JP5123837B2 - Float valve device - Google Patents

Description

  The present invention relates to a float valve device that is attached to a fuel tank of an automobile or the like and is suitable for a cut-off valve or the like.

  In the fuel tank of an automobile, fuel vapor is released to the canister, and when the automobile shakes greatly or the automobile falls over, the opening communicating with the canister is closed to prevent the fuel from leaking to the outside. A cut-off valve (also referred to as a rollover valve) is provided.

  As a conventional cut-off valve, for example, a float chamber communicating with the inside of the fuel tank is provided below through a partition wall, and a vent chamber communicating with the outside of the tank is provided on the upper side, and has a lower cap attached to the lower opening. A housing, a float valve disposed in the float chamber so as to be movable up and down, a valve formed on the partition so as to communicate the float chamber and the vent chamber, and a peripheral surface of a lower surface of the float valve contacting and separating the float valve The housing is provided with a communication port, and a side wall of the housing is formed with a through hole for communicating the float chamber and the fuel tank.

  However, in the cut-off valve described above, when the automobile turns or the fuel in the fuel tank is greatly shaken, the fuel enters the through-hole and splashes into the ventilation chamber side through the communication port. There was a case. Then, the fuel that has entered may be caused to flow toward the canister due to a pressure difference between the inside and outside of the tank, which may cause fuel leakage.

Various techniques have been proposed for suppressing the intrusion of fuel into the ventilation chamber, which causes such fuel leakage. For example, in Patent Document 1 below, a housing (case) that houses a float valve is provided, and when the oil level in the fuel tank rises above a predetermined level, the float valve rises to close the valve seat opening. In this way, the outflow of the raw fuel in the fuel tank is prevented, and a through hole (discharge hole) is formed in the vicinity of the upper end of the side wall of the housing. There is disclosed a cut-off valve in which a barrier (lateral wave defense wall) is provided with a gap, and the barrier extends to a position below the outer opening of the through hole.
Japanese Patent No. 333739

  The barrier in Patent Document 1 has an upper end connected to the upper part of the housing, a lower end is a free end, and an opening is formed between the inner periphery of the lower end of the barrier and the outer periphery of the side wall of the housing. In some cases, the fuel splash enters from the lower opening and enters the through hole, and enters the housing.

  Accordingly, an object of the present invention is to more effectively prevent fuel from entering through the through-hole of the housing side wall more effectively, and to prevent fuel splashing and the like from entering the vent chamber side through the communication port. To provide an apparatus.

  In order to achieve the above object, according to a first aspect of the present invention, a float chamber that communicates with the inside of the fuel tank is provided below the partition wall, and a vent chamber that communicates with the outside of the tank is provided on the upper side, and is attached to the lower opening. A housing having a lower cap, a float valve disposed in the float chamber so as to be movable up and down, and formed in the partition so as to communicate with the float chamber and the vent chamber. A through hole for communicating the float chamber with the inside of the fuel tank is formed in the side wall of the housing, and the lower cap is directed upward from the outer periphery thereof. And a barrier is formed outside the through hole with a predetermined gap between the side wall and the side wall of the housing. Provided is a float valve device in which a support piece for supporting a front end portion of a wall is formed, and a slit or a recess for fitting the front end portion of the barrier is formed on the support piece. It is.

  According to the above invention, when the fuel level in the fuel tank reaches a predetermined height or more, the fuel flows into the float chamber, the float valve rises due to buoyancy, and comes into contact with the valve seat formed in the partition wall. It is possible to prevent the fuel from flowing into the ventilation chamber through the communication port.

  Further, since the barrier is formed by providing a predetermined gap outside the through hole formed in the side wall of the housing, the vehicle swings or turns, so that the fuel in the fuel tank swings. Thus, even if it collides with the side wall, it can be prevented from directly colliding with the through hole due to the barrier, and fuel enters the float chamber vigorously from the through hole, and serves as fuel spray from the communication port provided in the partition wall. Can be prevented from entering the side.

