JP6334960B2 - Valve device for fuel tank - Google Patents

Description

  The present invention relates to a fuel tank valve device that is attached to a fuel tank of an automobile or the like and prevents fuel from flowing out of the fuel tank.

  A fuel tank of an automobile is provided with a valve device that prevents the fuel in the fuel tank from leaking out of the fuel tank when the automobile turns or tilts. For example, the valve device includes a housing provided with a float chamber and a vent chamber via a partition wall having an opening, a float valve arranged to be movable up and down in the float chamber, and a fuel connected to the housing and communicating with the vent chamber A thing provided with steam piping is known. When the fuel swings, the float valve rises to close the opening, thereby preventing fuel leakage outside the fuel tank.

  However, in the above valve device, when the vehicle runs on a rough road and vibrates up and down, swings left and right, or makes a sudden turn, the opening of the opening due to the float valve is not in time, and the fuel or fuel Splashes may flow into the ventilation chamber through the opening and enter the fuel vapor pipe.

  In order to prevent the above problem, for example, in Patent Document 1 below, a ceiling body having a connection hole, a side wall, and a casing body having a valve chamber surrounded by them, and a casing chamber are fixed to the upper portion of the casing body to form a communication chamber. A lid body projecting from the outer wall of the lid body and having a tubular body portion that forms a pipe passage that connects the outside and the communication chamber; a float that is housed in the valve chamber so as to be movable up and down and opens and closes the connection hole; The lid body has a tube extending portion extending in a substantially cylindrical shape from the connecting chamber side of the tube body portion to the upper side of the connection hole, and the lid body has a flow path in the extending passage of the tube extending portion. A fuel shut-off valve is described in which the inlet is provided on the side opposite to the tube portion with the connection hole as the center.

  Even if the fuel oscillates and liquid fuel flows into the communication chamber from the connection hole, the fuel hits the outer wall of the pipe extension part and returns to the connection hole. It is difficult to enter the extended passage.

  In addition, the pipe extending portion includes a side wall suspended from the ceiling surface of the lid body and a symmetrical guide inclined surface provided from the lower end thereof, and is integrated with the ceiling surface of the lid body without a gap. (See FIGS. 3 and 7 and paragraphs 0018 and 0019).

JP 2013-203279 A

  By the way, the fuel in the fuel tank is normally stored in the fuel tank at a predetermined height from the bottom surface of the fuel tank. However, if the vehicle itself is reversed or rolls over, the fuel is on the ceiling surface of the fuel tank. Will be gathered to the side.

  In this case, in the fuel shut-off valve disclosed in Patent Document 1, fuel accumulates in the communication chamber in the lid body, and the pipe extending portion that extends to the opposite side of the pipe body portion has no gap with respect to the ceiling surface of the lid body. Because of the integrally formed cylindrical shape, the fuel collected on the ceiling surface side of the communication room is easy to enter the extension passage of the pipe extension part through the inlet when the vehicle is turned over or rolls over was there.

  Accordingly, an object of the present invention is to provide a fuel tank valve device that can make it difficult for fuel to enter the fuel vapor discharge port even if the vehicle is turned over or rolls over.

  In order to achieve the above object, the valve device for a fuel tank according to the present invention is provided with a valve chamber on the lower side and a vent chamber on the upper side through a partition wall, and the valve chamber and the vent on the partition wall above the valve chamber. A housing provided with an opening that communicates with the chamber, a fuel vapor pipe connected to the housing so as to communicate with the vent chamber, and a valve chamber that is capable of being raised and lowered. A float valve that closes the opening when rising, a fuel vapor discharge port communicating with the fuel vapor pipe is formed in the inner periphery of the vent chamber, and a cylindrical wall surrounding the fuel vapor discharge port is formed And extending at a predetermined length toward the ventilation chamber, and at least an outer peripheral surface of the cylindrical wall extending from the middle in the extending direction to a distal end in the extending direction, and an inner surface of the ceiling wall of the venting chamber A space is formed between them.

  In the fuel tank valve device of the present invention, the valve chamber includes a first valve chamber and a second valve chamber, and the partition wall is disposed on the first valve chamber and has a first opening. A first partition wall, a second partition wall disposed on the second valve chamber and formed with a second opening, which is higher than the first partition wall; the first partition wall and the second partition wall; The float valve is accommodated in the first valve chamber so as to be able to be raised and lowered, and when the liquid level in the fuel tank reaches the vicinity of the set full tank liquid level, A first float valve that closes the first opening, and a second float valve that is housed in the second valve chamber so as to be movable up and down and closes the second opening when the liquid level in the fuel tank rises abnormally. The cylindrical wall is preferably provided at a position lower than the shelf-like wall portion and higher than the first partition wall. Arbitrariness.

  In the fuel tank valve device of the present invention, it is preferable that ribs extending in the vertical direction are formed on both sides of the cylindrical wall on the inner periphery of the vent chamber.

  In the fuel tank valve device of the present invention, it is preferable that the rib extends upward along the inner wall of the vent chamber so as to contact or be close to the inner surface of the ceiling wall of the vent chamber.

