JP2016188036A - Fuel cap for fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a spring to be easily housed in an inner cap to improve the assembly work efficiency in a fuel cap for a fuel tank including: an inner cap; an outer cap coupled to the inner cap; a fastening member which is held by the inner cap while protruding a pair of engagement parts from an outer periphery of the inner cap to a side; and a spring provided between the fastening member and an inner end part of the inner cap.SOLUTION: An inner cap 10A is formed by coupling a first inner cap half body 15A which is coupled to an outer cap 11 to a second inner cap half body 16 which sandwiches the first inner cap half body 15A with the outer cap 11. In a fuel cap for a fuel tank, a spring 13 is provided between a fastening member 12, which penetrates through the first inner cap half body 15A, and an end part of the second inner cap half body 16 which is opposite to the outer cap 11.SELECTED DRAWING: Figure 1

Description

  The present invention includes a pair of an inner cap that can be fitted into a fuel filler port of a fuel tank, an outer cap that has a gripping portion and is coupled to an outer end of the inner cap, and an opening edge of the fuel filler port. Tightening that is held by the inner cap so as to be movable in the direction along the axis of the oil filler port while projecting the engaging portions laterally from the outer periphery of the inner cap. A fuel tank comprising: a member; and a spring provided between the tightening member and an inner end of the inner cap so as to exert a resilient force that urges the tightening member toward the side close to the outer cap It relates to a fuel cap.

  A tightening member having a pair of engaging portions engageable with an opening edge of a fuel filler opening of the fuel tank is movably held by an inner cap that can be fitted into the fuel filler opening, and a spring that biases the tightening member A fuel cap adapted to be accommodated in the inner cap is already known from US Pat.

Japanese Patent No. 4810406

  However, in the one disclosed in Patent Document 1, the inner cap is formed of a single metal material so that the peripheral wall has a pair of through holes through which the tightening member passes. When accommodated in the inner cap, it is necessary to attach the fastening member to the inner cap so as to pass through the through hole of the inner cap in a state where the spring is compressed, and it is said that the assembly work efficiency is excellent. hard.

  The present invention has been made in view of such circumstances, and provides a fuel cap for a fuel tank in which a spring can be easily accommodated in an inner cap and assembly work efficiency can be improved. Objective.

  In order to achieve the above object, the present invention provides an inner cap that can be inserted into a fuel filler port of a fuel tank, an outer cap that has a gripping portion and is coupled to an outer end portion of the inner cap, It has a pair of engaging portions that can be engaged with the opening edge and allows the engaging portions to move in a direction along the axis of the fuel filler port while protruding sideways from the outer periphery of the inner cap. A clamping member held by the inner cap and a resilient force that urges the clamping member toward the side close to the outer cap so as to exert an elastic force between the clamping member and the inner end of the inner cap. A fuel cap for a fuel tank, comprising: a spring provided; a first inner cap half coupled to the outer cap; A second inner cap half sandwiching the inner cap half between the outer cap and the fastening member penetrating the first inner cap half; and the second inner cap half A first feature is that the spring is provided between an end opposite to the outer cap.

  According to the present invention, in addition to the configuration of the first feature, a through hole provided in the outer peripheral wall of the inner cap so as to penetrate the fastening member is formed in the first inner cap half. A second feature is that the recess is opened to the inner cap half body side and an end edge of the second inner cap half body on the first inner cap half body side.

  In the present invention, in addition to the configuration of the first or second feature, the outer cap, the first inner cap half, and the second inner cap half are formed of resin, A third feature is that they are bonded to each other by thermal welding.

  In addition to any of the configurations of the first to third features, the present invention can temporarily store the fuel that has flowed into the inner cap as the fuel tank changes in posture in the first inner cap half. And a valve for discharging fuel from the fuel reservoir into the fuel tank in a state where the fuel tank is returned to a normal posture is provided between the first and second inner cap halves. It is the fourth feature that it is provided.

