JPH0214550Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the shock absorber arrangement structure of a motorcycle.

2. Description of the Related Art Motorcycles are known in which swinging arms extend in the front and rear directions from the power unit side at the center of the vehicle body, and the front and rear wheels are supported by each swinging arm. By the way, in the past, JP-A-53-142739 and JP-A-54-
As disclosed in No. 122538, etc., shock absorbers were installed between the front and rear of the frame and the intermediate portion of each swing arm.

However, since each shock absorber is structured to protrude in the longitudinal direction from the front and rear of the frame on which the power unit is mounted, there is a limit to the shortening of the wheel base with such a shock absorber arrangement structure. Furthermore, since the shock absorber is a somewhat heavy object, the conventional arrangement has a limit in terms of lowering the center of gravity of the vehicle body.

Therefore, the purpose of the present invention is to create a shock absorber that simultaneously shortens the wheelbase and lowers the center of gravity of the vehicle body in the above-mentioned swing arm type motorcycle, and also makes it possible to simplify the structure of the frame and reduce its weight. The object of the present invention is to provide an absorber arrangement structure.

In order to solve the above problems and achieve the purpose, the present invention supports the front and rear wheels respectively on swinging arms extending in the front and rear directions from the power unit side in the center of the vehicle body, and responds to each swinging arm. The two-wheeled motor vehicle is characterized in that the two shock absorbers are arranged in parallel on the lower surface of the power unit so as to face in the front-rear direction and at least partially overlap.

Specifically, two shock absorbers are placed on the left and right sides of the vehicle center line, and two more shock absorbers are placed approximately parallel to the exhaust pipe.
Moreover, they are arranged so as to overlap when viewed from the side.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 is a side view of the motorcycle according to the present invention.
FIG. 2 is a side view with the power unit and equipment removed, and FIG. 3 is a bottom view of the same.

The frame 1 has a generally concave shape when viewed from the side, and connects the crankcase 5a of the V-type internal combustion engine 5 to the base portion 1a of the frame 1, and also connects the front upright portion 2 of the frame 1 to the side surface of the front cylinder portion 6 of the engine 5. The engine 5 is mounted by connecting the rear upright part 3 of the frame 1 to the rear part of the rear cylinder part 7. A rear body 10 forming a seat cowl, a step 11, and other equipment are connected and supported by a step bracket 4 integrally molded from a rear upright portion 3 of the frame 1 and extending rearward. 7, it is fastened together with the rear standing portion 3. Seat 12 is on the rear body 10
is mounted, and the engine 5 is mounted in front of the rear body 10.
A front body 13 facing upward is connected.

A swinging arm 20 is pivotally supported on the front upright portion 2 of the frame 1 in a leading manner, and a swinging arm 30 is pivotally supported on the rear upright portion 3 in a trailing manner.

The leading type swinging arm 20 is composed of an upper arm 21 and a lower arm 25. The base of the lower arm 25 is shaped like a fork, and the upper arm 21 is connected to the left frame 1 at its base 22.
The fork portion 2 of the lower arm 25 is pivotally supported on the upper end of the front upright portion 2 of the lower arm 25, and the fork portion 2 of the lower arm
6 is pivoted.

These upper arms 21 and lower arms 2 that constitute the front leading arm 20
5 have intermediate portions 23 and 27 disposed on the same side, that is, on the left side, curves 23a and 27a formed upward in the direction of the steering axis K of the front wheels 45, and front portions 24 and 28 extending forward. It is bent so as to approach the vehicle body center line N. A steering plate 41 is attached to the front portions 24, 28 of both arms 21, 25, and joints 40, 4 are attached at both the middle and lower portions.
This plate 41
An axle 46 of a front wheel 45 is supported in a cantilever manner at a lower portion of the front wheel 45 .

By the way, the steering plate 41 is attached to the front wheel 4.
The upper part 42 of the plate 41 is bent to the side of the tire 48 of the front wheel 45 as shown in FIGS. 4 and 5, and the upper part 42 has a connecting rod. 44 are connected via a joint 43. On the other hand, a steering arm 50 is horizontally swingably supported above the head cover 9 of the front cylinder section 6 of the engine 5, and a steering stem 52 is connected to the base of the arm 50 via a joint 51. A bar handle 53 is fixed to the top in a known manner. The connecting rod 44 and the tip of the steering arm 50 are connected by a joint 54.

On the other hand, the base of the trailing swing arm 30 has a fork shape, and is pivotally supported by the fork portion 31 to the intermediate portion of the rear upright portion 3 on both sides of the frame 1. Such a rear trailing arm 30 is formed by once bending an intermediate portion 32 to the left, moving the rear portion 33 closer to the vehicle body center line N, and further bending it.
3, the axle 36 of the rear wheel 35 is supported in a cantilever manner. The rear wheel 36 and the output shaft on the engine 5 side are connected by a chain sprocket mechanism.

