JP2012071639A - Fuel shut-off valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel shut-off valve capable of setting a full-tank liquid level and preventing the generation of the oversupply of oil by a simple structure.SOLUTION: The fuel shut-off valve 10 includes: a casing having a connection passage 33a and a discharge passage 42a; a float mechanism 60 stored in a valve chamber 40S; and a discharge valve 70 for opening and closing the discharge passage 42a. The discharge valve 70 includes: a discharge valve body 74 for opening and closing a discharge passage 42a; a roller 78 for applying an opening/closing force to the discharge valve body 74; and a supporting surface 72a for placing the roller 78 and formed from a recessed surface. By supporting the roller 78 in the center of the supporting surface 72a, the discharge valve body 74 is placed under a closed valve state. By moving the roller 78 on the supporting surface 72a outward in the diametrical direction by an external force, the discharge valve body 74 is brought into an open state.

Description

  The present invention relates to a fuel cutoff valve that is mounted on an upper portion of a fuel tank and that cuts off the communication between the fuel tank and the outside in accordance with the fuel level in the fuel tank.

  Conventionally, patent document 1 etc. are known as this kind of a fuel cutoff valve. That is, the fuel shut-off valve is an evaporative fuel discharge regulating device that regulates communication between the fuel tank and the evaporative fuel discharge pipe that guides the evaporative fuel in the fuel tank to the outside. A first float valve that cuts off the communication between the fuel vapor discharge pipe and the fuel tank when the vicinity of the surface is reached, and the fuel vapor discharge pipe inside the fuel tank when the pressure in the fuel tank exceeds a predetermined value. And a second float valve that prevents the communication by the relief valve when the liquid level in the fuel tank rises abnormally, and closes the first float valve when refueling. While the fuel level is set, supercharging is prevented by closing the second float.

  However, according to the conventional technique, it is necessary to provide a plurality of floats, and there is a problem that the configuration becomes complicated. In addition, the technology that configures the float in two stages and the configuration in which the full tank control valve and the supercharging prevention valve are arranged at different locations are also known, but the configuration becomes complicated or the assembly of the vehicle becomes difficult. May be damaged.

JP 10-297293 A

  An object of the present invention is to provide a fuel cutoff valve capable of setting a full tank liquid level with a simple configuration and preventing supercharging, in consideration of solving the problems of the conventional technology. To do.

  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 or application examples.

[Application Example 1]
Application Example 1 is a fuel shut-off valve that is attached to an upper portion of a fuel tank and that cuts off the communication between the inside and outside of the fuel tank according to the fuel level in the fuel tank.
A casing having a valve chamber communicating with the inside of the fuel tank, a connecting passage connecting the valve chamber and the outside, and a discharge passage disposed at a lower portion of the valve chamber and connecting the valve chamber and the inside of the fuel tank; ,
A float mechanism that is housed in the valve chamber and closes the connection passage according to the fuel level in the valve chamber;
A discharge valve for opening and closing the discharge passage;
With
The discharge valve has a discharge valve body for opening and closing the discharge passage, a rolling element for applying a force for opening and closing the discharge valve body, and a support surface formed with a concave surface on which the rolling element is placed. And
The discharge valve body is closed by supporting the rolling element at the center position of the support surface, and the discharge is performed by the rolling element receiving an external force and moving outward on the support surface in the radial direction. The valve body is configured to be opened.

  According to the fuel cut-off valve of Application Example 1, when the fuel is supplied, the float mechanism is raised, the connection passage is closed, and the tank internal pressure is increased, whereby the automatic stop by the fuel gun can be operated.

  Further, in the discharge valve according to the application example 1, when the fuel level in the vicinity of the fuel cutoff valve is increased due to turning of the vehicle or the like, the rolling element of the discharge valve moves on the concave surface of the support surface by the centrifugal force. Move away from the center on the concave surface. The rolling elements that have moved outwardly apply a force in the valve opening direction to the discharge valve body to open the discharge valve, allowing fuel to flow through the discharge passage. Therefore, when the vehicle is turning, the discharge valve opens and closes in response to the fuel level near the fuel shut-off valve, allowing the fuel to flow into and out of the valve chamber to open and close the float mechanism. By operating, it is possible to prevent the outflow of fuel to the outside and to ensure ventilation to the outside.

