JP2539548Y2 - Fuel tank lid - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for a fuel tank of an automobile or the like, and more particularly, to a lid for sealing a fuel tank when the fuel tank is heated due to a fire or the like and the internal pressure is increased. The present invention relates to a fuel tank lid for preventing a fuel tank from being ruptured due to a hole formed therein.

[0002]

2. Description of the Related Art A conventional fuel tank cover A includes a cover body 1 and a handle portion 2 as shown in a vertical sectional view of FIG. The lid body 1 has a cylindrical portion 5 having a male screw 4 screwed to the filler neck 3 of the fuel tank, a partition wall 6 provided on the inner surface of the cylindrical portion 5 to prevent fuel leakage from the fuel tank, and a cylindrical portion. 5, four engagement pieces 7a provided on one side
And two protruding pieces 7b provided at both ends of two of the four engaging pieces 7a (see FIG. 7).

The projection 7b is an elastically deformable cantilever,
An engagement projection 8 protruding laterally is provided at the distal end portion.
reference). The engaging projection 8 has a slope 8a formed at the tip and a locking surface 8b formed on the back surface of the slope.

The handle portion 2 has a cylindrical portion 2b for accommodating the cylindrical portion 5 extending around the periphery of the circular upper wall 2a.
b, an annular engaging groove 9 is formed on the inner peripheral surface thereof.
The cover main body 1 and the handle portion 2 are rotatably engaged with each other by engaging the engagement pieces 7a. A ring 10 is fitted on the inner surface of the upper wall 2a of the handle portion 2, and a plurality of claws 11 having an inclined surface 11a formed on one side and a locking surface 11b formed on the other side are arranged on the inner peripheral surface of the ring 10. The claw 11 is engaged with the engagement projection 8 of the projection piece 7b. When the lid body 1 and the handle portion 2 are assembled, the distance between the partition wall 6 of the lid body 1 and the upper wall 2a of the handle portion 2 is about the length L ₁ (2 cm) of the handle portion 2.

[0005] The fuel tank lid A constructed as described above
In order to attach the male screw 4 to the fuel tank, the male screw 4 is inserted into the filler neck 3 and the handle portion 2 is turned in the direction in which the male screw 4 is screwed.
Is pressed, and the lid body 1 is screwed into the filler neck 3. Thus, the fuel tank is sealed by the partition 6. If the screwing torque becomes too large while the male screw 4 is being screwed in, the protrusion 7b bends and the inclined surface 8a comes off the inclined surface 11a, so that the fuel tank lid A is prevented from being closed too much.

On the other hand, in order to remove the fuel tank cover A from the fuel tank, the handle portion 2 is turned in the opposite direction and the claw 1 is turned.
The first locking surface 11b presses the locking surface 8b of the engagement protrusion 8;
The male screw 4 of the lid body 1 may be removed from the filler neck 3.

[0007]

In the structure of the conventional fuel tank cover A, the partition wall 6 of the cover body 1 and the handle portion 2 are provided.
Distance upper wall 2a of the, since apart extent length L ₁ of the handle portion 2, car cause fire and traffic accident,
Even when the handle portion 2 is melted by fire heat, the partition wall 6 which L ₁ degree apart is not so much affected by the heat. as a result,
The internal pressure of the fuel tank sealed by the partition 6 increases,
There is a risk that the fuel tank will burst and the disaster will be even greater. The purpose of the present invention is to solve such a problem.Because an automobile fires and the heat causes the internal pressure of the fuel tank to increase, a hole is opened in the fuel tank lid to communicate with the atmosphere, and the fuel tank ruptures. It is intended to provide a lid for a fuel tank which prevents the occurrence of fire and enhances safety in a fire.

[0008]

In order to achieve the above object, the present invention provides a fuel tank having a male screw threaded with a filler neck, a partition wall for shutting off outside air, and a member formed at one end. a lid body of a synthetic resin material having a coupling piece, in a fuel tank lid composed of a handle portion of the synthetic resin material forming the engagement groove in which the engagement piece is fitted, the partition wall of the lid body, Forming a bulging portion protruding toward the handle portion side, forming a thin portion substantially at the center of the handle portion,
In the assembled state of the engaging pieces fitted into the engagement groove of the handle portion of the lid body, and the protruding portion and the thin portion contact with each other
It is characterized by being in a touching or approaching position.

[0009]

The fuel tank lid constructed as described above can be attached to and removed from the fuel tank by turning the handle, similarly to the conventional fuel tank lid. The fuel tank lid attached to the fuel tank hermetically seals the fuel tank with a partition provided in the cylindrical portion.

When the temperature around the fuel tank becomes high, the temperature of the handle portion directly exposed to the high temperature and the bulging portion of the partition wall near the handle portion increase. Since the lid body and the handle are made of a synthetic resin material, they become semi-molten as the temperature rises, and holes are opened in the bulging portion of the lid body and the thin portion of the handle. Also, when gas is generated in the fuel tank and the internal pressure increases,
The gas pressure has the effect of promoting the opening of the semi-molten portion, and the hole is reliably opened before the gas pressure becomes sufficiently high. When the hole is opened, the internal pressure of the fuel tank is maintained at substantially the atmospheric pressure, and the fuel tank is prevented from being broken.