  In addition, since the barrier extends upward from the outer periphery of the lower cap and is disposed outside the through hole, the lower part of the through hole is also covered with the barrier, so that the vehicle swings, turns, etc. Thus, even if the fuel swings and the fuel splash rises from below, it can be prevented from entering the through hole.

  In addition, since the support piece rises from above the through hole, the valve device is tilted as the vehicle is tilted, and the upper portion of the valve device approaches the fuel liquid level, or the fuel swings up and down greatly. In some cases, it is possible to prevent the fuel from entering from above the through hole.

  Moreover, since the front-end | tip part is supported by the support piece formed in the side wall of a housing, it can prevent that a barrier bends and is damaged.

  Furthermore, since the front end of the barrier is fitted into a slit or recess formed in the support piece, the barrier is prevented from falling inward or bent outward, and the barrier and the through hole It is possible to reliably hold the gap. For this reason, the inconvenience that the barrier falls to the side wall side of the housing and blocks the through hole in the housing side wall can be avoided.

  According to a second aspect of the present invention, a float chamber communicating with the inside of the fuel tank below the partition wall, a ventilation chamber communicating with the outside of the tank above the housing, and a lower cap attached to the lower opening, A float valve disposed in the float chamber so as to be movable up and down, and the partition wall are formed so as to communicate the float chamber and the vent chamber, and a peripheral surface of the lower surface forms a valve seat for contacting and separating the float valve. A through hole for communicating the float chamber and the inside of the fuel tank is formed in the side wall of the housing, and the lower cap extends upward from an outer periphery thereof, and the side wall A barrier is disposed outside the through hole with a predetermined gap therebetween, and the side wall of the housing rises from above the through hole and supports the tip of the barrier. A piece is formed, and the support piece protrudes from the side wall of the housing in the shape of an eave, and its tip is bent downward to maintain a predetermined gap between the side wall and the outside of the through hole. The float valve apparatus is characterized in that a cover wall extending so as to cover the cover wall, one side of the cover wall is connected to the side wall, and the other side is open.

  According to the above invention, the rigidity of the barrier is enhanced by the portion protruding in an eave shape, the cover wall extending so as to cover the outside of the through hole, and the connecting wall covering one side of the cover wall. While ensuring the space | gap between a side wall and a barrier, it can prevent more effectively that a fuel penetrates from a through-hole vigorously.

  Further, since one side of the cover wall is connected by the connecting wall, the rigidity can be improved, and the tip of the barrier can be firmly supported. Further, since the other side of the cover wall is open, air and fuel can easily pass through the through hole.

  According to a third aspect of the present invention, in the second aspect of the present invention, ribs are provided on both sides of the barrier so as to cover a gap between the barrier and the side wall of the housing. A float valve device is provided.

According to the above invention, since the ribs are provided on both sides of the barrier so as to cover the gap between the barrier and the side wall of the housing, the fuel splash or the like hardly enters the through hole from both sides of the barrier.
According to a fourth aspect of the present invention, there is provided a housing having a lower cap that is provided in a lower opening and is provided with a float chamber communicating with the inside of the fuel tank below the partition wall and a ventilation chamber communicating with the outside of the tank above. A float valve disposed in the float chamber so as to be movable up and down, and the partition wall are formed so as to communicate the float chamber and the vent chamber, and a peripheral surface of the lower surface forms a valve seat for contacting and separating the float valve. A through hole for communicating the float chamber and the inside of the fuel tank is formed in the side wall of the housing, and the lower cap extends upward from an outer periphery thereof, and the side wall A barrier is disposed outside the through hole with a predetermined gap therebetween, and the side wall of the housing rises from above the through hole and supports the tip of the barrier. In the outer periphery of the side wall of the housing, a recess is formed at a predetermined depth in the inner diameter direction of the housing, and the through hole is formed in the recess. A float valve device is provided.
According to the above invention, since the formation position of the through hole can be shifted toward the inner diameter side of the housing, the barrier can be formed closer to the inner diameter of the housing while maintaining the gap between the barrier and the through hole. Can be made compact. Moreover, since the through-hole is formed in a hollow portion that is recessed at a predetermined depth, it is possible to make it more difficult for fuel splash and fuel to enter the through-hole.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the base end portion of the barrier is in close contact with the lower outer periphery of the side wall of the housing, and is outside the through hole of the barrier. The located portion provides a float valve device having a predetermined gap with respect to the side wall of the housing.