  In the fuel tank valve device of the present invention, the housing is assembled to the valve chamber, a partition wall above the valve chamber, a main body having the opening provided in the partition wall, and an upper portion of the main body. A fuel vapor exhaust port connected to the fuel vapor pipe and connected to the fuel vapor pipe. And the cylindrical wall surrounding the fuel vapor discharge port is formed, the rib is formed on the inner periphery of the cover portion, and the lower end thereof protrudes inward from the inner periphery of the opening of the partition wall. It is preferable to extend.

  According to the fuel tank valve device of the present invention, the fuel level fluctuates due to vehicle swinging, etc., and the float valve does not rise in time, and fuel leaks from the opening provided in the partition wall to the vent chamber side. At this time, it is possible to suppress the fuel from flowing into the fuel vapor discharge port by the cylindrical wall protruding in a predetermined length toward the ventilation chamber. Even if the vehicle rolls over or reverses, a gap is formed between the outer peripheral surface of the cylindrical wall surrounding the fuel vapor outlet and the inner surface of the ceiling wall, and the cylindrical wall is formed at a position lower than the ceiling wall. Therefore, the fuel can be prevented from flowing into the fuel vapor discharge port through the cylindrical wall.

It is a disassembled perspective view which shows one Embodiment of the valve apparatus for fuel tanks of this invention. It is a perspective view of the valve device. The cover which comprises the valve apparatus is shown, (a) is the perspective view, (b) is a perspective view at the time of seeing from the direction different from (a). It is a perspective view of the ceiling wall which comprises the valve apparatus. In the same valve apparatus, it is a perspective view in the state where a part of ceiling wall was fractured. In the same valve apparatus, it is a top view in the state where a part of ceiling wall was fractured. It is a principal part expanded sectional view of the valve apparatus. FIG. 3 is a cross-sectional view of the valve device in a state where the first float valve and the second float valve are lowered. FIG. 6 is a cross-sectional view of the valve device in a state where the first float valve is raised. FIG. 5 is a cross-sectional view of the valve device in a state where the first float valve and the second float valve are raised. FIG. 3 is a cross-sectional view of the valve device in a state where the vehicle is inverted. FIG. 3 is a cross-sectional view of the valve device in a state where the vehicle rolls over at a predetermined angle. The other embodiment of the valve apparatus for fuel tanks of this invention is shown, (a) is sectional drawing in the AA arrow line of (b), (b) is sectional drawing. It is explanatory drawing which shows the other shape of a rib in the valve apparatus. The further another embodiment of the valve apparatus for fuel tanks of this invention is shown, (a) is sectional drawing in the BB arrow line of (b), (b) is sectional drawing.

  Hereinafter, with reference to FIGS. 1-12, one Embodiment of the valve apparatus for fuel tanks of this invention is described.

  As shown in FIGS. 1 and 2, this fuel tank valve device 10 (hereinafter referred to as “valve device 10”) includes a first casing 20 in which a first float valve 30 is accommodated and a first casing mounted below the first casing 20. A cap 25, a second casing 40 in which the second float valve 50 is accommodated, a second cap 55 mounted below the cap, and a cover that is mounted above the first casing 20 and the second casing 40 and connects the two. 60 and a housing 15 composed of a ceiling wall 80 mounted above the cover 60.

  First, the 1st casing 20, the 2nd casing 40, the 1st float valve 30, the 2nd float valve 50, etc. which are accommodated in them are explained.

  The first casing 20 has a cylindrical peripheral wall 21 whose lower side is open. Further, a first partition wall 22 in which a first opening 23 is formed is provided above the first casing 20. An annular wall 22 a is projected from the upper surface of the first partition wall 22 and on the outer periphery of the first opening 23. A plurality of mounting brackets 27 are provided at predetermined locations on the outer peripheral wall 21 of the first casing 20, and the first casing 20 is attached to the fuel tank 1 (see FIGS. 8 to 10) via the mounting bracket 27. It can be installed. A through hole 21 a is formed in the peripheral wall 21 of the first casing 20.

  A first cap 25 is attached to the lower opening of the first casing 20, whereby a first valve chamber V <b> 1 in which the first float valve 30 is accommodated is defined below the first partition wall 22. (See FIG. 8). A through hole 25 a is formed on the bottom surface of the first cap 25. The first valve chamber V1 communicates with the fuel tank through the through hole 25a and the through hole 21a.

  A first float valve 30 is housed in the first valve chamber V1 so as to be movable up and down with a first spring S1 interposed between the first cap chamber 25 and the first cap 25. A swingable valve head 32 is mounted above the first float valve 30 (see FIG. 8).

  On the other hand, the second casing 40 has a cylindrical peripheral wall 41 whose lower portion has a larger diameter and whose upper portion has a smaller diameter. A seal ring 45 is attached to the outer periphery of the upper portion of the second casing 40 whose diameter has been reduced.

  A second partition wall 42 in which a second opening 43 is formed is provided above the second casing 40. As shown in FIG. 8, the second partition wall 42 is formed at a position higher than the first partition wall 22. The second casing 40 has a smaller diameter and a shorter length than the first casing 20. In addition, the 2nd opening 43 has the part which protruded in the cylinder shape from the upper surface of the 2nd partition wall 42, The notch which is not shown in figure is formed in this, The state which the check valve 56 mentioned later contact | abuts (See FIGS. 8 and 9), the second opening 43 is not completely closed.

