JPH1120769A - Support structure of engine auxiliary machine for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten design freedom, and strengthen strength by fixing a fender brace for holding rear fender to a power unit, and fitting an engine auxiliary machine to the fender brace. SOLUTION: This motorcycle is provided with a unit swing type power unit 2 fitted to a motorcycle body so as to be free in swinging. The power unit 2 is provided with an engine main body 3 and a transmission case 4 extending backward from one side of the engine main body 3, and rear wheel 5 is journalled at the rear portion of the transmission case 4. The rear wheel 5 is provided with a disk brake device 6, its brake disk 7 is fitted to the rear wheel 5 so as to rotate integrally, and the upper half of the rear wheel 5 is covered by a rear fender 8. The rear fender 8 is supported by a rear fender brace 9 fixed to a transmission case 4, and an engine auxiliary machine is fitted to the fender brace 9. Thereby, the degree of freedom the engine auxiliary machine can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine accessory support structure for a motorcycle.

[0002]

2. Description of the Related Art As a method of mounting an engine accessory, such as a muffler, of a motorcycle provided with a unit swing type power unit to an engine, for example, Japanese Utility Model Publication No. 53-389.
As shown in Japanese Patent Application Publication No. 96-96, there is one in which a base end of a muffler is integrally fixed to an engine exhaust port with a screw or the like.

In the motorcycle described in the conventional example, a stay for mounting a rear fender is fixed near an exhaust port of a muffler with a screw or the like.

[0004]

However, in the case of the above-mentioned conventional engine accessory support structure, the muffler mounting boss often projects rearward from the crankcase of the engine. This boss was in the way when putting on and taking off.

In order to prevent this, it is necessary to make the distance between the crankshaft of the engine and the axle of the rear wheel longer than necessary or to reduce the diameter of the rear wheel. became.

Further, when a stay for attaching a rear fender is attached to a muffler fixed to an engine in a small number of places, the strength is insufficient.

The present invention has been made in consideration of the above circumstances, and has as its object to provide a motorcycle engine accessory support structure that has increased design flexibility and strength.

[0008]

According to a first aspect of the present invention, there is provided a motorcycle accessory support structure for a motorcycle which is attached to a vehicle body so as to swing freely. In a motorcycle having a swing type power unit, a fender brace for holding a rear fender is fixed to the power unit, and an engine accessory is attached to the fender brace.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a first embodiment of a motorcycle to which the present invention is applied, and shows a perspective view of a rear portion of a vehicle body. As shown in FIG. 1, the motorcycle 1 includes a unit swing type power unit 2 which is swingably attached to a body frame (not shown). Power unit 2
Includes an engine body 3 and a conductive case 4 extending rearward from one side of the engine body 3.
A rear wheel 5 is pivotally supported at the rear of the vehicle.

The rear wheel 5 is, for example, a disc brake device 6
The brake disc 7 is attached to the rear wheel 5 so as to rotate integrally therewith, and the upper half of the rear wheel 5 is covered by a rear fender 8. The rear fender 8 is supported by a fender brace 9 fixed to the conductive case 4.

FIG. 2 is a perspective view of the fender brace 9 used in the motorcycle 1 of the first embodiment shown in FIG. As shown in FIGS. 1 and 2, the fender brace 9 is formed by bending a material having strength, such as a steel pipe, into an L-shape, for example, and both ends thereof are bent along the outer shape of the rear fender 8. You. At both ends of the fender brace 9, washers 10 for attaching to the conductive case 4 are integrally formed.

Further, the fender brace 9 is integrally provided with a boss 12 for mounting a muffler 11 as an engine auxiliary device and a boss 14 for mounting a brake caliper 13 constituting the disc brake device 6.

As shown in FIG. 1, the mounting washers 10 at both ends of the fender brace 9 are fixed to bosses 15 protruding from the conductive case 4 with bolts or the like (not shown). The rear fender 8 is, for example, Ω on the fender brace 9.
It is attached with a fixture 16 in the shape of a letter.

Further, the brake caliper 13 is fixed to the brake caliper mounting boss 14 of the fender brace 9 by, for example, a bolt 17 and the muffler mounting boss 1 is mounted.
A muffler 11 is fixed to 2 with, for example, bolts 18.

As shown in detail in FIG. 3, the muffler 11 is floatingly held (float mount) on the fender brace 9 via a cushion material 19 made of an elastic material such as rubber.
Is done.

FIG. 4 shows a motorcycle 1 to which the present invention is applied.
2 is a perspective view of a rear portion of the vehicle body.
The same components as those of the first embodiment are denoted by the same reference numerals.

As shown in FIG. 4, the motorcycle 1 includes a unit swing type power unit 2 which is swingably mounted on a body frame (not shown). The power unit 2 includes an engine body 3 and a conduction case 4 extending rearward from one side of the engine body 3, and a rear wheel 5 is pivotally supported at a rear portion of the conduction case 4.

