JP2023088727A - valve device - Google Patents

Abstract

To provide a valve device capable of making a float valve hard to float if a flow rate of a fluid in a fuel tank is a predetermined value or less.SOLUTION: A valve device 10 has a housing 15 and a float valve 80, and the housing 15 has a peripheral wall 41 and a bottom wall 43 disposed under the peripheral wall. On the bottom wall 43, while the float valve 80 is supported, an inflow suppression wall 67 is provided, which is formed so as to project upward from a bottom surface 81a of the float valve 80 on the outer side than the outer periphery of the float valve 80. The inflow suppression wall 67 is disposed so as to overlap with a peripheral wall side communication hole 53 when viewing the housing 15 from the diametrical direction, or the inflow suppression wall 67 projects obliquely outward toward the upper side.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a valve device attached to a fuel tank of an automobile or the like and used as a fuel outflow prevention valve, a full tank control valve, or the like.

For example, in the fuel tank of a vehicle such as a car, when the car tilts or rolls over,
A valve device (cut valve) that prevents the fuel in the fuel tank from leaking out of the fuel tank,
A valve device (overfill prevention valve) is installed to prevent overfilling of the fuel tank so that the liquid level in the fuel tank does not rise above a preset full tank level. Such a valve device generally has a housing with a vent chamber at the top and a valve chamber at the bottom via a partition wall having an opening, and a float valve arranged in the valve chamber so as to move up and down. .

For example, Patent Literature 1 below describes a fuel tank valve device that includes a case that has a vent valve port communicating with the outside of the tank and a fuel inflow portion, and a float body that is vertically arranged in the case. . The case is composed of a cylindrical upper body and a similarly cylindrical lower body. A partition wall is formed on the lower end side of the lower body, and a through hole is formed in the partition wall. Further, a recess is formed at the lower end of the lower body at a location aligned with the through hole. This recess communicates with the internal space of the lower body via the through hole.

International publication WO2013/141220

By the way, for example, when fuel is supplied into the fuel tank, fluid such as air or fuel vapor in the fuel tank blows up and flows into the valve chamber. may float. At this time, if the float valve immediately floats up and blocks the opening when refueling, the float valve will not function as a cut valve or an overfilling prevention valve. is a predetermined value or less, it is set so as not to float.

However, in the case of the fuel tank device of Patent Document 1, the recess formed in the lower end of the lower body communicates with the internal space of the lower body through the through hole, so that when refueling, etc., the fuel enters from the recess through the recess. Since the fluid that has flowed into the lower body through the through-hole hits the bottom surface of the float body, there is a problem that the float body tends to float up.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a valve device that makes it difficult for a float valve to rise when the flow rate of fluid in a fuel tank is less than a predetermined value.

In order to achieve the above object, one of the valve devices according to the present invention is provided with a valve chamber downwardly communicating with the inside of the fuel tank and a vent chamber upwardly communicating with the outside of the fuel tank through a partition wall. a housing in which an opening communicating between the valve chamber and the ventilation chamber is formed in a partition wall; The housing has a peripheral wall formed with a peripheral-wall-side communication hole communicating between the inside of the fuel tank and the inside of the valve chamber, and a bottom wall arranged below the peripheral wall. An inflow control wall is provided outside an outer periphery of the float valve and protruding upward from a bottom surface of the float valve in a state in which the float valve is supported, the inflow control wall comprising: It is characterized in that it is arranged so as to overlap with the peripheral wall side communication hole when the housing is viewed from the radial direction.

Another valve device according to the present invention is provided with a valve chamber downwardly communicating with the inside of the fuel tank and a ventilation chamber upwardly communicating with the outside of the fuel tank through a partition wall. and a float valve that is housed in the valve chamber so as to be able to move up and down and closes the opening, wherein the housing is connected to the fuel tank and a bottom wall disposed below the peripheral wall. The bottom wall supports the float valve. an inflow suppressing wall formed to protrude upward from the bottom surface of the float valve outside the outer circumference of the float valve, and the inflow suppressing wall is obliquely outwardly directed upward. It is characterized by protruding in the direction of

In yet another valve device according to the present invention, a valve chamber downwardly communicating with the inside of the fuel tank and an air vent chamber upwardly communicating with the outside of the fuel tank are provided through a partition wall, and the partition wall is provided with the valve chamber. and a float valve housed in the valve chamber so as to be movable up and down and closing the opening, wherein the housing includes a peripheral wall and a float valve. and a bottom wall arranged below the peripheral wall, and the bottom wall, in a state in which the float valve is supported, extends outside the outer circumference of the float valve and from the bottom surface of the float valve. an inflow suppression wall is provided so as to protrude upward, and the bottom wall is formed with a bottom wall side communication hole for communicating the inside of the fuel tank and the valve chamber with each other, The inflow suppression wall is provided from the inner peripheral edge of the bottom wall side communication hole.

According to one aspect of the present invention, the fluid that has flowed into the valve chamber through the communication hole on the peripheral wall collides with the inflow suppressing wall, so that it is possible to make it difficult for the fluid to flow into the bottom surface of the float valve. When the fluid blows up, pushing up by the fluid from the bottom side of the float valve is suppressed, and the float valve can be made less likely to float.

According to another aspect of the present invention, the fluid that has flowed into the valve chamber collides with the inflow suppression wall and can change its flow direction outward in the radial direction of the housing. As a result, when the fluid blows up at the time of refueling, etc., the fluid push-up from the bottom side of the float valve is suppressed, so the float valve is lifted up. can be made difficult.

According to still another aspect of the present invention, since the fluid flowing into the valve chamber from the bottom wall side communication hole collides with the inflow suppression wall, it is possible to make it difficult for the fluid to flow into the bottom side of the float valve. For example, when the fluid blows up, it is possible to prevent the float valve from being pushed up by the fluid from the bottom side of the float valve.

1 is an exploded perspective view showing one embodiment of a valve device according to the present invention; FIG. It is a perspective view of the same valve apparatus. It is a side view of the same valve apparatus. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; It is an expansion perspective view of the housing main body which comprises the housing of the same valve apparatus. FIG. 4 is an enlarged perspective view of a lower cap that constitutes the housing of the valve device; 7 is an enlarged perspective view of the lower cap that constitutes the housing of the valve device, viewed from a direction different from that of FIG. 6. FIG. FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2; FIG. 2 is an enlarged cross-sectional perspective view of a main part of the same valve device; It is a cross-sectional enlarged view of the valve apparatus which does not have an inflow control wall.

(One embodiment of the valve device)
An embodiment of a valve device according to the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, the valve device 10 of this embodiment is provided with a valve chamber V downwardly communicating with the inside of the fuel tank and a vent chamber R upwardly communicating with the outside of the fuel tank through a partition wall 23. a housing 15 having a partition wall 23 formed with an opening 25 communicating between the valve chamber V and the ventilation chamber R; and an urging spring S that urges the float valve 80 .

Also, the housing 15 of this embodiment has a housing body 20 , a lower cap 40 attached below the housing body 20 , and an upper cover 70 attached above the housing body 20 .

In the following description, "fuel" means liquid fuel (including droplets of fuel), and "fuel vapor" means vaporized fuel.

First, the housing body 20 will be described with reference to FIGS. 1, 4, 5, and the like.

The housing body 20 has a substantially cylindrical peripheral wall 21, and a substantially disc-shaped partition wall 23 is disposed above the peripheral wall 21. As shown in FIG. An opening 25 is formed in the center of the partition wall 23 in the radial direction. A plurality of ribs 25a are formed inside the opening 25, and these ribs 25a make the opening 25 have a lattice hole shape. Furthermore, a flange portion 26 protrudes from the upper outer periphery of the peripheral wall 21 . A ring mounting groove 27a is formed inside the flange portion 26, and an annular seal ring 27 is mounted in the ring mounting groove 27a (see FIG. 4).

Further, as shown in FIGS. 1 and 5, a plurality of cap-side engaging protrusions 29 protrude from the outer periphery of the peripheral wall 21 at positions near the lower end 21a. Furthermore, a plurality of cover-side engaging projections 31 are projected at positions aligned with the cap-side engaging projections 29 on the outer circumference of the peripheral wall 21 .

Further, as shown in FIG. 1, a pair of positioning protrusions 33, 33 are provided on the outer periphery of the peripheral wall 21 at positions substantially aligned in the axial direction with respect to the cover-side engagement protrusion 31. ing.

Also, as shown in FIGS. 1 and 3, communication holes 35 are formed in two radially opposite locations on the upper end side of the peripheral wall 21 to allow the inside of the fuel tank and the inside of the valve chamber V to communicate with each other. It is Except when the vehicle rolls over or is turned upside down, the communication hole 35 is always maintained in a non-immersed state, and serves as a portion through which the air in the fuel tank flows into the valve chamber V. As shown in FIG.

