JPS6058074B2 - Motorcycle body frame with liquid tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle body frame with a liquid tank, in which a liquid tank such as an oil tank is formed in a part of a motorcycle.

The body frame of a motorcycle, especially a body frame in which the front end of the main pipe is integrally connected to the head pipe, and the rear end of the main pipe is integrally connected to the back frame, uses the main pipe to connect a liquid tank such as an oil tank. Although a device configured to have a liquid tank is already known, it is difficult to secure a sufficient capacity as a liquid tank, and there are problems in that the appearance is unsightly. Therefore, in order to solve this problem, a structure was developed in which the head pipe and back frame are connected through a liquid tank instead of through the main pipe (see Japanese Patent Laid-Open No. 81332/1983).
has also been proposed, but this would require the liquid level tank itself to have extremely high rigidity to replace the main pipe alone, which would significantly reduce the degree of freedom in designing the tank. This results in a significant increase in the weight of the tank, and there are other problems such as the tank being easily deformed by shocks applied to the vehicle body frame.

The present invention has been proposed in view of the above, and an object of the present invention is to provide a body frame with a liquid tank for a motorcycle, which uses a main pipe to form a liquid tank, but does not have the above-mentioned conventional problems and defects.

In order to achieve such an object, the present invention provides a body frame for a motorcycle of the type described above, in which a cassette is fixed to the head pipe and the main pipe for reinforcing the connecting portion of both pipes, and the cassette and the main pipe are connected to each other. It is characterized by configuring a liquid tank such as an oil tank. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In this embodiment, the present invention is implemented in a cradle type vehicle body frame, and the head pipe 1 through which the steering shaft is inserted is not shown. , the front end of the main pipe 2 is welded, and the welded portion is reinforced by the stay 3.

The main pipe 2 extends rearward substantially horizontally, and the front end of the back frame 4 is welded to the rear end. A cassette 5 is liquid-tightly welded onto the main vibe 2 along its longitudinal direction.The front end of the cassette 5 is welded to the head vibe 1 and the stay 3, and the head vibe 1 and the main vibe are connected to each other by welding. This effectively reinforces the welded joint with 2. Main vibe 2 and cassette 5 work together to form an oil tank T for a motorcycle.

It consists of In other words, main vibe 2 and cassette 5
A sealed oil storage chamber a is formed therebetween, and the rear end of the opening of the main vibe 2 is sealed with a plug 6 to form another sealed oil storage chamber b inside the main vibe 2. These oil storage chambers A and b are front and rear oil distribution ports 7 and 8 that are bored at the front and rear of the upper surface of the main vibrator 2.
communicated with each other through. An oil inlet 9 that is closed by an oil cap 10 is opened in the upper wall of the cassette 5, and is passed through the oil tank T.
. Oil can be injected inside. Further, an oil level measuring vibrator 11 is inserted and fixed into the rear part of the cassette 5 from the upper surface thereof, and a plurality of holes 12 are bored in the insertion part of the vibrator 11 into the cassette 5. This vibe 11 and oil tank T. The inside is connected. An oil level switch (not shown) is provided inside the oil level measuring vibrator 11, and the open end of the vibrator 11 is closed by a lid 13. Further, an oil outlet 14 is opened at the rear lower surface of the main vibrator 2 constituting the oil tank TO, and an oil outlet pipe 15 connected thereto is connected to an oil pump (not shown) or the like. Continued. The upper end of a down tube 16 is welded to the stay 3, which is welded to the connecting portion between the front ends of the head vibe 1 and the main vibe 2. ．． It extends rearward toward , and its rear end is welded to the lower end of a pillar 17, which will be described later.

The upper ends of pillars 17 are welded to the front end of the back frame 4, and the pillars 17 extend downward, and their lower ends are slightly curved forward and welded to the rear end of the down tube 16.

The rear part of the back frame 4 and the middle part of the pillar 17 are connected by a back stay 18.

In addition, in the above embodiment, the oil tank T. may be a fuel tank or other liquid tank, and the cassette 5 may be a fuel tank or other liquid tank.
It may be welded under the main vibe 2. As described above, according to the present invention, a cassette 5 is fixed to the head vibrator 1 and the main vibrator 2, and the cassette 5 for reinforcing the connecting portion of both the vibrators 1 and 2 is fixed, and the cassette 5 and the main vibe 2 are connected to the oil tank. T.

Since the liquid tank is configured as shown in FIG. Moreover, since the cassette 5 that cooperates with the main vibe 2 to form a liquid tank essentially functions as a reinforcing member for the joint between the main vibe 2 and the head vibe 1, the number of parts is increased. In addition, due to the mutual reinforcing effect between the cassette 5 and the main vibe 2, which is the main strength member of the vehicle body frame, the liquid tank as a whole can be made larger than the cassette 5. It is possible to sufficiently increase the rigidity while minimizing the weight increase due to the change in weight, and there is no risk of the tank being deformed by shocks applied to the vehicle frame, and there is no need to form it to the same high rigidity as the main vibrator 2. The cassette 5 has a high degree of freedom in design, and can be installed around the main vibrator 2 and head vibrator 1 in an attractive manner.

[Brief explanation of the drawing]

FIG. 1 is a side view of the vehicle body frame of the present invention, FIG. 2 is an exploded perspective view of a portion thereof, and FIG. 3 is a vertical sectional view taken along the line 2--2 in FIG. TO: Oil tank, 1: Head vibe, 2: Main vibe, 4: Back frame, 5: Cassette.

Claims (1)

[Claims] 1. In a motorcycle body frame in which the front end of the main pipe 2 is integrally connected to the head pipe 1 and the rear end of the main pipe 2 is integrally connected to the back frame 4, the head pipe 1 and the main pipe 2 are connected to each other. A body frame with a liquid tank for a motorcycle, in which a cassette 5 for reinforcing the joint between both pipes 1 and 2 is fixed, and the cassette 5 and the main pipe 2 constitute a liquid tank such as an oil tank T_0.