JPH0529594Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a filler neck 7 formed at the tip of a filler pipe 3 connected to a fuel tank 1, to which a filler cap 5 is attached and detached (see FIG. 5).

<Conventional technology> FIG. 6 shows an example of a fillet neck.

A funnel-shaped cylindrical body 13 having a tip opening 13a into which a filler gun nozzle 9 can be inserted is disposed at an intermediate portion of the filler neck body 11 that does not interfere with the filler cap 5, and the tip opening 13a is formed of a spring plate. It is closed with a fuel splash prevention plate 15,
A trap mechanism is provided. In addition, the fuel splash prevention plate 15 and the tip opening 13 of the funnel-shaped cylinder
The contact mode a is not airtight because it only serves to prevent fuel from spilling out when the filler cap 5 is removed. In addition, the fuel splash prevention plate is
Some configurations are biased by torsion springs.

The filler cap 5 is equipped with a positive pressure/negative pressure valve mechanism that operates when the pressure is excessively positive and when the pressure is excessively negative.

That is, in the positive pressure valve mechanism, when there is excessive positive pressure on the tank side, the movable valve seat body 17 moves toward the cap head side against the spring force of the first coil spring 18, thereby controlling the positive pressure control portion 19a of the seal ring 19. The negative pressure valve mechanism moves the seal ring holder 21 to the filler neck side against the spring force of the second coil spring 23 when the tank side has excessive negative pressure, and the negative pressure valve mechanism moves the seal ring holder 21 to the filler neck side against the spring force of the second coil spring 23. This is an operation in which the pressure control section 19b is opened.

<Problems to be solved by the invention> However, in the above configuration, the positive pressure/negative pressure valve mechanism and the trap mechanism are provided in separate parts, making it difficult to manufacture and
The assembly time and number of parts increased.

In view of the above, it is an object of the present invention to provide a filler neck that is equipped with both a positive pressure/negative pressure valve mechanism and a trap mechanism, which can reduce manufacturing and assembly man-hours as well as the number of parts.

<Means for Solving the Problems> The present invention solves the above problems with the following configuration.

A valve seat member, which is a filler neck formed at the tip of a filler pipe connected to a fuel tank and to which a filler cap is attached and detached, and has an opening into which a filler gun nozzle can be inserted in an intermediate portion of the filler neck body that does not interfere with the filler cap. A hinge-type valve body is attached to the valve seat surface side of the valve seat member, and the hinge-type valve body is biased in the closing direction by a torsion spring that has a spring force that opens when there is over-negative pressure on the tank side. At the same time, a pressure reducing valve is installed that opens when there is excessive positive pressure on the tank side, and a pressure reducing valve is installed on the valve seat surface side of the valve seat member.
A fuel filler neck characterized by being equipped with a seal ring that abuts and seals when the hinge-type valve body is closed.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4. Note that parts that are the same as those in the above-mentioned drawing example are given the same reference numerals, and a part or all of the explanation will be omitted.

A valve seat member 31 having an opening 31a into which the filler gun nozzle 9 can be inserted is disposed at an intermediate portion of the filler neck body 11 that does not interfere with the filler cap 5A.

That is, a plate-shaped valve seat member 31 is held at the inner side of the tip of the funnel-shaped cylinder 13 by holding the outer circumference of the valve seat member 31 against the flange. This holding part is the O-ring 3
It is sealed with 3. Further, a cup-shaped seal ring 48 is attached to the periphery of the opening of the valve seat member 31 on the side of the valve seat surface. Here, the valve seat member 31
is formed separately from the funnel-shaped cylinder, but it may be formed integrally with the tip opening of the funnel-shaped cylinder.

A hinge-type valve body 3 is placed on the valve seat surface side of the valve seat member 31.
5 is installed, and the hinge-type valve body 35 is biased in the closing direction by a torsion spring 37 that has a spring force that closes when there is excessive negative pressure on the tank side, and opens when there is excessive positive pressure on the tank side. A valve 39 is installed.

