JPH023029B2 - - Google Patents

Description

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

(Prior art) A fuel tank device generally has the following structure, as shown in Fig. 2.
A fuel tank 1, an inlet pipe 3 that connects the fuel filler port 2 and the fuel tank 1, and an activated carbon 4 that has one end opened in the above-mentioned space of the fuel tank 1 and that adsorbs evaporated fuel.
a ventilation passage 6 whose other end opens to the atmosphere via the canister 4 filled with fuel and a two-way valve 5; and a breather passage whose one end opens into the fuel tank 1 and defines the highest fuel filling level 7. 8.

(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. occurs.

The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to prevent the diffusion of evaporated fuel into the atmosphere during fuel supply;
Another object of the present invention is to provide a fuel tank device that can smoothly supply fuel while sealing the fuel filler port side.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a ventilator having one end opened to the upper space of the fuel tank and the other end opened to the atmosphere via a valve and a canister for adsorbing evaporated fuel. In a fuel tank device equipped with a breather passage and a breather passage whose one end opens into the fuel tank and defines the maximum filling level of fuel, the fuel supply port of the fuel supply pipe that supplies fuel to the fuel tank is connected to the fuel supply port. The present invention is characterized in that a sealing member is provided to close a gap with the fuel supply device, a valve that opens when fuel is supplied is provided in the breather passage, and the other end of the breather passage is connected between the canister and the ventilation passage.

(Function) When fuel is supplied, the valve of the breather passage opens, and as fuel is supplied, the air and evaporated fuel in the fuel tank pass through the breather passage and the ventilation passage, and the evaporated fuel is adsorbed by the canister, leaving only clean air. released into the atmosphere.

After the fuel is supplied, the valve of the breather passage is closed, and the air and evaporated fuel in the fuel tank no longer flow from the breather passage to the ventilation passage.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic diagram of a fuel tank device according to the present invention, in which the same parts and parts as those in the conventional device are denoted by the same reference numerals. 21 and a breather passage 22 is provided. The breather passage 22 includes a passage 24 connecting the opening 21 and openings 23 provided at two oil filler ports inside the sealing material 12;
A passage 27 is provided at an upper portion of the ventilation passage 6, with one end opening 25 and the other end opening 26 between the two-way valve 5 and the canister 4 in the ventilation passage 6. The opening 25 is provided above the highest liquid level 28 in the passage 24 during fuel supply.

The passage 27 is provided with a valve 31 that opens when fuel is supplied. This valve 31 is, for example, a solenoid valve that opens via a switch 33 when the lid 32 of the fuel filler port 2 is opened and closes when it is closed.

A relief valve 34 is provided upstream of the solenoid valve 31 in the passage 27. Relief valve 34
is activated when the solenoid valve 31 does not open when the lid 32 is opened.

In addition, 41 in the drawing is a passage connected to the engine side, for example, the inlet manifold, and when the engine is running,
Opening 4 of canister 4 due to negative pressure on the engine side.
Atmospheric air is sucked in from the canister 2, and evaporated fuel stored in the canister 4 is delivered to the engine side.

Since this embodiment is configured as described above, when the fuel gun (fuel supply device) 11 is inserted into the fuel filler port 2, the fuel filler port 2 is sealed, and fuel is supplied, the solenoid is already activated when the lid 32 is opened. Since the valve 31 is open, the air and evaporated fuel in the fuel tank 1 and inlet pipe 3 smoothly flow into the passage 2 as fuel is supplied.
4, 27 reaches the canister 4 through ventilation passages, the evaporated fuel is absorbed by the activated carbon 4a, and only clean air is released to the atmosphere from the opening 42.

Eventually, the fuel level reaches above the passage opening 21, and the fuel level 28 rises at the passage 24 and the tip of the fueling gun 11, which activates the auto stopper of the fueling gun 11, ending fuel supply, and closing the lid of the fueling port 2. 32 closes the solenoid valve 31.

Incidentally, the fuel tank device according to the present invention can be applied to the conventional fuel tank device having a ventilation passage 6 and a breather passage 8 only by adding a passage 27, a valve 31, etc., and therefore can be applied to the conventional fuel tank device very easily. Can be done.

(Effect of the invention) As is clear from the above explanation, according to the present invention,
Diffusion of evaporated fuel into the atmosphere during fuel supply can be prevented, and fuel can be supplied smoothly by making the inside of the fuel tank communicate with the canister while sealing the fuel filler port side.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the present device, and FIG. 2 is a schematic diagram of a conventional device. In the drawing, 1 is a fuel tank, 2 is a fuel filler port, 3 is an inlet pipe, 4 is a canister, 6 is a ventilation passage, 22 is a breather passage, and 31 is a valve.

Claims (1)

[Claims] 1. A ventilation passageway with one end opening into the upper space within the fuel tank and the other end opening into the atmosphere via a valve and a canister that adsorbs evaporated fuel; and one end opening into the fuel tank. a breather passage that defines a maximum filling level of fuel, the fuel tank device comprising: a breather passage that defines a maximum filling level of fuel; a seal that closes a gap between the fuel filler port and the fuel supply device; A fuel tank device, comprising: a member provided in the breather passage; a valve that opens when fuel is supplied; and the other end of the breather passage is connected between the valve in the ventilation passage and the canister. 2. The fuel tank device according to claim 1, wherein the valve provided in the breather passage opens and closes in conjunction with the lid of the fuel filler port.