JP4432890B2 - Tank channel structure - Google Patents

Description

  The present invention relates to a tank flow path structure that is attached to an upper portion of a fuel tank and connects the inside and outside of the fuel tank.

  Conventionally, this type of tank channel structure is used as a part of a fuel shut-off valve for venting the inside of a fuel tank to the outside (Patent Documents 1 and 2). 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. With a float. Ensuring ventilation between the inside and outside of the fuel tank when refueling, etc., and the float rises due to increased buoyancy due to the increase in the fuel level of the fuel tank, thereby closing the connection passage and preventing the fuel from flowing out. ing.

  In recent years, flattening of fuel tanks has been studied in order to cope with various and large living spaces of vehicles. However, in the conventional fuel shut-off valve, the passage area of the connection passage is increased and the diameter of the connection hole, which is the opening of the connection passage, is increased from the design condition of the connection passage that secures a flow rate higher than a predetermined value. However, such a connection passage having a larger passage area has a larger shape in the height direction of the fuel cutoff valve, which obstructs the flattening of the fuel tank described above. Further, since the connection hole is enlarged, there is a high possibility that the fuel leaks from the fuel tank.

JP 2002-137441 A JP 11-315765 A

  An object of the present invention is to provide a tank flow channel structure capable of flowing a large flow rate even when the passage area of a connection passage is reduced, in view of solving the problems of the conventional technology. .

The present invention made to solve the above problems
In the tank flow path structure having a connection passage connected to a connection hole communicating the inside and the outside of the fuel tank,
A passage forming member disposed at an upper portion of the fuel tank and having the connection hole;
A lid body having a lid inner wall that is attached to the passage forming member and forms the connection passage between the passage forming member, and a tube passage that is formed in the lid body and connected to the outside;
With
The passage forming member has a passage forming surface protruding from an upper portion of the passage forming member and connecting the connection passage to the pipe passage with a smooth surface;
It is characterized by.

  In the tank channel structure according to the present invention, the fuel vapor in the fuel tank flows from the connection hole to the outside through the connection passage and the pipe passage. The connection passage is formed so as to be connected to the pipe passage in a space between a passage forming member provided in the upper part of the fuel tank and the lid inner wall of the lid. In such a structure, it may be difficult to make the cross-sectional shape of the part connected with a pipe path the same from the point of the structure of the injection mold. The passage forming member includes a passage forming surface that connects the connecting passage to the pipe passage with a smooth surface, and the passage forming surface eliminates the turbulent flow of the airflow flowing from the connecting passage to the pipe passage, thereby reducing pressure loss. . Therefore, even if the connection passage has a small flow passage area, a large flow rate can flow, the height of the connection passage of the tank flow passage structure is lowered, and the tank device is flattened when attached to the fuel tank. Can contribute.

  As a preferred aspect of the present invention, the lid inner wall has a passage groove, and the passage groove can constitute the connection passage by joining the lid inner wall to the passage forming member. In this configuration, the passage forming member and the lid inner wall may be either flat or curved. In the case of a curved surface, for example, the passage forming member includes a wall main body formed of a curved surface projecting upward, and the inner wall of the lid is formed of a curved surface that is in close contact with the wall main body. It becomes flat and suppresses the height of the passage, and allows a wide passage area. Furthermore, in the aspect of the present invention, the tube passage may have a circular cross section, and the passage forming surface may have a U-shaped cross section.

  Furthermore, as a preferred aspect of the present invention, the passage forming member includes a guide portion that has a positioning portion that protrudes from an upper portion of the passage forming member and positions the lid body by being inserted into the passage groove. A guide part can take the structure provided with the said channel | path formation surface. According to this configuration, the positioning portion of the guide portion can be positioned in the lid body by being inserted into the passage groove, and the guide portion also constitutes a passage formation surface of the connection passage, and the air flow is passed through the tube passage. Can flow smoothly. Thus, since the guide part also forms a part of the connecting passage part in addition to the positioning action, the arrangement and configuration thereof can be simplified.

