JPH094532A - Fuel gas ejector - Google Patents

Abstract

PURPOSE: To provide a fuel gas ejector which is simple in its structure and manufactured at low cost as well as to prevent a lowering of sealing property. CONSTITUTION: This ejector is equipped with a fuel gas escape pipe 21 which is positioned on the top of a fuel tank 12 and communicated with a canister, a float valve 23 by which the escape pipe 21 is disconnected by the increment of a liquid level in the fuel tank 12, a retainer 24 positioned on the lower surface of the float valve 23, first energizing means 25 by which the retainer 24 is energized toward the lower surface of the float valve 23, and moving means 28 by which the retainer 24 is moved in a valve opening direction when fuel is supplied.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Fuel gas produced by vaporizing a part of gasoline used as automobile fuel is a cause of air pollution if it is released into the atmosphere as it is during refueling. Therefore, a canister for temporarily storing the fuel gas in the vehicle is provided, and the fuel gas is finally supplied to the engine and burned.

According to the present invention, the exhaust valve in the fuel tank is always closed, and the exhaust valve is mechanically opened only when refueling, so that the fuel gas in the fuel tank is passed through the escape pipe. The present invention relates to a fuel gas discharge device that allows a canister to escape.

[0003]

2. Description of the Related Art As a conventional technique of this kind, an actual fairness 6
The technique disclosed in Japanese Patent Laid-Open No. 11211 is known.
This is a fuel gas escape pipe leading to the canister on the top surface of the fuel tank, an escape valve for opening and closing the escape pipe, and a second valve communicating with the valve seat of the escape valve due to the rise of the liquid level in the fuel tank. A float valve for closing the seat is provided, and the escape valve is opened when the fuel supply gun is inserted into the fuel supply pipe to the fuel tank.

[0004]

In the above-mentioned prior art, since two valves are arranged in one fuel gas discharge device, the structure is complicated, the number of parts is large, and the cost is high. Further, when the fuel is not full, the float valve is in a free state, so that the float valve moves due to the vibration during traveling of the vehicle, the float valve collides with the second valve seat, and the valve seat portion is damaged. There is a problem that the sealability is impaired.

A technical object of the present invention is to provide a fuel gas discharge device having a simple structure and a low cost structure while preventing the deterioration of the sealing property.

[0006]

In order to solve the above technical problems, the technical measures taken in the invention of claim 1 are the fuel gas escape pipe which is located on the top surface of the fuel tank and communicates with the canister, and the fuel. A float valve that shuts off the escape pipe due to the rise of the liquid level in the tank, a retainer located on the lower surface of the float valve, a first biasing means that biases the retainer toward the lower surface of the float valve, and during fuel supply. And a moving means for moving the retainer in the valve opening direction.

In order to enable the float valve to more reliably block the escape pipe, the technical means provided in the invention of claim 2 is arranged between the float valve and the retainer.
The second urging means has a weaker urging force than the first urging means and can lift the float valve only when buoyancy acts on the float valve.

[0008]

In the first aspect of the invention, when the retainer is moved in the valve opening direction of the float valve by the moving means during refueling, the float valve opens and the escape pipe communicates. This causes the vaporized fuel gas to flow out through the escape pipe to the canister. When the fuel in the fuel tank approaches full, the float valve shuts off the escape pipe by its own buoyancy. As a result, the fuel gas does not flow out to the canister side. When the refueling is finished, the retainer moves the float valve in the direction of blocking the escape pipe by the urging force of the first urging means.

According to the second aspect of the invention, when the fuel in the fuel tank approaches the full tank at the time of refueling and the float valve shuts off the escape valve, the float valve has its own buoyancy and the second urging means. The escape tube can be blocked by the biasing force.

[0010]

EXAMPLE An example according to the present invention will be described.

FIG. 1 is a partial cross-sectional view of a fuel tank adopting the fuel gas discharge device of this embodiment, FIG. 2 is a front view of the fuel gas discharge device of this embodiment, and FIG. 3 is a fuel gas discharge device of this embodiment. FIG. 4 is a cross-sectional view showing a state in which the escape pipe is blocked, and FIG. 4 is a cross-sectional view showing a state in which the escape pipe of the fuel gas discharge device of this embodiment is in communication.

In the figure, the tip of the supply pipe 10 constitutes a fuel supply port 11, and the base end is integrally fixed to a fuel tank 12. 2 to the top of the fuel tank 12.
The fuel gas discharge device 20 shown in FIG.
3 is fixed.

The fuel gas discharge device 20 includes the escape pipe 2
1 is composed of a housing 22, a float valve 23, a retainer 24, first and second springs 25 and 26 constituting first and second biasing means, a bottom plate 27, and a moving means. There is. The escape pipe 21 is connected to a canister (not shown). On the peripheral surface of the housing 22,
A plurality of holes 22a through which fuel gas can pass, a plurality of elongated holes 22b through which the locking portions 27a of the bottom plate 27 can be locked, and projections 22c and 22d for fitting the seal member 13 are provided.

The float valve 23 is made of a material having fuel oil resistance such as polyacetal or polybutylene terephthalate, and is capable of sliding a rib 22e formed on the inner peripheral surface of the housing 22 in the vertical direction in the figure. Has become. An annular elastic body 23d is fitted on the upper surface of the float valve 23, and the sealing performance is improved when the upper surface of the float valve 23 comes into contact with a valve seat 22f provided on the inner peripheral surface of the housing 22. It is like this. On the lower surface of the float valve 23, a column 23b having a plurality of ribs 23a is provided. Further, a plurality of groove portions 23c are formed on the lower surface of the float valve 23.

A retainer 24 is provided on the lower surface of the float valve 23.
Are arranged. A plurality of through holes 24 a are formed in the retainer 24. The center of the retainer 24 is
A cylindrical protrusion 24b is formed, and the lower end of the second spring 26 is positioned on the upper surface and the upper end of the first spring 25 is positioned on the lower surface.

The urging force of the first spring 25 is set stronger than that of the second spring.

The second spring 26 is provided so that the float valve 23 cannot be lifted when buoyancy is not acting on the float valve 23, and conversely the float valve 23 can be lifted when buoyancy is acting on the float valve 23. You should set the power. The lower end of the first spring 25 is positioned on the boss portion 27a of the bottom plate 27. On the other hand, the upper end of the second spring 26 is connected to the column 23 of the float valve 23.
It is positioned on the rib 23a of b.

Like the retainer 24, the bottom plate 27 has a plurality of through holes 27b.

A plurality of locking portions 27c are provided on the outer periphery of the bottom plate 27.
Are formed. A hole 27d is formed in the central portion of the bottom plate 27 so that the lower end of the first spring 25 can be positioned and the wire 28 that constitutes one member of the moving means can pass through.

The moving means is a wire 28 and a lever 29.
And a support plate 30 and a swing plate 31.
One end of the wire 28 is hooked on the lower surface of the retainer 24, and the other end is attached to the lever 29. The lever 29 is rotatably attached to the support plate 30 by a pin 32, and further attached to the swing plate 31 by a connecting rod 33. The swing plate 31 is attached to the support plate 30 so as to swing about a pin 34.

Next, the operation of this embodiment will be described.
At the time of refueling, when the fuel refilling gun (not shown) is opened to insert the fuel refilling gun (not shown) into the refilling tube 10 and the fuel refilling gun is inserted, the tip of the fuel refilling gun pushes the oscillating plate 31 and the oscillating plate 31 Rock. Then, the wire 28 is pulled via the lever 29, and the retainer 24 is moved downward in the figure.

As a result, the retainer 24 moves against the biasing force of the first spring 25.

