JPH0589059U - Fuel tank injection pipe device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To secure the flexibility of the seal material used for the fuel tank injection pipe. A seal member 7 into which a fueling nozzle A is fitted when the refueling nozzle A is inserted into an injection pipe 3 connected to a fuel tank,
A shutter 6 that is pushed open by the nozzle A is provided. The valve seat portion 9 on which the shutter 6 is seated is integrally formed with the seal member 7 to share the parts. The seal member 7 is formed with a portion 9 that is constantly exposed to the internal space of the pipe on the fuel tank side. Even if the soft material contained in the seal member 7 is melted out by the fuel vapor, the fuel vapor constantly infiltrates into the seal member 7 from the portion 9, so that the flexibility of the seal member 7 is maintained by the fuel vapor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to an injection pipe device for a fuel tank mounted on an automobile.

[0002]

[Prior Art]

 Conventionally, according to Japanese Utility Model Laid-Open No. 61-127025, a seal member into which a refueling nozzle is fitted when a refueling nozzle is inserted and a shutter which is pushed open by the refueling nozzle are provided in an injection pipe connected to a fuel tank, and are always provided. The shutter closes the inner space of the pipe on the fuel tank side to prevent the release of fuel vapor into the atmosphere, and when inserting the refueling nozzle and injecting fuel, the seal member prevents the release of fuel vapor. It is known that In addition to this seal member, a seal member on which the shutter is seated when the refueling nozzle is not inserted is provided.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, since separate seal members for the fueling nozzle and the shutter are provided, the structure becomes complicated. In addition, a rubber seal generally used as a seal member contains a soft material in order to improve the adhesion to the member to be sealed, but the soft material is soluble in fuel such as gasoline. While exposed to the fuel vapor, the fuel vapor infiltrates inside instead of the flexible material to maintain flexibility, but the sealing member for the refueling nozzle of the above-mentioned prior art always has the shutter closed. Since the contact with the fuel vapor is cut off, the impregnated fuel vapor escapes into the air and loses flexibility and deteriorates early. SUMMARY OF THE INVENTION In view of the above points, the present invention provides a fuel tank injection pipe device in which the seal members for the fueling nozzle and the shutter are integrated and the durability of the seal members can be improved. Has an aim.

[0004]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention has a seal member into which a nozzle is fitted at the time of insertion of a fuel filler nozzle and a fuel filler nozzle that is pushed open in an injection pipe connected to a fuel tank. When a refueling nozzle is not inserted, the valve seat portion on which the shutter is seated is integrally formed with the seal member, and the fuel is always irrespective of whether the refueling nozzle is inserted into the seal member. It is characterized in that a part exposed to the internal space on the tank side is formed.

[0005]

[Action]

 When the fuel filler nozzle is inserted and fuel is injected, the nozzle is fitted into the seal member, while the shutter is always seated on the valve seat portion integrated with the seal member. The sealability of the inner space of the side pipe is secured. Also, regardless of whether the fuel nozzle is inserted or not, a part of the seal member is always exposed to the internal space of the fuel tank side, so the fuel vapor permeates into the seal member from this part and the flexibility of the seal member increases. Maintained.

[0006]

【Example】

 Referring to FIG. 1, reference numeral 1 denotes a fuel tank for an automobile, an injection pipe 3 extending from an oil filling port 2 on the outer surface of a vehicle body is connected to the fuel tank 1, and a refueling nozzle A is inserted from the oil filling port 2 into the injection pipe 3. Then, fuel such as gasoline is injected into the fuel tank 1.

As shown in FIG. 2, a partition member 5 having a through hole 4 into which the oil supply nozzle A can be loosely inserted is fixedly provided in the injection pipe 3, and the through hole is provided downstream of the partition member 5. A shutter 6 for closing 4 is provided so as to be swingable about a pivot shaft 6a at one end and biased toward the partition member 5 by a spring (not shown).

A seal member 7 made of an annular rubber seal is attached to the through hole 4, and a lip portion 7a having an arc-shaped cross section which is curved inward in the radial direction is formed in the seal member 7 so as to form a refueling nozzle. When the nozzle A is inserted, the inner peripheral surface of the lip portion 7a comes into close contact with the outer peripheral surface of the nozzle A, and even if the shutter 6 is pushed open by the fueling nozzle A, the internal space of the fuel tank side, that is, the partition member 5 The downstream side space is designed to be sealed. Further, the tip portion of the lip portion 7a is projected from the through hole 4 toward the downstream side space, and the shutter 6 is normally seated on the valve seat portion 8 constituted by the front end of the lip portion 7a, so that the downstream side space The sealability is ensured. Here, the outer peripheral surface of the lip portion 7a is a portion 9 that is exposed to the downstream space even when the shutter 6 is seated on the valve seat portion 8 and closed, and the fuel vapor from the fuel tank 1 is The seal member 7a maintains its flexibility by penetrating into the seal member 7 from the outer peripheral surface of the lip portion 7a.

The shape of the seal member 7 is not limited to the above embodiment, and for example, as shown in FIG. 3, a lip portion 7b into which the oil supply nozzle is fitted in the seal member 7 and a valve on which the shutter 6 is seated. The lip portion 7c serving as the seat portion 8 may be separately provided, and the lip portion 7c may be projected into the downstream side space so that the portion 9 that is always exposed to the downstream side space is formed by the outer peripheral surface of the lip portion 7c. Further, as a modification of the embodiment of FIG. 3, as shown in FIG. 4, a convex portion 7d is formed on the outer peripheral surface of the valve seat portion 8 projecting into the downstream space, and the portion 9 exposed to the downstream space is formed. The area may be increased. Further, as shown in FIG. 5, a seal member 7 having a round cross section, into which the oil supply nozzle A can be fitted, is attached to the opening edge portion of the through hole 4 facing the downstream space, and the seal member facing the downstream space. The top surface of 7 may be the valve seat portion 8 for the shutter 6, and the portion 9 that is always exposed to the downstream space may be the outer peripheral surface of the seal member 7.

[0010]

[Effect of the device]

 As is apparent from the above description, according to the present invention, the seal members for the fuel nozzle and the shutter can be integrated to simplify the structure, and the seal member is not concerned with the insertion of the fuel nozzle. Instead, the fuel vapor permeates from the portion exposed to the internal space on the fuel tank side, maintaining the flexibility of the seal member and improving the durability.

[Brief description of drawings]

FIG. 1 is a schematic view showing a layout of an injection pipe to which the device of the present invention is applied.

FIG. 2 is an enlarged cross-sectional view of a main part of the first embodiment of the device of the present invention.

FIG. 3 is a sectional view of a second embodiment.

FIG. 4 is a sectional view of a third embodiment.

FIG. 5 is a sectional view of a fourth embodiment.

[Explanation of symbols]

1 Fuel Tank 3 Injection Pipe 6 Shutter 7 Sealing Member 8 Valve Seat 9 Portion Exposed to Fuel Tank Side Pipe Inner Space A Refueling Nozzle

Claims (1)

[Scope of utility model registration request] 1. An injection pipe connected to a fuel tank is provided with a seal member into which a fueling nozzle is fitted when the fueling nozzle is inserted, and a shutter which is pushed open by the fueling nozzle, the shutter being provided when the fueling nozzle is not inserted. A fuel tank characterized in that a valve seat portion to be seated is formed integrally with the sealing member, and a portion which is always exposed to the internal space of the fuel tank side is formed in the sealing member irrespective of insertion of a fueling nozzle. Injection tube device.