JPH0796758A - Fuel tank shutter structure - Google Patents

Abstract

(57) [Summary] [Purpose] The fuel tank has a shutter structure that prevents refueling from starting until the switch of the valve of the pipe adjacent to the filler tube is actuated by the shutter. A rotation surface of a shutter 9 rotatably supported between a position in contact with the surface 8b of the opening 8a of the nozzle guide portion 8 to close the surface 8b of the opening 8a and a position to open the surface 8b of the opening 8a. When the refueling gun 7 rotates the shutter 9, the expansion portion 9b, which is slidable in the opening 8a of the nozzle guide portion 8 and has a substantially fan-shaped cross section, is projected from the insertion portion 2a of the filler tube 2 from the shutter 9a. Presses the switch 15 of the vent cut valve 10 and activates the switch 15 so that the expanded portion 9b has a central angle of a substantially fan-shaped cross section so that the expanded portion 9b passes through the opening 8a of the nozzle guide portion 8. Let

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter structure for a fuel tank of an automobile or the like.

[0002]

2. Description of the Related Art For example, as a shutter structure for an automobile fuel tank, see FIG. 6 (JP-A-1-44327).
Alternatively, there is one shown in FIG. 7 (see Japanese Utility Model Laid-Open No. 5-8641). In FIG. 6, a nozzle 7 a of the fuel gun 7 is provided in a filler tube 2 attached to a tank body 1 not shown.
A nozzle guide portion 8 for receiving the surface 8b of the opening 8a of the nozzle guide portion 8 and a surface 8b of the opening 8a for closing the surface 8b of the opening 8a and the surface 8 of the opening 8a.
A shutter 9 rotatably supported by a pin 16 is attached between positions where b is opened (shown by a solid line). The shutter 9 is biased to a position that closes the surface 8b of the opening 8a. A vent tube 4 is arranged adjacent to the filler tube 2, one end of which is connected to the filler tube 2 and the other end of which is connected to a canister.

The vent tube 4 is provided with a vent cut valve 10. Vent cut valve 10
Is a casing 11 fixed to the filler tube 2.
And a pair of ports 12 connected to the vent tube 4,
12, a valve body (not shown) biased in the closing direction by a spring (not shown), and a switch 1 that is integrally formed with the valve body and projects into the filler tube 2.
5, the switch 15 is pressed by the shutter 9 at the position where the shutter 9 opens the surface 8b of the opening 8a to operate the valve body,
Is opened to connect the ports 12 and 12 to each other. That is, at the time of refueling, the shutter 7 is rotated by the nozzle 7a of the refueling gun 7 as shown by the solid line to press the switch 15 so that the vent tube 4 is communicated with the filler tube 2 and the fuel vapor from the filler tube 2 is communicated. We are trying to prevent the outflow. Further, when the shutter 9 returns to the position where it closes the surface 8b of the opening 8a of the nozzle guide portion 8, the switch 15 also returns to the original state, and the communication between the vent tube 4 and the filler tube 2 is cut off. FIG. 7 shows another example, in which an evaporation tube 3, a vent tube 4, and a discharge tube 5 are arranged adjacent to the filler tube 2, one end of each of which is an inner wall of the filler tube 2 and an outer wall of the nozzle guide portion 8. Is introduced into the valve chamber 18 formed between the two. Further, although not shown, the other end of the evaporation tube 3 is connected to the tank body 1, the other end of the vent tube 4 is connected to the filler tube 2, and the other end of the discharge tube 5 is connected to the canister. A valve body 19 is provided in the valve chamber 18,
It is configured integrally with the switch 15 that is biased to project into the filler tube 2. At the time of refueling, the shutter 9 is rotated by the nozzle 7a of the refueling gun 7 and the switch 15
When is pressed, the valve body 19 blocks the evaporation tube 3 and the discharge tube 5 and connects the vent tube 4 and the discharge tube 5 to each other. Further, when the shutter 9 returns to the position where it closes the surface 8b of the opening 8a of the nozzle guide portion 8, the valve body 19 blocks the vent tube 4 and the discharge tube 5 and connects the evaporation tube 3 and the discharge tube 5 to each other. The evaporated fuel from the tank body 1 is processed.

