JP2020050235A - Opening/closing device for fuel tank - Google Patents

Abstract

To suppress protrusion of an outer body to an outside of a device while securing liquid discharge property of an opening/closing device for a fuel tank.SOLUTION: A housing for surrounding a nozzle insertion passage comprises a first opening for opening the nozzle insertion passage into atmosphere, a cover body in which the housing is incorporated comprises a nozzle insertion hole and a second opening which is opened into atmosphere and faces the first opening. In addition, a liquid discharge mechanism attached to the housing comprises on a recess wall of a liquid discharge hole formation member attached to the first opening, a recess which becomes dent on the first opening side and protrudes to a center axis side of the nozzle insertion hole from the first opening side, and is continuous to the second opening, and has a liquid discharge hole for a liquid flowing from the nozzle insertion passage to the first opening. A liquid discharge valve having a rotary axis and a valve body are held to the recess wall to open and close the liquid discharge hole by rotation of the valve body around a rotary axis as a base point, on the recess.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fuel tank opening / closing device.

  As described in Patent Document 1, a conventional fuel tank opening / closing device includes an opening / closing valve in a drain passage that communicates a fuel passage with the outside of the device. In Patent Literature 1, the drainage path is normally closed by an on-off valve to prevent intrusion of dust and the like from the outside. Further, when liquid such as rainwater enters the fuel passage, the entered liquid is discharged to the outside by opening the inside of the opening / closing device by an opening / closing valve.

JP 2017-114272 A

  In the fuel tank opening / closing device described in Patent Literature 1, the portion where the drainage passage is formed protrudes outward from the outer body, and the projecting portion is exposed in a fueling chamber in which the opening / closing device is mounted. Due to restrictions on the installation space of the opening / closing device in the vehicle's refueling chamber and restrictions on the external design that can be visually recognized by the user each time refueling is performed, it is possible that the formation portion of the drainage passage cannot be significantly protruded from the outer body. On the other hand, if the protrusion of the drainage path formation portion is suppressed, the drainage performance may be reduced. For these reasons, it has been demanded to suppress the protrusion of the outer body while ensuring drainage.

  The present invention can be realized as the following modes.

(1) According to one embodiment of a fuel tank opening / closing device, a fuel tank opening / closing device is provided. The fuel tank opening and closing device includes a housing having a passage peripheral wall formed so as to surround a nozzle insertion passage of a refueling nozzle, a first opening formed in the passage peripheral wall, and opening the nozzle insertion passage to the atmosphere. A cover body into which a housing is incorporated, the cover body having a peripheral wall formed so as to surround the housing, and a second opening formed in the peripheral wall and open to the atmosphere facing the first opening, and a ceiling of the peripheral wall. A cover main body having a nozzle insertion port for the refueling nozzle on a wall, an insertion port opening / closing mechanism for opening and closing the nozzle insertion port, and a liquid discharging from the nozzle insertion passage positioned between the cover main body and the housing. A drain mechanism for discharging the liquid, wherein the drain mechanism is attached to the first opening, and protrudes from the first opening side toward a center axis side of the nozzle insertion port to open the first opening. A concave wall that continuously forms a concave portion that is depressed on the side with the second opening, and a drain port for liquid that flows from the nozzle insertion passage toward the first opening is formed in the concave wall. A drain valve having a drain port forming member, a rotating shaft and a valve body, wherein in the recess, the drain valve opens and closes the drain port by rotating the valve body about the rotating shaft as a base point, A holding member having a holding piece for holding the rotating shaft with respect to the recess wall.
In the fuel tank opening / closing device according to this aspect, when a fluid flows from the nozzle insertion passage formed by the housing toward the first opening, the liquid reaches a drain port of a drain mechanism between the cover body and the housing. I do. Then, when the drain port is opened by the drain valve, the liquid flows through the recess and flows into the second opening of the cover body facing the first opening of the housing. Since the second opening is formed on the peripheral wall surrounding the housing and is open to the atmosphere, the liquid flowing to the second opening can be drained from the second opening to the outside of the apparatus without any trouble.
The drainage mechanism relating to the liquid drainage from the first opening to the second opening is disposed between the cover main body and the housing incorporated therein, that is, in the installation area of the housing. Therefore, in the cover body serving as the outer body of the opening / closing device for the fuel tank, the second opening that opens to the atmosphere only needs to be formed in the peripheral wall, and it is not necessary to provide a portion where the drainage passage is formed so as to protrude outside the device. In addition to this, in the fuel tank opening / closing device of this embodiment, the drain valve that opens and closes the drain port is held by the holding piece in a concave portion that protrudes from the first opening side toward the center axis side of the nozzle insertion port and is recessed. . As the holding area of the drain valve expands from the first opening side to the cover body side, the installation area of the drainage mechanism expands to the cover body side. In the fuel tank opening / closing device according to this aspect, the drain valve is held in the recessed portion that protrudes toward the center axis of the nozzle insertion port, so that it is possible to suppress the spread of the installation area of the drain mechanism. As a result, according to the fuel tank opening / closing device of this embodiment, the liquid that has entered the nozzle insertion passage can be reliably drained, and the cover body serving as the outer body of the opening / closing device does not protrude outside the device. Or the degree of protrusion can be suppressed more reliably.
(2) In the fuel tank opening and closing device according to the above aspect, the holding piece may hold the rotating shaft at a curved surface portion facing an axial surface of the rotating shaft. With this configuration, the valve body can be smoothly rotated around the rotation axis, so that the drainage property can be improved.
(3) In the fuel tank opening / closing device according to the above aspect, the drain port forming member may move the valve body over the drain port opening such that the rotation shaft does not contact the inner wall surface of the recess wall. You may make it have the pedestal part received by an end surface. With this configuration, the valve body can be more smoothly rotated around the rotation axis as a base point, so that the drainage property can be further improved.

  Note that the present invention can be realized in various modes. For example, the present invention can be realized in the form of a fuel tank having a fuel tank opening / closing device, a filler neck having a fuel tank opening / closing device, or a method of manufacturing a fuel tank opening / closing device.

