JPH0444425Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a fuel tank for vehicles, particularly for automobiles.

[Conventional technology]

Vehicles driven by internal combustion engines are usually equipped with a fuel tank, and when the fuel in the fuel tank becomes low, the cap attached to the fuel inlet of the fuel tank is removed and the fuel nozzle is inserted into the fuel inlet to fill the fuel tank. Fuel is injected into the fuel tank from the fuel nozzle. However, when the fuel in the fuel tank becomes low, the upper space above the fuel level in the fuel tank is filled with a large amount of pressurized fuel vapor, so the fuel is pumped into the fuel tank by the fuel supply nozzle. As the fuel ejected from the fuel supply nozzle during injection accumulates in the fuel tank, a problem arises in that fuel vapor flows out from the fuel injection port into the outside air and pollutes the atmosphere.

To solve this problem, a normally closed on-off valve that opens when the fuel supply nozzle is inserted is rotatably placed inside the fuel injection pipe to control the flow of fuel vapor from the fuel tank to the fuel vapor purification device. A fuel tank for a vehicle is known in which a closed type control valve is disposed in a fuel injection pipe, and when the on-off valve opens, the control valve is opened to send fuel vapor in the fuel tank to a fuel vapor purification device. (Refer to Japanese Utility Model Application Publication No. 61-90624).

Furthermore, a normally closed on-off valve that opens when the fuel supply nozzle is inserted is rotatably arranged inside the fuel injection pipe.
A normally closed control valve that controls the fuel vapor flow from the fuel tank to the fuel vapor purification device is rotatably arranged in the fuel injection pipe, and the control valve is opened when the on-off valve is opened. The present applicant has already proposed a vehicle fuel tank in which fuel vapor therein is sent to a fuel vapor purification device (see Utility Model Application No. 169614/1983).

[Problem that the invention attempts to solve]

However, the cross-sectional area of the fuel injection pipe is small, and therefore, when a control valve is disposed within the fuel injection pipe in addition to the on-off valve, there is a problem in that it is actually quite difficult to install the control valve. Furthermore,
The on-off valve must be arranged so as not to interfere with the fuel supply nozzle inserted into the fuel injection pipe, and thus there is a problem in that the fuel vapor flow area of the control valve cannot be made sufficiently large.

[Means for solving problems]

According to the present invention, in order to solve the above problems,
A flat plate-shaped normally closed on-off valve that opens when the fuel supply nozzle is inserted is rotatably placed inside the fuel injection pipe.
A valve housing is attached to the outer wall of the fuel injection pipe, and a normally closed control valve for controlling the flow of fuel vapor from the fuel tank to the fuel vapor purification device is disposed within the valve housing, and a control rod is connected to the valve body of the control valve. protrudes into the fuel injection pipe in a direction substantially perpendicular to the axis of the fuel injection pipe, and the opening/closing valve portion that comes into contact with the control rod when the opening/closing valve is opened is formed from an inclined surface extending at an angle with respect to the flat opening/closing valve. The control rod is brought into contact with this inclined surface at a nearly right angle, and when the on-off valve opens, the control rod is moved in the axial direction to open the control valve, thereby removing the fuel vapor in the fuel tank. is sent to the fuel vapor purification system.

〔Example〕

Referring to Figures 1 and 2, 1 is a fuel injection pipe of the fuel tank, 2 is a fuel injection port, 3 is a cap screwed onto the fuel injection port 2, and 4 is a cap formed inside the fuel injection port 2. The guides for the fuel refueling nozzles on the funnel are shown respectively. A bracket 5 is fixed to the outer wall surface of the guide 4, and a rotating shaft 6 is rotatably supported by the bracket 5. An on-off valve 8 for controlling opening and closing of the opening 7 of the guide 4 is fixed on the rotation shaft 6, and a coil spring 9 is inserted around the rotation shaft 6. One end of the coil spring 9 is hooked to the on-off valve 8, and the other end of the coil spring 9 is hooked to the bracket 5.
The on-off valve 8 is always urged in the valve-closing direction by the coil spring 9, and therefore, the on-off valve 8 normally closes the opening 7 of the guide 4, as shown in FIG.

On the other hand, a valve housing 1 is provided on the outer wall of the fuel injection pipe 1.
0 is attached. Inside this valve housing 10, there is a fuel vapor inflow chamber 11, a fuel vapor outflow chamber 12,
A valve port 13 is formed to communicate the inflow chamber 11 and the outflow chamber 12, and a control valve 14 for controlling opening and closing of the valve port 13 is disposed within the fuel vapor outflow chamber 12. This control valve 14 includes a hemispherical valve body 15,
Valve body support rod 16 integrally formed with valve body 15
and a control rod 17 connected to a valve body 15, the control valve 14 being axially slidably supported within the valve housing 10. A compression spring 18 is inserted between the valve body 15 and the valve housing 10, and the spring force of the compression spring 18 causes the valve body 15 to be compressed.
is always urged toward the valve port 13. The control rod 17 protrudes into the fuel injection pipe 1 in a direction substantially perpendicular to the axis of the fuel injection pipe 1, and the tip end 17a of the control rod 17 is opened when the on-off valve 8 is opened, as shown in FIG. It is arranged so as to be in contact with the on-off valve 8. The on-off valve 8 has an abutment surface 19 that is substantially perpendicular to the axis of the control rod 17 and abuts against the control rod tip 17a. In the embodiment shown in FIGS. 1 and 3, a recess 20 having a bottom wall surface inclined with respect to the flat valve body 8a of the on-off valve 8 is formed, and the bottom wall surface of this recess 20 forms the contact surface 19. . On the other hand, in the embodiment shown in FIG. 4, a bracket 21 having an inclined part 21a inclined with respect to the flat valve body 8a is fixed to the on-off valve 8, and the inclined part 21a of this bracket 21 comes into contact with the control rod 17. Form a tangent surface.

