JPH0433133Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a fuel tank device for a vehicle.

(Prior art) Generally, a fuel tank device is as shown in Fig. 4.
A fuel tank 1, an inlet pipe 3 that connects the fuel filler port 2 and the fuel tank 1, a canister 4 whose one end opens into the upper space of the fuel tank 1 and which adsorbs evaporated fuel, and a two-way valve 5 that connects the other end. A ventilation passage 6 opens to the atmosphere, and a breather passage 8 opens at one end into the fuel tank 1 and defines a maximum filling level 7 of fuel.

(Problem to be solved by the invention) When refueling such a conventional fuel tank device,
Conventionally, fuel has been supplied by simply inserting the fuel gun 11 into the fuel filler port 2, which has resulted in a problem that evaporated fuel may diffuse into the atmosphere from the fuel filler port 2 during fuel supply. In order to eliminate such a problem, it is conceivable to provide a sealing material 12 in the fuel filler port 2, for example, to close the gap between the fuel filler port 2 and the fuel gun 11 when the fuel filler gun 11 is inserted.

However, when refueling is performed with the fuel filler port 2 sealed in this manner, the two-way valve 5 in the ventilation passage 6 is configured to open when the internal pressure of the fuel tank 1 exceeds a predetermined value. The air and evaporated fuel in the fuel tank 1 have no place to escape, so the fuel immediately reaches the upper end of the inlet pipe 3, which activates the auto stopper attached to the fuel gun 11, making it impossible to supply sufficient fuel. Causes problems.

The present invention has been devised to solve the above-mentioned problems, and the purpose of the present invention is to prevent the vaporized fuel from dispersing into the atmosphere during fuel supply, and to seal the fuel filler port side while fueling the fuel. It is an object of the present invention to provide a fuel tank device which allows smooth supply and which can be configured with a minimum number of parts.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides passages 21 communicating with the upper space of the fuel tank 1 and passages 25 communicating with the canister 23 at three locations in the inlet pipe near the filler cap 22. are placed in the inlet pipe 3, in conjunction with the removal of the filler cap 22, the passages 21,
25, and a valve 31 that shuts off both the passages 21 and 25 in conjunction with the tightening of the filler cap 22.

(Function) When fuel is supplied, the valve 31 is activated by removing the filler cap 22, the passages 21 and 25 are communicated through the communication passage 41 of the valve 31, and the air and evaporated fuel in the fuel tank 1 are transferred to the passage 21, 41 and 25, the vaporized fuel is adsorbed by the canister 23, and only clean air is released into the atmosphere.

After fuel is supplied, the valve 31 is activated by tightening the filler cap 22 to shut off the passages 21 and 25.
From now on, the air and evaporated fuel in the fuel tank 1 will be transferred to the passage 2.
1,25 does not flow.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of the fuel tank device according to the present invention, Fig. 2 is a cross-sectional side view of the valve part, and Fig. 3 is a schematic diagram of the fuel tank device according to the present invention.
The diagram shows a cross-sectional view of the same parts as the conventional device.
The same parts will be described with the same reference numerals.

One end has an opening 21a at approximately the same height as the highest filled liquid level 7 in the fuel tank 1, and the other end has a filler cap 2.
A passage 21 having an opening 21b in the inlet pipe 3 near the inlet pipe 2, and one end of which is connected to the inlet 2 of the canister 23.
4, and the other end of the passage 2 has an opening 25a in the inlet pipe 3 near the filler cap 22.
5 will be provided.

There is a filler cap 2 inside the inlet pipe 3.
A valve 31 is provided which rotates in conjunction with the opening 21b and 25a to cut off communication between the openings 21b and 25a.

The valve 31 has a cylindrical shape with O-rings 32, 32 fitted on the outer periphery on both sides of the openings 21b, 25a, and a hole 33 for inserting the refueling pipe portion 11a of the refueling gun 11 extending through the central portion. The cylindrical member 34 is provided with a flange 3 at the upper end of the inlet pipe 3.
5 and the brat 3 attached to the inlet pipe 3
6 for axial positioning, and the valve 31 and the upper end of the inlet pipe 3 form the oil supply port 2.

A notch 37 that engages with the locking piece 22a of the filler cap 22 is formed at the upper end of the cylindrical member 31, and when the locking valve 22a and the notch 37 engage, the cylindrical member moves in conjunction with the filler cap 22. 34 rotates.

Inside the cylindrical member 34, as shown in FIG.
1b and 25a, and filler cap 2
When tightening the oil filler port 2 of 2, the openings 21b, 2
A passage 41 is formed to block the passage 2.
1, 41, and 25 form a breather passage 42. Further, inside the cylindrical member 34, a passage 43 is formed which has an opening 43a on the lower surface of the cylindrical member 34 and is connected to the passage 41.

