JP2015020547A - Fuel shut-off device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel shut-off device which connects multiple fuel shut-off valves with the exterior and prevents a fuel in a fuel tank from flowing out to a canister.SOLUTION: A fuel shut-off device 20 includes: a casing 40 having a first valve chamber 41S, a second valve chamber, and an external connection passage 53p; a first float mechanism; and a second float mechanism 150. The casing 40 includes: a trap chamber 44S disposed below the external connection passage 53p; a first connection passage 54p which connects the first valve chamber 41S and the trap chamber 44S with the external connection passage 53p; and a second connection passage 55p which connects the second valve chamber with the trap chamber 44S.

Description

  The present invention relates to a fuel cutoff device mounted on a fuel tank.

  Conventionally, a configuration in which a plurality of fuel cutoff valves are mounted as a fuel cutoff device is known (Patent Document 1). The fuel shut-off valve is a mechanism that shuts off the passage that communicates with the outside of the fuel tank when the fuel level of the fuel tank reaches a predetermined level, and the fuel level in the fuel tank is below a predetermined level. In this case, the ventilation between the fuel tank and the canister is ensured, and when the predetermined liquid level is exceeded, the outflow of fuel to the canister is prevented.

  The fuel shut-off device uses a plurality of fuel shut-off valves that shut off the passage at different fuel liquid levels, so that the fuel shut-off device can be supplied to the canister side in response to different fuel liquid levels accompanying refueling, vehicle swinging and turning. Prevents fuel spills. In addition, the fuel shut-off device simplifies the passage structure by reducing the number of passages to the canister side by connecting a plurality of fuel shut-off valves arranged in the fuel tank with a single passage or piping. .

JP 2002-4966 A

  However, in the conventional fuel cutoff device, when one fuel cutoff valve is closed beyond the first liquid level, when another fuel cutoff valve has not yet reached the valve closing liquid level, There has been a problem that the fuel flowing out from the fuel shut-off valve passes through the passage in the one fuel shut-off valve and flows out to the canister side.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

(1) According to one aspect of the present invention, there is provided a fuel cutoff device that is attached to a fuel tank and that cuts off a passage to the outside of the fuel tank. The fuel shut-off device is connected to the outside of the fuel tank, a first valve chamber communicating with the fuel tank, a second valve chamber communicating with the fuel tank and spaced apart from the first valve chamber, and the fuel tank. And a casing having an external connection passage connected to the first valve chamber and the second valve chamber, and the fuel level in the fuel tank stored in the first valve chamber has reached the first fuel level. The first float mechanism that closes up the passage between the first valve chamber and the external connection passage by rising, and the fuel level in the fuel tank that is housed in the second valve chamber is the first fuel. And a second float mechanism that closes the passage between the second valve chamber and the external connection passage by rising when reaching a second fuel liquid level higher than the liquid level, and the casing includes the external A trap chamber disposed below the connecting passage, and the first chamber Having a first connection path connecting the chamber and the trap chamber and the said outer connecting passage, and a second connecting passage for connecting the second valve chamber and the trap chamber, characterized by.
The fuel leaking from the second valve chamber flows through the second connection passage into the trap chamber provided in the casing. Since the trap chamber is provided below the external connection passage, the fuel in the trap chamber is unlikely to return to the external connection passage. Therefore, the outflow of fuel from the external connection passage can be prevented.

(2) As another aspect, the second connection passage is a fuel cutoff device that branches from the external connection passage and connects the second valve chamber and the trap chamber.

(3) As another aspect, a flow path guide member that is disposed in the external connection passage and guides the fuel that has flowed out of the second valve chamber to the second connection path is provided. The fuel cutoff device includes a plurality of guide plates arranged along a passage of the external connection passage and a plurality of guide passages formed between the guide plates. The flow path guide member can suppress the disturbance of the flow of the fuel that has entered the guide plate and can reliably lead to the second connection passage.

(4) As another aspect, the casing includes a first connection pipe that forms the first connection passage, and the first connection pipe projects downward in the trap chamber. Device. With this configuration, fuel accumulates in the space between the trap chamber and the first connection pipe, and the fuel accumulated in the trap chamber hardly flows out to the outside through the first connection passage.

(5) As another aspect, the casing has a connection opening that is provided in a passage between the first valve chamber and the first connection passage and is opened and closed by the first float mechanism,
The fuel cutoff device is set such that D2 <D1, where D1 is the diameter of the connection opening and D2 is the diameter of the opening of the first connection pipe. With this configuration, since the diameter of the opening of the first connection pipe is set smaller than the diameter of the connection opening, the fuel that has flowed out of the connection opening is unlikely to enter the first connection passage and to the outside through the external connection passage. .

