KR102591385B1 - Valve device for fuel tank - Google Patents

Abstract

A valve device for a fuel tank that can achieve miniaturization of the valve device and suppress fuel leakage to the outside of the fuel tank is provided. This valve device 10 for a fuel tank has a housing 15 in which a valve seat 24 is formed, a float body 50, and a valve body 70, and the float body 50 includes a peripheral wall 51 and It has a ceiling wall 52, and a cavity K is formed inside the ceiling wall 52. A through hole 54 communicating with the cavity K is formed in the ceiling wall 52, and a valve body 70 is provided. A tiltable support portion 53 is formed, and the valve body 70 includes a seal portion 71 that contacts or separates from the valve seat 24, and a seal portion 71 that engages the float body 50. It has engaging leg portions 74 and 75, and the engaging leg portions 74 and 75 extend to be inserted into the through hole 54 of the ceiling wall 52 and are configured to engage inside the through hole 54. do.

Description

Valve device for fuel tank {VALVE DEVICE FOR FUEL TANK}

The present invention relates to a fuel tank valve device installed in a fuel tank of an automobile or the like and used as a fuel leak prevention valve or full fill regulation valve.

For example, a car's fuel tank may have a fuel spill prevention valve that prevents the fuel inside the fuel tank from leaking out of the fuel tank when the car turns or tilts, or prevents the liquid level in the fuel tank from rising above the preset full level. A full-fill regulation valve is installed to prevent excessive refueling into the fuel tank.

As a conventional product of this type, Patent Document 1 below includes a tubular case having a storage chamber, and a float valve provided with a valve body at the upper portion stored in the storage chamber, and the valve body and the float body are connected to the central axis of movement of the float body. A valve device for a fuel tank is described which has an assembled structure that allows movement of the valve body in the following direction and also separates the seated valve body when the float body is lowered.

The float body has a main body having a substantially cylindrical shape and a head protruding from the top of the main part, and the head is composed of a shaft part protruding from the top of the main part and a wheel flange part connected to the tip of the float body. Additionally, a gap for inserting a spring is formed inside the main body, and at the same time, a through hole is formed on the ceiling surface of the main body, which is in communication with the gap and allows fuel, vapor, etc. in the tank to flow out. On the other hand, the valve body has a disk shape and has a plurality of legs protruding downward from its periphery, and a locking claw is formed protruding from the inside of the tip of a certain leg portion. Then, a plurality of leg portions of the valve body are arranged on the outer periphery of the wheel flange portion of the head of the float body, and the locking claws on the inside of the leg portion are fitted to the inside of the wheel flange portion, thereby allowing the valve body to move up and down in the float body. It is designed to be assembled in one state.

[Patent Document 1] Japanese Patent No. 4990020 Publication

In the case of the above device, since the wheel flange portion on which the locking claw of the valve body engages is formed on the upper part of the float body, the axial height of the float body and the valve body increases, making it easy for the valve device to be enlarged. In addition, since a through hole is formed in the ceiling surface of the float body, there is a risk that the fuel may surge out of the through hole and leak to the outside of the fuel tank through the valve seat when the fuel is violently shaken within the fuel tank. there is.

Therefore, an object of the present invention is to provide a valve device for a fuel tank that can achieve miniaturization of the valve device and at the same time suppress fuel leakage to the outside of the fuel tank.

In order to achieve the above object, the fuel tank valve device of the present invention is provided with a valve chamber at the lower part and a ventilation chamber at the upper part with a partition wall in between, and an opening for communicating the valve chamber and the ventilation chamber through the partition wall. It has a housing in which a valve seat is formed around the opening, a float body disposed to be capable of being raised and lowered in a valve chamber of the housing, and a valve body mounted on the float body, wherein the float body has a peripheral wall and a circumference of the peripheral wall. It has a ceiling wall disposed on an upper part of the wall, a cavity is formed therein, a through hole communicating with the cavity is formed in the ceiling wall, and a support portion is formed to tiltably support the valve body, and the valve The sieve has a sealing portion that contacts or separates from the valve seat to open and close the opening, and an engaging leg portion that engages the sealing portion with the float body, and the engaging leg portion extends to be inserted into a through hole of the ceiling wall, It is characterized by being configured to engage inside the through hole.

In the fuel tank valve device of the present invention, it is preferable that an engaging tank protruding toward the outer diameter side of the peripheral wall is formed on the side surface of the engaging leg portion.

In the fuel tank valve device of the present invention, the peripheral wall of the float body has an outer peripheral wall and an inner peripheral wall arranged concentrically inside the outer peripheral wall, and the outer peripheral wall and the inner peripheral wall are located inside the ceiling wall. A plurality of ribs connecting the inner circumferential walls are formed, inside the cavity, and an air chamber is formed between the outer circumferential wall, the inner circumferential wall, and the adjacent ribs, and when the float body is viewed in the axial direction, The air chamber is disposed at a position that does not overlap in the circumferential direction with respect to the through hole, and the inner circumferential wall includes a space formed outside the inner circumferential wall at a position that overlaps in the circumferential direction with respect to the through hole, and an inner side of the inner circumferential wall. It is preferable that slits are formed to communicate the spaces formed in .

In the fuel tank valve device of the present invention, the peripheral wall of the float body has an outer peripheral wall and an inner peripheral wall concentrically disposed inside the outer peripheral wall, and the outer peripheral wall and the inner peripheral wall are located inside the ceiling wall. A plurality of ribs connecting the circumferential walls are formed, inside the cavity, and an air chamber is formed between the outer circumferential wall, the inner circumferential wall, and the adjacent ribs, and when the float body is viewed in the axial direction, the air The seal is disposed at a position that does not overlap in the circumferential direction with respect to the through hole, and the end of the plurality of ribs on the opposite side from the ceiling wall is formed to be located closer to the ceiling wall than the lower end of the circumferential wall, and the end It is preferable that it forms a contact part of the spring for pressing the float body.

According to the present invention, the engagement leg portion of the valve body is inserted into the through hole of the ceiling wall of the float body and engages into it, so that the valve body is engaged with the float body, and thus penetrates through the engagement leg portion inserted into the through hole. Not only does it make it difficult for fuel to leak from the ball, making it difficult to leak outside the fuel tank, but also the engagement leg extends through the ceiling wall of the float body, making it possible to reduce the height direction of the float body and valve body. It can be formed and miniaturization of the entire device can be achieved.

1 is an exploded perspective view showing an embodiment of the fuel tank valve device of the present invention;
2 is a cross-sectional view of the fuel tank valve device of the present invention;
3 is a perspective view of a float body constituting the fuel tank valve device of the present invention;
4 is a cross-sectional view of the float body;
5 is a bottom view of the float body;
Figure 6 is a cross-sectional perspective view of the float body;
Figure 7 shows a valve body constituting the fuel tank valve device of the present invention, (a) is a perspective view thereof, (b) is a perspective view when viewed from a direction different from (a),
8 is a cross-sectional view of the fuel tank valve device of the present invention with the float body raised, and
Figure 9 is a cross-sectional view of the fuel tank valve device of the present invention with the valve body tilted.

Hereinafter, with reference to FIGS. 1 to 9, an embodiment of the fuel tank valve device of the present invention will be described. Additionally, in the following description, “fuel” means liquid fuel (including fuel spray), and “fuel vapor” means evaporated fuel.

As shown in Figs. 1 and 2, this fuel tank valve device 10 (hereinafter referred to as “valve device 10”) includes a housing body 20 having a substantially tubular shape with a partition wall 22 provided at the upper side; It has a housing (15) consisting of an upper cap (30) disposed above the housing body (20) and a lower cap (40) mounted on the lower part of the housing body (20).

As shown in FIG. 2, by attaching the lower cap 40 to the lower part of the housing main body 20, a valve chamber (not shown) is formed at the lower part of the partition wall 22, which communicates with a fuel tank (not shown). V) is formed, and by disposing the upper cap 30 above the housing main body 20, a ventilation chamber R communicating to the outside of the fuel tank is formed above it with the partition wall 22 in between. .

Additionally, this valve device 10 has a float body 50 arranged to be capable of being raised and lowered in the valve chamber V of the housing 15, and a valve body 70 mounted on the float body 50.

The housing main body 20 has a substantially cylindrical shape with an open bottom, and has a peripheral wall 21 in which a through hole 21a is formed. A sealing ring 28 is attached to the upper outer periphery of this peripheral wall 21, thereby improving the sealing performance of the cover member 45 shown in FIG. 2.