Further, as shown in FIG. 5, guide ribs 37 extending in the axial direction are provided on the inner circumference of the peripheral wall 21 at equal intervals in the circumferential direction. These guide ribs 37 guide the up-and-down motion of the float valve 80 .

Next, the lower cap 40 attached below the housing body 20 will be described with reference to FIGS.

The lower cap 40 has a bottomed cap shape having a substantially cylindrical peripheral wall 41 and a bottom wall 43 arranged on the bottom side, which is axially below the peripheral wall 41 .

As shown in FIG. 4, an outer peripheral wall 45 extending axially upward is provided outside the upper end of the peripheral wall 41, forming a double cylindrical wall. An annular groove 47 is provided between the outer peripheral wall 45 and the upper end portion of the peripheral wall 41 . The axial lower end portion 21 a of the peripheral wall 21 of the housing body 20 is inserted into the annular groove 47 .

Further, as shown in FIG. 1, a plurality of elongated engagement holes 49 are formed in the upper end portion of the outer peripheral wall 45 at equal intervals in the circumferential direction. Then, as shown in FIG. 2, by engaging the corresponding cap-side engaging protrusions 29 of the housing main body 20 with the respective engaging holes 49 of the lower cap 40, the lower part of the housing main body 20 is lowered. A cap 40 is attached. As a result, a valve chamber V communicating with a fuel tank (not shown) is formed below the housing through the partition wall 23 (see FIG. 4).

Positioning concave portions 51, 51 having groove shapes are formed by notching at two positions facing each other in the radial direction on the upper edge portion of the outer peripheral wall 45. As shown in FIG. By fitting the pair of positioning projections 33, 33 of the housing body 20 into one of these positioning recesses 51, the lower cap 40 is positioned below the housing body 20 and mounted in a state where rotation is restricted. be.

Further, as shown in FIG. 3, at the lower end portion of the peripheral wall 41 in the axial direction, a peripheral wall side communication hole 53 having a substantially elongated hole shape extending in a predetermined length along the peripheral direction is formed in the radial direction of the peripheral wall 41. It is formed at two locations facing each other. This peripheral wall side communication hole 53 allows the inside of the fuel tank and the inside of the valve chamber V to communicate with each other. The peripheral wall side communicating hole 53 constitutes the "communicating hole" in the present invention.

The peripheral wall side communication hole 53 communicates the inside of the fuel tank and the inside of the valve chamber V with each other in a non-submerged state (open state without being blocked by the liquid fuel) so that a fuel supply nozzle (not shown) can flow. Continuous refueling is possible, and in a submerged state (a state blocked by liquid fuel), the fuel level in the valve chamber V rises, the float valve 80 closes the opening 25, and a refueling nozzle (not shown) is released. It is configured to stop continuous lubrication of

Returning to the description of the bottom wall 43, the bottom wall 43 is arranged inside the lower end portion of the peripheral wall 41 via a plurality of support protrusions 43a projecting radially inward from the inner periphery of the lower end portion of the peripheral wall 41. It has a substantially circular plate shape (see FIG. 6). As shown in FIG. 4, the bottom wall 43 is arranged below the float valve 80 and supports the lower end of the biasing spring S. As shown in FIG.

Further, the bottom wall 43 is arranged so as to be positioned within the region of the peripheral wall side communication hole 53 . That is, as shown in FIG. 3, when the housing 15 is viewed from the outside in the radial direction, the area of the peripheral wall side communication hole 53 is positioned such that the bottom wall 43 is located above the lower bottom surface of the peripheral wall side communication hole 53 . placed inside.

Further, a spring support projection 55 that supports the base end of the biasing spring S is projected from the center of the top surface of the bottom wall 43 .

Further, as shown in FIG. 6, the peripheral wall 41 is provided with guide ribs 57 that guide the up-and-down motion of the float valve 80 . In this embodiment, a plurality of guide ribs 57 are provided on the inner surface of the peripheral wall 41 at equal intervals in the circumferential direction. Each guide rib 57 has a base end positioned at the support projection 43 a and has a substantially long plate shape extending along the axial direction of the peripheral wall 41 .