It is an explanatory view showing an outline of a fueling device including a fuel tank opening and closing device according to an embodiment of the present invention. 1 is a perspective view schematically showing a filler neck in which a fuel tank opening / closing device according to an embodiment is incorporated. It is explanatory drawing which shows the principal part of a filler neck in cross section along line 3-3 in FIG. FIG. 2 is an exploded perspective view of a fuel tank opening / closing device. FIG. 4 is an explanatory view showing a peripheral region of a drainage mechanism in FIG. 3 in an enlarged sectional view. FIG. 4 is an explanatory diagram showing a drainage port forming member constituting the drainage mechanism when viewed from a direction of an arrow A in FIG. 3. FIG. 7 is an explanatory view showing the drainage port forming member viewed from the direction of arrow B in FIG. 6. FIG. 4 is an explanatory diagram showing a drain valve held by a holding member constituting a drain mechanism in a front view from a direction of an arrow A in FIG. 3 and a right side view thereof. FIG. 5 is an explanatory diagram showing a holding member constituting the drainage mechanism as viewed from the direction of arrow C in FIG. 4. FIG. 5 is an explanatory view showing a state of assembling of main parts of the opening / closing device as viewed from a direction of an arrow D in FIG. 4.

  FIG. 1 is an explanatory diagram showing an outline of a refueling device FS including a fuel tank opening / closing device 20 according to an embodiment of the present invention. Refueling device FS is mounted on the vehicle, and guides fuel supplied from refueling nozzle FN to fuel tank FT. 1 and the subsequent figures, an arrow G indicating a vertical direction is described. The refueling device FS includes a filler neck 100, a fuel vapor port 102, a filler pipe FP, a check valve TV, a fuel vapor tube NT, a gas release valve BV, and a mounting member FE. Filler neck 100 is mounted in refueling chamber FR of the vehicle by mounting member FE, and receives insertion of refueling nozzle FN into nozzle insertion port 104. Note that the filler neck 100 may be mounted in the fuel supply chamber FR using a disk-shaped substrate in which a circular hole into which a part of the filler neck 100 is inserted is formed in the center instead of the mounting member FE illustrated. .

  Filler neck 100 is connected to fuel tank FT by filler pipe FP and fuel vapor tube NT. Then, the filler neck 100 guides liquid fuel such as gasoline from a refueling nozzle FN (see FIG. 1) inserted into the nozzle insertion opening 104 to a fuel tank FT connected via a filler pipe FP. The filler pipe FP is, for example, a resin tube having a bellows structure at two places, and can expand and contract and bend in a certain range. The filler pipe FP is connected to the fuel tank FT via a check valve TV. The fuel discharged from the refueling nozzle FN inserted into the nozzle insertion port 104 is guided from the check valve TV to the fuel tank FT through a fuel flow path formed by the filler neck 100 and a filler pipe FP described later. The check valve TV prevents fuel from flowing back from the fuel tank FT to the filler pipe FP.

  One end of the fuel vapor tube NT is connected to the fuel tank FT via the gas release valve BV, and the other end is connected to the fuel vapor port 102 protruding from the filler neck 100. The gas discharge valve BV functions as a joint that connects the fuel vapor tube NT to the fuel tank FT. The air in the tank containing the fuel vapor flows from the gas discharge valve BV into the fuel vapor tube NT. The fuel vapor is guided to the fuel tank FT through the filler pipe FP together with the supplied fuel at the time of refueling from the refueling nozzle FN. Hereinafter, the filler neck 100 will be described in detail.

  FIG. 2 is a perspective view schematically showing a filler neck 100 in which the fuel tank opening / closing device 20 according to the embodiment is incorporated. FIG. 3 is an explanatory diagram showing a cross section of a main part of the filler neck 100 along line 3-3 in FIG. FIG. 4 is an exploded perspective view of the fuel tank opening / closing device 20. In the following description, when describing the positional relationship of the members, the side near the fuel tank FT is appropriately referred to as “fuel tank side”, and the side near the nozzle insertion port 104 is appropriately referred to as “insertion side”. Name. Also, in FIG. 3, for clear illustration of the constituent members, appropriate internal constituent members are shown in a cross-sectional end view.

  As shown in FIGS. 3 and 4, the filler neck 100 includes an insertion opening / closing mechanism 10, an opening / closing device 20, a tank-side opening / closing mechanism 30, and a drainage mechanism 40. The opening / closing device 20 includes an outer body 21 having a nozzle insertion opening 104 into which a refueling nozzle FN (see FIG. 1) is inserted, an inner body 22 having a nozzle insertion passage 100N of the refueling nozzle FN, and a tank-side opening / closing on the fuel tank side. An under body 23 for assembling the mechanism 30 to the inner body 22 and a fuel passage forming portion 25 for forming a fuel passage 100P for guiding the liquid fuel supplied from the refueling nozzle FN to the fuel tank FT are provided. Each body has a substantially cylindrical shape.

  The outer body 21 is a cover body in which the inner body 22 is incorporated, and has a second opening 42 that is open to the atmosphere on a peripheral wall 21 a surrounding the inner body 22. The second opening 42 faces a first opening 41 of the inner body 22 described later. In addition, the outer body 21 has a nozzle insertion opening 104 of the refueling nozzle FN on the ceiling wall 21b of the peripheral wall 21a. The nozzle insertion port 104 is formed such that a tapered nozzle insertion side peripheral wall 104t is continuous with an oil supply port peripheral wall 104s having a substantially circular hole shape. The outer body 21 is a resin molded product using an oil-resistant resin such as PA (polyamide).

  The inner body 22 is a housing having a first opening 41 in a passage peripheral wall 22a surrounding the nozzle insertion passage 100N, and the first opening 41 opens the nozzle insertion passage 100N to the atmosphere. As shown in FIGS. 3 and 4, the inner body 22 has a part of the passage peripheral wall 22 a as a protruding wall part 22 b that protrudes outward along the radial direction of the nozzle insertion passage 100 </ b> N. Then, in the inner body 22, the first opening 41 formed in the protruding wall portion 22b is continuous with the nozzle insertion passage 100N, and the passage peripheral wall 22a on the opening bottom side of the first opening 41 is defined as the inclined wall portion 22c. The inner body 22 has a plurality of ribs between upper and lower flanges of the body in order to reinforce the passage peripheral wall 22a, and has a protruding piece for exerting a holding force on the outer body 21 at a lower flange. Since these members are not directly related to the gist of the present invention, the description is omitted.

