JPH10318064A - Cut-off valve and fuel tank device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cut-off valve and a fuel tank device which can reduce number of connection processes of connection pipes and reduce possibility of leakage of fuel vapor from the connection parts of the connection pipes. SOLUTION: A plurality of cut-off valves 1 each having a joint 19 provided with a flow passage communicated with an outlet are attached to a ceiling of a fuel tank 31. The joints 19 of the cut-off valves 1 are connected to a canistor. In such a case, connectors 21 each having a flow passage communicated with the flow passage of the joint 19 are arranged on the cut-off valves 1A to 1C, except one. The joints 19 of the cut-off valves 1 and 1A to 1C, the connectors 21 are sequentially connected to each other by means of connection pipes 51, and connected to the canistor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cut-off valve which is mounted on a ceiling of a fuel tank of a vehicle and which releases fuel vapor in the fuel tank to a canister outside the fuel tank to prevent a rise in pressure in the fuel tank. The present invention relates to a fuel tank device for connecting a plurality of cut-off valves attached to a fuel tank to a canister via a connection pipe.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view of a conventional cut-off valve, and FIG. 8 is a perspective view of a fuel tank device in which the cut-off valve shown in FIG. The illustration of the filler neck and the like in FIG. 8 is omitted.

In FIG. 7 or FIG. 8, reference numeral 1 denotes a cut-off valve, and a cut-off valve main body 2, a mounting flange portion 18 provided on an upper peripheral edge of the cut-off valve main body 2, and a cut-off valve main body 2. Provided at the top,
The joint portion 19 includes a joint portion 19 having a flow passage communicating with the outlet 9 of the valve seat ring 8, and a reinforcing rib 20 supporting the joint portion 19. The above-described cutoff valve main body 2 includes a cylindrical housing 3, a valve body 13 housed in the housing 3, which functions as a float, and a coil spring 17 which assists the floating of the valve body 13. .

The above-mentioned housing 3 has a ceiling, a cylindrical housing body 4 having an open bottom, a valve seat ring 8 made of synthetic resin welded to the ceiling of the housing body 4, and a housing body. 4 and a cap 10 formed of a cylindrical synthetic resin with a closed bottom and an open ceiling. The above-mentioned housing body 4 has a valve seat ring 8 at the center of the ceiling from the inside.
Is provided with a valve seat ring mounting hole 5 having a step portion to be welded, a plurality of circular openings 6 forming a part of the inflow port are provided in an upper portion of the side wall, and a predetermined interval is provided at a lower end portion of the outer peripheral surface. For example, cap locking claws 7 positioned at 90 degree intervals are provided.

The above-mentioned valve seat ring 8 is formed of a synthetic resin, and is provided at the center with a circular outlet 9 communicating with the valve seat ring mounting hole 5. In the cap 10 described above,
In the upper part of the side wall, a plurality of engaging holes 11 are provided corresponding to the plurality of cap locking claws 7 so that the cap locking claws 7 protrude and engage with the cap 10. A plurality of circular openings 12 are provided.

The above-mentioned valve body 13 moves in the axial direction within the housing 3 to open and close the outlet 9 of the valve seat ring 8. A valve head 14 for opening and closing the outlet 9 is provided on the upper surface.
Circular recess 15 for receiving coil spring 17 on the lower side
Are provided in the axial direction, and a through hole 16 communicating with the concave portion 15 and opening to the upper surface is provided. Numeral 31 denotes a fuel tank made of synthetic resin, which has a substantially square planar shape, and the cut-off valve 1 is attached to the ceiling at the four corners with the attachment flange 18. 41 is a connector provided with five joints, and 51 is a connecting pipe.

[0007] The coil spring 17 is connected to the valve body 13.
Cannot be closed by moving the valve body 13 against its own weight, and the urging force can be set to close the outlet 9 by moving the valve body 13 in cooperation with the buoyancy. Have been. Then, the housing body 4, the mounting flange portion 18,
The joint 19 and the reinforcing rib 20 are integrally formed of a synthetic resin, and the flow passage of the joint 19 communicates with the outlet 9.

Next, the attachment of the cutoff valve to the fuel tank and the piping will be described. First, the attachment of the cutoff valve 1 to the fuel tank 31 will be described. The cutoff valve 1 is inserted from the cap 10 into the circular openings (not shown) provided at the four corners of the ceiling of the fuel tank 31 and attached. The flange 18 is brought into contact with the ceiling of the fuel tank 31. Then, the cutoff valve 1 is hermetically attached to the four corners of the ceiling of the fuel tank 31 by thermally welding the mounting flange portion 18 to the ceiling of the fuel tank 31.

