JP7115890B2 - valve device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a valve device having a float valve and used as a fuel outflow prevention valve or the like.

For example, a fuel tank of a vehicle such as a motorcycle or an automobile is equipped with a valve device that prevents fuel in the fuel tank from leaking out of the fuel tank when the vehicle tilts or overturns.

This valve device generally has a housing and a float valve. The housing is formed with a partition wall having an opening to form a ventilation chamber in the upper part and a valve chamber in the lower part. positioned as possible. Then, when the fuel swings and buoyancy acts on the float valve, the float valve rises and closes the opening, restricting the inflow of fuel into the ventilation chamber. However, if the vehicle is driven on rough roads, etc. and the fuel level shakes violently, the fuel will forcefully blow out from the opening and flow into the ventilation chamber before the float valve rises and closes the opening. I had something to do.

In order to deal with such a problem, for example, Patent Document 1 below discloses an upper case having an evaporation opening formed in an upper wall portion, and an upper case mounted above the upper case to define a ventilation chamber and a lateral A fuel outflow control device is described which includes a cover having a nipple extending from the upper case, a cylindrical body attached to the lower part of the upper case, and a float valve disposed in the upper case so as to be able to move up and down to open and close an evaporator opening. there is A cylindrical liquid receiver protrudes from the inner surface of the ceiling wall of the cover toward the evaporator opening. When the fuel surface moves up and down violently and the fuel is ejected from the evaporator opening, the fuel collides with the liquid receiving portion and drops, so that the fuel is prevented from entering the nipple side.

Japanese Patent No. 3953916

In the case of the device of Patent Document 1, when the timing at which the fuel collides with the liquid receiving portion is to be advanced in order to suppress the diffusion of the fuel ejected from the evaporative opening, the ceiling wall of the cover provided with the liquid receiving portion is removed. need to lower. In this case, the volume of the ventilation chamber is reduced, making it difficult for the fuel vapor in the fuel tank to circulate.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a valve device that maintains the volume of the vent chamber and makes it easier for the fuel flowing into the vent chamber from the valve hole of the case to collide with the fuel, thereby suppressing the diffusion of the fuel. .

In order to achieve the above object, the valve device of the present invention includes a case having a partition wall formed with a first valve hole above, and a valve chamber provided below the partition wall and communicating with a fuel tank; A cover mounted above the case to provide a ventilation chamber between itself and the partition wall, a fuel vapor pipe provided on the cover or the case and communicating with the ventilation chamber, and vertically housed in the valve chamber. and a float valve that opens and closes the first valve hole, is connected to the case, and is arranged in the ventilation chamber above the partition wall so as to face the first valve hole. characterized by having a collision wall portion.

According to the present invention, the collision wall portion is arranged in the vent chamber above the partition wall so as to face the first valve hole. Even if the fuel flows into the ventilation chamber from the first valve hole, it is possible to prevent the fuel from colliding with the collision wall portion and diffusing to the surroundings, thereby preventing the fuel from entering the fuel vapor pipe. Further, the collision wall portion is not provided on the cover side, but is connected to the case so as to face the first valve hole above the partition wall. A valve device in which a collision wall portion can be provided at a position close to the first valve hole, and as a result, it is possible to effectively suppress the inflow of fuel from the first valve hole to the side of the ventilation chamber while ensuring the volume of the ventilation chamber. can be obtained.

1 is an exploded perspective view showing one embodiment of a valve device according to the present invention; FIG. FIG. 2 shows a collision wall portion constituting the same valve device, (a) is a perspective view thereof, and (b) is a perspective view when viewed from a direction different from (a). It is a perspective view which shows the state which assembled|attached the collision wall part to the case which comprises the same valve apparatus. FIG. 4 is a cross-sectional view of the same valve device in which the float valve is lowered to open the first valve hole; In the same valve device, it is sectional drawing of the state which the float valve rose and the 1st valve hole closed. Fig. 2 shows another embodiment of a valve device according to the invention, in cross-section thereof; It is a perspective view of the collision wall part which comprises the same valve apparatus. Fig. 3 shows yet another embodiment of the valve device according to the invention, and is a cross-sectional view thereof; FIG. 10 shows a swing test of the valve device, where (a) is an explanatory diagram when the fuel level is horizontal, and (b) is an explanatory diagram when the fuel tank is tilted at 42° with respect to the fuel level. .

