JP7441339B2 - Full tank regulation valve - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fill-up regulating valve that enables additional refueling.

The fuel tank may be provided with a full tank control valve that detects when the tank is full when refueling and closes the valve to prevent overfilling.

This type of valve, for example, is disclosed in Patent Document 1 below, which includes a valve port that communicates between the inside and outside of the fuel tank, a valve chamber formed under the valve port, and a float that is arranged to be movable up and down within the valve chamber. The valve chamber has an open end located below a support section of the float that has a fluid passage section, and an orifice is formed in the support section, and a cutout formed in the valve chamber A valve device for a fuel tank is described in which an entrance of an orifice air passage communicating with an orifice is formed below a support part and above an open end.

Then, when fuel is filled into the fuel tank and the fuel level reaches the open end of the valve chamber, the float rises and closes the valve port, detecting the first full tank and stopping the fuel filling. will be stopped. After that, the pressure in the fuel tank decreases, the float descends, and the gas in the fuel tank flows through the orifice air passage, the orifice, and the valve port in sequence, causing the fuel liquid to reach the entrance of the orifice air passage. Additional lubrication is applied until surface level is reached.

JP2020-16210A

In the fuel tank valve device of Patent Document 1, when the tank internal pressure decreases and the float descends after the first full tank detection, the orifice may be blocked by the fuel in the valve chamber. . If additional refueling is performed in this case, gas will flow through the orifice blocked with fuel, which creates a large flow resistance and makes it difficult to perform additional refueling.

Therefore, an object of the present invention is to provide a full tank regulation valve that can quickly perform additional refueling after full tank regulation has been implemented.

In order to achieve the above object, the full tank regulation valve according to the present invention is provided with a valve chamber communicating with the inside of the fuel tank in the lower part and a ventilation chamber communicating with the outside of the fuel tank in the upper part through the partition wall. a housing having an opening formed in a wall to communicate the valve chamber and the ventilation chamber; a housing that is housed in the valve chamber so as to be movable up and down; a float valve that closes the opening when raised; a first communication hole formed in the lower part of the housing that communicates the inside of the fuel tank and the inside of the valve chamber with each other; and the first communication hole of the housing. a second communication hole formed further above the second communication hole of the housing and connecting the inside of the fuel tank and the valve chamber with each other; It has a third communication hole that communicates with the chamber, and a cylindrical part that communicates with the second communication hole, extends upward within the valve chamber, and has an opening above the second communication hole. The second communication hole allows the inside of the fuel tank and the inside of the valve chamber to communicate with each other through the cylindrical part, and when refueling, the fuel liquid level in the fuel tank rises and the When the first flow hole is submerged in liquid, the float valve rises and closes the opening to stop continuous refueling, and the fuel level in the fuel tank further rises due to additional refueling, and the second It is characterized in that the additional oil supply is stopped when the flow hole is submerged in liquid.

According to the present invention, when refueling the fuel tank, when the fuel level in the tank rises and the first flow hole is submerged, the fuel flows into the valve chamber and the fuel level in the valve chamber increases. The float valve rises and the opening in the partition wall closes. As a result, the tank internal pressure increases and continuous refueling stops. In this state, the air in the fuel tank flows into the valve chamber from the third communication hole, thereby lowering the fuel liquid level in the valve chamber, making additional refueling possible.

Then, when the fuel level in the tank further rises due to the additional refueling and the second flow hole is submerged, the additional refueling also stops, and therefore the refueling operation is completed. During this additional refueling, the gas in the fuel tank flows into the valve chamber from the second flow hole through the cylindrical part, so it is less susceptible to the hydraulic pressure of the fuel that has flowed into the valve chamber, and the gas in the fuel tank flows into the valve chamber. The oil can flow smoothly into the valve chamber, and additional oil can be supplied quickly.

FIG. 1 is an exploded perspective view showing one embodiment of a full tank regulation valve according to the present invention. FIG. 3 is a perspective view of a full tank regulation valve. 3 is a cross-sectional view taken along the line AA in FIG. 2. FIG. FIG. 4 is a cross-sectional view taken along the line BB in FIG. 3; FIG. 2 is an enlarged perspective view of a lower cap constituting the housing of the full tank regulation valve. FIG. 6 is an enlarged perspective view of the lower cap constituting the housing of the fill tank control valve, viewed from a direction different from that in FIG. 5; It is a top view of the lower cap which constitutes the housing of a full tank regulation valve. It is a bottom view of the lower cap which constitutes the housing of a full tank regulation valve. FIG. 2 is a cross-sectional explanatory view showing a first state of the full tank regulation valve when regulating the tank full tank and supplying additional fuel. 10 is an explanatory diagram showing the state of the surrounding area including the full tank regulation valve and the fuel tank to which the full tank regulation valve is attached in the state of FIG. 9. FIG. FIG. 7 is an explanatory cross-sectional view showing a second state of the full tank regulation valve when regulating the tank full tank and supplying additional fuel. FIG. 12 is an explanatory diagram showing the state of the surrounding area including the full tank regulation valve and the fuel tank to which the full tank regulation valve is attached in the state of FIG. 11; FIG. 7 is a cross-sectional explanatory view showing a third state of the full tank regulation valve when regulating the tank full tank and supplying additional fuel. FIG. 14 is an explanatory diagram showing the state of the surrounding area including the full tank regulation valve and the fuel tank to which the full tank regulation valve is attached in the state of FIG. 13; FIG. 7 is an explanatory cross-sectional view showing a fourth state of the full-tank regulation valve when regulating the full-tank and supplying additional fuel. FIG. 16 is an explanatory diagram showing the state of the surrounding area including the full tank regulation valve and the fuel tank to which the full tank regulation valve is attached in the state shown in FIG. 15; FIG. 7 is an explanatory cross-sectional view showing a fifth state of the full tank regulation valve when regulating the tank full tank and supplying additional fuel. FIG. 7 is a partially enlarged cross-sectional view showing a first modification of the cylindrical portion of the full-tank regulating valve. FIG. 7 is a partially enlarged cross-sectional view showing a second modification of the cylindrical portion in the full-tank regulating valve. It is a perspective view showing other embodiments of the full tank regulation valve concerning the present invention. FIG. 21 is a perspective view of the lower cap constituting the housing of the full tank control valve, viewed from a different direction from FIG. 20; FIG. 3 is a plan view of the lower cap of the full tank regulation valve. 21 is a cross-sectional view taken along arrow line DD in FIG. 20. FIG. 21 is a sectional view taken along the line EE in FIG. 20. FIG. FIG. 25 is an enlarged sectional view of the main part of FIG. 24;

(One embodiment of a full tank regulation valve)
EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, one embodiment of the full tank control valve based on this invention is described.

As shown in FIG. 10, the full tank regulation valve 10 is installed above the fuel tank 1. A fuel supply pipe 2 for supplying fuel extends obliquely upward from one side of the fuel tank 1, and a fuel supply port 2a is provided at the upper end of the fuel supply pipe 2. A refueling nozzle 9 is inserted into the refueling port 2a, and fuel is supplied into the fuel tank 1.

Further, a circulation tube 3 communicating with the fuel tank 1 is connected above the fuel supply pipe 2 . This circulation tube 3 returns the fuel vapor in the fuel tank 1 to the fuel supply pipe 2, as shown by the arrow in FIG. (to circulate steam), and to suppress entrainment of outside air from the fuel filler port 2a. Further, a fuel pump 4 is installed inside the fuel tank 1, and an engine 5 and a canister 6 are installed outside the fuel tank 1.

Further, the full tank regulation valve 10 is connected to the canister 6 via the vent tube 7. Furthermore, a drain tube 8 is connected to the canister 6. The air and fuel vapor in the fuel tank 1 are guided to the canister 6 through the vent tube 7, a part of the air is discharged through the drain tube 8, and the fuel vapor is adsorbed and retained by the canister 6. be done.

As shown in FIGS. 1 to 4, the full tank regulation valve 10 in this embodiment communicates downward into the fuel tank via a partition wall 21 in which a first opening 26 and a second opening 27 are formed. A housing 15 is provided with a first valve chamber V1, a second valve chamber V2, and a ventilation chamber R that communicates with the outside of the fuel tank above. A first float valve 80 closes the first opening 26 when the fuel tank reaches a preset full fuel level, and a first float valve 80 is housed in the second valve chamber V2 so as to be able to rise and fall, and the liquid level in the fuel tank is raised and lowered. When the second float valve 85 is raised to a predetermined height or higher, the second float valve 85 closes the second opening 27, the first bias spring S1 biases the first float valve 80, and the second float valve 85 is biased. It is mainly composed of a second biasing spring S2. Note that the first float valve 80 serves as a "float valve" in the present invention, and the first biasing spring S1 serves as a "biasing spring" in the present invention.

Further, the housing 15 of this embodiment includes a housing main body 20, a lower cap 40 mounted below the housing main body 20, and an upper cover 70 mounted above the housing main body 20.

Further, as shown in FIG. 4, the full tank regulation valve 10 includes a first communication hole 55 that is formed at the lower part of the housing 15, and that communicates the inside of the fuel tank 1 and the inside of the first valve chamber V1 with each other, and the housing 15. A second communication hole 63 formed above the first communication hole 55 and communicating the inside of the fuel tank 1 and the inside of the first valve chamber V1 with each other, and a second communication hole 63 formed above the second communication hole 63 of the housing 15. A third communication hole 33 which communicates between the inside of the fuel tank 1 and the inside of the first valve chamber V1 and a second communication hole 63 which extends upwardly within the first valve chamber V1 and which communicates with the second communication hole 63 and which communicates the inside of the fuel tank 1 and the inside of the first valve chamber V1 with each other. It has a cylindrical portion (second cylindrical portion 60) in which an opening 67 is provided above the two-flow hole 63.

In the following description, "fuel" means liquid fuel (including fuel droplets), and "fuel vapor" means evaporated fuel. In the following description, the fuel level in the fuel tank 1 will be referred to as "fuel level L1", and the fuel level in the valve chamber will be referred to as "fuel level L2" (see FIG. 11, etc.).

First, the housing body 20 will be explained with reference to FIGS. 1 to 3. The housing main body 20 has a substantially cylindrical shape with a partition wall 21 at the top and an open bottom. The housing body 20 also includes a peripheral wall 22 and a partition wall 23 that defines the inner space of the housing body 20 into a first valve chamber V1 and a second valve chamber V2 (see FIG. 3). The partition wall 21 is arranged above the peripheral wall 22. Furthermore, the peripheral wall 22 has a different outer shape from the first valve chamber forming wall 24 that forms the outer periphery of the first valve chamber V1, and forms the outer periphery of the second valve chamber V2. It has a second valve chamber forming wall 25 (see FIG. 2). In this embodiment, the first valve chamber forming wall 24 has a substantially semicircular shape, while the second valve chamber forming wall 25 has stepped portions 24a (see FIG. 2) has an irregular outer shape with a reduced diameter.

As shown in FIG. 1, a plurality of first locking claws 22a project from the lower side of the peripheral wall 22, and a plurality of second locking claws 22b project from the upper side.

The partition wall 21 is formed with an opening that communicates the valve chamber and the ventilation chamber R. In the case of this embodiment, a circular first opening 26 is formed at a predetermined location of the partition wall 21, and the first valve chamber V1 and the ventilation chamber R are communicated through this first opening 26. (See Figure 3). Further, as shown in FIG. 3, a second opening 27 having a smaller diameter than the first opening 26 is formed in the partition wall 21, and the second valve chamber V2 is opened through the second opening 27. and ventilation chamber R are communicated with each other.

Furthermore, a flange portion 28 projects from the upper outer periphery of the peripheral wall 22. A ring mounting groove 28a is formed inside this flange portion 28, and an annular seal ring 28b is mounted in this ring mounting groove 28a.

Further, on the front side of the partition wall 21, a cylindrical wall 29 with an upper opening protrudes from the periphery of the second opening 27. A cap 30 is attached to the upper opening of this cylindrical wall 29. As shown in FIG. 3, a pressure regulating valve 31 is housed inside these so as to be movable up and down, making it possible to regulate the pressure inside the fuel tank.

Further, as shown in FIG. 1, a third communication hole 33 is provided above the first valve chamber forming wall 24 constituting the peripheral wall 22, which allows the inside of the fuel tank 1 and the inside of the first valve chamber V1 to communicate with each other. ing.

The third communication hole 33 is arranged above the first communication hole 55 and the second communication hole 63, and is smaller than the first communication hole 55 and the second communication hole 63. This third flow hole 33 is designed to prevent the first flow hole 55, the second flow hole 63, and the opening 67 of the second cylindrical portion 60 from being submerged by the fuel, except when the vehicle rolls over or reverses. It is designed so that it is always maintained in a state where it is not submerged in liquid. Then, in a state where the third communication hole 33 is not submerged and the first communication hole 55 and the opening 67 of the second cylindrical portion 60 are submerged, the fuel liquid level L2 in the first valve chamber V1 is If the fuel level in the tank 1 is higher than the fuel level L1, the third communication hole 33 is configured to allow air in the fuel tank 1 to flow into the first valve chamber V1 (see the arrow in FIG. 11).

Note that the above-mentioned "state where the third communication hole 33 is not submerged in liquid" means a state where the third communication hole 33 is opened without being blocked by liquid fuel, and the inside of the fuel tank and the inside of the valve chamber are in communication. The term "submerged state" means a state in which the fuel tank is blocked by liquid fuel, and communication between the inside of the fuel tank and the inside of the valve chamber is cut off. These meanings also apply to the first communication hole 55, the second communication hole 63, and the opening 67 of the second cylindrical portion 60.

Next, the lower cap 40 attached below the housing body 20 will be explained with reference to FIGS. 3 to 8.

