JP5785053B2 - Valve device - Google Patents

Description

  The present invention relates to a valve device that is attached to a fuel tank of an automobile or the like and is used as a cut valve, a full tank regulating valve, or the like.

  For example, the fuel tank of an automobile is supplied with a cut valve that prevents the fuel in the fuel tank from leaking out of the fuel tank when the automobile is turned or tilted, or the upper limit of the amount of oil supplied when refueling. A full tank control valve, etc. for stopping is installed.

  As the valve, for example, a valve including a housing in which an upper space and a lower space are defined by a partition wall having an opening, and a float valve disposed in the lower space so as to be movable up and down is used. And according to the fuel liquid level in a fuel tank, a float valve raises / lowers, and opening and closing of the opening part of a partition wall is aimed at fuel leakage and a full tank regulation.

  A vent hole communicating with the lower space is formed in the peripheral wall of the housing. Then, when the pressure in the fuel tank rises with the float valve lowered and the opening opened, the fuel vapor in the fuel tank is discharged from the opening through the vent hole, and the canister outside the fuel tank, etc. The pressure in the fuel tank is reduced.

  The vent is provided for discharging fuel vapor. However, when the vehicle shakes, turns, or receives vibration, the fuel in the fuel tank shakes, and the droplet fuel passes through the vent. There was a risk of leakage from the opening.

  As described above, in order to prevent liquid fuel leakage as described above, Patent Document 1 listed below includes a housing provided with a valve seat having an opening in the upper portion, defining a storage space inside, A float valve disposed in the housing storage space so as to be movable up and down, and provided with a through hole in the upper wall surface of the housing to communicate the inside and outside, and a rectangular wall piece on the inside of the housing corresponding to the through hole A fuel leakage prevention valve is described.

  In the above fuel leakage prevention valve, even if fuel splash flows into the housing through the through hole, it collides with a wall piece provided at a position corresponding to the through hole, so that the fuel is difficult to leak from the opening. Yes.

JP 2009-166825 A

  In the fuel leakage prevention valve, when the fuel flows obliquely from the through hole, there is a possibility that the fuel leaks from the opening by entering the housing without colliding with the wall piece. In order to prevent this, when the wall piece is extended along the inner periphery of the housing, the fuel that has flowed obliquely can collide with the wall piece. However, in this case, since the narrow fuel flow path defined between the housing and the wall piece extends long, the flow rate of the fuel flowing into the fuel flow path from the through hole increases, and the opening portion It turns out that there is a problem that it is easy to leak from.

  Accordingly, an object of the present invention is to provide a valve device that can effectively prevent fuel leakage from an opening due to fuel that has flowed obliquely into a valve chamber from a vent hole.

  In order to achieve the above object, the valve device of the present invention is provided with a valve chamber communicating with the inside of the fuel tank below and a vent chamber communicating with the outside of the fuel tank via the partition wall formed with the opening. And a float valve disposed so as to be movable up and down in the valve chamber of the housing, and a vent hole communicating with the valve chamber is formed below the partition wall of the peripheral wall of the housing, A main wall portion having an axial length of the housing and a length in the circumferential direction larger than the vent hole is provided at a position corresponding to the vent hole on the inner periphery of the housing. The sub-wall portion extends from the circumferential end of the wall portion, and the length of the sub-wall portion along the axial direction of the housing is greater than the length of the main wall portion along the axial direction of the housing. It is also characterized by being formed short .

  In the valve device of the present invention, ribs project from the inner surface of the peripheral wall of the housing, the main wall portion is connected to both sides of the rib, and the sub-wall portion is connected to the tip of each main wall portion. Is preferred.

  In the valve device according to the present invention, a plurality of gaps surrounded by ribs and opened at the lower surface are formed inside the float valve, and not all of the gaps are formed on the upper wall of the float valve. It is preferable that a communicating hole is formed.

  In the valve device of the present invention, guide ribs are provided on the outer periphery of the float valve along the axial direction of the float valve, with a length that does not interfere with the main wall portion and the sub wall portion during the lifting operation. It is preferable.