An embodiment of the valve device according to the present invention will be described below with reference to FIGS. 1 to 5. FIG. In the following description, "fuel" means liquid fuel (including droplets of fuel), and "fuel vapor" means vaporized fuel.

As shown in FIGS. 1 and 4, the valve device 10 of this embodiment includes a case body 20 which has a partition wall 23 formed with a first valve hole 27 on the upper side and a substantially cylindrical case body 20 which is open on the lower side. and a cap 40 attached below the case main body 20 . A cover 50 having a fuel vapor pipe 57 is attached above the case 15 . Further, as shown in FIGS. 1 and 4, the valve device 10 includes a float valve 60 housed in the valve chamber V of the case 15 so as to be movable up and down, and a float valve 60 connected to the case 15 and disposed in the ventilation chamber R. A collision wall portion 70 is arranged above the partition wall 23 so as to face the first valve hole 27 .

The case body 20 has a substantially cylindrical peripheral wall 21, and a partition wall 23 is arranged above it. The peripheral wall 21 is formed with a plurality of ventilation holes 21a and a locking hole 21b at the bottom. A locking protrusion 21 c is provided above the peripheral wall 21 . Further, the cap 40 has a plurality of through holes 41 and a plurality of locking claws 43 formed on the outer periphery thereof.

Therefore, by engaging the locking claws 43 of the cap 40 with the locking holes 21b of the case body 20, the cap 40 is mounted below the case body 20 as shown in FIGS. A valve chamber V (see FIG. 4) communicating with the fuel tank 1 is formed on the lower side of the case via the wall 23 . By attaching the cover 50 above the case main body 20 , a ventilation chamber R (see FIG. 4 ) is formed on the upper side of the case via the partition wall 23 .

A float valve 60 is arranged in the valve chamber V so as to be movable up and down with a first spring 63 interposed between the float valve 60 and the cap 40 . From the center of the upper surface of this float valve 60, a valve head 61 having a substantially conical shape whose tip is cut flat protrudes. The float valve 60 rises by its own buoyancy and the biasing force of the first spring 63 when immersed in fuel, and descends by its own weight when not immersed in fuel.

Returning to the description of the case body 20, as shown in FIG. 4, the partition wall 23 of this embodiment is provided on the inner periphery of the upper opening of the peripheral wall 21, and is formed with a bottom wall 24 having a circular hole 24a formed in the center. , the bottom wall 24 is composed of a cylindrical wall 25 erected from the outer peripheral edge of the circular hole 24a, and an upper wall 26 provided on the inner periphery of the upper end of the cylindrical wall 25. As shown in FIG.

A first valve hole 27 communicating with the inner space of the cylindrical wall 25 is formed in the center of the upper wall 26, and a valve seat 27a protrudes from the periphery of the lower surface of the first valve hole 27. As shown in FIG. The valve head 61 of the float valve 60 contacts and separates from the valve seat 27a to open and close the first valve hole 27 (see FIGS. 4 and 5). Also, the valve chamber V and the ventilation chamber R in the case 15 are communicated through the first valve hole 27 . Further, as shown in FIG. 4, the upper surface of the upper wall 26 has a mortar shape with a higher outer peripheral portion and a gradually lower surface toward the center in the radial direction.

Note that the partition wall in this embodiment has a shape in which the central portion is raised in a cylindrical shape (see cylindrical wall 25), but for example, it may be in the form of a disk disposed on the periphery of the upper opening of the case body 20. Alternatively, it may be in the shape of a disc disposed in the middle of the peripheral wall 21 in the axial direction, and its shape, position, etc. are not particularly limited.

Further, a cylindrical rib 29 is erected at a predetermined height from the peripheral edge of the upper wall 26 forming the partition wall 23 so as to surround the entire periphery of the first valve hole 27 . As shown in FIGS. 3 and 4, inside the rib 29, a later-described restricting wall 77 of the collision wall portion 70 is arranged. In this embodiment, the rib 29 has a cylindrical shape surrounding the entire circumference of the first valve hole 27, but the rib may have a shape in which a part of the rib is notched in the circumferential direction. , the partition wall may be provided on the collision wall portion 70 side surface, and may have a shape capable of at least partially surrounding the first valve hole 27 .

