JPH04353022A - Oil feeding part structure of fuel tank - Google Patents

Abstract

PURPOSE:To let a relief valve function which removes fuel oil when the pressure in a filler tube is excessively high at the time of fuel feeding, and let the positive valve of a filler cap function at the time of closing the filler cap in a fuel tank. CONSTITUTION:A valve unit 15 is fixed in a filler tube 2, where an insertion passage 14 of the nozzle 7a of an oil feeding gun 7, a relief passage 15 of a relief valve 11 and an insertion hole 17 of a link member 18 are provided. The link member 18 in the insertion hole 17 is pressed against a filler cap 12 at the time of closing the filler cap 12 to press open a shutter 9 which closes the insertion passage 14, and when the filler cap 12 is removed, it is protrudingly-released to permit the shutter 9 to close. At the filler cap 12, a positive pressure valve 21 and a negative pressure valve 23 are provided, and at the time of closing the filler cap 12, the link member 18 opens the shutter 9 to make the pressure in a tank body 1 work upon the filler cap 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to the structure of a fuel supply section of a fuel tank.

0002

2. Description of the Related Art For example, some fuel tanks for vehicles include those shown in FIGS. 4 and 5.

In the figure, an evaporative tube 3 communicating with a canister 5 is connected to the upper wall of a tank body 1.
A vent tube 4 communicating with the atmosphere via a canister 6 is connected to the insertion portion 2a of the filler tube 2 attached to the tank body 1 for the refueling gun 7.

A sealing member 8 is provided on the inner peripheral surface of the insertion portion 2a of the fuel gun 7 of the filler tube 2, and a shutter 9 is provided at the end of the insertion portion 2a, which is biased in a direction to close the insertion portion 2a. is installed.

A vent valve 10 is provided in the vent tube 4 to communicate the vent tube 4 and the filler tube 2 when the shutter 9 is opened.

Further, a relief valve 11 is provided adjacent to the shutter 9 to release the internal pressure of the tank body 1 which increases when refueling is performed.

With the above configuration, when the filler cap 12 is opened during refueling, the shutter 9 is closed, so that evaporated fuel does not flow out from the filler tube 2.
When the nozzle 7a of the refueling gun 7 is inserted into the insertion portion 2a of the filler tube 2, the seal member 8 seals around the nozzle 7a of the refueling gun 7 to prevent the vaporized fuel from flowing out from here, and the shutter 9 opens. The vent valve 10 opens to ensure venting by the vent tube 4 through the canister 6.

[0008] Also, after the refueling is completed, the nozzle 7 of the refueling gun 7
When a is removed, the shutter 9 and the vent valve 10 are quickly closed to close the vent tube 4 and the filler tube 2, thereby preventing liquefied fuel and evaporated fuel from flowing into the vent tube 4. The basic structure is, for example, JP-A-62
-175219, and the relief valve is disclosed in Japanese Utility Model Application Publication No. 1-65717).

[0009]

[Problems to be Solved by the Invention] By the way, in the filler cap 11, for example, there is a tank as shown in the Automobile Engineering Handbook, Volume 6, pages 1-44, published by the Society of Automotive Engineers of Japan in September 1988. There is a structure that incorporates a positive pressure valve to release this pressure from the filler cap 12 when the inside of the main body 1 becomes positive pressure. When applied to the structure of the oil supply section, the filler cap 12
In the closed state, the shutter 9 is closed, and the opening pressure of the relief valve 11 is set to a relatively high pressure during refueling, so that the pressure inside the tank body 1 does not act on the filler cap 12. First, there is a problem in that the positive pressure valve provided in the filler cap 12 cannot function.

SUMMARY OF THE INVENTION Therefore, the present invention provides a structure for a fuel supply portion of a fuel tank that is capable of functioning as a relief valve when refueling and at the same time functioning as a positive pressure valve of a filler cap when the filler cap is attached. It is.

[0011]

[Means for solving the problem] A vent tube that communicates with the canister is connected to the filler tube provided in the tank body, and a shutter is provided that is pressed to open when the refueling gun is inserted, and a shutter is provided between the filler tube and the nozzle of the refueling gun. A sealing member is provided in the tank, a relief valve is provided in a passage connecting the tank body side isolated by the shutter and the filler cap side, a positive pressure valve is provided in the filler cap, and a link member is provided that opens the shutter when the filler cap is closed. .

0012

[Operation] When the filler cap is closed after refueling, the shutter opens via the link member, so the pressure inside the tank body acts on the filler cap, and therefore, when the pressure inside the tank body exceeds a predetermined pressure, it is released from the filler cap.

On the other hand, if the filler cap is opened prior to refueling, the link member will no longer act on the shutter, so the shutter will close, thus preventing the vaporized fuel from flowing out from the filler tube. When the filler tube is inserted into the tank, the shutter opens, but the seal member seals between the nozzle of the refueling gun and the filler tube, preventing the vaporized fuel from leaking out.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a fuel tank body 1 for a vehicle is shown.
An evaporative tube 3 is connected to the upper wall, a filler tube 2 is connected to the side wall of the fuel tank body 1, a vent tube 4 is connected to the filler tube 2, and a canister 6 is connected to the evaporative tube 3. The vent tube 4
The basic structure is the same as that of the prior art, including that the canisters 5 are connected to each other.