  According to the present invention, in addition to the configuration of the fourth feature, the inner cap is formed in a bottomed cylindrical shape by closing a lower end portion, and has an outer cylindrical portion having a through hole in the peripheral wall that penetrates the fastening member. A bottomed cylindrical inner cylinder portion that is coaxially disposed in the outer cylinder portion so as to form the fuel storage portion therein and whose lower portion is closed by a bottom wall that defines a lower end of the fuel storage portion. A communication passage that is formed so as to cover the upper end portion of the inner cylinder portion and is coupled to the upper portion of the inner cap, and communicates the upper end portion of the fuel storage portion to the outside outside the fuel tank. And an annular chamber communicating with the fuel tank through the through hole is formed between the outer cylinder part and the inner cylinder part so as to accommodate the spring, and on the upper part of the inner cylinder part, The first communicating with the annular chamber To that communication holes are provided with fifth feature.

  Furthermore, the present invention is characterized in that, in addition to the configuration of the fifth feature, a second communication hole for allowing the annular chamber to communicate with the inside of the fuel tank is provided at a lower end portion of the outer cylinder portion. To do.

  According to the first feature of the present invention, the first inner cap half body through which the tightening member passes and the second inner cap half body in which the spring is interposed between the tightening member are coupled to each other. Therefore, when the spring is housed in the inner cap, the first inner cap half with the tightening member penetrated and the second inner cap half with the spring attached. The spring can be accommodated in the inner cap simply by connecting the two, and the assembly work efficiency can be enhanced by allowing the spring to be easily accommodated in the inner cap.

  According to the second feature of the present invention, the through hole provided in the outer peripheral wall of the inner cap so as to allow the fastening member to pass therethrough is formed by the recess on the first inner cap half side and the second inner cap half side. Since it is composed of the edge on the first inner cap half side, when the inner cap is assembled by joining the first and second inner cap halves, the tightening member is inserted into the recess of the first inner cap half What is necessary is just to assemble | attach to the 1st inner cap half body side of a fastening member, and can raise assembly work efficiency more.

  According to the third feature of the present invention, the outer cap, the first inner cap half and the second inner cap half formed of resin are coupled to each other by elastic engagement or heat welding. Compared to the one that combines the outer cap and the inner cap made of metal with each other to form the fuel cap, the production limit due to the molding of the outer cap and the inner cap with a mold, the necessity of surface treatment and Problems such as an increase in the number of processes do not occur, and the fuel cap can be configured while suppressing an increase in the number of parts.

  According to the fourth aspect of the present invention, the first inner cap half is formed with a fuel storage portion capable of temporarily storing the fuel that has flowed into the inner cap in accordance with a change in the posture of the fuel tank. When the tank returns to the normal posture, the fuel is discharged from the fuel storage portion into the fuel tank by the valve, so that it is possible to prevent the fuel from flowing out from the fuel cap depending on the temporary posture change of the fuel tank. Can do.

  According to the fifth feature of the present invention, the inner cap has a bottomed cylindrical outer tube portion having a through hole in the peripheral wall for penetrating the tightening member, and a fuel storage portion. And a bottomed cylindrical inner cylinder portion that is coaxially disposed at the bottom and closed at the bottom, and the upper end portion of the fuel storage portion is connected to the outside outside the fuel tank in the communication path formed in the outer cap. Since the first communication hole provided in the upper part of the inner cylinder part communicates with the annular chamber formed between the outer cylinder part and the inner cylinder part so as to accommodate the spring, the inside of the fuel tank has a through hole, It communicates with the outside through the annular chamber, the first communication hole, and the communication passage, so that the pressure in the fuel tank can be properly maintained.

  Further, according to the sixth aspect of the present invention, the annular chamber communicates with the fuel tank through the second communication hole provided at the lower end portion of the outer cylinder portion, so that the fuel accumulated in the annular chamber can be quickly brought into the fuel tank. Can be returned.