[0004]

However, in the conventional fuel tank shutter structure shown in FIG. 6, when the nozzle 7a of the refueling gun 7 is inserted into the insertion portion 2a in the filler tube 2 during refueling, it is sufficient. In the state where it is not inserted all the way (the position of the shutter 9'in the figure), even though the opening 8a is opened, the shutter 9 does not raise the switch 15 and the valve body remains closed and the vent is opened. Refueling is performed in a state where the tube 4 and the filler tube 2 do not communicate with each other. Therefore, there is a problem in that it is impossible to prevent the evaporative fuel from flowing out from the filler tube 2 during fuel supply. The same problem occurs in the example of FIG. 7, and the refueling is performed in a state where the valve body 19 does not block the evaporation tube 3 and the discharge tube 5, and there is a risk of over-refueling. Therefore, the present invention has been made in view of the above points, and the object thereof is to operate the valve switch until it operates.
A shutter structure for a fuel tank in which refueling cannot be started.

[0005]

As a shutter structure for a fuel tank of the present invention, there is provided a nozzle guide portion for receiving a nozzle of a fuel gun in a filler tube, and a nozzle guide portion in contact with a surface of the opening of the nozzle guide portion. A rotation surface rotatably supported between a position for closing the surface and a position for opening the surface of the opening, and the rotation surface is biased to a position for closing the opening surface of the nozzle guide portion. A shutter, a pipe arranged adjacent to the filler tube, and a valve which has a switch projecting into the filler tube and actuable and depressible by the shutter so as to make the pipe conductive or non-conductive by the operation of the switch, In the shutter structure of the fuel tank provided, an expansion part slidable in the opening of the nozzle guide part and having a substantially fan-shaped cross section is provided from the rotation surface of the shutter to the insertion part side of the filler tube. When the refueling gun is rotated and the shutter is rotated, the shutter pushes the switch to activate the switch, and then the expansion portion passes through the opening of the nozzle guide portion. Have the angle of the central angle of.

[0006]

[Operation] According to the shutter structure of the fuel tank of the present invention, at the stage when the refueling gun starts rotating the shutter, the expansion portion protruding from the rotation surface of the shutter to the insertion portion side of the filler tube becomes the nozzle guide portion. Retaining does not start because the face of the opening is kept closed. After the shutter further rotates and the shutter presses the switch to activate the switch, the expansion portion passes through the opening of the nozzle guide portion and refueling is started. Therefore, refueling is started after the switch of the valve has been reliably operated and the valve has been operated, so that it is possible to prevent the outflow of the evaporated fuel and the excessive refueling.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are explanatory views of a shutter structure of a fuel tank according to an embodiment of the present invention. In the figure, a nozzle guide portion 8 for receiving the nozzle 7a of the fuel gun 7 is provided on the inner peripheral surface of the filler tube 2, and the nozzle guide portion 8 is provided.
Rotatably by means of a pin 16 between a position in contact with the surface 8b of the opening 8a to close the surface 8b of the opening 8a (shown in FIG. 2) and a position to open the surface 8b of the opening 8a (shown in FIG. 3). A shutter 9 having a supported rotating surface 9a is attached. The shutter 9 is configured such that the shutter 9 itself has the opening 8
It has an intervening member 17 made of a coil spring that urges the surface 8b of a to a position where the interposing member 17 extends toward the switch 15 protruding into the filler tube 2. A vent cut valve 10 that is operated by a switch 15 is provided in the vent tube 4 as in FIG. 6, and the operation of the switch 15 connects the vent tube 4 and the filler tube 2.

On the rotation surface 9a of the shutter 9, an expansion portion 9b is formed so as to protrude toward the insertion portion 2a side of the filler tube 2. As shown in FIGS. 4 and 5, the expansion portion 9b has a lower surface 9ba formed in an arcuate shape R around the center position 20a of the through hole 20 of the support portion 9c of the shutter 9 into which the pin 16 is inserted, The nozzle guide portion 8 has a rear surface 9bb having a diameter substantially the same as or slightly smaller than the diameter of the opening 8a, and is formed slidably with respect to the opening 8a and has a substantially fan-shaped cross section. Further, the lower end portion 9aa of the rotating surface 9a is formed so as to project downward from the lower surface 9ba and cover the surface 8b of the opening 8a of the nozzle guide portion 8. The central angle θ of the substantially fan-shaped cross section of the expansion portion 9b is set to be equal to or more than the rotation angle until the interposition member 17 presses the switch 15.