  A second cap 55 is attached to the lower opening of the second casing 40, so that a second valve chamber V 2 in which the second float valve 50 is accommodated is defined below the second partition wall 42. (See FIG. 8). A through hole 55 a is formed on the bottom surface of the second cap 55.

  Further, a plurality of engaging claws 44 project from the outer periphery of the peripheral wall 41 of the second casing 40. Furthermore, a through hole 41a communicating with the second valve chamber V2 is formed in the peripheral wall 41 of the second casing 40.

  A second float valve 50 is housed in the second valve chamber V2 so as to be movable up and down with a second spring S2 interposed between the second cap chamber 55 and the second cap 55. A valve head 52 is provided above the second float valve 50.

  As shown in FIG. 8, the first float valve 30 or the second float valve 50 compresses the springs S1 and S2 by its own weight when the fuel is not immersed, The first opening 23 and the second opening 43 are held open.

  In the following description, “fuel” means liquid fuel (including fuel droplets), and “fuel vapor” means evaporated fuel.

  In the above state, when the fuel level in the fuel tank rises and the float valves 30 and 50 are immersed in the fuel, the urging forces of the springs S1 and S2 and the buoyancy of the float valves 30 and 50 themselves The float valves 30 and 50 are raised (see FIGS. 9 and 10).

  When the liquid level in the fuel tank reaches the set full liquid level, the first float valve 30 closes the first opening 23 and serves as a full tank regulating valve that prevents further supercharging. The second float valve 50 serves as a fuel outflow prevention valve that closes the second opening 43 to prevent external leakage of the fuel when the liquid level in the fuel tank rises abnormally due to fuel oscillation or the like. Yes.

  In addition, a lid 58 having a plurality of through holes 58a is attached to an upper portion of the peripheral wall 41 of the second casing 40 which has a reduced diameter, and on the inner side and above the second partition wall 42, A check valve 56 having a disk shape and provided with a plurality of through holes 56a is accommodated.

  The check valve 56 has a through hole 58a in the lid 58, a through hole 56a in the check valve 56, and a second opening when the pressure in the fuel tank drops when the first opening 23 is closed by the first float valve 30. While air flows into the fuel tank through a notch 43 (not shown), the air rises when the pressure in the fuel tank increases, opens the second opening 43, and discharges the fuel vapor to the outside of the fuel tank.

  In this embodiment, among the members described above, the first casing 20, the first cap 25, the second casing 40, the second cap 55, and the lid 58 constitute the “main part” of the housing in the present invention. ing.

  Next, the cover 60 that is mounted above the first casing 20 and the second casing 40 and connects and integrates them together, and the ceiling wall 80 that is mounted above the cover 60 will be described.

  As shown in FIG. 3, the cover 60 includes a first cylindrical part 61 having a substantially cylindrical shape, a second cylindrical part 62 having a substantially cylindrical shape, and a first cylindrical part 61 and a second cylindrical part 62. It has the shelf-like wall part 63 which is arrange | positioned and connects both the cylinder parts 61 and 62. FIG. In addition, the diameter of the 1st cylinder part 61 is expanded rather than the 2nd cylinder part 62, Furthermore, the direction of the 1st cylinder part 61 is extended long toward the downward direction rather than the 2nd cylinder part 62. FIG.

  An upper portion of the second casing 40 having a reduced diameter is inserted into the second cylindrical portion 62, and a second partition wall 42 having a second opening 43 is disposed on the inner periphery on the upper end side. (See FIG. 8).

  On the other hand, an upper portion of the peripheral wall 21 of the first casing 20 is mounted below the first cylindrical portion 61, and the first partition wall 22 having the first opening 23 at the lower end opening of the first cylindrical portion 61. A recess 64 formed lower than the shelf-like wall 63 is provided on the periphery of the first opening 23 (see FIG. 8). That is, the concave portion 64 defines a part of the ventilation chamber, and the first opening 23 is formed at the bottom of the concave portion 64, and the first opening 23 is lower than the shelf-like wall portion 63.

  Further, the shelf-like wall portion 63 extends from the peripheral edge of the second opening 43 provided in the second partition wall 42 on the second tube portion 62 side to the first opening 23 of the first partition wall 22 on the first tube portion 61 side. It extends so as to reach the inner periphery of the recess 64 provided on the periphery (see FIGS. 5 and 6). Further, a gap R3 is formed between the shelf-like wall portion 63 and the ceiling wall 80 mounted above the cover 60 (see FIG. 9). In addition, the welding groove | channel 65 is formed in the outer periphery of the upper part of both the cylinder parts 61 and 62 and the outer periphery of the shelf-like wall part 63 (refer Fig.3 (a)).