Next, the piping will be described. After connecting each cut-off valve 1 and each joint of the connector 41 with a connecting pipe 51, the remaining joint of the connector 41 and the joint of a canister (not shown) are connected. Are connected by the connection pipe 51, thereby completing the piping as shown in FIG.

Next, the operation will be described. First, in a normal state in which the cutoff valve 1 is attached to the fuel tank 31, the valve body 13 resists the urging force of the coil spring 17.
Is lowered by its own weight, and the valve head 14 opens the outlet 9.
Therefore, the fuel vapor generated in the fuel tank 31, for example, the vapor of gasoline flows into the outlet 9 from the openings 6, 12 or from the opening 12, the recess 15 and the through hole 16, and from the outlet 9 to the joint 19, It is discharged to the canister via the connection pipe 51, the connector 41, and the connection pipe 51, and prevents the pressure in the fuel tank 31 from increasing.

[0011] When the vehicle is suddenly accelerated or braked or the steering wheel is turned sharply, a large inertia force is generated, and the gasoline is opened by the inertia force.
When the valve body 13 flows into the housing 3, the valve body 13 tends to float (raise) due to buoyancy. However, since the specific gravity of the valve body 13 is larger than gasoline, the valve body 13 cannot float itself and the coil spring 17 Floating with the aid of the urging force, the outlet 9 is closed by the valve head 14, and gasoline flows out of the outlet 9.
From the fuel tank 31 to the outside.

When the vehicle returns to a normal state and gasoline in the housing 3 returns to the fuel tank 31 through the opening 6 or 12, the valve 13 compresses the coil spring 17 by its own weight and descends. Exit 9 is opened. Further, cut-off valves 1 are provided at the four corners of the ceiling of the fuel tank 31.
Is attached, no matter how the vehicle is inclined, at least one of the cutoff valves 1 attached to the fuel tank 31 is not immersed in gasoline. Pressure rise can be prevented.

[0013]

Since the conventional cutoff valve 1 is provided with only one joint portion 19, if n cutoff valves 1 are attached to the fuel tank 31, n cutoff valves 1 are provided. Valve 1 and connector 41
Must be connected by a connection pipe 51, and the connector 41 and the canister must be connected by a connection pipe 51. Therefore, FIG.
As shown in the figure, when four cutoff valves 1 are attached to the fuel tank 31, 9 (= 2 × n + 1 = 2 × 4 + 1)
The connecting pipe 51 must be connected at a location.
The number of connection points increases, and the number of connection steps increases. And
As the number of connection points for connecting the connection pipes 51 increases, the possibility that fuel vapor leaks from the connection points of the connection pipes 51 increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned inconveniences, and can reduce the number of connection man-hours for connecting pipes and reduce the possibility of fuel vapor leaking from the connecting portions of the connecting pipes. A cut-off valve and a fuel tank device are provided.

[0015]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cut-off valve having a joint having a flow passage communicating with an outlet, wherein one or more connector portions having a flow passage communicating with the flow passage are provided. Things.

According to another aspect of the present invention, a plurality of cutoff valves having a joint having a flow passage communicating with an outlet are mounted on a ceiling of a fuel tank, and the joints of the plurality of cutoff valves are connected to a canister. In the fuel tank device, a cut-off valve except one is provided with a connector portion having a flow passage communicating with the flow passage, and a joint portion of the plurality of cut-off valves and a connector portion are sequentially connected in series by a connecting pipe. Connected to a canister or one of a plurality of cut-off valves is provided with a number of connector parts each having a flow passage communicating with the flow path, minus one from one of the plurality of cut-off valves. Connect the joints of the off-valves in parallel with connecting pipes,
The joint part of the cutoff valve provided with the connector part is connected to the canister by a connection pipe.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a cut-off valve according to a first embodiment of the present invention, and FIG. 2 is a plan view of a fuel tank device in which the cut-off valve shown in FIG. 1 and FIG. It is a corresponding explanatory view, and the same or corresponding parts as those in FIGS. 7 and 8 are denoted by the same reference numerals and description thereof is omitted. Note that the connector section in FIG. 1 is illustrated in a 180-degree positional relationship with the joint section. The illustration of the filler neck and the like in FIG. 2 is omitted.

In FIG. 1 or FIG. 2, 1A, 1B, 1
C denotes a cut-off valve, and the cut-off valve 1 shown in FIGS. 7 and 8 is provided with a connector 21 having a flow passage communicating with the flow passage of the joint 19. The connector portion 21 includes the housing body 4, the mounting flange portion 18, the joint portion 19, and the reinforcing rib 20.
And a synthetic resin.

