JP2010173396A - Fuel shut-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel shut-off valve 10 which has a structure of making an upper valve element 55 easy to attach to a float 51 and hard to detach by the swelling of a fuel. <P>SOLUTION: The fuel shut-off valve 10 includes a casing 20 and a float mechanism 50. The float 51 of the float mechanism 50 has a pressing part 54, which forms an insertion part 54a at its lower part. An upper valve body 56 of the upper valve element 55 comprises a guide member 57, which is formed from the outside circumferential part of the upper plate part 56a and provided protrusively in a cantilever shape in the up/down direction. When the guide member 57 is attached to the float 51 and when the lower part of the guide member 57 is inserted into the insertion part 54a and the guide side engagement parts 57a pass over float side engagement parts 52c, the guide member 57 moves toward the float 51 while bending with the lower part of the guide member 57 restrained by the pressing part 54 from expanding to the outside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel cutoff valve that is mounted on an upper portion of a fuel tank and that cuts off the communication between the fuel tank and the outside according to the fuel level in the fuel tank.

  Conventionally, patent document 1 etc. are known as this kind of a fuel cutoff valve. The fuel shut-off valve is mounted on the upper part of the fuel tank, and is moved up and down by increasing / decreasing buoyancy in the valve chamber of the casing provided with a connection passage connected to the outside (canister) and the valve chamber of the casing. The float and the upper valve body mounted on the upper part of the float are provided. As the fuel level in the fuel tank rises, the float increases buoyancy, and the upper valve body rises integrally with the float, thereby closing the connection passage and preventing the fuel from flowing out. In such a fuel cutoff valve, when the passage area of the connection passage is large, if the connection passage is directly opened and closed by a float, the float is adsorbed and opened again, so-called reopening valve characteristics are not good, so a small passage area It has a two-stage valve structure provided with an upper valve body having a passage. The upper valve body includes a plurality of guide members projecting from the outer peripheral portion of the upper plate portion of the float, and is engaged with the float via an engagement mechanism such as a claw formed on the guide member. The engagement mechanism works to pull down the upper valve body by engaging with the lowering of the float.

  However, since the upper valve body is made of resin, when the upper valve body is expanded by swelling of the fuel, the upper valve body is easily disengaged at the position of the engagement mechanism and easily comes off the float. Regarding such a problem, there is a problem that it is difficult to attach the upper valve body to the float when it is difficult to come off by increasing the wrap width of the engagement mechanism.

JP 2007-253778 A

  In view of solving the above-mentioned problems of the conventional technology, the present invention has a two-stage float structure in which the upper valve body is easily attached to the float and is not easily detached by fuel swelling. Another object of the present invention is to provide a fuel cutoff valve that can perform a reliable opening / closing operation by the upper valve body.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
Application Example 1 is mounted on the upper part of the fuel tank, and has a casing that forms a valve chamber connected to the outside of the fuel tank and a connection passage that connects the valve chamber and the outside, and is arranged to be movable up and down in the valve chamber. A fuel cutoff valve that communicates and shuts off the fuel tank and the outside by raising and lowering the float mechanism according to the fuel level in the fuel tank,
The float mechanism is
Float,
An upper valve portion that is mounted on the upper portion of the float so as to be movable up and down, and that opens and closes the connection passage, and an upper valve body that is connected to the connection passage and that has a connection hole having a passage area smaller than the connection passage. An upper valve body,
With
The float includes a cylindrical float main body, a guide groove formed in an up-and-down direction on the outer peripheral portion of the float main body, a float-side engagement portion formed on an upper outer periphery of the float main body, and the guide groove. A pressing portion that forms an insertion portion that is continuous and formed below the float-side engagement portion;
The upper valve body includes an upper plate portion, a guide member formed from an outer peripheral portion of the upper plate portion and protruding in a cantilever shape in the up-and-down direction, and a guide member formed on the guide member and engaged with the float-side engagement portion. And a guide side engagement portion provided so as to move the upper valve body up and down within a predetermined range by combining,
When the upper valve body is mounted on the float by inserting the guide member in alignment with the guide groove, before the guide-side engaging portion gets over the float-side engaging portion, When the lower part is inserted into the insertion part and the guide side engaging part gets over the float side engaging part, the lower part of the guide member is restricted from spreading outward by the pressing part. The member is configured to move toward the float while being bent.