[0011]

Referring to the drawings for the embodiment of EXAMPLES present invention, FIG. 1 is a longitudinal sectional view of the fuel tank lid A _1, 2 is a longitudinal sectional view of the handle portion 13, FIG. 3 of the cover body 12 FIG. 4 is a longitudinal sectional view of the lid main body 12. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted. Fuel tank closure A ₁ is a lid body 12 made of a thermoplastic synthetic resin such as polyacetal, and the handle portion 13 made of a thermoplastic synthetic resin such as nylon.

The structure of the lid body 12 is similar to the lid body 1 of the prior art, and is provided on the inner surface of the cylindrical portion 5 having the male screw 4 and on the inner surface of the cylindrical portion 5 in order to prevent fuel leakage from the fuel tank. It has a partition wall 14, four engagement pieces 7 a provided on one side of the cylindrical portion 5, and projection pieces 7 b provided at both ends of two of the four engagement pieces 7 a. An engagement protrusion 8 protruding laterally is provided at a tip end of the projection piece 7b, and the engagement protrusion 8 may have an inclined surface 8a formed at the end and a locking surface 8b formed on the back surface of the inclined surface. This is the same as the conventional example, but different from the conventional example is that a bulging portion 15 protruding toward the handle portion 13 is provided at the center of the partition wall 14.

The structure of the handle portion 13 is also similar to that of the conventional handle portion 2. A ring 10 is fitted to an upper wall 13a, and a claw 11 disposed on the inner peripheral surface of the ring 10 has an inclined surface 11a. A locking surface 11b is formed, but the handle 13
A thin portion 16 is formed substantially at the center. Therefore, when the lid body 12 and the handle portion 13 are assembled, the bulging portion 15 near the thin portion 16 contacts or approaches the thin portion 16.

[0014] Next, the operation of the fuel tank lid A ₁ configured as described above. To attach the fuel tank cover A ₁ to the filler neck 3, insert the male screw 4 into the filler neck 3 and turn the handle 13 in the direction in which the male screw 4 is screwed. The partition 14 seals the fuel tank. The protruding piece 7b has a function of preventing over-closing, and when the handle 13 is turned in the opposite direction, the handle 7 is removed from the filler neck 3.
This is the same as the conventional example.

Therefore, when the temperature around the fuel tank becomes high, the handle portion 1 made of thermoplastic resin is directly exposed to high temperature.
3 immediately becomes a semi-molten state. Also, the tip of the bulging portion 15 located near the thin portion 16 is also heated to a high temperature due to the heat of the handle portion 13 being transmitted, and a semi-molten state is formed, and a hole is opened in a portion where the shape has collapsed. Further, when gas is generated in the fuel tank and the internal pressure increases, the gas pressure has an effect of assisting the opening of the portion in the semi-molten state, and the hole is reliably opened before the gas pressure becomes sufficiently high. When the hole is opened, the internal pressure of the fuel tank is maintained at substantially the atmospheric pressure, and the fuel tank is prevented from being broken.

[0016]

[Effects of the Invention] The present invention is configured as described above. Therefore, even if a fire or the like occurs in a vehicle equipped with a fuel tank, the fuel tank lid can be used before the internal pressure of the fuel tank increases. A hole is formed, and the internal pressure of the fuel tank is maintained at approximately atmospheric pressure. Therefore, there is no possibility of the fuel tank exploding, and the safety of the fuel tank at the time of fire is enhanced.

[Brief description of the drawings]

1 is a longitudinal section of the lid A ₁ fuel tank.

FIG. 2 is a vertical sectional view of a handle portion 13;

FIG. 3 is a front view of the lid main body 12.

FIG. 4 is a longitudinal sectional view of the lid main body 12.

FIG. 5 is a plan view of the lid main body 12. FIG.

FIG. 6 is a longitudinal sectional view of a conventional fuel tank cover A.

FIG. 7 is a plan view of a conventional lid body 1.

[Explanation of symbols]

 A fuel tank lid 4 male screw 5 cylindrical part 7a engaging piece 7b protruding piece 8 engaging protrusion 9 engaging groove 10 ring 11 claw 12 lid body 13 handle part 14 partition wall 15 bulging part 16 thin part

 ──────────────────────────────────────────────────の Continued on the front page (72) Koji Okada 12-1, Matsuyama-cho, Moka-shi, Tochigi Pref.

Claims (1)

(57) [Scope of request for utility model registration] 1. A synthetic resin lid body having a male screw threaded with a filler neck of a fuel tank, an inner partition wall for shutting off outside air, and an engaging piece formed at one end, in the fuel tank lid composed of a handle portion of the synthetic resin material forming the engaging groove piece is fitted, the partition wall of the lid body to form a bulge protruding above the handle portion, said handle substantially central thin portion is formed, in the assembled state the engaging pieces fitted into the engagement groove of the handle portion of the lid body, the bulged portion and the thin portion and is tangential to each other parts
A lid for a fuel tank, wherein the lid is in contact with or in proximity to the fuel tank.