JP2020158056A - Fuel feed mechanism - Google Patents

Abstract

To reduce inflow resistance of a fuel without causing complication of a component shape of a passage formation member which guides a fuel to a fuel tank.SOLUTION: A check valve attached to a filler pipe attached to a fuel tank has: a valve body which opens or closes a fuel passage; and a valve body holding ring forming a valve seat of the valve body. The check valve is held by a check valve holding part. The check valve holding part holds the valve body holding ring at an opening of the fuel passage to position the valve seat at the opening of the fuel passage with a ring holding collar formed by expanding a diameter of a cylinder end part of a pipe holding cylinder attached to the filler pipe at the opening side of the fuel passage.SELECTED DRAWING: Figure 5

Description

The present invention relates to a fuel refueling mechanism.

The fuel refueling mechanism sends the fuel released from the refueling gun to the fuel tank through a filler pipe. When the outside air temperature rises or the fuel consumption device is operated for a long time, the temperature around the tank rises, and the internal pressure of the fuel vapor in the tank may rise accordingly. An increase in the internal pressure of the fuel vapor causes a backflow of fuel into the filler pipe. Therefore, a technique of incorporating a check valve for preventing backflow to the filler pipe into the lower pipe connecting the filler pipe and the fuel tank (Patent Document 1) and a technique of arranging the check valve at the open end of the filler pipe (Patent Document 1). 2) etc. have been proposed.

Japanese Unexamined Patent Publication No. 2008-115940 Japanese Unexamined Patent Publication No. 2011-174606

In the technique of Patent Document 1, since a check valve that rotates two valve bodies is incorporated in the fuel flow path, it is assumed that the check valve in the fuel flow increases the inflow resistance of the fuel. .. Further, since the valve structure has two valve bodies, the number of parts of the check valve becomes relatively large, which may lead to an increase in man-hours for manufacturing parts and man-hours for assembling. In the technique of Patent Document 2, since the check valve having a single structure is arranged at the end of the fuel flow path, the inflow resistance of the fuel is not increased and the number of parts can be reduced. However, since the flow path forming member itself requires a valve body mounting structure, the component shape of the flow path forming member becomes complicated. From these facts, it has been trained to reduce the inflow resistance of fuel without inviting the complicated component shape of the flow path forming member.

The present invention can be realized as the following forms.

(1) According to one form of the fuel refueling mechanism, a fuel refueling mechanism for refueling is provided. This fuel refueling mechanism has a fuel flow path that guides the refueled fuel to the fuel tank, a filler pipe mounted on the fuel tank, a valve body that opens and closes the fuel flow path, and a valve seat of the valve body. The check valve is provided with a check valve having a valve body holding ring for forming the check valve, and a check valve holding portion for holding the check valve so that the valve seat is located at the opening of the fuel flow path. The holding portion is formed on the opening side of the fuel flow path by expanding the diameter of the pipe holding cylinder mounted on the filler pipe and the cylinder end portion of the pipe holding cylinder, and the valve body holding ring is formed by the fuel flow. It has a ring holding ring that holds it in the opening of the road).
In this form of fuel refueling mechanism, the valve body holding ring forming the valve seat of the valve body is held by the ring holding ring formed by expanding the diameter of the cylinder end portion of the pipe holding cylinder mounted on the filler pipe. Therefore, the filler pipe itself does not need to be configured for attaching the valve body. Further, the valve body only needs to be able to open and close the fuel flow path, and its shape can be simplified. Therefore, according to this form of the fuel refueling mechanism, the shape of the filler pipe having the fuel flow path for guiding the fuel to the fuel tank is not complicated, and the valve body is used as a single body to reduce the inflow resistance of the fluid. It can be reduced.
(2) In the fuel refueling mechanism of the above embodiment, the check valve has the valve body so that the valve body rotates about a rotation shaft pivotally supported by the valve body holding ring. You may. In this way, the check valve having a valve function can be easily arranged at the opening of the fuel flow path by axially supporting the rotation shaft by the valve body holding ring held by the ring holding ring. Further, the backflow of fuel can be suppressed by a simple valve configuration in which the valve body rotates about the rotation shaft.
(3) In the fuel refueling mechanism of the above embodiment, the pipe holding cylinder is mounted on the filler pipe over the filler pipe mounting area in the pipe connecting body for mounting the filler pipe on the fuel tank. May be good. In this way, the strength of the installed filler pipe can be ensured after the filler pipe is installed via the pipe connecting body.

The present invention can be realized in various aspects. For example, it can be realized in the form of a fuel tank having a fuel refueling mechanism, the form of a filler neck having a fuel refueling mechanism, a method of manufacturing a fuel refueling mechanism, and the like.

It is explanatory drawing which shows the outline of the fuel refueling mechanism which concerns on embodiment of this invention. It is explanatory drawing which shows the peripheral structure of the tip part of a breather pipe in association with a filler pipe. It is explanatory drawing which shows the state of holding a breather pipe in cross-sectional view in the plane orthogonal to the flow path axis. It is explanatory drawing explaining the assembly process of the tip part and the holding process of a breather pipe. It is sectional drawing which shows the main part structure of the fuel refueling mechanism enlarged in the state which attached to the fuel tank.