[Application Example 2]
In Application Example 2, the discharge valve can be configured to open the discharge valve body by the rolling element moving on the support surface when the discharge valve is inclined at a predetermined angle or more.

[Application Example 3]
The discharge valve according to Application Example 3 is configured so that when a predetermined time has elapsed from a state in which the float mechanism is closed at a fuel level higher than or equal to a predetermined level in the valve chamber, the valve chamber is lowered to an open state. It is possible to adopt a configuration in which the amount of leakage that causes the fuel to flow out is set. With this configuration, it is possible to maintain a state in which the supercharging function is not impaired for a predetermined time, and then promptly shift the float mechanism from the closed state to the open state.

[Other application examples]
As another application example, the discharge valve body includes a valve portion that opens and closes a discharge passage, and a support portion that is formed integrally with the valve portion and has the support surface, and the discharge valve body is moved by moving the rolling element. It can be configured to open the discharge passage by tilting.

  As still another application example, the discharge valve includes a rolling element mounted on a support surface and a discharge valve body having a supported surface that contacts the upper surface of the rolling element, and the rolling element has a support surface. The valve can be configured to open by pushing the supported surface upward by moving radially outward from the center position.

It is sectional drawing which shows the fuel cutoff valve with which the fuel tank of the motor vehicle concerning 1st Example of this invention was mounted | worn. It is sectional drawing which decomposed | disassembled the fuel cutoff valve. It is the perspective view which fractured | ruptured partially and exploded the valve storage case and the float mechanism. It is a perspective view which partially cuts and shows a valve storage case and a discharge valve. It is sectional drawing which decomposed | disassembled the discharge valve. It is sectional drawing which shows a discharge valve. It is explanatory drawing explaining operation | movement of a discharge valve. It is explanatory drawing explaining operation | movement of a fuel cutoff valve. It is explanatory drawing explaining the operation | movement at the time of fuel supply of a fuel cutoff valve. It is explanatory drawing explaining the operation | movement following FIG. It is explanatory drawing explaining the operation | movement at the time of turning of a fuel cutoff valve. It is explanatory drawing explaining the ball valve concerning a prior art. It is sectional drawing which shows the fuel cutoff valve concerning 2nd Example. It is sectional drawing to which the vicinity of the discharge valve was expanded. It is the perspective view which fractured | ruptured and disassembled the discharge valve partially. It is explanatory drawing explaining operation | movement of a discharge valve. It is sectional drawing which shows the discharge valve concerning 3rd Example. It is explanatory drawing explaining operation | movement of a discharge valve.

  In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the present invention will be described below.

A. First Embodiment (1) Schematic Configuration of Fuel Shutoff Valve 10 FIG. 1 is a cross-sectional view showing a fuel shutoff valve 10 mounted on a fuel tank of an automobile according to a first embodiment of the present invention. The surface of the fuel tank FT is made of a composite resin material containing polyethylene, and a mounting hole FTb is formed in the tank upper wall FTa. A fuel shut-off valve 10 is attached to the tank upper wall FTa in a state where the lower part thereof enters the attachment hole FTb. The fuel shut-off valve 10 includes a casing 20, a float mechanism 60, and a discharge valve 70 as main components. The fuel shut-off valve 10 functions as an automatic stop when refueling and prevents supercharging. It is a so-called module valve that functions as a rollover valve that prevents the fuel from flowing out to the canister due to the inclination. Hereinafter, the configuration of the fuel cutoff valve 10 will be described in detail.

(2) Configuration of Each Part of Fuel Shutoff Valve 10 FIG. 2 is an exploded sectional view of the fuel cutoff valve 10. The casing 20 includes a casing main body 30, a valve storage case 40, and a lid 50, and a space in the casing main body 30 is a valve storage chamber 20S.

