JPS6229411Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tiltable cap for an engine fuel tank.

[Conventional technology and its problems]

As is well known, in this type of fuel tank, the fuel in the tank is taken out from the outlet by a drop, but when taking out the fuel, in order not to create a negative pressure inside the tank, the fuel is passed through the cap. It has pores. However, if the fuel tank is tilted or vibrated, the fuel in the fuel tank may blow out from this vent, or air breather hole.
There is a problem with leakage. To deal with this, various proposals have been made. For example, as shown in FIG. 1, the outer periphery of an inner cover 2 is caulked to a cap body 1 to form a hollow chamber 3. The inner cover 2 is provided with a vent hole 4 that communicates with the fuel tank.
An air hole (not shown) is formed on the outer periphery of the fuel tank and a part of the inner periphery of the cap body 1, and the vent hole 4 and the air hole function as an air breather hole to prevent the fuel in the fuel tank from immediately blowing out to the outside. ing. In addition, 5 is a rivet 6 on the bottom surface of the inner cover 2,
Reference numeral 6 indicates a fixed spring plate piece, and reference numeral 7 indicates a spongy member.

However, even if the hollow chamber 3 is formed in this manner, the fuel once accumulated in the hollow chamber 3 leaks out due to the subsequent tilting of the fuel tank, rather than flowing down into the fuel tank chamber. Therefore, the hollow chamber 3 is further filled with a spongy member 7 to prevent its leakage.

However, if the fuel tank is tilted for a long time, the fuel in the fuel tank will be actively drawn out into the hollow chamber 3 due to the capillary action of the spongy member 7, and the spongy member 7 will cause a breather effect. Although this has been done, it has the disadvantage that the timing of fuel leakage is accelerated.

Further, Japanese Utility Model Application Publication No. 50-126648 proposes that the spongy member 7 is pressed by a stepped bottomed cylindrical body forming a large circular space and a small circular space.

However, in such a proposal, the spongy member 7 is surrounded by the inner cover and the bottomed cylindrical body, and the breather action is not performed well, and the flow of fuel into the fuel tank is slow. Since it uses a cylindrical body with a bottom, there is a disadvantage that the entire cap becomes bulky.

[Means for solving problems]

Therefore, the present invention was devised in order to eliminate the disadvantages of the prior art, and it prevents leakage of fuel from the fuel tank as much as possible even if the fuel tank of the engine is tilted for a long time, and also prolongs the breather action. It is intended to last for a long time.

Hereinafter, the configuration of the present invention will be described in detail using examples.

2 is a sectional view of an embodiment of the present invention, and FIG. 3 is a plan view taken in the direction of arrow A in FIG.
Then, the outer periphery of the inner cover 2 is bent inward and caulked with a substantially flat partition plate 9 interposed therebetween.
First, a hollow chamber 3 and an upper chamber 10 communicating with the ventilation hole 4 are formed.

The inner cover 2 is provided with ventilation holes 4, 4 that communicate with the fuel tank body (not shown in FIG. 2),
A spring plate piece 5 is attached to the lower surface of the inner cover 2 and fixed with rivets 6, 6. The inner cover 2 is formed into a bowl shape as in the conventional example, and a spongy member 7 is placed on the bottom of the inner cover 2, and a disc-shaped presser plate 8 is pressed from above, and this presser plate 8 is also They are fastened together with rivets 6, 6, and the outer peripheral side of the spongy member 7 is free, and the free part is fixed to the partition plate 9 so as not to come into contact with it. That is, the size of the presser plate 8 is determined by the size of the presser plate 8.
The vent holes 4, 4 are sized so that they are not covered, and communicate with the hollow chamber 3 through the free spongy member 7.

The inner cover 2 and the partition plate 9 are in close contact with each other with a sheet rubber 11 interposed therebetween, and a part of the outer periphery of the partition plate 9 having small holes (not shown) is waved to form a communication groove 12. The communication groove 12 communicates with the gap (which leads to the outside and corresponds to the air hole) formed between the fuel tank body and the cap body 1 to perform a breather action. .

In this embodiment configured as above,
Attach the rubber gasket 13 attached to the cap body 1 to the supply port of the fuel tank body,
The cap body 1 is attached using the spring plate piece 5.
When a small gasoline engine equipped with this fuel tank is mounted on an agricultural management machine to perform field management work, the fuel tank is tilted all the time, so the fuel can flow freely through the lower vent hole 4. Although the fuel permeates into the spongy member 7, since it has the gap B, the spongy member 7 does not come into contact with the partition plate 9, and even if the fuel that has permeated into the gap B remains in the hollow chamber 3, There is no leakage into the upper chamber 10. In other words, even if the fuel tank is tilted, fuel will not leak to the outside.
When the agricultural management machine is returned to its normal position, the fuel accumulated in the gap B, that is, the hollow chamber 3, will gradually flow down into the fuel tank, and the breather effect of fuel consumption during engine operation will be normalized. It will be done.

[Effect of idea]

In summary, the present invention has the following effects because it adopts the structure described in the claims for utility model registration.

That is, even if the fuel tank is tilted for a certain period of time and fuel temporarily accumulates in the gap B between the porous member 7 and the partition plate 9, it does not leak into the upper chamber 10, and the period of leakage to the outside is extended. Moreover, since the breather action continues, it does not interfere with engine operation, and the fuel tank and hollow chamber 3 are communicated through the porous member 7 which is in a free state. , without sealing some of the many vent holes 4, the flow of fuel and the breather effect are performed well, and the leakage of fuel is prevented.In addition, there is no guide to the upper chamber 10 due to the gap B. Moreover,
Since the substantially flat partition plate 9 is adopted, the entire cap does not have to be bulky.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is a plan view taken in the direction of arrow A in FIG. 1...Cap body, 2...Inner cover,
3... Hollow chamber, 7... Spongy member, 9... Partition plate, 10... Upper chamber.

Claims (1)

[Scope of Claim for Utility Model Registration] A bowl-shaped inner cover 2 in which a large number of ventilation holes 4 are provided in the cap body 1 and communicate with the fuel tank chamber.
In the cap for an engine fuel tank, which has a porous member 7 fixed on its outer periphery and a porous member 7 attached above the vent hole 4, a substantially flat inner cover is provided between the cap body 1 and the inner cover 2. A hollow chamber 3 that first communicates with the ventilation hole 4 through a partition plate 9 and an upper chamber 10 are formed, and the upper chamber 10 is communicated with the outside. The porous member 7 on the side is pressed and fixed with a press plate 8, and the vent hole 4 and the hollow 3 are communicated through the free part of the porous member 7 that is not pressed. A tiltable cap for an engine fuel tank in which a gap B is formed between the free part and the partition plate 9.