Additionally, a circular opening 23 is formed in the center of the partition wall 22 formed in the upper part of the housing main body 20, and a valve seat 24 protrudes from the inner edge (see Fig. 2).

Also, as shown in FIG. 2, a communication port 25 communicating with the valve chamber V and the ventilation chamber R is formed on the outer periphery of the opening 23 of the partition wall 22. In addition, from the upper surface of the partition wall 22, a valve receiving wall 26 is erected to surround the opening 23 and the communication port 25 and is shaped as if two tubular walls with different outer diameters are installed in succession. do. An upper cap 30 provided with a through hole 30a is mounted on the upper opening of the valve receiving wall 26.

Additionally, within the ventilation chamber R, a check valve 35 having a negative pressure valve 35a is accommodated on the upper side of the opening 23. This check valve 35 is always pressed downward by the spring 35b, abuts against the upper peripheral part of the opening 23, and closes the opening 23. Then, when the pressure in the fuel tank rises, this check valve 35 rises against the pressing force of the spring 35b, opens the opening 23, and discharges the fuel vapor out of the fuel tank, while the pressure in the fuel tank increases. When lowered, the negative pressure valve 35a opens, allowing outside air to flow into the fuel tank.

Additionally, within the ventilation chamber R, a relief valve 37 is accommodated at the upper part of the communication port 25. This relief valve 37 always closes the upper opening of the communication port 25 through a spring 37a, and in a state where the valve body 70 is in contact with the valve seat 24 to close the opening 23 (State in FIG. 8), when the pressure in the fuel tank rises, it is pushed up against the pressing force of the spring 37a, opening the communication port 25, and allowing the fuel vapor to escape out of the fuel tank. Additionally, the relief valve 37 and the check valve 35 do not need to be disposed.

Additionally, as shown in FIG. 2, a cover member 45 having a fuel vapor pipe 46 (hereinafter referred to as “piping 46”) is mounted above the housing main body 20. In addition, the pipe 46 communicates with the ventilation chamber R through a fuel vapor outlet (not shown), and a tube (not shown) is connected to the outer periphery of the pipe 46, which communicates with a container disposed outside the fuel tank.

In addition, the lower cap 40 mounted on the lower part of the housing body 20 has a through hole 40a communicating with the valve chamber V at the bottom thereof (see FIGS. 1 and 2). Also, a spring 69 that presses the float 50 is placed on the lower cap 40, and the float 50 is placed on the lower cap 40 through the spring 69.

Next, with reference to FIGS. 3 to 6, the float body 50 will be described.

This float body 50 has a circumferential wall 51 and a ceiling wall 52 disposed above the circumferential wall 51, and has a substantially tubular shape that is open at the bottom and closed at the top, and has a cavity inside the float body 50. Part K (see FIG. 4) is formed.

The ceiling wall 52 has a substantially disk shape, and a support portion 53 having a rounded tip and a mountain-like protrusion protrudes from the center of the upper surface. This support portion 53 is a portion that supports the mortar-shaped support portion 73 (see FIGS. 2 and 7(b)) of the valve body 70, which will be described later, so as to tilt the valve body 70. In addition, it is sufficient as a support part to support the valve body in a tiltable manner with respect to the float body. For example, it may be formed into a hemispherical protruding shape, or a protrusion may be provided on the valve body side, and the protrusion may be provided on the float body side. A support portion having a concave shape may be provided to accommodate the support, and there is no particular limitation.

In addition, a pair of horn-shaped through holes 54 and 54 communicating with the cavity K are formed on the outer periphery of the support portion 53 of the ceiling wall 52 and at positions opposite to each other in the circumferential direction. As shown in FIG. 5, this pair of through holes 54,54 are located in a space K1 formed on the outside of the inner circumferential wall 59, which will be described later, among the cavity K, and on the inner side of the inner circumferential wall 59. Each is connected to the space K2 formed in . In addition, the through hole may be a circular hole or an oval hole, and the shape is not limited, and the number is not particularly limited. Additionally, a plurality of arc-shaped walls 55 are erected at predetermined intervals on the outer circumference of the ceiling wall 52.