Here, a valve unit 13 is installed in the insertion portion 2a of the nozzle 7a of the refueling gun 7 of the filler tube 2.
is inserted and fixed.

The valve unit 13 is provided with an insertion passage 14 for the nozzle 7a of the refueling gun 7 and a relief passage 15.The insertion passage 14 has a shutter 9 that is opened when pressed by the nozzle 7a, and the relief passage 15 has a shutter 9 that is opened when pressed by the nozzle 7a. A relief valve 11 is provided in each case. Note that 16 is a sealing member for the shutter 9, and 8 is a sealing member for sealing the nozzle 7a of the refueling gun 7.

The valve unit 13 has an insertion hole 17 that opens near the rotation end of the shutter 9 and is connected to the nozzle 7a.
The link member 18 is inserted into the insertion hole 17.

The link member 18 has a head 18a near the filler cap 12, and the head 18a and the valve unit 1
When the filler cap 12 is screwed into the filler tube 2, the tank body 1
The closer end protrudes from the end of the insertion hole 17, and the shutter 9
The insertion passage 14 is opened by pressing . still,
A seal 19 that comes into close contact with the link member 18 is provided on the inner wall of the insertion hole 17 .

On the other hand, the filler cap 12 is provided at its center with a positive pressure valve 21 that opens when the internal pressure of the tank body 1 becomes positive and releases the internal pressure of the tank body 1 from the flow port 20.

The positive pressure valve 21 has a valve body 21a biased by a spring 21b and brought into close contact with a seal rubber 22 attached to the filler cap 12.The valve body 21a has a negative pressure valve 23 made of rubber or the like. is installed.

The negative pressure valve 23 is an umbrella-shaped member attached to the center of the valve body 21a from the tank body 1 side, and opens the outside air inlet 24 of the valve body 21a when the inside of the tank body 1 becomes negative pressure. It is something.

According to the structure of the above embodiment, when the filler cap 12 is opened for refueling, the link member 18 released from the pressure of the filler cap 12 is moved closer to the filler cap 12 by the spring 18b, as shown in FIG. Due to the movement, the shutter 9 comes into close contact with the sealing material 16 and closes the insertion passage 14.

[0024] Therefore, evaporated fuel does not flow out from the filler tube 2.

Next, when the nozzle 7a of the refueling gun 7 is inserted into the insertion part 2a of the filler tube 2, the nozzle 7a is sealed by the sealing member 8, so that the evaporated fuel does not flow out from around the nozzle 7a, and the tank body 1 The evaporated fuel in the filler tube 2 is led out to the canisters 6 and 5 from the evaporative tube 3 and the vent tube 4 opened by the vent valve 10.

[0026] At the time of refueling, for example, an auto-stop sensor (not shown) of the nozzle 7a of the refueling gun 7 is activated.
When the pressure inside the tank body 1 increases due to a malfunction or the like, the relief valve 11 opens and fuel leaks from the relief passage 15, thereby notifying the user of an abnormality.

[0027] After refueling, the filler cap 12
When the tank body 1 is closed, the link member 18 pressed by the filler cap 12 pushes open the shutter 9, so the insertion passage 14 is opened and the pressure inside the tank body 1 acts on the filler cap 12.

Therefore, when the pressure inside the tank body 1 becomes high, the positive pressure valve 21 opens to release the pressure from the flow port 20, and when the inside of the tank body 1 becomes negative pressure, the negative pressure valve 23 opens the outside air inlet 24. Outside air is introduced through the flow port 20.

In this way, with the filler cap 12 attached, the effect of the relief valve 11 is eliminated, and the positive pressure valve 21 and negative pressure valve 23 of the filler cap 12 are activated.

It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. A simple structure may be used in which the arm 24 pushes the shutter 9 open when the filler cap 12 is closed. In FIG. 3, the same parts as those in the embodiment described above are given the same reference numerals, and the description thereof will be omitted.

[0031]

[Effects of the Invention] As explained above, according to the present invention, when the filler cap is closed, the shutter is opened by the link member, thereby eliminating the effect of the relief valve and allowing the positive pressure valve of the filler cap to function. When the filler cap is removed, the shutter closes to prevent evaporated fuel from flowing out, allowing the relief valve to function during fuel refueling.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing an embodiment of the invention.

FIG. 2 is a sectional view of the main part with the filler cap removed.

FIG. 3 is a sectional view of a main part of another embodiment.

FIG. 4 is a cross-sectional view of the main part of the prior art.

FIG. 5 is an overall explanatory diagram of the fuel tank device.

[Explanation of symbols]

1... Tank body, 2... Filler tube, 6... Canister, 7... Refueling gun, 7a... Nozzle, 8... Seal member, 9
...Shutter, 11...Relief valve, 12...Filler cap, 18...Link member, 21...Positive pressure valve.

Claims (1)

[Claims] Claim 1: A vent tube communicating with the canister is connected to a filler tube provided in the tank body, and a shutter is provided which is pressed and opened when the refueling gun is inserted.
A seal member is provided between the filler tube and the nozzle of the refueling gun, a relief valve is provided in the passage connecting the tank body side isolated by the shutter and the filler cap side, and a positive pressure valve is provided in the filler cap to close the filler cap. A fuel supply section structure for a fuel tank, characterized in that a link member is provided to open the shutter when the shutter is opened.