(6) As another aspect, the second connection passage is a fuel cutoff device provided in a second connection pipe that directly connects the second valve chamber and the trap chamber.

It is sectional drawing which shows the fuel tank of the motor vehicle carrying the in-tank valve unit which has a fuel cutoff device concerning 1st Example of this invention. It is a perspective view which shows a fuel cutoff device. It is sectional drawing which shows the fuel cutoff device accommodated in the support part. It is sectional drawing which decomposes | disassembles and shows the casing of a support part and a 1st fuel cutoff valve. It is sectional drawing which shows the upper part of a fuel cutoff device. It is explanatory drawing explaining each channel | path of a cover body. It is sectional drawing which decomposes | disassembles and shows a 1st float mechanism. It is sectional drawing which shows a 2nd fuel cutoff valve. It is explanatory drawing explaining operation | movement of a fuel cutoff device. It is explanatory drawing explaining the operation | movement following FIG. It is a perspective view which decomposes | disassembles and shows the casing of a 1st fuel cutoff valve. It is explanatory drawing explaining the assembly | attachment structure of a casing and a support part. It is sectional drawing which shows the fuel cutoff apparatus concerning 2nd Example. It is sectional drawing which shows the fuel cutoff device concerning the modification of 2nd Example.

A. First Embodiment (1) Schematic Configuration of In-Tank Valve Unit Mounting Structure FIG. 1 is a cross-sectional view showing a fuel tank FT of an automobile equipped with an in-tank valve unit according to a first embodiment of the present invention. The fuel tank FT is formed by laminating a plurality of resin materials, and is manufactured by a well-known method, that is, by extruding a cylindrical parison into a mold. In the fuel tank FT, a support 10 and a fuel cutoff device 20 are arranged. The support body 10 is a member that supports the fuel cutoff device 20 and enhances the support structure of the fuel tank or reduces the wave of the fuel. The fuel cutoff device 20 is a so-called in-tank type, and is configured by combining a first fuel cutoff valve 30 and a second fuel cutoff valve 100. The first fuel shut-off valve 30 is a valve that performs an auto-stop function that regulates outflow to the canister (external) when the fuel level in the fuel tank FT rises to a predetermined first fuel level FL1 during refueling. is there. The second fuel shut-off valve 100 prevents the fuel from flowing into the canister when the fuel level in the fuel tank FT rises to a predetermined second fuel level FL2 when the vehicle is tilted or when the vehicle is turning sharply. It is a valve to regulate. Hereinafter, the configuration of each unit will be described.

(2) Configuration of the Support 10 The support 10 includes a damper portion 11 welded to the lower wall of the fuel tank FT, a support column 12 formed on the upper portion of the damper portion 11, and a fuel cutoff formed on the support column 12. And a support portion 13 that houses the device 20. The damper portion 11 absorbs expansion and contraction of the fuel tank and mitigates transmission of vibration of the fuel tank to the fuel cutoff device 20.

  FIG. 2 is a perspective view showing the fuel cutoff device 20. The support portion 13 is a member that supports the fuel cutoff device 20 and covers the periphery of the fuel cutoff device 20 to prevent a fuel wave from reaching the fuel cutoff device 20, and includes a mounting plate 14 and a mounting plate. 14 is provided with a side wall 15 projecting upward from the outer peripheral portion of 14 and surrounding the fuel cutoff device 20, and is opened upward by an opening. Three storage side support portions 16 projecting upward from the upper end of the side wall 15 are formed on the upper portion of the support portion 13 at equal intervals in the circumferential direction. The storage side support part 16 fixes the fuel cutoff device 20, and is provided with a support body 16a formed of a cantilever from the upper end of the side wall 15, and a claw 16b at the tip of the support body 16a. The configuration in which the storage side support portion 16 supports the fuel cutoff device 20 will be described later.

(3) Configuration of Fuel Shutdown Device 20 FIG. 3 is a cross-sectional view showing the fuel cutoff device 20 housed in the support portion 13. The first fuel cutoff valve 30 includes a casing 40 and a first float mechanism 70 as main components. The casing 40 and the like are made of a resin material having excellent fuel swell resistance, for example, a resin such as polyethylene, polyamide, or polyacetal.