  According to the above invention, since the base end portion of the barrier is in close contact with the lower outer periphery of the side wall of the housing, the lower cap can be attached to the housing without backlash and is located outside the through hole. In the portion, by having a predetermined gap with respect to the side wall, it is possible to ensure the entry and exit of fuel and air through the through hole.

  According to the present invention, a barrier is formed outside the through hole in the side wall of the housing, and the lower part of the through hole is also covered with the barrier, so even if the fuel swings and splashes from below, Entering the through hole can be prevented. Moreover, since the front-end | tip part of a barrier is supported by the support piece, the bending of a barrier can be prevented.

  Hereinafter, an embodiment in which the float valve device of the present invention is applied to a cutoff valve will be described with reference to FIGS.

  As shown in FIG. 1, the float valve device 1 (hereinafter referred to as “valve device 1”) includes a housing main body 10, a lower cap 30 that is attached to a lower opening of the housing main body 10, and a housing main body 10. The housing 5 includes an upper cap 40 mounted on the upper side.

  As shown in FIGS. 4 and 5, the internal space defined by the housing body 10 and the lower cap 30 forms a float chamber R1 in which a float valve 50, which will be described later, can be moved up and down, and the housing body 10 and the upper cap. The internal space defined by 40 forms a ventilation chamber R2. The float chamber R1 communicates with the inside of the fuel tank, and the vent chamber R2 communicates with a flow path that reaches a canister disposed outside the fuel tank. Hereinafter, each component will be described.

  As shown in FIGS. 1, 4, and 5, the housing body 10 includes a cylindrical side wall 11 having an opening at the bottom, and a partition wall 12 that closes the upper surface thereof. A communication port 13 is formed at the center of the partition wall 12. The float chamber R1 and the ventilation chamber R2 communicate with each other. The peripheral edge of the lower surface of the communication port 13 protrudes in a cylindrical shape at a predetermined height, and forms a valve seat 13a to which a valve head 51 of a float valve 50 described later contacts and separates.

  A box-shaped valve body accommodating portion 15 is provided at one location on the outer periphery of the housing body 10. In the bottom wall of the valve body housing portion 15, an opening 15a to which the ball valve V contacts and separates is formed (see FIG. 4). A ball valve V is accommodated in the valve body accommodating portion 15, a first urging spring S1 is accommodated, the ball valve V is urged toward the opening portion 15a, and the opening portion 15a is always closed. . In addition, a connecting pipe 16 for connecting a pipe connected to a canister (not shown) is integrally formed in the valve body housing portion 15 so as to communicate with the internal space of the valve body housing portion 15. The ball valve V is separated from the opening 15a against the urging force of the first urging spring S1 when the pressure in the fuel tank rises to a predetermined value or more, and the fuel vapor is discharged out of the fuel tank. It is designed to fulfill the function of discharging.

  A frame-shaped cap mounting portion 17 is projected from the upper surface of the partition wall 12 of the housing body 10 and above the valve body housing portion 15. An upper cap 40 is attached to the upper opening of the cap mounting portion 17. Further, a bracket engaging piece 18 is extended from the opposite side of the cap mounting portion 17 to the connecting pipe 16, and an engaging claw 18a protruding from the lower end of the tip of the bracket B shown in FIG. The valve device 1 is attached to the fuel tank T via the bracket B by engaging with the outer edge.