Next, the attachment of the cutoff valve to the fuel tank and the piping will be described. First, the attachment of the cut-off valves 1, 1A to 1C to the fuel tank 31 will be described. The cut-off valves 1, 1A to 1C are inserted into circular openings (not shown) provided at the four corners of the ceiling of the fuel tank 31.
1C is inserted from the cap 10 side and the mounting flange portion 18 is inserted.
Is brought into contact with the ceiling of the fuel tank 31. Then, the cutoff valves 1, 1 </ b> A to 1 </ b> C are hermetically attached to the four corners of the ceiling of the fuel tank 31 by thermally welding the mounting flange portion 18 to the ceiling of the fuel tank 31.

Next, the piping will be described. The joint 19 of the cutoff valve 1 and the cutoff valve 1A
Of the cutoff valve 1A and the cutoff valve 1B.
Of the cut-off valve 1B and the joint portion 19 of the cut-off valve 1C.
2 is connected to the joint portion 19 of the cut-off valve 1C and the joint portion of the canister (not shown) by the connection tube 51, thereby connecting the piping 21 as shown in FIG. Is completed. Since the operation is the same as that of the conventional example, the description is omitted.

As described above, according to the first embodiment of the present invention, since the connector portion 21 having the flow passage communicating with the flow passage of the joint portion 19 is provided, the cut-off valves 1A to 1C are provided with the connector. Functions can be added. Therefore, the cutoff valves 1, 1A to 1C can be connected in series without using a connector.

The cutoff valves 1, 1A to 1C are
As shown in FIG. 2, when four cutoff valves 1, 1A to 1C are attached to the fuel tank 31, 7 [= 2 × (n
−1) + 1 = 2 × 3 + 1], the connection pipe 51 may be connected, and the number of connection points of the connection pipe 51 is reduced, and the number of connection steps can be reduced. When the number of connection points of the connection pipe 51 is reduced as described above, the possibility that fuel vapor leaks from the connection point of the connection pipe 51 can be reduced.

FIG. 3 is a perspective view showing a main part of a cutoff valve according to a second embodiment of the present invention, and FIG. 4 is a view showing the cutoff valve shown in FIGS. 1, 3 and 7 attached to the ceiling of a fuel tank. FIG. 9 is an explanatory view corresponding to a plan view of a fuel tank device piped in a vertical direction, and the same or corresponding parts as in FIGS. FIG.
Are not shown in the figure.

In FIG. 3 or FIG. 4, reference numeral 1D denotes a cut-off valve. The cut-off valve 1 shown in FIGS. 7 and 8 is provided with two connector portions 21 each having a flow passage communicating with the flow passage of the joint portion 19. Are provided. In addition,
The two connector portions 21 are integrally formed with the housing main body 4, the mounting flange portion 18, the joint portion 19, and the reinforcing ribs 20 with a synthetic resin.

Next, the attachment of the cutoff valve to the fuel tank and the piping will be described. First, the attachment of the cutoff valves 1, 1A, 1D to the fuel tank 31 will be described. The cutoff valves 1, 1A, 1A, 1A, and 1D are inserted into circular openings (not shown) provided at the four corners of the ceiling of the fuel tank 31.
1D is inserted from the cap 10 side, and the mounting flange portion 18 is inserted.
Is brought into contact with the ceiling of the fuel tank 31. Then, the cutoff valves 1, 1 </ b> A, 1 </ b> D are hermetically attached to the four corners of the ceiling of the fuel tank 31 by thermally welding the mounting flange 18 to the ceiling of the fuel tank 31.

Next, the piping will be described. The joint 19 of one cut-off valve 1 and the connector 21 of the cut-off valve 1A are connected by a connecting pipe 51, and the joint 19 of the cut-off valve 1A is cut off. One connector part 21 of the valve 1D is connected by a connection pipe 51,
A connection pipe 51 connects the joint 19 of the other cutoff valve 1 and the other connector 21 of the cutoff valve 1D.
After connecting, the joint 1 of the cut-off valve 1D
By connecting the connection pipe 9 to a joint part of a canister (not shown) by a connection pipe 51, the piping is completed as shown in FIG. Since the operation is the same as the conventional example,
Description is omitted.

According to the second embodiment, the cutoff valves 1, 1A, 1D can be connected to a series system and a parallel system without using a connector, and the same effects as in the first embodiment can be obtained. Can be obtained.

FIG. 5 is a perspective view showing a main part of a cut-off valve according to a third embodiment of the present invention, and FIG. 6 is a diagram showing the cut-off valve shown in FIGS. This corresponds to a plan view of the fuel tank device, and the same or corresponding portions as in FIGS. 7 and 8 are denoted by the same reference numerals and description thereof is omitted. The illustration of the filler neck and the like in FIG. 6 is omitted.

In FIG. 5 or FIG. 6, reference numeral 1E denotes a cut-off valve. The cut-off valve 1 shown in FIGS. 7 and 8 is provided with a connector 21 having a flow passage communicating with the flow passage of the joint portion 19. Are provided. In addition,
The three connector portions 21 are formed integrally with the housing main body 4, the mounting flange portion 18, the joint portion 19, and the reinforcing ribs 20 using a synthetic resin.

