JPS6238409Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a fuel tank.

Generally, there is a small amount of residual fuel in a car's fuel tank, and when acceleration is applied to the car body due to turning while driving, or when the car body is tilted, the residual fuel is concentrated at the end of the fuel tank and the fuel supply pipe In order to prevent the tip of the tank from completely separating from the fuel and becoming unable to suck the fuel, many tanks are equipped with a reservoir cup inside the tank. The present invention relates to a fuel tank incorporating such a reservoir cup.

Hereinafter, the structure of a conventional fuel tank will be explained based on FIGS. 1 to 3.

Reference numeral 2 denotes a reservoir cup fixed by spot welding to the inner wall of a fuel tank 4 attached to the body of an automobile. The reservoir cup 2 has legs 6 and 8 projecting upward from the side wall of the reservoir cup 2, and are welded to the upper wall of the fuel tank 4 by flanges 10 and 12 formed at the tips of the legs 6 and 8. There is. Further, a pipe 16 is welded to the lower part of the side wall 14 of the reservoir cup 2, and the pipe 16 is configured to surround approximately half the circumference of the reservoir cup 2.

A filter 20 is attached to the tip of a fuel supply pipe 18 that supplies fuel to a carburetor connected to the engine, and fuel is sucked through the filter 20.

According to the above configuration, even if the vehicle body turns right or left and acceleration is applied to the fuel tank 4 or the vehicle body is tilted when there is a small amount of residual fuel, the fuel is stored in the reservoir cup 2. This can considerably prevent the tip of the fuel supply pipe 18 from becoming completely separated from the fuel and becoming unable to suck it.

In addition, when the vehicle shifts from turning motion to straight-line motion and the above-mentioned acceleration is eliminated from the vehicle body or the vehicle body no longer tilts, or when the fuel in the reservoir cup 2 is used and the liquid level in the cup is lower than the liquid level of the fuel around the cup. When the liquid level becomes low, the reservoir cup 2 is removed from around the reservoir cup 2 through the pipe 16.
The structure is such that fuel is supplied inside the tank.

However, with the above configuration, the fuel in the pipe 16 sometimes freezes especially when the temperature is low, such as in a cold region, and the supply of fuel from around the reservoir cup 2 into the reservoir cup 2 is sometimes cut off.
Further, as shown in FIG. 3, when acceleration is applied to the vehicle body in the direction of arrow F or when the vehicle body is tilted and the fuel is biased to the right in FIG. It was thought that the water could leak out of the reservoir cup 2 through the water.

Furthermore, when the fuel flows from around the reservoir cup 2 through the pipe 16 and is supplied into the reservoir cup 2, there is a problem that a large amount of fuel cannot be quickly supplied because the wall resistance of the pipe 16 is large. Ta.

Therefore, the present invention was conceived with the aim of solving the above-mentioned problems.

Hereinafter, an embodiment of the present invention will be described based on FIG. 4. In this embodiment, components that are substantially similar to those shown in FIGS. 1 to 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

Reference numeral 22 denotes a fuel introduction groove which is welded to the side wall 14 of the reservoir cup 2 and whose tip is bent into a substantially U-shape. The groove 22 has an open upper surface and is sloped so that the bottom wall 24 becomes gradually higher toward the tip.

According to the above structure, since the upper surface of the fuel introduction groove 22 is open compared to the pipe 16 shown in the conventional structure, the fuel is less likely to freeze even in cold regions, and even if the part in contact with the groove wall is Even if it freezes, the fuel introduction groove will not be completely blocked, so it is possible to prevent the fuel supply to the reservoir cup 2 from being cut off.

Further, since the upper surface of the fuel introduction groove 22 is open, the siphon effect described in the description of the conventional device does not occur, and therefore, the outflow of fuel from the reservoir cup 2 to the surroundings due to the siphon effect can be prevented. Furthermore, by making the cross-sectional shape of the fuel introduction groove 22 larger, the fuel inflow resistance can be lowered compared to conventional ones, so that a large amount of fuel can quickly flow into the reservoir cup 2 using the introduction groove 22. It is something that can be done.

In the above embodiment, the bottom wall of the groove 22 is sloped upward toward the tip, so that the fuel in the reservoir cup is absorbed by the inclination of the vehicle body or by the acceleration of the vehicle body when the introduction groove is installed. Even if the fuel is biased toward the opposite wall surface, it is possible to considerably prevent the fuel from flowing out of the reservoir cup 2 from the introduction groove 22.

Incidentally, by forming a protrusion 26 on a part of the bottom wall 24 of the introduction groove 22 as shown in FIG. 4, it is possible to further prevent the fuel from flowing backward from the fuel introduction groove 22.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the entire conventional device, Fig. 2 is a perspective view of the main parts of the conventional device, Fig. 3 is a sectional view showing the operating state of the conventional device, and Fig. 4 is an embodiment of the present invention. FIG. 2...Reservoir cup, 4...Fuel tank, 1
8...Fuel supply pipe, 22...Fuel introduction groove.

Claims (1)

[Scope of utility model registration request] In a fuel tank that is provided with a reservoir cup inside that surrounds the tip of a fuel supply pipe that supplies fuel to an engine, the side wall of the reservoir cup has a gutter-like cross-sectional shape that is open to the top surface, and the tip portion is approximately U-shaped. A fuel tank characterized in that a fuel introduction groove bent into a shape is welded and the groove communicates between the inside of the reservoir cup and the surrounding area of the reservoir cup so that fuel can flow.