An annular wall 30 which is concentric with the tubular wall 25 and which is the surface of the bottom wall 24 constituting the partition wall 23 on the side of the collision wall 70 and is located on the outer periphery of the tubular wall 25 . is erected with a length shorter than that of the tubular wall 25. - 特許庁By providing the annular wall 30 , a fuel storage space 31 is formed between the bottom wall 24 , the annular wall 30 and the cylindrical wall 25 . there is

Further, as shown in FIG. 4, a circular second valve hole 32 is formed at a predetermined location of the bottom wall 24 where the fuel storage space 31 is located. The second valve hole 32 allows the fuel storage space 31 located in the ventilation chamber R and the valve chamber V to communicate with each other. The inner peripheral surface of the second valve hole 32 on the vent chamber R side forms a tapered valve seat 32a. A metal ball-shaped relief valve 65 contacts and separates from the valve seat 32 a to open and close the second valve hole 32 .

As shown in FIGS. 4 and 5, the relief valve 65 is pushed from above by a second spring 67 and biased in the direction of closing the second valve hole 32 . When the pressure of the fuel vapor in the fuel tank 1 rises due to the running of the vehicle or the like, the relief valve 65 is pushed up against the urging force of the second spring 67 and separated from the valve seat 32a to move to the second valve. By opening the valve hole 32 (see the two-dot chain line in FIG. 5), the fuel vapor is released to the ventilation chamber R side.

Furthermore, the relief valve 65 is made of metal, the case 15 is made of resin, and the valve seat 32a is also made of resin. is configured to Therefore, even when the relief valve 65 closes the second valve hole 32 , the air in the ventilation chamber R can flow into the valve chamber V through the second valve hole 32 . Although the relief valve 65 of this embodiment has a spherical ball shape, it may have a plate shape or the like, and is not particularly limited.

As shown in FIG. 1, a pair of prismatic collision wall support portions 34, 34 are erected from both circumferential sides of the second valve hole 32 in the fuel storage space 31 of the bottom wall 24. A pair of substantially cylindrical collision wall fixing portions 35, 35 are erected from both sides of the cylindrical wall 25 in the circumferential direction. The pair of collision wall support portions 34, 34 are portions that support both sides of the collision wall portion 70 on the base end side. This is the part that fixes the fixed arms 75 , 75 .

Further, as shown in FIGS. 1 and 4 , an annular convex mounting portion 36 is provided from the upper peripheral edge of the peripheral wall 21 . A concave portion 37 having an annular concave shape is formed between the inner circumference of the .

Next, the cover 50 will be explained. As shown in FIG. 1, the cover 50 of this embodiment includes a cylindrical peripheral wall 51, a ceiling wall 53 that closes the upper side of the peripheral wall 51, and a flange-like attachment that spreads from the lower peripheral edge of the peripheral wall 51. , and has a substantially hat shape as a whole. A frame-shaped locking piece 55 that is locked to the locking projection 21 c of the case body 20 is vertically provided from the lower surface side of the mounting portion 54 . Further, as shown in FIG. 4 , an annular projection 56 is projected from the inner surface of the mounting portion 54 to be inserted into the recess 37 on the side of the case body 20 . The valve device 10 is attached to the fuel tank 1 by bonding, welding, or the like the lower peripheral edge of the mounting portion 54 to the front peripheral edge of the opening 1a of the fuel tank 1 (see FIG. 1). 4).

As shown in FIG. 4, a circular ventilation hole 57a communicating with the ventilation chamber R is formed at a predetermined position in the circumferential direction of the peripheral wall 51. A fuel vapor pipe 57 having a shape extends for a predetermined length. A tube (not shown) communicating with a canister or the like arranged outside the fuel tank 1 is connected to the fuel vapor pipe 57 .

