JPH0942508A - Fuel cut valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a holding plate to a fuel tank so as to make sure retention of a valve housing to the fuel tank by forming a bottom part of the valve housing of a fuel cut valve by the holding plate fixed to an upper surface of the fuel tank and by locking a side plate of the valve housing to the holding plate. SOLUTION: A fuel cut valve 1 is formed such that a bottom part 10 of a valve housing 4 is formed by a holding plate 3 and a body of the valve housing 4 is attached to the holding plate 3. Therefore, after the valve housing 4 is attached to the upper half part of a fuel tank 2, the valve housing 4 is positioned on the holding plate 3 and never falls into the fuel tank 2, even if the attachment of the bottom part 10 to the body of the valve housing 4 is loosen by welding at the time of forming the fuel tank 2 or by vibration during operation. Thus, retention of the valve housing to the fuel tank can be performed surely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cut valve which is attached to, for example, a fuel tank of an automobile to prevent fuel from flowing out to a vent line.

[0002]

2. Description of the Related Art Conventionally, a fuel cut valve as shown in FIG. 3 has been disclosed in, for example, Japanese Utility Model Laid-Open No. 2-12051.

The fuel cut valve 21 is suspended from the upper surface of the fuel tank 22 of an automobile through a mounting bracket 23, and is arranged above the liquid level of fuel.

The fuel cut valve 21 is provided with a valve housing 24, a valve opening 27 communicating with a rubber hose 26 to a fuel vapor vent line through a pipe 25 projecting laterally outside the valve housing 24. The valve 28 is integrated with a float 28 that opens and closes the valve port 27 by sensing the liquid level in the fuel tank 22.

The float 28 is coaxially arranged in a hollow cylindrical valve housing 24 and can move up and down, but since it is normally seated on the bottom portion 30 of the valve housing 24, the float 28 is The valve element 29 on the top and the valve opening 27 on the top of the valve housing 24 facing the valve element 29 are separated from each other. Therefore, the fuel vapor generated from the fuel is always guided to the vent line through the valve port 27 and then adsorbed by the adsorbent in the canister (not shown) arranged in the vent line while the engine is stopped. During operation, it is sucked into an intake manifold (not shown) and burned in an engine combustion chamber (not shown).

When the fuel level fluctuates due to factors such as acceleration, turning, and stopping of the vehicle, and the level of the fuel rises sharply, the fuel is supplied to a plurality of holes 31 provided in the bottom portion 30.
Also, the air enters into the valve housing 24 through a plurality of holes 32 provided in the side wall of the valve housing 24, and the float 28 is moved upward while discharging the fuel vapor in the upper portion from the valve port 27. Since the valve opening 27 is closed by the upward movement of the float 28, even if the fuel enters the valve housing 24 at the next moment, it does not flow out to the vent line.

In this way, the fuel cut valve 2
1 is capable of reducing the vertical space occupied by the upper surface of the inside of the fuel tank by mounting the fuel tank, increasing the capacity without increasing the height of the fuel tank, and venting the fuel when the fuel level rises sharply. It is possible to prevent outflow to the line.

[0008]

By the way, in the prior art, the bottom portion 30 of the valve housing 24 is
The fuel tank 22 is made of synthetic resin and is assembled to the main body of the valve housing 24.
After assembling the valve housing 24 to the upper half of the above, the assembly of the bottom portion 30 is softened by welding when forming the fuel tank 22, or heat when coating and drying the fuel tank after formation, or during operation. Due to the vibration, the assembly may be loosened, and the bottom portion 30 may drop from the main body of the valve housing 24 into the fuel tank 22.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to configure a bottom portion of a valve housing with a holding plate for holding the valve housing, and An object of the present invention is to provide a fuel cut valve in which a holding plate is fixed to a fuel tank to securely hold the valve housing from the fuel tank and reduce the number of parts.

Further, another object of the present invention is to provide a fuel cut valve in which the holding plate is made of a metal plate to more securely hold the valve housing.

Further, the valve housing is further held by the engagement of the side plate of the valve housing and the bottom of the valve housing composed of the holding plate and the holding of the valve housing by the branching auxiliary support member from the holding plate. The aim is to provide a reliable fuel cut valve.

Another object of the present invention is to provide a fuel cut valve in which the valve housing and the metal pipe of the vent line are directly connected so that the valve housing can be held more reliably and the number of parts can be further reduced.

Further, another object of the present invention is to provide a fuel cut valve in which the float can be accurately molded.

[0014]

To achieve the above object, in a fuel cut valve according to the present invention, a bottom portion of a valve housing is formed by a holding plate fixed to an upper surface of a fuel tank, and the holding plate is provided with the valve. It is characterized in that the side plate of the housing is locked.

The holding plate is made of a metal plate.

Further, a plurality of hooks extending downward from the side plate of the valve housing are formed, and a hook locking hole is formed in the bottom portion of the valve housing formed of the holding plate to lock the hook, and one side upper surface is provided. It is characterized in that a thick portion is provided and a locking hole is formed in the thick portion, and a branch auxiliary support member from the holding plate is inserted into the locking hole.

