JPH04115925U - vehicle fuel tank - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the fuel in the tank from spouting out from the injection port due to the pressure inside the tank when the cap of the injection port is opened when the fuel tank is near full. [Structure] A vent tube 13 that opens one end to the fuel-full position in the tank 10 and the other end to the cap-sealed position of the filler port 11, and a breather tube that opens the air chamber 16 inside the tank 10 to the atmosphere. 15. A valve 17 is installed on the breather tube 15, which closes when the cap 12 is opened and opens when the cap 12 is closed.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to improvements in vehicle fuel tanks.

0002

[Conventional technology]

For example, a fuel tank configured as shown in Figure 5 is well known as a vehicle fuel tank. ing. 2 is the fuel inlet of tank 1, and the cap that seals it when tightened. Equipped with 3. 4 has one end attached to the fuel-full position in tank 1, and the other end attached to the key of filler port 2. A vent tube that opens below the cap sealing position, 5 is an air chamber 6 in the upper part of the tank 1 This is a breather tube for releasing pressure to the atmosphere. A check valve 7 (pressure control valve) is interposed.

0003 When fuel is injected, a certain amount of fuel accumulates in the tank 1 and fills the injection port 2. When the liquid level reaches such a level that fuel enters the lower part, it enters the tank 1 through the vent tube 4. The liquid level rises further while expelling the air. Eventually, when the tank is full, the fuel The vent tube 4 is blocked by the liquid level, and the air has no place to escape, so the upper part of the tank 1 is A predetermined amount of air chamber 6 will remain.

0004 In addition, Utility Model Application Publication No. 62-137826, Publication No. 62-130932, etc. Related techniques have been proposed.

[0005]

[Problem that the idea aims to solve]

By the way, in this conventional example, check valve 7 in the middle of the breather tube is used to inject fuel. Since the pressure is set to create air chamber 6 when the tank is full, the temperature inside tank 1 will be As it rises, the fuel expands and the pressure in the air chamber increases, and in this state the cap closes. 3, the fuel in the tank 1 flows into the inlet 2 due to the reaction of the rising pressure in the air chamber 6. There was a possibility that it would erupt.

[0006]

[Means to solve the problem]

This idea solves this problem by tightening it on the fuel inlet. For vehicle fuel tanks that have a cap that seals, one end is connected to the fuel inside the tank. At the full tank position, insert a vent tube with the other end opening below the cap sealing position of the inlet. A breather tube is installed to open the air chamber at the top of the tank to the atmosphere. A valve is installed in the reaza tube that closes when the cap is opened and opens when the cap is closed. It is characterized by

[0007]

[Effect]

Opening the inlet cap closes the breather tube valve, allowing fuel to flow out. During injection, an air chamber can be left in the upper part of the tank as before. close the cap When the valve opens, the air chamber inside the tank has good ventilation through the breather tube. Therefore, in any case, the internal pressure of the tank is constant and fluctuates (increases). ), so even if you open the cap when the tank is full, fuel will spray out from the filler port. There's nothing wrong with that.

[0008]

【Example】

1 and 2, reference numeral 11 denotes a cap that opens and closes the fuel inlet of the tank 10. 12. 13 has one end at the full fuel position in the tank 10 and the other end at the fuel fill position. Bent hole opening below the sealing position of the packing 14 by the cap 12 of the mouth part 11 The tube 15 is a breather tube that opens the air chamber 16 of the tank 10 to the atmosphere. One end of the riser tube 15 is connected to the upper part of the tank 10, and the other end is connected to the valve 17. .

[0009] The valve 17 can slide into a valve chamber 18 integrally molded on the outer periphery of the upper end of the injection port 11. When the cap 12 is closed, the pin at the tip of the cock 19 will be removed. 20 is pushed by the cap 12, the cock 19 moves to the open position, and the cap 12 is opened. When opened, the cock 19 is returned to the closed position by the biasing force of the spring 21. Na In order to improve sealing, the sliding surfaces of the valve chamber 18 and the cock 19 are placed in the closing direction. A sloping taper is added. Also, the cap 12 has a bulge when the valve 17 is opened. A vent hole 22 is formed to open the user tube 15 to the atmosphere.

0010 With this configuration, when the cap 12 of the inlet part 11 is opened, the screen shown in FIG. As the valve 17 closes as shown above, the vent tube closes at the fuel level in the tank 10. 13 is blocked, the air in the tank 10 has nowhere to escape, so more fuel is required. It becomes impossible to inject. In other words, there is an air chamber 1 in the upper part of the tank 10 when the tank is full. You can leave 6.

[0011] When the cap 12 is closed, the valve 17 opens as shown in FIG. The air chamber 16 in the air chamber 10 has a breather tube 15 and a vent hole 22 in the cap 12. is opened to the atmosphere through the tank 10, so the pressure inside the tank 10 is constant in any case, Because it does not fluctuate (rise), even if you open the cap 12 when the tank is full, fuel will not flow into the inlet. No more gushing from 11.

0012 In FIG. 4, instead of forming a vent hole 22 in the cap 12, a vent hole 22 is formed at the end of the valve 17A. This is another example in which a tube 23 is connected to the top, making it compatible with vehicles with a canister. It becomes possible. Also, the valve 17A part is made into a separate unit from the inlet part 11. It can be used as a common item.

[0013]

[Effect of the idea]

In summary, according to this invention, the fuel injection port is sealed when tightened. For vehicle fuel tanks equipped with a cap, place one end in the tank at the full fuel position. In addition, there is a vent tube whose other end opens below the cap sealing position of the inlet, and a tank. A breather tube is installed to open the air chamber at the top of the tank to the atmosphere. We installed a valve in the cap that closes when the cap is opened and opens when it is closed. When closed, the valve opens and releases the breather tube, so the tank The pressure inside the tank is constant and does not fluctuate, so when the tank is full, open the cap. This provides the effect that fuel will not spout out from the injection port even if the fuel is heated.

[Brief explanation of drawings]

FIG. 1 is an overall view of a tank showing an embodiment of this invention.

FIG. 2 is a cross-sectional view of the main part when the cap is opened.

FIG. 3 is a sectional view of the main part when the cap is closed.

FIG. 4 is a perspective view of main parts showing another embodiment.

FIG. 5 is an overall view of a tank illustrating the prior art.

[Explanation of symbols]

10 Fuel tank 11 Inlet part 12 Cap 13 Vent tube 15 Breather tube 17 Valve

Claims (1)

[Scope of utility model registration request] Claim 1: In a fuel tank for a vehicle, the fuel inlet is provided with a cap that seals when the cap is tightened, with one end opening at a full fuel position in the tank and the other end opening below the cap sealing position of the inlet. A fuel tank for a vehicle, characterized in that the vent tube is provided with a vent tube that opens the air chamber at the upper part of the tank to the atmosphere, and the breather tube is equipped with a valve that closes when the cap is opened and opens when the cap is closed.