JPS633294Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a fuel tank for an automobile.

One example of a conventional fuel tank of this type is shown in FIG. 1, and another example is shown in FIG. In the one shown in FIG. 1, a buff-full plate 3 is placed on the convex portion 1a of the upper surface of the tank to form an air chamber 4, and the air inside the air chamber 4 is guided to the outside of the tank by a breather tube 2. The one in Figure 2 is the same as above, but
The difference is that the buff-full plate 3 forms an inclined surface and that it has a communication pipe 7.

However, the above method has the following drawbacks.

(1) If liquid enters the air chamber 4 when the vehicle turns, etc., but there is a disadvantage that the liquid shakes due to the vibration of the car body and scatters at the mouth 2b of the breather tube 2, and the pressure inside the air chamber increases. Liquid flows out from the breather tube 2 to the outside.

(2) Since the breather tube 2 is piped outside the top surface of the tank, it has the drawback of reducing valuable space such as trunk space and rear seat comfort in general passenger cars.

(3) There is a port 6 on the bottom surface of the buffer plate 3, which has the disadvantage that liquid easily enters the air chamber 4 due to fluctuations in the liquid level in the tank, expansion of the liquid, etc.

The purpose of the present invention is to provide a fuel tank that eliminates the above-mentioned drawbacks, and is characterized by a part of the top surface of the tank protruding outward, an end surface, and a slope extending outward from the end surface. A convex part, opposite to the convex part, protrudes inward from the top surface of the tank, extends outward from the same end face, and has an outer peripheral edge with a slope having a larger diameter than the slope of the convex part, and the same end face An air chamber consisting of a buttful plate raised above the liquid level when the tank is full, the above-mentioned convex part and the buttful plate, and an air chamber that is inserted into the air chamber from the inside of the top surface of the tank and formed in a U-shape along the end face of the above-mentioned convex part. This device includes a breather tube with an opening, a port provided on the end face of the buff-full plate, and a louver attached to the port.

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 3 is a sectional view showing a fuel tank according to an embodiment of the present invention, Fig. 4 is a top view showing the air chamber of Fig. 3, Fig. 5 is a sectional view taken along the line X-X in Fig. 4, and Fig. 6 5 is a sectional view taken along the YY arrow in FIG. 5. FIG.

In the figure, 1 is a fuel tank, and 1a is a convex part of the fuel tank 1. A part of the upper surface of the tank 1 protrudes outward and is composed of a circular end surface and a slope 1b that extends gently toward the end from the end surface. has been done.

Reference numeral 3 denotes a buttful plate, which is provided opposite to the convex portion 1a and protrudes inward from the upper surface of the tank 1, and has a circular end face and a slope 3 that extends gently toward the end from the same end face.
The outer peripheral edge of the slope 3a is formed to have a larger diameter than the outer peripheral edge of the slope 1b of the convex portion, and a step C is provided.

Reference numeral 4 denotes an air chamber, which is composed of a convex portion 1a and a buff-full plate 3.

2 is a breather tube, which is piped inside the upper surface of the tank 1 and inserted into the air chamber 4 to form a U-shaped portion 2a along the end surface of the convex portion 1a, and an opening 2b is provided at the end thereof. . It is preferable that the opening 2b opens outside the left and right inclined liquid levels B, B caused by left and right turning, that is, in the upper center as shown in the figure.

The end face of the full plate 3 is located at a predetermined height A higher than the liquid level when the tank is full, and a port 6 is opened on the end face, and a louver 5 is attached, and the direction of the louver 5 is The opening 2b of the breather tube is provided in such a direction that the inflow liquid from the port 6 does not directly splash into the opening 2b of the breather tube.

The functions and effects of the above configuration will be described.

This prevents liquid from flowing out of the breather tube 2 due to splashing of the liquid to the breather tube opening 2b and an increase in pressure due to temperature rise during operation.

(1) By selecting the position of the port 6 and setting the louver 5, it is possible to prevent the agitating liquid from directly scattering to the breather tube opening 2b. Also, it is difficult for liquid to enter the air chamber 4.

(2) Liquid enters the air chamber 4 due to the inclined liquid level B due to rapid turning, sudden acceleration and deceleration, etc., but even if the liquid swings, it is attenuated by the surrounding gentle slopes and is unlikely to scatter. In addition, even if it scatters, the step C
This has the effect of preventing scattering to the breather tube opening 2b.

(3) Since the breather tube 2 is U-shaped, even if the liquid splashes into the breather tube opening 2b, it is difficult to flow out.

(4) Since the breather tube 2 is piped inside the top surface of the tank, a compact structure can be obtained in a general passenger car without interfering with the trunk space above the tank or the comfort of the rear seats.

(5) Breather with the height A of the full plate from the liquid level when the tank is full, and the inclined liquid level B due to sudden turns, etc. (this also includes the liquid level inclined forward and backward due to acceleration and deceleration) A sufficient breather effect (liquid does not flow out) can be easily obtained by selecting the tube opening position.

(6) By simply providing one buttful plate 3 inside the tank, an inexpensive breather structure with high productivity can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one example of a conventional fuel tank, FIG. 2 is a sectional view showing another example of a conventional fuel tank, FIG. 3 is a sectional view showing an example of a fuel tank according to the present invention, and FIG. The figure is a top view showing the air chamber in Figure 3, and Figure 5 is a top view of the air chamber in Figure 4.
6 is a sectional view taken along the line Y--Y in FIG. 5. 1...Huel tank, 1a...Protrusion, 1b,
3a...slope, 2...breather tube, 3...
Batsuful plate, 4...Eyachiyamba, 5...
Louver, 6...port.

Claims (1)

[Scope of utility model registration request] A convex part that protrudes a part of the top surface of the tank outward and is made up of an end face and a slope extending outward from the same end face. An air chamber consisting of a buttful plate that extends outward and has a slope whose outer peripheral edge has a larger diameter than the slope of the convex part, and has the same end surface higher than the liquid level when the tank is full; and an air chamber made of the convex part and the buttful plate. , a breather tube inserted into the air chamber from the inside of the top surface of the tank and formed in a U-shape along the end surface of the convex portion with an opening at the end; This tank is characterized by having a louver.