FIG. 4 is an exploded sectional view showing the support portion 13 and the casing 40 of the first fuel cutoff valve 30. The casing 40 includes a casing main body 41, a bottom member 45, and a lid body 50.
The casing main body 41 includes a cylindrical main body side wall 42, an upper wall 43 formed integrally with the upper portion of the main body side wall 42, and an extended side wall 44 extending upward from the upper end of the upper wall 43.
An engagement hole 42 a for attaching the bottom member 45 is formed in the lower portion of the main body side wall 42. A main body side engaging portion 42 b for attaching the lid 50 is formed on the upper portion of the main body side wall 42. A connection opening 43a is formed at the center of the upper wall 43, and a seal part 43b is formed along the peripheral edge of the opening.
The bottom member 45 is a member that is attached to the lower end of the main body side wall 42 and supports the first float mechanism 70 (FIG. 3), and includes a disc-shaped bottom main body 46. A first communication hole 46 a is formed in the bottom main body 46. A claw 46 b that engages with the engagement hole 42 a of the casing body 41 is formed on the outer peripheral portion of the bottom body 46. The bottom member 45 is attached to the casing body 41 by the claw 46b engaging with the engagement hole 42a. A space surrounded by the casing body 41 and the bottom member 45 is a first valve chamber 41S, and the first float mechanism 70 (FIG. 3) is stored in the first valve chamber 41S.

FIG. 5 is a cross-sectional view showing the upper part of the fuel cutoff device 20. The lid 50 includes a disc-shaped lid upper wall 51, a lid side wall 52 projecting in a cylindrical shape downward from the outer periphery of the lid upper wall 51, an external connection pipe 53, a first connection pipe 54, 2 connecting pipes 55.
The lid 50 forms a downward cup shape by the lid upper wall 51 and the lid side wall 52. The lid 50 is fitted to the extended side wall 44 on the upper portion of the casing body 41, thereby forming a trap chamber 44 </ b> S together with the upper wall 43 and the extended side wall 44 of the casing body 41. The trap chamber 44S is connected to the first valve chamber 41S through the connection opening 43a.
The external connection pipe 53 is disposed horizontally above the lid upper wall 51 and includes an external connection passage 53p therein. When the external connection passage 53p is divided into the first passage 53p-1 and the second passage 53p-2 in the horizontal direction around the connection opening 43a, one end of the first passage 53p-1 is connected to the canister side, The other end of the passage 53p-2 is connected to the second fuel cutoff valve 100.

The first connection pipe 54 has a pipe shape, and is disposed between the central portion of the lid upper wall 51 and the external connection pipe 53 in the vertical direction, and penetrates the lid upper wall 51 and projects into the trap chamber 44S. Are arranged to be. The central axis of the first connection pipe 54 is disposed at the center of the connection opening 43a.
A first connection passage 54 p having a circular cross section is formed in the first connection pipe 54. The first connection passage 54p connects the external connection passage 53p and the trap chamber 44S, is connected to the external connection passage 53p through the opening 54a, and is connected to the trap chamber 44S through the opening 54b. Here, when the diameter of the connection opening 43a is D1, and the diameter of the opening 54b of the first connection pipe 54 is D2, D2 <D1 is set.

The second connection pipe 55 is a member having a rectangular cross section disposed between the outer peripheral portion of the lid upper wall 51 and the external connection pipe 53, and penetrates the lid upper wall 51 into the trap chamber 44S. It is arranged to protrude. The center of the second connection pipe 55 is arranged at a position eccentric with respect to the connection opening 43a.
A second connection passage 55p (see FIG. 6) having a rectangular cross section is formed in the second connection pipe 55. The second connection passage 55p connects the trap chamber 44S and the external connection passage 53p, is connected to the external connection passage 53p through the opening 55a, and is connected to the trap chamber 44S through the opening 55b. The location where the second connection passage 55p is connected to the external connection passage 53p is the second passage 53p-2 closer to the second fuel cutoff valve 100 than the first connection passage 54p.

  FIG. 6 is an explanatory view illustrating each passage of the lid 50. The opening 55a of the second connection passage 55p is formed in a rectangular shape that intersects with a constant width at a right angle with respect to the axial direction (flow direction) of the external connection passage 53p. A flow path guide member 56 is disposed in the second path 53p-2 of the external connection path 53p. The flow path guide member 56 includes a plurality of guide plates 56a arranged in parallel, and guide passages 56b for allowing fuel to flow between the respective guide plates 56a. The guide plate 56a is configured to guide the fuel that has flowed out of the second fuel cutoff valve 100 into the guide passage 56b and to direct it toward the second connection passage 55p.