  When the fuel level of the fuel tank using the fuel shutoff valve according to Application Example 1 reaches a predetermined liquid level, the float and the upper valve body constituting the float mechanism are united by buoyancy by the fuel flowing into the valve chamber. To rise. As the float mechanism is raised, the upper valve portion of the upper valve body closes the connection passage, thereby blocking the fuel tank from the outside and preventing the fuel from flowing out from the fuel tank. When the float is lowered due to a drop in the fuel level, when the upper valve body opens the connection passage, a connection hole having a smaller passage area than the connection passage is opened first, and the valve closing direction applied to the upper valve body Further, when the guide side engaging portion engages with the float side engaging portion, the float lowers the upper valve body and quickly opens the connection passage, thereby obtaining excellent restart valve characteristics. be able to.

  In addition, when the upper valve body is mounted on the float, if the guide member of the upper valve body is aligned with the guide groove and the upper valve body is pushed down, the guide-side engaging portion of the upper valve body will move to the float side of the float. When it hits the engaging portion and further rides, the guide member tries to spread outward, but since the lower portion of the guide member is inserted into the insertion portion, the outward expansion is restricted by the pressing portion. Then, while the guide member is guided by the pressing portion, the guide side engaging portion gets over the float side engaging portion, whereby the upper valve body is mounted at a predetermined position on the outer peripheral portion of the float. Therefore, since the lower part of the guide member is restricted by the pressing portion even if the upper valve body is made difficult to come off from the float by increasing the width that the guide side engaging portion and the float side engaging portion wrap, The guide member does not expand too much, is guided smoothly, and is excellent in mounting workability.

  Furthermore, even if the upper valve body swells, the lower part of the guide member is inserted into the insertion part and the outward expansion is restricted by the holding part, so that the guide side engagement part and the float side engagement part The width of the wrap is not reduced. Therefore, even if the upper valve body swells, the raising / lowering operation is not hindered.

[Application Example 2]
The float of Application Example 2 includes guide protrusions that guide the inner wall of the casing in the ascending / descending direction along both sides of the guide groove on the outer peripheral portion of the float body, and the pressing portion includes the guide groove. It straddles over the above-mentioned guide protrusion. In this configuration, the guide protrusion on the outer peripheral portion of the float guides the float in a stable posture because it guides in the up-and-down direction with respect to the inner wall of the casing. In addition, since the pressing portion is formed by using the guide ridge, that is, by being stretched over the guide ridge across the guide groove, it does not have a complicated shape.

[Application Example 3]
Application example 3 is a slide in which the side of the guide member arranged on both sides of the guide ridge is slidably positioned with respect to the side of the guide ridge. It is the structure which has a protrusion. With this configuration, the sliding protrusion on the side of the guide member is positioned on both sides of the guide protrusion so as to sandwich the guide protrusion and be slidable with respect to the side of the guide protrusion. The body can be raised and lowered in a stable posture.

It is a top view of the fuel cutoff valve attached to the upper part of the fuel tank of the motor vehicle concerning one Example of the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. It is sectional drawing which decomposes | disassembles and shows a fuel cutoff valve. It is a perspective view which shows a float mechanism. FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. It is the perspective view which fractured | ruptured the float mechanism 50 partially, and was disassembled. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. It is explanatory drawing explaining the assembly | attachment operation | work of the float mechanism 50. FIG. It is explanatory drawing explaining the operation | work following FIG. It is explanatory drawing explaining operation | movement of a fuel cutoff valve. It is explanatory drawing explaining the operation | movement following FIG.

  In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the present invention will be described below.