(2) -1 Casing 20
The casing body 30 is formed in a downward cup shape by a substantially cylindrical side wall portion 31 and an upper wall portion 32 formed integrally with the upper portion of the side wall portion 31. A flange 31 a having a welded portion 31 b for welding the lid 50 is formed on the upper portion of the side wall portion 31. The side wall 31 is formed with a vent hole 31c that communicates between the valve storage chamber 20S and the fuel tank below the flange 31a. A vent wall 33 protruding from the upper side to the side is formed at the center of the upper wall portion 32, and a connection passage 33a communicating with the valve storage chamber 20S is formed in the vent wall 33. An opening peripheral edge of the connection passage 33a on the valve storage chamber 20S side is a seal portion 33b. The opening at the bottom of the casing body 30 is an introduction opening 30a. The introduction opening 30a is set to a predetermined liquid level FL1 (see FIG. 1) that determines the full tank liquid level of the fuel tank FT.

  FIG. 3 is a perspective view in which the valve storage case 40 and the float mechanism 60 are partially broken and disassembled. 2 and 3, the valve storage case 40 is stored in the valve storage chamber 20 </ b> S of the casing body 30, and includes a cylindrical side wall portion 41, a bottom wall portion 42 that closes a lower portion of the side wall portion 41, and a bottom portion. An expansion portion 43 having a diameter increased from the lower portion of the wall portion 42 is provided. A space surrounded by the side wall portion 41 and the bottom wall portion 42 forms a valve chamber 40S, and a space surrounded by the bottom wall portion 42 and the expansion portion 43 is a discharge for storing a discharge valve 70 described later. A valve chamber 43S is formed. The side wall portion 41 is between the side wall portion 31 of the casing body 30 and forms a side communication path 21S for preventing a part of the outer peripheral portion of the valve storage chamber 20S from being lifted by the rising airflow. . The side wall 41 is formed with a side communication hole 41a that communicates the side communication passage 21S and the valve chamber 40S. Further, a discharge passage 42 a that communicates the valve chamber 40 </ b> S and the discharge valve chamber 43 </ b> S is formed at the center of the bottom wall portion 42. The extended portion 43 is a plurality of legs that are fitted to the inner wall of the side wall portion 31, and an engagement claw 43 a is formed on the outer peripheral portion thereof, and is engaged with the engagement hole 31 d of the side wall portion 31 of the casing body 30. As a result, the valve storage case 40 is mounted on the casing body 30.

  In FIG. 2, the lid body 50 includes a lid body 51, a tubular body portion 52 projecting laterally from the center of the lid body 51, and a flange 53 formed on the outer periphery of the lid body 51. Forming. A tube passage 52a is formed in the tube body portion 52. One end of the tube passage 52a is connected to the valve storage chamber 20S through the connection passage 33a, and the other end is connected to the canister (not shown) side. . An inner welded portion 51a to be welded to the welded portion 31b of the casing main body 30 is formed on the inner peripheral side of the lower portion of the lid main body 51, and the tank upper wall FTa ( An outer welded portion 53a to be welded to FIG. 1) is formed.

(2) -2 Float mechanism 60
In FIG. 3, the float mechanism 60 is housed in the valve chamber 40 </ b> S and includes a float 61 and an upper valve mechanism 65. The float 61 includes an upper wall 62 and a side wall 63 projecting in a cylindrical shape from the outer peripheral portion of the upper wall 62, and has a float chamber 61S opened downward. At the center of the upper wall 62, a lower pedestal valve portion 61a is formed. The side wall 63 has eight guide protrusions 63a along the vertical direction and at equal intervals in the circumferential direction, and has an outer diameter slightly smaller than the inner diameter of the valve chamber 40S so that the outer peripheral end follows the inner wall of the valve storage case 40. Is formed. The guide protrusion 63a guides so as to prevent inclination when the float 61 moves up and down by sliding on the inner wall of the valve storage case 40. On the side wall 63, a guide groove 63b is formed between the guide protrusions 63a over the entire length in the vertical direction. The float 61 is supported by a spring 64 that extends between the lower surface of the upper wall 62 and the bottom wall portion 42.