  As shown in FIG. 3A, a flange 66 is extended from the outer peripheral edge at the lower end of the first cylinder 61, and an annular welding protrusion 66a is provided on the rear peripheral edge thereof (see FIG. 3A). (Refer FIG.3 (b)). The flange portion 66 is disposed above the peripheral wall 21 of the first casing 20, the welding projection 66 a is disposed on the outer periphery of the annular wall 22 a of the first partition wall 22, and the welding projection 66 a is disposed on the first partition wall 22. By welding to the upper surface, the first casing 20 is coupled to the cover 60 (see FIG. 8).

  On the other hand, a plurality of engagement pieces 68 having engagement holes 68a extend downward from the outer periphery of the second cylindrical portion 62. By inserting the reduced diameter upper portion of the peripheral wall 41 of the second casing 40 into the second cylindrical portion 62 and engaging the engagement claws 44 with the engagement holes 68 a of the engagement pieces 68, The two casings 40 are airtightly connected to the cover 60 via the seal ring 45 (see FIG. 8).

  In addition, the connection method to the cover 60 of each casing 20 and 40 is not limited to the said aspect.

  The cover 60 is connected to the casings 20 and 40 as described above, so that the lower openings of the cylindrical portions 61 and 62 are covered with the partition walls 22 and 42 and the ceiling wall 80 is mounted on the upper side. As a result, the upper openings of the cylindrical portions 61 and 62 are covered, and the upper portion of the shelf-like wall portion 63 is covered.

  Accordingly, the first ventilation chamber R1 provided in the first cylinder portion 61 and disposed above the first valve chamber V1, and the first ventilation chamber R1 disposed in the second cylinder portion 62 and disposed above the second valve chamber V2. The “venting chamber” in the present invention is defined by the second venting chamber R2 thus formed and the gap R3 communicating with the first venting chamber R1 and the second venting chamber R2. In the present embodiment, as shown in FIG. 8, the first valve chamber V1 and the second valve chamber V2 are arranged side by side (side by side) in the horizontal direction.

  Further, by mounting the casings 20 and 40 on the cover 60 as described above, the first partition wall 22 of the first casing 20 and the second partition wall 42 of the second casing 40 as shown in FIG. Between the two, the shelf-like wall portion 63 connecting both the partition walls 22 and 42 is disposed. In this embodiment, the first partition wall 22, the second partition wall 42, and the shelf-like wall portion 63 form a “partition wall” in the present invention.

  Further, as shown in FIGS. 3A, 5, and 6, the inner surface of the concave portion 64 of the first opening 23 is formed on the upper surface of the shelf-like wall portion 63 from the second opening 43 side of the second partition wall 42. A groove portion 70 is formed to extend so as to communicate with the. One end portion of the groove portion 70 communicates with the first ventilation chamber R1, the other end portion communicates with the second ventilation chamber R2, and the upper portion communicates with the gap R3.

  As shown in FIG. 6, the groove portion 70 has a path L (from the center of the second opening 43 to the first opening toward the first opening 23 side from the second opening 43 side when the valve device 10 is viewed in plan. Is formed in a straight line so as to be substantially parallel to the path L, located on the opposite side of the fuel vapor discharge port 71 to be described later.

  By the way, in a state where a predetermined amount of fuel is stored in the fuel tank, the first float valve 30 which is a full tank regulating valve is raised and the first opening 23 is closed, the fuel vapor, air, etc. in the fuel tank are mainly The second valve chamber V2, the second opening 43, the second ventilation chamber R2, the groove portion 70 and the gap R3 are sequentially passed to flow to the first ventilation chamber R1, and this flow path is used as an evaporation line. . The groove portion 70 constitutes a part of the evaporation line.

  Moreover, as shown in FIGS. 6-8, it is in the 1st cylinder part 61 in which 1st ventilation chamber R1 was formed, Comprising: The predetermined position of the inner periphery of the said recessed part 64 is connected to 1st ventilation chamber R1. A fuel vapor discharge port 71 (hereinafter referred to as “discharge port 71”) is formed. The discharge port 71 in this embodiment is formed on the side opposite to the groove portion 70 with respect to the path L (see FIG. 6).

  Further, the first tube portion 61 is configured such that a fuel vapor pipe 73 (hereinafter referred to as “pipe 73”) forms an acute angle with the path L so as to communicate with the discharge port 71 and the first vent chamber R1. It is connected to the outer periphery. The connection position of the pipe 73 may be provided at a right angle to the path L, and is not particularly limited.

  Further, as shown in FIGS. 3A, 6, 7, and 8, a tube surrounding the discharge port 71 from the inner periphery of the first tube portion 61 and from the periphery of the discharge port 71. The wall 74 is extended by a predetermined length toward the first ventilation chamber R1. The cylindrical wall 74 in this embodiment extends so as to be substantially parallel to the inner surface of the ceiling wall 80, but the distal end side in the extending direction of the cylindrical wall 74 is separated from the inner surface of the ceiling wall 80. Thus, it may be inclined at a predetermined angle. In addition, the cylindrical wall 74 should just protrude so that the discharge port 71 may be enclosed, and does not need to protrude from the periphery of the discharge port 71. FIG.

  As shown in FIGS. 8 to 10, the cylindrical wall 74 is formed at a position lower than the shelf-like wall portion 63 and higher than the first partition wall 22, and does not contact the inner surface of the ceiling wall 80. It is provided as follows. Further, the cylindrical wall 74 is formed at a position lower than the groove portion 70 constituting a part of the evaporation line (see FIG. 7).