In addition, the peripheral wall 51 of this embodiment has a substantially tubular shape, an outer peripheral wall 57 whose upper end is connected to the peripheral part of the ceiling wall 52, and an outer peripheral wall 57 inside the outer peripheral wall 57. An inner circumferential wall 59 arranged concentrically with respect to (57) and having a substantially tubular shape whose upper end is connected to the inside of the ceiling wall 52, is inside the inner circumferential wall 59, and an outer circumferential wall 57 ) and an approximately tubular wall 61 disposed concentrically with respect to the inner circumferential wall 59, the upper end of which is connected to the inner central portion of the ceiling wall 52, and has a multi-cylindrical shape (here, a triple cylindrical wall 61). cylindrical). In addition, the circumferential wall 51 may be a single wall, a double cylindrical shape of an outer and an inner wall, or three or more multiple tubular shapes. If a cavity can be formed in relation to the ceiling wall, the circumferential wall 51 may have a shape or shape. The structure is not particularly limited.

Also, as shown in FIGS. 3 and 5, the inner surface side of the inner circumferential wall 59 and the outer surface side of the cylindrical wall 61 disposed inside the inner circumferential wall are a plurality of plates arranged at equal intervals in the circumferential direction. They are connected by connecting walls 63 (here four). The upper end of this connecting wall portion (63) is connected to the inside of the ceiling wall (52).

As shown in Fig. 4, the connecting wall portion 63, the inner circumferential wall 59, and the cylindrical wall 61 are formed to have the same length at their lower ends. On the other hand, thin rib-shaped protrusions 57a protrude from the lower end of the outer circumferential wall 57 at even intervals in the circumferential direction (see Fig. 4) and extend longer than the inner circumferential wall 59, etc. (Fig. 4). The protrusion 57a is a portion that reduces the contact area with the bottom of the lower cap 40 and prevents the floats 50 from sticking together.

A ring-shaped space K1 is formed on the outside of the inner circumferential wall 59, and a plurality of arc-shaped spaces K2 partitioned by the connecting wall portion 63 are formed on the inside of the inner circumferential wall 59. is formed In addition, a first air chamber (K3) is formed inside the cylindrical wall (61) to contain air and increase buoyancy, and at the same time, the upper end of the first air chamber (K3) extends beyond the ceiling wall (52). It extends to reach the inside of the support part 53 (see Figure 4).

In addition, a plurality of guide ribs 57b extending along the axial direction are formed on the outer circumference of the outer circumferential wall 57 at equal intervals in the circumferential direction, and these are formed on the outer circumference of the outer wall 21 of the housing main body 20. It is disposed close to the inner surface and serves as a guide during the lifting and lowering operation of the float body 50.

In addition, inside the ceiling wall 52, ribs 65 connecting the upper end of the outer circumferential wall 57 and the upper end of the inner circumferential wall 59 are spaced at predetermined intervals so as to be radial with respect to the axis of the float body 50. It protrudes in plural numbers (see Figures 5 and 6). These plurality of ribs 65 are formed shorter than the lower ends of any wall portion of the outer circumferential wall 57, inner circumferential wall 59, and cylindrical wall 61 constituting the circumferential wall 51 (see FIG. 4 ), the end of the rib 65 opposite to the ceiling wall 52 forms a contact portion of the spring 69 for pressing the float body 50 (see FIG. 2).

Additionally, a plurality of slits 67 are formed on the inner circumferential wall 59 at uniform intervals in the circumferential direction and extending along the axial direction from the lower end to the upper end of the inner circumferential wall 59. Here, four slits 67 are formed radially with respect to the axis of the float body 50 (see Fig. 5). Through this slit 67, the outer space K1 of the inner circumferential wall 59 and the inner space K2 of the inner circumferential wall 59 communicate with each other. Additionally, the slits may have a shape extending from the lower end of the inner peripheral wall 59 to a predetermined position in the axial direction, and the number of slits is not particularly limited.

It is also inside the cavity K formed in the peripheral wall 51 and the ceiling wall 52, and between the outer peripheral wall 57, the inner peripheral wall 59, and the ribs 65 and 65 adjacent in the circumferential direction. A second air chamber K4 is formed to collect air (see FIGS. 5 and 6). This second air chamber K4 constitutes the “air chamber” in the present invention. In this embodiment, as shown in FIG. 5, the position coincides with the plurality of connecting wall portions 63, and a plurality of ( Here, 4) second air chambers K4 are formed (slits; if there are 67, it cannot be an air chamber where air collects).