  In addition, a plurality of engaging protrusions 19 are provided below the side wall 11 of the housing body 10 so as to engage with engaging holes 37a (described later) of the lower cap 30 along the circumferential direction.

  As shown in FIGS. 2 and 5 to 7, the side wall 11 of the housing main body 10 is formed with a through hole 20 that allows the float chamber R <b> 1 to communicate with the inside of the fuel tank. In this embodiment, a plurality of circular through holes 20 are formed at two positions facing the circumferential direction of the cylindrical side wall 11 and perpendicular to the connecting pipe 16 and the bracket engaging piece 18. Has been.

  As shown in FIG. 2, the through-holes 20 are formed in two opposite sides of the side wall 11 so as to be lined up and down in two rows, the uppermost through-holes 20 a and 20 a and below the through-holes 20 a and 20 a. The through-holes 20b are arranged, and a total of six are provided in each of the two opposing positions of the side wall 11.

  A support piece 25 that supports a barrier 35 of a lower cap 30 described later is formed on the side wall 11 of the housing body 10. As shown in FIG. 2, the support piece 25 has an eave-like projecting piece 26 projecting in an eave-like shape from the outer peripheral surface above the upper through hole 20 a of the side wall 11. The tip of the piece 26 is bent downward, and has a cover wall 27 extending so as to cover the upper through-hole 20a while maintaining a predetermined gap with the side wall 11.

  The eaves-like projecting piece 26 of this embodiment has a width along the circumferential direction of the side wall 11 that covers the pair of left and right upper through holes 20a, 20a, and hangs from the outer peripheral surface of the side wall 11 toward the outer diameter direction. It is installed. Further, the cover wall 27 has the same width as the eaves-like projecting piece 26, is bent perpendicularly to the eaves-like projecting piece 26, extends downward, and has a constant width between the cover wall 27 and the side wall 11. The gap is formed.

  Further, as shown in FIG. 1, the eaves-like projecting piece 26 is formed with a slit 26 a penetrating therethrough along the width direction thereof. The slit 26a may be a recess formed at a predetermined depth from the lower surface of the eaves-like projecting piece 26, as long as the tip of the barrier 35 can be fitted. Further, the cover wall 27 has one side 27a connected to the side wall 11 and closed, and the other side 27b opened without being connected to the side wall 11 (see FIGS. 2 and 7). The cover wall 27 is formed with a pair of holes 27c and 27c at positions aligned with the pair of upper through holes 20a and 20a provided in the side wall 11.

  The front end of the barrier 35 is adapted to fit into a slit 26a formed in the eaves-like protrusion 26 (see FIGS. 5 and 6). In this connection, the gap between the barrier 35 and the side wall 11 of the housing body 10 is covered on both sides of the barrier 35 along the circumferential direction of the side wall 11 below the cover wall 27 of the side wall 11. Ribs 28 and 28 are erected. In this embodiment, the ribs 28 and 28 are formed at a height that covers two sets of lower through-holes 20b that are disposed at a predetermined distance from both sides in the width direction of the barrier 35 and that are vertically arranged in pairs. .

  The lower cap 30 attached to the lower opening of the housing body 10 having the above structure has a circular bottom plate 31 formed with a through hole 31a through which fuel can pass. From the side, a spring support projection 33 is provided to support one end of the second urging spring S2.

  The bottom plate 31 is formed with a barrier 35 that extends upward from the outer peripheral edge thereof and is disposed outside the plurality of through holes 20 with a predetermined gap between the bottom plate 31 and the side wall 11. Yes. In this embodiment, a pair of barriers 35, 35 extend upward from a position in the circumferential direction of the outer peripheral edge of the bottom plate 31.

