JPH075113B2 - Rear arm mounting structure for motorcycles - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a rear arm mounting structure for a motorcycle.

[Prior art]

In recent years, there is a motorcycle that uses a square pipe, which is an extruded material such as aluminum, for a main frame of a motorcycle. Usually, the rear end of the main frame made of this square pipe is provided with a plate-shaped bracket that connects and fixes the rear end of the down tube to the rear end of the rear arm via a pivot shaft. Be pivoted. A foot rest is provided near the pivot of the rear arm.

However, since the square pipe is relatively wide, the nut for fixing the pivot shaft to the plate bracket is largely projected from the outer surface of the plate bracket and avoids interference with the projected nut. Therefore, it is necessary to further widen the position of the footrest portion to the side. For this reason, the rider has a problem in that the rider must ride with the legs relatively wide.

[Problems to be Solved by the Invention]

An object of the present invention is to provide a rear arm mounting structure that narrows the space between both foot rests in the vicinity of the pivotal support of the rear arm and eliminates the deterioration of riding comfort due to the interference between the pivot shaft end of the pivotal support and the foot. To do.

[Means for Solving the Problems]

The present invention that achieves the above-described object is to provide a pair of left and right main frames 1
The rear end and the rear end of the down tube 2 are connected by the plate-shaped brackets 3 on the left and right sides, respectively.
In a motorcycle in which the front end portion of the rear arm 6 is pivotally supported via a pivot shaft 8 and a foot rest 9 is provided in the vicinity of the pivot portion, both shaft ends of the pivot shaft 8 are respectively attached to the plate brackets. 3 through the boss 13 and the outer end of the boss 13 is pivotally supported so as to slightly project from the outer surface of the plate bracket 3, and one bolt head 8a at the pivot shaft end is attached to the outer end of the boss 13. The other screw portion is locked and tightened and fixed by a nut 14 fitted to the shaft center of the boss 13. Further, the outer surface of the both plate-like brackets 3 is covered with an opening so as to surround at least the pivot shaft end. Board 4
The chamfering of the periphery of the opening is performed on both inner and outer side surfaces of the cover plate 4, and the bolt head 8a and the screw portion at the pivot shaft end are respectively inserted into the opening.

Example of Invention

 The present invention will be described below with reference to the embodiments shown in the drawings.

In the motorcycle shown in FIG. 3, 1 is a main frame of a square pipe which is an extruded material of aluminum, and 2 is a down tube. The main frame 1 and the down tube 2 are provided as a left-right pair, and the rear ends of the left and right main frames 1 and the rear end of the down tube 2 are connected and fixed by a plate-shaped bracket 3. The cover plate 4 is attached to the outer surface of the plate bracket 3.

An engine 5 is mounted in a space surrounded by the main frame 1 and the down tube 2. Reference numeral 6 denotes a rear arm, the front end of which is pivotally supported by the plate bracket 3 via a pivot shaft 8 by a mechanism described later, and the rear wheel 7 is supported at the rear end thereof. Further, foot mounting portions 9, 9 are provided on both left and right sides in the vicinity of the pivot portion, and the rider R mounts the feet F, F.

As shown in detail in FIG. 1, the front end of the rear arm 6 is pivotally supported by the plate-shaped brackets 3, 3 via a pivot shaft 8. The front ends of the left and right rear arms 6, 6 are fixed to a laterally extending support pipe 10, and the support pipe 10 is rotatably supported by the pivot shaft 8 via a bushing 11 and bearings 12, 12 at both ends. There is. Pivot axis 8
The plate-shaped brackets 3,3 via the bosses 13,13 at both shaft ends.
Is supported by a bolt head 8a, and the other shaft end is fastened and fixed by a nut 14.

Here, the cover plates 4, 4 on the outer surface of the plate-shaped brackets 3, 3 on both sides
Respectively open so as to surround both ends of the pivot shaft 8, and the bolt head 8a and the screw portion are respectively immersed in the opening. Further, both the inner side surface and the outer side surface of the opening of the cover plate 4 are chamfered. Also,
Inside the opening, the outer end of the boss 13 slightly protrudes from the outer surface of the plate-shaped bracket 3.