(1) Schematic configuration of fuel cutoff valve 10 FIG. 1 is a plan view of a fuel cutoff valve 10 attached to the upper part of a fuel tank of an automobile according to an embodiment of the present invention, and FIG. 2 is taken along line 2-2 in FIG. FIG. In FIG. 2, the surface of the fuel tank FT is formed of a composite resin material containing polyethylene, and a mounting hole FTb is formed in the tank upper wall FTa. A fuel shut-off valve 10 is attached to the tank upper wall FTa in a state where the lower part thereof enters the attachment hole FTb. The fuel shut-off valve 10 controls the outflow to the canister when the fuel in the fuel tank rises to a predetermined liquid level at the time of refueling and functions an auto stop. The fuel cutoff valve 10 includes a casing 20, a float mechanism 50, and a spring 60 as main components. The casing 20 includes a casing main body 30, a bottom plate 35, and a lid body 40. A space surrounded by the casing main body 30 and the bottom plate 35 is a valve chamber 20S, and the valve chamber 20S is supported by a spring 60. The float mechanism 50 is accommodated.

(2) Configuration of each part of fuel cutoff valve 10 (2) -1 casing 20
FIG. 3 is an exploded sectional view of the fuel cutoff valve. In FIG. 3, the casing 20 includes a casing body 30, a bottom plate 35 attached to the lower part of the casing body 30, and a lid body 40 attached to the upper part of the casing body 30. The casing body 30 includes a ceiling wall part 32 and a side wall part 33 extending in a cylindrical shape downward from the ceiling wall part 32, and is surrounded by the ceiling wall part 32, the side wall part 33, and the bottom plate 35. A cup-shaped valve chamber 20S is formed, and a lower portion thereof is a lower opening 30a. A connecting passage 32a connected to the valve chamber 20S passes through the central portion of the ceiling wall portion 32, and an annular seal portion 32b is formed on the valve passage 20S side of the connecting passage 32a. An introduction hole 33a that connects the inside of the fuel tank FT and the valve chamber 20S is formed in the upper portion of the side wall portion 33, and an engaging claw 33b is formed in the lower portion thereof. The engaging claw 33 b is for attaching the bottom plate 35.

  The bottom plate 35 is a member that closes the lower opening 30 a of the casing body 30. By engaging an engaging claw 35 a formed on the outer periphery of the bottom plate 35 with the engaging claw 33 b of the casing body 30, the lower opening 35 of the casing body 30 is provided. It is mounted so as to close 30a. A communication hole 35 b is formed through the bottom plate 35. The communication hole 35b communicates with the inside of the fuel tank, the valve chamber 20S, and allows the fuel to flow into the valve chamber 20S. A spring support portion 35 c that supports the spring 60 is formed on the upper portion of the bottom plate 35.

  The lid body 40 includes a lid body 41, a first tubular portion 42 projecting from the center of the lid body 41 to one side, and a first tubular body portion 42 projecting in a direction perpendicular to the first tubular body portion 42 from the center of the lid body 41. 2 pipe parts 43 (refer to Drawing 1), and these are formed in one. Lid 40 forms communication room 21 </ b> S between ceiling body 32 of casing body 30. The first and second tubular body portions 42 and 43 are formed as pipe passages 42a and 43a having circular cross sections, respectively. One end of the pipe passage 42a is connected to the valve chamber 20S of the casing body 30 through the connection passage 32a, and the other end is connected to the canister (not shown) side. Further, one end of the through passage 43a is connected to the valve chamber 20S of the casing body 30 through the connection passage 32a, and the other end is connected to another fuel cutoff valve (not shown). The lid body 41 includes a flange 41a on the outer periphery thereof. The flange 41a is welded to the inner welding end 41b for welding the inner welding flange 30b of the casing body 30, and the outer side extended to the outer peripheral portion of the inner welding end 41b and welded to the tank upper wall FTa (FIG. 2) of the fuel tank FT. A welding portion 41c.