Also, as shown in FIG. 5, when the float body 50 is viewed in the axial direction, the second air chamber K4 is disposed at a position that does not overlap the pair of through holes 54 and 54 in the circumferential direction. At the same time, among the plurality of slits 67 formed on the inner circumferential wall 59, a pair of slits 67 and 67 arranged oppositely in the circumferential direction are circumferentially formed with respect to the pair of through holes 54 and 54. They are placed in positions that overlap in each direction.

Next, with reference to FIG. 7, the valve body 70 mounted on the float body 50 will be described.

The valve body 70 of this embodiment includes a sealing portion 71 that is in contact with or separated from the valve seat 24 to open and close the opening 23, and this sealing portion 71 is engaged with the float body 50. It has a pair of engaging leg portions 74 and 75.

As shown in FIG. 7(a), the sealing portion 71 in this embodiment is sized to cover a pair of through holes 54, 54 formed in the ceiling wall 52 of the float body 50. It has a substantially disk shape, and a support portion 73 with an inner surface having a mortar shape is installed at the inner central portion of the sealing portion 71 (see Fig. 7(b)). This support portion 73 is placed on the rounded tip of the support portion 53 to rotatably support the valve body 70 with respect to the float body 50.

Additionally, an elastic sealing member made of rubber and an elastic resin material may be disposed on the upper surface side of the sealing portion 71, and the term “sealing portion” in the present invention includes such an elastic sealing member.

Additionally, a pair of engaging leg portions 74 and 75 of different lengths extend from opposing portions inside the sealing portion 71. As shown in FIG. 2 , the engaging leg portion 74 extends longer than the engaging leg portion 75 . In addition, each engaging leg portion 74, 75 extends from the back side of the sealing portion 71 and includes a bendable extension portion 77 inserted into the through hole 54 of the ceiling wall 52, and this extension portion ( Each has an engaging tank 78 protruding from the outer surface of the distal end side of 77) toward the outer diameter side of the through hole 54. Each engagement tank 78 is arranged inside the through hole 54 and can be engaged with the peripheral portion 54a on the outer diameter side inside the through hole 54 (see Fig. 2). Additionally, a tapered surface 78a is formed on the outer surface of the engaging tank 78 whose protruding height gradually decreases toward the tip of the engaging leg, making it easy to insert into the through hole 54 and easily protruded from the inside.

Then, as shown in FIG. 2, the pair of engagement legs 74 and 75 of the valve body 70 are inserted from the outside of the through holes 54 and 54 of the ceiling wall 52, thereby forming the engagement legs. The extension portions (77,77) of (74,75) are inserted into the through holes (54,54), and the engaging jaws (78,78) are disposed so that they can be coupled to the inner edges of the through holes (54,54). , Accordingly, the valve body 70 is mounted on the float body 50 to prevent it from falling off.

Additionally, in this embodiment, as described above, since the sealing portion 71 of the valve body 70 is tiltably supported by the support portion 53 of the float body 50 through the support portion 73, In this case, the engaging jaws 78 and 78 of the engaging legs 74 and 75 do not engage inside the through holes 54 and 54 (see FIG. 2), but the sealing portion 71 is attached to the valve seat 24. After contact, the float body 50 descends and engages with the inside of the through hole 54, such as when the valve body 70 is tilted (see FIG. 9). That is, in the present invention, the engaging leg portion is engaged with the inside of the through hole in a normal state (a state in which the float body is not immersed in fuel), and even when the engaging leg portion is not engaged with the inside of the through hole, it penetrates the valve body when tilting. This means that it includes cases where it can engage the inside of the ball.

In addition, in this embodiment, the housing 15, float body 50, and valve body 70 are formed of synthetic resin, such as polyacetal (POM) and polyamide (PA), depending on the material. , when fuel adheres or is immersed, it may have the property of expanding due to the fuel. At this time, the through hole 54 formed in the ceiling wall 52 of the float 50 expands so that its inner diameter increases (see imaginary line in FIG. 2). On the other hand, as shown by arrow A1 in FIG. 2, the engaging leg portions 74 and 75 of the valve body 70 expand outward so as to spread in a 'ハ' shape. At this time, since the engaging leg portions 74 and 75 have a thin leg shape, the amount of expansion to the outside of the engaging leg portions 74 and 75 is greater than the amount of expansion of the inner diameter of the through hole 54.