FIG. 7 is an exploded sectional view showing the first float mechanism 70. The first float mechanism 70 includes a cylindrical float 71, an upper valve mechanism 75 placed on the float 71, and a spring 78 that supports the float 71. The float 71 has a buoyancy chamber 71S opened downward.
The upper valve mechanism 75 is a valve for improving the restart valve characteristic, and is supported on the upper portion of the float 71 so as to be movable up and down, and includes an upper valve body 76 and a rubber valve body 77 attached to the upper valve body 76. It has. A guide protrusion 76 a is formed on the outer periphery of the upper valve body 76. A claw 76b is formed at the tip of the guide protrusion 76a. The upper valve mechanism 75 is guided in the vertical direction by being disposed in a space surrounded by the guide protrusion 71 a on the upper portion of the float 71. Further, the upper valve mechanism 75 is engaged so that the upper valve mechanism 75 can be raised and lowered within a predetermined distance by the claw 76 b entering the guide hole 71 b of the float 71.
The rubber valve element 77 includes a first seat part 77a that contacts and separates from the seal part 43b of the connection opening 43a shown in FIG. 4, a second sheet part 77b that contacts and separates from the lower valve element 71c of the float 71, and a rubber valve element 77. And a connection hole 77c penetrating in the center portion thereof, and the connection hole 77c is opened and closed by the second seat portion 77b coming into contact with and separating from the lower valve body 71c.

(4) Configuration of Second Fuel Shutoff Valve 100 FIG. 8 is a cross-sectional view showing the second fuel cutoff valve 100. The second fuel cutoff valve 100 includes a second casing 120 and a second float mechanism 150 as main components.
The second casing 120 includes a casing body 130 and a bottom lid 140 attached to the lower portion of the casing body 130, and the casing body 130 and the bottom lid 140 form a second valve chamber 120 </ b> S. The casing main body 130 includes a side wall 132, an upper wall 134, and an extension wall 136. A vent hole 132 a is formed in the upper part of the side wall 132. A second connection opening 134 a is formed at the center of the upper wall 134 of the casing body 130. A space in the extension wall 136 is a communication chamber 136S. The communication chamber 136S is connected to the second connection opening 134a and to the second passage 53p-2 of the external connection passage 53p. The bottom lid 140 is formed with a communication hole 141 for connecting the second valve chamber 120S to the fuel tank.

  The second float mechanism 150 is housed in the second valve chamber 120 </ b> S and includes a float 152 and a spring 155. A substantially conical valve portion 152 a projects from the upper portion of the float 152. The valve portion 152 a is configured to open and close the second connection opening 134 a by raising and lowering the second float mechanism 150. The lower end of the spring 155 is supported by the bottom lid 140 and urges the second float mechanism 150 upward.

(5) Operation of the fuel cutoff device 20 Next, the operation of the fuel cutoff device 20 will be described. FIG. 9 is an explanatory diagram for explaining the operation of the fuel cutoff device 20. The fuel vapor accumulated in the upper part of the fuel tank FT as the fuel level in the fuel tank FT rises due to refueling, vehicle swinging, etc., passes through the first fuel cutoff valve 30 and the second fuel cutoff valve 100 to the canister side. Escaped. That is, the fuel vapor enters the first valve chamber 41S through the first communication hole 46a of the bottom member 45 in the first fuel cutoff valve 30, and passes through the connection opening 43a, the trap chamber 44S, the first chamber from the first valve chamber 41S. It escapes to the canister side through the connection passage 54p and the external connection passage 53p. On the other hand, in the second fuel shut-off valve 100, the fuel vapor passes through the vent hole 132a of the second casing 120 and the communication hole 141 of the bottom cover 140, the second valve chamber 120S, the second connection opening 134a, the communication chamber 136S, the external connection passage. It escapes to the canister side through 53p.

  Then, as shown in FIG. 10, when the fuel level in the fuel tank FT reaches a predetermined first fuel level FL1, the fuel closes the first communication hole 46a of the first fuel cutoff valve 30. The tank internal pressure in the fuel tank FT increases. In this state, the differential pressure between the tank internal pressure and the pressure in the first valve chamber 41S becomes large, and the fuel flows into the first valve chamber 41S through the first communication hole 46a of the bottom member 45 by the siphon action. When the fuel level in the first valve chamber 41S reaches the valve closing level, the upward force due to the buoyancy of the float 71 and the load of the spring 78 and the downward force due to the weight of the float 71 and the upper valve mechanism 75 are reduced. When the former exceeds the latter due to the balance with the force, the float 71 and the upper valve mechanism 75 rise together, and the first seat portion 77a of the upper valve mechanism 75 is seated on the seal portion 43b and connected. The opening 43a is closed. As a result, the tank internal pressure further rises, the fuel level in the inlet pipe (not shown) rises, and when the fuel contacts the nozzle of the fuel gun, the fuel supply is stopped by the sensor. On the other hand, when the fuel level in the fuel tank FT decreases and the fuel in the first valve chamber 41S is discharged through the first communication hole 46a, the float 71 descends with its buoyancy reduced. The first sheet portion 77a of the mechanism 75 is separated from the seal portion 43b and opens the connection opening 43a.