The lower cap 40 constituting the housing 15 has a bottomed cap shape that is open at the top and has a bottom portion 41 at the bottom. Further, the lower cap 40 has a shape that matches the peripheral wall 22 of the housing body 20 and has a peripheral wall 43 . Specifically, this peripheral wall 43 has a similar shape that is one size larger than the outer peripheral shape of the peripheral wall 22 of the housing main body 20, and is arranged on the outer periphery of the peripheral wall 22 of the housing main body 20, as shown in FIG. It looks like this. Further, this peripheral wall 43 has a different outer shape from the first valve chamber forming wall 44 that forms the outer periphery of the first valve chamber V1, and forms the outer periphery of the second valve chamber V2. It has a second valve chamber forming wall 45. As shown in FIG. 7, the first valve chamber forming wall 44 has a substantially semicircular shape, while the second valve chamber forming wall 45 has stepped portions 44a extending from both ends of the semicircular portion of the first valve chamber forming wall 44. It has an irregularly shaped outer shape with a reduced diameter.

Further, the bottom portion 41 located below the peripheral wall 43 serves as a portion that supports the first float valve 80 and the second float valve 85. A partition wall 46 is provided upright from the bottom portion 41 and defines the internal space of the lower cap 40 into a first valve chamber V1 and a second valve chamber V2. Further, the bottom portion 41 has a structure that is divided into a first bottom wall 47 and a second bottom wall 49 via the partition wall 46. Note that the first bottom wall 47 constitutes the "bottom wall" in the present invention. Moreover, when the partition wall 46 is attached below the housing main body 20, it overlaps with the lower end of the partition wall 23 of the housing main body 20 (see FIG. 3).

Furthermore, a plurality of locking holes 43a are formed on the outer periphery of the peripheral wall 43. As shown in FIG. 2, by locking each of the corresponding first locking claws 22a of the housing body 20 in each of the locking holes 43a of the lower cap 40, the lower cap is attached below the housing body 20. 40 is attached. As a result, a first valve chamber V1 and a second valve chamber V2 are formed below the housing and communicate with a fuel tank (not shown) via the partition wall 21 (see FIG. 3). Note that the first valve chamber V1 and the second valve chamber V2 are separated from each other by the partition wall 23 of the housing body 20 and the partition wall 46 of the lower cap 40, and are mutually independent spaces. are not communicated.

The second bottom wall 49 has a bottom wall 50 having the lowest height and a shelf-like wall 51 disposed higher than the bottom wall 50. A spring seat 50a having a circular protrusion shape is protruded from the bottom wall 50, and supports the lower end of the second biasing spring S2. Further, a plurality of slits 52a are formed in the peripheral wall 43, the bottom wall 50, and the shelf-like wall 51, and a plurality of elastic pieces 52 that can be flexibly deformed are provided through the slits 52a.

Further, the lower cap 40 constituting the housing 15 is formed with a spring support seat 47a that supports the first biasing spring S1. Specifically, as shown in FIGS. 6 to 8, a plurality of slits 57a are formed inside each wall 54a, 54b, and 54c of the first bottom wall 47, and through the slit 57a, A spring support seat 47a is formed in the radially central portion of the first bottom wall 47. That is, in this embodiment, the spring support seat 47a is formed inside the first bottom wall 47 through the slit 57a. Further, as shown in FIGS. 7 and 8, when viewed from the axial direction of the housing 15, the spring support seat 47a is displaced from the second cylindrical portion 60 in the radial direction of the lower cap 40. Although the spring support seat 47a of this embodiment is located at the same height in the axial direction of the housing 15 with respect to the first bottom wall 47, the spring support seat and the bottom wall are located at different heights. (The spring support seat may be located lower or higher than the bottom wall, and it can be said that the spring support seat and the bottom wall are provided separately.)

Further, the first bottom wall 47 is provided with a plurality of elastic pieces 57 that can be bent and deformed via the plurality of slits 57a. As shown in FIG. 5, a support shaft 56 having a cross-shaped cross section is vertically disposed at a predetermined height from the center of the surface of the spring support seat 47a. As shown in FIG. 3, this support shaft 56 is inserted into the cylindrical portion 81a of the first float valve 80 and guides the vertical movement of the first float valve 80. As shown in FIG. 7, when the housing 15 is viewed from the axial direction (meaning the direction along the axis C of the housing 15), the lower cap 40 that constitutes the housing 15 is viewed from the axial direction. At this time, a space 58 having a predetermined width is formed between the peripheral wall 43 of the lower cap 40 and the side wall 54c of the first cylindrical portion 54. Further, the support shaft 56 is inserted into the first biasing spring S1 so that the spring support seat 47a supports the lower end of the first biasing spring S1 (see FIG. 4).

Further, as shown in FIG. 6, a substantially cylindrical first cylindrical portion 54 is provided vertically from the back side of the first bottom wall 47. As shown in FIG. As shown in FIG. 8, the first cylindrical portion 54 has a cylindrical shape surrounded by four walls and open at the bottom. Among the walls constituting the first cylindrical portion 54, an outer wall 54a has a curved surface shape that matches the peripheral wall 43, and an inner wall 54b that has a flat surface shape that matches the partition wall 46 is arranged at a position opposite to this outer wall 54a. has been done. Further, the ends of both walls 54a, 54b are connected by side walls 54c, 54c, and this side wall 54c has a curved shape disposed inside the outer periphery of the peripheral wall 43. As shown in FIGS. 3 and 4, the lower opening of this first cylindrical portion 54 forms a first communication hole 55. As shown in FIGS.

The first communication hole 55 is arranged at a height that regulates the tank to be full before additional refueling, and communicates the internal space of the fuel tank 1 and the internal space of the first valve chamber V1 with each other in a state where the tank is not submerged in liquid. The opening area is such that continuous oil supply from the oil supply nozzle 9 is possible. Furthermore, when the first communication hole 55 is in a submerged state, the air inflow rate from the second communication hole 63 and the third communication hole 33 cannot keep up with the continuous oil supply rate from the oil supply nozzle 9, and the first valve chamber V1 When the fuel level L2 in the fuel tank rises, the first opening 26 of the first float valve 80 is closed (see FIG. 11), and continuous fueling from the fueling nozzle 9 is stopped.

Note that the opening area of the first communication hole 55 is larger than that of the second communication hole 63 and the third communication hole 33, and is larger than the opening area of the second communication hole 63 and the third communication hole 33. , located below in the axial direction of the housing 15.

The full tank regulation valve 10 has a second cylinder that communicates with the second communication hole 63, extends upward within the first valve chamber V1, and has an opening 67 above the second communication hole 63. It has a shaped part 60. In this embodiment, a pair of second cylindrical portions 60, 60 are provided on the first bottom wall 47 of the lower cap 40 on the first valve chamber V1 side.

As shown in FIG. 4, each of the second cylindrical portions 60 is positioned in alignment with the lower cylindrical portion 61 provided on the back side of the first bottom wall 47 and the internal space of the lower cylindrical portion 61. and an upper cylindrical portion 62 provided on the surface side of the first bottom wall 47.

As shown in FIGS. 6 and 8, the lower cylindrical portion 61 is located at a position projecting outward from both side walls 54c, 54c of the first cylindrical portion 54, and mutually extends when viewed from the axial direction of the housing 15. A pair of outer walls 61a, 61b are arranged to be substantially orthogonal to each other and extend downward from the back side of the first bottom wall 47, and the ends of these pair of outer walls 61a, 61b are connected to the first bottom wall 47. It has a substantially triangular cylindrical shape formed by being connected to a predetermined location of the side wall 54c of the cylindrical portion 54 (that is, a portion of the side wall 54c also becomes one of the walls constituting the lower cylindrical portion 61). , has an open shape at the bottom. As shown in FIG. 4, the lower opening of this lower cylindrical portion 61 serves as a second communication hole 63. Note that, as shown in FIGS. 7 and 8, when viewed from the axial direction of the housing 15, the second cylindrical portion 60 is displaced in the radial direction with respect to the spring support seat 47a.

Further, as shown in FIG. 4, a circular hole-shaped through hole 64 passing through the first bottom wall 47 is formed in the first bottom wall 47 at a position that matches the internal space of the lower cylindrical portion 61. A substantially cylindrical upper cylindrical portion 62 extends upward (towards the partition wall 21) within the first valve chamber V1 from the front side periphery of the through hole 64. Note that the upper cylindrical portion 62 has a shape in which a lower end portion 65 thereof is connected to the surface side of the first bottom wall 47 so as to surround the inner peripheral edge of the through hole 64, and extends to surround the through hole 64. You can say that. Further, an opening 67 is provided inside the tip 66 of the upper cylindrical portion 62, and this opening 67 communicates with the through hole 64. Therefore, the second cylindrical part 60 connects the inside of the fuel tank 1 and the first valve through the second communication hole 63, the internal space of the lower cylindrical part 61, the through hole 64, the internal space of the upper cylindrical part 62, and the opening 67. The interior of the chamber V1 is configured to communicate with each other. Further, the opening 67 of the second cylindrical portion 60 is provided above the spring support seat 47a (see FIG. 4). Note that the lower cylindrical portion 61 and the upper cylindrical portion 62 in this embodiment are vertically provided with respect to the surface direction of the first bottom wall 47 .

The second cylindrical portion 60 described above constitutes the “cylindrical portion” in the present invention. The second communication hole 63 allows the interior of the fuel tank 1 and the interior of the first valve chamber V1 to communicate with each other through the cylindrical portion (second cylindrical portion 60). Further, the opening area of the opening 67 of the cylindrical portion (in this case, the upper cylindrical portion 62 of the second cylindrical portion 60) is set to be smaller than the opening area of the second communication hole 63.

Furthermore, in this full tank regulation valve 10, the housing 15 has a bottom wall, and the second cylindrical portion 60 extends from the first bottom wall 47. In this embodiment, as shown in FIG. It has an extended configuration.

Further, in this full tank regulation valve 10, the housing 15 has a peripheral wall, and the second cylindrical portion 60 has a cylindrical shape extending apart from the peripheral wall. Here, as shown in FIG. 4, an upper cylindrical portion 62 and a lower cylindrical portion 61 extend from both the front and back surfaces of the first bottom wall 47 of the lower cap 40, respectively. Further, the upper cylindrical portion 62 has a cylindrical shape extending apart from the peripheral wall 43 of the lower cap 40 . Further, the upper cylindrical portion 62 extends apart from the peripheral wall 22 of the housing body 20 as well.

Further, as shown in FIG. 7, when the housing 15 is viewed from the axial direction, the bottom wall of the first valve chamber V1 side and the first float valve 80 disposed within the first valve chamber V1; A second cylindrical portion 60 is provided on both sides along the partition wall 46 . In the case of this embodiment, when the housing 15 is viewed from the axial direction as shown in FIG. 7, the first bottom wall 47 provided on the first valve chamber V1 side, Both sides of the first float valve 80 along the partition wall 46, that is, the space 58 formed between the peripheral wall 43 of the lower cap 40 and the side wall 54c of the first cylindrical portion 54, as described in paragraph 0037, A pair of upper cylindrical portions 62, 62 are disposed at 58, respectively.

In addition, the second circulation hole 63 is arranged at a height that regulates additional oil supply, so that it is possible to supply additional oil when the liquid is not submerged (see Fig. 13), and to stop additional oil supply when the liquid is submerged. (See Figure 15). Note that the second communication hole 63 has an opening area smaller than that of the first communication hole 55 and larger than the opening area of the third communication hole 33, and has a second communication hole 63 having an opening area smaller than that of the first communication hole 55 and larger than the opening area of the third communication hole 33. It is located between the first communication hole 55 and the third communication hole 33.

Next, the upper cover 70 attached above the housing body 20 will be explained with reference to FIGS. 1, 3, and the like.

The upper cover 70 has a substantially hat-like shape, and includes a circumferential wall 71 having a substantially circular outer circumference, a ceiling wall 72 disposed above the circumferential wall 71, and a flange portion 73 extending outward from the lower side of the circumferential wall 71. I am doing it. As shown in FIG. 3, a fuel vapor exhaust port 74a is formed in the peripheral wall 71, and a fuel vapor exhaust pipe 74 extends in the outer diameter direction from the front peripheral edge of the fuel vapor exhaust port 74a. A vent tube 7 connected to the canister 6 is connected to the fuel vapor exhaust pipe 74. The entire fill-up regulating valve 10 can be attached to the fuel tank 1 by welding the flange portion 73 of the upper cover 70 to the front side periphery of a mounting hole (not shown) of the fuel tank 1.

Further, as shown in FIG. 1, a plurality of locking pieces 75 extend downward from predetermined positions in the circumferential direction of the flange portion 73. Each locking piece 75 is formed with a locking hole 75a into which a second locking pawl 22b provided on the housing body 20 locks.

Then, as shown in FIG. 2, by locking the corresponding second locking claws 22b of the housing body 20 in the locking holes 75a of each locking piece 75 of the upper cover 70, as shown in FIG. Next, the upper cover 70 is mounted above the housing body 20 with the seal ring 28b mounted in the ring mounting groove 28a in contact with the inner periphery 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 21 (see FIG. 3).

As shown in FIG. 3, in the first valve chamber V1, a first float valve 80 that opens and closes the first opening 26 has a first biasing spring S1 interposed between it and the lower cap 40. It is housed in such a way that it can be raised and lowered. Further, in the second valve chamber V2, a second float valve 85 that opens and closes the second opening 27 is movable up and down with a second biasing spring S2 interposed between it and the lower cap 40. It will be housed in. Both float valves 80 and 85 rise due to their own buoyancy and the biasing forces of biasing springs S1 and S2 when immersed in fuel, and descend due to their own weight when not immersed in fuel.

As shown in FIGS. 1 and 3, the first float valve 80 of this embodiment includes a float body 81 with a circular outer circumference that generates buoyancy when immersed in fuel, and is mounted above the float body 81. It has a seal member 82 that moves up and down relative to the float body 81 and comes into contact with and away from the first opening 26 .

Further, above the seal member 82, a seal valve body 83 made of an elastic material such as rubber or elastic elastomer is mounted. A vent hole 83a that is open at the top and bottom is formed in the center of the seal valve body 83 so as to pass therethrough (see FIGS. 3 and 4). The first float valve 80 functions as a full tank regulating valve by the seal valve body 83 coming into contact with and separating from the back peripheral edge of the first opening 26 to open and close the first opening 26 .

Further, an intermediate valve body 84 is tiltably supported between the float body 81 and the seal member 82 (see FIG. 3). This intermediate valve body 84 normally comes into contact with the lower end of the seal valve body 83 and closes the ventilation hole 83a (see FIGS. 3 and 4), and when the float body 81 descends relative to the seal member 82. , the ventilation hole 83a is opened (see FIG. 13).