FIG. 1 is an explanatory diagram showing an outline of a fuel refueling mechanism 10 according to an embodiment of the present invention. The fuel refueling mechanism 10 sends the fuel refueled from the refueling gun (not shown) to the fuel tank FT, and includes a filler pipe 20 and a breather pipe 30. The filler pipe 20 has a fuel flow path 21 that guides fuel from a fuel gun inserted into a filler neck (not shown) to the fuel tank FT, and is connected to the fuel tank FT via a pipe connecting body 50 described later on the lower end side of the pipe. It will be installed. The filler pipe 20 is connected to a filler neck (not shown) on the upper end side of the pipe, and is bent along the refueling path from the filler neck to the fuel tank FT. The filler pipe 20 is a so-called bellows-shaped pipe body at an appropriate portion including a curved portion, and the fuel flow path 21 is opened and closed by a check valve 63 at the end of the pipe in the tank.

The breather pipe 30 is housed in the filler pipe 20, and the tip portion 40 described later is projected from the fuel flow path 21 into the fuel tank FT. The breather pipe 30 guides the steam in the tank from the tip portion 40 to the fuel flow path 21 on the upstream side of the filler pipe 20 in the refueling process. The breather pipe 30 is held by the filler pipe 20 on the side of the tip portion 40 and the side of the upstream end 33 of the pipe main body 31. The accommodation position of the breather pipe 30 in the filler pipe 20 is the upper end side of the filler pipe in cross section orthogonal to the fuel flow path 21 on the side of the tip portion 40. The upstream end 33 is located at a position higher than the full tank liquid level FL1 described later in the fuel tank FT. A liquid seal 32 is used to hold the breather pipe 30 on the upstream end 33 side. The holding of the breather pipe 30 on the side of the tip portion 40 will be described later.

FIG. 2 is an explanatory view showing the peripheral configuration of the tip portion 40 of the breather pipe 30 in association with the filler pipe 20. The filler pipe 20 has a pipe accommodating pipe body 22 at the end of the fuel flow path 21, and the pipe accommodating pipe 22 has a check valve holding portion 60. The pipe accommodating pipe body portion 22 has an engaging protrusion 23 on the outer wall of the pipe body. The engaging protrusions 23 are scattered around the flow path shaft 21c of the fuel flow path 21 at a predetermined formation pitch, and the filler pipe 20 is positioned around the flow path shaft 21c with respect to the pipe connecting body 50 described later.

The check valve holding portion 60 has a metal pipe holding cylinder 61 and a check valve 63. The check valve 63 is composed of a valve body holding ring 62 and a valve body 63a, and the valve body holding ring 62 and the valve body 63a are molded products of an oil resistant resin. The pipe holding cylinder 61 has a ring holding ring 61b at the end of the pipe. The ring holding ring 61b is formed by expanding the diameter at the cylinder end portion of the pipe holding cylinder 61, and holds the valve body holding ring 62 described later. The state of holding the valve body holding ring 62 and the state of incorporating the check valve holding portion 60 into the filler pipe 20 will be described later, including the state of positioning around the flow path shaft 21c of each member.

The valve body holding ring 62 includes an outer ring ring 62a that is surrounded and held by the ring holding ring 61b, a valve seat ring 62b having a diameter smaller than that of the outer ring ring 62a, a valve body supporting arm 62c, and a valve seat concave wall portion 62d. Have. Each part of the outer ring 62a and the like is integrally molded using an oil resistant resin. The valve seat ring 62b and the valve seat concave wall portion 62d are so-called flush surfaces as inclined surfaces inclined to the flow path shaft 21c so that the vertically lower side is thicker than the upper side, and the valve seat of the valve body 63a. 62f is formed so as to be inclined with respect to the vertical direction. The check valve 63 includes a valve body 63a that abuts on the valve seat 62f formed by the valve seat ring 62b and the valve seat ring 62b, and a pair of rotating shafts 63b for rotatably holding the valve body 63a. Is provided as one. The valve body support arm 62c of the valve body holding ring 62 pivotally supports the rotation shaft 63b of the check valve 63. The valve seat concave wall portion 62d is recessed from the outer shell of the outer ring ring 62a toward the flow path shaft 21c, and the pipe main body 31 enters the pipe holding recess 62e through the recess opening. That is, as shown in FIG. 1, the valve body holding ring 62 holds the tip portion 40 of the breather pipe 30 housed in the filler pipe 20, specifically the pipe connecting arm portion 41b, in the pipe holding recess 62e. FIG. 3 is an explanatory view showing a state of holding the breather pipe 30 in a cross-sectional view on a plane orthogonal to the flow path axis 21c.

The pipe holding recess 62e is a recessed recess wider than the diameter of the pipe body 31 of the breather pipe 30, and the recessing depth from the arcuate line of the outer ring 62a is deeper than the diameter of the pipe body 31. .. Therefore, as shown in FIG. 3, the breather pipe 30 is held in the pipe holding recess 62e so that the pipe outer shell of the pipe main body 31 fits in the arcuate line of the outer shell of the outer ring ring 62a. That is, even when the valve body holding ring 62 is held in the pipe holding cylinder 61, the breather pipe 30 can be accommodated in the filler pipe 20 so that the pipe main body 31 is held in the pipe holding recess 62e.

The pipe holding cylinder 61 holds the valve body holding ring 62 by the outer ring ring 62a so that the pipe holding recess 62e is located vertically above the flow path shaft 21c. As a result, the positional relationship of the pipe holding recess 62e is defined, so that the pipe holding recess 62e that holds the pipe body 31 is positioned with respect to the pipe holding cylinder 61 around the flow path shaft 21c of the fuel flow path 21. Will be. Further, when the pipe holding cylinder 61 holding the valve body holding ring 62 is press-fitted into the pipe accommodating pipe body portion 22, the pipe holding recess 62e holding the pipe body 31 also has a flow path shaft with respect to the filler pipe 20. It is positioned around 21c. The procedure for holding the pipe body 31 to the pipe holding recess 62e and the procedure for assembling the pipe holding cylinder 61 holding the valve body holding ring 62 will be described later. When holding the valve body holding ring 62, the valve body holding ring 62 may be caulked and fixed by the outer ring ring 62a.

The check valve 63 includes a valve body 63a as an integrally molded product of an oil-resistant resin, and the valve body 63a has a notch recess 63c. The check valve 63 is inclined with respect to the vertical direction, and the valve body 63a is brought into contact with the valve seat 62f formed by the valve seat ring 62b and the valve seat concave wall portion 62d by its own weight to allow the fuel flow. Road 21 is closed. In the refueling process, the check valve 63 opens the fuel flow path 21 when the valve body 63a is pushed by the fuel to be refueled. Further, when the check valve 63 is submerged in the fuel, it is pushed by the fuel of the fuel tank FT to bring the valve body 63a into contact with the valve seat 62f and close the fuel flow path 21. The notch recess 63c is formed by cutting out the valve body 63a from the side of the rotating shaft 63b, and the check valve 63 is formed by the notch recess 63c so that the valve body 63a is formed by the pipe holding recess as shown in FIG. It does not interfere with the breather pipe 30 held at the place 62e. The check valve 63 rotates the valve body 63a around a rotation shaft 63b pivotally supported by the valve body support arm 62c of the valve body holding ring 62, and the valve body 63a is also rotated in the process of this rotation. It does not interfere with the breather pipe 30 held in the pipe holding recess 62e. The rotation of the valve body 63a ends when the notch 63c contacts the pipe connecting arm 41b, and at this point, the check valve 63 fully opens the fuel flow path 21. Therefore, in the subsequent refueling process, the fuel is sent to the fuel tank FT without any trouble. The procedure for assembling the check valve 63 will also be described later. The valve seat 62f may be used as a valve seat orthogonal to the flow path shaft 21c so that the check valve 63 is separated from the valve seat 62f when the fuel is not supplied.

As shown in FIG. 2, the breather pipe 30 includes a tip portion 40 at the end of the pipe body 31. The tip portion 40 is configured separately from the pipe main body 31 that guides the steam in the tank to the fuel flow path 21, and is assembled to the pipe main body 31. The tip portion 40 has a pipe connecting portion 41, a first tip portion 42, and a second tip portion 43 from the side of the pipe main body 31. The pipe connecting portion 41 has a connecting portion main body 41a and a pipe connecting arm portion 41b, and each portion is integrally molded using an oil resistant resin. The pipe connection arm portion 41b is configured as a large number of arms continuous from the connection portion main body 41a, and surrounds the arm portion through hole 41e continuous with the through hole 41c of the pipe connection portion 41. The pipe connecting arm portion 41b includes a pipe buried portion 41d at the tip thereof. When the pipe connecting arm 41b is inserted into the pipe flow path 31a of the pipe main body 31 to a fixed position, the pipe buried portion 41d is buried in the pipe wall of the pipe main body 31 to form the pipe connecting portion 41 into the pipe main body. Positioning is performed around the axis of the pipe flow path shaft 31b of 31.

The first tip portion 42 and the second tip portion 43 are integrally molded products using an oil resistant resin. The first tip portion 42 is inserted into the through hole 41c of the pipe connecting portion 41 and is integrated with the pipe connecting portion 41 by adhesive or heat welding. The first tip portion 42 has a first breather flow path 42a over the conduit body portion of the first tip portion 42, and has an engaging convex portion 44 on the outer peripheral wall. The engaging convex portions 44 are scattered around the first breather flow path 42a of the first tip portion 42. The pipe connecting portion 41 into which the first tip portion 42 is inserted and integrated is provided with a groove-shaped engaging recess 41f in the through hole 41c at the same pitch as the engaging convex portion 44. Therefore, since the engaging convex portion 44 engages with the engaging concave portion 41f with the insertion of the first tip portion 42 into the through hole 41c, the engaging convex portion 44 is the first with respect to the pipe connecting portion 41. The tip portion 42 and the second tip portion 43 are positioned around the flow path axis of the first breather flow path 42a.

The second tip portion 43 is continuously formed on the first tip portion 42, and has a second breather flow path 43a over the conduit body portion thereof. The second breather flow path 43a is continuous with the first breather flow path 42a of the first tip portion 42, and the state thereof will be described later. In addition, the first tip portion 42 has a valve seat forming portion 45 and a drainage hole 46 that penetrates the valve seat forming portion 45 and reaches the first breather flow path 42a at a continuous portion with the second tip portion 43. And an on-off valve 47 that opens and closes the drainage hole 46, and a valve body support arm 48 that rotatably supports the on-off valve 47. The valve seat forming portion 45 and the valve body support arm 48 are integrally formed with the first tip portion 42. The on-off valve 47 is a molded product in which a valve body 47a and a rotating shaft 47b are integrally molded using an oil-resistant resin having a lighter specific gravity than fuel. Then, the on-off valve 47 rotates about the rotating shaft 47b when the rotating shaft 47b is pivotally supported by the valve body support arm 48, and opens and closes the drainage hole 46. That is, the on-off valve 47 is driven (rotated) about the rotation shaft 47b by its own weight to separate from the valve seat 45a of the valve seat forming portion 45 and open the drainage hole 46. On the other hand, in the refueling process, the drainage hole 46 is closed by receiving buoyancy from the fuel that has reached the periphery of the valve seat forming portion 45. The state of opening and closing the drainage hole 46 by the on-off valve 47 will be described later together with the state of assembly to the fuel tank FT.

Next, a procedure for obtaining the fuel refueling mechanism 10 in which the breather pipe 30 is housed in the filler pipe 20 will be described. In order to obtain such a fuel refueling mechanism 10, first, the filler pipe 20 is formed into a short straight tubular pipe having a contracted bellows portion. Then, the pipe body 31 of the breather pipe 30 is fixed to the filler pipe 20 via the liquid seal 32 on the upstream end 33 side thereof. As a result, the pipe body 31 of the breather pipe 30 is housed in the filler pipe 20. At this time, the upstream end 33 is fixed via the liquid seal 32 so that the upstream end 33 is above the full tank liquid level FL1 in the assembled state of the fuel refueling mechanism 10 to the fuel tank FT. In this state, the pipe body 31 projects the end of the pipe from the pipe accommodating pipe body 22 of the filler pipe 20. If the breather pipe 30 is in a form in which the pipe body 31 is bent in advance by a predetermined path, the filler pipe 20 is also bent in advance in the accommodation range of the breather pipe 30 following the path of the pipe body 31.

Next, a process of holding the breather pipe 30 by the valve body holding ring 62 of the check valve holding portion 60 and a process of assembling the tip portion 40 to the pipe body 31 already housed in the short and straight tubular filler pipe 20 are performed. .. FIG. 4 is an explanatory diagram illustrating an assembly process of the tip portion 40 and a holding process of the breather pipe 30.

As shown in FIG. 4, in the holding process of the breather pipe 30, the process P10 for pivotally supporting the rotation shaft 63b of the valve body 63a to the valve body holding ring 62 and the valve body holding ring 62 for ring holding of the pipe holding cylinder 61. The process P11 of holding / fixing the valve body holding ring 62 and the process P12 of pressing / fixing the pipe holding cylinder 61 holding / fixing the valve body holding ring 62 to the pipe accommodating pipe body portion 22 of the filler pipe 20 are executed. Before the process P10 is performed, the breather pipe 30 is temporarily held so as to be located substantially above the flow path axis 21c of the fuel flow path 21 in the filler pipe 20 in the vertical direction.

In the process P11, the valve body holding ring 62 is temporarily contracted in the width direction so that the distance between the pipe holding recesses 62e is narrowed, and in this state, the outer ring 62a of the valve body holding ring 62 is held by the ring of the pipe holding cylinder 61. Insert into ring 61b. Next, the shrinkage of the valve body holding ring 62 in the width direction is released. As a result, the valve body holding ring 62 is held and fixed by the ring holding ring 61b on the outer ring 62a in a state where the outer ring 62a is in close contact with the inner peripheral wall surface of the ring holding ring 61b. In this case, the ring holding ring 61b may be provided with a built-in mark of the valve body holding ring 62 so that the pipe holding recess 62e can be positioned with respect to the pipe holding cylinder 61. The process P12 is performed in a state where the pipe body 31 projects from the pipe accommodating pipe body 22 of the filler pipe 20 on the upper side in the vertical direction with respect to the flow path shaft 21c, and the pipe body 31 is projected. , The valve body holding ring 62 is inserted into the pipe holding recess 62e and held in the pipe holding recess 62e. Further, in the process P12, the pipe holding cylinder 61 is press-fitted and fixed to the pipe accommodating pipe body portion 22 in a state where the pipe main body 31 is already held in the pipe holding recess 62e. As a result, the check valve holding portion 60 positions and fixes the pipe main body 31 with respect to the filler pipe 20 around the flow path shaft 21c while being held by the valve seat concave wall portion 62d.

As shown in FIG. 4, in the process of assembling the tip portion 40 to the pipe body 31, the process P20 for pivotally supporting the rotation shaft 47b of the on-off valve 47 to the valve body support arm 48 and the first tip portion 42 are connected by a pipe. The process P21 of press-fitting / fixing into the through hole 41c of the portion 41 and the process P22 of press-fitting / fixing the pipe connecting portion 41 to which the first tip portion 42 has been fixed into the pipe flow path 31a of the pipe main body 31 are executed.

In the process P21, as described above, the first tip portion 42 is press-fitted and fixed to the pipe connecting portion 41 so that the engaging convex portion 44 engages with the engaging concave portion 41f of the pipe connecting portion 41. As a result, the valve seat forming portion 45 having the first tip portion 42, the second tip portion 43 continuous thereto, and the drainage hole 46 has the arm portion through hole 41e with respect to the pipe buried portion 41d of the pipe connecting portion 41. It is positioned around and fixed to the pipe connection 41. Further, in the process P22, the pipe connecting portion 41 in which the first tip portion 42, the second tip portion 43, and the valve seat forming portion 45 are positioned and fixed is the pipe of the pipe body 31 in which the pipe buried portion 41d is the breather pipe 30. By expanding the wall and burying it in the expanded portion, the wall is positioned around the axis of the pipe flow path shaft 31b of the pipe body 31. In this way, the tip portion 40 including the first tip portion 42 is positioned and assembled to the breather pipe 30. In this case, the pipe body 31 of the breather pipe 30 has a bellows shape around the built-in portion of the pipe buried portion 41d, and by engaging the pipe buried portion 41d with the bellows-shaped portion, the pipe connecting portion 41 becomes the pipe main body 31. It may be fixed to. Since the pipe body 31 has already been positioned around the flow path shaft 21c of the filler pipe 20 by the check valve holding portion 60, each part of the tip portion 40 is positioned around the flow path shaft 21c of the filler pipe 20. Then, it becomes one with the filler pipe 20. That is, by the process P22, the breather pipe 30 having the tip portion 40 at the end of the pipe is housed in the filler pipe 20, and the fuel refueling mechanism 10 in which the filler pipe 20 and the breather pipe 30 are integrated is obtained. The fuel refueling mechanism 10 thus obtained is treated as a finished product and assembled to the fuel tank FT using the pipe connecting body 50.

FIG. 5 is a cross-sectional view showing an enlarged view of the main configuration of the fuel refueling mechanism 10 in a state of being mounted on the fuel tank FT. In addition, in FIG. 5, the appropriate portion is shown in end-view view.

The pipe connecting body 50 used for assembling the fuel refueling mechanism 10 to the fuel tank FT has a connecting flange 51, a welding leg 52, and a pipe holding pipe 53. Each part of the connection flange 51 and the like is integrally molded using an oil-resistant resin capable of heat welding. The welding leg 52 is an annular body protruding from the lower surface of the connecting flange 51, and is heat-welded to the fuel tank FT in a state of being in contact with the wall surface of the fuel tank FT. Further, the welded leg 52 has a leg convex portion 54 on a partial portion, for example, on the upper side in the vertical direction shown in FIG. The leg convex portion 54 enters the bottomed hole FTh formed by being depressed in the tank outer wall of the fuel tank FT as the fuel refueling mechanism 10 is assembled to the fuel tank FT. The leg convex portion 54 positions the fuel refueling mechanism 10 with respect to the fuel tank FT by entering the bottomed hole FTh. The state of this positioning will be described later in association with the assembly of the fuel refueling mechanism 10 to the fuel tank FT.

The pipe holding pipe 53 is a tubular body protruding from the connecting flange 51, and holds the fuel refueling mechanism 10 in a liquid-tight manner in the pipe accommodating pipe body portion 22 of the filler pipe 20. The pipe holding pipe 53 has an engaging hole 55 on the wall surface. The engagement hole 55 is formed so as to match the formation pitch of the engagement projection 23 that the filler pipe 20 has in the pipe accommodating pipe body portion 22. Therefore, the filler pipe 20 of the fuel refueling mechanism 10 is inserted into the pipe holding pipe 53 from the side of the tip portion 40, and the engaging projection 23 of the pipe accommodating pipe body portion 22 of the filler pipe 20 is the engaging hole 55 of the pipe holding pipe 53. The filler pipe 20 in which the breather pipe 30 is housed is positioned around the flow path shaft 21c with respect to the pipe connecting body 50, and is also positioned along the axial direction of the flow path shaft 21c. To. In this case, the tip portion 40 has been positioned and assembled on the breather pipe 30 as described above. Therefore, as the engaging projection 23 engages with the engaging hole 55 of the pipe holding pipe 53, the tip portion 40 is positioned around the flow path shaft 21c with respect to the pipe connecting body 50. An O-ring 25 is already attached to the outer periphery of the pipe accommodating pipe body 22 before the filler pipe 20 is inserted into the pipe holding pipe 53. Therefore, the filler pipe 20 is positioned as described above and then liquid-tightly assembled to the pipe connecting body 50. By assembling the filler pipe 20, the fuel refueling mechanism 10 is integrated with the pipe connecting body 50 and is handled by a tank-mounted worker or a tank-mounted device.

Assembling the fuel refueling mechanism 10 to the fuel tank FT can be performed by handling the fuel refueling mechanism 10 integrated with the pipe connecting body 50, and also handling the pipe connecting body 50 and the fuel refueling mechanism 10 individually. It is also possible to do it. When handling the fuel refueling mechanism 10 integrated with the pipe connecting body 50, the assembly is performed as follows. First, the fuel refueling mechanism 10 that has been positioned and assembled in the pipe connecting body 50 as described above is inserted into the tank opening FTa from the side of the tip portion 40. This insertion is performed until the leg convex portion 54 of the pipe connecting body 50 enters the bottom hole FTh of the fuel tank FT and the welding leg 52 of the pipe connecting body 50 comes into contact with the wall surface of the fuel tank FT. Then, the welding legs 52 are heat-welded to the fuel tank FT in a state where the welding legs 52 are in contact with the wall surface of the fuel tank FT. By this heat welding, the assembly of the fuel refueling mechanism 10 to the fuel tank FT is completed. In this case, the pipe connecting body 50 is positioned with respect to the fuel tank FT by the entry of the leg convex portion 54 into the bottomed hole FTh. Further, the fuel refueling mechanism 10 that has been positioned with respect to the pipe connecting body 50 as described above is also positioned with respect to the fuel tank FT.