(2) -2 Float mechanism 50
Figure 4 is a perspective view showing a float mechanism 50, FIG. 5 is a sectional view taken along line 5-5 of FIG. 4, FIG. 6 is a sectional view taken along line 6-6 in FIG. 4, FIG. 7 is a float mechanism 50 It is the perspective view which fractured | ruptured partially and was decomposed | disassembled. The float mechanism 50 is housed in the valve chamber 20 </ b> S (FIG. 2) and includes a float 51 and an upper valve body 55. 5 and 6, the float 51 has a float body 51A having a float chamber 51S opened downward. The float main body 51 </ b> A includes an upper wall 52 and a side wall 53 projecting in a cylindrical shape from the outer peripheral portion of the upper wall 52. A lower valve portion 52a of a circular pedestal is formed in the central portion of the upper wall 52, and a through hole 52b formed through the upper wall 52 in the vertical direction is formed on the outer peripheral side of the lower valve portion 52a. . As shown in FIG. 5, a float side engagement portion 52 c for engaging with the upper valve body 55 is formed on the upper outer periphery of the float 51. As shown in FIG. 7, guide ribs 53a are formed on the side wall 53 along the vertical direction and in the circumferential direction at substantially equal intervals in the shape of eight columns, and the outer peripheral ends thereof are the casing body 30 (FIG. 3). The outer diameter of the valve chamber 20S is slightly smaller than the inner diameter of the valve chamber 20S. The guide protrusion 53a guides so as to prevent inclination when the float 51 moves up and down by sliding on the inner wall of the casing body 30. Between each guide protrusion 53a, the guide groove 53b is formed over the full length of the up-down direction. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. A holding portion 54 is stretched over the guide protrusion 53 a at the lower portion of the float 51. The holding portion 54 is enclosed with the guide protrusion 53a and the outer wall of the side wall 53, so that the lower portion of the guide groove 53b is the insertion portion 54a. The float 51 is supported by a spring 60 (FIG. 2) spanned between the lower surface of the upper wall 52 and the bottom plate 35. The spring 60 is positioned by a spring support portion 35 c on the bottom plate 35.

  In FIG. 7, the upper valve body 55 is a valve for improving the restart valve characteristic, and is supported on the upper part of the float 51 so as to be movable up and down, and the upper valve body 56 and the rubber attached to the upper valve body 56. And a valve body 58 (upper valve portion). The upper valve body 56 is formed of a disk-shaped upper plate portion 56a and a plurality of guide members 57 protruding in a cantilever shape with a predetermined gap in the circumferential direction from the outer periphery of the upper plate portion 56a. . The guide member 57 is inserted into the guide groove 53b of the float 51 to guide the upper valve body 55 in the up and down direction. Further, the lower portion of the guide member 57 is inserted into the insertion portion 54 a (FIG. 8) of the float 51, and the outward expansion is restricted by the pressing portion 54.

  As shown in FIG. 5, the upper valve body 55 forms a ventilation gap 55 </ b> S disposed so as to be spaced apart from the upper wall 52 of the float 51. The ventilation gap 55S is connected to the upper space of the valve chamber 20S. In addition, vent holes 56d and 56e are formed in the upper plate portion 56a. These vent holes 56d and 56e are arranged on the outer peripheral side from the through hole 52b. That is, the upper plate portion 56a serves as a shielding wall 56f at a position facing the through hole 52b. The shielding wall 56f blocks fuel droplets flowing out from the through hole 52b, and bypasses the passage from the through hole 52b to the ventilation gap 55S, the ventilation hole 56d, and the ventilation hole 56e. Further, guide side engaging portions 57a are formed on the inner wall of the guide member 57 at positions opposed to each other toward the inner peripheral side. The guide side engaging portion 57a engages with the float side engaging portion 52c formed on the upper outer periphery of the float 51 so that the upper valve body 56 can be moved up and down within a predetermined distance with respect to the float 51. Is arranged.

  FIG. 8 is a cross-sectional view taken along line 7-7 in FIG. On one side of the guide member 57, a sliding protrusion 57b is formed that can slide with respect to the side surface of the guide protrusion 53a. The sliding protrusion 57b has a semicircular cross section, and reduces the backlash of the upper valve body 56 with respect to the float 51 by sandwiching the guide protrusion 53a together with the sliding protrusion 57b of the adjacent guide member 57. .