Among the plurality of guide ribs 57, predetermined guide ribs 57 are arranged so as to partition the peripheral wall side communication hole 53 into a plurality of regions. In this embodiment, two guide ribs 57, 57 are arranged to extend from the lower bottom surface to the upper ceiling surface of the peripheral wall side communication hole 53, and as shown in FIG. When viewed from the side, the peripheral wall side communication hole 53 is divided into three areas.

Further, as shown in FIG. 6, the bottom wall 43 is formed with a plurality of bottom wall side communication holes 59 that allow the inside of the fuel tank and the inside of the valve chamber V to communicate with each other. Each bottom wall side communication hole 59 extends along the inner circumference of the peripheral wall 41 . Specifically, each bottom wall side communication hole 59 has a substantially arc shape extending along the inner circumference of the substantially cylindrical peripheral wall 41 so as to conform to the inner circumferential shape of the peripheral wall 41 .

Further, as shown in FIG. 6, the bottom wall 43 has an elastic piece 63 that is flexibly deformable through a slit 61 and supports the bottom surface 81 a of the float valve 80 . In this embodiment, a substantially U-shaped slit 61 communicating with the bottom wall side communication hole 59 is formed inside the bottom wall side communication hole 59 of the bottom wall 43 . An elastic piece 63 is provided whose fixed end side (base end side) is connected to the peripheral wall 41 via 61 and whose free end side (tip side) faces radially inward of the housing body 20 .

7 and 9, the elastic piece 63 includes a first extending portion 64 extending radially inwardly of the housing body 20 from the inner periphery of the peripheral wall 41, and the first extending portion 64 extending from the inner periphery of the peripheral wall 41. 64 extending upward in the axial direction of the housing main body 20; It has a third extension portion 66 that extends further along the edge, and has a shape that extends while being bent in a step-like manner.

A protrusion 66 a protrudes from the upper surface of the tip of the third extension 66 in the extension direction. As shown in FIG. 4, the convex portion 66a contacts the bottom surface 81a of the float valve 80 so that the bottom surface 81a of the float valve 80 is lifted from the top surface of the bottom wall 43 by a predetermined length. is supported above the That is, in the valve device 10 , the float valve 80 is supported by the convex portion 66 a of the third extending portion 66 forming the elastic piece 63 provided on the bottom wall 43 .

When the float valve 80 descends, the convex portion 66a of the third extending portion 66 contacts the bottom surface 81a of the float valve 80, and the base end (fixed end) of the first extending portion 64 is used as a fulcrum, Since the elastic piece 63 as a whole bends and deforms downward, the hammering sound when the float valve 80 is lowered is suppressed.

Further, as shown in FIG. 3, the second extending portion 65 constituting the elastic piece 63 is provided so as to be positioned within the region of the peripheral wall side communication hole 53 when the housing 15 is viewed from the radially outward direction. It is

Further, as shown in FIG. 3, the third extending portion 66 constituting the elastic piece 63 is arranged so as to overlap the bottom wall 43 when the housing 15 is viewed from the radially outward direction (see also FIG. 9). See also), the second extending portion 65 is arranged radially outward of an inflow suppressing wall 67, which will be described later. Further, as shown in FIG. 4 , the convex portion 66a provided on the third extension portion 66 is positioned within the region of the peripheral wall side communication hole 53 .

As shown in FIGS. 4, 8, and 9, the bottom wall 43 supports the float valve 80 at a position outside the outer periphery of the float valve 80 and above the bottom surface 81a of the float valve 80. A plurality of inflow suppression walls 67 are provided so as to protrude upward and are formed apart from the peripheral wall 41 .

As shown in FIG. 3 , each inflow suppression wall 67 is arranged so as to overlap the peripheral wall side communication hole 53 when the housing 15 is viewed from the radially outer side. Here, as shown in FIG. 3, when the housing 15 is viewed from the outside in the radial direction, each inflow suppressing wall 67 is located above the lower bottom surface of the peripheral wall side communication hole 53 . 53 area.

As shown in FIGS. 4, 6, 8, etc., each inflow suppression wall 67 is configured to protrude upward and obliquely outward. It is also configured to be provided from the inner peripheral edge of the wall-side communication hole 59 .

More specifically, as shown in FIG. 6 , a predetermined inflow suppressing wall 67 out of the plurality of inflow suppressing walls 67 is located on the inner peripheral edge (bottom wall) of the bottom wall 43 inside the bottom wall side communication hole 59 . radially outer edge of the wall 43 ), and extends obliquely outward at a predetermined angle from between the side edge of the slit 61 and the outer surface of the guide rib 57 toward the upper axial direction of the housing 15 . It protrudes straight (in a straight line).

