JPH0340657Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial Application Field> This invention belongs to the field of structural technology for fuel sub-tanks provided in fuel tanks of automobiles, etc.

This invention relates to a fuel sub-tank that is installed inside a fuel tank and has a fuel absorption pipe facing it and a communication path connecting it to the fuel tank.
A partition wall is provided inside the casing, a communication path is formed by the partition wall and the inner wall of the casing, and the upper edge of the partition wall is formed to be inclined, and a notch is provided at the lower end side of the upper edge. This idea is related to a fuel sub-tank.

<Prior Art> Generally, a sub-tank is fixedly installed in the fuel tank of an automobile, etc., to prevent fuel supply from being cut off when turning or climbing.

As is well known, the conventional fuel sub-tank 1 shown in FIG. 4 has a tube 3 as a communication path communicating with the fuel tank in a container 2 as an upper open frame installed on the lower wall of the fuel tank (not shown). There was something attached to it.

<Problems to be solved by the invention> However, in the fuel sub-tank 1 based on the above-mentioned conventional technology, although the peripheral wall of the container 2 prevents the fuel from flowing out when subjected to lateral acceleration, the amount of fuel flowing out is Since the cross-sectional area of the tube 3 is relatively small, there is a drawback that only a certain amount of fuel can be replenished in a short period of time.

To deal with this, a dual structure embodiment disclosed in Japanese Utility Model Application Publication No. 56-69527 has been devised, but it has the disadvantage of complicating the structure and leading to increased costs.

The purpose of this invention is to solve the problems of the fuel sub-tank based on the above-mentioned conventional technology as a technical problem to be solved.
To make it difficult for fuel to flow out and easy to flow in,
The present invention aims to provide an excellent fuel sub-tank that is useful in the field of vehicle body applications in the vehicle industry.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of this invention, which is based on the above-mentioned claims for utility model registration, is to solve the above-mentioned problem. This is installed at the bottom of the fuel tank, and the fuel is sucked in by the fuel suction pipe from inside the upper opening frame body where the fuel liquid level is high. Since the upper edge of the partition wall provided inside the opening body is inclined, when the liquid level of the fuel is inclined in the direction along the upper edge of the partition wall, the lower edge of the upper edge of the partition wall Only a small amount of fuel flows out from the downward facing notch provided on the side, whereas if the fuel is tilted in a direction that crosses the upper edge of the partition wall, the fuel will not overflow the partition wall. When the fuel flowing in from the above-mentioned communication passage overflows the partition plate again, the upper extension of the partition plate is slanted, so that a large amount of fuel can flow in. It is.

<Example> Next, an example of this invention will be described below based on the drawings.

What is shown in Figures 1 and 2 is a fuel sub-tank 1' that forms the gist of this invention.
A fuel suction pipe 5 is exposed inside a casing 2', which serves as an upper open frame body installed in the casing 2'.

A partition wall 6 is provided inside the casing 2', and a communication path 8 is formed between the partition wall 6 and the inner wall 7 of the casing 2', and the communication path 8 is bent to connect to the outside of the casing 2'. That is, an opening is formed within the fuel tank.

The partition wall 6 has an upper edge inclined toward the inside of the casing 2', and a downward cutout 9 is provided at the lower end thereof.

Note that the portion of the communicating path 8 corresponding to the inclined portion of the partition wall 6 is formed to have a narrower width than other portions.

As shown in FIG. 3, the cutout 9 is smaller than the cross-sectional area of the conventional tube 3, and is designed so that the lower end of the upper edge of the partition wall 6 is at the level of the fuel level m at which the engine stalls. It's summery.

Therefore, when the fuel in the fuel tank becomes low and the vehicle turns, for example, the liquid level d intersects with the inclination direction of the partition wall 6, as shown by the chain line in FIG. In many cases, the liquid level is at e. Note that although the liquid level de originally has a parabolic shape, it is shown here as a straight line for convenience of illustration.