  Further, as shown in FIG. 6, the cylindrical wall 74 is projected in the first ventilation chamber R1 when the valve device 10 is viewed in a plan view (when viewed from the direction facing the partition wall). The distal end portion has a curved shape along the inner periphery of the first ventilation chamber R1. Further, as shown in FIG. 8, the cylindrical wall 74 is formed so that the circumferential one end 74a on the groove 70 side is enlarged in diameter and gradually becomes narrower toward the circumferential other end 74b. Further, the other circumferential end 74b of the cylindrical wall 74 has a jaw shape so as to have a gap C2 with respect to the inner periphery of the first ventilation chamber R1 (see FIG. 6), and the end thereof is the first. It has a shape cut linearly along the vertical direction of the ventilation chamber R1 (see FIGS. 3A and 8).

  And as shown in FIGS. 7-12, the outer peripheral surface of the said cylindrical wall 74 at least from the middle of the extension direction to the extension direction front-end | tip of the ceiling wall 80 which covers the upper direction of 1st ventilation chamber R1 A gap C1 is formed between the inner surface. That is, as in the present embodiment, the cylindrical wall 74 not only extends while forming the gap C1 with respect to the inner surface of the ceiling wall 80, but has a gap C1 in the middle of the extending direction. First, it is inclined so that the distal end side in the extending direction of the cylindrical wall 74 is separated from the inner surface of the ceiling wall 80 from the middle in the extending direction, and between the outer peripheral surface of the cylindrical wall 54 and the inner surface of the ceiling wall 80. The gap C1 may be formed.

  Further, as shown in FIG. 3A and FIGS. 5 to 7, a rib insertion groove 75 is formed on the upper surface of the shelf-like wall portion 63 between the groove portion 70 and the discharge port 71. ing. The rib insertion groove 75 communicates with the gap R3 at the top, communicates with the first ventilation chamber R1 at one end, and is formed obliquely at a predetermined angle with respect to the groove 70 (see FIGS. 5 and 5). (See FIG. 6).

  Further, as shown in FIG. 3A and FIGS. 5 to 8, on the inner circumference of the first cylindrical portion 61, on both sides in the circumferential direction of the cylindrical wall 74, in the vertical direction of the first ventilation chamber R <b> 1. A pair of ribs 76 extending along the line is provided.

  As shown in FIGS. 7 and 8, each rib 76 in this embodiment has a length close to the inner surface of the ceiling wall 80 in a state where the ceiling wall 80 is mounted above the cover 60, and the first ventilation chamber R1. It extends upward along the inner circumference. Each rib 76 may extend so as to contact the inner surface of the ceiling wall 80.

  In addition, each rib 76 has a shape in which a lower end portion 76a extends in an L shape toward the inner diameter direction of the first ventilation chamber R1 (see FIGS. 5 and 8), and the tip thereof is a first partition. The wall 22 extends so as to protrude from the inner peripheral edge of the first opening 23 to the inner diameter side (see FIG. 6).

  Further, as shown in FIG. 3B and FIG. 6, another rib 77 is first spaced from the inner periphery of the lower end of the first tube portion 61 with an equal distance from the ribs 76, 76. The vent chamber R <b> 1 extends in the inner diameter direction, and the tip of the vent chamber R <b> 1 projects to the inner diameter side from the inner periphery of the first opening 23.

  The ceiling wall 80 mounted on the upper side of the cover 60 described above has a long plate shape adapted to the upper surface opening of the cover 60 as shown in FIGS. An annular welding projection 81 projects from the inner peripheral edge of the ceiling wall 80, and the welding projection 81 is inserted into the welding groove 65 on the upper surface of the cover 60 to be welded. A ceiling wall 80 is mounted on the upper side. In addition, the mounting method to the cover 60 of the ceiling wall 80 is not limited to the said aspect.

  In addition, a circular recess 82 is formed on the inner surface of the ceiling wall 80 at one end on the second casing 40 side to prevent interference with the lid 58 mounted above the second casing 40. .

  As shown in FIG. 5, the inner surface of the ceiling wall 80 disposed on the first ventilation chamber R <b> 1 is directed from the second opening 43 side to the first opening 23 side and away from the discharge port 71. An inflow restricting rib 83 extending in the direction is provided.

  As shown in FIGS. 4 to 6, the inflow restriction rib 83 has a first rib 84 and a second rib 85. The first rib 84 has a substantially L-shaped plate shape whose base end side is low and other portions are high (see FIG. 4), and a base end 84a formed lower than the other portions is the rib. It is inserted into the insertion groove 75, and has a shape bent in an R shape so that the tip 84 b is separated from the discharge port 71. On the other hand, the second rib 85 extends in a straight line substantially orthogonal to the first rib 84. Further, an extension rib 87 having the same width extends from the base end side of the second rib 85 toward the discharge port 71 on the extension line. Further, a long plate-like shape disposed at the opening side of the cylindrical wall 74 at a position spaced apart from the extension rib 87 by a predetermined angle with respect to the first rib 84. The cover wall 89 is vertically provided.

