JPS6154636B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frame for a motorcycle equipped with a monochrome suspension.

The Monocross suspension has a single shock absorber interposed between the top of the rear arm, which has a triangular shape on the side, and the frame.It has a good balance in terms of strength and rigidity of the entire vehicle body, and has a short suspension stroke. It has come to be widely used in motorcycles because it has many advantages such as being able to take a longer time and improving handling stability.

Conventionally, in the frames of motorcycles that have adopted this type of monocross suspension, a special bracket or stay must be provided on the frame to pivot one end of the shock absorber, which makes the frame structure complicated and requires a large number of parts. There was a problem with the score being too high. In particular, the shaft support of the shock absorber is
Since it is located at a specific location in the center of the vehicle body, it also has the disadvantage of imposing various restrictions on the structural design of the frame.

The present invention was developed in view of the above circumstances, and has an extremely simple structure in which one end of the shock absorber is pivotally supported using a connecting member that connects the main pipe constituting the frame and the seat rail. To provide a frame for a motorcycle that is easy to assemble and allows for a reduction in the number of parts. Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

FIG. 1 is a side view showing the frame of a motorcycle according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a view taken along arrow A in FIG. FIG. In these figures, the symbol 1
1 indicates a frame, and this frame 1 includes a steering head pipe 1a and a main pipe 1.
b, a seat rail 1c, a seat pillar tube 1d, and a down tube 1e, 1 connected to the rear end of this main pipe 1b via a connecting member described later.
f, backstay 1g and cross tube 1
h, 1i, etc. Reference numeral 2 denotes a rear arm rotatably provided on the frame 1, and the rear arm 2 is formed into a substantially triangular shape when viewed from the side as shown in FIG. Reference numeral 3 denotes a shock absorber interposed between the top of the rear arm 2 and the frame 1, and as shown in detail in FIG. It is provided with a cylindrical spring guide 3d that prevents mud etc. from entering and guides the coil spring 3c, and one end (rear end) is attached to a support part 4 provided at the top of the rear arm 2 with a pin 5. The other end (front end) is pivotally supported within the connecting member 6 with a pin 7.

This connecting member 6 has a cylindrical body part 6a into which the rear end of the main pipe 1b is inserted and connected, and a sufficient internal space that is formed integrally with this cylindrical body part 6a and allows the end of the shock absorber 3 to face therein. It is formed from a hollow part 6b. The front end 1c of the seat rail 1c and the upper end 1 of the seat pillar tube 1d are provided on both sides of the hollow portion 6b of the connecting member 6.
d are connected to each other. In this embodiment, the connecting member 6 is formed by joining a pair of shell-shaped members at flange portions 6c and 6d.

Reference numeral 8 denotes the engine body; 9 and 10 denote brackets that hold the engine body 8;
0 is fixed to the cross tube 1i,
This cross tube 1i is formed flat at both ends as shown in FIG. It has a structure that takes into consideration the following. Reference numeral 11 denotes a mud guard, and a cylinder body 12 surrounding the shock absorber 3 is integrally formed in the front part of the mud guard 11.

Since the frame 1 of the present invention is configured in this way, the rear end of the main pipe 1b is inserted into the cylindrical body part 6a of the connecting member 6 and fixed by welding, and the main pipe 1b is fixed on both sides of the hollow part 6b. Front end 1c of seat rail 1c and upper end 1 of seat pillar tube 1d
The main pipe 1b, the seat rail 1c, and the seat pillar tube 1d can be connected by welding d, respectively. Further, the shock absorber 3 can be attached by fitting one end of the shock absorber 3 into the hollow portion 6b and inserting the pin 7 from the side.

As explained above, according to the present invention, the shock absorber can be installed using the connecting member for connecting the main pipe and the seat rail as is, so there is no need for a special bracket or stay. Therefore, compared to conventional frames, the structure is simpler and the number of parts can be reduced. Also,
Since the shock absorber can be installed where the seat rail widens, the installation work is also easier.

Further, if the connecting member is formed of a pair of shell-shaped members as shown in the embodiment, the manufacturing of the connecting member itself and the connecting operation will be facilitated.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the frame of a motorcycle according to the present invention, FIG. 2 is a plan view thereof, FIG.
FIG. 1... Frame, 1b... Main pipe, 1c
...Seat rail, 1d...Seat pillar tube, 2...Rear arm, 3...Buffer, 6...
Connecting member.

Claims (1)

[Claims] 1. A cylindrical part into which the rear end of the main pipe is inserted and connected, and a hollow part formed integrally with this cylindrical part, to which the front end of the seat rail is connected on both sides, and in which one end of the shock absorber is pivotally supported. A frame for a motorcycle characterized by comprising a connecting member consisting of a portion and a connecting member.