Then, as shown in FIG. 4, with the seal ring 58 attached to the outer periphery of the annular wall 30 of the case main body 20, the convex portion 56 of the cover 50 is inserted into the concave portion 37 of the case main body 20, and the seal ring 58 is removed. The case body 20 is clamped and the frame-shaped locking pieces 55 are locked to the locking protrusions 21 c of the case body 20 so that the ventilation chamber R is formed between the case body 20 and the partition wall 23 . A cover 50 is attached above. At this time, the cover 50 is attached to the case body 20 so that the vent hole 57a and the fuel vapor pipe 57 are located on the opposite side of the case 15 in the circumferential direction with respect to the second valve hole 32 provided in the case body 20. (see FIGS. 4 and 5).

In this embodiment, the cover 50 has a substantially hat-like shape with a raised central portion in order to form the ventilation chamber R, and the fuel vapor pipe 57 is provided on the cover 50 side. For example, a wall portion for forming the ventilation chamber R may be provided on the case 15 side, the cover may be simply plate-shaped, and the fuel vapor pipe may be provided on the case side. That is, the fuel vapor lines may be provided in either the cover or the case.

Next, the collision wall portion 70 will be described. The collision wall portion 70 in this embodiment is a separate member separate from the case 15 and a separate member separate from the cover 50, and is shown in FIGS. , it has a substantially rectangular elongated plate shape.

Furthermore, projections 73 , 73 perpendicular to the surface direction of the collision wall portion 70 extend for a predetermined length from both sides of the collision wall portion 70 on the base end side in the longitudinal direction. A fixed arm 75 extends from the tip of each projection 73 in the extending direction toward the tip of the collision wall 70 in the longitudinal direction and parallel to the surface direction of the collision wall 70 . there is Each fixed arm 75 has a shape that is narrow on the base end side and gradually widens toward the distal end side, and a circular fixing hole 75a is formed on the distal end side.

By inserting the tip portions 35a, 35a of the pair of collision wall fixing portions 35, 35 provided on the case body 20 into the fixing holes 75a, 75a of the pair of fixing arms 75, 75, the case body 20 is The collision wall portion 70 is positioned and prevented from rotating, and the upper end surfaces of the pair of collision wall support portions 34 , 34 provided on the case body 20 are the surfaces 71 of the collision wall portion 70 facing the partition wall 23 of the case 15 . (hereinafter also simply referred to as "opposing surface 71"), and the impact wall portion 70 is supported by abutting on the proximal end side in the longitudinal direction. In this state, the front end portion 35a of the collision wall fixing portion 35 inserted into the fixing hole 75a of the fixing arm 75 is welded or adhered, so that the collision wall is attached to the case body 20 as shown in FIG. The portion 70 is fixed, and the collision wall portion 70 is connected to the case 15 .

In a state in which the impact wall portion 70 having the structure described above is connected to the case 15, the impact wall portion 70 is, as shown in FIGS. Inside and above the partition wall 23 provided in the case 15 , it is arranged so as to face the first valve hole 27 .

In this embodiment, when the collision wall portion 70 is connected to the case 15, as shown in FIGS. , and perpendicular to the opening direction of the first valve hole 27 (the axial direction of the case 15).

Further, in a state where the collision wall portion 70 is connected to the case 15, as shown in FIGS. They are arranged to be spaced apart with a gap S therebetween. In this embodiment, the collision wall portion 70 is arranged such that the inner surface of the ceiling wall 53 and the surface of the collision wall portion 70 opposite to the facing surface 71 are parallel to each other. The gap S is preferably 1.0 mm or less, more preferably 0.5 mm or less.

In the present invention, the collision wall is "connected to the case" on the premise that the collision wall is separate from the cover. or (2) when the collision wall is integral with the case, it is attached to the case. On the other hand, it means that the collision wall portion is formed integrally with the case so as to be continuous in the axial direction.

In addition, from the position of the collision wall portion 70 facing the partition wall 23 of the case 15 and slightly closer to the tip than the center in the longitudinal direction, downward (that is, toward the partition wall 23 side) ), and a semi-cylindrical restricting wall 77 which is open laterally and downwardly extends for a predetermined length. Specifically, as shown in FIG. 2B, the regulation wall 77 of this embodiment extends perpendicularly to the surface direction of the collision wall portion 70 and the collision wall portion 70 is connected to the case 15. It has a semi-cylindrical shape with an opening 77a directed toward the fuel vapor pipe 57 provided in the cover 50 when installed.

