JPH0413236Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a breather mechanism for communicating the tank chamber of a fuel tank with outside air and sucking air into the tank chamber, especially suitable for use in large vehicles. This invention relates to a breather mechanism for a fuel tank cap.

[Conventional technology]

Conventionally, the breather mechanism of a fuel tank in a large vehicle as described above consists of a cap mainly consisting of an inner cap and an outer cap, and a breather hole is bored in the inner cap, and a breather passage is formed between both caps. The so-called open-air type was common.

However, this open-to-atmosphere type has a drawback that, especially when the tank is full, fuel may leak to the outside through the breather hole and the breather passage due to vibrations such as when the vehicle turns.

For this reason, some have a breather hole on the back of the claw so that fuel does not come into contact with it directly, and others have a rubber mushroom-shaped valve installed inside the breather hole so that the tank itself can breathe. , Utility Model Application No. 52-80315, a main buffer chamber is formed between the cap body and the upper surface of the breather member, and a sub-buffer chamber is formed in the lower part of the breather member, and both buffer chambers are communicated with each other. The main buffer chamber is opened in the horizontal peripheral wall of the cap body, Utility Model Publication No. 49-43293
As a model, the shaft of a hard material is fitted into a hole formed vertically in a cap that is made of a flexible elastic material such as rubber and is fitted into the inlet of a tank, and the unevenness formed on the joint surface of the cap is fitted into the hole. Rotatably press-fit,
A tank cap device, wherein the lower end of the hole is provided with a notch that opens into the tank, and the lower opening of the vent hole formed in the tank, which communicates the inside and outside of the tank, is formed so as to be selectively aligned with the notch; Furthermore, Utility Model Application Publication No. 57-92654 discloses a hollow container having an opening into which a cap is inserted and removed, an axial long groove communicating with the atmosphere on the outer peripheral surface of the cap which is inserted into and removed from the opening, and an axial long groove communicating with the atmosphere. The axial long grooves communicating with the chamber are formed with a phase difference in the circumferential direction of the cap,
A number of resin containers have been developed in which the pair of axial long grooves are communicated with each other via an annular groove formed on the outer peripheral surface of the cap.

[Problem that the invention attempts to solve]

However, with the conventional means as mentioned above,
It is not possible to manufacture and use the conventional general atmosphere-opening type as described above, and it requires changes to the structure of the tank or cap, or requires a valve made of high-grade material. The problem is that it ends up being expensive.

[Means for solving problems]

In view of the above, the present invention was devised for the purpose of providing a device that can be immediately implemented for the conventional general open-to-air type as described above, and that can reliably prevent fuel leakage. The gist of the fuel tank is to provide a fuel tank consisting of an inner cap and an outer cap, a radial breather passage being formed between the two caps, and a breather hole formed in the inner cap. In the cap, a diametrically lateral through hole is made in the head,
The breather mechanism for a fuel tank cap is characterized in that a clip is mounted in the breather hole, the clip having a communication hole in the body part communicating with the horizontal through hole and the other end communicating with the outside.

(Function) By using a conventional general atmosphere-opening fuel tank and cap as is, and inserting the clip into the breather hole drilled in the inner cap of the cap, the clip can be opened. into the breather hole as a barrier,
This further prevents fuel leakage, and by opening the clip on both sides of the breather hole and communicating these openings, it functions as a breather.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the embodiment shown in FIGS. 1 to 5. In the figures, 1 is a fuel tank, and a cap 3 is attached to the upper end of a filler pipe 2 of this fuel tank 1. .

This cap 3 is mainly composed of two bent plate bodies, namely an inner cap 4 and an outer cap 5. A packing 6 is provided between the two caps 4 and 5, and a gasket 6 is provided on the bottom surface of the inner cap 4. In addition to the gaskets 7, a linear breather passage 8 is formed, and the inner cap 4 is further provided with a breather hole 4a.

Thus, the tank chamber of the fuel tank 1 is communicated with outside air through the breather hole 4a and the breather passage 8, so that air can be sucked into the tank chamber. The above structure is similar to that of a cap used in a conventional general open air type fuel tank, but the present invention further includes the following structure.

That is, reference numeral 9 denotes a resin clip that is inserted into the breather hole 4a to prevent fuel from leaking therefrom.
A horizontal through hole 10a passing through in the diametrical direction is formed in the body portion 11, a rectangular through hole 11a is formed in the flat body portion 11, and a communication hole 12 is formed between the horizontal through hole 10a and the through hole 11a. When the clip 9 is inserted into the breather hole 4a, the through hole 11a is exposed to the outside.

Thus, the tank chamber of the fuel tank 1 is communicated with outside air through the horizontal through hole 10a, the through hole 11a, the communication hole 12, and the breather passage 8, thereby providing a function as a breather. When fuel is applied to the head 10 of the head 10 from the Z direction shown in FIG.
By simultaneously applying pressure from the -X' direction and canceling out this pressure, infiltration of fuel into the horizontal through hole 10a and furthermore, leakage of fuel from the fuel tank 1 is prevented as much as possible.

It has been confirmed through experiments that fuel leakage is significantly reduced by inserting the clip 9 into the breather hole 4a in this way.

FIG. 6 shows another embodiment of the present invention, in which a vertical hole 10b is formed in the head 10, and clips 9', 9' similar to those described above are connected to the breather holes 4a, 4a, and 9' of the inner cap in the body 11. 4a, and insert both ends of a pipe 13 bent into a substantially U-shape into both vertical holes 10b, 10b, respectively, and furthermore, a sub-breather is installed above the pipe 13, that is, on the side of the inner cap 4. Holes 13a, 13a are provided to communicate with the outside air.

Therefore, the fuel leaks into the pipe 13,
Furthermore, leakage of fuel is prevented by assuming that only the fuel has entered the vertical hole 10b through this hole.

[Effect of idea]

As described above, the breather mechanism for a fuel tank cap according to the present invention is composed of an inner cap and an outer cap, and a radial breather passage is formed between the two caps, and a breather hole is provided in the inner cap. A clip for a fuel tank having a diametrical horizontal through hole in the head and a communication hole in the body with one end communicating with the horizontal through hole and the other end communicating with the outside. Since it is configured to be installed in the breather hole, it can be used as is without making any changes to conventional general atmosphere-opening fuel tanks and caps, and is therefore extremely inexpensive. Not only can it be installed extremely easily on existing vehicles, but it also reliably prevents fuel leakage and improves total fuel efficiency, while also preventing damage to the vehicle's aesthetics. It has various effects that make it easy to store.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Fig. 1 is a longitudinal sectional view (Fig. 3 I-I line sectional view), Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a plan view, Fig. 4 is a perspective view showing the clip, FIG. 5 is a perspective view showing a fuel tank equipped with the present invention, and FIG. 6 is a longitudinal sectional view showing another embodiment. 1... Fuel tank, 3... Cap, 4... Inner cap, 4a... Breather hole, 5...
Outer cap, 8...breather passage, 9,
9'... Clip, 10... Head, 10a... Horizontal through hole, 10b... Vertical hole, 11... Body, 12
...Communication hole, 13...Pipe, 13a...Subbreather hole.

Claims (1)

[Scope of utility model registration request] A fuel tank cap is composed of an inner cap and an outer cap, and a radial breather passage is formed between the two caps, and a breather hole is bored in the inner cap. A cap for a fuel tank, characterized in that a clip is mounted in the breather hole, the clip having a lateral through hole and a communication hole in the body, one end of which communicates with the lateral through hole and the other end of which communicates with the outside. Breather mechanism.