JPH04135826U - Fuel tank vent opening/closing device - Google Patents

Abstract

(57) [Summary] [Purpose] When refueling, the air passage to the canister is blocked to prevent the tank from filling up, and when driving, the air passage is opened.
Provides a ventilation opening/closing device for fuel tanks. [Structure] A fuel backflow prevention valve 3 is provided near the end of the fuel supply pipe 1 in the tank 2, and the backflow prevention valve 3 and the valve body of the ventilation opening/closing valve 5 to the canister 4 are connected to a spring material arm 9 or a stroke absorbing link 10. They are connected by a connecting means 6, so that the ventilation passage 7 is closed when the check valve 3 is open.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is designed to prevent the canister from being full (to prevent overfilling) when refueling. Regarding the fuel tank ventilation opening/closing device that blocks the ventilation path and opens it when driving. do.

0002

[Conventional technology]

Regarding the need to prevent vehicle fuel from dispersing into the atmosphere, This is an important matter as it relates to recent air pollution control regulations. In automobile fuel tanks, fuel evaporation increases due to temperature rise, and internal pressure increases. Power increases. The higher the pressure, the greater the risk of fuel vapor leaking out through permeation or outflow. becomes large, leading to not only fuel loss but also air pollution. Also, the internal pressure is high There is also an increased risk of fire in the event of a collision. Therefore, in order to release the excess steam to the canister, the ventilation between the tank and the canister is All that is needed is to reduce the road resistance and prevent the tank pressure from rising.

0003

[Problem that the idea aims to solve]

However, if the above condition occurs when refueling, the full tank regulation will no longer work. Full tank This can be achieved by closing the passage to the canister or by making the passage high resistance. Also, when driving, if the resistance of the path to the canister is low, the vehicle body may roll. If so, there is a risk that liquid fuel will flow into the canister. On the other hand, when the passage to the canister is closed to prevent the tank from filling up, the internal pressure of the tank increases. In some cases, there is a danger that fuel will blow back into the fuel filler port immediately after refueling. This invention attempts to simultaneously solve the above mutually contradictory problems. Ru.

0004

[Means to solve the problem]

In order to solve the above problem, in this invention, the ventilation opening/closing device of the fuel tank is changed to the tank 2 of the fuel supply pipe 1. Install the fuel check valve 3 near the inner end, and connect the check valve 3 and the canister 4. The valve body of the ventilation opening/closing valve 5 is connected with the connecting means 6, and the ventilation passage 7 is connected to the valve body of the ventilation opening/closing valve 5 by the connecting means 6. I tried to close it. Here, the ventilation opening/closing valve 5 is preferably a tilted closing type with a built-in ball 8 in a float type valve body 5a. A preferred embodiment of the connecting means 6 is a spring material arm 9 or a stroke absorbing link 10. Ru.

[0005]

[Effect]

The check valve 3 is closed when driving, and is opened by the flow of fuel when refueling. become a state. When the fuel flows backwards, the force closes the valve and the fuel is blown from the filler port. The canister passage opening/closing valve works together with the lever extending from the check valve. When the check valve opens, the passage is closed. Therefore, the pressure inside the tank cannot be released suddenly. It is possible to regulate the tank to be full when refueling.

[0006] In addition, when the car body rolls, the on-off valve opens and closes the ball that moves to close the passage. Since it is integrated into the valve, no liquid fuel will flow into the canister. The valve body of the on-off valve has a float function, so even when waves come into the air passage, Close the air passage to prevent fuel from flowing into the canister. Also, the fuel level may be too high. Since the on-off valve closes the ventilation path even when the tank is filled, it is possible to reliably control the tank to be full. In other words, the on-off valve Without the float function, refueling at a low flow rate when the tank is nearly full will always cause Since the air passage is open, any amount of fuel can enter the tank.

[0007] If this valve body 5a is provided with an orifice 5b that communicates with the liquid side, it will be possible to When the float is relaxed, liquid enters the float and the valve body descends, opening the valve and opening the canister. A passage to is opened. In addition, if the vent opening/closing valve 5 is closed when the tank internal pressure is high, the pressure with the vent passage 7 is Even if there is a force difference, the connecting means 6 closes the check valve 3 due to pressure or wave force. The vent opening/closing valve 5 is forcibly opened. This prevents the ventilation on-off valve 5 from opening. This phenomenon does not occur.