Similarly, as shown in FIG. 6, another inflow suppressing wall 67 different from the inflow suppressing wall 67 is an inner peripheral edge portion inside the bottom wall side communication hole 59 of the bottom wall 43 and is located in the housing main body 20. from between the guide ribs 57 , 57 adjacent in the circumferential direction of the housing 15 toward the axial direction upward of the housing 15 and straightly project obliquely outward at a predetermined angle. The inflow suppressing wall 67 in this case extends longer in the circumferential direction of the housing body 20 than the inflow suppressing wall 67 projecting from between the side edge of the slit 61 and the outer surface of the guide rib 57 .

Further, as shown in FIG. 8, the inflow suppressing wall 67 projects so that its tip in the direction of protrusion is positioned within the region of the peripheral wall side communication hole 53, and the tip has a rounded curved surface. shape.

Next, the upper cover 70 mounted above the housing body 20 will be described with reference to FIGS. 1, 4, 8, and the like.

The upper cover 70 has a substantially hat shape, comprising a peripheral wall 71 having a substantially circular outer periphery, a ceiling wall 73 disposed above the peripheral wall 71, and a flange portion 75 extending outward from the lower side of the peripheral wall 71. None. As shown in FIG. 4, a fuel vapor discharge port 77a is formed in the peripheral wall 71, and a fuel vapor discharge pipe 77 extends radially outward from the front peripheral edge of the fuel vapor discharge port 77a. A tube (not shown) connected to the canister is connected to the fuel vapor discharge pipe 77 .

Further, as shown in FIG. 1, a plurality of engagement pieces 79 extend downward from predetermined positions in the circumferential direction of the flange portion 75 . Each engagement piece 79 is formed with an engagement hole 79a. Then, as shown in FIG. 2, the corresponding cover-side engaging protrusions 31 of the housing body 20 are engaged with the engaging holes 79a of the engaging pieces 79 of the upper cover 70, respectively. Thus, the upper cover 70 is mounted above the housing main body 20 with the seal ring 27 mounted in the ring mounting groove 27a in contact with the inner circumference of the peripheral wall 71 of the upper cover 70 . As a result, a ventilation chamber R communicating with the outside of the fuel tank is formed above the partition wall 23 (see FIG. 4).

Next, the float valve 80 housed in the valve chamber V so as to be able to move up and down will be described with reference to FIGS.

As shown in FIG. 4, the float valve 80 of this embodiment includes a float body 81 having a circular outer periphery, which generates buoyancy when immersed in fuel, and is mounted above the float body 81. and a sealing member 83 that moves up and down relative to the opening 25 and contacts and separates from the opening 25 .

A seal valve body 85 made of an elastic material such as rubber or elastic elastomer is mounted above the seal member 83 . A vent hole 85a is formed through the center of the seal valve body 85 and is open upward and downward. The float valve 80 functions as a full tank regulation valve by the seal valve body 85 coming into contact with and separating from the back side peripheral portion of the opening 25 to open and close the opening 25 . Further, the convex portion 66a of the third extending portion 66 of the elastic piece 63 abuts against the bottom surface 81a positioned at the lower end of the float body 81 in the axial direction. The float main body 81 is formed with a spring housing recess 81b that is open at the bottom, and the urging spring S is housed in the spring housing recess 81b.

Further, an intermediate valve body 87 is tiltably supported between the float body 81 and the seal member 83 (see FIG. 4). The intermediate valve body 87 is normally in contact with the lower end of the seal valve body 85 to close the vent hole 85a (see FIG. 4). 85a is opened.

The float valve 80 is housed in the valve chamber V so as to be able to move up and down between the lower cap 40 and the biasing spring S. It rises by biasing force and descends by its own weight when not immersed in fuel.

(Modification)
The shape and structure of the housing constituting the present invention, the housing body constituting the housing body, the lower cap, the upper cover, the elastic piece, the inflow control wall, the float valve, etc. are not limited to the above embodiments.

Further, although the housing 15 in the above embodiment is composed of the housing main body 20, the lower cap 40, and the upper cover 70, the housing may have a structure having at least a peripheral wall and a bottom wall.

Furthermore, although the peripheral wall 21 of the housing body 20 and the peripheral wall 41 of the lower cap 40 in this embodiment are substantially cylindrical, they may be elliptical or rectangular, for example.