A seal member 44 is provided on the inner periphery of the hole 33 for elastically contacting the oil supply pipe portion 11a to seal the inside of the oil supply port 2 when the fuel gun is inserted.

A valve body 52 is provided on the lower surface of the cylindrical member 34 to constantly close the hole 33 with a torsion spring 51 or the like, and the valve body 52 has a protrusion 52a that closes the opening 43a via a seal member 53. Form.
When the refueling gun is inserted, the valve body 52 swings downward about the support shaft 54 by the refueling pipe portion 11a.

The canister 23 has two partition members 61,
The interior is defined by three spaces 63, 64, and 65 by 62, and the introduction port 24 is formed by an inner pot 66 etc. disposed in the space 63 at one end.
The intermediate space 64 is filled with activated carbon 67 to absorb evaporated fuel, and the space 65 at the other end has an opening 68 open to the atmosphere. and an inner pot 66 in the space at one end.
A passage 69 that connects to the engine side, for example, the inlet manifold, is opened on the outside.

In the drawings, reference numeral 71 indicates a sealing member attached to the filler cap 22.

Since the present embodiment is configured as described above, when the fuel gun 11 is inserted into the fuel filler port 2 and fuel is supplied while sealing the fuel filler port 2 through the seal member 44, the opening 21b is opened when the filler cap 22 is removed. ，
25a is connected through the passage 41, and since the opening 43a is opened by inserting the refueling gun 11, the air and vaporized fuel in the fuel tank 1 pass through the passages 21, 41, 25, and the inlet pipe. The air and evaporated fuel in 3 are passed through passages 43, 41, 2.
5 to the inlet 24, the evaporated fuel is absorbed by the activated carbon 67, and only clean air is released to the atmosphere through the opening 68.

Eventually, the fuel liquid level reaches above the passage opening 21a,
The fuel level 75 rises in the passage 21 and at the tip of the fuel gun 11, actuating the auto stopper of the fuel gun 11, ending fuel supply, and moving the fuel gun 11 to the fuel fill port 2.
By pulling out the filler cap 22, the hole 33 and the opening 43a are closed by the valve body 52, and by tightening the filler cap 22, the valve 31 is rotated and the passages 21, 2 are closed.
5 is blocked.

Similar to the evaporative fuel stored in the canister 4 of the ventilation passage 6, the evaporated fuel stored in the canister 23 of the breather passage 42 is passed through the passage 69 together with the atmospheric air sucked in from the opening 68 by the negative pressure on the engine side. and is sent to the engine side.

Therefore, according to this embodiment, fuel can be supplied smoothly while sealing the fuel filler port 2 side, and the valve 31 for disconnecting communication between the upper space inside the fuel tank 1 and the canister 23 can be replaced with the existing filler cap. Since the valve 31 is operated using the valve 22, no energy such as electricity or negative pressure is required, and the valve 31 can be operated reliably, and the device can be configured with a minimum number of parts, thereby reducing costs. I can do it.

Further, the cylindrical member 34 and the valve body 52 can also be used as a device for preventing leaded gasoline from being injected into an unleaded gasoline vehicle.

(Effect of the invention) As is clear from the above explanation, according to the invention,
In the vicinity of the filler cap, at the inlet pipe location where a passage communicating with the upper space of the fuel tank and a passage communicating with the canister are located, there is provided a communication passage that communicates both passages in conjunction with the removal of the filler cap. A valve is provided that shuts off both passages when tightened, which prevents vaporized fuel from dispersing into the atmosphere during fuel supply.
Fuel can be supplied smoothly while the fuel filler port side is sealed, and the device can be configured with a minimum number of parts.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the fuel tank device according to the present invention, Figure 2 is a cross-sectional side view of the valve part, and Figure 3 is the
FIG. 4 is a schematic diagram of a conventional device. In the drawing, 1 is the fuel tank, 2 is the fuel filler port, 3 is the inlet pipe, 6 is the ventilation passage, 2
1, 25, and 41 are passages, 22 is a filler cap, 23 is a canister, and 31 is a valve.

Claims (1)

[Scope of Claim for Utility Model Registration] A passage communicating with the upper space of the fuel tank and a passage communicating with the canister are located in an inlet pipe near the filler cap, respectively, and the inlet pipe is connected to the inlet pipe when the filler cap is removed. A fuel tank device comprising: a communication passage that communicates the two passages; and a valve that shuts off the two passages in conjunction with tightening of the filler cap.