The nut 14 is fitted coaxially with the shaft center of the boss 13,
It is in a state of being embedded in the plate-shaped bracket 3 together with the boss 13. Further, as shown in FIG. 2, since the nut 14 and the boss 13 are in an engaging relationship with each other through the flat surface portion 15, by rotating the boss 13, the nut 14 can be rotated.
Can be rotated together so that the shaft end of the pivot shaft 8 can be tightened or loosened.

As described above, in the mounting structure in which the rear arms 6, 6 are pivotally supported on the plate-shaped brackets 3, 3 on both the left and right sides via the pivot shafts 8, the outer surfaces of the plate-shaped brackets 3 are each at least the shafts of the pivot shafts 8. Attach the cover plate 4 opened so as to surround the end, and inside the opening, the bolt head 8a of the pivot shaft end.
Since the screw part and the screw part are respectively immersed, the vehicle width can be shortened and the space between the foot rests 9, 9 can be narrowed. Further, since the bolt head 8a at the pivot shaft end and the screw portion do not interfere with the foot portion, the ride feeling is not deteriorated.

Further, the appearance is improved by attaching the cover plate 4 to the outer surface of the plate bracket 3. Further, since the outer end portion of the boss 13 is made to slightly project from the outer end surface of the plate-shaped bracket 3, when the cover plate 4 is attached to the plate-shaped bracket 3, the protrusion is positioned so as to guide the opening of the cover plate 4. To facilitate installation work.

In addition, since the opening of the cover plate 4 is chamfered on both inner and outer surfaces, the cover plate 4 can be joined by the inner chamfer without damaging the surface of the plate-shaped bracket 3, and the outer chamfer is formed by the screw portion of the pivot shaft 8. It is easy to insert a tool when tightening, and it is also possible to protect the foot.

〔The invention's effect〕

The rear arm mounting structure of the present invention has the above-mentioned configuration, and in particular, since the bolt head and the screw portion of the shaft end of the pivot shaft are immersed inside the opening of the cover plate attached to the plate bracket, Thus, the vehicle width is shortened, the space between the left and right foot rests is narrowed, and the bolt heads and screw portions do not interfere with the foot portions so that the riding comfort is not deteriorated.

Further, since the outer end portion of the boss is projected on the outer surface of the plate-shaped bracket, by guiding the opening of the cover plate by this,
Makes it easy to install the cover plate. Also, since the inside and outside both sides of the opening of the cover plate are chamfered, the cover plate can be joined by the inner chamfer without damaging the surface of the plate bracket, and the outer chamfer facilitates the insertion of the tool into the pivot shaft end. It also protects the feet.

[Brief description of drawings]

1 is a cross-sectional view showing a rear arm mounting structure according to an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIG. 3 is a side view of a motorcycle having the rear arm mounting structure. 1 ... Main frame, 2 ... Down tube, 3 ... Plate bracket, 6 ... Rear arm, 8 ... Pivot shaft, 8a
...... Boss head, 9 ...... foot rest, 13 ...... boss, 14 ...... nut.

Claims (1)

[Claims] 1. A pair of left and right main frames (1) and a rear end of a down tube (2) are connected by plate brackets (3) on both left and right sides, respectively, and both plate brackets (3) are connected.
In a motorcycle in which the front end of the rear arm (6) is pivotally supported via a pivot shaft (8), and a footrest (9) is provided near the pivotal support, both axial ends of the pivot shaft (8) are provided. Through the bosses (13) on the plate-shaped brackets (3) respectively, and pivot the outer ends of the bosses (13) so as to slightly project from the outer surfaces of the plate-shaped brackets (3). One bolt head (8a) at the shaft end is locked to the outer end of the boss (13), and the other screw part is tightened and fixed by a nut (14) fitted to the shaft center of the boss (13). A cover plate (4) that is opened so as to surround at least the pivot shaft end is attached to the outer surface of each of the plate-like brackets (3), and the peripheral edges of the opening are formed on both inner and outer side surfaces of the cover plate (4). And chamfer and insert a bolt head (8a) at the pivot shaft end into the opening. Rear arm mounting structure for a motorcycle, characterized in that parts were immerses respectively.