Further, within the float main body 81, a substantially cylindrical cylindrical portion 81a is provided vertically. The support shaft 56 of the lower cap 40 is inserted into this cylindrical portion 81a, so that the first float valve 80 is supported so as to be movable up and down (see FIGS. 3 and 4).

On the other hand, the second float valve 85 has a float main body 86 having a circular outer periphery, and a valve head 87 projecting from the upper center of the float main body 86 and having a substantially triangular pyramid shape with a rounded upper end. There is. The second float valve 85 functions as a fuel outflow prevention valve by bringing the valve head 87 into contact with and separating from the back peripheral edge of the second opening 27 to open and close the second opening 27.

The shapes and structures of the housing described above, the housing main body, the lower cap, the upper cover, the float valve, etc. that constitute the housing are not particularly limited. Further, the housing does not have to be composed of three parts: the housing body, the lower cap, and the upper cover. Further, the first float valve 80 in this embodiment has a multi-component configuration including a float body 81, a seal member 82, etc., but the float valve may include, for example, a seal member made of an elastic material mounted above. The shape and structure are not particularly limited as long as the opening can be opened and closed.

In addition, in this embodiment, two valve chambers (first valve chamber V1, second valve chamber V2), two openings (first opening 26, second opening 27), and two float valves ( The structure includes a first float valve 80 and a second float valve 85), but there are also valves with one valve chamber, opening, and float valve, and valves with three or more valve chambers, openings, and float valves. It may be applied to a valve having a

Further, in this embodiment, the upper cylindrical part 62 constituting the second cylindrical part 60, which is the "cylindrical part" of the present invention, is connected to the first bottom wall 47 of the lower cap 40, as shown in FIG. It has a shape in which the opening 67 is provided on the inner side of the upper end, and extends apart from the peripheral wall 43 of the lower cap 40 and the peripheral wall 22 of the housing main body 20, but is not limited to this embodiment. isn't it.

For example, in FIG. 18, a second communication hole 63 is formed in the peripheral wall 22 of the housing main body 20, and a cylinder is formed so as to surround the second communication hole 63 and spaced apart from the peripheral wall 22 of the housing main body 20. A configuration in which the shaped portion 60A extends is described. This cylindrical portion 60A is provided with an opening 67 at the top, and this opening 67 is located above the second communication hole 63.

In FIG. 19, similarly to the embodiment described above, a lower cylindrical part 61 is provided that surrounds a through hole 64 formed in the first bottom wall 47 of the lower cap 40, and the lower opening forms the second communication hole 63. , a cylindrical portion 60B with an open bottom is provided in a row on the peripheral wall 22 of the housing body 20, and a through hole 64 formed in the first bottom wall 47 is surrounded by the lower opening of the cylindrical portion 60B. is listed. Further, although the ceiling wall of the cylindrical portion 60B is closed, an opening 67 located above the second communication hole 63 is formed on the upper side of the cylindrical portion 60B.

Furthermore, (1) a second communication hole is formed in the peripheral wall of the housing body, and the cylindrical part extends integrally with the peripheral wall of the housing body so as to surround the second communication hole and not separated from the peripheral wall of the housing body. (2) the upper part of the cylindrical part extending apart from the bottom wall of the lower cap to the peripheral wall is closed, and an opening is provided on the side of the cylindrical part; (3) the housing A second communication hole is formed in the peripheral wall of the main body, and a bottom wall is provided that extends horizontally from the inner surface of the peripheral wall of the housing body toward the inside of the valve chamber, and a cylindrical part is provided between the bottom wall and the peripheral wall of the housing main body. (In this case, the housing may have a cylindrical shape that is not separated from the peripheral wall of the housing body), and the shape and structure of the cylindrical portion are not particularly limited.

In this full tank regulation valve 10, when the fuel level L1 in the fuel tank 1 rises during refueling and the first communication hole 55 is submerged, the first float valve 80 rises and the first Continuous refueling is stopped by closing the opening 26 (see FIG. 11), and when the fuel level L1 in the fuel tank 1 further rises due to additional refueling and the second flow hole 63 is submerged, additional refueling is performed. (See FIG. 17). This will be explained below with reference to FIGS. 9 to 17.

As shown in FIG. 4, even if the fuel tank 1 is filled with fuel, if the first float valve 80 is not immersed in the fuel, the first float valve 80 will descend under its own weight and The opening 26 is open, and the first valve chamber V1 and the ventilation chamber R are in communication through the first opening 26. In this state, the first communication hole 55, the second communication hole 63, and the third communication hole 33 are all open and not submerged in liquid. Further, the lower end portion of the seal valve body 83 of the first float valve 80 contacts the intermediate valve body 84, and the vent hole 83a of the seal valve body 83 is closed.

As shown in FIGS. 9 and 10, as fuel is supplied into the fuel tank 1, the air in the fuel tank 1 passes through the circulation holes 55, 63, and 33, and flows into the first valve chamber V1. flow inside. Here, as shown by the arrow in FIG. 9, air mainly passes through the first communication hole 55 and flows into the first valve chamber V1. The air that has flowed into the first valve chamber V1 passes through the first opening 26, flows into the ventilation chamber R, and is discharged through the vent tube 7 to the canister 6 outside the fuel tank 1. In this way, the air within the fuel tank 1 is discharged to the outside of the fuel tank 1, thereby making it possible to refuel the fuel tank 1 (continuous refueling).

Thereafter, when the fuel reaches the first communication hole 55, the fuel flows into the first valve chamber V1 through the first communication hole 55, and the float main body 81 is immersed in this fuel. Float valve 80 gradually rises.

When the first communication hole 55 is submerged by the fuel, the fuel liquid level L2 rises all at once in the first valve chamber V1, and the fuel flows into the upper cylindrical part 62, as shown in FIG. As a result, the opening 67 of the second cylindrical portion 60 is submerged in the liquid. In this state, the second communication hole 63 is not submerged in liquid and is open, but since the second communication hole 63 communicates with the second cylindrical part 60, the second communication hole 63 and the second cylindrical part 60 Gas flow between the inside of the fuel tank 1 and the first valve chamber V1 is cut off. The first float valve 80 further rises and the seal valve body 83 comes into contact with the back side peripheral edge of the first opening 26, thereby closing the first opening 26 (see FIG. 11). As a result, gas flow (air flow) between the first valve chamber V1 and the ventilation chamber R through the first opening 26 is blocked. Then, the fuel in the fuel tank 1 rises up the fuel supply pipe 2 and comes into contact with the full tank sensor (not shown) of the fuel supply nozzle 9, and the full tank is detected (see FIG. 12). Refueling inside the tank will be stopped and a full tank regulation will be implemented.

As described above, even when the first communication hole 55 and the opening 67 of the second cylindrical portion 60 are submerged in liquid, the third communication hole 33 remains open without being submerged in liquid. At this time, if the fuel liquid level L2 in the first valve chamber V1 is higher than the fuel liquid level L1 in the fuel tank 1, the third communication hole 33 allows air in the fuel tank 1 to flow into the first valve chamber V1. It is configured to allow inflow. Therefore, the air in the fuel tank 1 flows into the first valve chamber V1 from the third communication hole 33, as shown by the arrow in FIG.