  The upper valve mechanism 65 is a valve for improving the restart valve characteristic, and is supported on the upper portion of the float 61 so as to be movable up and down, and includes an upper valve body 66 and a rubber valve body 69 attached to the upper valve body 66. It has. The upper valve main body 66 is formed of a disc portion 67 and a plurality of guide members 68 that project from the outer periphery of the disc portion 67 with a predetermined gap in the circumferential direction. The guide member 68 is guided in the vertical direction by being inserted into the guide groove 63 b of the float 61. A guide hole 68a is formed in the guide member 68, and the upper valve main body 66 is engaged so as to be able to be raised and lowered within a predetermined distance by causing the engagement claw 63c of the float 61 to enter.

  A valve holding hole 67 a is formed in the central portion of the upper valve body 66. A rubber valve element 69 is mounted in the valve holding hole 67a. The rubber valve element 69 includes a support base portion 69a that is press-fitted and supported in the valve holding hole 67a, an upper seat portion 69b formed on the outer periphery of the support base portion 69a, a connection hole 69c that passes through the support base portion 69a, and a connection hole 69c. A lower seat portion 69d, and the upper seat portion 69b contacts and separates from the seal portion 33b of the connection passage 33a shown in FIG. 3, and the lower seat portion 69d contacts and separates from the lower valve portion 61a. To open and close the connection hole 69c.

(2) -3 Discharge valve 70
FIG. 4 is a partially cutaway perspective view showing the valve storage case 40 and the discharge valve 70, and FIG. 5 is an exploded sectional view of the discharge valve 70. The discharge valve 70 is a valve that allows fuel to flow into and out of the valve chamber 40S, and includes a valve support member 72 that is connected and fixed to the lower portion of the valve storage case 40, a discharge valve body 74 that is held by the valve support member 72, and a rolling element. 78. The valve support member 72 is a disk-shaped member, and has a support surface 72a formed in a concave surface downward toward the center, and four engagement claws 72b are formed upward on the outer peripheral portion thereof. Has been. The engagement claw 72 b is engaged with the engagement hole 44 a of the support wall 44 projecting in a cylindrical shape below the valve storage case 40, so that the valve support member 72 is attached to the valve storage case 40.

  The discharge valve body 74 is configured by assembling the upper valve body 75 and the lower valve body 76, and is a valve body that opens and closes the discharge passage 42a of the bottom wall portion 42. By assembling a member having a larger diameter than the discharge passage 42a. It is configured. That is, the upper valve body 75 includes a disk-shaped upper surface portion 75a, a seal portion 75b formed along the lower outer peripheral portion of the upper surface portion 75a, and an engaging portion 75c protruding from the outer peripheral lower surface of the upper surface portion 75a. And. The seal portion 75b does not have a very high sealing property so as to allow slight leakage when seated on the seal portion 42b, whereby the fuel level in the valve chamber 40S is maintained for a predetermined time (about For 1 minute). On the other hand, the lower valve body 76 includes a lower main body 76a serving as a pedestal, and a connecting leg 76b that protrudes from the center of the lower main body 76a and has an engaging claw 76c. The engaging claw 76c is engaged with the engaging portion 75c. By combining, the upper valve body 75 is assembled to the upper part of the lower valve body 76. A concave groove is formed in the lower valve body 76 from the connecting leg 76b to the lower main body 76a to form a ventilation path 76P. In addition, the lower valve body 76 is formed with a supported surface 76d that is recessed upward and inclined toward the center. The supported surface 76d is disposed to face the support surface 72a, and the valve support member 72 supports the lower valve body 76 by interposing the rolling elements 78.

  In the configuration of the discharge valve 70 shown in FIG. 6, as shown in FIG. 7, when the fuel cutoff valve 10 is inclined by about 5 ° or more, the rolling elements 78 are inclined surfaces of the support surface 72 a of the valve support member 72. , That is, move away from the center on the inclined surface. Since the distance between the support surface 72a and the supported surface 76d of the lower valve body 76 becomes narrower toward the outside in the radial direction, the rolling element 78 pushes the discharge valve body 74 upward to seal the upper surface portion 75a. The portion 75b is separated from the seal portion 42b of the discharge passage 42a, and fuel can flow through the discharge passage 42a.

