JPS631670Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting device for a rear shock and a stand for a power unit swing type motorcycle.

In motorcycles equipped with two-cycle engines, so-called swing-type power units are already known in which a rear fork is omitted and the rear wheel is supported by the power unit itself.

A conventional swing type power unit is swingably supported by the vehicle body frame at its front position, and supported by the vehicle body frame via a rear suspension near the rear wheel.

Therefore, the weight of the rear shock was concentrated at the rear of the vehicle body, and since the rear shock was mounted at an angle rather than perpendicular to the horizontal plane, the force of the rear shock was also lost.

Furthermore, since the stand needs to be placed near the center of gravity of the vehicle, a stand bracket is attached to the vehicle body frame, and the stand is attached to the stand bracket.

This invention concentrates the weight near the center of the vehicle body by locating the rear compression midway between the engine and the rear wheels, and also reduces the number of parts by attaching a stand using a bracket, which is a mounting member for the rear suspension. This is an attempt to reduce the amount of waste.

An embodiment of the present invention illustrated in FIGS. 1 and 2 will be described below.

1 is a frame body of a motorcycle, and the frame body 1 is branched left and right from a main pipe 3 whose front end is fixed to a head pipe 2 and a connecting member 4 between the main pipe 3 and the head pipe 2 and extends downward. A down tube 5, a side stay 6 that connects the down tube 5 and the main pipe 3, a channel member 7 that is integrally fixed near the rear end of the main pipe 3 and extends toward the rear of the vehicle body, and a side wall of the channel member 7. The seat rail 8 is fixed to the seat rail 8 and extends toward the rear of the vehicle body.

Thus, the power unit 11, in which the one-cylinder two-stroke engine 9 and the crankcase 10 are integrally constructed, is pivotably pivoted by the main pipe 3 at its front top position (support point P in FIG. 1). supported.

A rear wheel 12 is pivotally mounted to the rear of the power unit 11 in a cantilever manner, and the power unit 11 itself functions as a substitute for a rear fork.

Further, a bracket 13 is fastened to the bottom of the power unit 11 with bolts 14 at an intermediate position between the engine 9 and the rear wheel 12, and a bracket 13 is secured between the bracket 13 and the channel member 7 extending from the main pipe 3 toward the rear of the vehicle body. A rear suspension 15 is interposed in the.

The rear suspension 15 is a rear damper 1.
6. Cushion spring 19 and rear damper 1 interposed between lower seat 17 and upper seat 18 fitted to rear damper 16
The piston rod 16a slides downward when an external force is applied to the rear cushion 15, and returns to its original position by the elastic force of the cushion spring 19. It's summery.

Therefore, the clamping part 16b at the lower end of the rear damper 16 is connected to the cushion mounting part 13 of the bracket 13.
a and is fastened with bolts 21 and nuts 22.

The uppurge joint 20 is fitted into the channel member 7, and a bolt 23 is inserted through the uppage joint 20 and the channel member 7, and then tightened to a nut piece 24 that is integrally fixed to the side wall of the channel member 7. It is worn.

Therefore, the rear wheel 12 is swung up and down about the support point p of the power unit 11, and as a result, the rear wheel 12 is attached to the rear suspension 15 via the bracket 13 fastened to the bottom of the power unit 11. The vibration is transmitted and is damped by the cushioning action of the cushion spring 19 of the cushion 15.

In addition, the main stand 25 is connected to the bracket 13.
bracket 1 by the headed pin 26.
3, and the other end of the pin 26 is prevented from coming off by a split pin 27.

A spring 28 is interposed between a hook 13b integrally formed on the bracket 13 and a hook 25a integrally fixed to the main stand 25.

Therefore, when the main stand 25 is in the upright state, it is firmly maintained in the upright state by the biasing force of the spring 28, and the pipe 13c fixed to the bracket 13 functions as a stopper for the main stand 25. ing.

Further, even when the main stand 25 is in the stored state, the stored state is maintained by the biasing force of the spring 28.

Since the embodiment shown in FIGS. 1 and 2 is constructed as described above, the rear shock 15 and main stand 25 can be attached to the bracket 13 fastened to the power unit 11. Therefore, there is no need to separately provide a part for attaching the main stand 25, so the number of parts can be reduced and costs can be reduced, and the weight of the vehicle can also be reduced.

In addition, in this embodiment, the rear cushion 1
5, bracket 13, etc. are arranged near the center of gravity of the vehicle, the weight is concentrated near the center of gravity of the vehicle, and the moment around the center of gravity of the vehicle is reduced, causing pitching that causes the vehicle to swing vertically and horizontally. and yawing can be reduced.

Furthermore, in this embodiment, the rear pump 15 is connected to the crankcase 1 via the bracket 13.
0, there is no risk of direct impact force being applied to the crankcase 10, and the crankcase 1
The zero strength can be reduced, and the weight of the vehicle can be reduced.

Furthermore, in this embodiment, since the rear cushion 15 is disposed substantially perpendicularly to the direction of the vehicle body, the rear cushion 15 can directly buffer the vertical movement of the rear wheel 12, and the loss of force of the rear cushion 15 is reduced. Therefore, the rear suspension can be used effectively and the riding comfort can be improved.

In the present invention, in a power unit swing type motorcycle in which an engine is disposed in the front part of the crankcase and a rear wheel is disposed in the rear part of the engine, the crankcase is pivotably pivoted to the body frame at the front position. The shock absorber mounting bracket is also used as a stand bracket because the shock absorber is connected to the vehicle body frame via a bracket at an intermediate position between the engine and the rear wheel, and a stand is attached to the bracket. This reduces the number of component parts and reduces costs, as well as reducing the weight of the vehicle.

Further, in the present invention, since the shock absorber and the bracket are arranged near the center of gravity of the vehicle, the weight is concentrated near the center of gravity of the vehicle, so that it is possible to reduce the vibration of the vehicle body in the vertical and horizontal directions.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating an embodiment of a rear suspension mounting device for a motorcycle according to the present invention, and FIG. 2 is a view taken in the direction of arrows. 1... Frame body, 2... Head pipe,
3... Main pipe, 4... Connection member, 5... Down tube, 6... Side stay, 7... Channel member, 8... Seat rail, 9... Engine, 10... Crank case, 11... Power unit, 12... Rear wheel, 13... Bracket, 14... Bolt, 15... Rear cushion, 16... Rear damper, 17... Lower seat, 18... Upper seat, 19... Cushion spring, 20... ...Atsupage joint, 2
1... Bolt, 22... Nut, 23... Bolt, 24... Nut piece, 25... Main stand, 26... Pin, 27... Cotter pin, 28...
…spring.

Claims (1)

[Scope of utility model registration request] In a power unit swing type motorcycle in which the engine is disposed at the front of the crankcase and the rear wheel is disposed at the rear thereof, the crankcase is pivotably pivoted to the body frame at the front position. A rear suspension mounting device for a motorcycle, characterized in that the rear suspension is connected to the body frame by a shock absorber via a bracket at an intermediate position between the engine and the rear wheel, and a stand is attached to the bracket.