The float body 50 equipped with the valve body 70 is placed on the lower cap 40 with the spring 69 compressed. Then, when the fuel liquid level rises and is immersed in the fuel F above a predetermined height, the buoyancy of the float body 50 itself is added to the pressing force of the spring 69, and the float body 50 rises to seal the valve body 70. The portion 71 comes into contact with the valve seat 24 of the partition wall 22, thereby closing the opening 23 (see Fig. 8). Afterwards, when the fuel liquid level falls and the buoyancy force does not act on the float body 50, the float body 50 descends under its own weight, and the valve body is placed inside the through hole 54 of the float body 50. Since the engagement finger 78 of the short engagement leg portion 75 of (70) engages and the short engagement leg portion 74 is pulled downward (see arrow A3 in FIG. 9), the valve is moved through the support portion 53. As the sieve 70 tilts, the sealing portion 71 is tilted relative to the valve seat 24, creating a gap between the valve seat 24 and the sealing portion 71 (see Fig. 9).

In addition, the valve device 10 in this embodiment closes the opening 23 by contacting the valve seat 24 when the liquid level in the fuel tank rises abnormally due to the fluctuation of the fuel or the like. And, when applied as a so-called fuel leak prevention valve that prevents external leakage of fuel, or when the liquid level in the fuel tank reaches the set full liquid level, the float body 50 rises and comes into contact with the valve seat 24. It may be applied as a so-called fullness regulation valve that closes the opening 23 and prevents further excess oil supply, and is not particularly limited.

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

First, a method of assembling the valve body 70 to the float body 50 will be described. That is, as shown in FIG. 1, the pair of engagement legs 74, 75 of the valve body 70 are aligned with the pair of through holes 54, 54 of the float body 50, and the float body ( The valve body 70 is pushed out from the outside of the ceiling wall 52 of the valve body 50. Then, the engaging tank 78 is pressed through the tapered surface 78a on the inner periphery of the through hole 54, and the pair of engaging leg portions 74 and 75 are pushed inward, and the uppermost part of the engaging tank 78 ( When the outer most protruding portion) exits from the inside of the through hole 54, the pair of engaging leg portions 74 and 75 elastically return, and the engaging members 78 and 78 are moved through the through hole 54 and 54. ), and at the same time, the support portion 53 of the float body 50 abuts against the support portion 73 of the valve body 70 and is supported so as to be tiltable. In this way, the valve body 70 can be prevented from falling off with respect to the float body 50 and can be mounted so as to be tiltable via the support portion 53.

As shown in FIG. 2, in a state where the fuel liquid level in the fuel tank does not rise and the float body 50 is not immersed in the fuel, the opening 23 formed in the partition wall 22 is opened and this partition is opened. The communication port 25 provided in the wall 22 is closed by the relief valve 37.

In the above state, when the vehicle turns or tilts significantly and the fuel liquid level in the fuel tank rises, the fuel flows into the valve chamber (V) through the through hole (40a) of the lower cap (40) or through hole (21a) of the housing body (20). When the fuel flows into the float body 50 above a predetermined height, the float body 50 rises due to the buoyancy of the spring 69 and the float body 50 itself, and as shown in FIG. 8, the valve Since the sealing portion 71 of the sieve 70 comes into contact with the valve seat 24 and closes the opening 23, the fuel is prevented from flowing into the ventilation chamber R through the opening 23, thereby preventing the fuel from flowing into the ventilation chamber R through the opening 23. Fuel leakage outside the tank can be prevented.

In addition, when this valve device 10 is used as a fullness regulation valve, a pair of through holes 54 and 54 are formed in the ceiling wall 52 of the float body 50, so that the float body 50 By allowing the air flowing into the cavity (K) to flow out from the through hole (54), the floating timing of the float body (50) can be delayed, and the position of the so-called locking point (the position that defines the amount of fuel filling) can be raised higher. You can set it.

