JPH0439060Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an automobile fuel tank that can cope with freezing of water.

(Prior Art) Conventionally, a fuel suction device in a fuel tank for an automobile usually has a single pipe. In addition, automobile fuel, especially diesel oil, has a low freezing limit at low temperatures, so diesel oil with different connection temperatures depending on the season is used, but since it is possible for water etc. to get inside the fuel tank, it is difficult to freeze the fuel. It is not enough to limit the temperature. Therefore, it has been proposed to install a fuel intake pipe adjacent to the return pipe from the engine side to constantly utilize high-temperature fuel, but in this case, the output of the engine would actually decrease in the summer. On the other hand, if the fuel suction pipe is provided at a remote location, there is a drawback that water in the fuel freezes in winter, causing the pipe to close.

(Problems to be solved by the invention) This invention improves the above-mentioned drawbacks of the conventional ones.The fuel intake pipe becomes blocked due to contaminants or water in the fuel freezes, resulting in a reduction in engine output and engine stoppage. The aim is to be able to deal with it.

(Means for solving the problem) In addition to the main fuel intake pipe, open an auxiliary fuel intake pipe in the bathtub inside the fuel tank adjacent to the return pipe, and connect this pipe and the main fuel intake pipe to the main fuel intake pipe. It is connected by a one-way valve that allows flow only towards the

(Function) As configured as above, if the main fuel suction pipe is blocked due to freezing of moisture in the fuel at low temperatures or due to foreign matter, the inside of the main fuel pipe becomes negative pressure, and the secondary fuel Since fuel can flow into the main fuel intake pipe from the auxiliary fuel intake pipe via the one-way valve connected to the intake pipe, it is possible to prevent the engine from decreasing in output or stopping. Particularly in winter, heated fuel from the return pipe can be used, which is effective against blockages caused by freezing.

(Example) This invention will be further explained with reference to an example shown in the drawings. 1 is a fuel tank body, and 2 and 3 are a main fuel suction pipe and an auxiliary fuel suction pipe, respectively. Further, 4 is a fuel return pipe, 5 is a bathtub, which is a container for temporarily storing the fuel from the return pipe 4, and 6 is a main fuel intake port whose tip portion is partially squeezed 13. 7 is a breather line, 8 is a one-way valve that opens only towards the main fuel intake pipe 2;
The main fuel suction pipe 2 and the auxiliary fuel suction pipe 3 are connected via. E indicates the engine, and the arrows attached to it indicate the flow of fuel back from the engine and the flow of fuel toward the engine. The same applies to the arrows in FIG. Reference numeral 11 in FIG. 3 is a valve membrane, and when the main fuel suction pipe 2 is blocked and the pressure becomes negative, the valve membrane 11 opens and the valve port 9 connected to the auxiliary fuel suction pipe is opened.
More fuel flows in the direction of the arrow, and the main fuel intake pipe 2
Instead, fuel flows toward the engine through this flow path. The embodiment of this invention is constructed as described above, so if the main fuel intake pipe is blocked due to freezing or the like, the fuel pump will continue to draw fuel into the engine, so negative pressure will not occur inside the pipe. Accordingly, the one-way valve 8 connected to the auxiliary fuel intake pipe 3 opens, and fuel flows from the auxiliary fuel absorption pipe 3 toward the engine as described above. At this time, the intake port of the auxiliary fuel pipe 3 is
Since it is installed in the bathtub 5 adjacent to the return pipe, the return fuel, which is high temperature fuel, can be used effectively when it freezes. In addition, by narrowing the opening of the main fuel intake pipe 2, the fuel tank 1
This prevents contaminants, ice chips, etc. from entering the container.

(Effect of the invention) As mentioned above, even if the main fuel pipe is closed due to defects or foreign matter during freezing, the relatively high temperature fuel that returns from the return pipe is supplied from the auxiliary fuel intake pipe, and the main fuel intake pipe This has the excellent effect of eliminating freezing of the engine and enabling constant engine operation at all times.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of an embodiment of the fuel tank;
The figure shows a cross-sectional plan view, FIG. 3 shows an enlarged view of the connecting valve, and FIG. 4 shows the opening of the main fuel intake pipe. 1...Fuel tank, 2...Main fuel intake pipe,
3...Auxiliary fuel intake pipe, 4...Return pipe, 5...Bathtub, 6...Main fuel intake port, 7...
...breather line, 8...valve.

Claims (1)

[Scope of utility model registration request] A secondary fuel suction pipe is provided adjacent to the return pipe and opens into the bathtub where the return pipe opens, and the secondary fuel suction pipe and the main fuel suction pipe that opens at other positions in the tank are connected in the direction of the main fuel suction pipe. A fuel tank connected by a one-way valve that allows only flow.