  Then, in a state where the ceiling wall 80 is mounted above the cover 60, as shown in FIGS. 5 and 6, the inflow regulating rib 83 passes between the groove portion 70 and the discharge port 71, and the groove portion. 70 is disposed so as to cover the opening on the first ventilation chamber R1 side, and the cover wall 89 is disposed on the opening side of the cylindrical wall 74.

  The shapes of the ribs 83 and 87 and the cover wall 89 are not particularly limited.

  By the way, the air and fuel vapor in the fuel tank, which are discharged to the outside of the fuel tank when refueling into the fuel tank, mainly pass through the first valve chamber V1 and the first opening 23 and pass through the first ventilation chamber R1. , Further flows into the pipe 73 from the discharge port 71 and is discharged to a canister or the like connected to the pipe 73, and this flow path is used as a vent line.

  Note that the cover 60 and the ceiling wall 80 described above form a “cover portion” that is assembled to the upper portion of the main body portion in the present invention.

  Moreover, although the valve apparatus 10 in this embodiment is provided with the two float valves 30 and 50, a float valve may be applied to one valve apparatus.

  Next, the effect of the valve device 10 of the present invention having the above configuration will be described.

  As shown in FIG. 8, when the fuel into the fuel tank is not sufficiently supplied and the first float valve 30 or the second float valve 50 is not immersed in the fuel, the first opening 23 and the second The opening 43 is open.

  When fuel is supplied into the fuel tank in this state, the fuel tank passes through the vent line (the first valve chamber V1, the first opening 23, the first vent chamber R1, the discharge port 71, the pipe 73). Air or fuel vapor is discharged to a canister or the like outside the fuel tank.

  When the fuel is supplied into the fuel tank and the fuel level in the fuel tank rises, the fuel passes through the through hole 25a of the first cap 25 and the through hole 21a of the first casing 20 to form the first valve chamber. When the fuel flows into V1 and the fuel is immersed in the first float valve 30 by a predetermined height or more, the first float valve 30 is lifted by the buoyancy of the first spring S1 and the first float valve 30 itself, as shown in FIG. Since the valve head 32 closes the first opening 23 of the first partition wall 22, the discharge amount of air and fuel vapor in the fuel tank is reduced, and further fuel supply can be prevented.

  Further, when the vehicle turns or greatly tilts and the fuel level in the fuel tank rises, the fuel passes through the through hole 55a of the second cap 55 and the through hole 41a of the second casing 40, and the second valve. When the fuel flows into the chamber V2 and the fuel is immersed in the second float valve 50 by a predetermined height or more, the second float valve 50 is lifted by the buoyancy of the second spring S2 and the second float valve 50 itself, as shown in FIG. Furthermore, since the valve head 52 closes the second opening 43 of the second partition wall 42, the fuel is prevented from flowing into the second ventilation chamber R <b> 2 through the first opening 43, so that the fuel tank is released from the fuel tank. Fuel leakage can be prevented.

  By the way, when the vehicle travels on a rough road and vibrates up and down, swings left and right, or turns sharply, the second opening 43 is not closed due to the rise of the second float valve 50 in time, Fuel or fuel splashes may flow vigorously from the second opening 43 into the second ventilation chamber R2. The fuel that has flowed into the second ventilation chamber R2 enters the first ventilation chamber R1 through the gap R3 on the shelf-like wall portion 63.

  In this embodiment, since the groove part 70 is formed on the shelf-like wall part 63, the fuel flows intensively through the groove part 70 and enters the first ventilation chamber R1, and then is discharged by the inflow restriction rib 83. While being guided so as to flow in a direction away from the outlet 71, it falls along the inflow regulating rib 83 (see FIGS. 6 and 9). Thereafter, the fuel passes through the first opening 23 and flows into the first valve chamber V1, and returns to the fuel tank through the through hole 25a of the first casing 20, so that the fuel that has flowed into the first ventilation chamber R1. Can be made difficult to flow into the discharge port 71.

  At this time, if the momentum of the fuel flowing into the ventilation chamber is large, or if there is no inflow regulating rib 83 as described above, the fuel may enter the discharge port 71 directly. However, in this valve device 10, since the cylindrical wall 74 surrounding the discharge port 71 protrudes from the inner periphery of the first ventilation chamber R 1, it is possible to suppress the fuel from flowing into the discharge port 71. it can.

  In particular, in this embodiment, the first float valve 30 and the second float valve 50 are provided, the partition wall includes the first partition wall 22, the second partition wall 42, and the shelf-like wall portion 63, and the cylindrical wall 74. Has a structure that is lower than the second partition wall 42 and higher than the first partition wall 22.

  Therefore, as described above, the fuel that has entered the ventilation chamber side from the second opening 43 due to the vehicle swinging or the like passes from the second partition wall 42 onto the shelf-like wall portion 63 to the first partition wall 22. 1 flows into the opening 23 and returns to the fuel tank 1 through the first valve chamber V1, but even if it flows in the vicinity of the discharge port 71 on the way, the outer periphery of the cylindrical wall 74 surrounding the discharge port 71 (particularly the upper side) It is possible to suppress the inflow into the discharge port 71 by hitting the wall portion.