However, the float body 50 of this valve device 10 has a cavity K inside the ceiling wall 52, and a cavity K in the ceiling wall 52; here, the space outside the inner peripheral wall 59 ( A through hole 54 is formed that communicates with K1) and the inner space K2 of the inner circumferential wall 59. Therefore, when the vehicle drives on a rough road and vibrates up and down, shakes left and right, or makes a sharp turn, fuel is lost. There are cases where it erupts from the through hole 54 and flows out through the space K1 or K2 of the float body 50.

Even in this case, in this valve device 10, as described above, the pair of engagement legs 74, 75 of the valve body 70 are connected to the pair of engagement legs 74 and 75 of the ceiling wall 52 of the float body 50. Since the valve body 70 is mounted on the float body 50 by being inserted into the through holes 54 and 54 and engaging with the inner peripheral portions 54a and 54a, respectively, it is inserted into the through holes 54 and 54. The engagement legs 74 and 75 make it difficult for fuel to flow out of the through holes 54 and 54, and as a result, the fuel flows into the opening 23 of the partition wall 22 or the ventilation chamber (R). ), leakage to the outside of the fuel tank can be suppressed through the pipe 46. Moreover, at the same time, the engaging leg portions 74 and 75 extend through the ceiling wall 52 of the float body 50 (see FIG. 2), so that the float body 50 and the valve body 70 The height direction of can be made small, making it possible to achieve overall miniaturization of the valve device 10.

In addition, since the sealing portion 71 of the valve body 70 is disposed on the upper part of the ceiling wall 52 of the float body 50 to cover the pair of through holes 54 and 54, the through hole 54 ) can be blocked from heading toward the opening 23 of the housing main body 20, thereby suppressing fuel leakage to the outside of the fuel tank.

Additionally, in this embodiment, since the engagement tank 78 protrudes from the side surfaces of the engagement legs 74 and 75 toward the outer diameter side of the through hole 54, fuel adheres to or is immersed in the valve body 70, When the valve body 70 expands and the pair of engagement legs 74 and 75 spread toward the outer diameter side of the pair of through holes 54 and 54, as shown by arrow A1 in FIG. 2, the through hole The engagement distance of the engaging tank 78 with respect to the peripheral portion 54a on the outer diameter side inside the (54) is increased, the bonding strength between the float body 50 and the valve body 70 is increased, and the float body 50 It can be difficult to escape from the valve body 70.

In addition, in this embodiment, as shown in FIGS. 5 and 6, it is inside the cavity K of the float body 50, and includes the outer circumferential wall 57, the inner circumferential wall 59, and the adjacent ribs 65, 65) Since the second air chamber K4 is formed between the two, the portion where air collects can be increased in the cavity K, and the buoyancy of the float body 50 is increased, so that the float body 50 ) can improve the responsiveness of.

In addition, as shown in FIG. 5, the inner peripheral wall 59 of the float body 50 has an outer space K1 of the inner peripheral wall 59 and an inner peripheral wall at a position that overlaps the through hole 54 in the circumferential direction. Since the slit 67 is formed to communicate the inner space K2 of (59) with each other, it flows into the valve chamber V and flows through the inner space K2 of the inner circumferential wall 59, and flows through the through hole ( Fuel about to flow out from 54) is diffused toward the outer space K1 of the inner peripheral wall 59 through the slit 67 (see arrow A2 in FIG. 6), and flow concentrated into the through hole 54 is suppressed. This can make it more difficult for fuel to flow out from the through hole 54.

In addition, in this embodiment, as shown in FIG. 6, inside the cavity K of the float body 50, a second air chamber K4 is formed between the outer circumferential wall 57 and the inner circumferential wall 59. ) is formed shorter than the lower end of the peripheral wall 51 of the float body 50; the outer peripheral wall 57, the inner peripheral wall 59, and the cylindrical wall 61, and is formed on the opposite side thereof. Since the end of forms the abutting portion of the spring 69 for pressing the float body 50, an air chamber can be formed within the cavity K while forming the abutting portion of the spring 69, thereby forming the valve. The device 10 can be more appropriately miniaturized.