It is a principal part longitudinal cross-sectional view of the fuel tank of the state with which the fuel cap of 1st Embodiment was mounted | worn. It is sectional drawing of the fuel cap which follows the 2-2 line of FIG. It is a disassembled perspective view of a fuel cap. It is the perspective view seen from the slanting upper part of the 2nd inner cap half. It is a side view of the fuel cap of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  The first embodiment of the present invention will be described with reference to FIGS. 1 to 4. First, in FIG. 1, for example, a part of the fuel tank 5 is mounted on the upper part of the fuel tank 5 mounted on a motorcycle. An intruding metal fuel cylinder 7 is fixed, and a fuel inlet 8 formed in the upper part of the fuel cylinder 7 is closed by a fuel cap 9A so as to be opened and closed.

  The refueling cylinder 7 is coaxial within the upper portion of the cylindrical portion 7a so as to form a cylindrical portion 7a that penetrates the upper wall 5a of the fuel tank 5 and is welded to the upper wall 5a, and the refueling port 8. Are formed so as to integrally have a short cylindrical portion 7b disposed on the connecting portion and a connecting wall portion 7c for connecting the cylindrical portion 7a and the upper end portion of the short cylindrical portion 7b. A stopper 6 that abuts a fuel gun (not shown) inserted into the fuel filler port 8 and regulates the insertion end of the fuel gun is fixed to the lower portion of the cylindrical portion 7a of the fuel cylinder 7.

  The fuel cap 9A includes an inner cap 10A that can be fitted into the fuel filler port 8 of the fuel tank 5, an outer cap 11 that has a grip 11c and is coupled to an outer end of the inner cap 10A, A pair of engaging portions 12c that can be engaged with the lower edge of the short cylindrical portion 7b, which is the opening edge of the fuel filler opening 8, and the engaging portions 12c protrude sideways from the outer periphery of the inner cap 10A. The tightening member 12 that can be moved in the direction along the axis of the fuel filler port 8 and is held by the inner cap 10 </ b> A, and the elastic member that urges the tightening member 12 toward the side close to the outer cap 11. A coil-shaped spring 13 provided between the tightening member 12 and the inner end of the inner cap 10A is provided so as to exert a generating force.

  Referring also to FIG. 3, the outer cap 11 is made of resin, and includes a disk portion 11a, a first peripheral wall portion 11b extending downward from the outer periphery of the disk portion 11a, and the disk portion 11a. The grip portion 11c that extends along one diameter line and rises upward from the upper surface of the disk portion 11a, and a first portion that protrudes downward from the base portion of the first peripheral wall portion 11b while decreasing in diameter toward the lower side. 1 taper part 11d and the end plate part 11e which closes the lower end opening part of the 1st taper part 11d are formed so that it may have integrally.

  The inner cap 10A is coupled to a first inner cap half 15A coupled to the outer cap 11 and a second inner cap half 16 sandwiching the first inner cap half 15A between the outer cap 11 and the inner cap 10A. The fastening member 12 penetrating the first inner cap half 15A and the end of the second inner cap half 16 opposite to the outer cap 11 (the inner end of the inner cap 10A) The spring 13 is provided between the two.

  The first inner cap half 15A is made of resin, and has a bottomed cylindrical inner cylinder portion 15b extending vertically so that the lower portion is closed by the bottom wall portion 15a, and the inner cylinder portion 15b coaxially. A cylindrical upper and outer cylindrical portion 15c that surrounds, an upper wall portion 15d that connects between the inner cylindrical portion 15b and the upper end of the upper and outer cylindrical portion 15c, and a diameter that increases toward the upper side. A second tapered portion 15e protruding upward from the outer peripheral portion of the upper wall portion 15d, a second peripheral wall portion 15f extending downward from the outer periphery of the second tapered portion 15e, and the vertical direction of the second tapered portion 15e A pressing ring portion 15g protruding downward from the intermediate portion is integrally formed.

  By the way, a seal member 17 is sandwiched between the fuel cap 9A and the connecting wall portion 7c of the fuel cylinder 7 on the fuel tank 5 side, and the pressing ring portion 15g The seal member 17 abuts on the upper surface of the outer peripheral portion and functions to press the seal member 17 toward the connecting wall portion 7c.