  The inclined wall portion 22c has a mounting posture in which the filler neck 100 is already mounted on the vehicle, more specifically, as shown in FIG. 3, a tilting posture inclined at a predetermined inclination angle θ1 (30 to 50 °) with respect to the vertical direction. , The first opening 41 is inclined at least vertically below the nozzle insertion passage 100N side. The function of the inclined wall portion 22c will be described later. The inner body 22 and an underbody 23 described later are resin molded products using an oil-resistant resin such as PA (polyamide). The inclination angle θ1 is the inclination angle of the central axis OL of the nozzle insertion passage 100N or the fuel passage 100P with respect to the vertical direction.

  The insertion opening / closing mechanism 10 is disposed on the ceiling wall 21b side of the outer body 21 and opens and closes the nozzle insertion opening 104. That is, the insertion opening / closing mechanism 10 moves to the insertion opening opening position in accordance with the insertion of the refueling nozzle FN into the nozzle insertion opening 104, opens the nozzle insertion opening 104, and inserts the nozzle when the oil supply nozzle FN is not inserted. The opening bottom of the opening 104 is closed from the nozzle insertion passage 100N side.

  The insertion opening and closing mechanism 10 includes an insertion opening and closing member 11 for opening and closing the nozzle insertion opening 104, an insertion side spring 12 fixed to the inner body 22 and biasing the insertion opening and closing member 11 in a closing direction, and an insertion opening and closing. An annular body 15 attached to the ceiling wall 21b of the outer body 21 so as to surround the member 11; The annular body 15 is a molded product of porous sponge rubber, which reduces the impact applied to the ceiling wall 21b and limits the fuel vapor from flowing to the atmosphere. The insertion opening / closing member 11 is a molded product using a material having a higher hydrophobicity than the outer body 21, for example, PPS (polyphenylene sulfide), and has a central portion formed in a disk shape depressed toward the nozzle insertion passage 100 </ b> N. I have. As shown in FIG. 4, the insertion opening / closing member 11 has a depression 11a on its upper surface. The depression 11a functions as a communication port that communicates the nozzle insertion passage 100N with the atmosphere on the peripheral wall of the nozzle insertion port 104.

  The insertion-side spring 12 is fixed to the inner body 22 at a fixed end 12L, and is fixed to the insertion opening / closing member 11 at a free end opposite to the fixed end 12L. The insertion side spring 12 rotates around a fixed end 12L within a predetermined angle range, and urges the insertion opening / closing member 11 in a direction to close the fuel passage 100P. Therefore, the insertion port opening / closing member 11 is pressed against the end face on the lower end side of the opening of the oil supply port peripheral wall 104s in the nozzle insertion port 104 when the fuel supply is not performed, and closes the nozzle insertion port 104. The insertion opening / closing mechanism 10 may be a pair of flap valve types in which the nozzle insertion opening 104 opens and closes left and right or up and down as viewed from the front of the insertion opening when the refueling nozzle FN is inserted.

  In the relationship with the insertion opening / closing member 11 of the insertion opening / closing mechanism 10 described above, the outer body 21 uses the lower end side end surface of the fuel supply opening peripheral wall 104 s as the seating end surface of the insertion opening / closing member 11. The outer body 21 has a communication port 21c on the lower end side end surface of the fuel supply port peripheral wall 104s, as shown in FIG. The communication port 21c is formed by cutting off the lower end side end surface of the fuel supply port peripheral wall 104s. The communication opening 21c overlaps with the recessed recess 11a of the insertion opening / closing member 11 when the insertion opening / closing member 11 of the insertion opening / closing mechanism 10 described above closes the nozzle insertion opening 104, and the recessed recess 11a. At the same time, the nozzle insertion passage 100N communicates with the atmosphere at the peripheral wall of the nozzle insertion port 104. One of the recessed recess 11a and the communication port 21c may be formed, and both may be formed at different positions to individually communicate the nozzle insertion passage 100N with the atmosphere at the peripheral wall of the nozzle insertion port 104. It may be.

  The fuel passage forming portion 25 is assembled to the lower end side of the outer body 21, and connects the fuel passage 100P to the nozzle insertion passage 100N of the inner body 22 with a tank-side opening / closing mechanism 30 described later interposed.

  As shown in FIG. 3, the tank side opening / closing mechanism 30 is disposed at a portion where the fuel passage 100P formed by the fuel passage forming portion 25 and the nozzle insertion passage 100N are continuous, and opens and closes the nozzle insertion passage 100N on the fuel tank side. I do. The member to be assembled in the tank side opening / closing mechanism 30 is the underbody 23, and the underbody 23 is mounted to the outer body 21 and the inner body 22 via a seal member in a liquid-tight and air-tight manner. The tank-side opening / closing mechanism 30 is assembled to the underbody 23 via the fuel passage forming portion 25, and a tank-side opening / closing member 31 that opens and closes the nozzle insertion passage 100N. A tank-side spring 32 for urging the member 31 in the closing direction. The tank side opening / closing member 31 is a flap valve for preventing leakage of liquid fuel from the fuel tank side to the insertion side. The tank-side spring 32 is fixed to the fuel passage forming portion 25 at a fixed end 32L, and is fixed to the tank-side opening / closing member 31 at a free end opposite to the fixed end 32L. The tank-side spring 32 rotates within a predetermined angle range around the fixed end 32L, and urges the tank-side opening / closing member 31 in a direction in which the nozzle insertion passage 100N closes. When the filler neck 100 is already mounted on the vehicle in the inclined posture shown in FIG. 3, the tank-side spring 32 has the fixed end 32L above the free end in the direction of gravity when the tank-side opening / closing mechanism 30 is closed. Are arranged as follows. The tank side opening / closing mechanism 30 includes a pressure adjusting mechanism in the tank side opening / closing member 31, and adjusts the fuel vapor pressure (tank internal pressure) in the fuel tank FT. That is, in the event of an internal pressure abnormality in which the tank internal pressure becomes a positive pressure or a negative pressure than the specified pressure, the tank-side opening / closing mechanism 30 releases the air in the tank to the nozzle insertion passage 100N side, or releases the air from the nozzle insertion passage 100N into the tank. To adjust the tank internal pressure.