However, the float body 50 rises due to a rise in the fuel liquid level, the sealing portion 71 of the valve body 70 comes into contact with the valve seat 24 and closes the opening 23, and then the fuel liquid level falls. When the float body 50 is in a state where buoyancy does not act, the float body 50 generally descends by its own weight. However, there are cases where the sealing portion 71 of the valve body 70 becomes stuck to the valve seat 24, making it difficult for the float body 50 to descend (referred to as sticking phenomenon, etc.).

In the valve device 10 of this embodiment, in a state where the sealing portion 71 of the valve body 70 is in contact with the valve seat 24, no buoyancy force acts on the float body 50, and the float body 50 When attempting to descend under its own weight, the engagement finger 78 of the short engagement leg portion 75 of the valve body 70 engages with the inside of the through hole 54 of the float body 50, and the short engagement leg portion 74 ) is pulled downward (see arrow A3 in Figure 9). Accordingly, as shown in FIG. 9, the valve body 70 tilts through the support portion 53, and the sealing portion 71 is tilted with respect to the valve seat 24, so that the valve seat 24 and the sealing portion ( Since a gap is created between the sealing portion 71 and the valve seat 24, the sealing portion 71 can be removed from the valve seat 24, and the float body 50 can be lowered smoothly.

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

10 Valve device for fuel tank (valve device)
15 housing
21 perimeter wall
22 Partition wall
23 opening
24 valve seat
50 float body
51 perimeter wall
52 ceiling wall
53 support
54 through hole
55 outer wall
59 Inner wall
65 ribs
67 slit
69 spring
70 valve body
71 seal
74,75 combined leg part
77 extension
78 gymnastics team
K joint department
K4 2nd air chamber (air chamber)
R Ventilation room
V valve room

Claims (4)

A housing having a valve chamber in the lower part and a ventilation chamber in the upper part with a partition wall in between, an opening for communicating the valve chamber and the ventilation chamber in the partition wall, and a valve seat formed around the opening;
a float body disposed to be capable of being raised and lowered within the valve chamber of the housing;
It has a valve body mounted on the float body,
The float body has a peripheral wall and a ceiling wall disposed on an upper part of the peripheral wall, and a cavity is formed therein,
A through hole communicating with the cavity is formed in the ceiling wall, and a support portion for tiltably supporting the valve body is formed,
The valve body has a seal portion that is in contact with or separate from the valve seat to open and close the opening, and an engaging leg portion that engages the seal portion with the float body,
The engaging leg portion is configured to extend to be inserted into the through hole of the ceiling wall and engage with the inside of the through hole,
The peripheral wall of the float body has an outer peripheral wall and an inner peripheral wall arranged concentrically inside the outer peripheral wall,
The inner circumferential wall is provided with a slit that communicates the space formed on the outer side of the inner circumferential wall and the space formed on the inner side of the inner circumferential wall with each other,
A valve device for a fuel tank, wherein when the float body is viewed in the axial direction, the through hole is arranged to overlap the slit in the circumferential and radial directions. According to paragraph 1,
A valve device for a fuel tank, wherein an engaging tank is formed on a side surface of the engaging leg portion and protrudes toward an outer diameter side of the peripheral wall. According to claim 1 or 2,
Inside the ceiling wall, a plurality of ribs are formed connecting the outer circumferential wall and the inner circumferential wall,
Inside the cavity, an air chamber is formed between the outer circumferential wall, the inner circumferential wall, and the adjacent ribs,
A valve device for a fuel tank, wherein when the float body is viewed in the axial direction, the air chamber is disposed at a position that does not overlap the through hole in the circumferential direction. According to claim 1 or 2,
The peripheral wall of the float body has an outer peripheral wall and an inner peripheral wall concentrically disposed inside the outer peripheral wall, and a plurality of ribs are formed inside the ceiling wall to connect the outer peripheral wall and the inner peripheral wall,
Inside the cavity, an air chamber is formed between the outer circumferential wall, the inner circumferential wall, and the adjacent ribs,
When the float body is viewed in the axial direction, the air chamber is disposed at a position that does not overlap in the circumferential direction with respect to the through hole, and the ends of the plurality of ribs on the opposite side from the ceiling wall are larger than the lower ends of the circumferential wall. A valve device for a fuel tank, characterized in that it is formed to be located close to the ceiling wall, and the end portion forms an abutting portion of a spring for pressing the float body.

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