  According to the present invention, even if fuel splashes in the fuel tank or the liquid level of the fuel is inclined due to vibration or turning of the vehicle, the fuel flows into the housing from the vent hole. Since the main wall portion larger than the vent hole is provided at a position corresponding to the vent hole on the inner periphery, the fuel that has flowed into the main wall portion collides, and the momentum is reduced. The fuel can be prevented from leaking from the part to the ventilation chamber. In addition, since the sub-wall portion extends from the circumferential end of the main wall portion, even if the fuel flows in a slanting manner with respect to the vent hole, the fuel collides with the sub-wall portion, and the momentum is increased. It can reduce, and the leak from the opening part of a partition wall can be suppressed.

  And since the axial direction length of a subwall part is formed shorter than the axial direction length of a main wall part, the fuel which flowed in in the housing from the vent hole collided with the main wall part, and a peripheral wall and a main wall When flowing into the wide space in the housing through the gap between the peripheral wall and the sub-wall part, the flow path flowing through the gap between the peripheral wall and the sub-wall part is short in the axial direction. Since a part of the flow is opened to a wide space on the way, it is possible to reduce the fuel flow velocity and prevent the collision with the opening of the partition wall. As a result, it is possible to effectively prevent the fuel from colliding with the opening of the partition wall at a high speed before the float valve is closed and causing a leak.

It is a disassembled perspective view which shows one Embodiment of the valve apparatus which concerns on this invention. It is sectional drawing of the valve apparatus. It is a principal part expansion perspective view of the valve apparatus. It is a bottom view of the housing which comprises the valve apparatus. The main wall part and subwall part of the valve apparatus are shown, (a) is the front view, (b) is sectional drawing in the BB arrow line of (a). The float valve which comprises the valve apparatus is shown, (a) is a top view, (b) is a bottom view, (c) is sectional drawing in the AA arrow line of (a). It is sectional drawing in the state orthogonal to FIG. 3 of the valve apparatus. FIG. 8 is a sectional view when the float valve in FIG. 7 is raised in the valve device. In the swing test of the valve device, (a) is a schematic plan view showing a state in which the swing direction of the swing tester and the connection pipe of the valve device are set in alignment, and (b) is connected to the swing direction. FIG. 4C is a schematic plan view showing a state where the tube is set orthogonally, and FIG. 5C is a schematic plan view showing a state where the swinging direction and the direction of the connecting tube are set at 45 °.

  Hereinafter, with reference to FIGS. 1-8, one Embodiment of the valve apparatus of this invention is described.

  As shown in FIGS. 1 and 2, the valve device 10 includes a housing 20 in which a valve chamber R1 is formed below and a ventilation chamber R2 is formed above a partition wall 33, and the inside of the valve chamber R1 of the housing 20 is inside the valve chamber R1. And a float valve 80 arranged to be movable up and down.

  The housing 20 in this embodiment includes a substantially cylindrical housing body 30, a lower cap 60 that is mounted in a lower opening of the housing body 30, and an upper cap 70 that is mounted above the housing body 30. It is configured. As shown in FIG. 2, the housing body 30 and the lower cap 60 define the valve chamber R1 communicating with the fuel tank 1, and the housing body 30 and the upper cap 70 communicate with the outside of the fuel tank 1. A ventilation chamber R2 is defined.

  The housing body 30 includes a substantially cylindrical peripheral wall 31 that is open at the bottom, and a disk-shaped partition wall 33 that closes the upper surface thereof. A circular opening 35 is formed at the center of the partition wall 33, and the valve chamber R1 and the vent chamber R2 are communicated with each other. A cylindrical valve seat 35a protrudes from the periphery of the lower surface of the opening 35 at a predetermined height (see FIG. 2).

  As shown in FIG. 1, a box-shaped valve accommodating portion 36 is provided at a predetermined position on the outer periphery of the housing body 30, and an opening 36a for contacting and separating the ball valve 37 is formed on the bottom wall thereof. (See FIG. 2). A ball valve 37 is accommodated in the valve accommodating portion 36, a ball valve spring 38 is accommodated, the ball valve 37 is urged toward the opening 36a, and the opening 36a is always closed. In addition, a connecting pipe 39 to which a pipe communicating with a canister (not shown) is connected is integrally formed in the valve housing portion 36. When the pressure in the fuel tank increases to a predetermined value or more, the ball valve 37 separates from the opening 36a against the urging force of the ball valve spring 38, and the fuel vapor passes outside the fuel tank through the connection pipe 39. It is supposed to be discharged.