  The drainage mechanism 40 is mounted on the inner body 22 so as to be located between the outer body 21 and the inner body 22, and is continuous with the first opening 41 of the inner body 22. As shown in FIG. 4, the drainage mechanism 40 includes, from the inner body 22 side, a rectangular annular seal body 45, a drainage port forming member 46, a drainage valve 47, and a holding member 48. The annular seal body 45 is a molded product made of oil-resistant rubber, and receives the pressing force of the drainage port forming member 46 attached to the first opening 41 of the inner body 22 to move the first opening 41 over the opening area. And seal liquid tightly.

  FIG. 5 is an explanatory view showing a peripheral area of the drainage mechanism 40 in FIG. 3 in an enlarged sectional view. FIG. 6 is an explanatory diagram showing the drainage port forming member 46 constituting the drainage mechanism 40 as viewed from the direction of arrow A in FIG. FIG. 7 is an explanatory diagram showing the drainage port forming member 46 as viewed from the direction of arrow B in FIG. FIG. 8 is an explanatory view showing the drain valve 47 held by the holding member 48 constituting the drain mechanism 40 in a front view from the direction of arrow A in FIG. 3 and a right side view thereof. As shown in FIGS. 3 and 4, the drainage port forming member 46 is attached to the first opening 41. The drainage port forming member 46 thus mounted has a drainage port 46a protruding from the first opening 41 side toward the central axis OL of the nozzle insertion passage 100N and being recessed at the first opening 41 side. The recess wall 46c has a recess area surrounded by the recess from the first opening 41 side as a drain passage 48d continuous with the second opening 42 of the outer body 21. As shown in the sectional view of FIG. 3 and the enlarged sectional view of FIG. 5, the drain port forming member 46 surrounds the drain port 46a with a tapered base 46d. 47c is received at the upper end surface of the opening of the drain port 46a. As shown in the cross-sectional views of FIGS. 3 and 5, constituent members of a holding member 48 described later are also located in the drain passage 48d, and a drain valve 47 described below is held in the recess wall 46c. Therefore, the drainage passage 48d and the recess wall 46c will be described later together with the configuration of the holding member 48 and the drainage valve 47.

  The direction of arrow A in FIG. 3 coincides with the direction of the opening axis orthogonal to the opening surface of the drainage port 46a. Therefore, FIG. 6 shows a front view of the drainage port 46a. As shown in FIG. 6, the drain port 46a is an elliptical opening when viewed from the front.

  As shown in FIG. 8, the drain valve 47 for opening and closing the drain port 46a having an elliptical opening has a rotating shaft 47a and a valve body 47c. The valve body 47c has an elliptical shape when viewed from the front, and the length of a long side parallel to the rotation axis 47a is longer than the length of a short side perpendicular to the rotation axis 47a. The drain valve 47 of the present embodiment is formed such that the length of the long side parallel to the rotation axis 47a is 1.1 to 1.5 times the length of the short side perpendicular to the rotation axis 47a. The valve body 47c is provided. The drain port 46a closed by the valve body 47c of the drain valve 47 is also an elliptical opening corresponding to the elliptical shape of the valve body 47c. The drain port 46a is located at one end of the inner body 22 on the side of the first opening 41 of the inclined wall 22c, and is continuous with the inclined wall 22c. Therefore, the liquid that has entered the nozzle insertion passage 100N is guided from the nozzle insertion passage 100N to the inclined wall portion 22c, flows toward the first opening 41, and reaches the drainage port 46a naturally. Further, the drainage port forming member 46 has a convex portion 46b on the holding member 48 side. The protrusion 46b will be described in relation to a configuration of a holding member 48 described later.

  FIG. 9 is an explanatory diagram showing the holding member 48 constituting the drainage mechanism 40 as viewed from the direction of arrow C in FIG. The holding member 48 has a third opening 43 in the center area of the frame, and has a convex portion 43a at the upper end of the third opening 43 as shown in FIG. Further, the holding member 48 includes two engagement arms 48 a protruding from the frame body of the third opening 43 toward the liquid discharge port forming member 46. The engagement arm 48a has flexibility so that the facing space is widened, and has a pair of elongated engagement holes 48b from the engagement arm base to the distal end side. The engagement arm 48a allows the inner body 22 to enter into the engagement hole 48b around the first opening 41, specifically, a convex engagement protrusion 22d provided on the protruding wall portion 22b surrounding the first opening 41. Then, it engages with this engagement protrusion 22d. That is, since the holding member 48 engages the engagement arm 48a with the engagement protrusion 22d of the inner body 22 as the engagement portion, the engagement arm 48a functions as the engaged portion. The holding member 48 is mounted on the inner body 22 such that the drainage port forming member 46 already mounted on the first opening 41 of the inner body 22 is maintained in this mounted state. Specifically, the holding member 48 is mounted on the inner body 22 so that the engaging protrusion 22d of the inner body 22 is engaged with the engaging hole 48b of the engaging arm 48a. The state of being attached to the opening 41 is maintained. In the present embodiment, the engagement hole 48b is formed so as to cut out the base of the engagement arm 48a. Therefore, in a state where the holding member 48 is mounted on the inner body 22, the above-described protrusion 46 b of the drainage port forming member 46 is engaged with the engagement hole 48 b on the base side of the holding member 48.