A fuel vapor inflow pipe 22 is connected to the fuel vapor inflow chamber 11 formed in the valve housing 10, and a fuel vapor outflow pipe 23 is connected to the fuel vapor outflow chamber 12. As shown in FIG.
2 is connected to the upper space of the fuel tank 24, and the fuel vapor outflow pipe 23 is connected to a fuel vapor purification device, for example, a canister 25 containing activated carbon. Note that the fuel vapor outflow pipe 23 is connected to the canister 25.
It is also possible to connect directly to the engine intake duct (not shown) without going through the internal combustion engine, in which case the internal combustion engine forms a fuel vapor cleaning device.

As mentioned above, the opening 7 of the guide 4 is normally closed by the on-off valve 8. At this time, the valve port 13 in the valve housing 10 is closed by the valve body 15. Therefore, at this time, the fuel tank 24
The fuel vapor inside cannot escape to the canister 25, and thus the inside of the fuel tank 24 is filled with fuel vapor.

At the time of fuel injection, the cap 3 is removed, and then the fuel supply nozzle 26 is inserted into the fuel injection pipe 1 from the fuel injection port 2, as shown in FIG. At this time, the tip of the fuel supply nozzle 26 comes into contact with the on-off valve 8, and as shown in FIG. 1, the on-off valve 8 rotates to open the opening 7 of the guide 4. When the on-off valve 8 is opened, the contact surface 19 of the on-off valve 8 comes into contact with the control rod tip 17a, and as a result, the control rod 17 is moved to the right in FIG. Therefore, at this time, the valve body 15 opens the valve port 13, and thus the fuel vapor in the fuel tank 24 is sent into the canister 25 via the fuel vapor inlet pipe 22 and the fuel vapor outlet pipe 23. Fuel supply nozzle 26
When the supply of fuel is started, this fuel collides with the fuel in the fuel tank 24, causing the fuel to bubble, thereby generating fuel vapor. This fuel vapor also has a fuel vapor inflow pipe 22 and a fuel vapor outflow pipe 2.
3 into the canister 25. When the fuel filling operation is completed, the fuel filling nozzle 26 is pulled out from the fuel injection pipe 1. At this time, both the on-off valve 8 and the control valve 14 are closed. Therefore, all the fuel vapor generated in the fuel tank 24 is sent into the canister 25, so that the fuel vapor in the fuel tank 24 can be prevented from flowing out into the outside air. The fuel vapor adsorbed by the activated carbon in the canister 25 is sucked into the engine intake passage through a conduit (not shown) during a predetermined engine operating state.

In the present invention, only the on-off valve 8 is disposed within the fuel injection pipe 1, and the control valve 14 is disposed within a valve housing 10 attached to the outer wall of the fuel injection pipe 1. Since the control valve 14 is disposed in the valve housing 10 attached to the outer wall of the fuel injection pipe 1 in this way, there is an advantage that the control valve 14 can be easily attached, and the fuel vapor in the control valve 14 is It has the advantage of allowing a sufficiently large distribution area. Also, when the control valve 14 is opened, the control valve 1
The abutting surface 19 of the rod 4 abuts against the control rod tip 17a, and at this time the abutting surface 19 and the control rod 17 form a substantially right angle. Therefore, no bending moment is applied to the control rod 17, and only axial force is applied to the control rod 17, so that the control rod 17 will not be deformed, and the bearing portion of the control rod 17 will not wear unevenly.

[Effect of idea]

The control valve can be easily installed and the control valve fuel vapor flow area can be made sufficiently large.
Furthermore, by forming the opening/closing valve part that comes into contact with the control rod from an inclined surface when the opening/closing valve is opened, and making the control rod contact the inclined surface at a substantially right angle, deformation of the control rod can be prevented. Uneven wear of the bearing portion of the control rod can be prevented.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of the area around the fuel injection pipe, Figure 2 is a sectional view taken along the - line in Figure 1, and Figure 3 is a perspective view of the on-off valve in Figures 1 and 2, viewed from below. , FIG. 4 is a perspective view showing another embodiment of the on-off valve, and FIG. 5 is a schematic side sectional view of the fuel tank. DESCRIPTION OF SYMBOLS 1... Fuel injection pipe, 8... Opening/closing valve, 10... Valve housing, 14... Control valve, 15... Valve body, 1
7... Control rod, 19... Contact surface, 20... Recess, 22... Fuel vapor inflow pipe, 23... Fuel vapor outflow pipe.

Claims (1)

[Scope of utility model registration request] A flat, normally-closed on-off valve that opens when the fuel supply nozzle is inserted is rotatably arranged inside the fuel injection pipe, and a valve housing is attached to the outer wall of the fuel injection pipe, and the fuel vapor flows from the fuel tank to the fuel vapor purification device. A normally closed control valve for controlling the flow is disposed within the valve housing, and a control rod connected to the valve body of the control valve projects into the fuel injection pipe in a direction substantially perpendicular to the axis of the fuel injection pipe. The opening/closing valve portion that comes into contact with the control rod when the opening/closing valve is opened is formed from an inclined surface extending at an angle with respect to the flat opening/closing valve, and the control rod is brought into contact with the inclined surface at a substantially right angle to open/close the opening/closing valve. A fuel tank for a vehicle in which fuel vapor within the fuel tank is sent to a fuel vapor purification device by moving a control rod in the axial direction of the valve to open the control valve.