  A frame-shaped cap mounting portion 41 protrudes from the upper surface of the partition wall 33 of the housing body 30 and the valve accommodating portion 36, and the upper cap 70 is attached to the upper opening thereof. . Further, an engagement piece 41 a is extended from the side of the cap mounting portion 41 opposite to the connection pipe 39, and this engages with the bracket 3 shown in FIG. The valve device 10 can be attached to. Further, a plurality of engaging protrusions 43 are provided below the peripheral wall 31 along the circumferential direction.

  A vent hole 45 communicating with the valve chamber R <b> 1 is formed below the partition wall 33 of the peripheral wall 31. The vent hole 45 allows fuel vapor or fuel in the fuel tank 1 to flow into the valve chamber R1, or allows air outside the fuel tank 1 to flow into the fuel tank 1. As shown in FIGS. 3 and 4, in the present embodiment, above the peripheral wall 31, almost directly below the partition wall 33, orthogonal to the connection pipe 39 and the engagement piece 41 a, and around the peripheral wall 31. A pair of circular ventilation holes 45 are formed at positions facing the direction. Moreover, as shown in FIG.4 and FIG.5 (b), a pair of vent holes 45 and 45 are formed in the surrounding wall 31 so that it may become substantially mutually parallel.

  Note that, for example, three or more vent holes 45 are arranged in the circumferential direction of the peripheral wall 31, a plurality of the vent holes 45 are arranged in the axial direction of the peripheral wall 31, and further, those arranged in the circumferential direction of the peripheral wall 31 are along the axial direction. A plurality of them may be arranged, and can be appropriately formed according to the shape, application location, etc. of the fuel tank 1 to which the valve device 10 is attached.

  A main wall portion 50 is formed at a position corresponding to the vent hole 45 on the inner periphery of the peripheral wall 31. As shown in FIGS. 3 to 5, in the present embodiment, the ribs 48 are predetermined so as to be parallel to the opening direction of the air holes 45 from between the pair of air holes 45, 45 on the inner periphery of the peripheral wall 31. The main wall portions 50 and 50 each having a rectangular plate shape are connected to both sides of the tip portion of the rib 48. The rib 48 and the main wall portions 50, 50 are connected at their upper end surfaces to the lower surface of the partition wall 33 (see FIGS. 2 and 5A).

  As shown in FIGS. 5A and 5B, each main wall portion 50 has a length H1 in the axial direction of the housing body 30 (hereinafter referred to as “axial length H1”) and a length L1 in the circumferential direction. (Hereinafter referred to as “circumferential length L1”) is formed larger than the inner diameter of the vent hole 45 so that the entire vent hole 45 can be covered. Specifically, the axial length H1 is preferably 1 to 2 times the axial length of the vent hole 45 (in this embodiment, since it forms a circular hole, its diameter), and the circumferential length L1. Is preferably 1 to 1.7 times the circumferential length of the ventilation hole (in this embodiment, it has a circular hole and its diameter).

  Further, as shown in FIG. 5B, each main wall portion 50 has a cross-sectional shape that is gently curved along the circumferential direction of the peripheral wall 31, and between the peripheral wall 31 and the main wall portion 50. The width of the fuel flow path F1 defined therebetween, that is, the width of the fuel flow path F1 in the radial direction of the housing body 30 is substantially constant when the housing body 30 is viewed from the axial direction. As shown in FIG. 5A, in this embodiment, the main wall portion 50 is a portion near the lower end in the axial direction and covers the vent hole 45 at a position slightly away from the rib 48. It has become.

  A rectangular plate-like sub-wall portion 52 extends from the circumferential tip of each main wall portion 50 having the above structure.

  Each of the sub-wall portions 52 has a length H2 in the axial direction of the housing body 30 (hereinafter referred to as “axial length H2”) shorter than the axial length H1 of the main wall portion 50. Yes. Specifically, the axial length H <b> 2 of each sub-wall portion 52 is preferably 0.6 to 0.8 times the axial length H <b> 1 of the main wall portion 50.

  In addition, each sub-wall portion 52 in this embodiment has a length L2 in the circumferential direction of the housing main body 30 (hereinafter referred to as “circumferential length L2”) than the circumferential length L1 of the main wall portion 50. It is short. Specifically, the circumferential length L <b> 2 of each sub-wall portion 52 is preferably 0.4 to 0.6 times the circumferential length L <b> 1 of the main wall portion 50.

  Further, as shown in FIG. 5B, each sub-wall portion 52 has a shape slightly bent with respect to the main wall portion 50 so as to approach the peripheral wall 31 toward the radially outer side of the housing body 30. As the sub-wall portion 52 extends, the distance between the peripheral wall 31 and the sub-wall portion 52 is gradually narrowed. In addition, each sub-wall part 52 has the upper end surface connected with the lower surface of the said partition wall 33 similarly to the said rib 48 and each said main wall part 50 (refer FIG.2 and FIG.5 (a)).

  Moreover, as shown in FIG.5 (b), the inclination | tilt angle (theta) of each subwall part 52 with respect to the tangent C in the internal peripheral surface of the circumferential direction front-end | tip part of the said main wall part 50 is 10-13 degrees. preferable.

  The lower cap 60 attached to the lower opening of the housing body 30 having the above structure has a circular bottom wall 61 and a peripheral wall 63 erected from the periphery of the bottom wall 61. The bottom wall 61 is formed with a through-hole 61a through which fuel can pass, and a support projection 61b that supports one end of the float valve spring 65 is projected from the center thereof. Further, the peripheral wall 63 is formed with engagement holes 63a with which the engagement protrusions 43 of the housing body 30 are engaged at predetermined intervals.

  The float valve 80 accommodated in the valve chamber R1 so as to be movable up and down has a cylindrical peripheral wall 81 and an upper wall 83 that closes the upper surface opening. As shown in FIGS. 2 and 6C, the upper wall 83 is an inclined surface that protrudes highest at the center and gradually decreases in height toward the outer diameter direction. From the center of the upper wall 83, a valve head 83a that projects from the valve seat 35a of the housing body 30 and opens and closes the opening 35 is projected (see FIGS. 7 and 8).

  As shown in FIGS. 1 and 6, a plurality of guide ribs 85 extending along the axial direction of the float valve 80 are provided on the outer periphery of the peripheral wall 81 at predetermined intervals in the circumferential direction. These guide ribs 85 are in sliding contact with the inner periphery of the peripheral wall 31 of the housing main body 30 so that the lift operation of the float valve 80 is guided. Of these guide ribs 85, predetermined guide ribs 85 a and 85 a provided at positions facing the circumferential direction of the float valve 80 are raised when the float valve 80 is raised (see FIG. 8). In order not to interfere with the sub-wall portion 52, the length does not reach the upper wall 83 and is shorter than the other guide ribs 85 (see FIG. 1).

  Further, as shown in FIGS. 1 and 6A, from the position of the upper outer periphery of the peripheral wall 81 aligned with the short guide rib 85a, it is slightly in front of the long guide ribs 85, 85 provided on both sides thereof. The recesses 87 and 87 are formed to face each other in the circumferential direction. When the float valve 80 is raised, the main wall 50 and the sub-wall 52 enter the recesses 87 and 87, and interference between the float valve 80 and the main wall 50 and the sub-wall 52 is prevented. (See FIG. 8). As shown in FIG. 1, a plurality of opening holes 89 communicating with the inner periphery of the float valve 80 are formed at predetermined positions on the outer periphery of the lower portion of the peripheral wall 81.

  As shown in FIGS. 6B and 6C, a cylindrical portion 91 into which the float valve spring 65 is inserted projects from the center of the lower surface of the upper wall 83. As shown in FIG. 6 (b), the cylindrical portion 91 and the peripheral wall 81 are connected by ribs 93 arranged radially at equal intervals, and a plurality of gaps 95 whose lower surface side is open are provided. It is defined inside the float valve 80. Further, as shown in FIGS. 1 and 6, circular punch holes 97 are formed on both sides of the upper wall 83 in the width direction of the concave portion 87 so as to communicate with the gap 95, respectively. Four punched holes 97 are provided. In this embodiment, the four gaps 95 have a structure penetrating in the axial direction by the punch hole 97, and the remaining four gaps 95 are closed on the upper surface and opened only on the lower surface. It should be noted that the hole 97 may be formed at a position communicating with the gap 95, and its position and number are not particularly limited.