Another aspect of the present invention is as follows:
In the fuel cutoff valve that cuts off the connection passage that connects the inside of the fuel tank to the outside,
A valve chamber surrounded by a passage forming member and a side wall constituting the upper wall and connected to the fuel tank is provided, and a connection hole that is an opening to the valve chamber side of the connection passage is provided in the passage forming member. A casing body;
A lid body having a lid inner wall attached to the passage formation member and forming the connection passage between the passage formation member, and a tube passage formed on the lid body and connected to the outside;
A float that is housed in the valve chamber and that opens and closes the connection passage by moving up and down according to the fuel level in the fuel tank,
The passage forming member has a passage forming surface protruding from an upper portion of the passage forming member and connecting the connecting passage to the pipe passage with a smooth surface.

  As in the aspect of the present invention, the connection passage connecting the inside of the fuel tank to the outside is communicated and cut off, so that it can be suitably applied to a fuel cut-off valve that ensures ventilation with the outside of the fuel tank and prevents fuel from flowing out. can do. When used in this fuel cutoff valve, the flow path resistance of the connection passage is reduced, so that the connection hole can be made small, which is advantageous for the restart valve characteristic.

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 the fuel cutoff valve 10 The tank flow path structure according to this embodiment can be suitably applied to a fuel cutoff valve attached to an upper part of a fuel tank of an automobile. FIG. 1 is a cross-sectional view of the fuel cutoff valve 10. In FIG. 1, 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 cutoff valve 10 includes a casing 20, a float mechanism 50, and a spring 70 as main components. The casing 20 includes a casing main body 30, a bottom member 37, and a lid body 40. A space surrounded by the casing main body 30 and the bottom member 37 is a valve chamber 30S. A spring 70 is provided in the valve chamber 30S. The float mechanism 50 supported by the housing is housed.
A connection passage 42 that connects the valve chamber 30 </ b> S to the outside is formed between the upper portion of the casing body 30 and the lid body 40. The connection passage 42 allows the fuel vapor in the fuel tank FT to escape to the outside through the valve chamber 30S, and regulates the outflow to the canister when the fuel in the fuel tank FT rises to a predetermined liquid level FL1 at the time of refueling. It is to function.

(2) Configuration of Each Part of Fuel Shutoff Valve 10 FIG. 2 is an exploded sectional view of the fuel cutoff valve 10. FIG. 3 is a perspective view showing the casing body 30. The casing body 30 has a cup shape surrounded by a passage forming member 31 that forms an upper wall and a side wall 32, and a lower portion thereof is an opening 30 a. The passage forming member 31 includes a wall main body 31a having a curved surface projecting upward, and an inner welding flange 31b formed along the outer peripheral portion of the wall main body 31a. A connection hole 31 d constituting a part of the connection passage 42 is formed through the central portion of the passage forming member 31. The valve chamber 30S side of the connection hole 31d is a seal portion 31c (FIG. 2).
Further, as shown in FIG. 3, a guide portion 33 for positioning the lid body 40 projects from the outer peripheral portion of the passage forming member 31. The guide portion 33 includes a positioning portion 33 a and a passage forming surface 33 b that constitutes a part of the connection passage 42. The positioning part 33a is formed of parallel standing walls 33c and 33c. The passage forming surface 33b is formed in a curved surface between the standing walls 33c and 33c.

  Returning to FIG. 2, a first communication hole 32 a that connects the inside of the fuel tank FT and the valve chamber 30 </ b> S is formed in the upper portion of the side wall 32. Further, four ribs 32 c provided in the circumferential direction for guiding the float 52 are provided on the inner wall of the side wall 32. The bottom member 37 is a member for closing a part of the opening 30a of the casing body 30 and introducing fuel vapor and liquid fuel into the valve chamber 30S. The bottom member 37 integrally forms a bottom plate 38 and a cylindrical portion 39, and is welded to the lower end of the casing body 30 at the outer peripheral portion of the bottom plate 38. The bottom plate 38 has flow holes 38a and 38b. The cylindrical portion 39 includes an introduction passage 39a, and guides the fuel vapor and liquid fuel from the introduction opening 39b into the valve chamber 30S through the flow holes 38a and 38b.

