Fastener and hinge structure having the fastener

Abstract

To provide a fastener which achieves favorable workability during assembly.SOLUTION: A fastener 55 is coupled to both ends of a shaft 53 which is inserted into a base 9 and a rotating body 33 in a state where both ends of the shaft protrude. The fastener comprises: a base part 60 extending along an axial direction of the shaft; and a pair of engagement parts 61 provided at both ends of the base part and including mutually opposing first surfaces 63. Each of the pair of engagement parts has: a receiving hole 65 having a bottom section 69 recessed from the first surface and opposing the end of the shaft; a groove section 67 extending from the receiving hole to an edge section 71 of the engagement part and allowing passage of the end of the shaft; and a locking part 77 provided in the groove section and configured to lock the shaft.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a fastener and a hinge structure having the fastener.

Background Art

[0002] Patent Document 1 discloses a hinge structure for rotatably connecting a seat to a seat box of a two-wheeled vehicle as a storage box. The hinge structure has a first hinge member attached to the seat, a second hinge member attached to the seat box, and a hinge shaft connecting the first hinge member and the second hinge member. The hinge shaft has a shaft inserted into hinge holes provided in the first hinge member and the second hinge member, and a nut screwed onto an end of the shaft.

[0003] Patent Document 2 discloses a hinge structure used for a vehicle. The hinge structure has a first hinge member, a second hinge member, a shaft connecting the first hinge member and the second hinge member, and a fastener coupled to the shaft. The shaft is inserted into hinge holes provided in the first hinge member and the second hinge member with ends protruding. The fastener has a recess for receiving a bolt and is formed of a soft synthetic resin.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In order to assemble the hinge structure of Patent Document 1, it is necessary to screw a nut onto the end of the shaft. This operation is complicated and there is a problem that the workability during assembly is poor.

[0006] In order to assemble the hinge structure of Patent Document 2, it is necessary to receive the shaft in the recess while pulling and expanding the recess of the fastener. Since the fastener is formed of a soft synthetic resin, it is easily deteriorated. Further, this operation is complicated, and there is a problem that the workability at the time of assembly is poor.

[0007] In view of the above background, an object of the present invention is to provide a fastener with good workability at the time of assembly.

Means for Solving the Problems

[0008] In order to solve the above problems, an aspect of the present invention is a fastener (55) that couples to both ends of a shaft (53) inserted with both ends protruding to a base (9) and a rotating body (33), and has a base (60) extending along the axial direction of the shaft, and a pair of engaging portions (61) provided at both ends of the base and having a first surface (63) facing each other. Each of the pair of engaging portions has a receiving hole (65) recessed from the first surface and facing the end of the shaft, a groove portion (67) extending from the receiving hole to the edge portion (71) of the engaging portion and allowing the passage of the end of the shaft, and a locking portion (77) provided in the groove portion for locking the shaft.

[0009] According to this aspect, the shaft can be locked in the receiving hole by pushing the fastener against the shaft from a predetermined direction. Therefore, a fastener with good workability at the time of assembly can be provided.

[0010] In the above aspect, it is preferable that slits (73) are provided in the bottom portion and the bottom portion (72) of the groove portion, which penetrate in the axial direction, extend in the extending direction of the groove portion, and reach the edge portion of the engaging portion.

[0011] According to this aspect, when the fastener is pushed against the shaft, the engaging portion is deformed, and the shaft easily passes through the groove portion. Thereby, the fastener can be more easily coupled to the shaft with good workability.

[0012] In the above aspect, a hollowed-out portion (75) penetrating in the axial direction is provided between the receiving hole of the engaging portion and the base portion, and the slit may reach the hollowed-out portion across the receiving hole.

[0013] According to this aspect, when the fastener is pushed into the shaft, the engaging portion becomes more easily deformable. Thereby, the fastener can be more easily coupled to the shaft with better workability.

[0014] In the above aspect, the receiving hole may be formed in a circular shape when viewed from the axial direction.

[0015] According to this aspect, the shaft can be more easily rotated within the receiving hole. Therefore, the rotation of the rotating body with respect to the base becomes easier.

[0016] In the above aspect, the locking portion may be an elastic claw (79) protruding into the groove portion.

[0017] According to this aspect, when the fastener is coupled to the shaft or when the fastener is removed from the shaft, the elastic claw is elastically deformed. Thereby, the shaft can more easily pass through the groove portion.