(3) Operation of the fuel shut-off valve 10 As shown in FIG. 8, when fuel is supplied into the fuel tank FT by refueling, it accumulates in the upper part of the fuel tank FT as the fuel level in the fuel tank FT rises. The fuel vapor enters the valve chamber 40S through the discharge valve chamber 43S, the side communication passage 21S, the side communication hole 41a, and the like, and through the vent hole 31c and the side communication hole 41a, and from the valve chamber 40S through the connection passage 33a and the pipe passage 52a. , Escaped to the canister side. As shown in FIG. 9, when the fuel liquid level in the fuel tank FT reaches the predetermined liquid level FL1, the fuel closes the introduction opening 30a, thereby increasing the tank internal pressure in the fuel tank FT. In this state, the differential pressure between the tank internal pressure and the pressure in the valve storage chamber 20S increases, and the fuel flows into the valve storage chamber 20S. Then, the fuel rises through the side communication passage 21S and flows into the valve chamber 40S from the side communication hole 41a. At this time, the discharge passage 42a in the lower part of the valve chamber 40S is closed by the discharge valve 70, so that the fuel level in the valve chamber 40S rises. When the fuel level in the valve chamber 40S reaches a predetermined height, the buoyancy of the float 61 and the upward force due to the load of the spring 64 are balanced with the downward force due to the weight of the float 61 and the upper valve mechanism 65. When the former exceeds the latter, the float 61 and the upper valve mechanism 65 rise together, and the rubber valve element 69 sits on the seal portion 33b and closes the connection passage 33a. As a result, the tank internal pressure in the fuel tank FT increases. The liquid level in the inlet pipe rises due to the increase in tank internal pressure, and the auto-stop functioning to stop the fueling of the fuel gun is activated.

  In this state, since the discharge valve body 74 of the discharge valve 70 does not have high sealing performance in a state where the discharge passage 42a is closed, the fuel in the valve chamber 40S leaks little by little through the discharge passage 42a. The fuel level of 40S is lowered. However, since the leakage amount is small, the fuel in the valve chamber 40S does not drop rapidly, the float mechanism 60 maintains the tank internal pressure with the connection passage 33a closed, and supercharging by the fuel gun is performed. To prevent.

  Then, as shown in FIG. 10, when the fuel in the valve chamber 40S leaks little by little through the discharge valve 70 and the fuel level in the valve chamber 40S decreases, the float 61 descends with its buoyancy reduced. The valve portion 61a is separated from the lower seat portion 69d to open the connection hole 69c. Due to the communication of the connection hole 69c, the pressure below the upper valve mechanism 65 becomes substantially the same pressure as in the vicinity of the connection passage 33a, so that the force for closing the upper valve mechanism 65 is reduced, and the engagement claw 63c is moved to the guide hole 63c. By engaging the lower end of 68a, the upper valve mechanism 65 is pulled down, the rubber valve body 69 is separated from the seal portion 33b, and the connection passage 33a is opened. Thus, by setting the passage area of the connection hole 69c to be smaller than the passage area of the connection passage 33a, the upper valve mechanism 65 opens with a small force. Such a two-stage valve structure by the upper valve mechanism 65 functions to promote the improvement of the restart valve characteristic.

  As shown in FIG. 11, when the fuel level in the vicinity of the fuel cutoff valve 10 in the fuel tank FT rises due to turning of the vehicle and fuel enters the valve storage chamber 20S and the valve chamber 40S, the float mechanism 60 Rises and closes the connection passage 33a. At this time, in the discharge valve 70, the rolling element 78 moves on the concave surface of the support surface 72a of the valve support member 72, that is, moves away from the center of the concave surface. At this time, since the distance between the support surface 72a and the supported surface 76d of the lower valve body 76 becomes narrower from the center toward the outside, the rolling element 78 pushes up the discharge valve body 74 and the upper surface portion 75a The seal portion 75b is separated from the seal portion 42b of the discharge passage 42a, and fuel can flow through the discharge passage 42a. As described above, when the vehicle is turning, the discharge valve 70 is opened, so that the discharge valve 70 becomes a hindrance to the inflow and outflow of fuel into the valve chamber 40S in response to the fluctuation of the fuel level. Instead, the float mechanism 60 moves up and down.

