JPH0129758B2 - - 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.

In motorcycles, it is conventionally known that a gusset is integrally connected between a head pipe and a main pipe whose front end is fixed to the head pipe, thereby reinforcing both pipes and the joints between them. The present invention utilizes the head pipe, main pipe, and gusset to form a liquid tank such as an oil tank in the body frame of such a motorcycle, and also to form a liquid tank such as an oil tank by a pipe that can effectively reinforce the liquid tank. To provide a body frame with a liquid tank for a motorcycle, which has a simple structure and can easily form a small-volume compartment in which a liquid level detection unit is installed in the liquid tank.

In order to achieve this objective, the present invention:
In a motorcycle body frame in which a gusset is integrally connected between a head pipe and a main pipe whose front end is fixed to the head pipe, a liquid tank such as an oil tank is formed by the head pipe, the main pipe and the gusset, and the One end of the partition pipe inserted into the liquid tank is fixed to the gusset, and the other end is fixed to the main pipe, so that the inside of the partition pipe is formed into a small volume partition chamber communicating with the inside of the liquid tank. , the compartment is provided with a liquid level detection unit for detecting the liquid level in the liquid tank.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In this embodiment, the present invention is applied to a cradle type vehicle body frame, and the front end of a main pipe 2 is welded to a head pipe 1 through which a steering shaft (not shown) is inserted, and the welded portion is held by a stay 3. Reinforced. The main pipe 2 extends backward and downward, and the front end of the back frame 4 is welded to the rear end.

A gusset 5 is liquid-tightly welded onto the main pipe 2 along its longitudinal direction, and the front end of the gusset 5 is welded to the head pipe 1 and the stay 3.

The head pipe 1, main pipe 2, and gusset 5 work together to constitute an oil tank To of a motorcycle. That is, the head pipe 1, the main pipe 2, and the gusset 5 form a sealed first storage chamber a, and the rear end of the opening of the main pipe 2 is sealed with a stopper 6, so that the inside of the first storage chamber a is sealed. Also, a sealed second storage chamber b having a small volume is formed. Front and rear communication holes 7 and 8 are bored in the front and rear of the upper surface of the main pipe 2 located inside the gusset 5, and the first and second storage chambers a and b communicate with each other through these communication holes 7 and 8. Ru.

An oil inlet 9 is opened in the front part of the upper wall of the gusset 5, and the oil tank is inserted through this inlet 9.
Oil can be injected into To, that is, into the first and second storage chambers a and b, and the injection port 9 is closed by a cap 10.

Further, a partition pipe 11 is inserted into the rear part of the gusset 5 from its upper surface, and the upper end of this pipe 11 is liquid-tightly welded to the upper wall of the gusset 5, as shown in FIG. As shown in Figures 4 and 5, it is tightly or welded to the inner surfaces of both side walls 5a and 5b of the gusset 5, and its lower end is penetrated and welded to the upper wall of the main pipe 2 to form a compartment C in the first storage chamber a. are doing. This partition pipe 11 not only increases the strength of the oil tank To, but also serves as a partition member that partitions the first storage chamber a into front and rear parts. A plurality of ports 12 are formed in the insertion portion of the partition pipe 11 into the gusset 5, and the inside of the oil tank To and the partition pipe 11 are communicated through these ports 12, and the oil in the oil tank To is communicated with the inside of the partition pipe 11. It is designed so that it can circulate freely and its volume does not decrease. A conventionally known liquid level detection unit 13 is inserted into the partition pipe 11, and the unit 13 is equipped with a float 13b that can move up and down along a detection rod 13a. Tsute oil tank To
The liquid level can be detected.

An outlet 14 for the oil stored in the oil tank To is opened at the rear lower surface of the main pipe 2,
A filter 15 is inserted into this outlet 14,
As shown in FIG. 3, this filter 15 passes through the rear communication hole 8 and faces into the first storage chamber a of the oil tank To. Further, the lower end of the filter 15 is connected via a joint 19 to an outlet pipe P connected to an oil pump or the like.