[0018] In the above aspect, the elastic claw may have an inclined surface (78) protruding into the groove portion from the edge side of the engaging portion toward the receiving hole and a retaining surface (80) facing the receiving hole side.

[0019] According to this aspect, when the fastener is pushed into the shaft, the shaft is inserted into the groove portion along the inclined surface. Therefore, the fastener can be coupled to the shaft with good workability. Further, when the shaft is received in the receiving hole, the shaft is surely held in the receiving hole by the retaining surface. Therefore, it is possible to surely prevent the fastener from falling off the shaft.

[0020] Another aspect of the present invention to solve the above problems is a hinge structure (50) that rotatably connects a seat box (5) mounted on a saddle-type vehicle (1) and a seat (6) for opening and closing the seat box. The hinge structure has a shaft (53) inserted through the seat box and the seat with both ends protruding, and fasteners (55) coupled to both ends of the shaft. The fastener has a base portion (60) extending along the axial direction of the shaft, and a pair of engaging portions (61) provided at both ends of the base portion and having a first surface (63) facing each other. Each of the pair of engaging portions has a receiving hole (65) recessed from the first surface and facing the end of the shaft, a groove portion (67) extending from the receiving hole to the edge of the engaging portion and allowing the passage of the end of the shaft, and a locking portion (77) provided in the groove portion for locking the shaft.

[0021] According to this aspect, in the hinge structure that connects the seat box and the seat of the saddle-type vehicle, the workability during assembly can be improved.

Effect of the Invention

[0022] According to the above configuration, a fastener with good workability during assembly can be provided.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

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Figure 5

Figure 6

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Figure 8

Figure 9

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Figure 19

Embodiments for Carrying out the Invention

[0024] Hereinafter, with reference to the drawings, embodiments in which the fastener according to the present invention is applied to the hinge structure of the seat device of a straddle-type vehicle will be described. Hereinafter, for convenience of explanation, the front-rear, left-right, and up-down directions are defined based on the traveling direction of the straddle-type vehicle.

[0025] As shown in FIG. 1, a straddle-type vehicle (vehicle 1) has a vehicle body frame 2 and a seat device 4 supported by the vehicle body frame 2.

[0026] The seat device 4 has a seat box 5 as a storage box and a seat 6 for an occupant to sit on.

[0027] As shown in Fig. 2, the seat box 5 has a seat box body 7. The seat box body 7 forms a box shape that is open upward. The seat box body 7 extends in the front-rear direction such that its length in the front-rear direction is longer than its length in the left-right direction. At the central portion in the vehicle width direction at the front part of the seat box body 7, a seat box attachment portion 9 to which the seat 6 is connected is provided.

[0028] As shown in Figs. 2 to 5, the seat box attachment portion 9 extends forward from the seat box body 7. The seat box attachment portion 9 is preferably formed of a metal member. A first hinge hole 21 penetrating left and right is formed in the seat box attachment portion 9.

[0029] The seat 6 has a seat body 31 and a bracket 33.

[0030] The seat body 31 is plate-shaped and is formed so as to be able to close the opening of the seat box body 7. A bracket 33 is coupled to the front end of the lower surface of the seat body 31.

[0031] The bracket 33 has a pair of first members 35, a second member 36, and a third member 37 connecting the pair of first members 35 and the second member 36. The bracket 33 is formed of a metal plate-shaped member.

[0032] The pair of first members 35 are formed in a plate shape and each has a surface facing the left-right direction. A second hinge hole 44 penetrating the bracket 33 left and right is formed in each of the pair of first members 35.

[0033] The second member 36 is formed in a rectangular plate shape and connects the pair of first members 35 to each other left and right. The second member 36 is attached to the front end portion of the lower surface of the seat body 31. It is preferable that bolt holes 40 are provided in the second member 36. The second member 36 is preferably fastened to the seat body 31 by bolts 46 inserted into the bolt holes 40.

[0034] The third member 37 is formed in a rectangular plate shape. The third member 37 connects a pair of first members 35 to the left and right. The third member 37 and the pair of first members 35 may be connected at right angles to each other.

[0035] When providing the bracket 33 with respect to the seat box attachment portion 9, the operator arranges the bracket 33 such that the pair of first members 35 are each located outside in the left - right direction with respect to the seat box attachment portion 9. At this time, the operator arranges the bracket 33 such that the two second hinge holes 44 face the first hinge holes 21 respectively. Thereby, the first hinge holes 21 and the second hinge holes 44 cooperate to form a through - hole that penetrates the bracket 33 and the seat box attachment portion 9 in the left - right direction. A hinge structure 50 is provided on the bracket 33 and the seat box attachment portion 9.