  In this embodiment, since the cover wall 89 connected to the inflow regulating rib 83 provided on the ceiling wall 80 side is disposed on the opening side of the cylindrical wall 74, the fuel flows into the discharge port 71. Can be more effectively suppressed.

  Further, in this embodiment, since the pair of ribs 76 are provided on the inner periphery of the first ventilation chamber R1 and on both sides in the circumferential direction of the cylindrical wall 74, the first ventilation is made through the second opening 43. When the fuel leaked to the chamber R1 flows down the inner periphery of the first ventilation chamber R1, the ribs 76 prevent the fuel from flowing into the cylindrical wall 74 and the fuel flows into the discharge port 71. Can be more effectively suppressed.

  Furthermore, in this embodiment, the pair of ribs 76, 76 extend so as to be close to the inner surface of the ceiling wall 80, so that the fuel that has flowed into the first ventilation chamber R1 is caused by the surface tension of the ceiling wall. When flowing along the inner surface of 80, the ribs 76 can be easily dropped and dropped, and the fuel can be easily returned from the first opening 23 into the fuel tank 1. The same effect can be obtained when the rib 76 abuts against the inner surface of the ceiling wall 80.

  Moreover, in this embodiment, the housing 15 is assembled | attached to the upper part of the main-body part which consists of the 1st casing 20, the 1st cap 25, the 2nd casing 40, the 2nd cap 55, and the cover body 58, As shown in FIG. 6, the lower end portion 76 a of the rib 76 protrudes toward the inner diameter side from the inner peripheral edge of the first opening 23. It is growing.

  Thus, since the lower end portion 76a of each rib 76 protrudes inward from the inner peripheral edge of the first opening 23, the fuel that flows into the first ventilation chamber R1 and falls through the ribs 76, It can be reliably guided to the first opening 23. Further, as described above, the housing 15 has a main body portion and a cover portion assembled to the upper portion thereof, and the rib 76 is an inner wall of the cover portion, that is, an inner periphery of the first tube portion 61 of the cover 60. Therefore, compared to the case where ribs are directly formed on the partition wall, it is possible to suppress the occurrence of sink marks and the like during injection molding and improve the surface accuracy of the opening formed on the partition wall. it can.

  By the way, when the vehicle itself reverses or rolls over, the fuel in the fuel tank 1 is collected on the ceiling surface side of the fuel tank 1. FIG. 11 shows a case where the vehicle is reversed, and FIG. 12 shows a case where the vehicle rolls over at a predetermined angle.

  At this time, in this valve device 10, as described above, there is a gap between the outer peripheral surface of the cylindrical wall 74 at least from the middle in the extending direction to the front end in the extending direction and the inner surface of the ceiling wall 80. Since C1 is formed and the cylindrical wall 74 is formed at a position lower than the ceiling wall 80, even if the vehicle is turned over or rolls over, the fuel in the gap C1 is shown in FIG. 11 and FIG. Therefore, fuel can be prevented from flowing into the discharge port 71.

  13 and 14 show another embodiment of the fuel tank valve device of the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The fuel tank valve device 10a of this embodiment (hereinafter referred to as “valve device 10a”) is different in connection angle of the pipe 73 from the above embodiment. That is, as shown in FIG. 13 (a), when the valve device 10a is viewed in a plan view, the cover 60 is placed on the extension line of the path L from the second opening 43 side to the first opening 23 side. A pipe 73 is connected to the outer periphery of the first tube portion 61.

  Further, in this embodiment, the check valve 56 as in the above embodiment is not provided, and the second partition wall 42 in which the second opening 43 is formed is arranged so as to be the same height as the shelf-like wall portion 63. In addition, the second partition wall 42 and the shelf-like wall portion 63 and the ceiling wall 80 are spaced apart from each other to form a second ventilation chamber R2 having a larger volume than that of the above embodiment.

  Furthermore, the rib 83a formed in the middle of the path L from the second opening 43 side to the first opening 23 side has a long plate shape extending linearly along the width direction of the ceiling wall 80. 83 a is arranged so as to be orthogonal to the path L from the inner surface of the ceiling wall 80 on the recess 64 side at the periphery of the first opening 23. Moreover, the rib 83a is arrange | positioned in the position close | similar to the vertical wall 63a of the shelf-shaped wall part 63 (refer FIG.13 (b)). For example, as shown in FIG. 14, the rib may be a long plate-like rib 83 b curved in an arc shape, and is not particularly limited.

  In this embodiment, the fuel that flows into the second ventilation chamber R2 from the second opening 43 and flows toward the first opening 23 is blocked by the rib 83a from moving toward the discharge port 71, and toward the recess 64. It is possible to make it difficult to flow into the discharge port 71 by being dropped, and when the vehicle is reversed, the fuel is accumulated in the gap C1 formed between the outer peripheral surface of the cylindrical wall 74 and the inner surface of the ceiling wall 80. The fuel can be prevented from flowing into the discharge port 71.