  As shown in FIG. 9, the holding member 48 has a pair of holding pieces 48c on the liquid discharge port forming member 46 side. The holding piece 48c is a member for holding a drain valve 47 for opening and closing the drain port 46a of the drain port forming member 46 with respect to the recess wall 46c of the drain port forming member 46. In other words, the holding piece 48c is rotated at the curved surface portion 48e facing the shaft surface of the rotating shaft 47a when the drain port forming member 46 is mounted on the inner body 22 as described above. 47a is held. The rotating shaft 47a has a cylindrical shape on the valve body 47c side, and has a flat portion 47b in which a cylindrical shape is cut out on the opposite side, that is, on the center axis OL side. The holding piece 48c receives the rotating shaft 47a of the drain valve 47 by a curved surface portion 48e on the side of the columnar portion opposite to the flat portion 47b. The curved surface portion 48e is formed such that its curvature is smaller than the curvature of the cylindrical portion of the rotating shaft 47a. The rotation shaft 47a of the drain valve 47 is slidably held along the curved surface portion 48e on the side of the cylindrical portion and serves as a base point for rotation of the valve body 47c. That is, the valve main body 47c is rotatable about the rotation axis 47a. In the course of the rotation of the valve main body 47c, the rotation axis 47a follows the curved surface of the curved surface portion 48e on the side of the columnar portion. Can slide. The rotation shaft 47a is held by the holding piece 48c such that the rotation shaft 47a is positioned closer to the center axis OL of the nozzle insertion passage 100N than the valve body 47c.

  The drain valve 47 incorporated in the concave wall 46c of the drain port forming member 46 and held by the pair of holding pieces 48c closes the drain port 46a by its own weight with the valve body 47c. In this closed state, the valve body 47c of the drain valve 47 is in contact with the upper end surface of the drain port 46a in the tapered pedestal portion 46d as shown in FIG. 5 and 6, when the drain port 46a is closed, the inner peripheral wall 46e of the recess wall 46c is rotated by the rotation axis of the drain valve 47, as shown in FIGS. The recess is formed so as not to contact with 47a. In addition, as shown in FIGS. 5 and 6, the drainage port forming member 46 has a groove 46da on the tapered slope of the pedestal 46d. The groove portion 46da is formed to be depressed at both ends of the drainage port 46a as viewed from the front as shown in FIG. As described above, in connection with the drain valve 47 held by the holding piece 48c, the groove 46da is formed by the tapered slope of the pedestal 46d at both ends in the axial direction of the rotation shaft 47a of the drain valve 47. And the non-contact area of the rotating shaft 47a with the inner peripheral wall 46e of the recess wall 46c is enlarged. Due to the enlargement of the non-contact area, the valve main body 47c pivots around the pivot shaft 47a without any trouble. More specifically, as described above, when the rotating shaft 47a slides along the curved surfaces of the respective curved surface portions 48e of the pair of holding pieces 48c on the columnar portion side, one end side of the rotating shaft 47a. And the other end side may have different sliding situations. In this case, the rotation shaft 47a is inclined such that one end in the axial direction is closer to the tapered slope of the pedestal portion 46d than the other end. Even if the rotating shaft 47a is tilted in this manner, the rotating shaft end, which is closer to the tapered slope of the pedestal portion 46d, does not contact the inner peripheral wall 46e of the recessed wall 46c due to the groove 46da. Therefore, as described above, the valve main body 47c pivots around the pivot shaft 47a without any trouble.

  On the other hand, as described above, when the liquid flows from the nozzle insertion passage 100N to the first opening 41 via the inclined wall portion 22c, the valve body 47c is pushed by the fluid, and the liquid flows around the rotation shaft 47a. Then, the drain port 46a is opened. The drain valve 47, which is pushed by the fluid and opens the drain port 46 a, rotates so that the valve body 47 c approaches the projection 43 a in the third opening 43 of the holding member 48. In other words, the valve main body 47c of the drain valve 47 rotates so that the contact point with the convex portion 43a becomes a rotation end, and the convex portion 43a functions as a stopper of the drain valve 47.

  Further, in a state where the holding member 48 is attached to the inner body 22 as described above so as to hold the liquid discharge port forming member 46, as shown in FIG. The opening 42 is continued. In addition, the holding member 48 moves the above-described recess area of the recess wall 46c between the third opening 43 and the drain port 46a of the drain port forming member 46 to the liquid flowing out of the drain port 46a. A drain passage 48d up to the second opening 42 is provided. In addition, as described above, the holding member 48 has the protrusion 46b of the drainage forming member 46 in the engagement hole 48b in the process of mounting the holding member 48 to the inner body 22. Insert from the tip side. As the attachment of the holding member 48 to the inner body 22 progresses, the protrusion 46b reaches the base of the engagement hole 48b while entering the engagement hole 48b. Thus, the convex portion 46b functions as a positioning portion that determines the attitude of the holding member 48 when the holding member 48 is engaged with the inner body 22. Further, the holding member 48 engages the projection 46b and the engagement protrusion 22d with the engagement hole 48b at different positions in the engagement hole 48b. For this reason, the protrusion 46b and the engagement protrusion 22d can be engaged with one other, and the shape of the holding member 48 can be simplified.

  FIG. 10 is an explanatory view showing a state of assembling the main parts of the opening and closing device 20 as viewed from the direction of arrow D in FIG. As shown in the drawing, the drain port forming member 46 and the holding member 48 are assembled and attached to the inner body 22 as described above with the drain port 46a (see FIG. 4) closed with the drain valve 47. . Then, the inner body 22 is attached to the outer body 21 together with the insertion port opening / closing mechanism 10 and the annular body 15 in a state where the drainage port forming member 46 and the holding member 48 hold the drainage valve 47 and are so-called temporarily assembled. Be incorporated. Specifically, the inner body 22 is incorporated into the outer body 21 such that the third opening 43 of the holding member 48 shown in FIG. 9 overlaps the second opening 42 of the outer body 21. In other words, since it is sufficient that the drain port forming member 46 and the holding member 48 can be temporarily assembled, strict design of strength and the like are not required for these members, and product design can be simplified.