[0036] As shown in FIGS. 3 to 6, the hinge structure 50 rotatably connects the bracket 33 as a rotating body to the seat box attachment portion 9 as a base. The hinge structure 50 has a shaft 53 and a fastener 55.

[0037] The shaft 53 is a metal member formed in a cylindrical shape. The shaft 53 is inserted into the first hinge holes 21 and the second hinge holes 44. Both ends of the shaft 53 protrude left and right from the pair of first members 35 of the bracket 33. That is, in the inserted state with respect to the bracket 33 and the seat box attachment portion 9, the axial direction of the shaft 53 coincides with the left - right direction.

[0038] The fastener 55 is a structure formed of resin. The fastener 55 has a base portion 60 extending in a predetermined direction and a pair of engaging portions 61 provided at both ends of the base portion 60. Hereinafter, the direction in which the base portion 60 extends is defined as the left - right direction to describe the fastener 55.

[0039] As shown in FIG. 7, a pair of engaging portions 61 extend from both ends of the base portion 60, respectively. Each of the pair of engaging portions 61 has a first surface 63 facing each other and a second surface 64 facing opposite to the first surface 63. A receiving hole 65 and a groove portion 67 are provided on the first surface 63, respectively. Each of the pair of engaging portions 61 has a bilaterally symmetric configuration. Therefore, hereinafter, one of the pair of engaging portions 61 will be described.

[0040] As shown in FIG. 8, the receiving hole 65 is a bottomed hole recessed from the first surface 63. In the present embodiment, the receiving hole 65 is formed in a circular shape when viewed from the left - right direction. The diameter of the receiving hole 65 is larger than the diameter of the shaft 53. The receiving hole 65 is preferably provided in a portion on the tip (i.e., the extending end) side of the engaging portion 61. The bottom 69 of the receiving hole 65 is connected to the first surface 63 on the left and right by side walls 70 as side portions of the receiving hole 65.

[0041] The groove portion 67 is a groove recessed from the first surface 63. The groove portion 67 extends from the receiving hole 65 to the edge portion 71 of the engaging portion 61. In the present embodiment, the groove portion 67 is provided in a portion on the tip side of the engaging portion 61 with respect to the receiving hole 65 and extends in the extending direction of the engaging portion 61. In another embodiment, the groove portion 67 may extend at a different angle with respect to the extending direction of the engaging portion 61.

[0042] Slits 73 are provided at the bottom 69 of the receiving hole 65 and the bottom portion 72 of the groove portion 67. The slit 73 is a hole penetrating the bottom 69 and the groove portion 67 in the left - right direction. The slit 73 extends in the extending direction of the groove portion 67 and reaches the edge portion 71 of the engaging portion 61. A cut - out portion 75 is provided between the receiving hole 65 and the base portion 60 in a portion on the base end side of the engaging portion 61.

[0043] The cut - out portion 75 is a hole penetrating the engaging portion 61 in the left - right direction. The cut - out portion 75 is preferably formed in a circular shape when viewed from the left - right direction. The slit 73 preferably reaches the cut - out portion 75 across the receiving hole 65 from the edge portion 71 of the engaging portion 61.

[0044] The groove portion 67 is provided with a locking portion 77. In the present embodiment, the locking portion 77 is provided at the edge of the groove portion 67. The locking portion 77 protrudes from the groove portion 67 toward the side wall 70 of the receiving hole 65. The locking portion 77 may be constituted by an elastic claw 79 that can be elastically deformed. The locking portion 77 may have an inclined surface 78 that inclines from the edge 71 side of the engaging portion 61 toward the receiving hole 65.

[0045] FIGS. 9 and 10 show the hinge structure 50 in a state where the fastener 55 is coupled to the shaft 53. The fastener 55 is coupled to both ends of the shaft 53. In the coupled state of the fastener 55 and the shaft 53, both ends of the shaft 53 are received in the receiving holes 65 of the fastener 55, respectively. Thereby, the bottom 69 of each receiving hole 65 faces the end of the shaft 53 and restricts the axial movement of the shaft 53. Further, both ends of the shaft 53 are locked in the receiving holes 65 by the locking portions 77, respectively. Thereby, the fastener 55 can be coupled to the shaft 53 without falling off from the shaft 53.

