TWI732057B - Bicycle chain - Google Patents

Abstract

[Question] To provide a bicycle chain that can appropriately prevent the deformation of the inner link piece.　　[Solution] A bicycle chain (7) is provided with a first chain roller (9), a second chain roller (11), and a first inner link piece (13). The first chain roller (9) and the second chain roller (11) are arranged to be spaced apart from each other. The first inner link piece (13) includes a first end (31) and a second end (32). The first end (31) has a first outer edge (31b). The first radial distance (D1) between at least a part of the first outer edge portion (41b) and the outer peripheral surface of the first chain roller (9) is greater than 0 mm and 0.2 mm or less.

Description

Bicycle chain

[0001] The present invention relates to a bicycle chain.

[0002] A conventional bicycle chain is a sprocket assembly that meshes with a sprocket and a rear wheel hung on a crank assembly. Bicycle chains are provided with: plural chain rollers, a pair of inner link pieces, and one outer link piece.

[Problem to be solved by the invention] 　　[0003] The object of the present invention is to provide a bicycle chain that can suppress the deformation of the inner link piece. [Means for Solving the Problem] 　　[0004] The bicycle chain of the first aspect of the present invention includes a first chain roller, a second chain roller, and a first inner link piece. The first chain roller and the second chain roller are arranged to be spaced apart from each other. The first inner link piece includes a first end and a second end. The first end has a first central axis and is used to support the first chain roller. The second end has a second central axis and is used to support the second chain roller.　　The first end has an outer edge. At least a part of the outer edge portion is arranged on either the outer side or the inner side of the first chain roller in the radial direction with respect to the first central axis. The radial distance between at least a part of the outer edge and the outer circumferential surface of the first chain roller is greater than 0 mm and 0.2 mm or less. [0005] In the bicycle chain, the radial distance between at least a part of the outer edge of the first end of the first inner link piece and the outer peripheral surface of the first chain roller is greater than 0 mm and less than 0.2 mm . With this structure, it is difficult for the sprocket teeth to contact the outer edge of the first inner link piece, and deformation of the first inner link piece can be suppressed.　　 Also, even if the sprocket teeth abut the outer edge of the first inner link piece, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced.　　[0006] The bicycle chain of the second aspect of the present invention includes a first chain roller, a second chain roller, and a first inner link piece. The first chain roller and the second chain roller are arranged to be spaced apart from each other. The first inner link piece includes a first end and a second end. The first end has a first central axis and is used to support the first chain roller. The second end has a second central axis and is used to support the second chain roller. "" In the axial direction with respect to the first central axis, the minimum axial length of the first end is 0.79 mm or less. The first end has an outer edge. The radial distance between at least a part of the outer edge portion and the outer circumferential surface of the first chain roller is 0 mm or more and 0.2 mm or less. [0007] In the bicycle chain, the radial distance between at least a part of the outer edge of the first end of the first inner link piece and the outer circumferential surface of the first chain roller is 0 mm or more and 0.2 mm the following. With this structure, it is difficult for the sprocket teeth to contact the outer edge of the first inner link piece, and deformation of the first inner link piece can be suppressed.　　In this bicycle chain, the minimum axial length of the first end is 0.79mm or less, so even if the sprocket assembly has a large number of sprockets, this bicycle chain can be applied.　　[0008] The bicycle chain of the third type of the present invention further includes a second inner link piece in the bicycle chain of the first or second type. The second inner link piece is arranged at a distance from the first inner link piece in the axial direction with respect to the first central axis in the state of being attached to the bicycle. The first chain roller and the second chain roller are arranged between the first inner link piece and the second inner link piece in the axial direction.　　[0009] This structure can also appropriately prevent the deformation of the first inner link piece. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced.　　[0010] In the bicycle chain of the fourth form of the present invention, in the bicycle chain of the third form, the first inner link piece includes an intermediate part connecting the first end and the second end. The middle part has a first chamfered part on the surface facing the second inner link piece in the state of being attached to the bicycle.　　