Further, the present invention is characterized in that the metal pipe of the vent line is directly connected to the tip of the pipe extending from the valve port and protruding laterally outside the valve housing.

Further, the present invention is characterized in that an annular groove is formed in the center of the upper surface of the float in the valve housing.

[0019]

1 and 2 relate to an embodiment of the present invention. FIG. 1 is a vertical sectional view of a fuel cut valve according to the present invention, and FIG. 2 is a bottom view thereof.

In FIG. 1, reference numeral 1 denotes a fuel cut valve, which is attached via a synthetic resin holding plate 3 fixedly attached to an upper surface of an inside of a fuel tank 2 of an automobile, and which is a fuel liquid. It is located above the surface level.

The fuel cut valve 1 includes a valve housing 4, a valve port 7 communicating with a metal pipe 6 of a fuel vapor vent line through a pipe 5 projecting laterally outside the valve housing 4, and a fuel tank 2. It is composed of a float 8 which moves up and down by sensing the liquid level inside, and a valve body 9 which is formed on the float 8 and opens and closes the valve port 7.

As shown in FIG. 1, one end of the holding plate 3 attached to and fixed to the upper surface of the inside of the fuel tank 2 is fixed to the upper surface of the inside of the fuel tank 2 by welding, riveting, etc. The bottom portion 10 of the valve housing 4 may be constituted by a horizontal portion extending downward in a letter shape to hold the valve housing 4, or the valve housing 4 may be formed in a substantially U shape and both upper ends thereof may be an upper surface portion in the fuel tank 2. It is advisable to use it for the purpose of holding the valve housing 4 such that it is fixed by welding or riveting and the lower horizontal portion constitutes the bottom portion of the valve housing 4. Further, the bottom portion 10 formed of the holding plate 3 and the side plate of the valve housing 4 may be assembled by forming a hook on one side and a locking hole or a locking groove on the other side.

In the fuel cut valve 1 having the above structure, the float 8 is coaxially arranged in the hollow cylindrical valve housing 4 and can move up and down.
Since it is normally seated on the holding plate 3 that constitutes the bottom portion 10 of the valve housing 4, the valve body 9 at the top of the float 8 and the valve opening 7 at the top of the valve housing 4 facing this are separated from each other. Therefore, the fuel vapor generated from the fuel is always led out to the metal pipe 6 of the vent line through the valve port 7, and then in the canister (not shown) arranged in the vent line while the engine is stopped. It is adsorbed by the adsorbent and is sucked into the intake manifold (not shown) during operation to be burned in the engine combustion chamber (not shown).

When the fuel level fluctuates due to causes such as acceleration, turning, and stopping of the vehicle, and the level of the fuel rises sharply, the fuel is supplied to the plurality of holes 1 provided in the bottom portion 10.
3 and 14 enter into the valve housing 4, and the float 8 is moved upward while discharging the fuel vapor in the upper portion from the valve port 7. Since the valve opening 7 is closed by the upward movement of the float 8, even if fuel enters the valve housing 4 at the next moment, it does not flow out to the vent line.

In the fuel cut valve 1 according to the present invention, the bottom 10 of the valve housing 4 is formed by the holding plate 3, and the main body of the valve housing 4 is the holding plate 3.
The valve housing 4 is attached to the upper half of the fuel tank 2 by welding when forming the fuel tank 2 or heat when painting / drying the fuel tank after the formation. Even if the assembly of the bottom portion 10 and the main body of the valve housing 4 becomes loose, or the assembly of the bottom portion 10 and the main body of the valve housing 4 becomes loose due to vibration during operation, the valve housing 4 remains on the holding plate 3. Therefore, it is securely held without falling into the fuel tank 2. Further, since the holding plate 3 also serves as the bottom portion of the valve housing 4, the number of parts can be reduced accordingly.

When the holding plate 3 is made of a metal plate, there is little possibility that the bottom portion 10 and the main body of the valve housing 4 will be disassembled due to heat or the like as described above. The holding of the housing 4 can be performed more reliably.

Further, as described above, the holding plate 3 attached to the upper surface of the inside of the fuel tank 2 extends downward in a substantially L shape, and its bottom side constitutes the bottom portion 10 of the valve housing 4, and the valve housing 4 Is cantilevered by the holding plate 3, and the three hooks 11 extending from the side plate of the valve housing 4 are respectively locked in the locking holes 12 formed in the bottom portion 10 of the holding plate 3, and A thick portion 17 is provided on one upper side surface of the valve housing 4, and a locking hole 18 is formed in the thick portion 17, and a branch auxiliary support member 19 from the holding plate 3 is inserted into the locking hole 18. When the valve housing 4 is attached, not only the branch auxiliary support member 19 positions and stops the valve housing 4, but also the valve housing 4 has a lower part via the hook 11 and an upper part with the branch auxiliary support part. 19 through, it means that is held by the holding plate 3 which is cantilevered to the fuel tank 2, the holding of the valve housing 4 becomes more reliable. In addition,
13 and 14 are fuel passages formed in the bottom portion 10,
Reference numeral 15 is a spring, and 16 is a reinforcing rib.