Specifically, the hinge type valve body 35 is attached to the valve seat member 31
It is hinged to a fixed shaft 43 disposed via a bracket 41 erected on the valve seat side. Further, the hinge type valve body 35 is attached to the fixed shaft 43, and one end is in contact with the valve seat surface side of the valve seat member 31, and the other end is in contact with the side surface opposite to the valve seat facing surface of the hinge type valve body 35, It is designed to be biased in the closing direction. Here, as the torsion spring 37, not only the scissor-shaped one shown in the figure but also a coil-shaped one can be applied.

The hinge-type valve body 35 is a cylindrical body having a flange portion 45 serving as a sealing surface and a ventilation hole 46 at the center of the tip.
The coil spring 4 connects the dish-shaped sealing member 48 that opens and closes the
9, it is biased in the closing direction and built-in. Here, the coil spring 49 is interposed between a holding plate 51 that holds the plate-shaped seal member 48 and a spring seat plate 53 that closes the bottom of the cylindrical body to allow ventilation.
Note that the pressure reducing valve built into the hinge-shaped valve body 35 is not limited to this, and it is of course possible to adopt another general-purpose pressure reduction mechanism, for example, a structure incorporating a small hinge-shaped valve body.

Next, how the above embodiment is used will be explained.

When the inside of the fuel tank becomes overpositive, the dish-shaped seal member 48 moves in the opening direction against the coil spring 49 as shown in FIG. It acts as a positive pressure valve). On the other hand, when the inside of the fuel tank becomes over-negative, the hinge-type valve body 35 rotates in the opening direction against the spring force of the torsion spring 37, as shown in FIG. It is connected to the outside and acts as a negative pressure valve.

Furthermore, when the filler cap 5A is removed,
As shown in FIG. 1, the hinge-shaped valve body 35 is biased in the closing direction by a torsion spring 37, so that it functions as a mechanism for preventing fuel from spilling out.

Also, when inserting the filler gun nozzle 9,
As shown in FIG. 4, the hinge-shaped valve body 35 is largely rotated in the opening direction by the insertion force of the nozzle, so that there is no problem in fuel injection.

<Operations and Effects of the Invention> The fuel filler neck of the present invention is a filler neck formed at the tip of a filler pipe connected to a fuel tank, to which a filler cap is attached and detached. A valve seat member is provided with an opening into which a gun nozzle can be inserted, and a hinge-type valve body is attached to the valve seat surface side of the valve seat member, and the hinge-type valve body opens when there is over-negative pressure on the tank side. A pressure reducing valve is installed, which is biased in the closing direction by a torsion spring having a spring force of Equipped with a seal ring that seals when the body is closed.
With this configuration, the following actions and effects can be achieved.

Has good sealing properties - Since the negative pressure valve mechanism and trap mechanism are installed in the same location, and the negative pressure valve mechanism and trap mechanism can be combined, manufacturing and assembly man-hours can be reduced, as well as the number of parts. .

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention.
The figure is a cross-sectional view of the filler neck with the filler cap removed, and Figure 2 is a cross-sectional view of the filler neck with the filler cap attached.
3 is a cross-sectional view of the over-negative pressure state, FIG. 4 is a cross-sectional view of the filler neck when the filler cap is removed and the filler gun is inserted, and FIG. 5 is an explanation showing the formation site of the filler neck. FIG. 6 is a sectional view of a filler cap in a conventional example when the filler cap is attached. 1...fuel tank, 3...filler pipe, 5,
5A...Fira Cap, 7...Filanetsk,
11... Fillanetsu main body, 31... Valve seat member,
35... Hinge type valve body, 37... Torsion spring, 38
...Pressure reducing valve (positive pressure valve).

Claims (1)

[Scope of Claim for Utility Model Registration] A filler neck formed at the tip of a filler pipe connected to a fuel tank to which a filler cap is attached and detached, wherein a filler gun nozzle can be inserted into an intermediate portion of the filler neck body that does not interfere with the filler cap. A valve seat member having an opening is disposed, and a hinge-type valve body is attached to the valve seat surface side of the valve seat member, and the hinge-type valve body is opened by a spring force when there is negative pressure on the tank side. A pressure reducing valve (positive pressure valve) is mounted, which is biased in the closing direction by a torsion spring having A fuel filler neck characterized by being equipped with a seal ring that comes into contact with and seals when the molded valve body is closed.