JPH05162546A - Fuel tank for vehicle - Google Patents

Abstract

PURPOSE:To provide a fuel tank for a vehicle capable of opening a communica tion passage with a canister at the time of opening a fuel cap, in a simple structure, and of improving reliability for leading fuel vapor to the canister. CONSTITUTION:At an upper part of a tank main body a fuel pouring-in pipe 2 provided with a communication passage with a canister is arranged, while at an upper part of the pipe 2, a fuel cap 12 is disposed. At the inside of the pipe 2 a first magnetic body is arranged while, at the outside of the pipe 2, a second magnetic member 14 abutting against the cap 12 to enable it to move freely and repelling or attracting the first magnetic member is disposed. The magnetic member is provided with a valve part 6b which closes or opens the communication passage 3 by the repulsion or attraction of the magnetic member 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank for vehicles such as automobiles, and more particularly to a fuel tank for vehicles capable of preventing fuel vapor from flowing into the atmosphere during refueling.

[0002]

2. Description of the Related Art Conventionally, in this type of fuel tank, when the amount of fuel in the tank becomes small, a space above the liquid surface of the fuel is filled with a large amount of fuel vapor.

Therefore, in the conventional fuel tank, when the fuel cap is opened so that the fuel vapor does not flow into the atmosphere during refueling, a communication passage communicating with the canister is opened to guide the fuel vapor to the canister. In closing the fuel cap, the communication flow path leading to the canister is closed.

In the conventional fuel tank, an opening / closing control valve for mechanically opening / closing a fuel spring in the fuel injection pipe is used as a mechanism for opening a communication passage communicating with the canister when the fuel cap is opened. Was provided (see Japanese Patent Laid-Open No. 60-199729).

However, this on-off control valve is constructed so as to move directly in contact with the fuel cap in the fuel injection pipe, and a sealing portion for isolating the atmosphere from the inside of the tank is required around the fuel cap. However, even if such a valve is provided, the reliability such as the life of the seal portion with respect to the moving opening / closing control valve is lacking.

The present invention solves the above-mentioned problems, and it is possible to open the communication passage to the canister when opening the fuel cap with a simple structure, and to improve the reliability of guiding the fuel vapor to the canister. An object is to provide a vehicle fuel tank that can be improved.

[0007]

In a fuel tank for a vehicle according to the present invention, a fuel injection pipe having a communication passage communicating with a canister is arranged in an upper portion of a tank body, and the fuel injection pipe is provided in an upper portion of the fuel injection pipe. A fuel tank for a vehicle in which a fuel cap is provided, the communication passage is opened when the fuel cap is opened, and the communication passage is closed when the fuel cap is closed. A first magnetic body disposed on the inner side of the fuel injection pipe and a first magnetic body disposed on the outer side of the fuel injection pipe are brought into contact with the fuel cap so as to be movable and repel or adsorb the first magnetic body. A second magnetic body, wherein the first magnetic body is provided with a valve portion that closes and opens the communication flow path by movement due to repulsion or adsorption with the second magnetic body. And

[0008]

In the vehicle fuel tank according to the present invention, the second magnetic body moves when the fuel cap is opened, and the first magnetic body that repels or adsorbs the second magnetic body is The magnetic body moves along with the movement of the magnetic body, and the valve portion opens the communication passage. Therefore, the tank body and the canister are communicated with each other, and the fuel vapor in the tank body is guided to the canister.

Further, when the fuel cap is closed, the first magnetic body moves in the opposite direction, and the valve portion closes the communication passage.

The first magnetic body is arranged inside the fuel injection pipe, the second magnetic body is arranged outside the fuel injection pipe, and the first and second magnetic bodies are arranged inside the fuel injection pipe. Since the structure is completely isolated from the inside and the outside, it is not necessary to have a sealing property against fuel vapor in consideration of mutual movement.

Therefore, in the vehicle fuel tank according to the present invention, the mechanism for opening the communication passage is constructed by using two magnetic bodies that repel or attract each other, and can be manufactured at a low cost. , In the fuel injection pipe,
Unlike the on-off control valve that directly contacts the fuel cap, it is not necessary to consider the sealing property against the fuel vapor, so the reliability of guiding the fuel vapor to the canister when opening the fuel cap can be improved. ..

[0012]

Embodiments of the present invention will be described below.

A vehicle fuel tank T of the embodiment is shown in FIGS.
As shown in FIG. 2, the fuel injection pipe 2 is arranged on the upper part of the tank body 1, and the fuel injection port 11 is arranged on the upper part of the fuel injection pipe 2. The fuel cap 1 is attached to the fuel inlet 11.
2 will be attached.

The fuel injection pipe 2 of the embodiment is made of a non-magnetic synthetic resin and is divided into an upper portion 2A and a lower portion 2B. The lower fuel injection pipe 2B has an upper portion and an upper fuel portion of the tank body 1. Breeze tube 21 for communicating with the injection tube 2A
Are arranged.