  When the fuel level in the fuel tank FT reaches the second fuel level FL2 due to vehicle inclination or swinging, the fuel passes through the communication hole 141 of the bottom cover 140 of the second fuel cutoff valve 100 to the second level. It flows into the valve chamber 120S. As a result, buoyancy is generated in the second float mechanism 150 and the valve floats 152a of the second float mechanism 150 closes the second connection opening 134a, so that fuel does not flow out to the canister side.

(6) Attachment structure of fuel cutoff device 20 and support 10 FIG. 11 is an exploded perspective view showing the casing 40 of the first fuel cutoff valve 30, and FIG. 12 illustrates an assembly structure of the casing 40 and the support portion 13. It is explanatory drawing to do.
On the main body side wall 42 of the casing main body 41, main body side engaging portions 42b formed from claws at three locations (two locations are shown in FIG. 11) at regular intervals in the circumferential direction are projected. The lid side wall 52 of the lid 50 is formed with a first lid side engaging portion 52a that engages with the main body side engaging portion 42b. The first lid-side engagement portion 52a includes an engagement hole 52c and an engagement piece 52d that is formed from a cantilever that faces the engagement hole 52c and is fixed at the lower end of the lid 50 and extends upward. Yes.
On the lid side wall 52, a second lid side engaging portion 52b is formed. The second lid side engaging portion 52b closes the insertion space 52b-1 formed between the outer peripheral surface of the lid side wall 52 and the engagement piece 52d, and a part of the insertion space 52b-1, and the second An engagement claw 52b-2 projecting toward the inner diameter side is provided on the lid side engagement portion 52b. The second lid side engaging portion 52b is formed to be engaged with the engaging claw 52b-2 by inserting the storage side support portion 16 into the insertion space 52b-1. The storage side support part 16 is arrange | positioned at the outer peripheral side of the engaging location of the main body side engaging part 42b and the 1st cover body side engaging part 52a.

Next, an operation of assembling the fuel cutoff device 20 and an operation of attaching the fuel cutoff device 20 to the support body 10 will be described.
In FIG. 4, first, the first float mechanism 70 (FIG. 7) assembled in advance is housed in the first valve chamber 41 </ b> S of the first fuel cutoff valve 30. Next, the bottom member 45 is assembled to the casing body 41 by engaging the claw 46 b of the bottom member 45 with the engagement hole 42 a of the casing body 41. Further, the gasket 48 is attached to the main body side wall 42 of the casing main body 41. Then, the extended side wall 44 of the casing body 41 is inserted into the storage chamber 50 </ b> S of the lid body 50. Thereby, as shown in FIG. 12, the main body side engaging portion 42b of the casing main body 41 elastically deforms the engaging piece 52d of the lid 50, and the main body side engaging portion 42b engages with the engaging hole 52c, The casing body 41 is integrated with the lid body 50.

  In order to assemble the first fuel cutoff valve 30 to the support portion 13 of the support body 10, first, the second lid side engagement portion 52b of the first fuel cutoff valve 30 is aligned with the storage side support portion 16, and the first The storage side support portion 16 is inserted into the insertion space 52b-1 of the two lid side engagement portion 52b. At this time, the storage side support portion 16 is inserted while elastically deforming the engagement piece 52d, and the claw 16b of the storage side support portion 16 engages with the engagement claw 52b-2 of the second lid side engagement portion 52b. . As a result, the fuel cutoff device 20 is fixed to the support portion 13 of the support 10.

As shown in FIGS. 11 and 12, the casing body 41 and the lid 50 of the casing 40 of the first fuel cutoff valve 30 are assembled and the first fuel cutoff valve 30 is fixed to the support portion 13 of the support body 10. Further, the above-described engagement structure is adopted.
In such an engagement structure, the casing main body 41 and the lid body 50 are integrated by the engagement of the main body side engaging portion 42b and the first lid side engaging portion 52a, and are arranged on the outer peripheral side of this engaging portion. The storage side support portion 16 is engaged with the second lid side engaging portion 52 b of the lid 50. That is, the lid 50 is engaged and firmly integrated with the support portion 13 and the casing body 41 is accommodated inside the lid 50 so that the support portion 13 and the lid 50 are fuel. Even if an external force is received from a different direction due to the wave, the external force is in the direction separating the lid 50 and the casing body 41, that is, between the body side engaging portion 42b and the first lid side engaging portion 52a. It is difficult to act in the direction of expanding the generation.
Therefore, the casing 40 in which the lid 50 and the casing body 41 are firmly integrated can be configured.
Moreover, since the casing 40 can be supported on the support portion 13 by engaging the storage-side support portion 16 of the support portion 13 with the second lid-side engagement portion 52b of the lid body 50, the mounting operation is also easy. is there.