Further, the restriction wall 77 is fixed to the case body 20 via the pair of fixing arms 75, 75 in a state in which the collision wall portion 70 is connected to the case 15, as described above. 4 and 5, it overlaps (laps) the rib 29 surrounding the first valve hole 27 of the case body 20 in the axial direction, and is further than the rib 29. It is arranged so as to be positioned close to the first valve hole 27 .

In this embodiment, the restricting wall 77 has a semi-cylindrical shape with an opening on the side of the fuel vapor pipe 57 (see FIG. 2B). , a U-shaped frame or a V-shaped frame, or the opening provided in the wall may be positioned so as not to align with the fuel vapor pipe 57 . The shape is not limited as long as it overlaps with the rib 29 in the axial direction and can be arranged at a position closer to the first valve hole 27 than the rib 29 .

A relief valve support portion 79 having a cylindrical shape extends from the opposing surface 71 of the collision wall portion 70 in the longitudinal direction to a predetermined length perpendicular to the surface direction of the collision wall portion 70 . length (see FIG. 2(B)). As shown in FIG. 4 , the relief valve support portion 79 extends longer toward the partition wall 23 side than the regulation wall 77 .

The relief valve support portion 79 is inserted into the inner periphery of the upper end portion of the second spring 67 that urges the ball-shaped relief valve 65 to support the upper end portion of the second spring 67 and It indirectly supports the relief valve 65 via 67 . Thus, in this embodiment, the collision wall portion 70 provided separately from the case 15 serves as a support portion for supporting the relief valve 65 . The relief valve support portion may be extended to a position close to the relief valve to the extent that the relief valve's movable range is not impaired (in this case, the relief valve is directly supported). The shape and structure of the part are not particularly limited.

Next, the effects of the valve device 10 of the present invention configured as described above will be described.

As shown in FIG. 4, when the fuel level in the fuel tank 1 does not rise and the float valve 60 is not immersed in fuel, the first valve hole 27 is open. Also, the relief valve 65 is biased by the second spring 67 to close the second valve hole 32 . In this state, when the fuel vapor in the fuel tank 1 increases and the tank internal pressure rises due to the running of the vehicle or the like, the fuel vapor is released from the vent hole 41 of the cap 40 or the vent hole 21a of the case body 20 to the valve. It flows into the chamber V, passes through the first valve hole 27, flows into the ventilation chamber R, is sent to a canister (not shown) through the fuel vapor pipe 57, and the pressure in the fuel tank 1 rises. Suppressed.

When the vehicle turns a curve, travels on an uneven road or slope, or falls due to an accident, the fuel in the fuel tank violently shakes and the fuel level rises. The float valve 60 rises due to the biasing force of the first spring 63 and the buoyancy of the float valve 60 itself, and as shown in FIG. Therefore, fuel is prevented from flowing into the ventilation chamber R through the first valve hole 27, and fuel leakage to the outside of the fuel tank 1 can be prevented.

As shown in FIG. 5, when the float valve 60 is raised to close the first valve hole 27 and the fuel vapor in the fuel tank continues to increase and the tank internal pressure rises, the second spring 67 Since the relief valve 65 is pushed up against the urging force to open the second valve hole 32 (see the two-dot chain line in FIG. 5), the fuel vapor can be released to the ventilation chamber R side.

By the way, as shown in FIG. 5, the float valve 60 rises when the fuel swings, and the valve head 61 enters the first valve hole 27 and comes into contact with the inner circumference of the valve seat 27a. is closed, even if the fuel level returns to the horizontal level and the float valve 60 no longer has buoyancy, the valve head 61 of the float valve 60 sticks to the valve seat 27a, and the float valve 60 may not descend under its own weight (called a stick state, etc.).

At this time, as described above, even when the relief valve 65 closes the second valve hole 32, the structure allows the air in the ventilation chamber R to flow into the valve chamber V through the second valve hole 32. Therefore, the air in the ventilation chamber R can be sucked into the valve chamber V side, and the pressure in the ventilation chamber R can be varied. The float valve 60 can be easily lowered by making it easier to separate from 27a.

On the other hand, the fuel in the fuel tank fluctuates violently due to the reasons described above (when the vehicle turns a curve, travels on an uneven road or slope, or falls due to an accident). In this case, before the float valve 60 rises to close the first valve hole 27, the fuel is vigorously ejected from the first valve hole 27 toward the ventilation chamber R as indicated by the arrow in FIG. It sometimes flowed into the room R side.