The upper fuel injection pipe 2A is provided on its side surface with a communication passage 3 which is connected to the canister C, and the portion of the communication passage 3 and the canister C are connected by a connection pipe 20.

Inside the upper fuel injection pipe 2A,
A through hole 8a into which the fuel injection nozzle N can be inserted and an through hole 5 that communicates with a valve chamber 4 described later are provided in an opening portion of the communication passage 3.
And an intermediate wall portion 8 made of synthetic resin, which includes Reference numeral 9 is a trap door provided with a positive pressure valve (not shown) and opened when the fuel injection nozzle N is inserted, and 10 is the inserted fuel injection nozzle N and the through hole 8a.
Is a nozzle seal that seals the inner peripheral surface of the nozzle.

The valve chamber 4 is formed above the through hole 5 at the periphery of the opening portion of the communication passage 3, and is constituted by the intermediate wall portion 8 and the wall portion of the upper fuel injection pipe 2A. Inside the valve chamber 4, a first magnetic body 6 and a spring seat 80 for the coil spring 7 that biases the first magnetic body 6 upward are arranged.

The spring seat 80 is made of a non-magnetic synthetic resin and has a partition wall 8 having a through hole 80b in an intermediate portion in the vertical direction.
0a, and upper and lower wall portions 80c and 80d that extend vertically from the peripheral edge of the partition wall 80a and contact the wall portion of the upper fuel injection pipe 2A and the intermediate wall portion 8 respectively.

The first magnetic body 6 has a through hole 80 in the spring seat 80.
It is arranged so as to pass through b in the vertical direction, and at the upper end, the first
A permanent magnet 6a is arranged, and a valve portion 6b capable of closing the through hole 5 is arranged at the lower end on the through hole 5 side. Valve part 6b
Is sandwiched between the holding plates 6d and 6e, and the through hole 5
6c made of rubber-like elastic material for sealing the periphery of the
Is equipped with. The first magnetic body 6 is constantly urged upward by bringing the upper end of the coil spring 7 whose lower end is held by the partition wall 80a of the spring seat 80 into contact with the upper flange portion 6f.

A substantially cylindrical storage cylinder 13 made of a non-magnetic synthetic resin is fixed above the valve chamber 4 outside the upper fuel injection pipe 2A. A magnetic body 14 is arranged.

The storage cylinder 13 includes an upper wall 13a and an upper wall 13a.
And a peripheral wall 13c extending downward from the peripheral edge of the peripheral wall 13c. The upper wall 13a is formed with a through-hole 13b of "horizontal T shape" when viewed from above, and the peripheral wall 13c is
A plurality of vertical slits 13d are formed.

The second magnetic body 14 has a second permanent magnet 14a that repels the first permanent magnet 6a disposed at the lower end on the valve chamber 4 side, and has a through hole 1 in the upper wall 13a of the storage cylinder 13 at the upper end.
A pressing portion 14b is formed which protrudes upward from 3b and is capable of contacting the flange portion 12a of the fuel cap 12 screwed to the fuel inlet 11. Further, the second magnetic body 14 is provided with a horizontal rod 14c which horizontally projects from each slit 13d of the storage cylinder 13 at an intermediate portion in the vertical direction. The second magnetic body 14 is constantly urged upward by bringing the lower end of the coil spring 15 whose lower end is in contact with the outer surface of the upper fuel injection pipe 2A into contact with the lower surface of the horizontal rod 14c. There is.

Next, the operation mode of the fuel tank T of the embodiment will be described. First, when the fuel cap 12 is closed, as shown in FIG. 2, the pressing portion 14b of the second magnetic body 14 is pressed. Is pushed by the flange portion 12a of the fuel cap 12, and resists the biasing force of the coil spring 15 so that the second permanent magnet 14a of the second magnetic body 14 approaches the first permanent magnet 6a of the first magnetic body 6. Will be made.

Then, since the first permanent magnet 6a repels the second permanent magnet 14a, the repulsive force of both resists the urging force of the coil spring 7 and causes the first magnetic body 6 to move.
Move to the side. As a result, the valve portion 6b of the first magnetic body 6 is
Since the seal portion 6c is brought into contact with the peripheral edge of the through hole 5 to close the through hole 5 of the valve chamber 4, the communication passage 3 communicating with the canister C is closed with the tank body 1.

At the time of refueling, the fuel cap 1
When 2 is removed, as shown in FIG. 1, the flange portion 12a of the fuel cap 12 is pushed to the pressing portion 1 of the second magnetic body 14.
4b, the downward pressing force of the pressing portion 14b is released, so that the second magnetic body 14 moves upward away from the valve chamber 4 by the biasing force of the coil spring 15. Then,
The repulsive force between the first and second permanent magnets 6a and 14a is weakened, and the first magnetic body 6 in the valve chamber 4 separates the valve portion 6b from the peripheral edge of the through hole 5 by the biasing force of the coil spring 7. .. As a result, since the through hole 5 of the valve chamber 4 is opened, the tank body 1 and the canister C are communicated with each other via the communication flow path 3 and the through hole 5, and the fuel vapor V in the tank body 1 is transferred to the canister C. Will be led to.