(4) Effects of fuel cutoff valve 10 The fuel cutoff valve 10 according to the above embodiment provides the following actions and effects.
(4) -1 As shown in FIG. 9, the fuel shut-off valve 10 can actuate an automatic stop by a fueling gun by closing the valve and increasing the tank internal pressure during fueling.

(4) -2 The discharge valve 70 of the fuel cutoff valve 10 does not have a high sealing performance when the discharge valve body 74 closes the discharge passage 42a. The fuel in the chamber 40S leaks little by little through the discharge passage 42a, and the fuel level in the valve chamber 40S decreases. However, since the amount of leakage is small, the fuel level in the valve chamber 40S does not drop rapidly, and the float mechanism 60 maintains the internal pressure of the tank with the connection passage 33a closed, and the excess by the fuel gun. Lubrication can be reliably prevented.

(4) -3 As shown in FIG. 11, when the fuel level in the vicinity of the fuel cutoff valve 10 is raised by turning the vehicle, the rolling element 78 of the discharge valve 70 supports the valve support member 72 by centrifugal force. The concave surface of the surface 72a is moved, that is, moved on the concave surface away from the center. Since the distance between the support surface 72a and the supported surface 76d of the lower valve body 76 becomes narrower from the center toward the outside in the radial direction, the rolling element 78 moved outward pushes up the discharge valve body 74, The seal portion 75b of the upper surface portion 75a is separated from the seal portion 42b of the discharge passage 42a, and fuel can flow through the discharge passage 42a. Therefore, when the vehicle is turning, the discharge valve 70 causes the fuel level in the vicinity of the fuel shutoff valve 10 to quickly respond to the change in the fuel level in the valve chamber 40S, and the fuel is sent to the valve chamber 40S. Since the float mechanism 60 is caused to close and the float mechanism 60 is closed, fuel can be prevented from flowing out to the outside.

(4) -4 FIG. 12 is an explanatory view for explaining a ball valve 100 according to the prior art. A conventional ball valve 100 includes a casing 102 and a sphere 104, and opens and closes a flow path hole 102 a of the casing 102 by the movement of the sphere 104. In such a ball valve 100, as shown in FIGS. 12A and 12B, when it is desired to secure a large flow rate by enlarging the flow passage hole 102a, the sphere 104 must flow without increasing the inclination of the ball valve 100. It does not move from the passage hole 102a and does not open. To solve these problems, the ball 114 is moved at a small inclination angle even when the passage area of the flow passage hole 112a of the casing 112 is the same as in the ball valve 110 shown in FIGS. In order to open the valve, the sphere 114 may be enlarged, but the ball valve 110 itself has a problem of increasing its size. However, as shown in FIG. 6 and FIG. 7, the discharge valve 70 according to the present embodiment is configured such that the rolling element 78 does not directly open and close the discharge passage 42 a, but the discharge valve element moves as the rolling element 78 moves. 74 is linked to amplify and open the opening of the discharge passage 42a, so that the discharge passage 42a having a large passage area can be opened and closed without enlarging the rolling elements 78.

B. Second Embodiment FIG. 13 is a sectional view showing a fuel cutoff valve 10B according to a second embodiment, FIG. 14 is an enlarged sectional view of the vicinity of the discharge valve 70B, and FIG. 15 is a partially broken and exploded view of the discharge valve 70B. It is a perspective view. This embodiment is characterized by the configuration of the discharge valve 70B. The discharge valve 70B includes a valve support member 72B integrally formed at the lower portion of the valve storage case 40B, and a discharge valve body 74B and a rolling element 78B held by the valve support member 72B. The valve support member 72B is a bottomed cylindrical body projecting from the lower surface of the valve storage case 40B, and a discharge passage 72Ba is formed at the center of the bottom. A seal portion 72Bb formed of a step portion is formed at the opening peripheral edge portion of the discharge passage 72Ba.

