JPS62199577A - Fuel tank for motorcycle, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel tank for a motorcycle or the like that is provided with a fuel pump between it and a carburetor.

(Prior Art) In general, in vehicles such as motorcycles, the fuel pump is placed in a position that is not easily affected by the heat of the engine, and the fuel tank and the fuel pump and the fuel pump and the carburetor are connected by pipes.

[Problem that the invention seeks to solve]

However, in such vehicles, the fuel tank and engine are often located relatively close to each other, so the fuel pipes are difficult to route.

Therefore, an object of the present invention is to simplify the handling of the fuel supply system.

[Means for solving problems]

In order to achieve the above object, the present invention provides a fuel tank for a motorcycle or the like that is equipped with a fuel pump between it and a carburetor, in which the fuel pump is disposed at a position above the fuel level when the fuel tank is full. It is characterized by

〔Example〕

An embodiment in which the present invention is applied to a motorcycle will be described below with reference to FIGS. 1 and 2.

In the motorcycle 1, a bar handle (not shown) is rotatably supported by a head vibe 3 provided at the front end of a main frame 2, and a front wheel 5 is rotatably mounted on the lower end of a front fork 4 that is rotated by the bar handle. An engine 8 is supported at the bottom of the main frame 2 and is attached to a pivot plate 6 provided at the rear end of the main frame 2 and a down tube 7 provided to the head vibe 3.
is arranged, and the main frame 2 is mounted on the pivot plate 6.
A seat rail stay 10 is connected to the pivot plate 6 to support a seat rail 9 extending rearward from the middle thereof, and a rear fork 1 rotatably supporting a rear wheel 11 is connected to the pivot plate 6.
2 is supported so as to be able to swing up and down, and the engine 8 and the rear wheel 11
A chain 13 for driving the rear wheel 11 is disposed between the two.

A fuel tank 14 is placed on the upper front portion of the main frame 2 and the seat rail 9, and a seat 15 is provided on the upper surface of the seat rail 9 behind the fuel tank 14.

The fuel tank 14 is formed by seam welding a tank top plate 14a and a tank bottom plate 14b.
c is attached to the main frame 2, and the rear attachment part 14d is attached to the seat rail 9. In order to prevent fuel leakage from the fuel tank 14 due to the tilting of the vehicle body when using the side stand, the tank upper plate 14a The fuel supply pipe 14f of the fuel supply port 14e drilled in the fuel tank 14 is vertically extended downward, and the fuel F injected into the fuel tank 14 is regulated so that it becomes full above the approximate center of the tank 14. .

A fuel pump 16 is disposed inside the tank top plate 14a at a position above the liquid level of the fuel F injected into the tank 14 when it is full.

The fuel pump 16 has an oil-proof cover or coating on its outer periphery, has a fuel suction pipe 16a hanging down near the bottom plate 14b inside the tank 14, and has a fuel supply pipe 1.
6b is connected to the main 1 knoblator 17 adjacent to the engine 8 through the tank bottom plate 14b. Note that 16c is a wiring connected to a power source to drive the fuel pump 16, and 18 is a fuel socket.

Further, a canister tank 19 is provided inside and above the fuel tank 14 and is connected to the carburetor 16 via a negative pressure operated valve device 20 .

With this configuration, the space within the fuel tank 14 can be used effectively, and since the fuel F and the fuel pump 16 are arranged close to each other, the fuel suction pipe 16a is shortened and the line resistance is reduced. As a result, bubbles in the fuel pump 16 due to suction negative pressure are less likely to occur. Furthermore, since the fuel supply pipe 16b is short, its handling becomes easy.

FIG. 3 shows another embodiment of the present invention, in which a cover 21C with a fuel pump 15 in the J hole 21b is connected to an O-ring 22 formed on the upper root 21a of the fuel tank 21.
It is screwed in with a bolt 23 through the hole to facilitate inspection, replacement, etc. of the fuel bong 116.

〔Effect of the invention〕

As described above, the present invention provides a seven fuel tank for a motorcycle or the like that is equipped with a fuel pump between the carburetor and the fuel pump is disposed above the fuel level when the fuel tank is full. Therefore, the space inside the fuel tank can be used efficiently, and
Since the fuel and fuel pump are placed close to each other, the fuel suction pipe is shortened, reducing pipe resistance and making it difficult for the fuel pump to bubble up due to negative suction pressure. Furthermore, since the fuel supply pipe can be made shorter, its handling becomes easier.

[Brief explanation of drawings]

1 and 2 show an embodiment in which the present invention is applied to a motorcycle, and FIG. 1 is a side view of the motorcycle, and FIG.
The figure is a cross-sectional side view of a fuel tank, and FIG. 3 is a cross-sectional side view of a fuel tank showing another embodiment of the present invention.

Claims (1)

[Claims] 1. A fuel tank for a motorcycle, etc., which is equipped with a fuel pump between the carburetor and the fuel tank, wherein the fuel pump is disposed at a position above the fuel level when the fuel tank is full. etc. fuel tank.