  In FIG. 7, a valve holding recess 56 c is formed at the center of the upper valve body 56. A rubber valve body 58 is attached to the valve holding recess 56c. The rubber valve body 58 includes a support base 58a that is press-fitted and supported in the valve holding recess 56c, an upper seat portion 58b formed on the outer periphery of the support base 58a, a connection hole 58c that penetrates the support base 58a, and a connection hole A lower seat portion 58d formed at the lower portion of 58c. The upper seat portion 58b contacts and separates from the seal portion 32b of the connection passage 32a shown in FIG. 3, and the lower seat portion 58d contacts and separates from the lower valve portion 52a. Thus, the connection passage 32a is opened and closed via the connection hole 58c.

(3) Assembly of the float mechanism 50 The assembly operation of the float mechanism 50 will be described. FIG. 9 and FIG. 10 are explanatory views for explaining the work of assembling the upper valve body 55 to the float 51. In order to assemble the upper valve body 55 to the float 51, the guide member 57 of the upper valve body 56 to which the rubber valve body 58 is attached is aligned with the guide groove 53b, and the upper valve body 55 is pushed downward. At this time, as shown in FIG. 9, when the guide-side engaging portion 57a of the upper valve body 56 hits the float-side engaging portion 52c of the float 51 and further rides as shown in FIG. 10, the guide member 57 expands outward. However, since the lower portion of the guide member 57 is inserted into the insertion portion 54a, the pressing portion 54 restricts the outward expansion. Therefore, while the guide member 57 is guided by the pressing portion 54, the guide side engaging portion 57 a gets over the float side engaging portion 52 c, and is thereby mounted on the outer peripheral portion of the float 51 at a predetermined position.

(4) Operation of the fuel cutoff valve 10 during refueling Next, the operation of the fuel cutoff valve 10 will be described. When fuel is supplied to the fuel tank FT by a fuel gun (not shown) from the opened state of the fuel shut-off valve 10 shown in FIG. 2, the fuel vapor accumulated in the upper part of the fuel tank FT becomes the fuel in the fuel tank FT. As the liquid level rises, the side wall 33 is released to the canister side through the introduction hole 33a and the communication hole 35b of the bottom plate 35, the valve chamber 20S, the connection passage 32a, the communication chamber 21S, and the pipe passage 42a. At this time, the fuel vapor entering the float chamber 51S passes from the through hole 52b in the upper part of the float 51 to the upper space of the valve chamber 20S through the vent hole 55d and the vent hole 56e (see FIG. 4). Exit.

  As the fuel level in the fuel tank FT rises, as shown in FIG. 11, the liquid fuel flows into the valve chamber 20S through the communication hole 35b and increases the buoyancy of the float mechanism 50. When the fuel liquid level in the fuel tank FT reaches the predetermined liquid level FL1, the fuel closes the introduction hole 33a, thereby increasing the tank internal pressure in the fuel tank FT. In this state, the differential pressure between the tank internal pressure and the pressure in the valve chamber 20S increases, and liquid fuel flows into the valve chamber 20S through the introduction hole 33a and the communication hole 35b, and the fuel level rises in the valve chamber 20S. . When the fuel level in the valve chamber 20S reaches a predetermined height, the former is caused by a balance between the buoyancy of the float mechanism 50 and the upward force due to the load of the spring 60 and the downward force due to the weight of the float mechanism 50. The float mechanism 50 rises integrally with the latter, and the upper seat portion 58b of the rubber valve body 58 of the upper valve body 55 is seated on the seal portion 32b to close the connection passage 32a. At this time, when fuel accumulates in the inlet pipe and the fuel touches the fuel gun, the auto-stop is activated. As a result, when fuel is supplied to the fuel tank, it is possible to escape the fuel vapor from the fuel tank and to prevent the fuel from flowing out of the fuel tank.