  Further, even if the storage side support portion 16 swells so that the lid side wall 52 of the lid body 50 expands, the diameter of the housing side support portion 16 is restricted from the outer peripheral side of the lid side wall 52. The engagement force between 42b and the first lid side engaging portion 52a of the lid 50 can be maintained. Thus, according to such an engagement mechanism, it is not necessary to set the engagement margin strictly, and the design becomes easy.

(7) Actions and effects of the embodiment The following actions and effects are exhibited by the configuration of the above embodiment.
(7) -1 As shown in FIG. 10, when the fuel level in the fuel tank exceeds the second fuel level FL2, the second fuel shut-off valve 100 causes the fuel to close by the closing operation of the second float mechanism 150. Is prevented from flowing out through the external connection passage 53p. However, when a delay in the closing operation of the second float mechanism 150 occurs or when the second fuel cutoff valve 100 is submerged, the opening periphery of the valve portion 152a of the second float mechanism 150 and the second connection opening 134a. Fuel may leak from the gap. In order to prevent the leaked fuel from flowing to the canister side, the fuel cutoff device 20 has the following configuration.

  As shown in FIG. 5, when the fuel leaked from the second fuel cutoff valve 100 flows out from the second passage 53p-2 of the external connection passage 53p, it passes through the guide passage 56b of the flow path guide member 56, and further to the second connection. It passes through the passage 55p and flows into the trap chamber 44S. Since the trap chamber 44S is provided below the external connection passage 53p, the fuel in the trap chamber 44S is difficult to return to the external connection passage 53p. Therefore, the outflow of fuel from the external connection passage 53p can be prevented.

(7) -2 As shown in FIG. 6, since the flow path guide member 56 includes a guide passage 56b between the guide plates 56a arranged in parallel, the fuel that has entered the guide plate 56a is brought into a rectifying state. Thus, it is possible to reliably lead to the second connection passage 55p. In addition, since the guide passage 56b of the flow path guide member 56 is formed to be inclined slightly downward, the direction of the horizontal fuel flowing out from the second fuel shut-off valve 100 is changed slightly downward, so that the fuel Can be reliably guided to the opening 55 a of the second connection pipe 55.
Further, since the contact area between the fuel and the flow path guide member 56 is increased by the guide plate 56a and the guide passage 56b, the fuel is hardly scattered to the first passage 53p-1.

(7) -3 As shown in FIG. 6, the opening 55a of the second connection passage 55p is formed in a rectangular shape that intersects with a constant width at a right angle to the axial direction (flow direction) of the external connection passage 53p. Therefore, the fuel that has flowed out of the second fuel cutoff valve 100 does not easily get over the opening 55a through the flow path guide member 56, and surely flows into the second connection passage 55p.

(7) -4 As shown in FIG. 10, when the fuel level exceeds the first fuel level FL1, the first float mechanism 70 closes the connection opening 43a. Therefore, the passage to which the trap chamber 44S is connected to the outside is only the first connection passage 54p and the second connection passage 55p arranged in the vertical direction, and the fuel in the fuel tank is externally passed through the other passages. There will be no spillage.
Further, when the first float mechanism 70 descends, the fuel that has entered the trap chamber 44S is quickly returned to the fuel tank FT through the connection opening 43a and the first valve chamber 41S, and stays in the trap chamber 44S for a long time. I don't have to.

(7) -5 As shown in FIG. 5, the fuel that has flown out of the second fuel cutoff valve 100 and entered the second passage 53p-2 does not enter the second connection passage 55p. When it reaches the passage 54p, it flows into the trap chamber 44S through the first connection passage 54p. Therefore, it is possible to further prevent the fuel flowing out from the second fuel cutoff valve 100 from flowing out through the external connection passage 53p.

(7) -6 Since the first connecting pipe 54 is disposed so as to protrude downward from the lid upper wall 51 into the trap chamber 44S, the fuel shutoff device 20 is inclined when fuel is accumulated in the trap chamber 44S. Even so, the fuel level in the trap chamber 44S is unlikely to exceed the opening 54b of the first connection passage 54p, so the fuel in the trap chamber 44S does not easily flow out to the external connection passage 53p through the first connection passage 54p.