[0046] Next, with reference to FIGS. 5 and 6, a method of rotatably connecting the seat 6 to the seat box 5 via the hinge structure 50 according to the present embodiment will be described.

[0047] As a first step, the operator arranges the bracket 33 with respect to the seat box attachment portion 9. At this time, the operator arranges the seat box attachment portion 9 and the bracket 33 so that the first hinge hole 21 and the second hinge hole 44 face each other.

[0048] As a second step, the operator inserts the shaft 53 into the first hinge hole 21 and the second hinge hole 44. At this time, the operator inserts the shaft 53 so that both ends protrude from the seat box attachment portion 9 and the bracket 33.

[0049] As a third step, the operator arranges the fastener 55 in a predetermined orientation with respect to the shaft 53. At this time, the operator arranges the fastener 55 such that the extending direction of the base 60 coincides with the axial direction of the shaft 53 (in the left - right direction in this embodiment), and the tip portions of the pair of engaging portions 61 face the shaft 53 side (FIG. 6).

[0050] As a fourth step, the operator then couples the fastener 55 to the shaft 53. At this time, the operator may hold the base 60 and push the fastener 55 against the shaft 53 with the extending end portions of the engaging portions 61 abutted against both ends of the shaft 53.

[0051] At this time, the engaging portion 61 is elastically deformed by the force transmitted through both ends of the shaft 53, spreads in a direction orthogonal to the direction of pushing the fastener 55 and away from the shaft 53. As a result, both ends of the shaft 53 pass through the groove portion 67 while sliding on the inclined surface 78 of the locking portion 77 and are received in the receiving holes 65.

[0052] When both ends of the shaft 53 are received in the receiving holes 65 and the force applied by the operator to the fastener 55 is removed, the engaging portion 61 returns from the deformed state. Both ends of the shaft 53 are locked in the receiving holes 65 by the locking portion 77 (FIG. 5).

[0053] Thereby, the seat box mounting portion 9 and the bracket 33 can be rotatably connected via the hinge structure 50.

[0054] Next, the effect of the fastener 55 according to the present embodiment will be described. When the operator pushes the fastener 55 against the shaft 53 from a predetermined direction, both ends of the shaft 53 are received in the receiving holes 65. Since both ends of the shaft 53 are restricted from moving in the axial direction by the bottom portion 69 and locked by the locking portion 77, the shaft 53 is prevented from falling off the seat box mounting portion 9 and the bracket 33. Thereby, the fastener 55 can attach the shaft 53 to the seat box mounting portion 9 and the bracket 33. Therefore, a fastener 55 with good workability during assembly can be provided.

[0055] In addition, the bottom portion 69 and the bottom portion 72 of the groove portion 67 are provided with a slit 73 that penetrates axially and extends in the extending direction of the groove portion 67 to reach the edge portion 71 of the engaging portion 61. According to this configuration, when the fastener 55 is pushed into the shaft 53, the engaging portion 61 is elastically deformed by the slit 73. Therefore, the shaft 53 can easily pass through the groove portion 67. As a result, the fastener 55 can be more easily coupled to the shaft 53 with better workability.

[0056] In addition, a cutout portion 75 that penetrates axially is provided between the receiving hole 65 of the engaging portion 61 and the base portion 60, and the slit 73 crosses the receiving hole 65 and reaches the cutout portion 75. According to this configuration, when the fastener 55 is pushed into the shaft 53, the engaging portion 61 is more easily elastically deformed. As a result, the fastener 55 can be more easily coupled to the shaft 53 with better workability.

[0057] In addition, the receiving hole 65 is formed in a circular shape when viewed axially. As a result, the shaft 53 can easily rotate within the receiving hole 65. Therefore, the bracket 33 can easily rotate with respect to the seat box mounting portion 9.

[0058] In addition, the locking portion 77 is an elastic claw 79 that protrudes into the groove portion 67. According to this configuration, when the fastener 55 is coupled to the shaft 53 or when the fastener 55 is removed from the shaft 53, the elastic claw 79 is elastically deformed. As a result, the shaft 53 can easily pass through the groove portion 67.

[0059] In addition, the locking portion 77 has an inclined surface 78 that inclines from the edge portion 71 side of the engaging portion 61 toward the receiving hole 65. According to this configuration, when the fastener 55 is pushed into the shaft 53, the shaft 53 is inserted into the receiving hole 65 along the inclined surface 78. Therefore, the resistance when inserting the shaft 53 can be suppressed. As a result, the fastener 55 can be more easily coupled to the shaft 53 with better workability.