At this time, since the valve device 10 has the collision wall portion 70 arranged to face the first valve hole 27 above the partition wall 23 in the ventilation chamber R, as described above, Even if the fuel vigorously ejected from the first valve hole 27 flows into the ventilation chamber R side, the fuel can be prevented from colliding with the collision wall portion 70 and diffusing around the first valve hole 27. Therefore, it is possible to prevent fuel from entering the fuel vapor pipe 57 through the vent hole 57a, and to prevent fuel leakage to the outside of the fuel tank 1.

The fuel that has collided with the collision wall portion 70 falls into the space between the upper wall 26 and the rib 29 surrounding the outer peripheral edge of the upper wall 26 and travels along the upper surface of the mortar-shaped upper wall 26 to reach the first The fuel is returned to the valve chamber V through the valve hole 27, or falls into the annular frame-shaped fuel storage space 31 with an open top, and is stored in the fuel storage space 31.

Further, the collision wall portion 70 is not provided on the cover 50 side, but is connected to the case 15 above the partition wall 23 so as to face the first valve hole 27. The collision wall portion 70 can be provided at a position close to the first valve hole 27 without lowering the ceiling wall 53 provided in the cover 50 that defines the ventilation chamber R, and as a result, the volume of the ventilation chamber R can be secured. However, it is possible to obtain the valve device 10 that can effectively suppress the inflow of fuel from the first valve hole 27 to the ventilation chamber R side.

Further, in this embodiment, as shown in FIGS. 4 and 5, the collision wall portion 70 is arranged below the ceiling wall 53 provided on the cover 50 with a predetermined gap S therebetween. It has become so. Therefore, even if the fuel ejected from the first valve hole 27 and flowed into the ventilation chamber R adheres to the ceiling wall 53, the fuel is easily trapped in the gap S between the ceiling wall 53 and the collision wall portion 70. , and the inflow of fuel into the fuel vapor pipe 57 can be effectively suppressed.

Further, in this embodiment, as shown in FIG. 4 , a rib 29 surrounding the entire circumference of the first valve hole 27 is provided on the peripheral edge of the upper wall 26 that constitutes the partition wall 23 . is provided at a position closer to the first valve hole 27 than the rib 29 is. Thus, the rib 29 that at least partially surrounds the circumference of the first valve hole 27 and the restricting wall 77 axially overlapping the rib 29 are provided at a position closer to the first valve hole 27 than the rib 29 is. As a result, the fuel jetted from the first valve hole 27 and flowing into the vent chamber R side can easily collide with the rib 29 and the regulation wall 77, making it more difficult for the fuel to diffuse. Inflow of fuel into the fuel vapor pipe 57 can be further effectively suppressed.

In this embodiment, as shown in FIG. 2(B), the restriction wall 77 provided in the collision wall portion 70 has a semi-cylindrical shape with an opening on the side of the fuel vapor pipe 57. Air permeability to the fuel vapor pipe 57 can be ensured while maintaining the difficulty of diffusion of the fuel by the 29 and the regulation wall 77 .

Furthermore, in this embodiment, the collision wall portion 70 is provided separately from the case 15, and as shown in FIG. It indirectly supports the relief valve 65 via the spring 67 . As described above, the collision wall portion 70 is provided separately from the case 15 and serves as a support portion for supporting the relief valve 65. Therefore, the collision wall portion 70 for suppressing diffusion of the fuel serves as a relief valve. Since it also serves as a member for supporting the valve 65, there is no need to separately provide a member for supporting the relief valve 65 in the ventilation chamber R, so that the number of parts can be reduced and the structure can be simplified.

6 and 7 show another embodiment of the valve device according to the invention. In addition, the same code|symbol is attached|subjected to the substantially same part as the said embodiment, and the description is abbreviate|omitted.