  FIG. 15 shows still another embodiment of the fuel tank valve device of the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The fuel tank valve device 10b (hereinafter referred to as “valve device 10b”) of this embodiment includes a first partition wall 22, a second partition wall 42, and a space between the first partition wall 22 and the second partition wall 42. The wall portions 63b are arranged at the same height, whereby the first opening 23 and the second opening 43 are arranged at the same height. Further, the long plate-like rib 83 a is disposed in the middle of the second opening 43 and the first opening 23 in a direction orthogonal to the path L. This rib may be a rib 83b as shown in FIG. 14, and is not particularly limited.

  Also in this embodiment, the fuel that flows into the second ventilation chamber R2 from the second opening 43 and flows toward the first opening 23 is blocked from flowing toward the discharge port 71 by the rib 83a and flows into the discharge port 71. When the vehicle is turned over, the fuel accumulates in the gap C1 formed between the outer peripheral surface of the cylindrical wall 74 and the inner surface of the ceiling wall 80, and the fuel flows into the discharge port 71. Can be suppressed.

1 Fuel tank 10, 10a, 10b Fuel tank valve device (valve device)
15 Housing 20 1st casing 22 1st partition wall 23 1st opening 30 1st float valve 40 2nd casing 42 2nd partition wall 43 2nd opening 50 2nd float valve 60 Cover 63 Shelf-like wall part 71 Fuel vapor discharge port (Vent)
73 Fuel Steam Piping (Piping)
74 cylindrical wall 76 rib 76a lower end 80 ceiling wall C1 gap V1 first valve chamber V2 second valve chamber

Claims (5)

A housing provided with a valve chamber on the lower side and a vent chamber on the upper side through the partition wall, and provided with an opening communicating the valve chamber and the vent chamber on the partition wall above the valve chamber;
A fuel vapor pipe connected to the housing so as to communicate with the vent chamber;
A float valve which is accommodated in the valve chamber so as to be movable up and down, and closes the opening when the fuel liquid surface rises to a predetermined height;
A fuel vapor discharge port communicating with the fuel vapor pipe is formed in the inner periphery of the vent chamber, and a cylindrical wall surrounding the fuel vapor discharge port extends to the vent chamber with a predetermined length. A gap is formed between the outer peripheral surface of the tubular wall at least from the middle in the extending direction to the leading end in the extending direction and the inner surface of the ceiling wall of the vent chamber ,
When viewed from the direction facing the partition wall, the protruding end of the cylindrical wall in the vent chamber extends in a jaw shape so as to have a gap with respect to the inner periphery of the vent chamber. A fuel tank valve device having a portion . The valve chamber comprises a first valve chamber and a second valve chamber,
The partition wall includes a first partition wall disposed on the first valve chamber and having a first opening, and a first partition wall disposed on the second valve chamber and having a second opening. A second partition wall located at a higher position, and a shelf-like wall portion connecting the first partition wall and the second partition wall,
The float valve is housed in the first valve chamber so as to be movable up and down, and when the liquid level in the fuel tank reaches the vicinity of a set full liquid level, a first float valve that closes the first opening; The second valve chamber is housed to be movable up and down, and comprises a second float valve that closes the second opening when the liquid level in the fuel tank rises abnormally,
2. The valve device for a fuel tank according to claim 1, wherein the cylindrical wall is provided at a position lower than a surface of the shelf-like wall portion facing an inner surface of the ceiling wall and higher than the first partition wall.   The fuel tank valve device according to claim 1 or 2, wherein ribs extending in the vertical direction are formed on both sides of the cylindrical wall on the inner periphery of the ventilation chamber.   4. The valve device for a fuel tank according to claim 3, wherein the rib extends upward along the inner wall of the ventilation chamber so as to contact or be close to the inner surface of the ceiling wall of the ventilation chamber. A housing provided with a valve chamber on the lower side and a vent chamber on the upper side through the partition wall, and provided with an opening communicating the valve chamber and the vent chamber on the partition wall above the valve chamber;
A fuel vapor pipe connected to the housing so as to communicate with the vent chamber;
A float valve which is accommodated in the valve chamber so as to be movable up and down, and closes the opening when the fuel liquid surface rises to a predetermined height;
A fuel vapor discharge port communicating with the fuel vapor pipe is formed in the inner periphery of the vent chamber, and a cylindrical wall surrounding the fuel vapor discharge port extends to the vent chamber with a predetermined length. A gap is formed between the outer peripheral surface of the tubular wall at least from the middle in the extending direction to the leading end in the extending direction and the inner surface of the ceiling wall of the vent chamber ,
Ribs extending in the vertical direction are formed on both sides of the cylindrical wall at the inner periphery of the vent chamber,
The housing includes a main body having the valve chamber, a partition wall above the valve chamber, and the opening provided in the partition wall;
It is assembled with the upper part of the main body part, and is composed of a cover part that forms the ventilation chamber between the main body part,
The fuel vapor pipe is connected to the cover portion, and a fuel vapor discharge port communicating with the fuel vapor pipe and the cylindrical wall surrounding the fuel vapor discharge port are formed,
The said rib is formed in the inner periphery of the said cover part, The lower end part is extended so that it may protrude inside from the inner periphery of the opening of the said partition wall, The valve apparatus for fuel tanks characterized by the above-mentioned .