[0060] Furthermore, the hinge structure 50 having the fastener 55 according to the present embodiment rotatably connects the seat box 5 mounted on the vehicle 1 and the seat 6 for opening and closing the seat box 5. The hinge structure 50 includes a shaft 53 inserted through the seat box mounting portion 9 of the seat box 5 and the bracket 33 of the seat 6 with both ends protruding, and fasteners 55 coupled to both ends of the shaft 53.

[0061] According to this configuration, in the hinge structure 50 that connects the seat box 5 and the seat 6 of the vehicle 1, the workability during assembly can be improved.

[0062] Next, the hinge structure 50 according to the second embodiment will be described. The fastener 55 according to the second embodiment is different from the hinge structure 50 according to the first embodiment in the shape of the engaging portion 61. For other configurations, the same reference numerals as those in the first embodiment are given and the description is omitted.

[0063] As shown in FIGS. 11 and 12, the receiving hole 65 of the hinge structure 50 according to the second embodiment is formed in a rectangular shape when viewed from the axial direction of the shaft 53. The groove portion 67 is formed in a rectangular shape when viewed from the axial direction of the shaft 53 and is connected to the receiving hole 65.

[0064] The locking portion 77 is constituted by an elastic claw 79. The elastic claw 79 is provided on the bottom portion 72. In the present embodiment, the elastic claw 79 has an inclined surface 78 protruding into the groove portion 67 from the edge portion 71 side of the engaging portion 61 toward the receiving hole 65 and a reverse stop surface 80 facing the receiving hole 65 side. The engaging portion 61 does not have a slit 73 and a cutout portion 75 (see FIG. 8).

[0065] According to this configuration, when the fastener 55 is pushed into the shaft 53, the shaft 53 is inserted into the groove portion 67 along the inclined surface 78. Therefore, the fastener 55 can be coupled to the shaft 53 with good workability. Further, when the shaft 53 is received in the receiving hole 65, the shaft 53 is securely held in the receiving hole 65 by the anti-return surface 80. Therefore, it is possible to reliably prevent the fastener 55 from falling off the shaft 53. Furthermore, since the engaging portion 61 does not have the slits 73 and the relief portion 75 (see FIG. 8), the rigidity of the engaging portion 61 can be increased.

[0066] Next, the hinge structure 50 according to the third embodiment will be described. The hinge structure 50 according to the third embodiment is different from the hinge structure 50 according to the second embodiment in that two slits 73 are provided.

[0067] As shown in FIGS. 13 and 14, two slits 73 are formed in the bottom 69 of the receiving hole 65 and the bottom portion 72 of the groove portion 67 of the hinge structure 50 according to the third embodiment. Each of the two slits 73 reaches the edge 71 of the engaging portion 61 from the portion on the base 60 side of the engaging portion 61 in the receiving hole 65. By forming the two slits 73, the bottom 69 and the side wall 70 are divided in the extending direction of the groove portion 67.

[0068] According to this configuration, since the bottom 69 and the side wall 70 are divided, when the shaft 53 is received in the receiving hole 65, the bottom 69 is likely to be deformed. Therefore, the fastener 55 can be coupled to the shaft 53 with good workability.

[0069] Next, the hinge structure 50 according to the fourth embodiment will be described. The hinge structure 50 according to the fourth embodiment is different from the hinge structure 50 according to the third embodiment in that the shapes of the two slits 73 and the second slit 101 are provided.

[0070] As shown in FIGS. 15 and 16, the two slits 73 of the hinge structure 50 according to the fourth embodiment are formed in the bottom portion 72. The two slits 73 each extend from the bottom portion 72 toward the tip side of the engaging portion 61. The ends of the two slits 73 on the base portion 60 side are connected by a second slit 101. The second slit 101 extends in a direction orthogonal to the two slits 73 and penetrates the engaging portion 61 in the axial direction of the shaft 53. Thereby, the two slits 73 and the second slit 101 are formed in a U shape when viewed from the axial direction of the shaft 53. The portion (hereinafter referred to as the thin-walled portion 111) of the bottom portion 72 where the locking portion 77 is formed has a smaller thickness in the axial direction compared to the portion where the locking portion 77 is not formed.