  The discharge valve body 74B includes a disc-like valve portion 75B. The valve portion 75B is placed on the step seal portion 72Bb, thereby closing the discharge passage 72Ba. A disc-shaped support portion 76B having a larger diameter than the valve portion 75B is formed on the upper portion of the valve portion 75B. The support portion 76B secures a gap Gp between the bottom portion of the valve support member 72B, and when the outer peripheral end of the lower portion of the valve portion 75B is supported by the stepped portion of the seal portion 72Bb, the outer peripheral end is a fulcrum. It is configured to swing as a seesaw. Further, a concave support surface 76Ba is formed in the support portion 76B. The support surface 76Ba is formed in a concave surface downward toward the center, and the rolling element 78B is placed on the support surface 76Ba. The valve portion 75B does not have a very high sealing property so as to allow slight leakage when seated on the seal portion 72Bb.

  In the configuration of the discharge valve 70B, as shown in FIG. 16, when the fuel cutoff valve 10B is tilted by about 5 ° or more, the rolling element 78B moves on the support surface 76Ba, that is, moves away from the center on the concave surface. To move. Since the valve portion 75B is supported by the step portion of the seal portion 72Bb, and a gap Gp is secured between the bottom portion of the valve portion 75B and the valve support member 72B, the rolling element 78B is on the outer peripheral side of the support surface 76Ba. When the valve portion 75B is moved to, the discharge valve body 74B tilts with the contact portion of the valve portion 75B and the seal portion 72Bb as a fulcrum. As a result, the valve portion 75B opposite to the fulcrum is separated from the seal portion 72Bb of the discharge passage 72Ba, and fuel can flow through the discharge passage 72Ba. Therefore, when the discharge valve body 74B is tilted and opened with the outer peripheral end of the valve portion 75B as a fulcrum, the opening degree with the seal portion 72Bb is increased by the seesaw principle, and a large flow rate can be flowed.

C. Third Embodiment FIGS. 17 and 18 are sectional views showing a discharge valve 70C according to a third embodiment. The present embodiment is characterized in that the discharge valve body 74C of the discharge valve 70C is one article. The discharge valve body 74C includes a disc-shaped valve portion 75C and a support portion 76C that is formed in a lower diameter of the valve portion 75C and has a convex supported surface 76Ca from the center toward the outer side in the radial direction. These are formed integrally. A support recess 76Cb for positioning and supporting the rolling element 78C at the center position is formed at the center of the supported surface 76Ca. That is, the support recess 76Cb is formed so as to position the rolling element 78C on the arc surface so that the rolling element 78C moves by a slight inclination and the valve portion 75C does not open. The discharge valve body 74C is supported via a rolling element 78C placed on the support surface 72Ca of the valve support member 72C, so that the discharge passage 42Ca can be opened and closed.

  In the configuration of the discharge valve 70C, as shown in FIG. 18, when the fuel cutoff valve has an inclination of about 5 ° or more, the rolling element 78C moves on the support surface 72Ca, that is, moves away from the center on the concave surface. To move. Accordingly, the discharge valve body 74C is lowered by its own weight, the seat portion 75Ca of the valve portion 75C is separated from the seal portion 42Cb, and the fuel can flow through the discharge passage 42Ca. According to the discharge valve 70C, a large flow rate can be flowed by setting the passage area according to the outer diameter of the seat portion 75Ca of the valve portion 75C.

  The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the invention.

  In the fuel cutoff valve according to the above-described embodiment, the module valve that serves as both the full tank control valve and the rollover valve has been described. However, the present invention is not limited to this, and the valve has a single function of the full tank control valve or the rollover valve. In this case, the valve storage case can be eliminated and the valve storage chamber can be used as a valve chamber.

  Although the spherical body was used as the rolling element 78 in the said Example, it is not restricted to this, As long as it is a member which rolls the support surface which consists of concave surfaces, rods, such as a roller, may be sufficient.

  Further, in the discharge valve according to the above embodiment, the location where the fuel leaks from the valve chamber is between the discharge valve body and the seal portion, but is not limited to this, and the pore formed in the bottom near the discharge passage It may be.