Further, the float valve 80 in this embodiment has a multi-part structure including a float main body 81, a seal member 83, an intermediate valve body 87, and the like. A float valve or the like equipped with a member may be used as long as the opening 25 can be opened and closed.

Furthermore, in this embodiment, one float valve 80 is accommodated in one valve chamber V formed in the housing 15. For example, a plurality of float valves may be arranged in one valve chamber. (functions as a fuel cut valve, pressure control valve, etc., in addition to a full-tank regulation valve), or by defining a plurality of valve chambers in the housing and arranging a float valve in each valve chamber. You may

Further, the inflow suppression wall 67 in this embodiment is arranged so as to overlap with the peripheral wall side communication hole 53 when the housing 15 is viewed from the outside in the radial direction, and is configured to project obliquely outward upward. (that is, it has two characteristics), the inflow suppression wall is arranged so as to overlap the peripheral wall side communication hole when the housing is viewed from the radially outward direction, or Alternatively, it may only be configured to protrude obliquely outward toward the upper side.

Further, the inflow suppression wall 67 of this embodiment extends obliquely outward at a predetermined angle from the inner peripheral edge of the bottom wall 43 inside the bottom wall side communication hole 59 toward the upper axial direction of the housing 15 . As the inflow suppression wall, for example, it may (1) protrude upward and obliquely outward while drawing a curved shape or curved surface shape from the inner peripheral edge of the bottom wall, or (2) protrude at a predetermined angle By providing a plurality of linearly protruding parts at different angles, the inflow suppressing wall as a whole has a shape that protrudes upward and obliquely outward (for example, the base end side protrudes at a gentle angle, and the tip (the part side protrudes at a steep angle). Furthermore, the tip of the inflow suppressing wall 67 of this embodiment is positioned within the region of the peripheral wall side communication hole 53, but the tip of the inflow suppressing wall extends beyond the upper ceiling surface of the peripheral wall side communicating hole. May protrude.

In addition, the elastic piece 63 in this embodiment has a first extension portion 64, a second extension portion 65, and a third extension portion 66, and has a shape that extends while bending stepwise. However, as the elastic piece, for example, it has a shape that extends straight upward from the inner circumference of the peripheral wall toward the radial direction inner side, or a shape that extends while drawing a curved shape or curved surface shape from the inner peripheral wall of the peripheral wall toward the radial direction inner side. , as long as it can be flexurally deformed and can support the bottom surface of the float valve.

(Effect)
Next, the effects of the valve device 10 having the structure described above will be described.

As shown in FIG. 4, when the fuel tank is not sufficiently filled with fuel and the float valve 80 is not immersed in the fuel, the float valve 80 moves downward under its own weight to open the opening 25. , the valve chamber V and the ventilation chamber R communicate with each other through the opening 25 .

When fuel is supplied to the fuel tank in this state, mainly the air in the fuel tank flows into the valve chamber V from the bottom wall side communication hole 59 of the lower cap 40, and the float valve 80 and the lower part It flows upward through the gap between the peripheral wall 41 of the cap 40 and the peripheral wall 21 of the housing body 20, flows into the ventilation chamber R from the opening 25, and is discharged to the canister outside the fuel tank. . In this way, the air in the fuel tank is discharged to the outside of the fuel tank, so that the fuel can be refueled into the fuel tank.

As fuel is supplied into the fuel tank from the state shown in FIG. fuel is immersed in Then, when the fuel level in the fuel tank reaches the set full tank level, that is, when the peripheral wall side communication hole 53 is blocked and submerged, the biasing force of the biasing spring S and the float valve The buoyancy of the float body 81 itself of the float valve 80 raises the float valve 80 , and the seal valve body 85 abuts against the back side peripheral edge of the opening 25 to close the opening 25 . As a result, air communication between the valve chamber V and the ventilation chamber R through the opening 25 is blocked. Then, the fuel in the fuel tank rises up the refueling pipe provided in the fuel tank, and the fuel comes into contact with the full tank detection sensor of the refueling nozzle inserted into the refueling port and detects full tank, so it goes into the fuel tank. refueling is stopped, and full-tank regulation can be achieved.

4 and 8, when fuel is supplied into the fuel tank, fluid such as air or fuel vapor in the fuel tank flows from the peripheral wall side communication hole 53 into the valve chamber V. can flow inside.