[0011] In this case, since the intermediate portion has the first chamfered portion, the bicycle chain can be shifted smoothly. [0012] In the fifth type of bicycle chain of the present invention, in the third or fourth type of bicycle chain, the first inner link piece includes: an intermediate portion connecting the first end and the second end . The middle part has a first recessed part on the surface facing the second inner link piece in the state of being attached to the bicycle.　　[0013] In this case, since the intermediate portion has the first recessed portion, the axial distance between the first inner link piece and the second inner link piece can be enlarged. Thereby, the sprocket can be appropriately engaged between the axial directions of the first inner link piece and the second inner link piece.　　[0014] In the bicycle chain of the sixth form of the present invention, any of the third to fifth forms of bicycle chain further includes a first outer link piece and a second outer link piece. The first inner link piece is arranged between the axial direction of the first outer link piece and the second inner link piece in a state of being attached to the bicycle. The second inner link piece is arranged between the second outer link piece and the first inner link piece in the axial direction in a state of being attached to the bicycle.　　[0015] This structure can also appropriately prevent the deformation of the first inner link piece. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced. [0016] In the bicycle chain of the seventh aspect of the present invention, in the bicycle chain of the sixth aspect, the first outer link piece is in a state of being mounted on the bicycle and is opposite to the second outer link piece. The facing face has a second chamfer.　　[0017] In this case, since the first outer link piece has the above-mentioned second chamfered portion, the bicycle chain can be shifted smoothly. [0018] In the bicycle chain of the eighth form of the present invention, in the bicycle chain of the sixth or seventh form, the first outer link piece is connected to the second outer link in the state of being mounted on the bicycle The facing surface of the sheet has a second recess.　　[0019] In this case, since the first outer link piece has the second recessed portion, the axial distance between the first outer link piece and the second outer link piece can be enlarged. Thereby, the sprocket can be appropriately engaged between the axial directions of the first outer link piece and the second outer link piece.　　[0020] The ninth aspect of the bicycle chain of the present invention includes a first chain roller and a second chain roller, a first inner link piece, and a second inner link piece. The first chain roller and the second chain roller are arranged to be spaced apart from each other. The first inner link piece includes: a first end, a second end, and an intermediate portion.　　The first end has a first central axis and is used to support the first chain roller. The second end has a second central axis and is used to support the second chain roller. The middle part is used to connect the first end and the second end. The second inner link piece is arranged at a distance from the first inner link piece in the axial direction with respect to the first central axis in the state of being attached to the bicycle.　　[0021] The middle portion has a first recessed portion on the surface facing the second inner link piece in the state of being attached to the bicycle. The first end has an outer edge. The radial distance between at least a part of the outer edge portion and the outer circumferential surface of the first chain roller is 0 mm or more and 0.2 mm or less. [0022] In the bicycle chain, the radial distance between at least a part of the outer edge of the first end of the first inner link piece and the outer circumferential surface of the first chain roller is 0 mm or more and 0.2 mm the following. With this structure, it is difficult for the sprocket teeth to contact the outer edge of the first inner link piece, and deformation of the first inner link piece can be suppressed.　　 Also, even if the sprocket teeth abut the outer edge of the first inner link piece, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced.　　[0023] In addition, since the middle portion of the first inner link piece has the first recessed portion, the axial distance between the first inner link piece and the second inner link piece can be enlarged. Thereby, the sprocket can be appropriately engaged between the axial directions of the first inner link piece and the second inner link piece.　　[0024] In the bicycle chain of the tenth aspect of the present invention, in any of the bicycle chains of the first to ninth aspects, the first end has a ring portion. The ring portion is arranged to face the inner peripheral surface of the first chain roller, and is used to support the first chain roller. [0025] The radial distance, when the first chain roller is in contact with the annular portion in the longitudinal direction of the first inner link, is when the first chain roller and the ring are viewed in the axial direction with respect to the first central axis. The distance between at least a part of the outer edge at the time of the first inner link and the outer peripheral surface of the first chain roller.　　