The lid body 40 includes a lid body 41 and a tubular body portion 45 projecting sideways from the center of the lid body 41, and these are integrally formed. The tube body 45 has a circular tube passage 45a having a circular cross section. One end of the tube passage 45a is connected to the valve chamber 30S of the casing body 30 through the connection passage 42, and the other end is a canister (not shown). Connected to.
The lid body 41 includes a curved lid inner wall 41a and a flange 46 on the outer peripheral portion of the lid inner wall 41a. The flange 46 includes an inner welding end 46a for welding the inner welding flange 31b of the casing body 30, and an outer welding portion 46b that extends on the outer peripheral portion of the inner welding end 46a and is welded to the tank upper wall FTa of the fuel tank FT. It has.

  FIG. 4 is a cross-sectional view showing the upper part of the fuel cutoff valve 10. FIG. 5 is a bottom view of the lid 40. The lid inner wall 41 a of the lid body 41 (ventilation passage body) is a curved surface that follows a part of the spherical surface, and is formed so as to be fitted to the wall body 31 a of the passage forming member 31. A connection passage 42 is formed between the lid inner wall 41a and the wall main body 31a and on the tube body 45 side.

The connection passage 42 is connected to the pipe passage 45a from the connection hole 31d on the valve chamber 30S side, and has a passage area substantially the same as that of the connection hole 31d. The passage groove 44a formed in the lid inner wall 41a and the wall body 31a It is formed by being blocked along the passage. The connection passage 42 includes a curved passage portion 43 that directs the upward airflow from the connection hole 31d in the horizontal direction, and a communication passage portion 44 that is connected to the curved passage portion 43 and arranged in the horizontal direction and guides the airflow to the pipe passage 45a. I have.
The curved passage portion 43 includes an inclined surface 43a connected to the connection hole 31d and a passage upper surface 43b formed from a plane disposed above the connection hole 31d. The inclined surface 43a is formed as a surface facing the connection hole 31d of the curved passage portion 43, that is, is formed so as to be inclined upward from the peripheral portion of the connection hole 31d. The arc shape of the inclined surface 43a is a shape having a center Ow that is eccentric from the center Op of the connection hole 31d toward the pipe passage 45a and downward as the center of the arc.

  6 is a plan view of the fuel cutoff valve 10, FIG. 7 is an enlarged sectional view taken along lines 7A-7A and 7B-7B in FIG. 6, and a sectional view taken along line 7C-7C in FIG. These are sectional views along lines 8-8, 9-9, and 10-10 in FIG. As shown in FIGS. 7A and 7B, the inclined surface 43a is configured such that a cross section cut by a plane perpendicular to the axis of the pipe passage 45a forms a straight line, in other words, as shown in FIG. ), The cross section cut by a plane parallel to the plane including the connection hole 31d is configured to form a straight line, thereby causing the upward airflow flowing out from the connection hole 31d to be directed horizontally. .

As shown in FIG. 8, the passage upper surface 43b constituting the curved passage portion 43 is formed on a flat surface that is continuous from the upper end of the inclined surface 43a and is opposed to a part of the connection hole 31d.
As shown in FIGS. 9 and 10, the communication passage portion 44 is formed so that the cross-sectional shape of the passage upper surface 43b gradually goes to the circular cross-section of the pipe passage 45a. In other words, the passage groove 44a has a smooth curved surface so that the cross-sectional deformation gradually approaches a circle in order to connect the flat passage upper surface 43b to the pipe passage 45a having a circular cross section. Further, the wall main body 31a constitutes a communication passage portion 44 by closing the passage groove 44a, and is connected to the pipe passage 45a having a circular cross section by a passage forming surface 33b formed on the upper surface of the guide portion 33. It is formed so that. The connection passage 42 connects the valve chamber 30S to the canister side with such a configuration, and the operation thereof will be described later.