A bracket 55 is pivotally supported on the inside of the lower end of the front upright portion 2 of the left frame 1, facing forward.
A link 56 is pivotally supported at an intermediate portion of the bracket 55, and a lever 29 integrally molded in an arc shape from the left side of the base of the fork portion 26 of the lower arm 25 downward to the rear is pivotally attached to the upper end of the link 56. The front end of a shock absorber 57 is pivotally attached to the lower end of the shock absorber 57. This shock absorber 5
7 is disposed on the left side of the lower surface of the frame 1 facing in the front-rear direction, and is pivotally supported at the rear end by a bracket 59 vertically disposed from a rear cross member 58 of the frame 1. This front shock absorber 57 is located adjacent to the vehicle body center line N and closer to the front of the frame 1.

A bracket 60 is pivotally supported on the inside of the lower end of the rear upright portion 3 of the frame 1 on the right side, facing rearward, and a link 61 is pivotally supported at an intermediate portion of the bracket 60. A boss 34 integrally molded downward from the right side of the fork portion 31 of the arm 30 is pivotally attached to the link 6.
The rear end of a shock absorber 62 is pivotally attached to the lower end of the shock absorber 62. This shock absorber 62 is also arranged on the right side of the lower surface of the frame 1 in parallel with the shock absorber 57, and its front end is pivotally supported by a bracket 64 hanging from the front cross member 63 of the frame 1. This rear shock absorber 62 is also located adjacent to the vehicle body center line N and closer to the rear of the frame 1.

In addition, the exhaust pipe 6 is inserted from the front of the left and right front cylinder parts 6.
6 and 66 extend downward, extend parallel to the lower surface of the frame 1, and gather with exhaust pipes 67 and 67 extending downward from the rear surface of the left and right rear cylinder sections 7, and the muffler 6
8,68. Here, the two exhaust pipes 66, 66 from the front cylinder portion 6 are disposed within the width of the frame 1 on both sides, and outside the shock absorbers 57, 62, as shown in FIG.

As described above, in the swing arm type motorcycle, the shock absorbers 57 and 62, which respond to the front leading arm 20 and the rear trailing arm 30, respectively, are directed toward the lower surface of the frame 1 on which the power unit is mounted in the longitudinal direction. Since the shock absorbers 57 and 62 are arranged so that they do not protrude from the front and rear of the frame 1, it is possible to shorten the wheelbase and lower the center of gravity of the vehicle body. Furthermore, the structure of the frame 1 can be simplified, contributing to weight reduction.

By the way, in the embodiment described above, both the shock absorbers 57 and 62 are arranged adjacent to the vehicle body center line N, and the exhaust pipes 66 and 6 from the front cylinder part 6 are arranged on the outside thereof.
However, as shown in FIG. 6, both shock absorbers 57, 62 are arranged closer to the frames 1, 1 on both sides, and the two exhaust pipes 66, 66 are placed adjacent to the vehicle body center line N. In this way, the exhaust pipes 66, 66 may be disposed between the two shock absorbers 57, 62.

As is clear from the above description, according to the shock absorber arrangement structure of the present invention, it is possible to simultaneously achieve a further shortening of the wheelbase and a lower center of gravity of the vehicle body compared to the conventional motorcycle in a swing arm type motorcycle. As a result, the frame structure can be simplified and lightened.

By arranging the two shock absorbers to the left and right with respect to the center line of the vehicle as in the example, the weight balance between the left and right sides is good, and the cooling is achieved by the running wind without being hindered by the front wheels. The performance of the shock absorber can be stabilized.

Furthermore, by arranging two shock absorbers approximately parallel to the exhaust pipe and so that they overlap when viewed from the side,
Since both the shock absorbers and the exhaust pipe can be arranged in the same horizontal plane, the vertical dimensions of the parts disposed below the power unit can be reduced, and the engine can be lowered to lower the center of gravity of the entire vehicle.

[Brief explanation of the drawing]

Figure 1 is a side view of the motorcycle according to the present invention, Figure 2 is a side view with the power unit and fittings removed, Figure 3 is a bottom view of the same, and Figure 4 is a partially cutaway front view of the steering system. FIG. 5 is a side view of the same, and FIG. 6 is a bottom view similar to FIG. 3 showing a modified example. In the drawing, 1 is a frame, 5 is an engine, 20,
30 is a swing arm, 35, 45 are wheels, 57, 6
2 is a shock absorber.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. The front and rear wheels are respectively supported by swinging arms extending in the front and rear directions from the power unit side at the center of the vehicle body, and two shock absorbers are provided that respond to each swinging arm. A shock absorber arrangement structure for a motorcycle, characterized in that the two shock absorbers are arranged in parallel on a lower surface of the power unit so as to face in the front-rear direction and at least partially overlap. 2. The shock absorber arrangement structure for a motorcycle according to claim 1, wherein the two shock absorbers are arranged to the left and right with respect to the center line of the vehicle body. 3. The shock absorber arrangement structure for a motorcycle according to claim 2, wherein the two shock absorbers are arranged substantially parallel to an exhaust pipe and so as to overlap in side view.