[0071] According to this configuration, since the bottom portion 72 has the thin-walled portion 111, the engaging portion 61 is likely to bend when the shaft 53 enters the receiving hole 65. Therefore, the fastener 55 can be coupled to the shaft 53 with good workability.

[0072] Next, the hinge structure 50 according to the fifth embodiment will be described. The hinge structure 50 according to the fifth embodiment is different from the hinge structure 50 according to the second embodiment in the shape of the locking portion 77.

[0073] As shown in FIGS. 17 and 18, the locking portion 77 of the hinge structure 50 according to the fifth embodiment is provided in an M shape when viewed from the axial direction of the shaft 53. The locking portion 77 is a pair of elastic claws 79 that protrude from the edge of the groove portion 67 so as to face each other. Each of the pair of elastic claws 79 has an inclined surface 78 that protrudes into the groove portion 67 from the edge 71 side of the engaging portion 61 toward the receiving hole 65, and a check surface 80 facing the receiving hole 65 side.

[0074] According to this configuration, the shaft 53 can be locked in the receiving hole 65 from two directions by the locking portion 77. Therefore, the shaft 53 can be reliably prevented from falling off.

[0075] Next, the hinge structure 50 according to the sixth embodiment will be described. The hinge structure 50 according to the sixth embodiment differs from the hinge structure 50 according to the first embodiment in that it does not have a cutout portion 75 and in the extending direction of the groove portion 67.

[0076] As shown in FIG. 19, the groove portion 67 is provided in a portion on the tip side of the engaging portion 61 rather than the receiving hole 65, and extends in a direction orthogonal to the extending direction of the engaging portion 61.

[0077] According to this configuration, the direction in which the fastener 55 is pushed in order to couple the fastener 55 to the shaft 53 can be changed.

[0078] With the above, the description of the specific embodiments is completed. However, the present invention can be widely modified and implemented without being limited to the above embodiments. The hinge structure 50 may be used, for example, for a console box or the like mounted on the vehicle 1.

Description of Reference Numerals

[0079] 1: Vehicle (saddle-riding type vehicle) 5: Seat box 6: Seat 9: Seat mounting portion (base) 33: Bracket (rotating body) 53: Shaft 55: Fastener 60: Base 61: Engaging portion 63: First surface 65: Receiving hole 67: Groove portion 69: Bottom 71: Edge 72: Bottom portion 73: Slit 75: Cutout portion 77: Locking portion 78: Inclined surface 79: Elastic claw 80: Backstop surface

Claims

1. A fastener that couples to both ends of a shaft inserted with both ends protruding in a base and a rotating body, a base portion extending along the axial direction of the shaft, and a pair of engaging portions provided at both ends of the base portion and having first surfaces facing each other, each of the pair of engaging portions having a receiving hole recessed from the first surface and facing the end of the shaft, a groove portion extending from the receiving hole to the edge of the engaging portion and allowing the passage of the end of the shaft, and a locking portion provided in the groove portion for locking the shaft. A fastener having.

2. The fastener according to claim 1, wherein a slit is provided in the bottom portion of the bottom portion and the groove portion, which penetrates in the axial direction, extends in the extending direction of the groove portion, and reaches the edge portion of the engaging portion.

3. A cutout portion penetrating in the axial direction is provided between the receiving hole of the engaging portion and the base portion, The fastener according to claim 2, wherein the slit crosses the receiving hole and reaches the cutout portion.

4. The fastener according to claim 1, wherein the receiving hole is formed in a circular shape when viewed from the axial direction.

5. The fastener according to claim 1, wherein the locking portion is an elastic claw protruding into the groove portion.

6. The fastener according to claim 5, wherein the elastic claw has an inclined surface protruding into the groove portion from the edge side of the engaging portion toward the receiving hole and a check surface facing the receiving hole side.

7. A hinge structure that rotatably connects a seat box mounted on a saddle-type vehicle and a seat that opens and closes the seat box, a shaft inserted through the seat box and the seat with both ends protruding, and a fastener coupled to both ends of the shaft, the fastener having a base portion extending along the axial direction of the shaft and a pair of engaging portions provided at both ends of the base portion and having first surfaces facing each other, each of the pair of engaging portions having a receiving hole recessed from the first surface and facing the end of the shaft, a groove portion extending from the receiving hole to the edge of the engaging portion and allowing the passage of the end of the shaft, and a locking portion provided in the groove portion for locking the shaft. A hinge structure having.

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