(7) -7 Since the diameter D2 of the opening 54b of the first connection pipe 54 is set to be smaller than the diameter D1 of the connection opening 43a, it is difficult for the fuel flowing out from the connection opening 43a to enter the first connection passage 54p. It is difficult to flow out through the connection passage 53p.

(7) -8 Since the central axis of the first connection pipe 54 coincides with the center of the connection opening 43a, the airflow flowing out from the connection opening 43a smoothly flows into the first connection passage 54p and goes to the outside. Discharged. Therefore, the airflow resistance therebetween is small, and the fuel vapor accumulated in the upper part of the fuel tank FT is quickly discharged.

B. Second Embodiment FIG. 13 is a cross-sectional view showing a fuel cutoff device 20B according to a second embodiment. The present embodiment is characterized by the configuration of the second connection pipe 55B that connects the first fuel cutoff valve 30C and the second fuel cutoff valve 100B. The second connection pipe 55B includes a main connection pipe 55B-1 protruding from the lid 50B of the first fuel cutoff valve 30B, a sub-connection pipe 55B-2 protruding from the second fuel cutoff valve 100B, and a main connection pipe 55B- 1 and the sub-connecting pipe 55B-2 are connected to the trap chamber 44S-B through the second connecting passage 55Bp in these pipes. That is, the second connection passage 55Bp is not directly connected to the external connection passage 53Bp, but is connected to the external connection passage 53Bp through the trap chamber 44S-B and the first connection passage 54Bp. In this configuration, the fuel that has flowed out of the second fuel cutoff valve 100B flows directly into the trap chamber 44S-B through the second connection passage 55Bp, and does not go directly to the external connection passage 53Bp. Therefore, the outflow of fuel to the outside can be further prevented.
Note that when the fuel level exceeds the first fuel level FL1, but below the second fuel level FL2, that is, the first fuel cutoff valve 30B is closed, but the second fuel cutoff valve 100B. When is open, ventilation between the inside and outside of the fuel tank is ensured through the second fuel cutoff valve 100B, the second connection passage 55Bp, the trap chamber 44S-B, and the first connection passage 54Bp.

C. 14 is a cross-sectional view showing a fuel cutoff device 20C according to a modification of the second embodiment. This modification is characterized by the configuration of the second connection pipe 55C that connects the first fuel cutoff valve 30C and the second fuel cutoff valve 100C. The second connection pipe 55C includes a connection pipe 55C-1 protruding from the lid 50C of the first fuel cutoff valve 30C and a connection pipe 55C-2 protruding from the second fuel cutoff valve 100C. The two connection passages 55Cp are connected to the trap chamber 44S-C. Further, a seal member 55Ca is interposed between the connecting pipe 55C-1 and the connecting pipe 55C-2.
As described above, various configurations can be adopted for connecting the first fuel cutoff valve and the second fuel cutoff valve, and a plurality of rollover valves are connected to the fuel cutoff device. It may be. Further, the configuration of the fuel cutoff device is not limited to the in-tank type described in the above embodiment, but may be a so-called out-tank type mounted on the upper wall of the fuel tank.
Furthermore, a flexible tube etc. may be used for the 2nd connection pipe other than the structure integrally formed with a casing.

The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations without departing from the spirit thereof.
For example, in the above embodiment, the engagement mechanism between the main body side engagement portion 42b and the first lid side engagement portion 52a and the engagement mechanism between the storage side support portion 16 and the second lid side engagement portion 52b are Describes the structure of the claw and the other hole. However, if the members can be engaged and connected together, the nail is formed on one member and the hole is formed on the other member. In addition to the structure provided, an engagement structure between the claws and the claws may be used.