  Each of the barriers 35 extends upward from a base end portion 35a that is in close contact with the lower outer periphery of the side wall 11 of the housing body 10 and an upper end outer periphery of the base end portion 35a while securing a predetermined gap between the side wall 11 and And an extending portion 35b forming a portion located outside the through hole 20. The extending portion 35 b extends upward in parallel with the axis of the housing body 10, and maintains a certain gap with the side wall 11. The distal end portion of the extending portion 35b is fitted into the slit 26a of the support piece 25 so that the barrier 35 is supported.

  Further, an engagement hole 37 a that covers the outer periphery of the bottom plate 31 and covers the lower outer periphery of the side wall 11 of the housing body 10 and engages with the engagement protrusion 19 from between the pair of barriers 35, 35. A plurality of engaging walls 37 are provided upright.

  The float valve 50 slidably accommodated in the float chamber R1 has a substantially cylindrical shape, and a valve head 51 that contacts and separates from the valve seat 13a protrudes from the center of the upper surface thereof, and extends vertically on the outer periphery thereof. A plurality of guide ribs 52 are formed, which are in sliding contact with the inner periphery of the side wall 11 of the housing body 10 to guide the slide operation of the float valve 50.

  The float valve 50 is disposed in the float chamber R1 as follows. That is, the float valve 50 is inserted into the float chamber R <b> 1 of the housing body 10 with the second biasing spring S <b> 2 inserted into the recess 53 provided at the bottom center of the float valve 50.

  Next, one end of the second urging spring S <b> 2 is supported by the spring support protrusion 33, and the lower cap 30 is pushed toward the lower opening of the housing body 10. Then, the engaging wall 37 is placed on the lower outer periphery of the side wall 11 of the housing body 10 and the base end portion 35a of the barrier 35 is brought into close contact, and the engaging protrusion 19 of the housing body 10 is engaged with the engaging hole 37a of the lower cap 30. Further, the tip of the barrier 35 is fitted into the slit 26a of the eaves-like protrusion 26 (see FIGS. 5 and 6). As a result, the barrier 35 is disposed in a state where a predetermined gap is provided outside the side wall 11, and the extending portion 35 b covers the outside of the plurality of through holes 20 a and 20 b and is in close contact with the outer periphery of the side wall 11. The lower cap 30 is attached to the lower opening of the housing body 10 with the base end portion 35a covering the lower portion of the through-hole 20 (see FIGS. 2, 5, and 6).

  As described above, since the base end portion 35a of the barrier 35 in this embodiment is in close contact with the lower outer periphery of the side wall 11 of the housing body 10, the lower cap 30 is attached to the housing body 10 without backlash. Can do.

  Moreover, since the front-end | tip part of the barrier 35 fits in the slit 26a formed in the support piece 25, the fall of the inner side of the barrier 35 (direction approaching the side wall 11 of the housing main body 10), It is possible to reliably prevent the outward bending (the direction away from the side wall 11 of the housing body 10), and to reliably hold the gap between the barrier 35 and the through hole 20.

  Furthermore, since one side of the cover wall 27 that constitutes the support piece 25 that supports the tip of the barrier 35 is connected to the side wall 11 of the housing body 10 (see FIGS. 2 and 7), the rigidity of the support piece 25. The tip of the barrier 35 can be firmly supported.

  Further, the base 35a of the barrier 35 is supported in close contact with the outer periphery of the lower portion of the side wall 11 of the housing body 10, and the tip is supported by the support piece 25, so that both ends thereof are supported. Therefore, it is possible to reliably prevent deformation, bending, etc. of the barrier 35 from bending outward, falling inward, etc., and to secure a gap between the barrier 35 and the through-hole 20 firmly. Can do.

  As described above, when the lower cap 30 is attached to the housing body 10, the float valve 50 is slidably accommodated in the float chamber R <b> 1, and at the same time, between the float valve 50 and the bottom plate 31 of the lower cap 30. A second biasing spring S2 is interposed therebetween. When the float valve 50 is not immersed in fuel, the float valve 50 is placed on the bottom plate 31 by compressing the second urging spring S2 by its own weight. Further, the second urging spring S2 provides an upward urging force to the float valve 50 together with the buoyancy generated in the float valve 50 when the fuel rises due to the inclination of the vehicle and the float valve 50 is immersed in the fuel. give.