Then, as shown in FIG. 13, the air flowing into the first valve chamber V1 pushes the fuel liquid level L2 in the first valve chamber V1, causing the fuel liquid level L2 to fall, causing the float body to The amount of fuel immersed in 81 is reduced. Further, the fuel that has flowed into the upper cylindrical part 62 of the second cylindrical part 60 and submerged the opening 67 is also pushed by the air and passes through the through hole 64 and the lower cylindrical part 61. It is discharged into the fuel tank 1 from the second communication hole 63. Then, the inside of the fuel tank 1 and the inside of the first valve chamber V1 communicate through the second communication hole 63.

In addition, since the seal valve body 83 that is in contact with the back side peripheral edge of the first opening 26 is maintained in a state stuck to the first opening 26, the seal valve body 83 is attached to the seal member 82. On the other hand, the float main body 81 descends due to its own weight. Then, the intermediate valve body 84 separates from the seal valve body 83, and its vent hole 83a opens (see FIG. 13). As a result, the first opening 26 communicates with the first valve chamber V1 and the ventilation chamber R through the ventilation hole 83a of the seal valve body 83.

Therefore, as shown in FIG. 13, although the first communication hole 55 is maintained in a submerged state, the inside of the fuel tank 1 and the inside of the first valve chamber V1 are communicated through the second communication hole 63, and the first opening The inside of the first valve chamber V1 and the inside of the ventilation chamber R are brought into communication via 26. As a result, as shown by the arrow in FIG. 62) and flows out from the opening 67 into the first valve chamber V1. Further, the air discharged into the first valve chamber V1 flows through the gap between the float body 81 and the seal member 82, the vent hole 83a of the seal valve body 83, the first opening 26, the vent chamber R, and the fuel vapor exhaust port 74a. , the fuel vapor discharge pipe 74, the vent tube 7, and the canister 6 in order, and are discharged to the outside of the fuel tank 1. As a result, as shown by the arrow in FIG. 14, the fuel vapor in the fuel tank 1 is returned to the fuel supply pipe 2 via the circulation tube 3, and the fuel level in the fuel supply pipe 2 falls, so that the fuel Additional refueling into the tank 1 becomes possible.

After that, additional fuel is supplied into the fuel tank 1, and as shown in FIG. 15, the fuel level L1 in the fuel tank 1 rises (see symbol "L1'" in FIG. When the opening is submerged and blocked, gas flow between the inside of the fuel tank 1 and the first valve chamber V1 through the second communication hole 63 and the second cylindrical part 60 is cut off, and the first opening Gas flow between the first valve chamber V1 and the ventilation chamber R through the portion 26 is also blocked. In other words, additional refueling is possible until the second flow hole 63 is submerged due to the fuel level L1. In addition, in this embodiment, as shown by the arrow in FIG. 16, the state in which fuel vapor is returned to the refueling pipe 2 via the circulation tube 3 is maintained, making it possible to refuel additionally little by little. (See oil supply pipe 2 in No. 16).

After that, when the fuel level L2 in the first valve chamber V1 rises and the float main body 81 rises, the intermediate valve body 84 comes into contact with the seal valve body 83, and the vent hole 83a is closed, as shown in FIG. be done. As a result, the gas flow (air flow) between the first valve chamber V1 and the ventilation chamber R through the first opening 26 is blocked again. Then, as in FIG. 12, the fuel in the fuel tank 1 rises up the fuel supply pipe 2 and comes into contact with the full tank detection sensor (not shown) of the fuel supply nozzle 9, and the full tank is detected. Additional refueling inside the tank will be stopped.

(effect)
Next, the effects of the fill-up regulating valve 10 having the above structure will be explained.

That is, as shown in FIGS. 9 and 10, as fuel is supplied into the fuel tank 1, the fuel flows into the first valve chamber V1 through the first communication hole 55, and the first communication hole 55 submerged in liquid. Then, the fuel level L2 in the first valve chamber V1 suddenly rises, and the opening 67 of the second cylindrical part 60 is also submerged, the first float valve 80 rises, and the seal valve body 83 The first opening 26 is closed by contacting the back side peripheral edge of the first opening 26 (see FIG. 11). As a result, the gas flow between the first valve chamber V1 and the ventilation chamber R through the first opening 26 is blocked, so that a full tank is regulated.

Thereafter, the air in the fuel tank 1 flows into the first valve chamber V1 from the third circulation hole 33, as shown by the arrow in FIG. 11, and the fuel liquid level L2 in the first valve chamber V1 decreases. , and the fuel in the second cylindrical part 60 flows out from the second communication hole 63, and at the same time, the fuel in the second cylindrical part 60 is discharged from the seal member 82 to which the seal valve body 83 stuck to the back peripheral edge of the first opening part 26 is attached. Then, the float main body 81 descends.

Then, as shown in FIG. 13, the inside of the fuel tank 1 and the inside of the first valve chamber V1 are communicated through the second communication hole 63, and the inside of the first valve chamber V1 and the inside of the ventilation chamber R are connected through the first opening 26. It will be in a connected state. As a result, as shown by the arrow in FIG. Since the fuel is discharged to the outside of the fuel tank 1, additional refueling into the fuel tank 1 becomes possible.

In this full tank regulation valve 10, the gas in the fuel tank 1 flows from the second communication hole 63 through the second cylindrical part 60 into the first valve chamber 1V1 during the above-mentioned additional refueling. Therefore, the gas is less susceptible to the hydraulic pressure of the fuel in the first valve chamber V1, and flows smoothly into the first valve chamber V1, so that additional refueling can be performed quickly.

That is, by providing the second cylindrical part 60 that communicates with the second communication hole 63, the hydraulic pressure of the fuel is received by the wall of the second cylindrical part 60, so that the fuel flows in from the second communication hole 63. The influence on the gas flowing inside the second cylindrical portion 60 can be reduced, and the gas flow resistance can be reduced. As a result, gas can smoothly flow into the first valve chamber V1 from the opening 67 of the second cylindrical portion 60, so that additional oil supply can be performed quickly.

Further, even if the opening 67 of the second cylindrical part 60 is submerged in liquid and fuel enters the second cylindrical part 60, the gas flowing inside the second cylindrical part 60 as described above will Since it is not easily affected by the hydraulic pressure of the fuel in the first valve chamber V1, this gas can push up the fuel in the second cylindrical part 60 and cause it to flow out from the opening 67, so additional refueling can be performed quickly in this case as well. can be done.

Further, as shown in FIG. 4, the full tank regulation valve 10 in this embodiment further includes a biasing spring (first biasing spring S1) that biases the float valve (first float valve 80). , a spring support seat 47a that supports the biasing spring is formed in the housing 15, and the opening 67 of the cylindrical portion (second cylindrical portion 60) is provided above the spring support seat 47a. .

According to this aspect, since the opening 67 of the second cylindrical part 60 is provided above the spring support seat 47a, the opening 67 of the second cylindrical part 60 is supported by the spring support seat 47a. It can be provided at a position that has little influence on the first biasing spring S1 and the first float valve 80. Therefore, as described in paragraphs 0077 and 0078 above, during additional refueling, gas in the fuel tank 1 flows from the second circulation hole 63 into the first valve chamber 1V1 via the second cylindrical part 60. (If the opening of the cylindrical part is located below the spring support seat 47a, depending on the position of the biasing spring and the float valve, the opening of the cylindrical part may (may be partially or completely occluded).