Here, when the fuel changes continuously from the liquid level d to the liquid level e in a short time, when the liquid level changes from the liquid level e to the liquid level d, the wall surface of the casing 2' Fuel leakage is prevented, while the liquid level d
When the liquid level changes from to liquid level e, fuel flows out from the partition wall 6 to the communicating passage 8, but the amount of fuel flowing out is small because the communicating passage 8 is narrow on the partition wall 6 side, and the amount of fuel flowing out is small compared to the conventional one. The outflow amount is equivalent to that of fuel subtank 1.

Furthermore, by changing alternately from the liquid level d to the liquid level e, when the liquid level is in the state of e, the partition wall 6
Since it is inclined, the fuel liquid level follows the upper edge of the partition wall 6, and the amount of outflow can be suppressed accordingly.

When the liquid level changes from state E to state C due to the notch, the amount of outflow decreases because the cross-sectional area of the notch 9 is smaller than that of the conventional tube 3, as described above.

On the other hand, contrary to the above, when the turning etc. are completed and the lateral acceleration etc. no longer act, the communication path 8
Since the part corresponding to the partition wall 6 is formed narrowly, the fuel flowing in becomes higher than the liquid level m above which causes an engine stall, and the overflow cross section flowing from the upper edge of the partition wall 6 is higher than that of the conventional tube cross section. As the size increases, the amount of fuel flowing in increases, and fuel can be supplied in a short time.

Therefore, the fuel in the fuel sub-tank 1' is difficult to flow out, the fuel flows in for a short time, and it is easy to flow in, so the time until the fuel runs out is extended compared to the conventional system. Ru.

<Other Embodiments> It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments, and various embodiments may be employed, such as making the extension of the partition wall parabolic along the liquid level of the fuel. can be adopted.

<Effects of the invention> According to this invention, basically, the structure is such that the outflow of fuel is extremely small and it is easy for fuel to flow in, so the time until fuel runs out is extended and the function as a fuel sub-tank is fully demonstrated. This is an excellent effect.

Further, a partition wall is provided inside the upper opening frame body,
Since a communication passage is formed between the partition wall and the inner wall of the upper opening frame body, fuel can flow in and out by overflowing the upper edge of the partition wall, so that the flow rate is lower than that of a pipe or the like. This provides an excellent effect of smooth inflow and outflow of fuel with less excessive resistance.

Furthermore, since the upper edge of the partition wall is formed to be inclined and a downward notch is provided on the lower end side of the upper edge, at least the liquid level of the fuel is inclined to the side along the inclination direction of the partition plate. At times, the fuel only flows out from the notch, so the amount of fuel flowing out is suppressed compared to the case where fuel flows out all the time.The amount of fuel flowing out from the upper notch is extremely small. In this case, the entire area above the upper edge of the partition wall is a part where fuel can flow in, so it is extremely easy for fuel to flow in, and this has the excellent effect of extending the time until the fuel runs out.

In addition, it has the advantage that it can be manufactured at low cost because of its simple structure.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of this invention, FIG. 2 is a sectional view of FIG. 1, FIG. 3 is an enlarged view of the portion in FIG. 2, and FIG. 4 is a perspective view of a conventional embodiment. 4... Bottom of fuel tank, 2'... Upper opening frame, 8... Communication path, 5... Pipe, 1'... Fuel sub-tank, 6... Partition wall, 7... Inner wall, 9...
Notch.

Claims (1)

[Scope of utility model registration request] In a fuel sub-tank, in which a communication path connecting the fuel tank and the inside of the upper opening frame installed at the bottom of the fuel tank is provided, and a fuel absorption pipe is faced, a partition is provided inside the upper opening frame. A wall is provided, a communication path is formed by the partition wall and the inner wall of the upper opening frame body, and the upper edge of the partition wall is formed to be inclined, and a downward notch is provided at the lower end side of the upper edge. A fuel sub-tank characterized by: