JPH067954Y2 - Fuel gas emission control device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) Fuel gas produced by vaporizing a part of gasoline used as automobile fuel is considered to be a cause of polluting the atmosphere if it is released into the atmosphere as it is during refueling. Become. Therefore, the vehicle is equipped with a canister that temporarily stores the fuel gas, and the fuel gas is finally supplied to the engine and burned.

The present invention constantly closes the exhaust valve in the fuel tank and opens the exhaust valve mechanically only when refueling, so that the fuel gas in the fuel tank is discharged to the outside of the tank and replenished. The present invention relates to a fuel gas discharge control device configured to return a discharge valve to a closed position by a float at the same time when a liquid level of fuel to be discharged becomes constant.

(Prior Art) When refueling a fuel tank, it is necessary to discharge the fuel gas in the fuel tank, which is compressed by the refueling fuel from the refueling gun, to the outside of the fuel tank. Therefore, a solenoid valve system is proposed in which a fuel gas escape pipe and an escape valve for opening and closing the escape pipe are provided on the top surface of the fuel tank, and the escape valve is opened by a signal for sensing refueling.
As a sensor to detect refueling, it is supposed to provide a sensor that operates by the movement of the hinge part of the small door that covers the refueling port and is pivotally supported on the body so that it can be opened and closed. It lacks, and it has the drawback that it is difficult to determine the sensor to detect refueling, and the cost is high.

(Problems to be solved by the present invention) In view of the above, the present invention floats when the fuel tank is filled with fuel and the liquid level rises by opening the discharge valve by mechanical interlocking in association with refueling. It is intended to develop a structure for returning the discharge valve to the valve position for closing.

(Means for Solving Problems) The present invention is intended to solve the problems described in the preceding paragraph, and a fuel gas discharge pipe and a discharge for opening and closing the discharge pipe at the head of a fuel tank. And a valve rod of the discharge valve is supported by a valve receiving rocking plate capable of rocking,
A support member is provided for supporting the valve receiving rocking plate by the elastic force of a spring whose lower end is hung on a fixed portion to bring the discharge valve to a closed position, and the fuel tank is provided below the rocking end of the valve receiving rocking plate. A float, which floats when the liquid surface of the fuel rises and pushes up the rocking end portion, is provided, and a rocking plate that is pushed and rocks by the insertion of the fuel supply gun provided in the supply pipe and the support member are The present invention relates to a fuel gas release control device characterized in that a discharge wire is swingable to an open position at the time of replenishment and is connected by a flexible wire passing through a fuel tank.

A preferred embodiment of the present invention will be described in the next section.

(Embodiment) The accompanying drawings show an embodiment of the present invention, in which a refueling pipe 2 is projected into a fuel tank 1 and a refueling port 3 of the refueling pipe 2 can be easily inserted from a vehicle body outside to supply a refueling gun a. To the position.

As shown in FIGS. 1 and 2, a starting portion of a fuel gas discharge pipe 4 is inserted into the top of the fuel tank 1, and a discharging valve support 5 having a fuel gas permeation hole 6 is fitted to the starting end portion. A valve seat 7 communicating with the discharge pipe 4 is provided in the valve seat 7, and the valve rod 10 of the discharge valve 9 is slidably passed through the tubular portion 8 to allow the discharge valve 9 to move to the valve seat 7
Correspond to be able to approach and separate.

The exhaust pipe 4 leads to a charcoal canister (not shown), and finally supplies it to the engine together with the fuel in the fuel tank 1 supplied by the fuel pump.

Reference numeral 11 is a bracket attached to the inner surface of the top of the fuel tank 1, and a valve receiving rocking plate for supporting the lower end of the valve rod 10 by a shaft 12 at a position roughly aligned with the lower end of the valve rod 10 protruding downward from the tubular portion 8. 13 is pivotally supported on the swing end of the plate. The leg 14 bent into a shape is attached, and the float pressure receiving portion 15 is provided at the lower end of the leg 14. Reference numeral 11a denotes a spring support plate obtained by bending the bracket 11 horizontally below the valve receiving rocking plate 13,
A through hole is provided in the central portion, the lower end of the coil spring 16 is hooked with the upper surface thereof as a fixed portion, and the loosely fitted support member 17 engaged with the upper end of the spring 16 is engaged with the lower surface of the valve receiving rocking plate 13. Then
The discharge valve 9 is elastically contacted with the valve seat 7 through the support member 17, the valve receiving rocking plate 13 and the valve rod 10 by the elasticity of the coil spring 16 to close the discharge pipe 4.

The support member 17 slightly projects downward from the through hole of the spring support plate 11a. A mounting piece 18 is hung from a lower portion of the spring support plate 11a, an outer cable 20 is fixed to the mounting piece 18, and a flange 19a at an upper end of the inner wire 19 is passed through the inside of the support member 17. Further, a perforated float support plate 21 having a U-shaped cross section is attached to the attachment piece 18, and the float 22 is housed in the support plate 21.

As shown in FIGS. 3 and 5, the supply port 3 of the supply pipe 2 has a funnel shape in which a fuel supply gun a can be inserted, and a supporting plate 26 which is substantially parallel to the supply pipe 2 is attached to the lower surface side. The shaft 27 at the upper portion of the support plate 26 causes the fuel supply gun a of the supply port 3a.
An oscillating plate 28 for closing the opening 25 through which it passes is pivotally supported, and further, a shaft 29 of an intermediate portion of the support plate 26 pivotally supports the center of the lever 30 in the longitudinal direction, and the fuel tank 1 is attached to the lower end of the support plate 26. The inner wire 1 which fixes the outer cable 20 passed through the inside and pulls out from the outer cable 20
9 is axially connected to the swing lower end of the lever 30 shown in FIG. 5, and the swing upper end of the lever 30 shown in FIG.

(Operation) In the present invention, when the fuel supply gun a is inserted from the supply port 3 of the supply pipe 2 as shown in FIG. 5, the swing plate 28 is pushed and swings, and the lever 30 is swung to move the inner wire 19 to the inner wire 19. To pull
As shown in FIG. 4, the supporting member 17 is lowered by the wire 19 and the coil spring 16 is compressed, so that the valve receiving rocking plate 13
The valve rod 10 and the discharge valve 9 supported by the plate 13 are lowered to open the valve seat 7, and the inner space of the fuel tank 1 and the discharge pipe 4 is made to communicate with each other. Is discharged from the discharge pipe 4.

When the liquid level W of the fuel tank 1 rises due to this refueling and the float 22 is floated, the valve receiving rocking plate 13 rocks as shown in FIG. 4, raising the valve rod 10 and moving the discharge valve 9 to the fourth position. The discharge pipe 4 is closed by bringing it into contact with the valve seat 7 as shown by the chain line and the solid line in FIG. Further, when the fuel supply gun a is pulled out from the supply pipe 2 and the supply port 3, the swing plate 28 and the lever 30 are moved back as shown in FIG. 16 is extended, and a support member 17 is attached to the lower surface of the valve receiving rocking plate 13 that has already returned.
Even if the liquid level W of the fuel drops, the discharge valve 9 does not open until the next refueling.

(Effect) The present invention inserts the refueling gun a into the refueling port 3 of the refueling pipe 2 and pushes the oscillating plate 28. The flexible wire (the inner wire 1) passed through the fuel tank 1 is directly related to the mechanical operation.
9) to lower the support member 17 against the elastic force of the coil spring 16 and swing the valve receiving rocking plate 13 to lower the valve rod 10 supported by the plate 13 to cause the discharge valve 9 Is opened and the fuel gas in the fuel tank 1 is discharged from the discharge pipe 4, and refueling and opening of the discharge valve 9 can be directly related by mechanical interlocking with a flexible wire. First, before refueling the fuel tank 1, the liquid level W rises, and when the fuel cannot be further refueled, the float 22 is levitated by the liquid level W and before the fuel refilling gun a is pulled out from the refill port 3, first. The valve receiving oscillating plate 13 is returned to cause the discharge valve 9 to close, and the gun a
And the supporting member 17 is supported on the flexible wire by the extension of the coil spring 16 to support the valve receiving oscillating plate 13 at the returning position, and even if the liquid level W is lowered after that, the discharge pipe is used until the next refueling. Since the valve 4 is not opened to communicate with the inner space of the fuel tank 1, the discharge valve is opened every time fuel is replenished, and the float 22 immediately closes when the liquid level W rises by refueling. It has the effect of being controllable by a single discharge valve 9.

[Brief description of drawings]

The attached drawings show an embodiment of the present invention. Fig. 1 is a cutaway side view of the entire device, Fig. 2 is a vertical side view of a portion of a discharge valve 9, and Fig. 3 is a supply pipe 2 provided with a swing plate 29. Cutting side view, 4th
FIG. 5 is a vertical sectional side view showing opening of the discharge valve 9 of FIG.
The figure is a vertical cross-sectional side view of the fuel supply gun a with the supply port 3 and the supply pipe 2 inserted. 1 ... Fuel tank, 2 ... Supply pipe, 3 ... Supply port 4 ... Discharge pipe, 7 ... Valve seat, 9 ... Discharge valve 10 ... Valve rod, 13 ... Valve receiving rocking plate 16 ... … Coil spring, 17… Supporting member 19… Inner wire 20… Outer cable, 22… Float 28… Oscillating plate, 30… Lever 31… Link rod

Claims (1)

[Scope of utility model registration request] 1. A fuel gas discharge pipe and a discharge valve for opening and closing the discharge pipe are provided on a head of a fuel tank, and a valve rod of the discharge valve is supported by a valve receiving rocking plate capable of rocking. A support member for pressing the discharge valve to the closed position by engaging with the valve receiving rocking plate is provided, and is floated up below the rocking end of the valve receiving rocking plate due to the rise of the fuel liquid level of the fuel tank. A float that pushes up the swinging end portion is provided, and the swinging plate that is pushed and swings by the insertion of the fuel supply gun provided in the supply pipe is connected to the above-mentioned support member, and at the time of fuel supply, the valve A fuel gas discharge control device comprising a flexible wire for releasing the engagement between a swing plate and the support member and swinging the discharge valve to a valve open position.