Further, when the metal pipe 6 of the vent line is directly connected to the end of the pipe 5 extending from the valve port 7 and protruding laterally outside the valve housing 4, conventionally, a rubber hose is interposed between the two. Not only is there no concern about rubber deterioration, but also the swinging of both is synchronized and no unreasonable force is applied to the valve housing 4, and there is no need for a stop clip at the connecting part, so that the valve housing 4 is retained. The number of parts can be further reduced.

Further, the flow inside the valve housing 4 is
When the annular groove 20 is formed in the central portion of the upper surface of the float 8, sink marks, which are likely to occur during casting of the float 8, can be sufficiently prevented.

[0030]

According to the present invention, since the bottom portion of the valve housing is formed by the holding plate and is assembled to the main body of the valve housing, it is assumed that the bottom of the valve housing is attached to the main body of the valve housing due to welding heat when forming the fuel tank. Even if the assembly of the bottom part and the main body of the valve housing becomes loose, or the assembly of the bottom part and the main body of the valve housing becomes loose due to vibration during operation, the valve housing falls on the holding plate and falls into the fuel tank. It is securely held without doing. Further, since the holding plate also serves as the bottom portion of the valve housing, the fuel cut valve has the number of parts reduced accordingly.

When the holding plate is made of a metal plate, there is little possibility that the bottom part and the main body of the valve housing will be disassembled due to heat or the like as described above, so that the holding plate holds the valve housing. The fuel cut valve can be more reliably performed.

Further, a plurality of hooks extending downward from the side plate of the valve housing are formed, and a hook locking hole is formed in the bottom portion of the valve housing composed of the holding plate to lock the hooks, and the hook is locked on the upper side surface of the valve housing. When a thick portion is provided on the side and a locking hole is formed in the thick portion and a branch auxiliary support member from the holding plate is inserted into the locking hole, the branch auxiliary support member is attached to the valve housing. In addition to positioning and detent, the valve housing is held by the holding plate fixed to the fuel tank, with the lower part of the valve housing via hooks and the upper part of the valve auxiliary support member. The holding of the housing becomes a more reliable fuel cut valve.

When the metal pipe of the vent line is directly connected to the tip of the pipe extending from the valve port and protruding to the outside of the side of the valve housing, a rubber hose is conventionally interposed between the two. In addition to the possibility of rubber deterioration, the swinging of both will be synchronized and unnecessary force will not be applied to the valve housing, and the retaining clip at the connecting part will not be required, so the valve housing can be held more securely and the number of parts can be increased. The fuel cut valve is designed to be further reduced.

Further, when an annular groove is formed in the center of the upper surface of the float in the valve housing, sink marks, which are likely to occur during casting and molding of the float, can be sufficiently prevented. The fuel cut valve can be opened and closed accurately.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fuel cut valve according to an embodiment of the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a vertical cross-sectional view of a conventional fuel cut valve.

[Explanation of symbols]

 1 Fuel Cut Valve 2 Fuel Tank 3 Retaining Plate 4 Valve Housing 5 Pipe 6 Metal Pipe 7 Valve Port 9 Valve Body 10 Bottom of Valve Housing 11 Hook 12 Locking Hole 17 Thickened Part 18 Locking Hole 19 Branch Auxiliary Support Member 20 Annular Groove

Claims (5)

[Claims] 1. A valve housing disposed in an upper part of a fuel tank, a valve port provided in the valve housing and communicating with a vent line through a pipe projecting to the outside of the valve housing, and a valve housing disposed in the valve housing. A fuel cut valve including a float that moves up and down by sensing a liquid level in a fuel tank, and a valve body that is formed above the float and that opens and closes a valve opening. A fuel cut valve characterized in that a bottom portion is formed by a holding plate fixed to an upper surface of a fuel tank, and a side plate of the valve housing is locked to the holding plate. 2. The fuel cut valve according to claim 1, wherein the holding plate is made of a metal plate. 3. A plurality of hooks extending downward from a side plate of the valve housing are formed, and a hook locking hole is provided in a bottom portion of the valve housing composed of the holding plate to lock the hook, and one side upper surface is provided. 3. The thickened portion is provided to form a locking hole in the thickened portion, and the branching auxiliary support member from the holding plate is inserted and fitted into the locking hole. Fuel cut valve. 4. A metal pipe of a vent line is directly connected to a tip of a pipe extending from the valve port and projecting laterally outside the valve housing.
Alternatively, the fuel cut valve according to claim 3. 5. The fuel cut valve according to claim 1, wherein an annular groove is formed in the center of the upper surface of the float in the valve housing. .