  The outer cap 11 is coupled to the upper portion of the first inner cap half 15A by elastic engagement or thermal welding. In this embodiment, the first peripheral wall portion 11b of the outer cap 11 is used. The first taper portion 11d and the end plate portion 11e are in close contact with the upper wall portion 15d, the second taper portion 15e, and the second peripheral wall portion 15f of the first inner cap half body 15A. The outer cap 11 is joined to the upper part of the inner cap 10A by heat welding.

  Further, the upper outer cylinder portion 15c of the first inner cap half body 15A is formed shorter than the inner cylinder portion 15b, and is disposed above the lower end of the inner cylinder portion 15b so as to be formed at the bottom wall portion 15a. The lower part of the inner cylinder part 15b is closed.

  Referring also to FIG. 4, the second inner cap half 16 is made of resin, and has a diameter corresponding to the upper outer cylinder 15c of the first inner cap half 15A. 16a, an end wall portion 16b that closes the lower end of the lower outer cylinder portion 16a, and a disk-shaped raised portion that protrudes upward from the center of the end wall portion 16b so as to be fitted to the lower portion of the inner cylinder portion 15b. 16c and a plurality of support pins 16d that protrude upward from four locations, such as a plurality of locations spaced in the circumferential direction of the raised portion 16c, are integrally formed.

  The first and second inner cap halves 15A and 16 are joined by elastic engagement or thermal welding, and in this embodiment, the second inner cap halves to the first inner cap half 15A. The first and second inner cap halves 15A and 16 are coupled to each other by the 16 elastic engagement.

  In order to elastically engage the second inner cap half 16 with the first inner cap half 15A, the first inner cap half 15A is equidistantly spaced in the circumferential direction of the lower portion of the upper outer cylinder portion 15c. Locking holes 18 are provided at two locations, and a pair of engaging claws 19 that elastically engage with the locking holes 18 are provided on the lower outer cylindrical portion 16a of the second inner cap half 16 as described above. Each arm portion 20 is integrally formed at the distal end portion of a pair of arm portions 20 provided on the lower outer cylinder portion 16a so that a part thereof protrudes from the lower outer cylinder portion 16a toward the upper outer cylinder portion 15c. Are formed in the lower outer cylinder portion 16a. The slits 21 are arranged on both sides of the arm portion 20 so as to bend flexibly.

  The inner cap 10A configured by joining the first and second inner cap halves 15A and 16 is formed in a bottomed cylindrical shape with the lower end closed, and the inner cap 10A is a first inner cap. An outer cylinder portion 23A constituted by the upper outer cylinder portion 15c and the second inner cap half body 16 of the cap half body 15A, and a lower portion of the bottom wall portion 15a are arranged coaxially in the outer cylinder portion 23A. A bottomed cylindrical inner cylinder portion 15b to be closed, and the inner cylinder portion 15b of the first inner cap half body 15A has an inner cap 10A in the inner cap 10A as the posture of the fuel tank 5 changes. A fuel storage portion 24 that can temporarily store the inflowed fuel is formed so as to define the lower end at the bottom wall portion 15a.

  In order to discharge the fuel from the fuel reservoir 24 into the fuel tank 5 with the fuel tank 5 returned to the normal posture, a fuel is provided at the center of the raised portion 16c of the second inner cap half 16. A discharge hole 25 leading to the inside of the tank 5 is provided, and a valve hole 26 is provided in the bottom wall portion 15a of the first inner cap half 15A so as to define the lower end of the fuel storage portion 24. A circular sheet-like valve 27 capable of closing 26 is disposed between the bottom wall portion 15 a of the first inner cap half 15 </ b> A and the support pin 16 d of the second inner cap half 16.

  A distance L between the upper end of the support pin 16d and the lower end of the bottom wall portion 15a is set to be larger than the thickness d of the valve 27, and the fuel tank 5 changes its posture to discharge the fuel tank 5 from the fuel tank 5. When the pressure by the fuel that has flowed into the lower portion of the inner cylinder portion 15 b through the hole 25 acts on the valve 27 toward the bottom wall portion 15 a, the valve 27 closes the valve hole 26 to close the bottom hole 15. The valve closes closely to the wall 15a. On the other hand, when the fuel tank 5 is returned to the normal posture, the pressure from the fuel stored in the fuel storage unit 24 acts on the valve 27, so that the valve 27 is supported by the support pin 16d. The fuel in the fuel reservoir 24 passes through the gap 26 between the valve hole 26, the bottom wall 15a and the valve 27, and passes through the valve 27. The detour passes between the support pins 16d and is discharged into the fuel tank 5 from the discharge hole 25.

  The fastening member 12 includes a ring portion 12a that surrounds the inner cylinder portion 15b, and a pair of arm portions 12b that are disposed on one diameter line of the ring portion 12a and extend radially outward from the ring portion 12a. The engaging portions 12c each having a substantially U-shaped cross section opened downward are integrally formed at the distal end portion of each arm portion 12b.

  The pair of arm portions 12b that the fastening member 12 has integrally penetrates the first inner cap half 15A so that the engaging portion 12c protrudes laterally from the outer periphery of the inner cap 10A. And a through hole 30 provided in the outer peripheral wall of the inner cap 10A so as to penetrate the arm portion 12b is formed in the first inner cap half 15A and opened to the second inner cap half 16 side. 31 and the edge of the second inner cap half 16 on the first inner cap half 15A side.

  The outer cap 11 is formed with a communication passage 32 that communicates the upper end portion of the fuel storage portion 24 to the outside outside the fuel tank 5, and an annular chamber that communicates with the fuel tank 5 through the through hole 30. 33 is formed between the outer cylinder portion 23A and the inner cylinder portion 15b so as to accommodate the spring 13, and a first communication hole 34 communicating with the annular chamber 33 is formed above the inner cylinder portion 15b. Provided.

  A second communication hole 35 that allows the annular chamber 33 to communicate with the inside of the fuel tank 5 is provided in an end wall portion 16b of the second inner cap 10A that is a lower end portion of the outer cylinder portion 23A.

  The communication passage 32 in the outer cap 11 has a third communication hole 36 formed at the center of the end plate portion 11e so as to communicate with the upper end of the fuel storage portion 24, and a third communication hole. An inner space 37 formed in the outer cap 11 so as to communicate with 36, and a large diameter portion of the first taper portion 11d so as to communicate with the outer peripheral portion of the inner space 37 at a portion corresponding to the grip portion 11c. A fourth communication hole 38 provided on the side, and the second taper portion 15e of the inner cap 10A is provided with a fifth communication hole 39A arranged outward from the seal member 17 as a fourth. It is provided so as to communicate with the communication hole 38.

  Next, the operation of the first embodiment will be described. The inner cap 10A includes a first inner cap half 15A coupled to the outer cap 11, and the first inner cap half 15A is connected to the outer cap 11. The second inner cap half 16 sandwiched between them is joined, and the fastening member 12 penetrating the first inner cap half 15A and the outer cap 11 of the second inner cap half 16 opposite to the outer cap 11 are formed. Since the spring 13 is provided between the end portion, when the spring 13 is accommodated in the inner cap 10A, the first inner cap half 15A with the tightening member 12 penetrated and the spring 13 are mounted. The spring 13 can be accommodated in the inner cap 10 </ b> A simply by joining the second inner cap half 16 in a state where it has been removed. It can be, it is possible to enhance the assembling work efficiency by the spring 13 to be easily accommodated in the inner cap 10A.

  Further, a through hole 30 provided in the outer peripheral wall of the inner cap 10A so as to penetrate the fastening member 12 is formed in the first inner cap half 15A and a recess 31 that opens to the second inner cap half 16 side, and Since the second inner cap half 16 is composed of the edge on the first inner cap half 15A side, the first and second inner cap halves 15A, 16 are joined to assemble the inner cap 10A. The tightening member 12 may be inserted into the recess 31 of the first inner cap half 15A, and the assembly of the tightening member 12 to the first inner cap half 15A side is easy, and the assembly work efficiency is improved. Can be increased.

  Further, since the outer cap 11, the first inner cap half 15A and the second inner cap half 16 are formed of resin and are coupled to each other by elastic engagement or thermal welding, the metal outer cap and Compared to the fuel cap that is formed by connecting the inner caps to each other, the production limit due to the molding of the outer cap and the inner cap with a mold, the need for surface treatment and the increase in the number of processes, etc. Thus, the fuel cap 9A can be configured while suppressing an increase in the number of parts.

  The first inner cap half 15A is formed with a fuel storage portion 24 that can temporarily store the fuel that has flowed into the inner cap 10A in accordance with the change in posture of the fuel tank 5, so that the fuel tank 5 is in a normal posture. Since the valve 27 for discharging the fuel from the fuel storage part 24 into the fuel tank 5 in the state returned to the above is provided between the first and second inner cap halves 15A, 16, the fuel tank 5 temporarily Depending on the change in the general posture, it is possible to prevent the fuel from flowing out from the fuel cap 9A.

  Further, the inner cap 10A is formed in a bottomed cylindrical shape with its lower end closed, and has an outer cylinder portion 23A having a through-hole 30 through the fastening member 12 in the peripheral wall, and the fuel storage portion 24 inside. A bottomed cylindrical inner cylinder portion 15b that is coaxially disposed in the outer cylinder portion 23A and is closed at the bottom wall portion 15a that defines the lower end of the fuel storage portion 24 is formed. The upper end portion of the fuel storage portion 24 communicates with the outside outside the fuel tank 5 to the outer cap 11 that covers the upper end portion of the inner cylinder portion 15b and is coupled to the upper portion of the inner cap 10A. A communication passage 32 is formed, and an annular chamber 33 communicating with the fuel tank 5 through the through-hole 30 accommodates the spring 13 so as to accommodate the outer cylinder portion 23A and the front. Since the first communication hole 34 formed between the inner cylinder portions 15b and communicating with the annular chamber 33 is provided in the upper portion of the inner cylinder portion 15b, the inside of the fuel tank 5 has the through holes 30, the annular chamber 33, the first The communication hole 34 and the communication passage 32 communicate with the outside world, and the pressure in the fuel tank 5 can be maintained appropriately.

  Further, since the second communication hole 35 for allowing the annular chamber 33 to communicate with the fuel tank 5 is provided at the lower end portion of the outer cylinder portion 23A, the fuel accumulated in the annular chamber 33 can be quickly put into the fuel tank 5. Can be returned.

  A second embodiment of the present invention will be described with reference to FIG. 5. A fuel cap 9B includes an inner cap 10B and an outer cap that has a gripping portion 11c and is coupled to an outer end portion of the inner cap 10B. 11, a pair of engaging portions 12 c and a fastening member 12 held by the inner cap 10 B so as to project the engaging portions 12 c laterally from the outer periphery of the inner cap 10 B, and the tightening member 12. A coiled spring 13 (first) provided between the fastening member 12 and the inner end of the inner cap 10B so as to exert a resilient force that urges the attaching member 12 toward the side close to the outer cap 11. 1).

  The inner cap 10B is configured by coupling the first inner cap half 15B and the second inner cap half 16 and the outer cylinder portion 23B of the inner cap 10B penetrates the fastening member 12. The through-hole 40 is provided in the peripheral wall, and the through-hole 40 is located at a position shifted upward from the edge of the second inner cap half 16 on the first inner cap half 15B side. 15B.

  According to the second embodiment, when the first inner cap half 15B and the second inner cap half 16 are coupled to each other, the claw member 12 is held on the first inner cap half 15B side. The spring 13 can be attached to the inner cap simply by joining the first inner cap half 15B with the fastening member 12 penetrated and the second inner cap half 16 with the spring 13 attached. 10B and the spring 13 can be easily accommodated in the inner cap 10B, so that the assembly work efficiency can be improved.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