DESCRIPTION OF SYMBOLS 10 ... Support body 11 ... Damper part 12 ... Support | pillar 13 ... Support part 14 ... Mounting plate 15 ... Side wall 16 ... Storage side support part 16a ... Supporting body 16b ... Claw 20 ... Fuel cutoff device 20B ... Fuel cutoff device 20C ... Fuel cutoff device DESCRIPTION OF SYMBOLS 30 ... 1st fuel cutoff valve 30B ... 1st fuel cutoff valve 30C ... 1st fuel cutoff valve 40 ... Casing 41 ... Casing main body 41S ... 1st valve chamber 42 ... Main body side wall 42a ... Engagement hole 42b ... Main body side engaging part 43 ... Upper wall 43a ... Connection opening 43b ... Sealing portion 44 ... Expansion side wall 44S ... Trap chamber 44S-B ... Trap chamber 44S-C ... Trap chamber 45 ... Bottom member 46 ... Bottom main body 46a ... First communication hole 46b ... Claw 48 ... Gasket 50 ... Lid 50B ... Lid 50C ... Lid 50S ... Storage chamber 51 ... Lid upper wall 52 ... Lid side 52a ... First lid side engaging part 52b ... Second lid side engagement Part 52b-1 ... Insertion space 52b-2 ... Engagement claw 52c ... Engagement hole 52d ... Engagement piece 53 ... External connection pipe 53p ... External connection path 53Bp ... External connection path 53p-1 ... First path 53p-2 ... 2nd passage 54 ... 1st connection pipe 54a ... Opening 54b ... Opening 54p ... 1st connection passage 54Bp ... 1st connection passage 55 ... 2nd connection pipe 55B ... 2nd connection pipe 55B-1 ... Main connection pipe 55B-2 ... Sub-connecting pipe 55B-3 ... connecting pipe 55Bp ... second connecting passage 55C ... second connecting pipe 55C-1 ... connecting pipe 55C-2 ... connecting pipe 55Ca ... sealing member 55Cp ... second connecting passage 55a ... opening 55b ... opening 55p ... Second connection passage 56 ... Flow path guide member 56a ... Guide plate 56b ... Guide passage 70 ... First float mechanism 71 ... Float 71S ... Buoyancy chamber 71a ... Guide protrusion 71b ... Guide 71c ... Lower valve body 75 ... Upper valve mechanism 76 ... Upper valve body 76a ... Guide projection 76b ... Claw 77 ... Rubber valve body 77a ... First seat portion 77b ... Second seat portion 77c ... Connection hole 78 ... Spring 100 ... Second Fuel cutoff valve 100B ... second fuel cutoff valve 100C ... second fuel cutoff valve 120 ... second casing 120S ... second valve chamber 130 ... casing body 132 ... side wall 132a ... ventilation hole 134 ... upper wall 134a ... second connection opening 136 ... Expansion wall 136S ... Communication chamber 140 ... Bottom lid 141 ... Communication hole 150 ... Second float mechanism 152 ... Float 152a ... Valve part 155 ... Spring FT ... Fuel tank

Claims (6)

In a fuel shut-off device that is attached to a fuel tank (FT) and cuts off a communication passage to the outside of the fuel tank.
A first valve chamber (41S) communicating with the fuel tank (FT); a second valve chamber (120S) communicating with the fuel tank and disposed away from the first valve chamber (41S); A casing (40, 120) having an external connection passage (53p) connected to the outside of the fuel tank and connected to the first valve chamber (41S) and the second valve chamber (120S);
The first valve chamber (41S) is connected to the external connection by being raised when the fuel level in the fuel tank stored in the first valve chamber (41S) reaches the first fuel level (FL1). A first float mechanism (70) for closing a passage between the passage (53p) and
Ascending when the fuel level in the fuel tank stored in the second valve chamber (120S) reaches a second fuel level (FL2) higher than the first fuel level (FL1). A second float mechanism (150) for closing a passage between the second valve chamber (120S) and the external connection passage (53p);
With
The casing (40) includes a trap chamber (44S) disposed below the external connection passage (53p), the first valve chamber (41S) and the trap chamber (44S), and the external connection passage (53p). And a first connection passage (54p) that connects the second valve chamber (120S) and a second connection passage (55p) that connects the trap chamber (44S). apparatus. The fuel shut-off device according to claim 1,
The fuel cutoff device, wherein the second connection passage (55p) branches from the external connection passage (53p) and connects the second valve chamber (120S) and the trap chamber (44S). The fuel shut-off device according to claim 2,
A flow path guide member (56) disposed in the external connection passage (53p) for guiding the fuel flowing out from the second valve chamber (120S) to the second connection passage (55p); The member (56) includes a plurality of guide plates (56a) arranged along the passage of the external connection passage (53p), and a plurality of guide passages (56b) formed between the guide plates (56a). A fuel shut-off device. In the fuel cutoff device according to any one of claims 1 to 3,
The casing (40) has a first connection pipe (54) that forms the first connection passage (54p),
The fuel shut-off device, wherein the first connecting pipe (54) projects downward in the trap chamber (44S). The fuel shut-off device according to claim 4,
The casing (40) is provided in a passage between the first valve chamber (41S) and the first connection passage (54p), and has a connection opening (43a) opened and closed by the first float mechanism (70). Have
A fuel cutoff device in which D2 <D1 is set, where D1 is a diameter of the connection opening (43a) and D2 is a diameter of the opening (54b) of the first connection pipe (54). The fuel shut-off device according to claim 1,
The second connection passage (55Bp) is a fuel cutoff device provided in a second connection pipe (55B) that directly connects the second valve chamber (120S) and the trap chamber (44S).

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