JP2007022307A - Liquid cutoff valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a liquid level of liquid operating a float. <P>SOLUTION: In a fuel cutoff valve 10, a rise of a liquid level of fuel in a tank raises a float 44, pressing a flapper 70, sliding the flapper 44 and an elastic seal 80 forward, and sealing a sealing portion 22 by the elastic seal 80 to prevent a fuel flow from an opening 22A to an air duct 24 side. The operating direction of the float 44 is different from the sealing direction of the sealing portion 22. This dispenses with provision of the flapper 70 above the upper surface of the float 44 and of the float 44 downward by an amount of the vertical width of the flapper 70, thus enabling to raise the position of the float 44 to increase the liquid level of the fuel operating the float 44. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid shut-off valve that closes a closing portion through which liquid can pass.

  As a liquid shut-off valve, there is one in which a float is provided in a valve body and a valve hole is provided in an upper part of the valve body (see, for example, Patent Document 1).

  In this liquid shut-off valve, a valve is attached above the float, and the valve closes the valve hole when the float is lifted by the buoyancy applied by the liquid.

However, in this liquid shut-off valve, a valve is provided above the float, and the closing direction of the valve hole by the valve is the same as the rising direction of the float. For this reason, it is necessary to install a float below the vertical width of the valve, and it is necessary to lower the liquid level of the liquid to be raised. Therefore, in order to prevent the float from being raised at the liquid level of the liquid that should not close the valve hole and the valve from blocking the valve hole, the liquid level of the liquid to be raised is increased. May be difficult to do.
JP-A-8-67155

  An object of the present invention is to obtain a liquid shut-off valve that can increase the liquid level of the liquid in which the float is operated in consideration of the above facts.

  The liquid shut-off valve according to claim 1 is a float that is actuated by being acted upon by buoyancy by the liquid, and is opened to allow the liquid to pass through and is closed by the operation of the float, and the closing direction of the float is A closing portion different from the operating direction.

  The liquid shut-off valve according to claim 2 is the liquid shut-off valve according to claim 1, wherein the liquid shut-off valve is operated in conjunction with the operation of the float, and is operated in conjunction with the operation of the interlock means. And a closing means for closing the closing portion.

  The liquid shut-off valve according to claim 3 is the liquid shut-off valve according to claim 2, characterized in that the working distance of the float and the working distance of the closing means are different.

  The liquid shut-off valve according to claim 4 is the liquid shut-off valve according to any one of claims 1 to 3, wherein the release of releasing the closing of the closing portion when the operation of the float is released. It is characterized by having means.

  In the liquid shut-off valve according to claim 1, the closing portion is opened so that the liquid can pass through the closing portion, and the float is actuated by buoyancy by the liquid to close the closing portion. The

  Here, the closing direction of the closing portion is different from the operation direction of the float. For this reason, it is possible to eliminate the need to provide a closing structure for closing the closing portion above the float, and to eliminate the need to install a float corresponding to the vertical width of the closing structure. Thereby, the position of a float can be made high and the liquid level of the liquid by which a float is operated can be made high.

  In the liquid shut-off valve according to the second aspect, the interlocking unit is operated in conjunction with the operation of the float, the closing unit is operated in conjunction with the operation of the interlocking unit, and the closing unit closes the blocking part. For this reason, it is possible to close the closing portion with a simple configuration.

  In the liquid shut-off valve according to the third aspect, the working distance of the float and the working distance of the closing means are different. For this reason, the operating force of the float and the operating force of the closing means are different, and the degree of freedom for setting at least one of the buoyancy due to the liquid of the float and the closing force of the closing portion by the closing means can be increased.

  In the liquid shut-off valve according to the fourth aspect, when the operation of the float is released, the release means releases the blockage of the closed portion. For this reason, the obstruction | occlusion of the obstruction | occlusion part can be cancelled | released reliably.

[First Embodiment]
FIG. 1 is a sectional view of a fuel cutoff valve 10 (fuel cut-off valve) according to a first embodiment configured by applying the liquid cutoff valve of the present invention as viewed from the side. FIG. 5 shows an exploded perspective view of the fuel cutoff valve 10 as viewed obliquely from above and front. Furthermore, FIG. 6 shows a sectional view of a tank mechanism 12 of a vehicle (automobile) configured to which the fuel cutoff valve 10 is applied as seen from the side. In the drawing, the upper side is indicated by an arrow UP, and the front of the fuel cutoff valve 10 is indicated by an arrow FR.

  The tank mechanism 12 according to the present embodiment includes a container-like tank 14, and the tank 14 is disposed in the vicinity of the lower side of a vehicle floor (not shown) of the vehicle. A supply pipe 16 is connected to the tank 14, and fuel 18 (fuel liquid) as a liquid is supplied from the supply pipe 16 and stored in the tank 14.

  The fuel cutoff valve 10 according to the present embodiment is fixed in a state of being penetrated through the upper wall of the tank 14, and the fuel cutoff valve 10 projects above and inside the tank 14.

  The fuel shut-off valve 10 includes a substantially cylindrical container-like case 20, and the case 20 has an upper case upper 20A and a lower case lower 20B. The case upper 20A has a substantially cylindrical shape with the upper surface closed, and the case lower 20B has a substantially cylindrical shape with the lower surface closed, and the lower end of the case upper 20A and the upper end of the case lower 20B are welded or fitted together. The case 20 is configured by being fixed and sealed. The fuel cutoff valve 10 is fixed to the upper wall of the tank 14 at the upper end of the case lower 20B, and the upper end of the case lower 20B and the upper wall of the tank 14 are sealed.

  The peripheral wall of the case upper 20A is provided with a seal portion 22 as a closing portion at the front, and the seal portion 22 has a circular opening 22A formed at the center, and the opening 22A moves forward in the case 20 Open in the (horizontal direction). The seal portion 22 protrudes in an annular shape toward the rear in the case upper 20A around the opening 22A, and the rear surface around the opening 22A is planar. A substantially cylindrical through cylinder 24 is integrally provided on the outer peripheral surface of the case upper 20A at the position of the seal portion 22, and the inside of the through cylinder 24 is communicated with the opening 22A, and the axial direction is the case upper. It extends from 20A to the front (horizontal direction). An elastic circular tubular vent pipe 26 is connected to the through cylinder 24, and the vent pipe 26 communicates with outside air (outside the vehicle) via a canister 28.

  A long flat plate-shaped positioning plate 30 constituting positioning means is provided on the inner surface of the peripheral wall of the case upper 20A at the right and left portions, and the positioning plate 30 is erected in the left-right direction from the peripheral wall of the case upper 20A. Has been.

  A pair of guide rails 32 having an L-shaped cross section as a guide member are provided at the front part on the inner surface (lower surface) of the upper wall of the case upper 20A. They are arranged along the front-rear direction so as to face each other in the direction, and are separated into two in the front-rear direction.

  In the case lower 20B, a plurality of circular through holes 34 as through holes are formed through the peripheral wall and the lower wall, and a predetermined number of long rectangular slits 36 as through holes are formed in the peripheral wall (in this embodiment). 2) The through hole 34 and the slit 36 communicate the inside of the case 20 and the tank 14.

  A plurality of elongated flat plate-like fins 38 are disposed on the inner surface of the peripheral wall of the case lower 20B, and the fins 38 are disposed from the upper end to the lower end of the case lower 20B peripheral wall and at the center of the case lower 20B peripheral wall. It protrudes toward the shaft and is arranged at equal intervals along the circumferential direction of the peripheral wall of the case lower 20B.

  An inner surface (upper surface) of the lower wall of the case lower 20B is provided with a substantially cylindrical holding cylinder 40 constituting a holding means at the center, and the holding cylinder 40 protrudes upward from the lower wall of the case lower 20B.

  On the inner surface (upper surface) of the lower wall of the case lower 20B, a support column 42 having a substantially rectangular column shape as a support member is provided at the right and left portions, and the pair of support columns 42 are respectively in the vicinity of the peripheral wall of the case lower 20B. While standing vertically from the lower wall of the case lower 20B, they are opposed to each other in the left-right direction.

  A float 44 (valve float) is provided in the case 20. The float 44 is formed in a substantially cylindrical shape with the upper surface closed, and is disposed inside the plurality of fins 38 and the pair of support columns 42 of the case lower 20 </ b> B. Has been placed. A concave portion 46 is formed in the front side portion of the outer periphery of the float 44, and the concave portion 46 is opened to the outside in the circumferential direction and upward of the float 44.

  The left and right ends of the recess 46 are elongated planar positioning surfaces 48 that constitute positioning means, and the positioning plate 30 of the case upper 20A is disposed immediately before the positioning surface 48. A pair of long rectangular columnar positioning columns 50 constituting positioning means are integrally provided at the rear part of the outer periphery of the float 44, and the pair of positioning columns 50 are vertically moved in a state of approaching and facing each other in the left-right direction. The fins 38 of the case lower 20B are inserted between the fins 38 arranged along the direction. Thereby, the rotation around the central axis of the float 44 is restricted.

  A plurality of rectangular parallelepiped contact protrusions 52 (three in the present embodiment) are integrally provided on the lower surface of the peripheral wall of the float 44, and the contact protrusions 52 are arranged at equal intervals in the circumferential direction of the float 44. , Projecting downward from the lower surface of the peripheral wall of the float 44.

  On the lower surface of the upper wall of the float 44, a substantially cylindrical insertion cylinder 54 constituting a holding means is provided at the center, and the insertion cylinder 54 projects downward from the upper wall of the float 44. The insertion cylinder 54 is inserted into a compression coil spring 56 as urging means, and the upper end of the compression coil spring 56 is locked to the insertion cylinder 54. The compression coil spring 56 is inserted and held in the holding cylinder 40, and the lower end thereof is disposed on the lower wall of the case lower 20B. The compression coil spring 56 urges the float 44 upward. The weight of the float 44 is larger than the urging force of the compression coil spring 56, and the float 44 is in contact (bottomed) with the lower wall of the case lower 20 </ b> B at the plurality of contact protrusions 52.

  A flat pressing inclined surface 58 as a pressing portion is formed in the front surface of the upper surface of the float 44 inside the recess 46, and the pressing inclined surface 58 is inclined upward in the backward direction. Yes.

  The concave portion 46 of the float 44 is integrally provided with an engagement rib 60 having an inverted U-shaped cross section at the right and left portions. The engagement rib 60 protrudes from the concave portion 46 of the float 44 in the left-right direction. ing.

  A crank arm 62 having a substantially U-shaped cross section as a releasing means is disposed in the recess 46 of the float 44. Near the left and right ends of the crank arm 62, support shafts 64 are integrally provided on the outer surface, and the support shaft 64 is rotatably supported on the upper ends of the support pillars 42 of the case lower 20B. It is attached to the case lower 20B. On both inner sides of the crank arm 62, a circular engagement shaft 66 is integrally provided on the inner surface, and the engagement shaft 66 is inserted into the engagement rib 60 of the float 44 to engage with the engagement rib 60. The crank arm 62 is attached to the float 44 in a state where the upward movement of the engagement shaft 66 is restricted by the engagement rib 60.

  A pair of connecting plates 62A constituting a connecting portion are integrally provided at the front portion (right and left central portion) of the crank arm 62, and the pair of connecting plates 62A are each formed into an L-shaped flat plate and the rear portions are downward. And are opposed to each other in the left-right direction. A portion between the lower projecting portions of the rear portions of the pair of connection plates 62A is connected by a circular connection shaft 62B constituting the connection portion, whereby the right side portion and the left side portion of the crank arm 62 are connected. A circular hooking shaft 68 is integrally provided at the front portion of the connecting plate 62A, and the pair of hooking shafts 68 oppose each other in the left-right direction.

  Between the pair of connecting plates 62A of the crank arm 62, there is provided a substantially rectangular parallelepiped box-shaped flapper 70 as interlocking means constituting a closing structure, and the lower surface and the rear surface of the flapper 70 are open. Long flat plate-like slide portions 72 are integrally provided at the left and right ends of the upper end of the flapper 70, and the slide portion 72 protrudes outward in the left-right direction from the flapper 70. The flapper 70 is fitted between the pair of guide rails 32 of the case upper 20A and attached to the case upper 20A at the pair of slide portions 72, and the flapper 70 is attached to the pair of guide rails 32 at the pair of slide portions 72. While being guided, it is slidable in the front-rear direction.

  The left and right outer surfaces of the flapper 70 are integrally provided with a hook rib 74 having a J-shaped cross section below the slide portion 72, and the upper end of the hook rib 74 is connected to the slide portion 72. It is arranged between the separated guide rails 32. The lower side portion of the hook rib 74 is gradually bent forward as it goes downward. When the hook shaft 68 of the crank arm 62 is hooked on the hook rib 74, the hook rib 74 is moved forward. The crank arm 62 is attached to the flapper 70 while being restricted by the hook shaft 68.

  The rear surface of the flapper 70 is a pressed inclined surface 76, and the pressed inclined surface 76 is inclined in the upward direction as it goes rearward at the same angle as the pressing inclined surface 58 of the float 44. 58 is in surface contact. A circular attachment hole 78 is formed through the front wall of the flapper 70.

  A rubber seal 80 as a closing means constituting a closing structure is attached to the flapper 70, and the rubber seal 80 has elasticity. The rubber seal 80 has a disk-shaped seal plate 80A and a substantially circular shaft-shaped mounting shaft 80B. The front end of the mounting shaft 80B is connected to the center of the rear surface of the seal plate 80A, so that the rubber seal 80 has a cross section. It is substantially T-shaped. A triangular pyramid-shaped attachment projection 82 is formed in the vicinity of the seal plate 80A of the attachment shaft 80B, and the attachment projection 82 faces the bottom surface side toward the seal plate 80A. In the mounting shaft 80B, the mounting projection 82 is temporarily contracted and deformed and inserted into the mounting hole 78 of the flapper 70, and the front wall of the flapper 70 is sandwiched between the seal plate 80A and the bottom surface of the mounting projection 82. The rubber seal 80 is attached to the flapper 70, and the seal plate 80A is disposed immediately before the front wall of the flapper 70. The seal plate 80A is spaced rearward from the seal portion 22 of the case upper 20A, and the seal plate 80A does not seal (close) the seal portion 22 (opening 22A).

  Further, when the fuel cutoff valve 10 according to the present embodiment is assembled, the compression coil spring 56 is inserted into the holding cylinder 40 of the case lower 20B. Further, the rubber seal 80 is preferably attached in advance to the flapper 70, the float 44 and the flapper 70 are attached to and connected to the crank arm 62, and the flapper 70 is attached to the case upper 20A. Thereafter, while inserting the insertion cylinder 54 of the float 44 into the compression coil spring 56, the float 44 is inserted into the case lower 20B, and the support shaft 64 of the crank arm 62 is supported by the support column 42 of the case lower 20B. Cover the case lower 20B with the case upper 20A and fix it.

  After inserting the insertion cylinder 54 of the float 44 into the compression coil spring 56 not inserted into the holding cylinder 40 of the case lower 20B, the compression coil spring 56 and the insertion cylinder 54 are inserted into the holding cylinder 40 of the case lower 20B. However, the float 44 may be inserted into the case lower 20B.

  Next, the operation of the present embodiment will be described.

  In the tank mechanism 12 having the above-described configuration, the float 44 has a plurality of contact protrusions 52 which are arranged in the case lower 20 </ b> B because the weight of the float 44 is larger than the urging force of the compression coil spring 56 in the fuel cutoff valve 10. It is in contact with the lower wall. Further, the upward movement of the engagement shaft 66 of the crank arm 62 is restricted to the engagement rib 60 of the float 44, and the forward movement of the hook rib 74 of the flapper 70 is restricted to the hook shaft 68 of the crank arm 62. The seal plate 80A of the rubber seal 80 is spaced rearward from the seal portion 22 of the case upper 20A and does not seal the seal portion 22.

  For this reason, the inside of the tank 14 communicates with the outside air through the through hole 34 and the slit 36 of the case lower 20B, the inside of the case 20, the opening 22A of the seal portion 22, the through cylinder 24 of the case upper 20A, the vent pipe 26 and the canister 28. ing. Thus, air (gas) including fuel vapor (fuel vapor) in the tank 14 can be discharged to the outside air side while the fuel vapor is removed by the canister 28, and outside air can be introduced into the tank 14, and deformation of the tank 14 can be achieved. This can be prevented and the tank 14 can be protected.

  As shown in FIG. 2, the fuel 18 in the tank 14 is swung by the vibration or turning of the vehicle to raise the liquid level of the fuel 18, and the fuel 18 in the case 20 from the through hole 34 and the slit 36 of the case lower 20B. However, when the float 44 is about to flow out from the opening 22A of the seal portion 22 to the through cylinder 24 side of the case upper 20A, not only the urging force of the compression coil spring 56 but also the buoyancy caused by the fuel 18 acts. The float 44 is raised (actuated) when the weight of the float 44 is balanced with the urging force and buoyancy. For this reason, the pressing inclined surface 58 of the float 44 presses the pressed inclined surface 76 of the flapper 70 upward, and the flapper 70 and the rubber seal 80 are slid (operated) forward, whereby the seal plate 80A of the rubber seal 80 is sealed. The portion 22 is sealed to prevent the fuel 18 from flowing out from the opening 22A toward the cylinder 24.

  Further, at this time, the hook shaft 68 of the crank arm 62 is pressed forward by the hook rib 74 of the flapper 70, whereby the crank arm 62 is rotated (operated) around the support shaft 64, and the crank arm 62 is moved. The engaging shaft 66 of the float 44 is raised as the engaging rib 60 of the float 44 rises.

  Further, when the oscillation of the fuel 18 in the tank 14 is stopped and the liquid level is lowered, the float 44 is lowered without being affected by the buoyancy caused by the fuel 18, so that the float 44 is brought into contact with the plurality of contact protrusions 52. It contacts the lower wall of the case lower 20B.

  Further, at this time, the engagement shaft 66 of the crank arm 62 is pressed downward by the engagement rib 60 of the float 44, so that the crank arm 62 is rotated around the support shaft 64 and the flapper 70 is hooked. The rib 74 is pressed backward by the hook shaft 68 of the crank arm 62. For this reason, when the rubber seal 80 is slid rearward together with the flapper 70, the seal of the seal portion 22 by the seal plate 80A of the rubber seal 80 is released.

  Here, since the flapper 70 is slid forward by the rising of the float 44 by the pressing inclined surface 58 of the float 44 and the pressed inclined surface 76 of the flapper 70, the operating direction of the float 44 is made upward, while the seal portion 22. Is sealed forward, and the operating direction of the float 44 and the sealing direction of the seal portion 22 are different by 90 °. For this reason, it is not necessary to provide the flapper 70 above the upper surface of the float 44, the float 44 can be raised to the upper wall of the case 20, and the float 44 is installed below by the vertical width of the flapper 70. Can eliminate the need to do.

  Further, the operation direction of the float 44 is set upward, while the seal portion 22 (opening 22A) is opened forward (in the supply / exhaust shaft direction), and the operation direction of the float 44 and the opening direction of the seal portion 22 are 90 °. Is different. For this reason, it is not necessary to provide the seal portion 22 above the float 44, and the seal portion 22 can be provided on the side of the float 44 (the peripheral wall of the case 20). The need to install the minute float 44 below can be eliminated.

  In addition, the seal portion 22 is provided on the peripheral wall of the case 20 without being provided on the upper wall of the case 20 above the float 44. For this reason, it is not necessary to provide the vent pipe 26 on the upper wall of the case 20, the vent pipe 26 can be provided on the peripheral wall of the case 20, and the float 44 is lowered downward by the vertical width of the vent pipe 26. The need to install can be eliminated.

  Thereby, the position of the float 44 can be increased, and the liquid level (cut-off liquid level) of the fuel 18 where the float 44 is operated can be increased (the liquid level of the fuel 18 where the float 44 is operated is higher than the conventional level). Even if the height is increased, it is possible to prevent the seal plate 80A from sealing the seal portion 22 and to ensure ventilation in the tank 14). For this reason, the level of the fuel 18 when the tank 14 is full can be increased, and the amount of fuel 18 that can be stored in the tank 14 can be increased.

  Further, the flapper 70 is slid forward in conjunction with the rise of the float 44, and the rubber seal 80 is slid forward in conjunction with the forward slide of the flapper 70, so that the seal plate 80A of the rubber seal 80 is sealed. To seal. For this reason, the seal portion 22 can be closed with a simple configuration.

  Further, when the liquid level of the fuel 18 in the tank 14 is lowered, the float 44 is lowered, and the rubber seal 80 is slid rearward together with the flapper 70 by the crank arm 62, so that the seal plate 80 </ b> A of the rubber seal 80. The seal of the seal portion 22 is released. For this reason, it is possible to prevent the seal plate 80A from continuing to adhere (attach) to the seal portion 22 even after the float 44 is lowered, and the seal of the seal portion 22 by the seal plate 80A can be reliably released.

  Further, a compression coil spring 56 is disposed at the center of the float 44 so that there is no space for installing the crank arm 62. Moreover, the support column 42 that supports the support shaft 64 of the crank arm 62 needs to be provided on the case 20 (particularly the case lower 20B), but the support column 42 is conveniently provided on the peripheral wall of the case 20 or in the vicinity of the peripheral wall. For this reason, the crank arm 62 can be installed while making the operation balance of the fuel cutoff valve 10 good by making the crank arm 62 U-shaped in cross section (stitching shape).

  Further, when the angle θ (see FIG. 1) of the pressing inclined surface 58 of the float 44 and the pressed inclined surface 76 of the flapper 70 with respect to the vertical direction is 45 °, the working distance of the float 44 and the flapper 70 and the rubber seal 80 The working distance becomes equal, and the working force of the float 44 and the working force of the flapper 70 and the rubber seal 80 become equal.

  Furthermore, when the angle θ with respect to the vertical direction of the pressing inclined surface 58 of the float 44 and the pressed inclined surface 76 of the flapper 70 is smaller than 45 °, the operating distance of the flapper 70 and the rubber seal 80 is larger than the operating distance of the float 44. At the same time, the operating force of the flapper 70 and the rubber seal 80 becomes larger than the operating force of the float 44.

  On the other hand, when the angle θ with respect to the vertical direction of the pressing inclined surface 58 of the float 44 and the pressed inclined surface 76 of the flapper 70 is larger than 45 °, the operating distance of the flapper 70 and the rubber seal 80 is larger than the operating distance of the float 44. As the force increases, the operating force of the flapper 70 and the rubber seal 80 becomes smaller than the operating force of the float 44.

  In this way, by changing the angle θ of the pressing inclined surface 58 of the float 44 and the pressed inclined surface 76 of the flapper 70 with respect to the vertical direction, the operating force of the float 44 and the operating force of the flapper 70 and the rubber seal 80 can be changed. . Therefore, the buoyancy of the float 44 by the fuel 18 (including the weight of the float 44 and the biasing force of the compression coil spring 56), the closing force of the seal portion 22 by the rubber seal 80, and the crank arm 62 of the seal of the seal portion 22 by the rubber seal 80 The degree of freedom for setting the release force can be increased.

  As shown in FIG. 3, when the vehicle is reversed, the float 44 is lowered (actuated) by its own weight and the urging force of the compression coil spring 56. Therefore, the pressing inclined surface 58 of the float 44 presses the pressed inclined surface 76 of the flapper 70 downward, and the flapper 70 and the rubber seal 80 are slid (operated) forward, whereby the seal plate 80A of the rubber seal 80 is sealed. The portion 22 (opening 22A) is sealed to prevent the fuel 18 from flowing out from the opening 22A toward the cylinder 24.

  Further, as shown in FIG. 4, when the vehicle rolls over, the float 44 is moved (operated) in the lateral direction by the urging force of the compression coil spring 56. For this reason, the pressing inclined surface 58 of the float 44 presses the pressed inclined surface 76 of the flapper 70 in the lateral direction, and the flapper 70 and the rubber seal 80 are slid (operated) forward, whereby the seal plate 80A of the rubber seal 80 is moved. The seal portion 22 (opening 22A) is sealed to prevent the fuel 18 from flowing out from the opening 22A toward the cylinder 24.

[Second Embodiment]
FIG. 7 is a sectional view of a fuel cutoff valve 100 (fuel cutoff valve) according to a second embodiment configured by applying the liquid cutoff valve of the present invention as viewed from the side. FIG. 12 is an exploded perspective view of the fuel cutoff valve 100 as viewed obliquely from above and forward.

  The fuel cutoff valve 100 according to the present embodiment is applied to the same tank mechanism 12 as in the first embodiment.

  The fuel cutoff valve 100 according to the present embodiment has substantially the same configuration as the fuel cutoff valve 10 according to the first embodiment, but differs in the following points.

  The case upper 20A is not provided with the positioning plate 30 and the guide rail 32 in the first embodiment. The case lower 20 </ b> B is not provided with the slit 36 and the support pillar 42 in the first embodiment. The fins 38 of the case lower 20B are arranged at equal intervals along the circumferential direction of the peripheral wall excluding the front portion of the case lower 20B.

  A pair of hinge receivers 102 as support portions are provided at the upper front end of the case lower 20B. The hinge receiver 102 has an upper support portion 102A on the outer side in the left-right direction and a lower support portion 102B on the inner side in the left-right direction. The upper support portion 102A and the lower support portion 102B are formed in a semi-cylindrical shape, respectively. It is open downward and upward.

  The float 44 in the case 20 is disposed inside the plurality of fins 38 of the case lower 20B. The concave portion 46 of the float 44 is formed at the outer peripheral front portion of the float 44 and at the center in the left-right direction of the upper surface. The concave portion 46 is opened to the outer side in the circumferential direction of the float 44 and upward. And the width in the left-right direction is increased.

  A circular shaft 104 is fixed to the center of the upper wall of the float 44 in the recess 46, and the shaft 104 is disposed along the left-right direction. On the front surface of the upper wall of the float 44, a substantially triangular pyramid-shaped protrusion 106 is formed as a pressing portion on the lower surface in the recess 46, and the upper surface of the protrusion 106 is spherical. Further, the float 44 is not provided with the positioning surface 48, the pressing inclined surface 58, and the engaging rib 60 in the first embodiment.

  The crank arm 62 is formed in a substantially rectangular column shape and disposed in the recess 46, and the crank arm 62 is attached to the float 44 with a rear end rotatably supported by the support shaft 104 of the float 44. . A long hole 108 is formed through the front side of the crank arm 62, and the long hole 108 penetrates the crank arm 62 in the left-right direction and is elongated along the longitudinal direction of the crank arm 62.

  The flapper 70 has an L-shaped cross section and has a front wall and an upper wall. The front wall of the flapper 70 protrudes downward from the front end of the upper wall of the flapper 70.

  A circular slide shaft 110 is integrally provided at the rear end of the upper wall of the flapper 70, and the slide shaft 110 protrudes leftward from the flapper 70 and is inserted into the elongated hole 108 of the crank arm 62. Has been inserted. Accordingly, the flapper 70 is rotatably and slidably attached to the crank arm 62, and the lower surface of the rear portion of the upper wall of the flapper 70 is in contact with the upper surface of the protrusion 106.

  A pair of circular hinge shafts 112 are integrally provided at the lower end of the front wall of the flapper 70, and the hinge shaft 112 protrudes outward in the left-right direction from the flapper 70. The hinge shaft 112 is rotatably supported by the upper support portion 102A and the lower support portion 102B of the hinge receiver 102 of the case lower 20B, whereby the flapper 70 is rotatably supported by the case lower 20B.

  Similar to the first embodiment, a rubber seal 80 is attached to the front wall of the flapper 70, and the central axis of the seal plate 80A of the rubber seal 80 and the central axis of the protrusion 106 of the float 44 are flush with each other. Is placed on top. The seal plate 80A is spaced rearward from the seal portion 22 of the case upper 20A, and the seal plate 80A does not seal (close) the seal portion 22 (opening 22A).

  Further, when the fuel cutoff valve 100 according to the present embodiment is assembled, the compression coil spring 56 is inserted into the holding cylinder 40 of the case lower 20B. Further, the rubber seal 80 is preferably attached in advance to the flapper 70, the float 44 and the flapper 70 are attached to and connected to the crank arm 62, and the flapper 70 is attached to the case lower 20B. Thereafter, the float 44 is inserted into the case lower 20B while the insertion cylinder 54 of the float 44 is inserted into the compression coil spring 56, and then the case upper 20A is covered and fixed to the case lower 20B.

  After inserting the insertion cylinder 54 of the float 44 into the compression coil spring 56 not inserted into the holding cylinder 40 of the case lower 20B, the compression coil spring 56 and the insertion cylinder 54 are inserted into the holding cylinder 40 of the case lower 20B. However, the float 44 may be inserted into the case lower 20B.

  Next, the operation of the present embodiment will be described.

  In the tank mechanism 12 having the above-described configuration, the float 44 has a plurality of contact projections 52 that are not connected to the case lower 20B by the weight of the float 44 greater than the urging force of the compression coil spring 56 in the fuel cutoff valve 100 at normal times. It is in contact with the lower wall. Further, the seal plate 80A of the rubber seal 80 is separated rearward from the seal portion 22 of the case upper 20A by the weight of the flapper 70, and the seal portion 22 is not sealed.

  For this reason, the inside of the tank 14 communicates with the outside air through the through hole 34 of the case lower 20B, the inside of the case 20, the opening 22A of the seal portion 22, the through cylinder 24 of the case upper 20A, the vent pipe 26 and the canister 28. Thus, air (gas) including fuel vapor (fuel vapor) in the tank 14 can be discharged to the outside air side while the fuel vapor is removed by the canister 28, and outside air can be introduced into the tank 14, and deformation of the tank 14 can be achieved. This can be prevented and the tank 14 can be protected.

  As shown in FIG. 8, the fuel 18 in the tank 14 is swung by the vibration or turning of the vehicle to raise the liquid level of the fuel 18, and the fuel 18 in the case 20 from the through hole 34 of the case lower 20B is sealed. When the float 44 is about to flow out from the opening 22A of the portion 22 toward the cylinder 24 side of the case upper 20A, not only the urging force of the compression coil spring 56 but also the buoyancy by the fuel 18 acts on the float 44. The float 44 is raised (actuated) when its own weight balances the urging force and buoyancy. For this reason, the protrusion part 106 of the float 44 presses the upper wall rear part of the flapper 70 upward, and the flapper 70 and the rubber seal 80 are rotated (operated) about the hinge shaft 112 of the flapper 70 to the front side (upper side). Thus, the seal plate 80A of the rubber seal 80 seals the seal portion 22, and the outflow of the fuel 18 from the opening 22A toward the cylinder 24 is prevented.

  At this time, the crank arm 62 is moved while the slide shaft 110 of the flapper 70 is slid and rotated with respect to the long hole 108 of the crank arm 62 by the rotation of the flapper 70 about the hinge shaft 112 to the front side. Is pivoted upward (actuated) about the support shaft 104, and the crank arm 62 is raised as the float 44 and the support shaft 104 rise.

  In addition, at this time, the upper surface of the protrusion 106 of the float 44 is made spherical, and the contact area between the protrusion 106 and the flapper 70 is reduced, so that even if the protrusion 106 is slid with respect to the flapper 70, The slip resistance of the protrusion 106 with respect to the flapper 70 can be kept low. Further, since the central axis of the seal plate 80A of the rubber seal 80 and the central axis of the protrusion 106 of the float 44 are arranged on the same plane, the seal plate 80A contacts the seal portion 22 with a uniform force.

  Further, when the oscillation of the fuel 18 in the tank 14 is stopped and the liquid level is lowered, the float 44 is lowered without being affected by the buoyancy caused by the fuel 18, so that the float 44 is brought into contact with the plurality of contact protrusions 52. It contacts the lower wall of the case lower 20B.

  Further, at this time, as shown in FIG. 9, the slide shaft 110 of the flapper 70 is pulled rearward through the crank arm 62 by the lowering of the float 44, and the rubber seal 80 together with the flapper 70 is centered on the hinge shaft 112. By turning to the rear side (lower side), the seal of the seal portion 22 by the seal plate 80A of the rubber seal 80 is released. Thereafter, the slide shaft 110 of the flapper 70 is slid and rotated with respect to the long hole 108 of the crank arm 62 due to vehicle vibration or the like, while the flapper 70 and the rubber seal 80 are lowered (rear side) around the hinge shaft 112 by their own weight. 9), the crank arm 62 is rotated downward about the support shaft 104 by its own weight, and the flapper 70, the rubber seal 80, and the crank arm 62 are returned to the normal state (one point in FIG. 9). (See chain line).

  Here, since the flapper 70 is rotated by the rise of the float 44, the operation direction of the float 44 is raised, while the seal portion 22 is sealed forward, and the operation direction of the float 44 and the seal of the seal portion 22 are sealed. The direction is 90 ° different. In addition, a protrusion 106 of the float 44 that rotates the flapper 70 by raising the float 44 is provided in the recess 46. For this reason, it is not necessary to provide the flapper 70 above the upper surface of the float 44, the float 44 can be raised to the upper wall of the case 20, and the float 44 is installed below by the vertical width of the flapper 70. Can eliminate the need to do.

  Thereby, also in this embodiment, the same effect as the first embodiment can be obtained.

  Further, by changing the distance between the hinge shaft 112 of the flapper 70 and the protrusion 106 of the float 44, the distance between the hinge shaft 112 of the flapper 70 and the rubber seal 80, the working distance of the float 44 and the working distance of the rubber seal 80 are changed. To change the operating force of the float 44 and the operating force of the flapper 70 and the rubber seal 80. Therefore, the buoyancy of the float 44 by the fuel 18 (including the weight of the float 44 and the biasing force of the compression coil spring 56), the closing force of the seal portion 22 by the rubber seal 80, and the crank arm 62 of the seal of the seal portion 22 by the rubber seal 80 The degree of freedom for setting the release force can be increased.

  As shown in FIG. 10, when the vehicle is reversed, the float 44 is lowered (actuated) by its own weight and the urging force of the compression coil spring 56. For this reason, the protrusion part 106 of the float 44 presses the upper wall rear part of the flapper 70 downward, and the flapper 70 and the rubber seal 80 are rotated (actuated) about the hinge shaft 112 of the flapper 70 to the front side. The 80 seal plates 80A seal the seal portion 22 (opening 22A), and the outflow of the fuel 18 from the opening 22A to the through cylinder 24 side is prevented.

  Further, as shown in FIG. 11, when the vehicle rolls over, the float 44 is moved (actuated) in the lateral direction by the urging force of the compression coil spring 56. For this reason, the protrusion part 106 of the float 44 presses the upper wall rear part of the flapper 70 laterally, and the flapper 70 and the rubber seal 80 are rotated (actuated) forward about the hinge shaft 112 of the flapper 70. The seal plate 80A of the rubber seal 80 seals the seal portion 22 (opening 22A), and the outflow of the fuel 18 from the opening 22A to the through cylinder 24 side is prevented.

It is sectional drawing seen from the side which shows the fuel cutoff valve which concerns on the 1st Embodiment of this invention. It is sectional drawing seen from the side which shows the time of the fuel liquid level rise in the fuel cutoff valve which concerns on the 1st Embodiment of this invention. It is sectional drawing seen from the side which shows the time of vehicle reversal in the fuel cutoff valve which concerns on the 1st Embodiment of this invention. It is sectional drawing seen from the side which shows the time of vehicle rollover in the fuel cutoff valve which concerns on the 1st Embodiment of this invention. It is the disassembled perspective view seen from the front diagonal upper part which shows the fuel cutoff valve which concerns on the 1st Embodiment of this invention. It is sectional drawing seen from the side which shows the tank mechanism comprised by applying the fuel cutoff valve which concerns on the 1st Embodiment of this invention. It is sectional drawing seen from the side which shows the fuel cutoff valve which concerns on the 2nd Embodiment of this invention. It is sectional drawing seen from the side which shows the time of the fuel liquid level rise in the fuel cutoff valve which concerns on the 2nd Embodiment of this invention. It is sectional drawing seen from the side which shows the time of the fuel liquid level fall in the fuel cutoff valve which concerns on the 2nd Embodiment of this invention. It is sectional drawing seen from the side which shows the time of vehicle reversal in the fuel cutoff valve which concerns on the 2nd Embodiment of this invention. It is sectional drawing seen from the side which shows the time of vehicle rollover in the fuel cutoff valve which concerns on the 2nd Embodiment of this invention. It is the disassembled perspective view seen from the front diagonal upper direction which shows the fuel cutoff valve which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

10 Fuel shut-off valve (liquid shut-off valve)
18 Fuel (liquid)
22 Sealing part (blocking part)
44 Float 62 Crank arm (release means)
70 Flapper (interlocking means)
80 Rubber seal (blocking means)
100 Fuel shut-off valve (liquid shut-off valve)

Claims (4)

A float actuated by buoyancy by a liquid;
A closed portion that is opened to allow liquid to pass through and is blocked by the operation of the float, and the closing direction is different from the operating direction of the float;
Liquid shut-off valve with Interlocking means operated in conjunction with the operation of the float;
A closing means that is operated in conjunction with the operation of the interlocking means to close the closing portion;
The liquid cutoff valve according to claim 1, further comprising:   3. The liquid shut-off valve according to claim 2, wherein the working distance of the float and the working distance of the closing means are different.   The liquid shut-off valve according to any one of claims 1 to 3, further comprising release means for releasing the blocking of the blocking portion when the operation of the float is released.

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