  Next, the function and effect of the valve device 1 will be described.

  The valve device 1 is attached to the bracket B by engaging the engaging claw 18a of the bracket engaging piece 18 with the outer edge of the bracket B welded to the fuel tank T, and the valve device 1 is installed inside the fuel tank T. The apparatus 1 can be attached. Further, a pipe connected to a canister (not shown) disposed outside the fuel tank T is connected to the connection pipe 16 of the valve device 1.

  When the vehicle does not shake, the liquid level of the fuel in the fuel tank does not tilt, and the float valve 50 is not immersed in the fuel, the second urging spring S2 is compressed by the weight of the float valve 50, The valve head 51 of the float valve 50 is separated from the valve seat 13a, and the communication port 13 is open (see FIGS. 4 and 5).

  In the above state, when the vehicle turns or greatly tilts, the liquid level of the fuel F rises, and when the fuel is immersed in the float valve 50 by a predetermined height or more, buoyancy acts on the float valve 50 and the second attachment The float valve 50 is lifted by the urging force of the urging spring S2, and as shown in FIG. 6, the valve head 51 contacts the valve seat 13a and the communication port 13 is closed. As a result, the fuel is prevented from flowing into the ventilation chamber R2 through the communication port 13, and fuel leakage to the outside of the fuel tank T can be reliably prevented.

  Further, when the vehicle travels on a rough road and vibrates up and down, swings left and right, or turns sharply, the fuel F in the fuel tank T swings, as shown in FIG. As described above, there are cases where the fine droplet-like fuel splashes Fa rise from the fuel liquid surface and collide with the side wall 11 of the housing body 10.

  On the other hand, in this valve device 1, a barrier 35 is formed outside the plurality of through holes 20 a, 20 b formed in the side wall 11 of the housing body 10 with a predetermined gap therebetween. As shown in FIG. 4, even if the oscillating fuel F or fuel splash Fa collides with the side wall 11 of the housing body 10, it can be prevented that they collide directly with the plurality of through holes 20a and 20b. As a result, it is possible to prevent fuel from entering the float chamber R1 vigorously from the plurality of through holes 20a and 20b and entering the vent chamber R2 side from the communication port 13 provided in the partition wall 12.

  In addition, as described above, the barrier 35 extends upward from the outer periphery of the lower cap 30 mounted below the housing body 10 and is disposed outside the plurality of through holes 20a and 20b. Since the lower part of the plurality of through holes 20a and 20b is also covered with the barrier 35, even if the fuel F swings and the fuel splash Fa rises from below due to the swinging or turning of the vehicle, the plurality of through holes It is possible to prevent the holes 20a and 20b from entering.

  Further, in this embodiment, the eaves-like protrusion 26 rises from above the upper through hole 20a and covers the upper through hole 20a, so that the fuel F largely fluctuates up and down as the vehicle tilts. Thus, even if the fuel starts to fall from above the eaves-like projecting piece 26, it is possible to prevent the fuel F from entering the through holes 20a and 20b directly.

  Moreover, since the front-end | tip part of the barrier 35 is supported by the support piece 25 formed in the side wall 11 of the housing main body 10, it can prevent that the barrier 35 bends outward. As a result, the breakage of the barrier 35 can be suppressed and the through hole 20 can be prevented from being exposed, and the fuel splash Fa and the like from the through hole 20 can be prevented from entering. Furthermore, since the barrier 35 can be prevented from falling inward, a gap between the barrier 35 and the side wall 11 of the housing body 10 can be secured and the through hole 20 can be held open. As a result, the through hole 20 can be held in an open state, and as shown by an arrow in FIG. 7, the through hole 20 is discharged from the liquid fuel F flowing into the float chamber R1, fuel vapor, It can function reliably as an air inlet / outlet port.