  In the filler neck 100 having the opening / closing device 20 of the present embodiment described above, when a fluid flows from the nozzle insertion passage 100N formed by the inner body 22 toward the first opening 41, the liquid flows into the outer body 21 and the inner body The liquid reaches a drain port 46a of the drain mechanism 40 incorporated between the drain mechanism 22 and the drain 22. In this case, as shown in FIG. 3, the filler neck 100 having the opening / closing device 20 of the present embodiment has a predetermined inclination angle θ1 (30 to 50 °) with respect to the vertical direction in the mounting posture already mounted on the vehicle. The inclined wall portion 22c is inclined such that the first opening 41 side is vertically lower than the nozzle insertion passage 100N side. Therefore, the opening / closing device 20 applies the liquid such as rainwater that has entered the nozzle insertion passage 100N from the recessed recess 11a and the communication port 21c toward the first opening 41 by the inclined wall portion 22c inclined as described above. Using its own weight to cause the liquid to reach the drain port 46a. As shown in FIG. 3, the filler neck 100 having the opening / closing device 20 according to the present embodiment is configured such that the inclination angle θ2 with respect to the horizontal direction of the inclined wall portion 22 c inclined so that the first opening 41 side is vertically downward, as shown in FIG. The angle was 2 to 5 degrees from the direction toward the lower side. Thereby, it is possible to secure the flow of the liquid from the nozzle insertion passage 100N to the first opening 41 via the inclined wall portion 22c. Therefore, the efficiency of draining the liquid that has entered the nozzle insertion passage 100N is increased. In addition, even if the inclined angle θ2 is 0 °, the inclined wall portion 22c allows the liquid to flow from the nozzle insertion passage 100N to the first opening 41 and drains the liquid due to vehicle vibration or the like. The angle θ2 is preferably 2 ° to 5 ° from the horizontal direction toward the lower side.

  When the drain valve 47 is pushed by the liquid that has reached the drain port 46a, the filler neck 100 having the opening / closing device 20 of the present embodiment opens the drain port 46a by the drain valve 47. Then, the liquid that has opened the drain valve 47 passes through the drain passage 48 d in the recess area of the recess wall 46 c, reaches the third opening 43 of the holding member 48, and then reaches the third opening 43. To the second opening 42 of the outer body 21 which is continuous with Since the second opening 42 is formed in the peripheral wall 21 a surrounding the inner body 22 and is open to the atmosphere, the liquid flowing to the second opening 42 is drained from the second opening 42 to the outside of the opening / closing device 20. You.

  The drainage mechanism 40 involved in liquid drainage from the first opening 41 of the inner body 22 to the second opening 42 of the outer body 21 is provided between the outer body 21 and the inner body 22 incorporated therein, that is, the inner body 22. Is merely provided in the built-in area. Therefore, in the outer body 21 of the opening / closing device 20, the second opening 42 that is open to the atmosphere only needs to be formed in the peripheral wall 21a, and it is necessary to provide a portion for forming a drain passage for discharging liquid to the outside of the device. There is no. In addition, in the opening and closing device 20 of the present embodiment, the drain valve 47 that opens and closes the drain port 46a is provided with a concave wall 46c that is recessed by projecting from the first opening 41 side toward the central axis OL of the nozzle insertion passage 100N. Is held by the holding piece 48c in the drainage passage 48d in the recessed area. As the holding area of the drain valve 47 expands from the first opening 41 side to the outer body 21 side, the installation area of the drain mechanism 40 expands to the outer body 21 side. In the opening and closing device 20 of the present embodiment, the drainage valve 47 is held in the drainage passage 48d in the recessed area of the recessed wall 46c that protrudes toward the center axis OL of the nozzle insertion passage 100N and is thus drained. The extension of the installation area of the mechanism 40 can be suppressed. As a result, according to the filler neck 100 having the opening and closing device 20 of the present embodiment, the liquid that has entered the nozzle insertion passage 100N can be reliably drained, and the outer body 21 of the opening and closing device 20 is moved outside the device. Projection can be prevented, or the degree of protrusion can be suppressed more reliably.

  The filler neck 100 having the opening / closing device 20 of the present embodiment holds the rotating shaft 47a of the drain valve 47 at the curved surface portions 48e of the pair of holding pieces 48c curved to face the shaft surface of the rotating shaft 47a. I do. Therefore, according to the filler neck 100 having the opening / closing device 20 of the present embodiment, the drain valve 47 can be smoothly rotated around the rotation shaft 47a. Moreover, even if the rotating shaft 47a slides along the curved surface of each curved surface portion 48e of the pair of holding pieces 48c and inclines, the groove 46da causes the rotating shaft 47a to be recessed in the drainage forming member 46. It does not contact the inner peripheral wall 46e of the place wall 46c. In other words, even if the rotating shaft 47a is tilted by sliding, the valve body 47c smoothly rotates around the rotating shaft 47a without any trouble. As a result, the drainage of the liquid that has entered the nozzle insertion passage 100N is further improved.

  The filler neck 100 having the opening / closing device 20 according to the present embodiment is configured such that the valve body 47c of the drain valve 47 is formed in the drain passage 48d of the concave wall 46c of the drain port forming member 46 by the pedestal portion 46d. It is received at the upper end surface of the opening of the mouth 46a. In addition, the filler neck 100 holds the drain valve 47 so that the rotation shaft 47a does not contact the inner wall surface of the recess wall 46c. Therefore, according to the filler neck 100 having the opening / closing device 20 of the present embodiment, the valve body 47c can be more smoothly rotated with the rotation shaft 47a as the base point, so that the drainage property can be further improved. .