  As shown in FIG. 2, the float mechanism 50 has a two-stage valve structure with improved restart valve characteristics, and includes a float 52 and an upper valve body 60 disposed on the float 52. The float 52 includes a first float portion 53 and a second float portion 57, which are assembled together. A valve support portion 55 projects from the upper portion of the first float portion 53. The valve support portion 55 is a portion that supports the upper valve body 60 so that the upper valve body 60 can swing. The valve support portion 55 includes a support protrusion 55 a that is a substantially conical protrusion (convex shape). An annular protrusion 55b for preventing 60 from being removed is formed. A spring accommodating gap 53 a is provided in the gap between the outer peripheral portion of the first float portion 53 and the inner peripheral portion of the second float portion 57, and the spring 70 is disposed.

  The upper valve body 60 is a valve for opening and closing the connection passage 42 and improving the restart valve characteristic, and is supported by the valve support portion 55 of the float 52 so as to be able to move up and down and swing. FIG. 11 is an exploded perspective view showing the first valve portion 61 and the second valve portion 65 constituting the upper valve body 60, and FIG. 12 is a cross-sectional view showing the upper valve body 60. The first valve unit 61 includes a substantially cylindrical first valve body 62 and a seat member 64. A support hole 62 a is formed in the first valve body 62 in the axial direction. An attachment portion 62 b for attaching the seat member 64 is formed on the upper portion of the first valve body 62. An annular recess 62c is formed on the outer peripheral portion of the first valve body 62, and four vent holes 62d for connecting the support hole 62a to the outside are formed in the annular recess 62c. A slit 62e is formed in the lower part of the first valve main body 62, and an engaging piece 62g is formed elastically deformable from the fixed piece 62i by the slit 62e. An engagement hole 62h is formed in the engagement piece 62g.

  The sheet member 64 includes a first sheet portion 64a that is attached to and detached from the seal portion 31c, a communication hole 64b that is connected to the support hole 62a, a seal portion 64c that is formed at a lower end portion of the communication hole 64b, and an attachment portion 64d. And is integrally formed of a rubber material. The seat member 64 is attached to the attachment portion 62b of the first valve body 62 by the attachment portion 64d, and the first seat portion 64a has a gap with respect to the upper surface of the first valve body 62, so that the seal portion 31c When seated, it is elastically deformed to improve sealing performance.

11 and 12, the second valve portion 65 includes a cylindrical second valve main body 66. The second valve main body 66 is formed with a bottomed hole that opens downward, and a concave supported portion 66b is formed at the bottom center of the bottomed hole. The supported portion 66b is placed on the valve support portion 55 of the float 52, so that the second valve portion 65 is supported so as to be able to swing with the valve support portion 55 as a fulcrum.
Further, a second seat portion 66c is formed on the upper surface of the second valve body 66, and the second seat portion 66c is separated from the seal portion 64c of the first valve portion 61, thereby opening the communication hole 64b. It is formed to open and close. At the lower part of the second valve body 66, four retaining claws 66d are formed. By engaging with the engagement holes 62h of the first valve body 62, the first valve part 61 is connected to the second valve part 65. It is supported so that it can be raised and lowered. An engagement hole 66e is formed in the upper part of each retaining claw 66d. By engaging with the annular protrusion 55b of the float 52, the second valve portion 65 is supported and can be moved up and down with respect to the float 52. It has been removed. A guide protrusion 66f for guiding the second valve portion 65 in the vertical direction is formed on the outer peripheral portion of the second valve body 66. The guide protrusions 66f are provided on the side wall of the second valve body 66 at four locations at regular intervals in the circumferential direction and in a rib shape in the vertical direction, and are slidable on the inner wall surface of the support hole 62a.
The center of gravity of the upper valve body 60 is set below the supported portion 66b. As a configuration for this purpose, the fixed piece 62i is formed to increase the weight of the lower part. Further, by making the valve support portion 55 convex and the supported portion 66b concave, the upper valve body 60 and the float 52 can be easily centered, and the center of gravity is set downward with respect to the fulcrum. Since it becomes easy, the attitude | position of the upper valve body 60 is also stabilized.