  On the other hand, when the fuel level in the vicinity of the fuel shutoff valve 10 decreases due to fuel consumption in the fuel tank FT or vehicle swing, the float 51 of the float mechanism 50 reduces its buoyancy as shown in FIG. Then descend. As the float 51 descends, the lower valve portion 52a moves away from the lower seat portion 58d and opens the connection hole 58c. Due to the communication of the connection hole 58c, the pressure below the upper valve body 55 becomes the same pressure as the vicinity of the connection passage 32a, that is, the force that the upper valve body 55 is adsorbed to the seal portion 32b is reduced. Then, the float side engaging portion 52c of the float 51 engages with the guide side engaging portion 57a of the upper valve body 55, whereby the upper valve body 55 is pulled down, and the upper seat portion 58b is separated from the seal portion 32b and connected. The passage 32a is opened. Thus, by setting the passage area of the connection hole 58c to be smaller than the passage area of the connection passage 32a, the upper valve body 55 is opened with a small force and acts to promote the improvement of the restart valve characteristic.

(5) Effects of fuel cutoff valve 10 The fuel cutoff valve 10 according to the above embodiment provides the following actions and effects.
(5) -1 The float mechanism 50 has a two-stage valve structure in which an upper valve body 55 having a connection hole 58c having an opening area smaller than that of the connection passage 32a is mounted on the upper part of the float 51. The valve opens with a small force and acts to promote the improvement of the restart valve characteristics.

(5) -2 As shown in FIGS. 9 and 10, when the upper valve body 55 is mounted on the float 51, the guide member 57 of the upper valve body 56 mounted with the rubber valve body 58 is aligned with the guide groove 53b. When the upper valve body 55 is pushed down, the guide side engaging portion 57a of the upper valve main body 56 hits the float side engaging portion 52c of the float 51, and when it further rides, the guide member 57 tends to expand outward. Since the lower part of the guide member 57 is inserted into the insertion part 54a, the pressing part 54 restricts the outward expansion. Then, while the guide member 57 is guided by the holding portion 54, the guide side engaging portion 57 a gets over the float side engaging portion 52 c, whereby the upper valve body 55 is mounted at a predetermined position on the outer peripheral portion of the float 51. Is done. Therefore, even if the upper valve body 55 is not easily detached from the float 51 by increasing the width that the guide side engaging portion 57a and the float side engaging portion 52c wrap, the lower portion of the guide member 57 is held by the pressing portion 54. Therefore, the guide member 57 does not expand too much, is guided smoothly, and has excellent mounting workability.

(5) -3 Even if the upper valve body 56 swells with fuel, the lower part of the guide member 57 is inserted into the insertion part 54a and the outward expansion is restricted by the pressing part 54. The wrap width between 57a and the float side engaging portion 52c is not reduced. Therefore, even if the upper valve body 55 swells the fuel, there is no hindrance to the lifting operation.

(5) -4 Since the guide member 57 of the upper valve body 55 is formed long in the ascending / descending direction to the extent that it is inserted into the insertion portion 54 a below the float 51, the upper valve body 55 is placed with respect to the float 51. The backlash can be reduced, and the connection passage can be reliably closed by the upper valve body 55, which makes it difficult for liquid to leak.

(5) -5 Since the guide protrusion 53a on the outer peripheral portion of the float 51 guides the inner wall of the casing 20 in the up-and-down direction, the float 51 can be raised and lowered in a stable posture. In addition, since the pressing portion 54 is formed by using the guide protrusion 53a, that is, spanning the guide protrusion 53a across the guide groove 53b, it does not have a complicated shape.

(5) -6 As shown in FIG. 8, the sliding protrusions 57b on the side of the guide member 57 are on both sides of the guide protrusion 53a, sandwich the guide protrusion 53a, and beside the guide protrusion 53a. Therefore, the upper valve body 55 can be lifted and lowered in a stable posture.

(6) Other Embodiments The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.
The fuel shut-off valve according to the above embodiment was used as a full tank regulating valve that closes the connection passage when the full tank level at the time of refueling, but this is not the only case, and the fuel tank flows out when the vehicle is inclined. You may use for the rollover valve which prevents.

