JPH035456Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field The present invention relates to an automobile fuel tank.

Prior Art As shown in Fig. 4, the fuel tank of an automobile has a
A fuel injection pipe 2 is connected to the midsection of the inclined surface of the tank body 1, and the fuel injection port 3 of the fuel injection pipe 2 is often provided at a position above the top of the tank body 1. When filling a fuel tank with such a structure, the fuel inlet 3 at the upper end of the fuel injection pipe 2
When the nozzle of the fuel injection nozzle gun 4 is inserted into the tank and fuel is injected, the air inside the tank body is filled with fuel until the liquid level inside the tank body reaches the height a of the connection part of the fuel injection pipe 2 to the fuel tank 1. It travels up the inside of the injection pipe 2 and escapes from the fuel injection port, but when the liquid level in the tank exceeds the level a, it cannot come out from the fuel injection pipe 2, and the pressure of the trapped air inside the tank body rises, making it impossible for fuel to enter. . Therefore, as shown in FIG. 4, the fuel injection pipe 2 is inserted from the inside of the fuel injection port 3.
A breather tube 5 with both ends open is introduced into the tank body 1 through the inside of the tank body and along the slope of the tank body to or near the top of the tank body, and the height of the liquid level in the tank body is a. When the level exceeds , the air inside the tank body is discharged through the breather tube 5 to the vicinity of the fuel inlet 3, so that fuel can be smoothly injected until the tank is filled with fuel.

However, as shown in FIG. 4, when fuel is injected, a portion of the fuel flowing into the tank body 1 from the fuel injection pipe 2 travels along the outer surface of the breather tube 5 and enters the opening of the breather tube 5, as shown by the solid arrow in the figure. , and enters the inside of the breather tube 5 along with the air flow shown by the dashed arrow in the figure. As a result, fuel accumulates inside the breather tube, preventing air from escaping within the tank body, and after the liquid level within the tank body exceeds level a, the air within the tank body cannot escape through the fuel injection pipe. eye,
With air remaining in the tank body, fuel rises inside the fuel injection pipe 2 to the fuel injection port 3, and fuel injection is stopped before the tank is full.

Purpose The present invention solves the above-mentioned problems of conventional fuel tanks, and aims to provide a fuel tank for automobiles in which the breather tube does not become clogged with injected fuel and prevent air from escaping.

Configuration In order to achieve the above object, the present invention has a breather tube near the opening inside the tank body.
The present invention is characterized in that a flow restriction member is provided to restrict the flow of fuel rising toward the opening in the tank body along the outer surface of the breather tube.

Embodiments Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 shows an embodiment in which the present invention is applied to the conventional fuel tank shown in FIG. A flow control member 6 is provided. Other configurations are the same as those in FIG. 4.

As a result, when fuel is injected into the tank body 1, part of the fuel injected into the tank body passes along the outer surface of the breather tube 5 and flows toward the opening inside the tank body, as shown by the solid line arrow in the figure. Even if it rises, it is blocked by the flow restricting member 6 and does not advance further, falling onto the fuel inside the tank body. Therefore, the fuel does not flow into the breather tube 5, and the air inside the tank body continues to flow into the breather tube 5 until the liquid level reaches the top or almost the top inside the tank body, as shown by the dashed arrow in the figure. Since the fuel flows into the tank and exits through the breather tube 5, fuel can be smoothly injected until the tank is full or almost full.

As illustrated in FIGS. 2a, b, and c, the flow restricting member 6 may have various shapes such as a flat plate, a top shape, a dish shape, etc. Using a type of flow restriction member can particularly enhance the flow restriction effect. Alternatively, as shown in FIG. 3, the breather tube 5 may be fixed to the inner surface of the tank body 1, and the support bracket 7 that functions to limit the tube may also be used as a flow restricting member.

Effects As described above, according to the present invention, it is possible to prevent fuel from flowing into the breather tube with an extremely simple configuration, and it is possible to improve the fuel injection performance.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of the present invention, Figures 2a, b, and c are perspective views showing examples of the shape of the flow restriction member, and Figure 3 is a flow restriction member that also serves as a breather tube mounting bracket. Cross-sectional view showing an example of
The figure is a sectional view showing an example of the configuration of a conventional fuel tank. 1...Tank body, 2...Fuel injection pipe, 3...
Fuel inlet, 5...breather tube, 6...flow control member, 7...bracket.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A tank body that contains fuel, and a fuel inlet that opens into the tank body below the top of the tank body and is located at a position higher than the height of the top of the tank body. It has a fuel injection pipe, and a breather tube that is opened at both ends and is guided from inside the injection port of the fuel injection pipe to the tank body through the fuel injection pipe and then to the top of the tank body or near the tank body. In the fuel tank of an automobile, a flow restriction member is provided near the opening in the tank body of the breather tube to restrict the flow of fuel rising along the outer surface of the breather tube toward the opening inside the tank body. fuel tank. (2) The fuel tank according to claim 1, wherein the flow restricting member is fixed to the inner surface of the tank body and also serves as a support bracket for the breather tube.