In this regard, in the valve device 10, as shown in FIGS. A plurality of inflow control walls 67 are provided so as to project upward from the bottom surface 81a of the float valve 80. As shown in FIG. Sometimes, it is arranged so as to overlap with the peripheral wall side communication hole 53 .

Therefore, the fluid that has flowed into the valve chamber V from the peripheral wall side communication hole 53 collides with the inflow suppression wall 67 , so that the fluid can be made difficult to flow into the bottom surface 81 a side of the float valve 80 . As a result, when the fluid blows up during refueling or the like, the fluid pushes up from the bottom surface 81a side of the float valve 80, so that the float valve 80 is less likely to float.

In the case of a valve device 10' without an inflow control wall 67, as shown in FIG. It becomes easy to enter the gap between the upper surface and the float valve 80 (see the arrow in FIG. 10), and the float valve 80 is easily lifted by being pushed up from the bottom surface 81a side.

4, 8, and 9, the float valve 80 is supported by the bottom wall 43, and the float valve 80 is positioned outside the outer circumference of the float valve 80. A plurality of inflow suppressing walls 67 are provided so as to protrude upward from the bottom surface 81a of the valve 80, and these inflow suppressing walls protrude obliquely outward upward.

Therefore, for example, the fluid that has flowed into the valve chamber V from the communication hole 35 of the housing body 20, the peripheral wall side communication hole 53 of the lower cap 40, etc. collides with the inflow suppression wall 67, and its flow direction is 8, the fluid can be made difficult to flow into the bottom surface 81a side of the float valve 80. As a result, when the fluid blows up during refueling or the like, the fluid pushes up from the bottom surface 81a side of the float valve 80, so that the float valve 80 is less likely to float.

4, 8, and 9, the float valve 80 is supported by the bottom wall 43, and the float valve 80 is positioned outside the outer circumference of the float valve 80. A plurality of inflow suppressing walls 67 are formed to protrude upward from the bottom surface 81a of the valve 80, and the bottom wall 43 has a bottom wall side communicating wall that allows the inside of the fuel tank and the inside of the valve chamber V to communicate with each other. A hole 59 is formed, and an inflow suppression wall 67 is provided from the inner peripheral edge of the bottom wall side communication hole 59 .

Therefore, as indicated by an arrow F3 in FIG. 8, the fluid that has flowed into the valve chamber V from the bottom wall side communication hole 59 collides with the inflow suppression wall 67, so that the fluid flows into the bottom surface 81a side of the float valve 80. can be made difficult. As a result, when the fluid blows up during refueling or the like, the fluid pushes up from the bottom surface 81a side of the float valve 80, so that the float valve 80 is less likely to float.

Furthermore, in this embodiment, as shown in FIGS. 4, 6, and 8, the bottom wall 43 is elastically deformable through slits 61 and supports the bottom surface 81a of the float valve 80. The elastic piece 63 has a first extending portion 64 extending radially inward of the housing 15 from the inner circumference of the peripheral wall 41, and from the tip of the first extending portion 64, It has a second extending portion 65 extending upward in the axial direction of the housing 15 and a third extending portion 66 further extending radially inward of the housing 15 from the tip of the second extending portion 65 . As shown in FIG. 3, the second extending portion 65 is provided so as to be positioned within the region of the peripheral wall side communication hole 53 when the housing 15 is viewed from the radial direction.

According to the above aspect, the bottom wall 43 is formed to be flexibly deformable and has the elastic piece 63 that supports the bottom surface 81a of the float valve 80, thereby suppressing the hammering sound when the float valve 80 is lowered. In addition, the second extending portion 65 of the elastic piece 63 is provided so as to be positioned within the region of the peripheral wall side communication hole 53 when the housing 15 is viewed from the radial direction. The fluid that has flowed into the valve chamber V from 53 collides not only with the inflow suppression wall 67 but also with the second extending portion 65 of the elastic piece 63, and has flowed into the valve chamber V from the peripheral wall side communication hole 53. can be made more difficult to flow into the bottom surface 81 a side of the float valve 80 .

In this embodiment, as shown in FIG. 3, the third extending portion 66 constituting the elastic piece 63 is arranged so as to overlap the bottom wall 43, and the second extending portion 65 will be described later. It is arranged radially outward of the inflow suppression wall 67 .