The valve device 10A of this embodiment differs from the above embodiment in the structure of the collision wall portion. That is, as shown in FIG. 7, the collision wall portion 70A in this embodiment extends downward from its longitudinal tip and faces the opening 77a of the semi-cylindrical restricting wall 77. A canopy 80 is provided. The tip surface 80a of the eaves portion 80 in the downward extending direction has the largest amount of downward protrusion at the central portion in the width direction (direction orthogonal to the longitudinal direction) of the collision wall portion 70A. It has a curved shape in which the amount of downward protrusion gradually decreases toward both sides in the width direction of the . The eaves 80 is arranged at a position facing the air vent 57a of the fuel vapor pipe 57, as shown in FIG. there is

In the valve device 10A of this embodiment, the impact wall portion 70A is connected to the case 15, and the cover 50 is attached to the case 15. As shown in FIG. The provided eaves portion 80 can narrow the gap from the partition wall 23 side, here the gap between the upper end face of the rib 29 and the eaves portion 80 . As a result, even if the fuel ejected from the first valve hole 27 and collides with the collision wall portion 70A is to diffuse toward the fuel vapor pipe 57, it can easily collide with the eaves portion 80. can be made difficult to pass through the gap with the upper end surface of the fuel vapor pipe 57, the inflow of fuel into the fuel vapor pipe 57 can be more effectively suppressed.

FIG. 8 shows yet another embodiment of the valve device according to the invention. In addition, the same code|symbol is attached|subjected to the substantially same part as the said embodiment, and the description is abbreviate|omitted.

The valve device 10B of this embodiment differs from the previous embodiment in the structure of the collision wall portion. That is, as shown in FIG. 8, the collision wall portion 70B in this embodiment has an inclined shape so that the distance from the partition wall 23 gradually narrows from the base end side toward the tip end side in the longitudinal direction. None.

In the valve device 10B of this embodiment, the collision wall portion 70B is connected to the case 15, and the cover 50 is attached to the case 15. By 70B, the gap between the tip of the collision wall portion 70B and the upper end surface of the rib 29, which is the wall portion on the partition wall 23 side, can be narrowed. As a result, even if the fuel ejected from the first valve hole 27 and collided with the impingement wall portion 70B spreads toward the fuel vapor pipe 57, it does not pass through the gap between the impingement wall portion 70B and the upper end surface of the rib 29. Therefore, the inflow of fuel into the fuel vapor pipe 57 can be suppressed more effectively.

In the valve device described above, the float valve 60 closes the first valve hole 27 when the liquid level in the fuel tank rises abnormally due to fuel swings or the like, thereby causing fuel to leak out. When the liquid level in the fuel tank reaches the set full tank liquid level, the first valve hole 27 is closed to prevent further supercharging. It may be a so-called full-tank regulation valve, which prevents it, and is not particularly limited.

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. .

When the valve device was set in the fuel tank and a rocking test was performed, it was tested how much fuel leaked from the opening.

(Example)
A valve device of an embodiment was manufactured, which includes a case, a float valve, etc. similar to the valve device shown in FIGS.

(Comparative example)
A comparative valve device was manufactured which had the same structure as the above example except that it did not have an impingement wall.

(Test method)
The valve devices of the above Examples and Comparative Examples were mounted in the fuel tank 1 filled with fuel, and rotated in the following cycles by an inclination test device (not shown).

As shown in FIG. 9(a), the valve device of the embodiment or the comparative example is attached to the fuel tank 1, air is blown into the fuel tank 1 at 2 L/min, and the inside of the fuel tank 1 is maintained at 10 kPa. First, rotate the fuel tank 1 counterclockwise so that the fuel tank 1 is tilted 42° with respect to the fuel surface (see FIG. 9B), then rotate clockwise to return the fuel surface to a horizontal level. , rotate the fuel tank 1 so that the fuel tank 1 is tilted at −42° with respect to the fuel liquid level, and then rotate it counterclockwise to return the fuel liquid level to the horizontal level (this is regarded as one cycle). . This one cycle operation was performed in 11 seconds, and this was repeated for 100 cycles (about 18 minutes). Also, this operation was performed twice for each of the valve devices of the example and the comparative example, and the amount of fuel leaked from the first valve hole was measured. The results are shown in Table 1 below.

As a result, it was confirmed that the valve device of the example had a smaller amount of fuel leakage from the first valve hole than the valve device of the comparative example, and that the collision wall portion contributed to the fuel leakage.