The upper end of a down tube 16 is welded to the stay 3, which is welded to the connecting portion between the head pipe 1 and the front end of the main pipe 2. It extends rearward, and its rear end is welded to the lower end of a pillar 17, which will be described later.

The upper end of a pillar 17 is welded to the front end of the back frame 4, and the pillar 17 extends downward, and the lower end thereof is 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 To is
Of course, a fuel tank or other liquid tank may also be used.

By the way, when a motorcycle runs, it repeatedly moves up and down, tilts left and right, and tilts back and forth relatively significantly, so the liquid level of the oil in the oil tank To also changes greatly. The oil in chamber C is in the oil tank.
The oil level detection unit 13 installed in the compartment C is stable and is not susceptible to changes in the oil level in the compartment C.
It is possible to always detect the liquid level in the oil tank To with little error even when tilting from side to side or front to back. In particular, the oil tank To is formed long in the front and back along the main pipe 2, and the oil tank To is partitioned into the front and back by the partition pipe 11.
Changes in the overall oil level in To can also be alleviated, and changes in the oil level in compartment C are minimized, making it possible to detect a more appropriate liquid level.

As described above, according to the present invention, in a body frame of a motorcycle in which a gusset is integrally connected between a head pipe and a main pipe whose front end is fixed to the head pipe, oil can be removed by the head pipe, the main pipe, and the gusset. A liquid tank such as a tank is formed, and one end of the partition pipe inserted into the liquid tank is attached to the gusset,
Further, the other ends are respectively fixed to the main pipe, and the inside of the partition pipe is formed into a small volume partition chamber communicating with the liquid tank, and the liquid level in the liquid tank is controlled in this partition chamber. Since a liquid level detection unit is provided for detection, a liquid tank can be easily formed using a head pipe, a main pipe, and a gusset that reinforces both pipes. There is no need to significantly modify the head pipe or main pipe or to prepare a special tank for exclusive use, which can contribute to cost reduction.

Furthermore, even if the liquid level in the liquid tank changes significantly due to running vibrations, the change in the liquid level in the small-volume compartment can be suppressed to a relatively small amount. This allows the liquid level detection unit to detect an appropriate liquid level. Furthermore, by fixing both ends of the compartment pipe forming the compartment to the gusset and head pipe, the overall strength of the liquid tank, which is a combination of the head pipe, main pipe, and gusset, can be effectively increased. can. Since the partition pipe can be used both as such a tank reinforcing means and as a partition member for forming the liquid level detection partition as described above, this contributes to simplifying the structure of the tank.

[Brief explanation of drawings]

Fig. 1 is a side view of the vehicle body frame of the present invention, Fig. 2 is an exploded perspective view of a part thereof, and Fig. 3 is Fig. 2-
4 is a vertical sectional view taken along the line in FIG. 3, and FIG. 5 is a cross sectional view taken along the line shown in FIG. 3. C... Compartment room, To... Oil tank, 1...
Head pipe, 2...Main pipe, 5...Gusset, 11...Division pipe, 13...Liquid level detection unit.

Claims (1)

[Claims] 1 A gusset 5 is installed between the head pipe 1 and the main pipe 2 whose front end is fixed to the head pipe 1.
In the body frame of a motorcycle, the head pipe 1 and the main pipe 2 are integrally connected.
A liquid tank such as an oil tank To is formed by a gusset 5, and one end of a partition pipe 11 inserted into the liquid tank is fixed to the gusset 5, and the other end is fixed to the main pipe 2. The inside of the pipe 11 is formed into a small volume compartment C communicating with the liquid tank, and this compartment C is provided with a liquid level detection unit 13 for detecting the liquid level in the liquid tank. A motorcycle body frame with a liquid tank, which is characterized by: