JP3140492B2 - Rear wheel suspension for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear wheel suspension system for a motorcycle, and more particularly to a rear suspension system for a motorcycle, which is interposed between a head of a shock absorber disposed between a vehicle body frame and a rear arm and a vehicle body-side support shaft. The present invention relates to an improvement in the structure around the head so as not to impair the performance of the rubber damper.

[0002]

2. Description of the Related Art A rear wheel suspension device for absorbing a shock from a rear wheel is disposed between a frame of a motorcycle and a rear arm. The lower end of the shock absorber that constitutes the device is swingably supported by the rear end of the rear arm, and the head formed at the upper end is provided with a rubber damper for absorbing shock on a vehicle body-side support shaft fixed to the frame. It is rotatably supported with the interposition. For supporting the head, a rubber damper support washer for preventing the rubber damper from protruding outward is mounted on the support shaft, and a nut is screwed on the outside of the rubber damper support washer. By the way, in a motorcycle, a carrier for loading luggage may be attached to a rear portion of a vehicle body. Conventionally, as a mounting structure of the carrier, a slit-shaped mounting groove is formed at the front end of the mounting front leg of the carrier, and the mounting groove is engaged with the rubber damper supporting washer of the support shaft, and a washer is provided outside of the mounting groove. It is common to screw a nut.

[0003]

In the motorcycle described above, a user may replace a standard carrier provided in the market from the beginning with an optional carrier. In this case, a nut, a nut, The washer and carrier are removed, and another carrier is mounted. However, there is a case where the rubber damper supporting washer is dropped and lost at the time of the replacement work, or the rubber damper supporting washer is forgotten to be attached.
If the mounting leg of the carrier is bolted to the vehicle-side support shaft without the rubber damper supporting washer in this way, the rubber damper may protrude from the slit of the mounting leg, and the performance of the rubber damper may be reduced. The present invention has been made in view of the above-described conventional circumstances, and does not cause a rubber damper support washer to drop in a carrier replacement operation or the like, so that the carrier replacement workability is good and the performance of the rubber damper is impaired. It is an object of the present invention to provide a rear-wheel suspension device for a motorcycle without a vehicle.

[0004]

According to the present invention, a shock absorber is provided between a vehicle body frame and a rear arm, and a rubber damper is interposed between a head of the shock absorber and a vehicle body-side support shaft. In a motorcycle rear wheel suspension device in which a washer is brought into contact with an outer end surface of a rubber damper and fixed with a nut, the support shaft has a bolt portion protruding from a distal end of a support portion and a flat surface at a base end portion. Shall be, and the washer is formed by bending a band-shaped plate into a U-shape in plan view so as to grasp the head,
A bolt hole to be fitted to the support shaft is formed at the bottom of the U-shape, and a locking claw that contacts the flat surface is formed by bending inward at the ends of both vertical sides, and the shock absorber The washer can be removed only when the head is removed from the support shaft.

[0005]

According to the motorcycle rear wheel suspension system of the present invention, the washer is formed in a U-shape in plan view, the support shaft insertion hole is formed in the bottom of the washer, and the head of the shock absorber is formed in the vertical side. Formed so that the washer can be removed from the vehicle body-side support shaft only when the shock absorber is removed from the vehicle body-side support shaft, so that when the carrier is removed from the vehicle body-side support shaft, In addition, since the washer does not drop from the vehicle body-side support shaft, the workability of replacing the carrier is good, and the carrier is not attached without interposing the washer, so that the problem of protrusion of the rubber damper can be solved.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1 to 8 are views for explaining a rear wheel suspension system for a motorcycle according to a first embodiment of the present invention. FIG. 1 is a sectional view of a mounting portion of a carrier and a shock absorber, and FIG. FIG. 3 is a sectional view taken along the line II-II in FIG.
FIG. 4 is a side view of the front part of the carrier, and FIG.
6 is a side view of a support shaft portion, FIG. 7 is a side view showing a mounted state of a carrier and a shock absorber, and FIG. 8 is a side view of a motorcycle.

In FIG. 1, reference numeral 1 denotes a motorcycle provided with the apparatus of this embodiment. The motorcycle 1 controls a front fork 4 which supports a front wheel 3 at a lower end thereof by a head pipe 2a at a front end of a body frame 2 to the left and right. A rear arm 6 supporting the rear wheel 5 at the rear end by a rear portion 2c is pivotally supported so as to swing up and down freely, a main frame 2b and a down tube 2d.
In this structure, the engine unit 7 is suspended and supported. Reference numeral 8 denotes a fuel tank.

A seat 10 and a carrier 11 are provided at the rear of the fuel tank 8 on the seat rail 2e of the body frame 2.
And a seat unit 9 that connects the two. The seat 10 is a so-called single seat having a substantially trapezoidal shape in a plan view, and is configured by disposing a cushion material 18 on an upper surface of a seat bottom plate 17a and covering the cushion material 18 with a skin 17b. A locking piece 17c is integrally formed at the front center of the seat bottom plate 17a. This locking piece 17c
Are locked to locked pieces 2f formed on the seat rail 2e.

The carrier 11 is constructed by welding a pair of left and right brackets 15 to a lower surface of a mounting table 19 having a pipe formed in a rectangular shape in a plane. The brackets 15 are in the form of strips that are long in the front-rear direction. The front legs 15b and the rear legs 1
5f are integrally formed, and a connecting piece 15d is integrally formed at the front edge. In addition, 15a is a lightening hole for lightening.

A pair of left and right connecting pieces 15d formed on the front edges of the brackets 15 are fastened to the rear ends of the pair of left and right connecting brackets 12 fixed to the seat bottom plate 17a by bolts 25a. And the connecting bracket 12
Is a bolt 25 planted on the seat bottom plate 17a.
b, it is fixed to the seat bottom plate 17a. A rear leg 15f of the carrier 11 is fixed to a rear end of a reinforcing plate 14 fixed to a lower surface of the seat rail 2e with a bolt 16, and a front leg 15b is connected to a shock of a rear wheel suspension device as described later. It is fixed together with the absorber 13 by fastening.

The rear wheel suspension device has a structure in which a pair of left and right shock absorbers 13 are interposed between the rear end of the rear arm 6 and the seat rail 2e. The shock absorber 13 has lower and upper eye portions 13b and 13a at a lower end and an upper end, respectively. The lower eye portion 13b is pivotally supported by a support bolt inserted into the rear arm 6 so as to be swingable. The upper eye portion 13a is rotatably supported by a support portion 20b of a support shaft 20 implanted in the reinforcing plate 14 via a rubber damper 24 press-fitted therein. A rubber damper support washer 22, a front leg 15 b of the carrier 11, and a washer 21 are sequentially disposed outwardly from an outer end surface of the rubber damper 24 on the bolt portion 20 a protruding from the support portion 20 b, and are fastened and fixed with a cap nut 23. ing. The length of the support portion 20b is set slightly shorter than the rubber damper 24, so that the rubber damper 24 is slightly compressed when the carrier is mounted. Here, a mounting groove 1 is provided at the front end of the front leg 15b.
5c is cut out in a slit shape, and the mounting groove 15c is locked to the bolt portion 20a from behind. The rubber damper support washer 22 is formed by bending a band-shaped plate material into a U-shape in a plan view, and has a bolt hole 22b to be fitted in the bolt portion 20a at a bottom side thereof. The pawl 22a is formed to be bent inward. The vertical side and the locking claw 22a hold the upper eye portion 13a from the front and rear outer sides, and the locking claw 22a is
0c. Thereby, the rubber damper supporting washer 22 is connected to the upper eye portion 13 of the shock absorber 13.
a can be detached from the support shaft 20 only in a state where it is removed from the support shaft 20.

Next, the operation and effect of this embodiment will be described. In the motorcycle equipped with the present embodiment, when replacing the existing carrier 11 with, for example, an optional carrier, the bolt 25a of the connecting piece 15d at the front edge and the bolt 16 of the rear leg 15f are removed, and the nut 23 and the washer 21 are removed. Remove the carrier 11 and attach the mounting groove 1 of the front leg 15
The carrier 11 is removed by moving the carrier 5c rearward so as to be disengaged from the bolt portion 20a of the support shaft 20. Then, the mounting groove of the front leg of the optional carrier is locked to the bolt portion 20a, and the washer 21 and the nut 23 are mounted.
5d, fix the rear leg 15f.

In the conventional motorcycle, the washer contacting the outer end surface of the rubber damper 24 was dropped during the carrier replacement work, and the performance of the rubber damper 24 could be deteriorated. In this embodiment, the rubber damper support washer 22 was used. Is formed in a U-shape, and the upper side portion 13a of the shock absorber 13 is gripped by the vertical side portion. As long as the upper side portion 13a is not removed from the support shaft 20, the cap nut 23, the washer 21, and the carrier 11 are provided. Is removed, the support washer 22 does not come off the support shaft 20. Therefore, the workability of replacing the carrier can be improved, and the mounting groove 15c of the carrier is not pressed against the outer end surface of the rubber damper 24 without mounting the support washer 22, and as a result, the rubber damper 24 can be removed from the mounting groove 15c. Can be prevented from protruding outward, and the performance of the rubber damper 24 can be ensured.

[0014]

[0015]

[0016]

As described above, according to the rear wheel suspension system of the motorcycle according to the present invention, the washer to be brought into contact with the outer end surface of the rubber damper is formed in a U-shape in plan view to grasp the head of the shock absorber. Therefore, when the carrier is removed from the support shaft on the vehicle body side, the washer does not drop from the support shaft on the vehicle body side.Therefore, the workability of replacing the carrier can be improved accordingly, and the carrier can be removed without mounting the washer. There is an effect that it is possible to prevent the rubber damper from being fixed, and to secure the performance of the rubber damper.

[Brief description of the drawings]

FIG. 1 is a sectional view of a mounting portion of a carrier and a shock absorber according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 1;

FIG. 4 is a side view of a front portion of the carrier in the embodiment.

FIG. 5 is a sectional view taken along the line V─V of FIG. 6;

FIG. 6 is a side view of a support shaft portion in the embodiment.

FIG. 7 is a side view showing a mounting state of the carrier and the shock absorber in the embodiment.

FIG. 8 is a side view of a motorcycle provided with the embodiment device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 2e Shut rail (body frame) 6 Rear arm 13 Shock absorber 13a Upper eye part (head) 20 Support shaft 23 Cap nut (nut) 22 Rubber damper support washer (washer) 24 Rubber damper

Claims (1)

(57) [Claims] 1. A shock absorber is provided between a vehicle body frame and a rear arm, a rubber damper is interposed between a head of the shock absorber and a vehicle body-side support shaft, and a washer is applied to an outer end surface of the rubber damper. In the motorcycle rear wheel suspension device which is brought into contact with and fastened with a nut, the bolt is projected from the tip of the support portion with the support shaft.
And a flat surface at the base end, and place the washer on the band-shaped plate in a plan view so as to grasp the head.
It is bent and formed into a U-shape, and the support
Form a bolt hole to be fitted to the shaft, and
The locking claw that contacts the flat surface is bent inward.
A rear wheel suspension system for a motorcycle, wherein the washer can be removed only when the head of the shock absorber is removed from a support shaft.