  Then, the concave portions 87 and 87 of the float valve 80 are aligned with the main wall portion 50 and the sub wall portion 52 of the housing main body 30 to accommodate the float valve 80 in the valve chamber R1 of the housing main body 30, and its cylindrical portion 91. The float valve spring 65 is inserted into the inside. Further, the lower end of the float valve spring 65 is supported by the support protrusion 61b of the lower cap 60, and in this state, the outer periphery of the lower opening of the housing body 30 is covered with the peripheral wall 63 of the lower cap 60, The 30 engagement protrusions 43 are engaged with the engagement holes 63 a of the lower cap 60. As a result, the lower cap 60 is attached to the lower opening of the housing body 30, and the float valve 80 is accommodated in the valve chamber R1 so as to be movable up and down (see FIG. 2).

  As described above, when the float valve 80 accommodated in the valve chamber R1 is not immersed in fuel, the float valve spring 65 is compressed by its own weight and placed on the bottom wall 61 of the lower cap 60. Thus, the opening 35 of the housing body 30 is held in an open state (see FIGS. 2 and 7). When the fuel level in the fuel tank 1 rises and the float valve 80 is immersed to a predetermined height, the buoyancy of the float valve 80 itself is added to the urging force of the float valve spring 65, and the float valve 80 is As a result, the valve head 83a comes into contact with the valve seat 35a to close the opening 35 (see FIG. 8).

  Next, the effect of the valve apparatus of this invention is demonstrated.

  The valve device 10 in this embodiment is attached to the bracket 3 and attached to the inside of the fuel tank 1 by engaging the engagement piece 41a with the outer edge of the bracket 3 welded to the fuel tank 1 ( (See FIG. 2). In addition, a pipe connected to a canister (not shown) disposed outside the fuel tank 1 is connected to the connection pipe 39 so that the outside of the fuel tank 1 and the ventilation chamber R2 communicate with each other.

  When the vehicle does not shake, the fuel level in the fuel tank 1 does not tilt, and the float valve 80 is not immersed in the fuel, the float valve spring 65 is compressed by the weight of the float valve 80. The valve head 83a of the float valve 80 is separated from the valve seat 35a, and the opening 35 is open (see FIGS. 2 and 7).

  In the above state, when the vehicle turns or greatly tilts and the fuel level rises and the fuel is immersed in the float valve 80 by a predetermined height or more, buoyancy acts on the float valve 80 and the float valve spring 65 Due to this urging force, the float valve 80 is lifted, and as shown in FIG. 8, the valve head 83a comes into contact with the valve seat 35a and the opening 35 is closed. As a result, fuel can be prevented from flowing into the ventilation chamber R2 through the opening 35, and fuel leakage to the outside of the fuel tank 1 can be prevented. When the fuel level is lowered, the float valve 80 is lowered by its own weight, the valve head 83a is separated from the valve seat 35a, and the opening 35 is opened again.

  When the float valve 80 is moved up and down, the guide ribs 85 provided on the outer periphery of the float valve 80 are in sliding contact with the inner periphery of the peripheral wall 31 of the housing body 30 to guide the lift operation of the float valve 80. . In this embodiment, since the guide rib 85a is provided with a length that does not interfere with the main wall portion 50 and the sub wall portion 52, when the float valve 80 rises, the guide rib 85a comes into contact with the main wall portion 50 and the sub wall portion 52. This prevents the float valve 80 from moving up and down reliably, prevents backlash and inclination of the float valve 80, and seals the valve head 83a firmly against the valve seat 35a. Can be improved.

  In addition, since the float valve 80 is provided with the concave portion 87 into which the main wall portion 50 and the sub wall portion 52 enter when the float valve 80 is raised, it is possible to reliably prevent the main wall portion 50 and the sub wall portion 52 from interfering with each other. it can. Further, the degree of freedom such as the lengths H1, H2, L1, and L2 of the main wall portion 50 and the sub-wall portion 52 and the widths of the fuel flow paths F1 and F2 (see FIGS. 3 and 5B) is increased. Can do.