  Further, the support piece 25 of this embodiment is configured such that the fuel F and the fuel splash Fa are passed from the through hole 20 into the float chamber R <b> 1 of the housing body 10 by the eaves-like protrusion 26 and the cover wall 27 that covers the outside of the through hole 20. Can be prevented from entering. Further, the cover wall 27 has one side 27a connected to the side wall 11 of the housing body 10, but the other side 27b is open. Therefore, as shown in FIG. In addition, fuel, fuel vapor, or air can be easily passed through the through hole 20.

  Furthermore, in this embodiment, ribs 28 and 28 are erected on both sides of the side wall 11 of the housing body 10 below the cover wall 27 and in the width direction of the barrier 35. Since the gap with the side wall 11 of the main body 10 is covered, it is possible to make it difficult for the fuel F and the fuel splash Fa to enter the through hole 20 from both sides of the barrier 35.

  By the way, the pressure in the fuel tank T may still increase in a state where the liquid level of the fuel F rises and the communication port 13 is closed by the float valve 50. In this case, the ball valve V that normally closes the opening 15a of the valve body accommodating portion 15 slides upward against the urging force of the first urging spring S1 to open the opening 15a, and the fuel vapor is supplied to the fuel tank. Since it is discharged outside, the pressure in the fuel tank is maintained at a predetermined value.

  Further, the valve device 1 having the above structure may be disposed in a fuel tank in combination with a full tank regulating valve. That is, in addition to the valve device 1 functioning as a cut-off valve, a full tank regulating valve is disposed in the fuel tank. When the fuel level reaches a certain level during refueling, the full tank regulating valve closes and is not shown. The fuel is returned to a predetermined portion of the fuel supply pipe through the vent tube, and the supply of fuel is stopped.

  Then, the height of the liquid level at which the valve device 1 (cut-off valve) is closed is set to be higher by a predetermined distance than the level of the liquid level at which the full tank control valve is closed. In addition, the valve device 1 (cut-off valve) is prevented from being closed. That is, until the full tank regulating valve is closed and the refueling is stopped, the fuel vapor or air can be discharged through the float chamber R1 of the housing 5, that is, the through hole 20 is maintained open. It will be necessary.

  In response to such a request, in the valve device 1 according to the present invention, as described above, the gap between the barrier 35 and the side wall 11 of the housing 5 is secured and the through hole 20 is held open. Can do.

  8 and 9 show another embodiment of the float valve device of the present invention. It should be noted 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 float valve device 1 a (hereinafter referred to as “valve device 1 a”) of this embodiment includes a hollow portion that is recessed at a predetermined depth in the inner diameter direction of the housing body 10 on the outer periphery of the side wall 11 of the housing body 10 that constitutes the housing 5. 11a is formed, and the through hole 20 is formed at the bottom of the recess 11a. Corresponding to the depression 11a, the position of the depression 11a on the inner periphery of the side wall 11 of the housing body 10 has a shape protruding at a predetermined height in the inner diameter direction.

  According to the above embodiment, the formation position of the through hole 20 can be shifted to the inner diameter side of the housing body 5 as compared with the above embodiment, so that the barrier between the barrier 35 and the through hole 20 is maintained while the barrier is maintained. The extending portion 35b of the 35 can be formed closer to the inner diameter of the housing body 5, and as a result, the barrier 35 can be made compact. Moreover, since the through-hole 20 is formed in the bottom part of the hollow part 11a dented by the predetermined depth, it can make fuel splash Fa and fuel into a through-hole 20 still more difficult.

It is a disassembled perspective view which shows one Embodiment of the float valve apparatus of this invention. It is a principal part expansion perspective view of the float valve apparatus. It is an expansion perspective view of the lower cap which comprises the same float valve apparatus. It is sectional drawing of the same float valve apparatus. It is sectional drawing in the cut surface orthogonal to FIG. 4 of the float valve apparatus. FIG. 6 is a cross-sectional view showing a state in which the float valve is raised to the maximum extent on the same cut surface as in FIG. 5 of the float valve device. It is sectional drawing in the VII-VII arrow line of FIG. It is sectional drawing which shows other embodiment of the float valve apparatus of this invention. It is a principal part expansion perspective view of the float valve apparatus.