(3) Assembly work of the fuel shut-off valve 10 In FIG. 2, in order to assemble the fuel shut-off valve 10, the float mechanism 50 is assembled in the valve chamber 30S of the casing main body 30, and then the outer peripheral portion of the bottom plate 38 is attached to the casing main body 30. Weld at the bottom of the. Further, the inner welding flange 31b of the casing body 30 and the inner welding end 46a of the lid body 40 are heated by a hot plate or the like, and the positioning portion 33a of the casing body 30 is inserted in accordance with the passage groove 44a of the lid body 40. By doing so, the casing main body 30 and the lid body 40 are positioned and integrated by welding.

(4) Operation of the fuel cutoff valve 10 Next, the operation of the fuel cutoff valve 10 will be described. As shown in FIG. 1, when fuel is supplied into the fuel tank FT by refueling, the fuel vapor that has accumulated in the upper part of the fuel tank FT as the fuel liquid level in the fuel tank FT rises is stored in the cylindrical portion 39. The fluid flows from the introduction opening 39b through the introduction passage 39a into the valve chamber 30S through the circulation hole 38a and the circulation hole 38b. Further, the fuel vapor is released from the valve chamber 30S to the canister side through the connection passage 42 and the pipe passage 45a. When the fuel liquid level in the fuel tank FT reaches the predetermined liquid level FL1, the fuel closes the introduction opening 39b, 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 30S increases, and the liquid fuel flows into the valve chamber 30S through the introduction passage 39a and the flow holes 38a and 38b, and the fuel liquid level passes through the valve chamber 30S. To rise. When the fuel level in the valve chamber 30S reaches the height h0, the former becomes the latter by balancing the buoyancy of the float 52 and the upward force due to the load of the spring 70 and the downward force due to the weight of the float mechanism 50. , The float mechanism 50 is integrally raised and the seat member 64 of the first valve portion 61 is seated on the seal portion 31c to close the connection hole 31d. 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 in the fuel tank FT is consumed and the fuel level is lowered, the float 52 descends with its buoyancy reduced as shown in FIG. As the float 52 descends, the float 52 pulls down the second valve portion 65 through the engagement between the retaining pawl 66 d of the second valve portion 65 and the annular protrusion 55 b of the float 52. Thereby, the 2nd sheet | seat part 66c leaves | separates from the seal | sticker part 64c, and opens the communicating hole 64b. Due to the communication of the communication hole 64b, the pressure below the first valve portion 61 becomes the same pressure as the vicinity of the connection passage 42. Since the retaining pawl 66d is engaged with the engagement hole 62h, the first valve portion 61 is also pulled down via the second valve portion 65. And when the 1st valve part 61 descends, the seat member 64 leaves | separates from the seal part 31c, and the connection channel | path 42 is opened. Thus, by setting the passage area of the communication hole 64b to be smaller than the passage area of the connection hole 31d, the upper valve body 60 opens with a small force and acts to promote the improvement of the restart valve characteristic.

(5) Effects and Effects of Example The effects of the connection passage 42 according to this example will be described with reference to FIG.
(5) -1 As shown in FIG. 1, when the fuel level in the fuel tank FT rises due to refueling, the fuel vapor in the fuel tank flows from the valve chamber 30S through the connection hole 31d, the connection passage 42, and the pipe passage 45a. It flows to the outside. In FIG. 13, the connection passage 42 is composed of a curved passage portion 43 and a communication passage portion 44 that have substantially the same flow path area as the connection hole 31d. small.

(5) -2 Ascending airflow flowing out from the connection hole 31d is bent in the horizontal direction when flowing through the curved passage portion 43, and flows outward from the connecting passage portion 44 through the pipe passage 45a. Part of the ascending airflow flowing out from the connection hole 31d hits the inclined surface 43a of the curved passage portion 43, and the other ascending airflow hits the passage upper surface 43b. As shown in FIG. 7, the inclined surface 43a is a curved surface disposed opposite to the connection hole 31d and is a straight surface when cut by a plane (horizontal plane) parallel to the connection hole 31d. Instead of a flow that concentrates on the central portion of the curved passage portion 43, an updraft is caused to flow to the communication passage portion 44 with a small pressure loss. That is, the airflow that hits the inclined surface 43 a is not concentrated locally in the curved passage portion 43 and is guided to the communication passage portion 44, thereby reducing pressure loss.

(5) -3 The cross-sectional shape of the curved passage portion 43 at the location of the passage upper surface 43b is not circular as in the case of the tube passage 45a, but the communication passage portion 44 gradually changes its cross-sectional shape to the circular shape of the tube passage 45a Since it is formed so as to be connected smoothly, the turbulent flow of the air flow in the connection passage 42 is eliminated, and the pressure loss is reduced.

(5) -4 The connection passage 42 has a small pressure loss, and can flow a large flow rate even with a small channel area. Therefore, since the fuel shut-off valve 10 can be configured with a small flow path area, by reducing the height of the connection passage 42, it is possible to contribute to flattening of the tank device when attached to the fuel tank. .

(5) -5 The connection passage 42 has a small pressure loss and can also reduce the passage area of the connection hole 31d, which is the opening thereof. Therefore, the force for opening the upper valve body 60 can be reduced, and the restart valve characteristic can be improved. Can be improved.

(5) -6 As shown in FIG. 3, the positioning portion 33 a of the guide portion 33 prevents the casing body 30 and the lid body 40 from rotating in the direction and simplifies the assembling work. In addition, the upper surface of the guide portion 33 is provided with a passage forming surface 33b that is connected continuously and smoothly from the curved surface of the passage forming member 31, contributing to reducing the height of the connection passage 42. The airflow from the connection passage 42 to the pipe passage 45a is rectified, and thus the pressure loss can be reduced.

The present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.
The tank flow path structure of the above embodiment is used for a full tank regulating valve that closes the connection passage when the full tank level at the time of refueling is used. You may use for the rollover valve which prevents an outflow.
Furthermore, the tank flow path structure can be applied to various tank joints for venting fuel vapor to the outside, such as a filler pipe circulation circuit, in addition to the fuel cutoff valve.

It is sectional drawing which shows the fuel cutoff valve concerning one Example of this invention. It is sectional drawing which decomposed | disassembled the fuel cutoff valve. It is a perspective view which shows a casing main body. It is sectional drawing which shows the upper part of a fuel cutoff valve. It is a bottom view of a lid. It is a top view of a fuel cutoff valve. It is explanatory drawing explaining the shape of an inclined surface. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 6. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 6. It is sectional drawing along the 10-10 line of FIG. It is a perspective view which decomposes | disassembles and shows the 1st valve part which comprises an upper valve body, and a 2nd valve part. It is sectional drawing which shows an upper valve body. It is explanatory drawing explaining the effect | action of the connection channel | path of a fuel cutoff valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel cutoff valve 20 ... Casing 30 ... Casing main body 30S ... Valve chamber 30a ... Opening 31 ... Upper wall 31a ... Wall main body 31b ... Inner welding flange 31c ... Seal part 31d ... Connection hole 32 ... Side wall 32a ... First communication hole 32c ... Rib 33 ... Guide part 33a ... Positioning part 33b ... Passage forming surface 33c. .. Standing wall 37 ... Bottom member 38a, 38b ... Flow hole 38 ... Bottom plate 39 ... Cylindrical part 39a ... Introduction passage 39b ... Introduction opening 40 ... Lid 41 ... Lid body (ventilation body)
41a ... inner wall of lid 42 ... connecting passage 43 ... curved passage portion 43a ... inclined surface 43b ... upper surface of passage 44 ... communication passage portion 44a ... passage groove 45 ... pipe body Part 45a ... Pipe passage 46 ... Flange 46a ... Inner welding end 46b ... Outer welding part 50 ... Float mechanism 52 ... Float 53 ... First float part 53a ... Spring Storage gap 55 ... Valve support 55a ... Support projection 55b ... Annular projection 57 ... Second float 60 ... Upper valve 61 ... First valve 62 ... 1st valve body 62a ... support hole 62b ... mounting portion 62c ... annular recess 62d ... vent hole 62e ... slit 62g ... engagement piece 62h ... engagement hole 62i. ..Fixing piece 64 ... Seat member 64a ... First seat part 64b ... Communication hole 64c ... Seal part 64d ... Mounting part 65 ... Second valve part 66 ... Second Valve body 66b ... Supported part 66c ... Second sheet part 66d ... Prevention Claw 66e ... engagement hole 66f ... guide protrusion 70 ... spring FT ... fuel tank FTa ... tank upper wall FTb ... mounting hole

