the movement range of the outer periphery 38a of the plate indicator 38, and the plate indicator 38 does not cover the scale 39 due to the positioning of the axle 20,
The position of the axle 20 can be surely adjusted.

Further, since the scale 39 is formed on the outer side surface of the rear arm 17, the scale 39 can be easily seen from the outside, and the workability of position adjustment is improved.

In addition, at this time, even if the plate indicator 38 may rotate on the axle, the distance D between the axis O of the axle 20 and the outer peripheral portion 38a of the plate indicator 38 is constant, so that the axle 20 is left and right. Both are accurately positioned.

Next, the tightening nut 21 is screwed onto the tip portion 19b of the axle 20 and tightened to fix the axle 20 to the rear arm 17. At this time, even if the axle 20 is rotated and the plate indicator 38 on the head 20a side is swung around, or the plate indicator 38 is swung around by the tightening nut 21, as described above, Since the distance D between the shaft center O of 20 and the outer peripheral portion 38a of the plate indicator 38 is constant, the axle shaft 20 is accurately positioned.

Further, since the outer peripheral portion 38a of the plate indicator 38 is formed in a perfect circle on the same axis as the hole 38b inserted into the axle 20, the bending process can be omitted and the plate indicator 38 can be easily formed.

[Advantages of the Invention] As described above, according to the present invention, in the plate indicator inserted into the axle, at least one of the outer surfaces of the rear arm, which has circular outer circumferences formed on both sides of the long hole in the front-rear direction, is formed. The axle is positioned according to the scale, and the scale is formed on the outer surface of the rear arm, so that the scale can be easily seen from the outside and the workability of position adjustment is improved.

Also, when tightening the axle, even if the plate indicator rotates, the distance between the axis of the axle and the outer periphery of the plate indicator does not change, so it is easy to position the axle accurately in accordance with the scale. Can be done.

Further, since the outer circumference of the plate indicator is formed in a perfect circle on the same axis as the hole inserted into the axle, the bending can be omitted and the molding can be easily performed as compared with the conventional plate indicator.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle to which the invention is applied, and FIG.
The figure is an enlarged side view of the main part, FIG. 3 is a partial sectional view taken along line III-III in FIG. 2, FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.
FIG. 1 is a side view of a conventional drive wheel axle position adjusting device for a motorcycle. 17 …… Rear arm 18 …… Drive wheel 19 …… Long hole 20 …… Axle 25 …… Chain 34 …… Supporting body 36 …… Adjusting bolt 38 …… Plate indicator 39 …… Scale

Claims (1)

[Claims] 1. A rear arm axially supported by a vehicle body is formed with an elongated hole in the rear arm axial direction, and an axle of a drive wheel is movably supported in the elongated hole to adjust the position of the axle. In a position adjusting device for a drive wheel axle of a motorcycle, graduations are formed on both sides in the front-rear direction of a long hole on an outer surface of the rear arm on a straight line in the axial direction of the rear arm passing through an axis of the axle, and the axle is A plate indicator having a diameter equal to or larger than the axial dimension of the rear arm in the long hole and having a perfect circular outer periphery coaxial with the hole to be inserted into the axle is attached to the outer surface of the rear arm. It is inserted so as to be in contact with each other, and the axle is positioned by aligning the outer circumference of the plate indicator with at least one scale on the outer surface of the rear arm. Position adjustment device for a motorcycle of the drive wheel axle that.