Explanation of symbols

1,1a Float valve device (valve device)
5 Housing 10 Housing Body 11 Side Wall 12 Bulkhead 13 Communication Port 13a Valve Seat 20 Through Hole 25 Supporting Piece 26 Eaves-like Projection 26a Slit 27 Cover Wall 28 Rib 30 Lower Cap 35 Barrier 35a Base End 40 Upper Cap 50 Float Valve R1 Float Room R2 Ventilation room

Claims (5)

A housing having a lower cap attached to a lower opening, a float chamber communicating with the inside of the fuel tank below the partition wall, and a ventilation chamber communicating with the outside of the tank above the tank;
A float valve disposed in the float chamber so as to be movable up and down;
The partition wall is formed to communicate with the float chamber and the vent chamber, and a lower surface periphery thereof includes a communication port that forms a valve seat with which the float valve contacts and separates,
A through hole for communicating the float chamber and the fuel tank is formed in the side wall of the housing.
In the lower cap, a barrier is formed that extends upward from the outer periphery thereof and is disposed outside the through hole with a predetermined gap between the lower cap and the lower cap.
On the side wall of the housing, a support piece that rises from above the through hole and supports the tip of the barrier is formed,
A float valve device, wherein the support piece is formed with a slit or a recess into which the tip of the barrier is fitted. A housing having a lower cap attached to a lower opening, a float chamber communicating with the inside of the fuel tank below the partition wall, and a ventilation chamber communicating with the outside of the tank above the tank;
A float valve disposed in the float chamber so as to be movable up and down;
The partition wall is formed to communicate with the float chamber and the vent chamber, and a lower surface periphery thereof includes a communication port that forms a valve seat with which the float valve contacts and separates,
A through hole for communicating the float chamber and the fuel tank is formed in the side wall of the housing.
In the lower cap, a barrier is formed that extends upward from the outer periphery thereof and is disposed outside the through hole with a predetermined gap between the lower cap and the lower cap.
On the side wall of the housing, a support piece that rises from above the through hole and supports the tip of the barrier is formed,
The support piece protrudes in an eaves shape from the side wall of the housing, and its tip is bent downward so as to extend outside the through hole while maintaining a predetermined gap between the support piece and the side wall. A float valve device, wherein one side of the cover wall is connected to the side wall and the other side is open.   The float valve device according to claim 2, wherein ribs are provided on both sides of the barrier so as to cover a gap between the barrier and the side wall of the housing. A housing having a lower cap attached to a lower opening, a float chamber communicating with the inside of the fuel tank below the partition wall, and a ventilation chamber communicating with the outside of the tank above the tank;
A float valve disposed in the float chamber so as to be movable up and down;
The partition wall is formed to communicate with the float chamber and the vent chamber, and a lower surface periphery thereof includes a communication port that forms a valve seat with which the float valve contacts and separates,
A through hole for communicating the float chamber and the fuel tank is formed in the side wall of the housing.
In the lower cap, a barrier is formed that extends upward from the outer periphery thereof and is disposed outside the through hole with a predetermined gap between the lower cap and the lower cap.
On the side wall of the housing, a support piece that rises from above the through hole and supports the tip of the barrier is formed,
2. A float valve device according to claim 1, wherein a recess is formed at a predetermined depth in the inner diameter direction of the housing on the outer periphery of the side wall of the housing, and the through hole is formed in the recess.   A base end portion of the barrier is in close contact with a lower outer periphery of a side wall of the housing, and a portion of the barrier located outside the through hole has a predetermined gap with respect to the side wall of the housing. Item 5. The float valve device according to any one of Items 1 to 4.