[0026] This structure can also appropriately prevent the deformation of the first inner link piece. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced. [0027] In the eleventh aspect of the bicycle chain of the present invention, in the tenth aspect of the bicycle chain, the longitudinal direction is defined as: from either the first central axis and the second central axis to the first The direction of either the 1 center axis or the second center axis.　　[0028] This structure can also appropriately prevent the deformation of the first inner link piece. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced.　　[0029] In the bicycle chain of the twelfth form of the present invention, in any one of the bicycle chains of the first to eleventh forms, the radial distance is 0.1 mm.　　[0030] This structure can also appropriately prevent the deformation of the first inner link piece. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced. [0031] In the 13th type of bicycle chain of the present invention, in any of the 1st to 12th types of bicycle chains, the area used to define the radial distance is determined by the first reference line and the second reference line. Defined by the reference line. The first reference line passes through the first central axis and the second central axis when the first chain roller and the first inner link are viewed in the axial direction with respect to the first central axis. The second reference line has an angle less than 180 degrees with respect to the first reference line and extends radially outward from the first central axis. The radial distance is defined within the area.　　[0032] This structure can also appropriately prevent the deformation of the first inner link piece. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced.　　[0033] In the bicycle chain of the 14th form of the present invention, in the bicycle chain of the 13th form, the second reference line is perpendicular to the first reference line.　　[0034] This structure can also appropriately prevent the deformation of the first inner link piece. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced.　　[0035] In the bicycle chain of the 15th type of the present invention, in the bicycle chain of the 13th or 14th type, the second reference line extends toward the rotation axis of the sprocket of the bicycle when it is installed on the bicycle.　　[0036] In this case, since the above-mentioned area becomes smaller, the deformation of the first inner link piece can be prevented more appropriately. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be further reduced.　　[0037] In the bicycle chain of the 16th aspect of the present invention, any bicycle chain of the 9th to 15th aspects is further provided with: a first outer link piece and a second outer link piece. The first inner link piece is arranged between the axial direction of the first outer link piece and the second inner link piece in a state of being attached to the bicycle. The second inner link piece is arranged between the second outer link piece and the first inner link piece in the axial direction in a state of being attached to the bicycle.　　[0038] This structure can also appropriately prevent the deformation of the first inner link piece. In addition, the sound generated by the contact between the sprocket teeth and the first inner link piece can be reduced. [0039] In the bicycle chain of the 17th aspect of the present invention, in the bicycle chain of the 16th aspect, the first outer link piece is opposite to the second outer link piece in the state of being mounted on the bicycle The facing face has a second chamfer.　　[0040] In this case, since the first outer link piece has the above-mentioned second chamfered portion, the bicycle chain can be shifted smoothly. [0041] In the bicycle chain of the 18th form of the present invention, in the bicycle chain of the 16th or 17th form, the first outer link piece is connected to the second outer link in the state of being mounted on the bicycle The facing surface of the sheet has a second recess.　　[0042] In this case, since the first outer link piece has the second recessed portion, the axial distance between the first outer link piece and the second outer link piece can be enlarged. Thereby, the sprocket can be appropriately engaged between the axial directions of the first outer link piece and the second outer link piece. [0043] In the bicycle chain of the 19th aspect of the present invention, in any of the bicycle chains of the first to 18th aspects, the maximum axial length relative to the first central axis in the axial direction is 5.62 mm or less .　　[0044] In this bicycle chain, the maximum axial length is 5.62mm or less, so even if the sprocket assembly has a large number of sprockets, this bicycle chain can be applied. [Effects of the Invention] 　　[0045] According to the present invention, in a bicycle chain, deformation of the inner link piece can be suppressed.

[0047] As shown in FIG. 1, the bicycle 1 according to the embodiment of the present invention has a front sprocket assembly 3, a rear sprocket assembly 5, and a chain 7 (an example of a bicycle chain). The chain 7 is wound around the front sprocket assembly 3 and the rear sprocket assembly 5. The driving force from the front sprocket assembly 3 is transmitted to the rear sprocket assembly 5 via the chain 7. The front sprocket assembly 3, the rear sprocket assembly 5, and the chain 7 constitute a driving part.　　[0048] <Chain> 　　As shown in Figures 2 and 3, the chain 7 includes a first chain roller 9 and a second chain roller 11, and a first inner link piece 13. The chain 7 further includes a second inner link piece 15. The chain 7 further includes a first outer link piece 17 and a second outer link piece 19. As shown in FIG. 3, the chain 7 further includes a first connecting pin 21 and a second connecting pin 23. [0049] Specifically, the chain 7 includes a plurality of first chain rollers 9 and a plurality of second chain rollers 11, a plurality of first inner link pieces 13, and a plurality of second inner link pieces 15, The plural first outer link pieces 17, the plural second outer link pieces 19, the plural first connecting pins 21, and the plural second connecting pins 23.　　[0050] (The first chain roller and the second chain roller) 　　 As shown in Figs. 2 and 3, the first chain roller 9 and the second chain roller 11 are arranged at an interval from each other. Specifically, the first chain rollers 9 are arranged at intervals in the longitudinal direction of the first inner link piece 13 and/or the longitudinal direction of the second inner link piece 15.　　[0051] The first chain roller 9 and the second chain roller 11 are arranged between the first inner link piece 13 and the second inner link piece 15 in the axial direction. The first chain roller 9 and the second chain roller 11 are rotatably supported by the first inner link piece 13 and the second inner link piece 15.　　[0052] Specifically, the first chain roller 9 is substantially formed in a ring shape. The first chain roller 9 has a first central axis C1. The first chain roller 9 is arranged between the first inner link piece 13 and the second inner link piece 15 in the axial direction with respect to the first central axis C1. The first chain roller 9 is arranged at the first end 31 (described later) of the first inner link piece 13 and the third inner link piece 15 in the axial direction relative to the first central axis C1. Between the ends 35 (described later).　　[0053] The first chain roller 9 is supported by the first inner link piece 13 and the second inner link piece 15. Specifically, the first chain roller 9 is supported by the first end 31 of the first inner link piece 13 and the third end 35 of the second inner link piece 15. In more detail, as shown in Fig. 3, the first chain roller 9 is formed by the first ring portion 31c (described later) of the first end portion 31 and the third ring portion 35c (described later) of the third end portion 35. (Described later) supported.　　[0054] The second chain roller 11 is formed substantially in a ring shape. The second chain roller 11 has a second central axis C2. The second chain roller 11 is arranged between the first inner link piece 13 and the second inner link piece 15 in the axial direction with respect to the second central axis C2. The second chain roller 11 is arranged at the second end 32 (described later) of the first inner link piece 13 and the fourth of the second inner link piece 15 in the axial direction relative to the second central axis C2. Between the ends 36 (described later).　　[0055] The second chain roller 11 is supported by the first inner link piece 13 and the second inner link piece 15. Specifically, the second chain roller 11 is supported by the second end 32 of the first inner link piece 13 and the fourth end 36 of the second inner link piece 15. As shown in Fig. 3, in more detail, the second chain roller 11 is formed by the second ring portion 32c (described later) of the second end portion 32 and the fourth ring portion 36c (described later) of the fourth end portion 36. (Described later) supported. [0056] (The first inner link piece and the second inner link piece) The first inner link piece is shown in FIGS. 2 and 3, and the first inner link piece 13 is arranged on the first outer link. Between the lever piece 17 and the second inner link piece 15 in the axial direction. Specifically, in a state where the chain 7 is attached to the bicycle 1, the first inner link piece 13 is arranged between the first outer link piece 17 and the second inner link piece 15 in the axial direction.　　