The assembly when the pipe connecting body 50 and the fuel refueling mechanism 10 are individually handled is as follows. First, the pipe holding pipe 53 of the pipe connecting body 50 is inserted into the tank opening FTa. This insertion is performed until the leg convex portion 54 enters the bottom hole FTh of the fuel tank FT and the welding leg 52 abuts on the wall surface of the fuel tank FT. Then, the welding legs 52 are heat-welded to the fuel tank FT in a state where the welding legs 52 are in contact with the wall surface of the fuel tank FT. The pipe connecting body 50 is positioned with respect to the fuel tank FT by the entry of the leg convex portion 54 into the bottomed hole FTh. Next, the fuel refueling mechanism 10 is inserted into the pipe holding pipe 53 of the pipe connecting body 50 that has been positioned and heat-welded from the side of the tip portion 40, and the engaging protrusion 23 of the pipe accommodating pipe body portion 22 of the filler pipe 20 is inserted. It is engaged with the engagement hole 55 of the pipe holding pipe 53. By engaging the engaging projection 23 with the engaging hole 55, the fuel refueling mechanism 10 is positioned with respect to the fuel tank FT via the pipe connecting body 50 already positioned with respect to the fuel tank FT.

In the fuel refueling mechanism 10 positioned in this way, as shown in FIG. 5, the first breather flow path 42a of the first tip portion 42 in the tip portion 40 is vertical in the fuel tank FT from the tank inner opening of the fuel flow path 21. It extends downward along the direction of intersection. Further, the second breather flow path 43a of the second tip portion 43 continuous with the first tip portion 42 is moved upward from the end of the first breather flow path 42a along the direction intersecting the vertical direction in the fuel tank FT. Extend. Then, the fuel refueling mechanism 10 maintains the posture of the tip portion 40 including the first tip portion 42 by positioning each portion as described above. On top of that, the lowermost end portion 49 is located at the lowermost end portion 49 in the vertical downward direction in the breather flow path 40a extending from the first breather flow path 42a to the second breather flow path 43a. In the fuel refueling mechanism 10 of the present embodiment, the lowermost end portion 49 is a connection portion between the first breather flow path 42a and the second breather flow path 43a. The second breather flow path 43a may extend upward from the end of the first breather flow path 42a along the vertical direction.

The fuel refueling mechanism 10 makes the height of the opening end of the second breather flow path 43a extending upward along the direction intersecting the vertical direction in the fuel tank FT coincide with the full tank liquid level FL1 of the fuel tank FT. ing. Therefore, in the refueling process in which the fuel liquid level FL of the fuel tank FT is lower than the full tank liquid level FL1, the fuel refueling mechanism 10 transfers the steam in the tank from the second breather flow path 43a to the breather pipe 30 via the breather flow path 40a. It is poured into the pipe flow path 31a of the above, and is guided from the pipe flow path 31a to the fuel flow path 21. Further, in the refueling process, the valve body 63a of the check valve 63 is pushed into the tank by the fuel passing through the fuel flow path 21. Therefore, the valve body 63a rotates about the rotation shaft 63b and fully opens the fuel flow path 21 as shown by the alternate long and short dash line in the drawing, whereby the fuel is sent to the fuel tank FT without any trouble. .. In addition, in the refueling process until the fuel liquid level FL reaches the lowermost end portion 49, the valve body 47a of the on-off valve 47 rotates about the rotation shaft 47b due to its own weight, and the two-dot chain line in the figure. As shown by, it hangs down and opens the drainage hole 46.

When refueling progresses and the fuel liquid level FL reaches the valve body 47a where the fuel level FL hangs down, the valve body 47a of the on-off valve 47 receives buoyancy from the fuel in the subsequent refueling process, and the valve seat is centered on the rotation shaft 47b. It rotates toward the valve seat 45a of the forming portion 45. Then, when the fuel liquid level FL reaches the lowermost end portion 49, the valve body 47a of the on-off valve 47 comes into contact with the valve seat 45a and closes the drainage hole 46.

When refueling progresses further and the fuel liquid level FL reaches the full tank liquid level FL1, the second tip portion 43 at the tip portion 40 is submerged in the refueled fuel, and the breather flow path 40a becomes the second breather flow path 43a. Is blocked at. As a result, the internal pressure of the fuel tank FT rises, and the rise in the internal pressure activates the auto stop of the refueling gun to stop refueling.

In the fuel refueling mechanism 10 of the present embodiment described above, the filler pipe 20 having the fuel flow path 21 for guiding the refueled fuel to the fuel tank FT is connected to the breather pipe 30 for guiding the steam in the tank to the fuel flow path 21 in the refueling process. Is housed and both members are integrated. Therefore, according to the fuel refueling mechanism 10 of the present embodiment, it is possible to improve the convenience of handling including the work of mounting the fuel tank FT.

In the fuel refueling mechanism 10 of the present embodiment, the valve body holding ring 62 forming the valve seat 62f of the valve body 63a has a cylinder end portion of the pipe holding cylinder 61 of the check valve holding portion 60 mounted on the filler pipe 20. It is held by a ring holding ring 61b formed by expanding the diameter. Therefore, according to the fuel refueling mechanism 10 of the present embodiment, the filler pipe 20 itself does not need to be configured for attaching the valve body. Further, the valve body 63a only needs to be able to open and close the fuel flow path 21, and its shape can be simplified. Therefore, according to the fuel refueling mechanism 10 of the present embodiment, the shape of the filler pipe 20 having the fuel flow path 21 for guiding the fuel to the fuel tank FT is not complicated, and the valve body 63a is used as a single body. , It is possible to reduce the inflow resistance of the fluid. Further, since the valve body holding ring 62 is caulked and held by the ring holding ring 61b, the holding strength can be increased.

In the fuel refueling mechanism 10 of the present embodiment, the check valve 63 has only a configuration in which the valve body 63a can rotate about the rotation shaft 63b pivotally supported by the valve body holding ring 62. Therefore, according to the fuel refueling mechanism 10 of the present embodiment, the check valve 63 having a valve function can be easily provided by pivotally supporting the rotation shaft 63b by the valve body holding ring 62 held by the ring holding ring 61b. It can be arranged at the opening of the fuel flow path 21. Further, the backflow of fuel can be suppressed by a simple valve configuration in which the valve body 63a rotates about the rotation shaft 63b.

In the fuel refueling mechanism 10 of the present embodiment, the pipe holding cylinder 61 is a metal tubular body, and the pipe accommodating pipe of the filler pipe 20 extends over the mounting area of the filler pipe 20 via the pipe connecting body 50. It is fitted in the body part 22. Therefore, according to the fuel refueling mechanism 10 of the present embodiment, the strength of the mounted filler pipe 20 can be ensured after the filler pipe 20 is mounted via the pipe connecting body 50.

In the fuel refueling mechanism 10 of the present embodiment, since the tip 40 of the breather pipe 30 protrudes inside the fuel tank FT, the refueled fuel may remain in the breather flow path 40a at the tip 40. However, when fuel consumption progresses and the fuel liquid level FL falls below the lowermost end portion 49 in the breather flow path 40a, in the fuel refueling mechanism 10 of the present embodiment, the valve body 47a of the on-off valve 47 provided at the lowermost end portion 49 Rotates around the rotation shaft 47b due to its own weight to open the drainage hole 46. Therefore, even if the fuel remains in the breather flow path 40a, all the remaining fuel falls into the tank from the drain hole 46. In this case, since the first breather flow path 42a is inclined downward toward the drainage hole 46, the residual fuel also falls into the tank from the first breather flow path 42a. Therefore, new refueling is performed in a state where there is no fuel in the breather flow path 40a of the tip portion 40, so that according to the fuel refueling mechanism 10 of the present embodiment, steam discharge in the refueling process can be ensured.

In the fuel refueling mechanism 10 of the present embodiment, when the fuel liquid level FL reaches the lowermost lower end portion 49 in the refueling process, the valve body 47a of the on-off valve 47 that has opened the drainage hole 46 until then has the lowermost lower end portion. Driven by the buoyancy received from the fuel that has reached 49, the drain hole 46 is closed. Therefore, according to the fuel refueling mechanism 10 of the present embodiment, the fuel can be prevented from entering the breather flow path 40a from the drain hole 46 in the refueling process, so that steam discharge in the refueling process can be more reliably ensured.

In the fuel refueling mechanism 10 of the present embodiment, the tip portion 40 is prepared separately from the pipe body 31 that guides the steam in the tank to the fuel flow path 21, and the tip portion 40 of this separate body is the pipe body. It is assembled to 31. As shown in FIG. 5, the second tip portion 43 of the tip portion 40 extends from the first tip portion 42 in an upward direction along a direction that continuously intersects in the vertical direction, and is filled with refueling fuel. The position FL1 is specified. Therefore, the full tank liquid level FL1 can be adjusted by changing the length of the second tip portion 43 and the degree of inclination with respect to the first tip portion 42. Therefore, if the tip 40 having a different flow path length and inclination of the second breather flow path 43a is prepared and the prepared tip 40 is used properly according to the full tank liquid level FL1, a fuel tank having various tank specifications can be used. The fuel refueling mechanism 10 of the present embodiment can be applied to the fuel, and the versatility is enhanced.

Other embodiments:
In the above embodiment, the drainage hole 46 is provided at the lowermost end portion 49 in the vertical direction in the breather flow path 40a, but the drainage hole 46 may be other than the lowermost end portion 49. For example, in the first breather flow path 42a of the first tip portion 42 shown in FIG. 5, a drainage hole 46 and an on-off valve 47 may be provided near the substantially center of the flow path. Although the drainage hole 46 provided near the substantially center of the first breather flow path 42a is not the lowermost end portion 49, but is the lower end portion in the vertical downward direction of the breather flow path 40a, fuel is supplied to the breather flow path 40a. Even if it remains, most of the remaining fuel is dropped into the tank from the drain hole 46. Therefore, in the fuel refueling mechanism 10 in which the drainage hole 46 and the on-off valve 47 are provided near the substantially center of the first breather flow path 42a, the first tip portion 42 and the second tip portion 43 are slightly connected to each other. Only fuel can remain, and the residual fuel does not block the breather flow path 40a. As a result, even with the fuel refueling mechanism 10 in which the drainage hole 46 and the on-off valve 47 are provided near the substantially center of the first breather flow path 42a, new refueling is applied to the breather flow path 40a at the tip portion 40. It can be executed in almost no state, and steam discharge in the refueling process can be ensured.