The rear wheel 5 is, for example, a disc brake device 6
The brake disc 7 is attached to the rear wheel 5 so as to rotate integrally therewith, and the upper half of the rear wheel 5 is covered by a rear fender 8. The rear fender 8 is supported by a fender brace 20 fixed to the conductive case 4.

FIG. 5 is a perspective view of the fender brace 20 used in the motorcycle 1 of the second embodiment shown in FIG. As shown in FIGS. 4 and 5, the fender brace 20 is formed by combining a material having strength, such as a steel pipe, for example, and two vertically extending members are arranged in parallel and their upper and lower ends are connected. And an attachment portion 21 to the conduction case 4 bent along the outer shape of the rear fender 8 is provided integrally or integrally.
At one free end, a washer 22 for attaching to the conductive case 4 is integrally formed.

Further, the boss 23 for mounting the muffler 11 as an engine auxiliary, the boss 25 for mounting an air cleaner 24 as another engine auxiliary, and the brake caliper 1 constituting the disc brake device 6 are provided on the fender brace 20.
The three mounting bosses 26 are provided integrally.

As shown in FIG. 4, the mounting washer 22 of the mounting portion 21 for the fender brace 20 is fixed to a boss 15 protruding from the conductive case 4 with a bolt (not shown) or the like. The rear fender 8 is attached to the fender brace 20 by, for example, the Ω-shaped attachment 16.

Further, the brake caliper 13 is fixed to the brake caliper mounting boss 26 of the fender brace 20 by, for example, a bolt 27, and the muffler 11 is fixed to the muffler mounting boss 23 by, for example, a bolt 28.

The air cleaner 24 is, as shown in FIG.
A nut 29 is embedded in the wall surface, and an air cleaner mounting boss 25 is fixed to the nut 29 via a spacer 30 by, for example, a bolt 31.

Next, the operation of this embodiment will be described.

The muffler 11, which is an engine accessory, is not directly attached to the power unit 2 (engine body 3), but is attached to the fender braces 9, 20 attached to the power unit 2 (conduction case 4). The boss for attaching the muffler, which has been provided, becomes unnecessary.

As a result, the attachment and detachment of the rear wheel 5 becomes easy, and the distance between the crankshaft (not shown) of the engine body 3 and the axle (not shown) of the rear wheel 5 becomes longer than necessary. There is no design restriction such as reducing the diameter of the rear wheel 5. That is, not only the degree of design freedom is increased, but also an extra dead space can be eliminated.

In a conventional unit swing type power unit, an air cleaner as another engine auxiliary device is also directly attached to the power unit.
Although it was necessary to provide a mounting boss on the power unit side, there were also restrictions on the position of the air cleaner,
Since the air cleaner 24 is mounted on the fender brace 20 in the same manner as the muffler 11, the air cleaner mounting boss on the power unit side becomes unnecessary, and the degree of freedom in layout increases.

Further, since the fender braces 9 and 20 are directly mounted on the power unit 2, the mounting strength of the rear fender 8 is increased.

In the above-described embodiment, the muffler 11 and the air cleaner 24 have been described as engine auxiliary devices, but other devices may be used.

As a method of fixing the fender brace 9, for example, one end may be fixed to the conductive case 4 and the other end may be attached to a rear axle (not shown) via a bearing. Further, the rigidity of the fender brace may be made higher, and the fender brace may be supported in a cantilever manner.

[0032]

As described above, according to the engine accessory support structure for a motorcycle according to the present invention, in a motorcycle having a unit swing type power unit which is swingably mounted on a vehicle body, a rear fender holding mechanism is provided. Since the fender brace was fixed to the power unit and the engine accessory was attached to the fender brace,
The boss for mounting the engine accessory, which is conventionally provided in the power unit, is not required, and as a result, the degree of freedom of the layout of the engine accessory is increased.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rear part of a motorcycle body showing a first embodiment of a motorcycle engine accessory support structure according to the present invention.

FIG. 2 is a perspective view of a fender brace used in the motorcycle shown in FIG.

FIG. 3 is an enlarged perspective view of a mounting portion of the muffler shown in FIG. 1;

FIG. 4 is a perspective view of a rear portion of a motorcycle body showing a second embodiment of a motorcycle engine accessory support structure according to the present invention.

FIG. 5 is a perspective view of a fender brace used in the motorcycle shown in FIG. 4;

FIG. 6 is an enlarged perspective view of a mounting portion of the air cleaner shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Power unit 3 Engine main body 4 Transmission case 5 Rear wheel 8 Rear fender 9, 20 Fender brace 11 Muffler (engine auxiliary equipment) 12, 23 Muffler mounting boss 14, 26 Brake caliper mounting boss 24 Air cleaner (engine auxiliary equipment) 25 Air cleaner mounting boss

Claims (1)

[Claims] 1. A motorcycle provided with a unit swing type power unit swingably mounted on a vehicle body, wherein a fender brace 9 for holding a rear fender 8 is fixed to the power unit 2, and an engine auxiliary device 11, An engine auxiliary device support structure for a motorcycle, comprising: