JP2017149342A - Capless oil supply port - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capless oil supply port capable of achieving a reduction in the number of components.SOLUTION: A capless oil supply port (11) includes: an oil supply port body (20) that is formed in a cylindrical shape and includes a nozzle insertion port (221) to which an oil supply nozzle (4) can be inserted and a fuel supply port (21a) that supplies a fuel to a filler tube (12); a flap valve (40) that is arranged inside of the oil supply port body (20) so as to block the nozzle insertion port (221) and is opened by insertion of the oil supply nozzle (4); a positive pressure relief valve (60) that is provided at a position different from the flap valve (40) and is opened when an internal pressure of the oil supply port body (20) is a predetermined value or more; and a coil spring (70) that is provided inside of the oil supply port body (20) and has one end (71) energized to a direction to which the flap valve (40) is closed and the other end (72) energized to a direction to which the positive pressure relief valve (60) is closed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a capless fuel filler.

  Patent Documents 1 and 2 disclose capless oil filler openings. The oil supply port disclosed in Patent Documents 1 and 2 includes a cylindrical passage forming member, a support member disposed on the side where the nozzle is inserted among the passage forming members, and a flap valve supported by the support member so as to be opened and closed. Prepare. Further, a positive pressure relief valve is provided at the fuel filler port for allowing the fuel filler port to escape when the internal pressure of the fuel filler port increases.

  The positive pressure relief valve described in Patent Document 1 is provided in the flap valve, and the positive pressure relief valve described in Patent Document 2 is provided separately from the flap valve.

JP 2014-213761 A JP 2014-8871 A

  A conventional positive pressure relief valve operates independently of the flap valve. Therefore, many parts are required for operating the flap valve and the positive pressure relief valve.

  It is an object of the present invention to provide a capless oil filler port that can reduce the number of parts.

  The capless oil filler according to the present invention is formed in a cylindrical shape, and includes a nozzle inlet that can be inserted with a fuel nozzle and a fuel inlet that supplies fuel to a filler tube, and an inside of the fuel filler main body. The flap valve, which is disposed so as to close the nozzle insertion port and is opened by inserting the fuel filler nozzle, is provided at a position different from the flap valve, and the internal pressure of the fuel filler main body is not less than a predetermined value. A positive pressure relief valve that opens in the case, and provided inside the fuel filler main body, one end is urged in a direction to close the flap valve, and the other end is in a direction to close the positive pressure relief valve A biasing coil spring.

  In a state where the fuel filler nozzle is not inserted into the fuel filler port, a spring member that biases the flap valve is required in order for the flap valve to close the nozzle insert port. In addition, a spring member that biases the positive pressure relief valve is required to close the positive pressure relief valve when the internal pressure of the fuel filler port is lower than a predetermined value. The coil spring functions as both a spring member that biases the flap valve and a spring member that biases the positive pressure relief valve. That is, the number of parts can be reduced by sharing the two functions with one coil spring.

It is a figure of a fuel line. It is an axial sectional view of a capless oil filler at the normal time. It is a perspective view of the different cross-sectional position of the capless oil filler opening of FIG. It is an axial sectional view of a capless oil supply port at the time of oil supply nozzle insertion. It is a perspective view of the different cross-sectional position of the capless oil filler opening of FIG. It is an axial sectional view of a capless oil filler at the time of operation of a positive pressure relief valve. It is a perspective view of the different cross-sectional position of the capless oil filler opening of FIG.

(1. Configuration of fuel line 1)
The configuration of the fuel line 1 will be described with reference to FIG. The fuel line 1 is a line from a fuel filler port 11 to an internal combustion engine (not shown) in an automobile. However, in the present embodiment, a description will be given from the fuel inlet 11 to the fuel tank 2 which is a part of the fuel line 1.

  The fuel line 1 includes at least a fuel tank 2, a resin filler 11, a filler tube 12, and a breather line 13. The fuel tank 2 stores liquid fuel such as gasoline. The liquid fuel stored in the fuel tank 2 is supplied to an internal combustion engine (not shown) and used to drive the internal combustion engine.

  The fuel filler port 11 is provided near the outer surface of the automobile into which the fuel nozzle 4 can be inserted. The oil filler 11 is a capless oil filler that does not include an oil filler cap. The oil filler 11 includes at least an oil filler main body 20 and a breather cylinder portion 30.

  The filler tube 12 connects the fuel supply port body 20 of the fuel supply port 11 and the fuel tank 2. When the fuel nozzle 4 is inserted into the fuel filler port 11 and liquid fuel is supplied from the fuel nozzle 4, the liquid fuel passes through the filler tube 12 and is stored in the fuel tank 2. Here, when the liquid fuel is full in the fuel tank 2, the liquid fuel is stored in the filler tube 12, and the liquid fuel is automatically supplied by the fuel nozzle 4 by touching the liquid fuel to the tip of the fuel nozzle 4. Stopped (auto stop function).

  The breather line 13 connects the fuel tank 2 and the breather cylinder portion 30 of the fuel filler port 11. The breather line 13 is a line for discharging the fuel vapor in the fuel tank 2 to the outside of the fuel tank 2 when the liquid fuel is supplied to the fuel tank 2 through the filler tube 12.

  The breather line 13 includes a cut valve device 13a, a connector 13b, and a breather tube 13c. The cut valve device 13a is arranged at the upper part of the fuel tank 2, and the fuel vapor in the fuel tank 2 is discharged to the fuel filler opening 11 side when it is open. The cut valve device 13a includes a metal connection pipe. The connector 13b is coupled to a connection pipe of the cut valve device 13a. The connector 13b is, for example, a connector described in Japanese Patent No. 3775656 or a configuration obtained by removing the flow control valve from the connector. That is, the connector 13b is detachably provided from the connection pipe of the cut valve device 13a. The breather tube 13c connects the connector 13b and the fuel filler port 11.

  Further, when the fuel tank 2 becomes full during fuel refueling and the auto-stop function is activated, liquid fuel returns from the fuel tank 2 to the fuel filler port 11 via the breather tube 13c. In this way, the breather tube 13c circulates the fuel vapor being refueled and the liquid recirculating fuel during auto-stop.

(2. Configuration of capless refueling port 11)
A detailed configuration of the fuel filler port 11 shown in FIG. 1 will be described with reference to FIGS. 2 and 3. The fuel filler 11 includes a fuel filler main body 20, a breather cylinder portion 30, a flap valve 40, a support shaft member 50, a positive pressure relief valve 60, and a coil spring 70.

  The fuel filler body 20 is made of resin and is formed in a cylindrical shape. The fuel filler body 20 includes a main cylinder portion 21, a nozzle insertion portion 22, and a pair of support portions 23. The main cylinder part 21 is formed to penetrate in the axial direction, and has openings at both ends. One end side (left side in FIGS. 2 and 3) of the main cylinder part 21 is located on the outer surface side of the automobile, and the other end side (right side in FIGS. 2 and 3) of the main cylinder part 21 is located on the fuel tank 2 side. To do. The main cylinder portion 21 includes a fuel supply port 21a that supplies fuel to the filler tube 12 on the other end side.

  Furthermore, the main cylinder portion 21 includes a reflux port 21b that opens upward near the center in the axial direction and a relief opening 21c that opens downward near the center in the axial direction. The reflux port 21b and the relief opening 21c are located on the same axis. More specifically, the reflux port 21 b and the relief opening 21 c are located at positions shifted from the central axis of the main cylinder portion 21.

  The main cylinder portion 21 is formed in a cylindrical shape having substantially the same diameter over the entire axial direction. On the outer peripheral surface of the main cylinder portion 21, a tube locking portion 21d is formed on the fuel supply port 21a side from the reflux port 21b. The tube locking portion 21d is formed in a bamboo shoot shape, that is, in a plurality of irregularities in the axial direction. The tube locking portion 21d is fitted with a filler tube 12 (shown in FIG. 1). Therefore, the tube locking portion 21 d suppresses the filler tube 12 from coming off from the main tube portion 21. An O-ring (not shown) is fitted in the recess of the tube locking portion 21d. That is, the O-ring seals between the tube locking portion 21 d and the filler tube 12.

  The nozzle insertion portion 22 is disposed inside the main tube portion 21 and on one end side (the left side in FIGS. 2 and 3) from the reflux port 21b. The nozzle insertion portion 22 includes a disk-shaped portion 22a having a circular hole at a position eccentric downward, and a cylinder extending in the axial direction from the circular hole of the disk-shaped portion 22a to the fuel supply port 21a side (the right side in FIGS. 2 and 3). -Like portion 22b. That is, the cylindrical part 22 b forms a nozzle insertion port 221 located on one end side of the main cylinder part 21. The nozzle insertion port 221 is smaller than the inner diameter of the main cylinder portion 21. The tip of the oil supply nozzle 4 can be inserted into the nozzle insertion port 221.

  The pair of support portions 23 is provided on the fuel supply port 21 a side (the right side in FIGS. 2 and 3) of the disk-shaped portion 22 a of the nozzle insertion portion 22. Specifically, the pair of support portions 23 is disposed above the cylindrical portion 22 b of the nozzle insertion portion 22. The support portion 23 is formed so as to extend from the disc-shaped portion 22a toward the fuel supply port 21a. A through hole (not shown) into which both ends of a support shaft member 50 described later is inserted is formed at the tip of the support portion 23. That is, the support part 23 supports both ends of the support shaft member 50.

  The breather cylinder portion 30 is formed in a cylindrical shape and is integrally formed outside the peripheral surface of the fuel filler main body 20. One end of the breather cylinder portion 30 is connected to the recirculation port 21b of the fuel filler main body 20, and the other end is connected to the breather tube 13c. The breather cylinder part 30 includes a main body coupling part 31 and a breather connection part 32. In the present embodiment, the main body connecting portion 31 and the breather connecting portion 32 are formed in an L shape.

  The main body connecting portion 31 is formed to extend radially outward and upward from the peripheral surface of the main cylinder portion 21 of the fuel filler main body 20. In particular, the main body connecting portion 31 is disposed so as to extend in a direction orthogonal to the axial direction of the main cylinder portion 21 of the fuel filler main body 20 when viewed from the side of the fuel filler main body 20. In the present embodiment, the main body connecting portion 31 is located at a position shifted from the central axis of the main cylinder portion 21. However, the main body connecting portion 31 may extend in a direction intersecting the central axis of the main cylinder portion 21, and may further extend in a direction inclined with respect to the axial direction of the main cylinder portion 21.

  The breather connecting portion 32 is bent from the end of the main body connecting portion 31. In the present embodiment, the breather connection portion 32 is bent so as to be substantially orthogonal to the main body coupling portion 31. A tube locking portion 32 a is formed on the outer peripheral surface of the breather connection portion 32. The tube locking portion 32a is formed in a bamboo shoot shape, that is, a plurality of irregularities in the axial direction. A breather tube 13c (shown in FIG. 1) is fitted into the tube locking portion 32a. Therefore, the tube locking portion 32a suppresses the breather tube 13c from coming out of the breather connection portion 32. An O-ring (not shown) is fitted in the recess of the tube locking portion 32a. That is, the O-ring seals between the tube locking portion 32a and the breather tube 13c.

  The flap valve 40 is disposed inside the fuel filler body 20 and closes the nozzle insertion port 221. The flap valve 40 includes a flap valve main body 41 and a seal member 42. The flap valve body 41 is formed in a hat hat shape. In a state where the flap valve 40 closes the nozzle insertion port 221, the collar portion of the flap valve main body 41 faces the end surface of the cylindrical portion 22 b of the nozzle insertion portion 22. On the other hand, in the said state, the center convex part of the flap valve main body 41 enters the cylindrical part 22b of the nozzle insertion part 22, and faces the outer surface side of a motor vehicle. That is, the central convex portion of the flap valve main body 41 is a portion that contacts the end of the fuel supply nozzle 4.

  The flap valve main body 41 includes a pair of arm portions 41a extending upward. A through hole is formed at the tip of the arm portion 41 a and is positioned coaxially with the through hole of the support portion 23 of the fuel filler main body 20.

  The seal member 42 is formed in an annular shape. As shown in FIGS. 2 and 3, the seal member 42 is disposed over the entire circumference on the nozzle insertion port 221 side (left side in FIGS. 2 and 3) of the flange portion of the flap valve main body 41. And the sealing member 42 will be in the state pinched | interposed between the end surface of the cylindrical site | part 22b of the nozzle insertion part 22, and the collar part of the flap valve main body 41. FIG. That is, the seal member 42 seals between the end surface of the cylindrical portion 22 b of the nozzle insertion portion 22 and the flange portion of the flap valve main body 41.

  The support shaft member 50 is held in a state of being inserted through the through hole of the support portion 23 of the fuel filler body 20 and the through holes of the pair of arm portions 41a. That is, the flap valve 40 is supported so as to be swingable about the support shaft member 50 with respect to the fuel filler body 20. Accordingly, the flap valve 40 swings around a position above the nozzle insertion port 221. Therefore, the flap valve 40 moves to a position close to the upper part of the inner peripheral surface of the main cylinder portion 21 in the valve open state.

  The positive pressure relief valve 60 is disposed in the relief opening 21c of the fuel filler main body 20 so as to be opened and closed. That is, the positive pressure relief valve 60 is provided at a position different from the flap valve 40. The positive pressure relief valve 60 functions as a portion for releasing the internal pressure when the internal pressure of the fuel filler main body 20 reaches a predetermined positive pressure value or more.

  The positive pressure relief valve 60 includes a relief valve main body 61, a lever 62, and a seal member 63. The relief valve body 61 is formed in a hat hat shape having a central convex portion and a collar portion. The relief valve main body 61 is movably disposed outside the relief opening 21 c of the main cylinder portion 21. That is, the relief valve main body 61 is located below the main cylinder portion 21. More specifically, the collar portion of the relief valve main body 61 faces the outer end face of the relief opening 21c. On the other hand, the central convex portion of the relief valve main body 61 enters the relief opening 21c.

  The lever 62 is integrally connected to the central convex portion of the relief valve main body 61 and is disposed so as to extend to the main tube portion 21 side. The front end 62a of the lever 62 is bent into a U shape. The tip 62a of the lever 62 is located near the reflux port 21b.

  The seal member 63 is formed in an annular shape. The seal member 63 is disposed over the entire circumference on the relief opening 21c side (upper side in FIG. 3) of the flange portion of the relief valve main body 61. And the sealing member 63 will be in the state pinched | interposed between the outer side end surface of the relief opening 21c, and the collar part of the relief valve main body 61. FIG. That is, the seal member 63 seals between the outer end surface of the relief opening 21 c and the collar portion of the relief valve main body 61.

  The coil spring 70 is provided inside the main cylinder portion 21 and is wound around the support shaft member 50 in a spiral shape in one direction. One end 71 of the coil spring 70 contacts the opposite side of the flap valve body 41 from the nozzle insertion port 221 (the right side in FIGS. 2 and 3). On the other hand, the other end of the coil spring 70 is hooked on the tip 62 a of the lever 62 of the positive pressure relief valve 60.

  And in the normal state shown in FIG.2 and FIG.3, the coil spring 70 will be in the state which provides urging | biasing force with respect to both ends. That is, in this state, one end of the coil spring 70 urges the flap valve body 41 toward the nozzle insertion port 221. In other words, one end of the coil spring 70 is biased in the direction in which the flap valve 40 is closed. Further, in this state, the other end of the coil spring 70 biases the lever 62 of the positive pressure relief valve 60 in a direction of pulling upward. In other words, the other end of the coil spring 70 is biased in the direction in which the positive pressure relief valve 60 is closed.

  Furthermore, the length from the coil center of the coil spring 70 to the one end 71 is different from the length from the coil center of the coil spring 70 to the other end 72. The length of the coil spring 70 from the coil center to the one end 71 is shorter than the length from the coil center of the coil spring 70 to the other end 72. Here, the coil center of the coil spring 70 is the position of the support shaft member 50.

(3. Refueling port 11 when refueling)
The oil supply port 11 at the time of refueling is demonstrated with reference to FIG.4 and FIG.5. At the time of non-fuel supply, the flap valve main body 41 closes the nozzle insertion port 221 via the seal member 42 as shown in FIGS. Specifically, the flap valve main body 41 is pressed against the cylindrical portion 22 b of the nozzle insertion portion 22 by the one end 71 of the coil spring 70.

  On the other hand, during refueling, the refueling nozzle 4 is inserted into the refueling port body 20 as shown in FIGS. At this time, the tip of the fuel supply nozzle 4 presses the flap valve main body 41. Then, the pressing force by the oil supply nozzle 4 resists the biasing force by the one end 71 of the coil spring 70, and the flap valve body 41 swings around the support shaft member 50. Then, the flap valve main body 41 and the seal member 42 are separated from the cylindrical portion 22b of the nozzle insertion portion 22, and the nozzle insertion port 221 is opened.

  At this time, the flap valve 40 moves upward about the support shaft member 50. That is, the coil spring 70 rotates counterclockwise in FIGS. Therefore, the other end 72 of the coil spring 70 tries to rotate counterclockwise. That is, the other end 72 of the coil spring 70 generates a force that pulls the lever 62. As a result, the relief valve main body 61 is pressed in a direction approaching the outer end face of the relief opening 21c.

  Accordingly, as the flap valve 40 opens, the coil spring 70 increases the urging force in the direction in which the positive pressure relief valve 60 is closed. When the flap valve 40 is opened, the positive pressure relief valve 60 is more difficult to open. Leakage from the positive pressure relief valve 60 can be reliably prevented when fuel is supplied by the fuel supply nozzle 4.

(4. Refueling port 11 during positive pressure relief operation)
The fuel filler port 11 during the operation of the positive pressure relief valve 60 will be described with reference to FIGS. 6 and 7. When the internal pressure of the fuel filler body 20 reaches a predetermined positive pressure value or more, the positive pressure relief valve 60 moves to the outside of the fuel filler body 20 against the urging force of the other end 72 of the coil spring 70. That is, the positive pressure relief valve 60 is opened.

(5. Influence of the length of the coil spring 70)
Next, the influence of the difference between the length of the coil spring 70 to the one end 71 and the length to the other end 72 will be described with reference to FIG.

  Since the length from the coil center of the coil spring 70 to the one end 71 is short, the urging force applied to the flap valve 40 by the one end 71 of the coil spring 70 becomes very large. Here, the flap valve 40 is opened by being pressed against the tip of the fuel supply nozzle 4. The force received by the flap valve 40 by the insertion of the fuel filler nozzle 4 is very large. Therefore, by increasing the biasing force applied to the flap valve 40 by the one end 71 of the coil spring 70, the coil spring 70 can be reliably opened and closed, and can be prevented from being easily opened except during refueling.

  On the other hand, since the length from the coil center of the coil spring 70 to the other end 72 is long, the urging force applied to the positive pressure relief valve 60 by the other end 72 of the coil spring 70 is small. Here, the area where the positive pressure relief valve 60 receives the internal pressure of the fuel filler main body 20 depends on the area of the relief opening 21c. That is, the force for opening the positive pressure relief valve 60 depends not only on the internal pressure of the fuel filler body 20 but also on the area of the relief opening 21c. Therefore, the biasing force applied to the positive pressure relief valve 60 by the other end 72 of the coil spring 70 can be reliably opened and closed. Therefore, the positive pressure relief valve 60 can relieve the internal pressure when the internal pressure of the fuel filler body 20 reaches a predetermined positive pressure value or more.

(6. Effects of the present embodiment)
The fuel filler port 11 of the present embodiment is formed in a cylindrical shape, and a fuel filler main body 20 including a nozzle supply port 21a into which the fuel filler nozzle 4 can be inserted and a fuel supply port 21a for supplying fuel to the filler tube 12, and a fuel filler main body. 20, the flap valve 40 which is disposed so as to close the nozzle insertion port 221 and is opened by the insertion of the fuel filler nozzle 4 is provided at a position different from the flap valve 40, and the internal pressure of the fuel filler main body 20 The positive pressure relief valve 60 is opened when the pressure is greater than or equal to a predetermined value, and is provided inside the fuel filler main body 20. One end 71 biases the flap valve 40 in the closing direction, and the other end 72 has a positive pressure relief. And a coil spring 70 that urges the valve 60 in a closing direction.

  In a state where the fuel filler nozzle 4 is not inserted into the fuel filler port 11, a spring member that biases the flap valve 40 is required in order for the flap valve 40 to close the nozzle insert port 221. In addition, a spring member that urges the positive pressure relief valve 60 is required to close the positive pressure relief valve 60 when the internal pressure of the fuel filler port 11 is lower than a predetermined value. The coil spring 70 functions as both a spring member that biases the flap valve 40 and a spring member that biases the positive pressure relief valve 60. That is, the number of components can be reduced by sharing the two functions with one coil spring 70.

  Further, the coil spring 70 increases the biasing force in the direction in which the positive pressure relief valve 60 is closed in accordance with the operation of opening the flap valve 40. As a result, when the flap valve 40 is opened, the positive pressure relief valve 60 becomes more difficult to open. Therefore, it is possible to reliably prevent leakage from the positive pressure relief valve 60 when fuel is supplied from the fuel supply nozzle 4.

  Further, the fuel filler port 11 includes a support shaft member 50 provided in the fuel filler main body 20. The coil spring 70 is wound around the support shaft member 50 in a spiral shape in one direction. Accordingly, the biasing force in the direction in which the coil spring 70 is closed with respect to the positive pressure relief valve 60 can be reliably increased with the operation of opening the flap valve 40.

  The flap valve 40 is supported by the support shaft member 50 so as to be swingable. That is, the support shaft member 50 has both functions of a support member for the flap valve 40 and a support member for the coil spring 70. That is, the support member can be shared, and the number of parts can be reduced.

  The support shaft member 50 is provided above the flap valve 40, and the positive pressure relief valve 60 is provided below the fuel filler body 20. Thereby, the shared coil spring 70 can be installed reliably.

  Further, the length from the coil center of the coil spring 70 to one end 71 of the coil spring 70 is different from the length from the coil center to the other end 72 of the coil spring 70. Thereby, the urging force by the one end 71 of the coil spring 70 and the urging force by the other end 72 can be set freely.

  In particular, the length from the coil center to one end 71 of the coil spring 70 is shorter than the length from the coil center to the other end 72 of the coil spring 70. Thereby, the urging | biasing force with respect to the flap valve 40 can be enlarged, and the urging | biasing force with respect to the positive pressure relief valve 60 can be made small.

  The fuel filler main body 20 includes a nozzle insertion port 221 at one end, a fuel supply port 21a at the other end, and a relief opening 21c for disposing a positive pressure relief valve 60 on the peripheral surface. The fuel filler port 11 includes a breather cylinder portion 30. The breather cylinder portion 30 includes a main body connecting portion 31 extending radially outward from the circumferential surface of the fuel filler main body 20, and a breather connecting portion 32 bent from the end of the main body connecting portion 31 and connected to the breather tube 13c. Prepare. The relief opening 21 c is formed coaxially with the main body connecting portion 31.

  By bending the breather cylinder portion 30, inhibition of the fuel flow in the fuel filler body 20 due to the reflux from the breather tube 13 c is suppressed. Furthermore, when the fuel supply from the fuel supply nozzle 4 is stopped, the spray back from the breather cylinder portion 30 toward the nozzle insertion port 221 is suppressed. Here, in general, it is not easy to bend the breather cylinder portion 30. However, since the relief opening 21c is formed coaxially with the main body connecting portion 31, the inner peripheral surface of the main body connecting portion 31 can be formed by inserting the mold from the relief opening 21c. Accordingly, it is easy to form the bent breather cylinder portion 30.

DESCRIPTION OF SYMBOLS 1: Fuel line, 2: Fuel tank, 4: Fuel supply nozzle, 11: Capless fuel supply port, 12: Filler tube, 13c: Breather tube, 20: Fuel supply port main body, 21: Main cylinder part, 21a: Fuel supply port, 21b: Return port, 21c: Relief opening, 22: Nozzle insertion portion, 221: Nozzle insertion port, 23: Support portion, 30: Breather cylinder portion, 31: Main body connecting portion, 32: Breather connection portion, 40: Flap valve, 41: flap valve body, 42: seal member, 50: support shaft member, 60: positive pressure relief valve, 61: relief valve body, 62: lever, 62a: tip, 63: seal member, 70: coil spring, 71: One end of the coil spring 72: The other end of the coil spring

Claims (8)

A fuel filler body that is formed in a cylindrical shape and includes a nozzle insertion port into which a fuel nozzle can be inserted and a fuel supply port that supplies fuel to the filler tube;
A flap valve that is arranged inside the fuel filler body and closes the nozzle insertion port, and is opened by insertion of the fuel nozzle;
A positive pressure relief valve that is provided at a position different from the flap valve, and that opens when the internal pressure of the fuel filler body is equal to or greater than a predetermined value;
A coil spring provided inside the fuel filler body, one end biasing in a direction to close the flap valve, and the other end biasing in a direction to close the positive pressure relief valve;
Capless oil filler.   2. The capless oil supply port according to claim 1, wherein the coil spring increases an urging force in a direction in which the positive pressure relief valve is closed in accordance with an operation of opening the flap valve. The capless oil filler comprises a support shaft member provided in the oil filler main body,
The capless oil filler opening according to claim 2, wherein the coil spring is wound around the support shaft member in a spiral shape in one direction.   The capless oil filler according to claim 3, wherein the flap valve is swingably supported by the support shaft member. The support shaft member is provided above the flap valve,
The capless oil supply port according to claim 4, wherein the positive pressure relief valve is provided below the oil supply port body.   The capless oil supply according to any one of claims 1 to 5, wherein a length from a coil center of the coil spring to the one end of the coil spring is different from a length from the coil center to the other end of the coil spring. mouth.   The capless oil filler according to claim 6, wherein a length from the coil center to the one end of the coil spring is shorter than a length from the coil center to the other end of the coil spring. The fuel filler main body includes the nozzle insertion port at one end, the fuel supply port at the other end, and a relief opening for disposing the positive pressure relief valve on the peripheral surface,
The capless refueling port includes a breather cylinder.
The breather cylinder portion includes a main body connecting portion extending radially outward from a peripheral surface of the fuel filler main body, and a breather connecting portion bent from an end of the main body connecting portion and connected to a breather tube,
The cap relief filler port according to any one of claims 1 to 7, wherein the relief opening is formed coaxially with the main body connecting portion.

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