1 Fuel tank 10, 10A, 10B Valve device 15 Case 20 Case main body 23 Partition wall 26 Upper wall 27 First valve hole 29 Rib 32 Second valve hole 40 Cap 50 Cover 53 Ceiling wall 57 Fuel vapor pipe 58 Seal ring 60 Float valve 63 First spring 65 Relief valve 67 Second springs 70, 70A, 70B Collision wall portion 77 Regulation wall 79 Relief valve support portion R Ventilation chamber V Valve chamber

Claims (6)

a case having, above, a partition wall in which a first valve hole is formed, and provided with a valve chamber communicating with a fuel tank below the partition wall;
a cover mounted above the case to provide a ventilation chamber between the partition wall;
a fuel vapor pipe provided in the cover or the case and communicating with the ventilation chamber;
a float valve that is housed in the valve chamber so as to be able to move up and down and opens and closes the first valve hole;
a collision wall portion connected to the case and disposed in the ventilation chamber above the partition wall so as to face the first valve hole;
The cover has a ceiling wall, and the collision wall portion is arranged below the ceiling wall with a predetermined gap therebetween,
a rib that at least partially surrounds the circumference of the first valve hole is provided on a surface of the partition wall facing the collision wall,
A valve device, wherein the distance between the collision wall portion and the upper end of the rib is larger than the predetermined clearance. a case having, above, a partition wall in which a first valve hole is formed, and provided with a valve chamber communicating with a fuel tank below the partition wall;
a cover mounted above the case to provide a ventilation chamber between the partition wall;
a fuel vapor pipe provided in the cover or the case and communicating with the ventilation chamber;
a float valve that is housed in the valve chamber so as to be able to move up and down and opens and closes the first valve hole;
a collision wall portion connected to the case and disposed in the ventilation chamber above the partition wall so as to face the first valve hole;
a rib that at least partially surrounds the circumference of the first valve hole is provided on a surface of the partition wall facing the collision wall,
In the collision wall portion, a regulation wall extending downward from a surface facing the partition wall and axially overlapping the rib is provided at a position closer to the first valve hole than the rib. cage,
The valve device according to claim 1, wherein the restricting wall has a semi-cylindrical shape, a U-frame shape, or a V-shaped frame shape with an opening on the fuel vapor pipe side. 2. A valve device according to claim 1, wherein said restricting wall has a semi-cylindrical shape with an opening on the side of said fuel vapor pipe. a case having, above, a partition wall in which a first valve hole is formed, and provided with a valve chamber communicating with a fuel tank below the partition wall;
a cover mounted above the case to provide a ventilation chamber between the partition wall;
a fuel vapor pipe provided in the cover or the case and communicating with the ventilation chamber;
a float valve that is housed in the valve chamber so as to be able to move up and down and opens and closes the first valve hole;
a collision wall portion connected to the case and disposed in the ventilation chamber above the partition wall so as to face the first valve hole;
The cover has a ceiling wall, and the collision wall portion is arranged below the ceiling wall with a predetermined gap therebetween,
A valve device according to claim 1, wherein the impact wall portion extends in a long plate shape, and a canopy portion is provided downward from a longitudinal tip of the impact wall portion. a case having, above, a partition wall in which a first valve hole is formed, and provided with a valve chamber communicating with a fuel tank below the partition wall;
a cover mounted above the case to provide a ventilation chamber between the partition wall;
a fuel vapor pipe provided in the cover or the case and communicating with the ventilation chamber;
a float valve that is housed in the valve chamber so as to be able to move up and down and opens and closes the first valve hole;
a collision wall portion connected to the case and disposed in the ventilation chamber above the partition wall so as to face the first valve hole;
The cover has a ceiling wall, and the collision wall portion is arranged below the ceiling wall with a predetermined gap therebetween,
The collision wall portion extends in the shape of a long plate, and has an inclined shape so that the distance from the partition wall gradually narrows from the base end side toward the tip end side in the longitudinal direction. A valve device characterized by: a second valve hole communicating between the valve chamber and the ventilation chamber is formed in the partition wall;
A relief valve for opening and closing the second valve hole is arranged on the partition wall on the ventilation chamber side,
The valve device according to any one of claims 1 to 5, wherein the collision wall portion is provided separately from the case and forms a support portion for supporting the relief valve.

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