  Further, in this embodiment, a plurality of gaps 95 whose lower surfaces are opened are provided on the inner periphery of the float valve 80, and some of them are not in communication with the punch holes 97 (see FIG. 6B). These can be used as an air chamber for accumulating air, and the buoyancy acting on the float valve 80 can be increased when the fuel is immersed, which contributes to the stable operation of the float valve 80.

  By the way, when the float valve 80 immersed in the fuel rises, the fuel may accumulate on the upper surface of the upper wall 83 (see FIG. 8). After the fuel is accumulated on the upper surface of the upper wall 83 in this way, the valve head 83a of the float valve 80 contacts the valve seat 35a of the housing body 30 and the opening 35 is closed, and then the float valve 80 is lowered. Then, due to the difference between the internal pressure and the external pressure of the fuel tank 1, the fuel accumulated on the upper surface of the upper wall 83 may leak from the opening 35 to the ventilation chamber R <b> 2.

  On the other hand, in the present embodiment, because the upper wall 83 of the float valve 80 is formed with a vent hole 97 communicating with the gap 95, the fuel accumulated on the upper surface of the upper wall 83 is indicated by the arrow in FIG. As shown, the air can be discharged from below the float valve 80 through the air gap 95 from the hole 97. As a result, it is possible to effectively prevent the fuel accumulated on the upper surface of the upper wall 83 from leaking from the opening 35 to the ventilation chamber R2.

  When the vehicle travels on a rough road and vibrates up and down, swings left and right, or makes a sharp turn, the fuel droplets in the fuel tank 1 or the fine splash of fuel generated from the fuel level Largely oscillated fuel flows vigorously into the valve chamber R1 from the vent hole 45 (see FIG. 7).

  At this time, since the main wall portion 50 formed larger than the vent hole 45 is disposed at a position corresponding to the vent hole 45 on the inner periphery of the housing body 30, FIG. 4, FIG. 5B, and FIG. As shown in FIG. 7, the fuel that has flowed into the valve chamber R1 collides with the main wall 50, and the momentum thereof can be reduced, and the fuel leaks from the opening 35 of the housing body 30 to the vent chamber R2. Can be suppressed.

  Further, since the sub-wall portion 52 extends from the circumferential end portion of the main wall portion 50, the fuel is supplied to the vent hole 45 in the valve chamber R1 as indicated by an arrow Y1 in FIG. Even if the fuel flows obliquely vigorously, the fuel can collide with the sub-wall portion 52 to reduce the momentum, and fuel leakage from the opening 35 can be suppressed.

  The fuel that has flowed into the valve chamber R1 from the vent hole 45 flows in the valve chamber R1 through the fuel flow path F1 and the fuel flow path F2, as indicated by an arrow Y2 in FIG. . At this time, as shown in FIG. 5A, the axial length H2 of the sub-wall portion 52 is formed to be shorter than the axial length H1 of the main wall portion 50. The direction length can be shorter in the axial direction than the axial length of the fuel flow path F1 (see FIG. 3). Further, as shown in FIG. 5B, the circumferential length L2 of the sub-wall portion 52 is also shorter than the circumferential length L1 of the main wall portion 50, so that the circumferential direction of the fuel flow path F2 The length can be shorter in the circumferential direction than the circumferential length of the fuel flow path F1 (see FIG. 3).

  As described above, when the fuel that has flowed into the valve chamber R1 from the vent hole 45 collides with the main wall 50 and flows through the fuel flow path F1 and the fuel flow path F2, the axial length of the fuel flow path F2 is increased. Since the length of the fuel and the circumferential length are short, a part of the flow of the fuel is opened to a wide space there, so that the flow velocity of the fuel is reduced and the partition wall 33 is reduced there. Can be prevented from colliding with the opening 35 vigorously, and leakage from the opening 35 can be effectively prevented.

  Further, in this embodiment, main wall portions 50 are connected to both sides of the rib 48 projecting from the inner peripheral surface of the peripheral wall 31 of the housing body 30, and from the front end in the circumferential direction of each main wall portion 50. Since the sub-wall portions 52 are respectively extended, two sets of main wall portions 50, 50 and sub-wall portions 52, 52 can be provided via one rib 48. The installation space of the wall portion 52 can be reduced, and a large volume of the float valve 80 can be secured.