According to the above aspect, the third extending portion 66 is arranged so as to overlap the bottom wall 43, and the second extending portion 65 is arranged radially outward of the inflow suppression wall 67. , the second extending portion 65 and the third extending portion 66 constituting the elastic piece 63 cooperate with the bottom wall 43 and the inflow suppressing wall 67 formed on the bottom wall 43 to allow the valve from the peripheral wall side communication hole 53 to flow. To inhibit the flow of the fluid that has flowed into the chamber V, and to make it more difficult for the fluid that has flowed into the valve chamber V from the peripheral wall side communication hole 53 to flow into the bottom surface 81a side of the float valve 80 more effectively. can be done.

In addition, the present invention is not limited to the above-described embodiments, and various modified embodiments are possible within the scope of the present invention, and such embodiments are also included in the scope of the present invention. .

10 Valve Device 15 Housing 20 Housing Body 21 Peripheral Wall 23 Partition Wall 25 Opening 40 Lower Cap 41 Peripheral Wall 43 Bottom Wall 53 Peripheral Wall Side Communication Hole 59 Bottom Wall Side Communication Hole 61 Slit 63 Elastic Piece 64 First Extension 65 Second Extension Protruding portion 66 Third extending portion 67 Inflow suppression wall 70 Upper cover 80 Float valve V Valve chamber R Ventilation chamber S Biasing spring

Claims (6)

Via a partition wall, a valve chamber downwardly communicating with the inside of the fuel tank and a ventilation chamber upwardly communicating with the outside of the fuel tank are provided, and an opening communicating the valve chamber and the ventilation chamber is formed in the partition wall. a housing;
a float valve that is housed in the valve chamber so as to be able to move up and down and closes the opening;
The housing has a peripheral wall formed with a peripheral-wall-side communication hole communicating between the inside of the fuel tank and the valve chamber, and a bottom wall arranged below the peripheral wall,
The bottom wall is provided with an inflow suppression wall formed to protrude above the bottom surface of the float valve outside the outer circumference of the float valve while the float valve is supported. 2. A valve device according to claim 1, wherein said inflow suppression wall is arranged so as to overlap said peripheral wall side communication hole when said housing is viewed from a radial direction. Via a partition wall, a valve chamber downwardly communicating with the inside of the fuel tank and a ventilation chamber upwardly communicating with the outside of the fuel tank are provided, and an opening communicating the valve chamber and the ventilation chamber is formed in the partition wall. a housing;
a float valve that is housed in the valve chamber so as to be able to move up and down and closes the opening;
The housing has a peripheral wall formed with a peripheral-wall-side communication hole communicating between the inside of the fuel tank and the valve chamber, and a bottom wall arranged below the peripheral wall,
The bottom wall is provided with an inflow suppression wall formed to protrude above the bottom surface of the float valve outside the outer circumference of the float valve while the float valve is supported. 2. A valve device according to claim 1, wherein said inflow suppression wall protrudes obliquely outward upward. Via a partition wall, a valve chamber downwardly communicating with the inside of the fuel tank and a ventilation chamber upwardly communicating with the outside of the fuel tank are provided, and an opening communicating the valve chamber and the ventilation chamber is formed in the partition wall. a housing;
a float valve that is housed in the valve chamber so as to be able to move up and down and closes the opening;
The housing has a peripheral wall and a bottom wall arranged below the peripheral wall,
The bottom wall is provided with an inflow suppression wall formed to protrude above the bottom surface of the float valve outside the outer circumference of the float valve while the float valve is supported. ,
Further, the bottom wall is formed with a bottom wall side communication hole for communicating the inside of the fuel tank and the valve chamber with each other,
A valve device, wherein the inflow suppression wall is provided from the inner peripheral edge of the bottom wall side communication hole. 4. The valve device according to claim 1, wherein the inflow suppression wall protrudes obliquely outward upward. The bottom wall has an elastic piece that is formed to be flexibly deformable through a slit and supports the bottom surface of the float valve,
The elastic piece is
a first extending portion extending radially inward of the housing from the inner periphery of the peripheral wall;
a second extension extending upward in the axial direction of the housing from the tip of the first extension;
a third extension further extending radially inward of the housing from the tip of the second extension,
3. The valve device according to claim 1, wherein the second extending portion is provided so as to be positioned within the region of the peripheral wall side communication hole when the housing is viewed from the radial direction. The third extending portion is arranged to overlap the bottom wall when the housing is viewed from the radial direction,
6. The valve device according to claim 5, wherein the second extending portion is arranged radially outward of the inflow suppression wall.

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