In the above embodiment, the drainage hole 46 is opened and closed by the on-off valve 47, but the drainage hole 46 may be provided without the on-off valve 47. Even in the fuel refueling mechanism 10 of this form, if the refueled fuel remains in the breather flow path 40a at the tip portion 40, the remaining fuel is consumed and the fuel liquid level FL is the lowermost portion. When it falls below 49, it is dropped into the tank through the drain hole 46. Therefore, since the new refueling is performed in a state where there is almost no fuel in the breather flow path 40a of the tip portion 40, the fuel refueling mechanism 10 having only the drainage hole 46 also secures steam discharge in the refueling process. be able to.

In the fuel refueling mechanism 10 having only the drainage hole 46, fuel can enter the breather flow path 40a from the drainage hole 46 in the refueling process. However, the amount of fuel entering from the fuel flow path 21 of the filler pipe 20 into the fuel tank FT is much larger than the amount of fuel entering from the drainage hole 46 into the breather flow path 40a. Therefore, the refueled fuel submerges the second tip portion 43 in the tip portion 40 before the fuel that has entered the breather flow path 40a through the drainage hole 46 is stored so as to block the breather flow path 40a. Due to this submersion, the internal pressure of the fuel tank FT rises, and the rise in the internal pressure activates the auto stop of the refueling gun to stop refueling. Due to this refueling stop, the fuel is not refueled after that, so that the fuel does not flow from the second breather flow path 43a into the breather flow path 40a, and the breather flow path 40a is not blocked by the fuel. As a result, even the fuel refueling mechanism 10 having only the drainage hole 46 does not hinder the steam discharge in the refueling process.

In the above embodiment, the filler pipe 20 is formed to accommodate the breather pipe 30, but the present invention is not limited to this. That is, after the breather pipe 30 is separated from the filler pipe 20, one end side of the pipe is attached to the ceiling wall of the fuel tank FT, and the other end side is connected to the filler neck of the filler pipe 20. In such a case, the valve body 63a that opens and closes the fuel flow path 21 is a disk-shaped valve body that does not have the notch recess 63c, and the valve body holding ring 62 is the valve seat concave wall portion 62d and the pipe holding recess. It may be an annular body that does not have 62e.

The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations within a range not deviating from the gist thereof. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the column of the outline of the invention may be used to solve some or all of the above-mentioned problems. , It is possible to replace or combine as appropriate in order to achieve some or all of the above effects. Further, if the technical feature is not described as essential in the present specification, it can be appropriately deleted.

10 ... Fuel refueling mechanism, 20 ... Filler pipe, 21 ... Fuel flow path, 21c ... Flow path shaft, 22 ... Pipe accommodating pipe body, 23 ... Engagement protrusion, 25 ... O ring, 30 ... Breather pipe, 31 ... Pipe Main body, 31a ... Pipe flow path, 31b ... Pipe flow path shaft, 32 ... Liquid seal, 33 ... Upstream end, 40 ... Tip part, 40a ... Breather flow path, 41 ... Pipe connection part, 41a ... Connection part main body, 41b ... Pipe connection arm, 41c ... through hole, 41d ... pipe buried part, 41e ... arm part through hole, 41f ... engaging recess, 42 ... first tip, 42a ... first breather flow path, 43 ... second tip , 43a ... Second breather flow path, 44 ... Engagement convex portion, 45 ... Valve seat forming portion, 45a ... Valve seat, 46 ... Drainage hole, 47 ... Open / close valve, 47a ... Valve body, 47b ... Rotating shaft, 48 ... Valve body support arm, 49 ... Lowermost part, 50 ... Pipe connection body, 51 ... Connection flange, 52 ... Welding leg, 53 ... Pipe holding pipe, 54 ... Leg convex part, 55 ... Engagement hole, 60 ... Reverse Valve holding part, 61 ... Pipe holding cylinder, 61b ... Ring holding ring, 62 ... Valve body holding ring, 62a ... Outer ring ring, 62b ... Valve seat ring, 62c ... Valve body support arm, 62d ... Valve seat concave wall part, 62e ... Pipe holding recess, 62f ... Valve seat, 63 ... Check valve, 63a ... Valve body, 63b ... Rotating shaft, 63c ... Notch recess, FL ... Fuel level, FL1 ... Full tank level, FT ... Fuel tank, FTa ... Tank opening, FTh ... Bottomed hole

Claims (3)

It is a fuel refueling mechanism (10)
A filler pipe (20) having a fuel flow path for guiding the refueled fuel to the fuel tank (FT) and mounted on the fuel tank (FT).
A check valve (63) having a valve body (63a) that opens and closes the fuel flow path (21) and a valve body holding ring (62) that forms a valve seat (62f) of the valve body (63a).
A check valve holding portion (60) for holding the check valve (63) so that the valve seat (62f) is located at the opening of the fuel flow path (21) is provided.
The check valve holding portion (60) is
On the opening side of the fuel flow path (21), a pipe holding cylinder (61) mounted on the filler pipe (20) and
The pipe end portion of the pipe holding cylinder (61) is formed with an enlarged diameter, and has a ring holding ring (61b) for holding the valve body holding ring (62) in the opening of the fuel flow path (21). Fuel refueling mechanism (10). The fuel refueling mechanism (10) according to claim 1.
The check valve (63) has a valve body (63a) so that the valve body (63a) rotates about a rotation shaft (63b) pivotally supported by the valve body holding ring (62). Fuel refueling mechanism (10). The fuel refueling mechanism (10) according to claim 2.
The fuel refueling mechanism (10), wherein the pipe holding cylinder is mounted on the filler pipe over the filler pipe mounting area in the pipe connecting body for mounting the filler pipe on the fuel tank.

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