In the shutter structure constructed as described above,
As shown in FIG. 2, when the refueling gun 7 starts to rotate the shutter 9, the expansion portion 9b holds the surface 8b of the opening 8a of the nozzle guide portion 8 in a closed state, so that refueling is not started. Next, as shown in FIG. 1, after the shutter 9 further rotates and the intervening member 17 presses the switch 15, the expansion portion 9b passes through the opening 8a, and oil can be supplied. Further, as shown in FIG. 3, the nozzle 7a of the refueling gun 7 is
Is inserted into the filler tube 2, the interposition member 17 is compressed, and the rotation surface 9a and the expansion portion 9b of the shutter 9 are compressed.
Becomes substantially parallel to the filler tube 2 and refueling is performed. Therefore, according to this embodiment, the switch 15 of the vent cut valve 10 operates reliably and the refueling is started after the vent cut valve 10 communicates the vent tube 4 with the filler tube 2, so that evaporation is performed. It is possible to prevent the outflow of fuel. In the above embodiment, the vent tube 4 adjacent to the filler tube 2
Although the case where the filler tube 2 and the filler tube 2 are communicated with each other has been described, the present invention is not limited to this example, and the same can be applied to the example shown in FIG. 7 or the case where only the evaporation tube 3 is adjacent to the filler tube 2. . In such a case, refueling will be started after the evaporation tube 3 and the filler tube 2 are reliably shut off,
It is possible to prevent over-fueling.

[0010]

As described above, according to the shutter structure of the fuel tank of the present invention, the expansion portion slidable in the opening of the nozzle guide portion and having a substantially fan-shaped cross section is provided on the side of the insertion portion of the filler tube from the rotation surface of the shutter. When the refueling gun rotates the shutter, the shutter pushes the switch of the valve and actuates the switch, so that the expanded portion passes through the opening of the nozzle guide portion. Since the fan-shaped central angle is provided, the valve switch can be reliably operated, and refueling can be started after the valve is actuated, and it is possible to prevent evaporative fuel from flowing out or excessively refueling. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional structure showing a correlation between a position where a fuel gun according to an embodiment of the present invention contacts an opening surface of a nozzle guide portion and a shutter of a fuel tank.

FIG. 2 is a vertical sectional structure showing a shutter of the fuel tank of FIG.

FIG. 3 is a vertical sectional structure in which the fuel gun of FIG. 1 is inserted through an opening of a nozzle guide portion.

4 is a cross-sectional view of the shutter of FIG.

5 is an explanatory diagram according to arrow A in FIG.

FIG. 6 is a vertical cross-sectional structure showing the correlation between the position of the conventional fuel gun contacting the surface of the opening of the nozzle guide and the shutter of the fuel tank.

FIG. 7 is a vertical cross-sectional structure showing the correlation between the position of the conventional fuel gun contacting the surface of the opening of the nozzle guide and the shutter of the fuel tank.

[Explanation of symbols]

 1 Tank Main Body 2 Filler Tube 2a Filler Tube Insertion Section 3 Evaporative Tube 4 Vent Tube 5 Discharge Tube 7 Refueling Gun 7a Refueling Gun Nozzle 8 Nozzle Guide 8a Nozzle Guide Opening 8b Nozzle Guide Opening 9 Shutter 9a Rotating surface of shutter 9b Expansion part of shutter 10 Vent cut valve 15 Valve switch 17 Intervening member

Claims (1)

[Claims] 1. A nozzle guide part for receiving a nozzle of a fuel gun in a filler tube, and a position in contact with a surface of an opening of the nozzle guide part for closing the surface of the opening and a position for opening the surface of the opening. A shutter having a rotating surface that is rotatably supported by a roller, and the rotating surface is biased to a position that closes the surface of the opening of the nozzle guide portion; and piping arranged adjacent to the filler tube. In a shutter structure of a fuel tank, which comprises a valve which projects into the filler tube and can be pressed by a shutter and has a switch for connecting or disconnecting the pipe by the operation of the switch, When the expandable portion, which is slidable and has a substantially fan-shaped cross section, is projected from the rotation surface of the shutter toward the insertion portion side of the filler tube so that the refueling gun rotates the shutter. A fuel tank characterized in that a center angle of a fan-shaped cross section of the expanded portion is provided so that the expanded portion passes through the opening of the nozzle guide portion after the shutter presses the switch to activate the switch. Shutter structure.