  In the opening and closing device 20 of the present embodiment, the valve body 47c that rotates to open and close the drainage port 46a with the rotation shaft 47a located on the central axis OL side of the nozzle insertion passage 100N as a base point is rotated in a front view. An elliptical shape in which a side perpendicular to the moving axis 47a is a short side. The length of the valve body in a direction perpendicular to the rotation shaft 47a defines the extent of the area where the drainage mechanism 40 is installed from the central axis OL of the nozzle insertion passage 100N. In the opening / closing device 20 of the present embodiment, the length of the valve body in the direction perpendicular to the rotation shaft 47a is shorter than the length of the valve body in the direction parallel to the rotation shaft 47a. It is possible to suppress the expansion of the insertion region. Further, by forming the drain port 46a with an elliptical opening corresponding to the valve body 47c, it is possible to secure an opening area that can reliably drain the liquid that has entered the nozzle insertion passage 100N. As a result, according to the filler neck 100 having the opening / closing device 20 of the present embodiment, the liquid that has entered the nozzle insertion passage 100N can be reliably drained, and then the outer body 21 of the opening / closing device 20 is connected to the outside of the device. Can be prevented from protruding, or the degree of protrusion can be suppressed more reliably. In addition, according to the filler neck 100 having the opening and closing device 20 of the present embodiment, external contact with the drainage mechanism 40 can be avoided or suppressed.

  In the filler neck 100 having the opening / closing device 20 of the present embodiment, the rotating shaft 47a of the drain valve 47 is a rotating shaft having a flat portion 47b on the center axis OL side with respect to the center of the rotating shaft 47a. The extent of the area where the drainage mechanism 40 is installed from the central axis OL of the nozzle insertion passage 100N can be further suppressed by the amount of the notch of the rotating shaft 47a for forming the flat portion 47b. Therefore, according to the filler neck 100 having the opening and closing device 20 of the present embodiment, the protrusion of the outer body 21 of the opening and closing device 20 to the outside of the device can be further suppressed, and the contact of the drainage mechanism 40 from the outside can be suppressed. It can be avoided or suppressed more reliably.

  In the filler neck 100 having the opening / closing device 20 of the present embodiment, the length of the long side parallel to the rotation axis 47a is longer than the length of the short side perpendicular to the rotation axis 47a. The elliptical shape was 1.1 to 1.5 times. In addition, the inclined wall portion 22c that guides the liquid toward the first opening 41 in the inner body 22 has the first opening 41 side in the state where the filler neck 100 is inclined and attached to the vehicle as described above. It was inclined at a predetermined inclination angle θ2 (2 to 5 °) with respect to the horizontal direction so as to be vertically lower. Therefore, according to the filler neck 100 having the opening / closing device 20 of the present embodiment, it is possible to more reliably suppress the spread of the installation area of the drainage mechanism 40 and to incline the liquid that has entered the nozzle insertion passage 100N. The liquid can be reliably drained through 22c.

  The filler neck 100 having the opening / closing device 20 of the present embodiment holds the drainage mechanism 40 from the outside with respect to the inner body 22 by the outer body 21 to which the inner body 22 is assembled. Therefore, according to the filler neck 100 having the opening / closing device 20 of the present embodiment, the drainage mechanism 40 can be reliably held from the outside of the apparatus, and the external force is not directly applied to the drainage mechanism 40. it can.

  The filler neck 100 having the opening / closing device 20 according to the present embodiment is configured such that the posture of the holding member 48 when the engagement arm 48 a of the holding member 48 engages with the engagement protrusion 22 d of the inner body 22 is fitted to the drain port forming member 46. Is formed. Therefore, according to the filler neck 100 having the opening / closing device 20 of the present embodiment, the drainage mechanism 40 including the drainage port forming member 46 and the holding member 48 can be easily assembled to the first opening 41 of the inner body 22. Can be.

  The filler neck 100 having the opening / closing device 20 of the present embodiment includes an engagement protrusion 22d on the inner body 22 and an engagement arm with which the engagement protrusion 22d enters the engagement hole 48b and engages with the drain opening member 46. 48a. Therefore, according to the filler neck 100 having the opening / closing device 20 of the present embodiment, the drainage mechanism 40 including the drainage port forming member 46 and the holding member 48 is moved before the inner body 22 is attached to the outer body 21. In the state, it can be easily assembled by the first opening 41 of the inner body 22.

  In the filler neck 100 having the opening / closing device 20 of the present embodiment, a fuel passage 100P that guides the liquid fuel supplied from the refueling nozzle FN to the fuel tank FT is formed by the fuel passage forming portion 25. The fuel passage 100P is provided in the inner body 22 via the underbody 23 such that the fuel passage 100P is continuous with the nozzle insertion passage 100N of the inner body 22. In addition to this, the opening / closing device 20 of this embodiment has a tank-side opening / closing mechanism 30 that opens and closes the nozzle insertion passage 100N at a portion where the fuel passage 100P and the nozzle insertion passage 100N are continuous. The opening / closing mechanism 10 has a communication port 21c and a depression 11a that communicate the nozzle insertion passage 100N with the atmosphere on the peripheral wall of the nozzle insertion port 104. Therefore, according to the opening / closing device 20 of the present embodiment, the filler neck 100 that guides the fuel supplied from the refueling nozzle FN to the fuel tank FT can be provided with the opening / closing device 20 provided, and when the internal pressure of the fuel tank FT is abnormal. In, the tank-side opening / closing mechanism 30 releases the valve-closed state, and the air in the tank can be discharged to the atmosphere from the communication port 21c of the peripheral wall of the nozzle insertion port 104 and the recessed recess 11a of the insertion port opening / closing member 11.

  Note that the present invention can be realized in various modes. For example, the present invention can be realized in the form of a fuel tank having a fuel tank opening / closing device, a filler neck having a fuel tank opening / closing device, or a method of manufacturing a fuel tank opening / closing device.

Other embodiments:
In the above embodiment, the drain valve 47 is held by the curved surface portion 48e of the holding piece 48c facing the shaft surface of the rotating shaft 47a, but instead of the curved surface portion 48e, a V-shaped concave wall surface is used. The rotating shaft 47a may be held at a position.

  In the above-described embodiment, the pedestal portion 46d that receives the valve body 47c has a tapered shape. However, the shape is not limited to the tapered shape as long as the rotating shaft 47a does not contact the inner wall surface of the recess wall 46c. For example, a pedestal portion 46d having an annular convex portion protruding annularly at the opening of the drainage port 46a may be used.