5 ... Fuel tank 8 ... Refueling port 9A, 9B ... Fuel cap 10A, 10B ... Inner cap 11 ... Outer cap 11c ... Grasping part 12 ... Tightening member 12c ... · Engaging portion 13 · · · springs 15A and 15B · · · first inner cap half 15a · · · bottom wall portion 15b · · · inner cylinder portion 16 · · · second inner cap half 23A, 23B · · · -Outer cylinder part 24 ... Fuel storage part 27 ... Valve 30, 40 ... Through-hole 31 ... Recess 32 ... Communication path 33 ... Annular chamber 34 ... First communication hole 35 ... 2nd communicating hole

Claims (6)

  An inner cap (10A, 10B) that can be inserted into the fuel filler opening (8) of the fuel tank (5) and a grip portion (11c) are coupled to the outer end of the inner cap (10A, 10B). The outer cap (11) has a pair of engaging portions (12c) that can be engaged with the opening edge of the oil filler port (8) and the engaging portions (12c) of the inner cap (10A, 10B). A tightening member (12) held on the inner cap (10A, 10B) to enable movement in the direction along the axis of the oil supply port (8) while projecting laterally from the outer periphery, and the tightening Between the inner ends of the tightening member (12) and the inner caps (10A, 10B) so as to exert a resilient force that urges the member (12) toward the side close to the outer cap (11). Setting A fuel cap for a fuel tank comprising a spring (13) to be mounted, wherein the inner cap (10A, 10B) is coupled to the outer cap (11) by a first inner cap half (15A, 15B); The inner cap half (15A, 15B) is joined with the second inner cap half (16) sandwiched between the outer cap (11) and penetrates through the first inner cap half (15A, 15b). The spring (13) is provided between the tightening member (12) and the end of the second inner cap half (16) opposite to the outer cap (11). A fuel cap for the fuel tank.   A through hole (30) provided in the outer peripheral wall of the inner cap (10A) so as to penetrate the fastening member (12) is formed in the first inner cap half (15A) to form a second inner cap half. The concave portion (31) that opens to the body (16) side and an end edge of the second inner cap half body (16) on the first inner cap half body (15A) side are provided. A fuel cap for a fuel tank as described in 1.   The outer cap (11), the first inner cap half (15A, 15B), and the second inner cap half (16) are formed of resin and coupled to each other by elastic engagement or heat welding. The fuel cap for a fuel tank according to claim 1 or 2, wherein the fuel cap is used.   A fuel reservoir (24) that can temporarily store the fuel that has flowed into the inner cap (10A, 10B) in accordance with the change in the posture of the fuel tank (5) in the first inner cap half (15A, 15B). ) And a valve (27) for discharging fuel from the fuel reservoir (24) into the fuel tank (5) in a state in which the fuel tank (5) has returned to a normal posture, The fuel cap for a fuel tank according to claim 1, wherein the fuel cap is provided between the cap half (15A, 15B) and the second inner cap half (16).   The inner cap (10A, 10B) is formed in a bottomed cylindrical shape with its lower end closed, and has an outer cylinder portion (23A) having a through hole (30, 40) through the fastening member (12) in the peripheral wall. 23B) and a bottom that defines the lower end of the fuel reservoir (24) and is coaxially disposed in the outer cylinder (23A, 23B) so as to form the fuel reservoir (24) inside. The inner cap (10A, 10B) is formed so as to have a bottomed cylindrical inner cylinder portion (15b) whose lower portion is closed by a wall portion (15a) and covers the upper end portion of the inner cylinder portion (15b). The outer cap (11) coupled to the upper portion of the fuel tank is formed with a communication path (32) for communicating the upper end of the fuel reservoir (24) with the outside outside the fuel tank (5), and the through hole Via (30, 40) An annular chamber (33) communicating with the inside of the fuel tank (5) is formed between the outer cylinder part (23A, 23B) and the inner cylinder part (15b) so as to accommodate the spring (13), The fuel cap for a fuel tank according to claim 4, wherein a first communication hole (34) communicating with the annular chamber (33) is provided in an upper portion of the inner cylinder portion (15b).   The second communication hole (35) for allowing the annular chamber (33) to communicate with the inside of the fuel tank (5) is provided at a lower end portion of the outer cylinder portion (23A, 23B). A fuel cap for a fuel tank as described in 1.

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