  Various valve devices equipped with float valves were set with a swing tester to test how much fuel leaked from the opening.

(Example)
A valve device 10 according to the present invention shown in FIGS. The main wall 50 has an axial length H1 of 5.2 mm, a circumferential length L1 of 5.3 mm, an auxiliary wall 52 has an axial length H2 of 3.4 mm, and a circumferential length L2 of The difference between the axial length H1 and the axial length H2 was 1.8 mm, and the difference between the circumferential length L1 and the circumferential length L2 was 2.5 mm. The vent hole 45 was circular and its inner diameter was 3.2 mm.

(Comparative Example 1)
Comparative Example 1 was manufactured with the same structure as in the above example except that the sub-wall portion 52 was not provided.

(Comparative Example 2)
Comparative Example 2 was manufactured with the same structure as the above example except that the axial length H2 of the sub-wall portion 52 was the same as the axial length H1 of the main wall portion 50.

(Test method)
An outline of the test method is shown in the plan view of FIG. First, the valve devices of the example and the comparative examples 1 and 2 are filled with a predetermined amount of water, and the distance between the lower surface of the valve device and the water surface is 50 mm in the container 5 to which a pressure of 3 kPa is applied. installed. The container 5 was set on a rocking tester 7.

  Here, as shown in FIG. 9 (a), the set of the swing direction of the swing tester 7 and the direction of the connecting pipe of the valve device is set (X direction set), as shown in FIG. 9 (b). In addition, the swing direction of the swing tester 7 and the connecting pipe of the valve device are set orthogonally (set in the Y direction), and as shown in FIG. The valve device was set so that the direction of the connection pipe with the connecting pipe was inclined by 45 ° (45 ° set).

  And after setting Example and Comparative Examples 1 and 2 to the swing tester 7 in the above-mentioned direction, the swing tester 7 was operated to swing the container 5. The amount of fuel leakage from the opening at that time was measured. For each of the valve devices of Examples and Comparative Examples 1 and 2, a plurality of these were performed in the X direction set, Y direction set, and 45 ° set, and the average was obtained. The results are summarized in Table 1 below.

  As shown in Table 1 above, in the valve device of the embodiment, the amount of fuel leakage from the opening is small in any direction of the X direction set, the Y direction set, and the 45 ° set, and the fuel leakage is effectively prevented. It was confirmed that it could be suppressed.

DESCRIPTION OF SYMBOLS 10 Valve apparatus 20 Housing 31 Perimeter wall 33 Partition wall 35 Opening part 35a Valve seat 45 Vent hole 48 Rib 50 Main wall part 52 Sub wall part 80 Float valve 83 Upper wall 85, 85a Guide rib 93 Rib 95 Cavity 97 Cavity 97

Claims (4)

A housing provided with a valve chamber communicating with the inside of the fuel tank at the lower side and a ventilation chamber communicating with the outside of the fuel tank at the upper side through a partition wall formed with an opening;
A float valve arranged to be movable up and down in the valve chamber of the housing,
A vent hole communicating with the valve chamber is formed below the partition wall of the peripheral wall of the housing,
A main wall portion is provided at a position corresponding to the vent hole on the inner circumference of the housing, wherein the length in the axial direction of the housing and the length in the circumferential direction are formed larger than the vent hole,
A sub-wall portion extends from the circumferential end of the main wall portion, and the length of the sub-wall portion along the axial direction of the housing is along the axial direction of the housing of the main wall portion. A valve device characterized by being formed shorter than the length.   The valve device according to claim 1, wherein ribs are provided so as to project from the inner surface of the peripheral wall of the housing, the main wall portions are connected to both sides of the ribs, and the sub-wall portions are connected to the tips of the main wall portions.   Inside the float valve, a plurality of voids surrounded by ribs and opened at the lower surface are formed, and a hole that communicates with some but not all of the voids is formed on the upper wall of the float valve. The valve device according to claim 1 or 2.   The guide rib is provided in the outer periphery of the said float valve in the axial direction of a float valve by the length which does not interfere with the said main wall part and the said sub-wall part at the time of the raising / lowering operation | movement. The valve device according to one.