In this full tank regulation valve 10, the gas in the fuel tank 1 flows from the second communication hole 63 through the second cylindrical part 60 into the first valve chamber 1V1 during the above-mentioned additional refueling. Therefore, the gas is less susceptible to the hydraulic pressure of the fuel in the first valve chamber V1, and flows smoothly into the first valve chamber V1, so that additional refueling can be performed quickly.

Further, in this embodiment, as shown in FIG. The shaped portion 62 ) extends from the first bottom wall 47 .

According to the above aspect, since the second cylindrical portion 60 extends from the first bottom wall 47, the upper cylindrical portion 62 of the second cylindrical portion 60 can be easily extended upward, and the second cylindrical portion 60 extends upwardly. The flow resistance of the gas flowing inside the two-cylindrical portion 60 can be more easily reduced.

Further, since the second cylindrical portion 60 extends from the first bottom wall 47, for example, a pin-shaped protrusion or the like may be inserted into a mold for molding the first bottom wall 47 of the lower cap 40 constituting the housing 15. A gas flow path is formed inside the second cylindrical portion 60 by cutting out the pin-shaped protrusion and the like together with the mold when the first bottom wall 47 of the lower cap 40 is molded and then removed from the mold. It can be molded and the moldability can be improved.

Furthermore, in this embodiment, the housing 15 has a peripheral wall, and the second cylindrical portion 60 has a cylindrical shape extending apart from the peripheral wall. As in this embodiment, for example, when the housing 15 has a housing main body 20 provided with a peripheral wall 22 and a lower cap 40 attached below the housing main body 20 and provided with a first bottom wall 47 and a peripheral wall 43, the lower cap 40 shown in FIG. As shown in FIG. 2, the lower end of the peripheral wall 22 of the housing body 20 is inserted between the peripheral wall 43 of the lower cap 40 and the upper cylindrical part 62 of the second cylindrical part 60, and the lower end of the housing body 20 is inserted. The lower cap 40 can be attached, and the joint strength and sealing performance of the joint between the housing body 20 and the lower cap 40 can be improved.

Further, in this embodiment, the opening area of the opening 67 of the cylindrical part (here, the upper cylindrical part 62 of the second cylindrical part 60) is set to be smaller than the opening area of the second communication hole 63. has been done. According to this aspect, the gas flowing into the second cylindrical part 60 from the second communication hole 63 makes it easier to push up the fuel that has entered into the second cylindrical part 60, and moves the gas in the fuel tank into the first cylindrical part 60. It is possible to more smoothly flow into the valve chamber V1.

Furthermore, in this embodiment, as shown in FIG. 7, when the housing 15 is viewed from the axial direction, the bottom wall on the first valve chamber V1 side and the first valve chamber disposed within the first valve chamber V1 are The second cylindrical portion 60 is provided on both sides of the first float valve 80 along the partition wall 46 . According to this aspect, the space in the first valve chamber V1 (the space 58 formed between the peripheral wall 43 of the lower cap 40 and the side wall 54c of the first cylindrical portion 54) is effectively used to An upper cylindrical portion 62 of the shaped portions 60 can be provided respectively.

(Other embodiments of full tank regulation valve)
20 to 25 show other embodiments of the fill-up regulating valve according to the present invention. Note that substantially the same parts as those in the embodiment described above are given the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 20, 23, and 24, the full tank regulation valve 10A of this embodiment includes a housing body 20A, a lower cap 40A attached below the housing body 20A, and a lower cap 40A attached above the housing body 20A. It has a housing 15A consisting of an upper cover 70A to which it is attached.

Further, the second cylindrical portion 60C, which constitutes the “cylindrical portion” of the present invention in the full tank regulation valve 10A, has the following configuration.

As shown in FIGS. 24 and 25, the second cylindrical portion 60C is aligned with the lower cylindrical portion 61C provided on the back side of the first bottom wall 47 and the internal space of the lower cylindrical portion 61. and an upper cylindrical portion 62C provided on the surface side of the first bottom wall 47. Further, as shown in FIGS. 21 and 22, on the first bottom wall 47 of the lower cap 40A on the first valve chamber V1 side, at a position close to the peripheral walls 43 on both sides of the support shaft 56, A pair of second cylindrical portions 60C, 60C are arranged.

As shown in FIG. 25, the upper opening edge 68 of the cylindrical portion 60C (meaning the outer peripheral edge of the opening 67 located at the upper end of the cylindrical portion 60C), in this embodiment, the upper opening edge 68 of the cylindrical portion 60C. The upper end opening edge 68 of the upper cylindrical part 62C that constitutes the cylindrical part 60C has a high height part 68a (hereinafter also simply referred to as "high part 68a") and a low height part in the circumferential direction of the cylindrical part 60C. 68b (hereinafter also simply referred to as "lower portion 68b").

Further, as shown in FIGS. 21 and 25, the upper opening edge 68 of the upper cylindrical portion 62C is inclined with respect to the axial direction of the cylindrical portion 60C (the direction along the axis J1 of the cylindrical portion 60C). It has a diagonally cut shape on plane H. As a result, a high portion 68a and a low portion 68b are formed at the upper opening edge 68 of the upper cylindrical portion 62C. In this embodiment, the inclination angle θ of the plane H with respect to the axis J1 of the cylindrical portion 60C is 45°. Note that the inclination angle θ of the plane H with respect to the axis J1 of the cylindrical portion 60C is preferably 5 to 70°.

Furthermore, as shown in FIGS. 22 and 25, the height of the upper end opening edge 68 of the upper cylindrical portion 62C decreases in the direction away from the axis J2 of the float valve (first float valve 80). It is set. In this embodiment, the high-height portion 68a of the upper end opening edge 68 of the upper cylindrical portion 62C is arranged radially inward of the first valve chamber V1, and the upper end opening edge 68 The lower height portion 68b is arranged radially outward of the first valve chamber V1, and the height of the upper end opening edge 68 is in the direction away from the axis J2 of the first float valve 80. It has a structure that gradually becomes lower towards the top.

Note that the above "height" refers to the height from the lower end of the cylindrical part 60C, that is, the height in the axial direction of the cylindrical part 60C from the lower end of the lower cylindrical part 61C that constitutes the cylindrical part 60C. It means.

Furthermore, as shown in FIGS. 21 and 22, a groove 41a is formed all around the bottom 41 of the lower cap 40A. As shown in FIG. 25, the lower end 22a of the peripheral wall 22 of the housing body 20A is inserted into the groove 41a.