Then, as shown in FIG. 3, the fuel injection nozzle N may be inserted from the fuel injection port 11 to supply the liquid fuel L. A trap door 9 is disposed below the fuel inlet 11 until the fuel cap 12 is removed and the fuel inlet nozzle N is inserted into the fuel inlet 11. The trap door 9 allows the fuel vapor V to flow through the trap door 9. However, the trap door 9 is pushed and opened by the fuel injection nozzle N when the fuel injection nozzle N is inserted, but the nozzle seal 10 is provided inside the through hole 8a of the fuel injection nozzle N and the intermediate wall portion 8. Since the space between the fuel injection nozzle N and the peripheral surface is sealed, it is possible to prevent the fuel vapor V from flowing out into the atmosphere during and during the insertion of the fuel injection nozzle N. By the way, since the upper and lower fuel injection pipes 2A and 2B and the intermediate wall 8 are welded to each other to be in a sealed state, the fuel vapor V does not flow out to the atmosphere from these joints during refueling. ..

When refueling is completed, the fuel injection nozzle N is removed from the fuel injection port 11 and the fuel cap 12 is fastened to the fuel injection port 11 to obtain the state shown in FIG. Thus, the communication flow path 3 is closed.

Therefore, in the fuel tank T, the mechanism for opening the communication passage 3 for communicating the canister C and the tank body 1 has the first and second magnetic bodies using the two permanent magnets 6a and 14a. 6 and 14 are used, and can be manufactured at a low cost. Further, unlike the opening / closing control valve that directly contacts the fuel cap in the fuel injection pipe 2, the seal against the fuel vapor V is provided. Since it is not necessary to consider the property, it is possible to improve the reliability of guiding the fuel vapor V to the canister C when opening the fuel cap 12.

In the embodiment, the first and second magnetic bodies 6.1
Although the case where 4 repels each other is shown, they may be configured to be attracted to each other as shown in FIG.

That is, the coil spring 7 urges the first magnetic body 6 to move downward, and the valve portion 6b is penetrated with the first permanent magnet 6a arranged in the valve chamber 4. It is configured to project from the hole 5. In this case, when the second magnetic body 14 is close to the first magnetic body 6, the first magnetic body 6 resists the urging force of the coil spring 7 and moves upward due to the mutual attraction force. When the second magnetic body 14 is separated from the first magnetic body 6, the mutual attraction force is increased. It weakens, the first magnetic body 6 moves downward by the biasing force of the coil spring 7, and the through hole 5 is opened.

Then, as described above, the first and second magnetic members 6
If the 14 are configured to stick to each other, the first
The two permanent magnets 6a and 14a of the two magnetic bodies 6 and 14 can be eliminated and replaced with a magnetic material such as iron.

In the embodiment, the moving direction of the first magnetic body 6 is the same as the moving direction of the second magnetic body 14 in the vertical direction, but the repulsion of the first and second magnetic bodies 6 and 14 or It is also possible to arrange the moving direction of the first magnetic body 6 in the horizontal direction by making the opening portions of the communication channels 3 correspond to each other by using adsorption.

[Brief description of drawings]

FIG. 1 is a sectional view of a fuel tank showing an embodiment of the present invention, showing a state in which a fuel cap is opened.

FIG. 2 is a sectional view of the embodiment, showing a state in which the fuel cap is closed.

FIG. 3 is a cross-sectional view of the same embodiment, showing a state during refueling.

FIG. 4 is a diagram showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tank main body, 2 ... Fuel injection pipe, 3 ... Communication flow path, 6 ... 1st magnetic body, 6a ... Magnetic body (permanent magnet), 6b ... Valve part, 11 ... Fuel injection port, 12 ... Fuel cap, 14 ... 2nd magnetic body, 14a ... Magnetic body (permanent magnet), T ... (for vehicle) fuel tank, C ... Canister, V ... Fuel vapor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisao Ei, Nagachibata, Ochiai, Kasuga-cho, Nishikasugai-gun, Aichi Prefecture, Toyoda Gosei Co., Ltd. Inside the Fujisawa factory

Claims (1)

[Claims] 1. A fuel injection pipe having a communication passage communicating with a canister is arranged on an upper part of a tank body, and a fuel cap is arranged on an upper part of the fuel injection pipe. A fuel tank for a vehicle, which opens the communication passage when opening a fuel tank and closes the communication passage when closing the fuel cap, wherein the first magnetic member disposed inside the fuel injection pipe is provided. A first magnetic body, and a second magnetic body that is disposed outside the fuel injection pipe and abuts against the fuel cap so as to be movable and that repels or adsorbs the first magnetic body. However, the vehicle fuel tank is provided with a valve portion that closes and opens the communication flow path by movement due to repulsion or adsorption with the second magnetic body.