  In the above embodiment, the valve body 47c of the drain valve 47 has an elliptical shape whose long side extends in a direction parallel to the rotation axis 47a. The shape is not limited to an elliptical shape as long as it is longer than the length of the valve body in a direction perpendicular to the moving shaft 47a. For example, the valve body 47c may be a rectangular valve body in which the length of the valve body in a direction parallel to the rotation axis 47a is longer than the length of the valve body in a direction perpendicular to the rotation axis 47a.

  In the above embodiment, the drain port 46a is an elliptical opening corresponding to the elliptical valve body 47c. However, the drain port 46a is not limited to the elliptical shape as long as the opening can be opened and closed by the valve body 47c. For example, the drain port 46a may be a rectangular opening corresponding to the rectangular valve body 47c, or a rectangular opening that can be opened and closed by the elliptical valve body 47c.

  In the above-described embodiment, the convex portion 46b is provided on the drain port forming member 46, and the convex portion 46b is inserted into the engaging hole 48b when the retaining member 48 is mounted on the inner body 22, and the posture of the retaining member 48 is set. However, the present invention is not limited to this. For example, by defining the interval between the engaging arms 48a of the holding member 48 in accordance with the widthwise dimension of the drain port forming member 46, the posture when the holding member 48 is mounted on the inner body 22 is determined. Is also good.

  In the above-described embodiment, the fuel supply device includes the fuel passage forming portion 25 that forms the fuel passage 100P that guides the liquid fuel supplied from the refueling nozzle FN to the fuel tank FT, and the tank-side opening / closing mechanism 30 that opens and closes the nozzle insertion passage 100N. Although it did, it is not limited to this. For example, the opening / closing device 20 having only the tank-side opening / closing mechanism 30 may be used. More specifically, instead of the filler neck 100 having the tank-side opening / closing mechanism 30 and the fuel passage forming section 25 in addition to the opening / closing device 20, the opening / closing device 20 may be used.

  The present invention is not limited to the above-described embodiments, examples, and modified examples, and can be realized with various configurations without departing from the spirit thereof. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the Summary of the Invention section are for solving some or all of the above-described problems, or In order to achieve some or all of the above-described effects, replacement and combination can be appropriately performed. Unless the technical features are described as essential in the present specification, they can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Insertion opening and closing mechanism 11 ... Insertion opening and closing member 11a ... Depressed recess 12 ... Insertion side spring 12L ... Fixed end 15 ... Annular body 20 ... Opening / closing device 21 ... Outer body 21a ... Peripheral wall 21b ... Ceiling wall 21c ... Communication opening 22 ... inner body 22a ... passage peripheral wall 22b ... protruding wall 22c ... inclined wall 22d ... engagement protrusion 23 ... underbody 25 ... fuel passage forming part 30 ... tank side opening and closing mechanism 31 ... tank side opening and closing member 32 ... tank side spring 32L ... Fixed end 40 ... Drainage mechanism 41 ... First opening 42 ... Second opening 43 ... Third opening 43a ... Protrusion 45 ... Circular seal body 46 ... Drain outlet forming member 46a ... Drain outlet 46b ... Convex 46c ... Concave wall 46d Base part 46da Groove part 46e Inner peripheral wall 47 Drain valve 47a Rotating shaft 47b Flat part 47c Valve body 48 Holding Member 48a Engagement arm 48b Engagement hole 48c Retaining piece 48d Drainage passage 48e Curved surface 100 Filler neck 100N Nozzle insertion passage 100P Fuel passage 102 Fuel vapor port 104 Nozzle insertion opening 104s Refueling port peripheral wall 104t: Nozzle insertion side peripheral wall BV: Gas release valve FE: Mounting member FN: Refueling nozzle FP: Filler pipe FR: Refueling chamber FS: Refueling device FT: Fuel tank NT: Fuel vapor tube OL: Center axis TV: Reverse Stop valve

Claims (3)

An opening and closing device (20) for a fuel tank,
A passage peripheral wall (22a) formed to surround the nozzle insertion passage (100N) of the refueling nozzle (FN), and a first opening formed in the passage peripheral wall (22a) to open the nozzle insertion passage (100N) to the atmosphere. A housing (22) having (41);
A cover body (21) into which the housing (22) is incorporated, a peripheral wall (21a) formed to surround the housing (22), and the first opening (41) formed in the peripheral wall (21a). ), Which has a second opening (42) that is open to the atmosphere and faces the upper wall (21b) of the peripheral wall (21a), and has a nozzle insertion port (104) of the refueling nozzle (FN) in the cover body (21). )When,
An insertion opening and closing mechanism (10) for opening and closing the nozzle insertion opening (104);
A drain mechanism (40) positioned between the cover body (21) and the housing (22) to drain liquid from the nozzle insertion passage (100N);
The drainage mechanism (40)
A recess which is attached to the first opening (41), protrudes from the first opening (41) side toward the center axis (OL) side of the nozzle insertion opening (104), and is recessed on the first opening (41) side. (48d) has a concave wall (46c) formed continuously with the second opening (42), and the concave wall (46c) is formed from the nozzle insertion passage (100N) to the first opening (41). A discharge port forming member (46) formed with a liquid discharge port (46a) for liquid flowing toward
A rotating shaft (47a) and a valve body (47c), and in the recess (48d), by rotating the valve body (47c) about the rotating shaft (47a) as a starting point, the drain port (47) is formed. A drain valve (47) for opening and closing 46a);
A fuel tank opening and closing device (20), comprising: a holding member (48) having a holding piece (48c) for holding the rotating shaft (47a) against the recess wall (46c). The fuel tank opening / closing device (20) according to claim 1, wherein:
The fuel tank opening / closing device (20), wherein the holding piece (48c) holds the rotating shaft (47a) at a curved surface portion (48e) facing the axial surface of the rotating shaft (47a). The fuel tank opening / closing device (20) according to claim 1 or 2, wherein:
The drain port forming member (46) connects the valve body (47c) to the drain port (46a) such that the rotating shaft (47a) does not contact the inner wall surface of the recess wall (46c). A fuel tank opening / closing device (20) having a pedestal (46d) received at an upper end surface of the opening.

Images