DESCRIPTION OF SYMBOLS 10 ... Fuel cutoff valve 10B ... Fuel cutoff valve 20 ... Casing 20S ... Valve storage chamber 21S ... Side communication passage 30 ... Casing main body 30a ... Introduction opening 31 ... Side wall part 31a ... Flange 31b ... Welding part 31c ... Vent 31d ... Engagement Hole 32 ... Upper wall portion 33 ... Ventilation wall 33a ... Connection passage 33b ... Sealing portion 40 ... Valve storage case 40B ... Valve storage case 40S ... Valve chamber 41 ... Side wall portion 41a ... Side communication hole 42 ... Bottom wall portion 42a ... Discharge passage 42b ... Seal part 42Ba ... Discharge passage 42Ca ... Discharge passage 42Bb ... Seal part 42Cb ... Seal part 43 ... Expansion part 43S ... Discharge valve chamber 43a ... Engagement claw 44 ... Support wall 44a ... Engagement hole 50 ... Lid body 51 ... Lid Main body 51a ... inner welded part 52 ... pipe body part 52a ... pipe passage 53 ... flange 53a ... outer welded part 60 ... float mechanism 61 ... float 6 S ... Float chamber 61a ... Lower valve part 62 ... Upper wall 63 ... Side wall 63a ... Guide protrusion 63b ... Guide groove 63c ... Engaging claw 64 ... Spring 65 ... Upper valve mechanism 66 ... Upper valve body 67 ... Disc part 67a ... Valve holding hole 68 ... Guide member 68a ... Guide hole 69 ... Rubber valve element 69a ... Support base 69b ... Upper seat part 69c ... Connection hole 69d ... Lower seat part 70 ... Drain valve 70B ... Drain valve 70C ... Drain valve 72 ... Valve support Member 72B ... Valve support member 72C ... Valve support member 72a ... Support surface 72b ... Engagement claw 72Ba ... Discharge passage 72Bb ... Sealing part 72Ca ... Support surface 74 ... Discharge valve body 74B ... Discharge valve body 74C ... Discharge valve body 75 ... Top Valve body 75B ... Valve portion 75C ... Valve portion 75a ... Upper surface portion 75b ... Seal portion 75c ... Engagement portion 75Ca ... Seat portion 76 ... Lower valve body 76B ... Support portion 76 ... support part 76P ... ventilation path 76a ... lower main body 76b ... connecting leg 76c ... engagement claw 76d ... supported surface 76Ba ... support surface 76Ca ... supported surface 76Cb ... support recess 78 ... rolling element 78B ... rolling element 78C ... rolling Moving body FT ... Fuel tank FTa ... Upper tank wall FTb ... Mounting hole

Claims (3)

In a fuel shut-off valve that is attached to the upper part of the fuel tank and that cuts off the communication between the inside and outside of the fuel tank according to the fuel level in the fuel tank.
A valve chamber (40S) communicating with the inside of the fuel tank, a connection passage (33a) connecting the valve chamber (40S) and the outside, and the valve chamber (40S) disposed below the valve chamber (40S). And a casing (20) having a discharge passage (42a) connecting the inside of the fuel tank,
A float mechanism (60) housed in the valve chamber (40S) and closing the connection passage (33a) according to the fuel level in the valve chamber (40S);
A discharge valve (70) for opening and closing the discharge passage (42a);
With
The discharge valve (70) includes a discharge valve body (74) for opening and closing the discharge passage (42a), a rolling element (78) for applying a force for opening and closing the discharge valve body (74), A support surface (72a) on which the rolling element (78) is placed and formed as a concave surface;
The discharge valve element (74) is closed by supporting the rolling element (78) at the center position of the support surface (72a), and the rolling element (78) receives an external force to receive the support surface (72a). ) A fuel cutoff valve characterized in that the discharge valve body (74) is opened by moving upward in the radial direction. The fuel cutoff valve according to claim 1,
A fuel cutoff valve configured to open the discharge valve body (74) by moving the rolling element (78) on the support surface (72a) when the discharge valve (70) is inclined at a predetermined angle or more. . The fuel cutoff valve according to claim 1 or 2,
The discharge valve (70) is lowered to a valve open state when a predetermined time has elapsed from a state in which the float mechanism (60) is closed at a fuel level higher than a predetermined level in the valve chamber (40S). As described above, the fuel cutoff valve is set to a leakage amount that causes the fuel in the valve chamber (40S) to flow out.

Images