DESCRIPTION OF SYMBOLS 10 ... Fuel cutoff valve 20 ... Casing 20S ... Valve chamber 21S ... Communication chamber 30 ... Casing main body 30a ... Lower opening 30b ... Inner welding flange 32 ... Ceiling wall part 32a ... Connection passage 32b ... Sealing part 33 ... Side wall part 33a ... Introduction Hole 33b ... engaging claw 35 ... bottom plate 35a ... engaging claw 35b ... communication hole 35c ... spring support part 40 ... lid body 41 ... lid body 41a ... flange 41b ... inner welding end 41c ... outer welding part 42, 43 ... first 42a, 43a ... pipe passage 50 ... float mechanism 51 ... float 51A ... float body 51S ... float chamber 52 ... upper wall 52a ... lower valve part 52b ... through hole 52c ... float side engagement part 53 ... side wall 53a ... Guide protrusion 53b ... Guide groove 54 ... Presser part 54a ... Insertion part 55 ... Upper valve body 55S ... Ventilation gap 56d 56e ... Ventilation hole 56 ... Upper valve body 56a ... Upper plate part 56c ... Valve holding recess 56f ... Shielding wall 57 ... Guide member 57a ... Guide side engagement part 57b ... Sliding protrusion 58 ... Rubber valve body 58a ... Support base 58b ... Upper seat portion 58c ... Connection hole 58d ... Lower seat portion 60 ... Spring FT ... Fuel tank FTa ... Tank upper wall FTb ... Mounting hole

Claims (3)

A casing (20S) attached to the upper part of the fuel tank (FT) and connected to the outside of the fuel tank (FT), and a casing (32a) connecting the valve chamber (20S) and the outside (32a) 20) and a float mechanism (50) disposed in the valve chamber (20S) so as to be movable up and down, and by moving the float mechanism (50) up and down according to the fuel level in the fuel tank, the fuel tank In the fuel cutoff valve that cuts off the communication between (FT) and the outside,
The float mechanism (50)
A float (51);
An upper valve portion that is mounted on the float (51) so as to be movable up and down, opens and closes the connection passage (32a), is connected to the connection passage (32a), and has a smaller passage area than the connection passage (32a). An upper valve body (55) having an upper valve body (56) penetrating the connection hole (58c);
With
The float (51) includes a cylindrical float main body (51A), a guide groove (53b) formed in the outer peripheral portion of the float main body (51A) along the ascending / descending direction, and an upper outer periphery of the float main body (51A). A float-side engaging portion (52c) formed on the guide groove (53b) and a holding portion (54a) that is formed below the float-side engaging portion (52c). 54)
The upper valve body (56) includes an upper plate portion (56a), a guide member (57) formed from the outer peripheral portion of the upper plate portion (56a) and protruding in a cantilever shape in the up-and-down direction, and the guide A guide-side engagement portion (57a) formed on the member (57) and provided so as to move the upper valve body (55) up and down within a predetermined range by engaging with the float-side engagement portion (52c). Have
When the upper valve body (55) is mounted on the float (51) by inserting the guide member (57) in alignment with the guide groove (53b), the guide-side engaging portion (57a) Before getting over the float side engaging portion (52c), the lower portion of the guide member (57) is inserted into the insertion portion (54a), and the guide side engaging portion (57a) is inserted into the float side engaging portion ( 52c), the guide member (57) is bent toward the float (51) while the lower part of the guide member (57) is bent outwardly by the pressing portion (54). A fuel cutoff valve, wherein the fuel cutoff valve is configured to move. The fuel cutoff valve according to claim 1,
The float (51) is a guide protrusion (51) that guides in the up-and-down direction with respect to the inner wall of the casing (20) along both sides of the guide groove (53b) on the outer periphery of the float body (51A). 53a)
The said pressure | suppression part (54) is a fuel cutoff valve currently spanning the said guide protrusion (53a) across the said guide groove (53b). The fuel cutoff valve according to claim 1 or 2,
The side portions of the guide member (57) disposed on both sides of the guide ridge (53a) and sandwiching the guide ridge (53a) are opposed to the side portions of the guide ridge (53a). A fuel cutoff valve having a sliding protrusion (57b) that is slidably positioned.

Images