At this time, since the float valve 23 has no buoyancy, the second spring 26 cannot lift the float valve 23, and the retainer 24 moves downward and the float valve 23 also moves downward.

As a result, the fuel gas vaporized in the fuel tank 12 flows out to the canister (not shown) through the escape pipe 21, and the atmospheric pressure in the fuel tank 12 can be lowered, and the fuel is supplied from the fuel supply gun. Is replenished. When the fuel in the fuel tank 12 approaches full tank and buoyancy acts on the float valve 23, the float valve 23 is moved upward by its own buoyancy and the urging force of the second spring 26, and the upper surface of the float valve 23 is The escape pipe 21 is shut off when it comes into contact with the valve seat 22f.

When the fuel supply is completed and the fuel supply gun is removed from the supply pipe 10, the swing plate 31 and the lever 29 are returned to their initial positions, and the retainer 24 is moved upward by the urging force of the first spring 25. And contacts the lower surface of the float valve 23.

Although the moving means of this embodiment moves the retainer 24 downward by inserting the fuel supply gun,
The present invention is not particularly limited to this, and there is no problem even if it is configured to interlock with a device that opens the supply port 11.

As described above, in this embodiment, since the escape pipe 21 can be communicated with and blocked by only one valve (float valve 23), the structure can be simplified,
It is of low cost. Further, except when the fuel is being replenished, the float valve 23 blocks the escape pipe 21 by the urging force of the first spring 25, so that the collision between the float valve 23 and the valve seat 22f due to the traveling vibration of the vehicle can be prevented. It is possible to prevent the deterioration of the sealing property. Further, when the fuel in the fuel tank 12 approaches the full tank at the time of refueling and the float valve 23 shuts off the escape valve 21, the float valve 23 is evacuated by its own buoyancy and the urging force of the second spring 26. 21 can be shut off.

[0028]

According to the first aspect of the invention, since the escape pipe can be communicated with and cut off by only one valve, the structure can be simplified and the cost can be reduced. Further, except when the fuel is being replenished, the float valve shuts off the escape pipe by the urging force of the first urging means, so that the valve and the valve seat collide with each other due to the traveling vibration of the vehicle, and the sealing performance deteriorates. Can be prevented.

According to the second aspect of the present invention, when the fuel in the fuel tank approaches the full tank at the time of refueling and the float valve shuts off the escape valve, the float valve has its own buoyancy and the second urging means. The escape tube can be blocked by the biasing force.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a fuel tank that employs a fuel gas discharge device according to this embodiment.

FIG. 2 shows a front view of the fuel gas discharge device of the present embodiment.

FIG. 3 is a sectional view showing a state in which the escape pipe of the fuel gas discharge device of this embodiment is cut off.

FIG. 4 is a sectional view showing a state in which the escape pipes of the fuel gas discharge device of this embodiment are in communication with each other.

[Explanation of symbols]

 12 ... Fuel tank 20 ... Fuel gas discharge device 21 ... Escape pipe 22 ... Housing 22f ... Valve seat 23 ... Float valve 24 ... Retainer 25 ... First spring (First urging means) 26 ... Second spring (second urging means) 27 ... Bottom plate 28 ... Wire (moving means) 29 ... Lever (moving means) 30 ... Support plate (Moving means) 31 ... Oscillating plate (moving means)

Claims (2)

[Claims] 1. A fuel gas escape pipe located on the top surface of a fuel tank and communicating with a canister; a float valve that shuts off the escape pipe by raising the liquid level in the fuel tank; and a bottom surface of the float valve. A fuel including: a retainer positioned; a first urging unit that urges the retainer toward the lower surface of the float valve; and a moving unit that moves the retainer in the valve opening direction when fuel is supplied. Gas release device. 2. The float valve is arranged between the float valve and the retainer, and the float valve can be lifted only when the biasing force is weaker than that of the first biasing means and the buoyancy acts on the float valve. A fuel gas discharge device comprising a second urging means.