[0008]

【Example】

1 to 3 show a first embodiment of the present invention, and FIG. 1 is a side view of the main part broken away, and 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG. This device is installed at the upper end of the fuel supply pipe 1 connected to the fuel tank 2 inside the tank. A plate-shaped check valve 3 is provided which is pivotally supported. Also, the top of the tank is provided with a ventilation opening/closing valve 5 for the canister 4. This vent opening/closing valve 5 is located on the top surface. The valve case has a ventilation passage 7 on the bottom, has many ventilation holes on the bottom, and is the lowest in the center. A float type valve body 5a and a ball 8 are built into the ring 5c. The upper surface of the valve body 5a is Refice 5b is provided. Furthermore, there is a locking protrusion 5d near the top of the valve body 5a.

[0009] The locking protrusion 5d of the valve body 5a is used to connect the above-mentioned non-return valve 3 with the connecting means 6. I can stay. In this embodiment, one of the spring material arms 9 is located near the hinge portion 3a of the check valve 3. Fix the end, and make sure that the other end of the spring arm 9 engages with the locking protrusion 5d of the valve body 5a. It has become. As the name suggests, the spring material arm 9 is an elastic spring body, and is located near the valve body. is bifurcated and the middle part is bent to align the mounting position and provide effective elasticity. I try to do that. This allows the ventilation path 7 to close when the check valve 3 is open. The sea urchin is turning. In addition, the ventilation opening/closing valve 5 can be freely operated even when the vehicle body is rolling. Passages can be closed. If the vent opening/closing valve 5 is closed when the tank internal pressure is high, the pressure difference with the vent passage 7 will increase. This causes a phenomenon in which the vent opening/closing valve 5 does not open. In such cases, pressure or waves When the non-return valve 3 closes with the force of You will be kicked.

0010 FIG. 4 is a sectional view corresponding to FIG. 2 showing another embodiment. In this example, the connecting means 6 is It is characterized by 10 Rourke absorption links. In other words, the stroke absorption The link 10 engages with the link 10a connected to the check valve 3 and the locking protrusion 5d of the valve body 5a. It consists of a fork and a dogleg-shaped link 10b, and the link 10a and link 10b are Insert the former end perpendicularly into the hole 10c made in the latter end, and If the structure is such that they are connected using a compression spring 10d or a connecting means, the When the ventilation on-off valve 5 is closed, the pressure difference with the ventilation path 7 causes the ventilation on-off valve 5 to open. However, the connection is restored due to the action of the check valve 3 closing due to pressure or wave force. The vent opening/closing valve 5 is forcibly opened by the means 6. What uses a spring as a connecting means? The opening/closing stroke of the check valve is different from that of the ventilation opening/closing valve, so it is necessary to adjust it and to adjust the valve. This is because the closing force is set to be weaker than when the ventilation opening/closing valve 5 is closed by 8. be.

[0011]

[Effect of the idea]

Since the present invention has the above structure, it is possible to release excess steam to the canister. In addition, it is possible to reliably limit the tank to full when refueling. Furthermore, the car body is Liquid fuel does not flow into the canister even when the tank is ringed. This invention thus solves these mutually contradictory problems at the same time, and as a result, when refueling, The fuel tank is highly safe and prevents fuel leakage even when driving.

[Brief explanation of drawings]

FIG. 1 is a side view of the entire main part broken away.

FIG. 2 is an enlarged view of the main part of FIG. 1;

FIG. 3 is a sectional view taken along line A-A in FIG. 2;

FIG. 4 is a sectional view corresponding to FIG. 2 showing another embodiment.

[Explanation of symbols]

1 Fuel supply pipe 2 tank 3 Backflow prevention valve 4 Canister 5 Ventilation on/off valve 6 Connection means 7 Ventilation path 8 balls 9 Spring material arm 10 stroke absorption link

Claims (4)

[Scope of utility model registration request] Claim 1: A fuel backflow prevention valve 3 is provided near the end of the fuel supply pipe 1 in the tank 2, and the backflow prevention valve 3 and the canister 4 are connected to each other.
This vent opening/closing device for a fuel tank is constructed by connecting the valve body of a vent opening/closing valve 5 to the fuel tank with a connecting means 6 so that a vent passage 7 is closed when the check valve 3 is open. 2. The vent opening/closing device for a fuel tank according to claim 1, wherein the vent opening/closing valve 5 is of an inclined closing type with a ball 8 built into a float-shaped main body. 3. The fuel tank ventilation opening/closing device according to claim 1, wherein the connecting means 6 is a spring material arm 9. 4. The fuel tank ventilation opening/closing device according to claim 1, wherein the connecting means 6 is a stroke absorbing link 10.