JPS5931560Y2 - fuel tank lid - Google Patents

Description

[Detailed explanation of the invention] This invention allows air to enter the tank as fuel is used, like a lid attached to the fuel supply port of a car fuel tank, but the vapor of the fuel inside the tank This invention was devised for the purpose of obtaining a lid for a fuel tank that is easy to manufacture and can reduce production costs with respect to a lid for a fuel tank that prevents the fuel from leaking out.

FIG. 1 illustrates a conventionally used fuel tank lid.

1 is a circular cap with a handle 2 attached, and a cylindrical bracket 3 whose top is closed is joined to the bottom surface by spot welding.
A ring-shaped retainer 4 made of an elastic metal plate and backings 5 and 6 are interposed between the cap 1 and the stepped portion 3a of the bracket 3.

The base of the bracket 3 is provided with an air hole 7 facing the joining surface of the cap 1 and the retainer 4.

The valve seat plate 8, the rubber diaphragm 9, and the cover 10 are stacked and inserted into the cylindrical lower part of the bracket 3, and the peripheral part of the cover 10 is tightly fitted to the bracket 3, thereby forming the valve seat plate 8. , the peripheral edge of the diaphragm 9 is pressed against and fixed to the stepped portion 3a of the bracket 3.

Airtightness is maintained between the peripheral edge of the valve seat plate 8 and the inner surface of the bracket 3 because the peripheral edge of the diaphragm 9 (not shown, but this portion is made thick) is sandwiched therebetween.

An air hole 11 is formed in the valve seat plate 8, and an air hole 13 is formed in the central thick part 12 of the diaphragm 9, and a closed ridge 14 is formed surrounding this.

Below the thick part 12 there is a seat plate 15 having a hole that overlaps with the air hole 13 , and this seat plate 15 pushes up the lower surface of the thick part 12 by a spring 16 supported by the cover 10 . is brought into close contact with the valve seat plate 8.

Reference numeral 17 designates a projection that projects laterally from the lower part of the bracket 3 and is engaged with the fuel supply port 18 of the tank, and reference numeral 19 represents an air hole formed in the cover 10.

Since this conventional lid is constructed as described above, when the fuel in the tank is consumed and the pressure inside the tank becomes lower than that of the atmosphere, air passes through the minute gap between the cap 1 and the retainer 4 and is released from the air holes 7 and 11. The air that has reached the top surface of the diaphragm 9 pushes the diaphragm 9 downward, separating the closing line 14 from the valve seat plate 8, and the air that has passed through the air hole 13 enters the tank, smoothing the outflow of fuel from the tank. Make it.

When the internal pressure of the tank increases, the diaphragm 9 is pushed upward and the closing strip 14 comes into close contact with the valve seat plate 8, which closes the air hole 13 and prevents leakage to the outside due to the internal pressure of the tank. .

One of the disadvantages of conventional fuel tank lids constructed and operative in this manner is that the diaphragm 9 is complicated to manufacture.

That is, since the diaphragm 9 is molded thinly from rubber,
The wall thickness could not be made uniform, or it could become too thin, resulting in holes, resulting in poor yields, which was a bottleneck in producing this type of lid.

Furthermore, assembling the valve plate 15, spring 16, etc. is a troublesome work.

The present invention provides a fuel tank lid that functions similarly without using such a diaphragm and is easy to assemble.

FIG. 2 shows an embodiment of the lid of the present invention.

Portions equivalent to those of the conventional example shown in FIG. 1 are given the same reference numerals, and description thereof will be omitted.

The present invention is a modification of the structure of the diaphragm 9, cover 10, spring 16, etc. installed in the bracket 3 in the structure shown in FIG. An annular backing 21 is sandwiched between the stepped portion 3a of the bracket to maintain airtightness, and a valve 23 is attached to an air hole 22 in the center of the valve seat plate 20.

The valve 23 is provided with a thin support part 25 that hangs down like an umbrella at the upper end of a valve rod 24 that loosely fits into the air hole 22, an air hole 26 is bored in this, and a valve piece 27 is provided at the lower end of the valve rod 24. It was formed.

A closing protrusion 28 surrounding the air hole 22 is formed on the peripheral edge of the valve piece 27 toward the valve seat plate 20.

An annular backing 29 is inserted between the closing protrusion 28 and the valve seat plate 20 to improve airtightness.

This valve 23 is suitably molded from an elastic polyacetal resin, and by inserting the molded product from below the air hole 22 while constricting the support portion 25 and passing it through the hole, the valve seat is removed. It can be attached to the plate 20.

The effects of using the lid of the present invention are as follows.

Atmospheric pressure reaches the upper part of the valve 23 through the minute gap between the cap 1 and the retainer 4 through the air holes 7, 26, 22, but the elasticity of the support part 25 lifts the valve piece 27. The closing protrusion 28 is in close contact with the backing 29 to isolate the atmosphere from the inside of the tank.

When the pressure inside the tank becomes negative due to the use of fuel, the above valve piece 2
The atmosphere that has reached the upper part of the tank 7 elastically deforms the support part 25 and pushes down the valve piece 27 to separate the closing protrusion 28 and the backing 29, so that air enters the tank.

When the internal pressure of the tank increases, the valve piece 27 is pressed against the backing 29 to cut off communication between the air hole 22 and the inside of the tank, so that the internal pressure does not leak out of the tank.

Although the fuel tank lid of the present invention is constructed and operates as described above, it does not use the diaphragm 9, which is complicated to manufacture as in conventional lids, does not require the spring 16 or cover 10, and has a reduced number of parts. This makes manufacturing and assembly easier, which has a great effect on reducing production costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view illustrating a conventional fuel tank lid, and FIG. 2 is a longitudinal sectional view illustrating a fuel tank lid according to the present invention. 1: Cap, 2: Handle, 3 Nibble bracket, 3a:
Step part, 4: Retainer, 5, 6: Packing, 7: Air hole, 17: Projection, 20: Valve seat plate, 21: Annular backing, 22: Air hole, 23: Valve, 24: Valve rod, 25: Support Part, 26: Air hole, 27: Valve piece, 28: Closing ridge.

Claims (1)

[Scope of utility model registration request] A bracket 3 having a cylindrical lower part and a protrusion 17 protruding laterally is attached to the inner surface of the cap 1 to which the handle 2 is attached on the outer surface.
The retainer 4 and backings 5 and 6 are sandwiched between the cap 1 and the stepped portion 3a of the bracket 3, and an air hole 7 is bored at the base of the bracket 3 to communicate with the minute gap between the cap 1 and the retainer 4. Then, the valve seat plate 20 having the hole 22 is fitted onto the bracket 3, and the stepped portion 3a of the bracket is fitted.
The annular backing 21 is sandwiched between the ring-shaped backing 21 and the valve 23 is attached to the air hole 22. The valve 23 has an umbrella-shaped air hole 26 formed at the upper end of the valve rod 24 that loosely fits into the air hole 22. The lid of the fuel tank is provided with a supporting part 25, and a valve piece 27 having a closing ridge 28 surrounding the air (L22) is formed at the lower end of the valve rod 24 at the peripheral edge.