Claims (6)

In the tank flow path structure having the connection passage (42) connected to the connection hole (31d) communicating the inside and the outside of the fuel tank (FT),
A passage forming member (31) disposed above the fuel tank (FT) and having the connection hole (31d);
A lid body (41) having a lid inner wall (41a) attached to the passage forming member (31) and forming the connecting passage (42) between the lid forming member (31) and the lid body (41) A lid body (40) having a pipe passage (45a) formed on and connected to the outside;
With
The passage forming member (31) has a passage forming surface (33b) that protrudes from an upper portion of the passage forming member (31) and connects the connection passage (42) to the pipe passage (45a) with a smooth surface. thing,
A tank channel structure characterized by the above. In the tank flow path structure according to claim 1,
The lid inner wall (41a) has a passage groove (44a),
The said channel | path groove | channel (44a) is a flow-path structure for tanks which comprises the said connection channel | path (42) by joining the said lid | cover inner wall (41a) to the said channel | path formation member (31). In the tank channel structure according to claim 1 or 2,
The passage forming member (31) includes a wall body (31a) having a curved surface projecting upward, and the lid inner wall (41a) is formed of a curved surface closely contacting the wall body (31a). Flow channel structure. In the tank channel structure according to any one of claims 2 and 3,
The pipe passage (45a) has a circular cross section, the passage forming surface (33b), and the passage forming surface (33b) has a U-shaped cross section. In the tank channel structure according to any one of claims 2 to 4,
The passage forming member (31) has a positioning portion (33a) that projects from an upper portion of the passage forming member (31) and is inserted into the passage groove (44a) to position the lid body (41). Part (33),
The passage forming surface 33b is a tank channel structure provided in the guide portion (33). In the fuel cutoff valve that cuts off the connection passage (42) that connects the inside of the fuel tank (FT) to the outside,
It has a valve chamber (30S) surrounded by a passage forming member (31) and a side wall (32) constituting the upper wall and connected to the fuel tank (FT), and the valve chamber (30) of the connection passage (42) 30S) a casing body (30) provided with a connection hole (31d) which is an opening to the side in the passage forming member (31);
A lid body (41) having a lid inner wall (41a) attached to the passage forming member (31) and forming the connecting passage (42) between the lid forming member (31) and the lid body (41) A lid body (40) having a pipe passage (45a) formed on and connected to the outside;
A float (52) housed in the valve chamber (30S) and opened and closed according to the fuel level in the fuel tank (FT) to open and close the connection passage (42),
The passage forming member (31) has a passage forming surface (33b) that protrudes from an upper portion of the passage forming member (31) and connects the connection passage (42) to the pipe passage (45a) with a smooth surface. thing,
A fuel shut-off valve characterized by

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