Further, the upper end opening edge 68 of the upper cylindrical portion 62C in this embodiment has a shape cut diagonally on one plane H, thereby providing a structure with a high portion 68a and a low portion 68b. However, the structure in which the height difference of the upper opening edge of the cylindrical part is provided is not limited to this embodiment. For example, the upper opening edge of the cylindrical part may be (1) cut with a step-like cut to create a height difference, (2) cut with multiple planes at different angles to create a height difference, or (3) ) A height difference may be created by cutting with a concave curved surface. Furthermore, in this embodiment, the height of the upper end opening edge 68 of the cylindrical portion 60C is set to decrease in the direction away from the axis J2 of the float valve, but the arrangement of the cylindrical portion For example, (1) the high portion may be arranged toward the direction close to the peripheral wall 43 and the low portion may be arranged toward the axis of the float valve, or (2) the high portion may be arranged toward the arc-shaped portion of the peripheral wall 43. (3) The low portion may be placed toward the arcuate portion of the peripheral wall 43, or the high portion may be placed toward the partition wall 46. There is no particular limitation.

(effect)
Next, the effects of the full tank regulation valve 10A having the above structure will be explained.

That is, in this embodiment, as shown in FIG. 25, the upper end opening edge 68 of the cylindrical portion 60C has a high height portion 68a and a low height portion 68b in the circumferential direction of the cylindrical portion 60C. It has

According to the above aspect, the upper opening edge 68 of the cylindrical portion 60C has a higher height portion 68a and a lower height portion 68b, and the latter lower portion 68b is the lower portion of the cylindrical portion 60C. Since the distance from the lower end (here, the lower end of the lower cylindrical part 61C constituting the cylindrical part 60C) is short, the fuel flowing into the cylindrical part 60C from the lower end opening flows into the lower part 68b of the upper opening edge 68. When this happens, the pressure is released from the low portion 68b, and more fuel tends to flow out from the low portion 58b. As a result, when the fuel flows into the cylindrical part 60C from the second flow hole 63 at the lower end of the cylindrical part and flows out from the upper opening 67 due to the rocking of the vehicle, etc. 25, the fuel flows out while changing its course at the lower part 58b of the upper opening edge 68, as shown by the two-dot chain line in FIG. Here, it is possible to make it difficult for fuel to flow into the first opening 26).

Further, in this embodiment, as shown in FIGS. 22 and 25, the height of the upper opening edge 68 of the cylindrical portion 60C is set away from the axis J2 of the float valve (here, the first float valve 80). It is set to become lower towards the direction.

According to the above aspect, the height of the upper end opening edge 68 of the cylindrical portion 60C is set to decrease in the direction away from the axis J2 of the first float valve 80, so that The fuel that flows into the shaped portion 60C and flows out from the upper end opening can flow out in the direction of the outer diameter of the first float valve 80. As a result, it is possible to make it more difficult for fuel to flow into the first opening 26 of the housing 15A.

Further, as shown in FIGS. 21 and 25, in this embodiment, the upper opening edge 68 of the cylindrical portion 60C is cut diagonally on a plane H that is inclined with respect to the axial direction of the cylindrical portion 60C. It has a similar shape.

According to the above aspect, since the upper end opening edge 68 of the cylindrical portion 60C has a shape cut along the plane H inclined with respect to the axial direction of the cylindrical portion 60C, the upper end opening of the cylindrical portion 60C To facilitate the formation of a high portion 68a and a low portion 68b of the edge portion 68, and to facilitate changing the course of fuel flowing into the cylindrical portion 60C from the lower end opening and flowing out from the upper end opening. I can do it.

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

1 Fuel tank 10, 10A Full tank regulation valve 15, 15A Housing 20, 20A Housing body 21 Partition wall 26 First opening 27 Second opening 40, 40A Lower cap 47 First bottom wall (bottom wall)
47a Spring support seat 54 First cylindrical part 55 First communication hole 60, 60C Second cylindrical part (cylindrical part)
61, 61C Lower cylindrical portion 62, 62C Upper cylindrical portion 63 Second communication hole 67 Opening 68 Upper opening edge 68a High height portion 68b Low height portion 70 Upper cover 80 First float valve 85 Second float Valve R Ventilation chamber S1 First biasing spring (biasing spring)
S2 Second biasing spring V1 First valve chamber V2 Second valve chamber

Claims (9)

A valve chamber that communicates with the inside of the fuel tank is provided below through a partition wall, and a ventilation chamber that communicates with the outside of the fuel tank is provided above, and an opening that communicates between the valve chamber and the ventilation chamber is formed in the partition wall. a housing and a
a float valve that is movably housed in the valve chamber and closes the opening when the fuel level rises to a predetermined height during refueling into the fuel tank;
a first communication hole formed in a lower part of the housing and communicating between the inside of the fuel tank and the inside of the valve chamber;
a second communication hole formed above the first communication hole in the housing and allowing the inside of the fuel tank and the inside of the valve chamber to communicate with each other;
a third communication hole formed in the housing further above the second communication hole, and allowing the inside of the fuel tank and the inside of the valve chamber to communicate with each other;
a cylindrical portion that communicates with the second communication hole, extends upward within the valve chamber, and has an opening above the second communication hole;
The second communication hole allows the inside of the fuel tank and the inside of the valve chamber to communicate with each other through the cylindrical part,
When the fuel level in the fuel tank rises during refueling and the first flow hole is submerged, the float valve rises to close the opening and stop continuous refueling;
A full tank regulating valve characterized in that the additional fuel supply is stopped when the fuel level in the fuel tank further rises due to the additional fuel supply and the second flow hole is submerged. further comprising a biasing spring that biases the float valve;
The housing is formed with a spring support seat that supports the biasing spring,
2. The full tank regulation valve according to claim 1, wherein the opening of the cylindrical portion is provided above the spring support seat. The full tank regulating valve according to claim 1 or 2, wherein the housing has a bottom wall, and the cylindrical portion extends from the bottom wall. The full-fill regulating valve according to any one of claims 1 to 3, wherein the housing has a peripheral wall, and the cylindrical portion has a cylindrical shape extending apart from the peripheral wall. The full tank regulation valve according to any one of claims 1 to 4, wherein the opening area of the opening of the cylindrical portion is set to be smaller than the opening area of the second flow hole. The housing has a partition that defines the valve chamber into a first valve chamber and a second valve chamber,
The opening includes a first opening that communicates the first valve chamber and the ventilation chamber, and a second opening that communicates the second valve chamber and the ventilation chamber,
The float valve is housed in the first valve chamber so as to be movable up and down, and closes the first opening when the liquid level in the fuel tank reaches a predetermined full tank level. and a second float valve that is housed in the second valve chamber so as to be movable up and down, and that closes the second opening when the liquid level in the fuel tank rises above a predetermined height,
The housing has a bottom wall, and when the housing is viewed from the axial direction, the bottom wall is on the first valve chamber side, and the first float valve disposed in the first valve chamber is located at the bottom wall on the first valve chamber side. The full tank regulating valve according to any one of claims 1 to 5, wherein the cylindrical portion is provided on both sides along the partition wall. According to any one of claims 1 to 6, the upper opening edge of the cylindrical portion has a higher height portion and a lower height portion in the circumferential direction of the cylindrical portion. Full tank regulation valve. 8. The full tank regulation valve according to claim 7, wherein the height of the upper opening edge of the cylindrical portion is set to decrease in a direction away from the axis of the float valve. 9. The full tank control valve according to claim 7, wherein the upper opening edge of the cylindrical portion is cut with a plane inclined with respect to the axial direction of the cylindrical portion.

Images