JPS6340333Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for promoting fuel injection into a fuel tank of an automobile.

Generally, automobile fuel tanks are equipped with a breather pipe to remove air from inside the fuel tank, but if the oil level in a particularly large fuel tank gets close to the fuel tank ceiling, the air inside the fuel tank will be difficult to evacuate, causing the fuel to evacuate. The injection time was long. Therefore,
Conventionally, attempts have been made to overcome this drawback by increasing the diameter of the breather pipe or by providing a large number of breather pipes, but this has not been possible due to the design of some vehicle models.

SUMMARY OF THE INVENTION In view of this, an object of the present invention is to provide a fuel injection promoting device for a fuel tank that promotes fuel injection by quickly removing air from the breather pipe.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the present invention, in which an injection pipe 2 and a breather pipe 3 are provided above a fuel tank 1.
It is provided with one end 3a open. In the injection tube 2 provided in the injection part, there is provided a double tube consisting of an inner tube 4 and an outer tube 5 whose upper ends 4a and 5a are connected, and the upper ends 4a and 5a of the inner tube 4 and the outer tube 5 are connected to the injection tube. 2, and the upper end of the inner tube 4 is open. The diameter of the lower end 4b of the inner tube 4 is gradually reduced, and the diameter of the lower end 5b of the outer tube 5 is similarly gradually reduced, and the outer tube 5 is further extended beyond the position where the lower end 4b of the inner tube 4 ends. Let's call it tube 6. Then, the other end 3b of the breather pipe 3 is connected to the outer pipe 5,
Open your mouth. Note that 7 is a buff-full plate and 8 is an insertion nozzle.

When putting fuel into the fuel tank 1, the insertion nozzle 8 is inserted into the opening at the upper end 4a of the inner tube 4, and the fuel is injected. The fuel passes through the inner tube 4 and reaches the lower end 4a.
The fuel flows from the fuel tank 1 through the guide pipe 6 into the fuel tank 1 .
Then, the lower end 5b of the outer pipe 5, which is open to the fuel flow surface, has a lower pressure due to the bench lily effect, and the other end 3b of the breather pipe 3, which opens near the lower end 5b, has a lower pressure than the one end 3a. becomes lower, the air in the fuel tank 1 is forcibly sucked through one end 3a of the breather pipe 3, and is discharged from the guide pipe 6 along with the fuel, and then only the air is discharged from between the injection pipe 2 and the outer pipe 5. .

FIG. 2 shows another embodiment of the present invention, in which the fuel tank 9 consists of two chambers 9a, 9b;
b are connected by a connecting pipe 10. One room 9a
A fuel injection pipe 2 is provided in the other chamber 9b, and one end 3a of a breather pipe 3 is provided in the other chamber 9b with openings, respectively.The injection pipe 2 is provided with a double pipe similar to the first embodiment.

FIG. 3 shows still another embodiment of the present invention, in which two chambers 9a and 9b of the fuel tank 9 each have:
The breather pipe is provided with one ends 3a and 3c open. The injection tube 11 of the injection section of this embodiment has the same shape as the double-tube outer tube 5 of the previous embodiment. That is, the diameter of the injection tube 11 is gradually narrowed downward, and the injection tube 1 is closed at the position where the lower end 4b of the inner tube 4 ends.
The diameter of 1 is extended as it is. In the injection pipe 11 near the lower end 4b of the inner pipe 4,
The other end 3b of the breather pipe 3 is open.

In this way, the present invention provides a double pipe consisting of an inner pipe and an outer pipe at the injection part of the fuel tank, and the diameter of the lower end of the inner pipe is gradually reduced, so that the speed of the fuel injected is reduced in this part. The pressure near the bottom end of the outer pipe, which is in contact with the fuel flowing down at a high speed, becomes low, so the air in the breather pipe, which opens near the bottom end of the inner pipe, is forcibly sucked into the fuel tank. Fuel can be injected quickly even when the surface has risen significantly.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a side sectional view of another embodiment of the present invention, and FIG. 3 is a side sectional view of an embodiment of the present invention.
FIG. 6 is a side cross-sectional view of still another embodiment of the present invention; 1, 9... fuel tank, 2, 11... injection pipe,
3...Breather pipe, 4...Inner pipe, 5...Outer pipe, 6...Guide pipe, 7...Bullet plate, 8
...Insertion nozzle, 10...Connection pipe.

Claims (1)

[Scope of utility model registration request] A double pipe consisting of an inner pipe and an outer pipe is provided at the injection part of the fuel tank, the lower end of the inner pipe has a reduced diameter, and the outer pipe near the lower end of the inner pipe has one end inserted into the fuel tank. A fuel injection promoting device for a fuel tank, characterized in that the other end of a breather pipe is opened.