Next, the attachment of the cutoff valve to the fuel tank and the piping will be described. First, the attachment of the cutoff valves 1 and 1E to the fuel tank 31 will be described. The cutoff valves 1 and 1E are inserted into the circular openings (not shown) provided at the four corners of the ceiling of the fuel tank 31 from the cap 10 side. The mounting flange portion 18 is inserted into contact with the ceiling of the fuel tank 31. And the mounting flange 1
The cutoff valves 1 and 1E are hermetically attached to the four corners of the ceiling of the fuel tank 31 by heat-welding 8 to the ceiling of the fuel tank 31.

Next, the piping will be described. The joint 19 of each cutoff valve 1 and the cutoff valve 1
After connecting each of the connector portions 21 of the cut-off valve 1E with the joint portion 19 of the cut-off valve 1E and the joint portion of the canister (not shown) with the connection tube 51, as shown in FIG. , Plumbing is complete. Since the operation is the same as that of the conventional example, the description is omitted.

According to the third embodiment, the cutoff valves 1 and 1E can be connected in parallel without using a connector, and the same effects as those of the first and second embodiments can be obtained.

In each of the above embodiments, the fuel tank 31
In the above description, four cut-off valves 1, 1A to 1E are mounted on the ceiling of the vehicle, but similar effects can be obtained when two or more cut-off valves are mounted.

[0034]

As described above, according to the present invention, one or more connector portions having a flow passage communicating with the flow passage of the joint portion are provided, so that the function of the connector is added to the cutoff valve. can do. Therefore, the cutoff valves can be connected in series and / or in parallel without using a connector.

When a plurality of the cut-off valves are mounted on the ceiling of the fuel tank and connected by connecting pipes, the number of connection points of the connecting pipes is reduced, and the number of connecting steps can be reduced.
And when the number of connection points of the connection pipe decreases,
It is possible to reduce the possibility that fuel vapor leaks from the connection point of the connection pipe.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cutoff valve according to a first embodiment of the present invention.

FIG. 2 is an explanatory view corresponding to a plan view of a fuel tank device in which the cutoff valve shown in FIGS. 1 and 7 is attached to a ceiling of a fuel tank and piped.

FIG. 3 is a perspective view showing a main part of a cutoff valve according to a second embodiment of the present invention.

FIG. 4 is an explanatory view corresponding to a plan view of a fuel tank device in which the cut-off valve shown in FIGS. 1, 3 and 7 is attached to a ceiling of a fuel tank and piped.

FIG. 5 is a perspective view showing a main part of a cutoff valve according to a third embodiment of the present invention.

FIG. 6 is an explanatory view corresponding to a plan view of a fuel tank device in which the cutoff valve shown in FIGS. 3 and 7 is attached to a ceiling of a fuel tank and piped.

FIG. 7 is a sectional view of a conventional cutoff valve.

8 is a perspective view of a fuel tank device in which the cutoff valve shown in FIG. 7 is mounted on a ceiling of a fuel tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cut-off valve 1A-1C Cut-off valve 1D Cut-off valve 1E Cut-off valve 2 Cut-off valve main body 3 Housing 6 Opening 8 Valve seat ring 9 Outflow port 13 Valve 17 Coil spring 18 Mounting flange 19 Joint 21 Connector 31 Fuel tank 51 Connecting pipe

Claims (4)

[Claims] 1. A cut-off valve having a joint having a flow passage communicating with an outlet, wherein a connector having a flow passage communicating with the flow passage is provided. 2. The cutoff valve according to claim 1, wherein a plurality of the connector portions are provided. 3. A fuel tank device comprising: a plurality of cutoff valves each having a joint having a flow passage communicating with an outlet; and mounting the cutoff valves on a ceiling of a fuel tank, and connecting the joints of the plurality of cutoff valves to a canister. In the above, the other cut-off valve except one is provided with a connector portion having a flow passage communicating with the flow passage, and the joint portion and the connector portion of the plurality of cut-off valves are sequentially connected in series by a connection pipe. And a fuel tank device connected to the canister. 4. A fuel tank device, wherein a plurality of cutoff valves having a joint having a flow passage communicating with an outlet are mounted on a ceiling of a fuel tank, and the joints of the plurality of cutoff valves are connected to a canister. In one of the plurality of cutoff valves, a connector having a flow passage communicating with the flow passage is provided in a number equal to the number obtained by subtracting 1 from one of the plurality of cutoff valves. The fuel tank device is characterized in that the parts are connected in parallel by a connecting pipe, and a joint of a cutoff valve provided with the connector part is connected to the canister by a connecting pipe.