[0057] As shown in FIG. 4, the first inner link piece 13 is, for example, a piece-shaped member that is long in one direction. The first inner link piece 13 includes a first end 31 and a second end 32. The first inner link piece 13 further includes: a first intermediate portion 33 (intermediate portion) connecting the first end portion 31 (an example of the first end portion) and the second end portion 32 (an example of the second end portion) An example of).　　[0058] -The first end part-　　 As shown in Figs. 2 to 4, the first end 31 is used to support the first chain roller 9. The first end 31 has a first central axis X1. The first center axis X1 is substantially coaxial with the first rotation center axis C1 of the first chain roller 9.　　[0059] As shown in Fig. 4, the first end portion 31 is substantially formed in a disc shape. The first end 31 is formed with a first hole 31a penetrating in the axial direction with respect to the first central axis X1.　　[0060] The first end portion 31 has a first outer edge portion 31b. The first end portion 31 further has a first annular portion 31c. The first outer edge portion 31b is formed substantially in an arc shape. Specifically, the first outer edge portion 31b is formed in an arc shape centered on the first central axis X1.　　[0061] At least a part of the first outer edge portion 31b is arranged on either the outer side or the inner side of the first chain roller 9 in the radial direction with respect to the first central axis X1. In this embodiment, at least a part of the first outer edge portion 31b is arranged on the outside of the first chain roller 9 in the radial direction with respect to the first central axis X1. Specifically, the entire first outer edge portion 31b is arranged outside the first chain roller 9 in the radial direction with respect to the first central axis X1.　　[0062] A first radial distance D1 is defined between the first outer edge portion 31b and the outer peripheral surface of the first chain roller 9. The first radial distance D1, when the first chain roller 9 is in contact with the first annular portion 31c in the longitudinal direction of the first inner link piece 13, is in the axial direction relative to the first central axis X1 The distance between at least a part of the first outer edge portion 31b and the outer peripheral surface of the first chain roller 9 when the first chain roller 9 and the first inner link are observed.　　[0063] Here, a slight gap is provided between the inner peripheral surface of the first chain roller 9 and the outer peripheral surface of the first annular portion 31c. The state in which the first chain roller 9 is in contact with the first ring-shaped portion 31c is, for example, a state in which the inner peripheral surface of the first chain roller 9 is in contact with the first ring-shaped portion 31c. The longitudinal direction is defined as a direction from one of the first center axis X1 and the second center axis X2 (described later) to the other of the first center axis X1 and the second center axis X2. In this embodiment, the longitudinal direction is defined as a direction from the first central axis X1 to the second central axis X2.　　[0064] In order to define the first radial distance D1, the first region R1 is set. In other words, the first radial distance D1 is defined in the first region R1. Specifically, the portion included in the first region R1 of the first outer edge portion 31b is a portion targeted for the first radial distance D1.　　[0065] The first area R1 is defined by the first reference line L1 and the second reference line L2. The first reference line L1 passes through the first center axis X1 and the second center axis X2 when the first chain roller 9 and the first inner link are viewed in the axial direction with respect to the first center axis X1.　　[0066] The second reference line L2 has an angle less than 180 degrees with respect to the first reference line L1 and extends radially outward from the first central axis X1. In this embodiment, the second reference line L2 is perpendicular to the first reference line L1. When the chain 7 is installed on the bicycle 1, the second reference line L2 preferably extends toward the rotation axis SC1 of the bicycle sprocket (for example, the rotation axis of the rear sprocket; refer to Figure 1). [0067] In more detail, in the state where the chain 7 is attached to the bicycle 1, the first outer edge portion 31b in the first region R1 is arranged on the side of the rotation axis SC1 of the sprocket of the bicycle. The line L2 preferably extends toward the rotation axis SC1 side of the sprocket of the bicycle.　　[0068] The first radial distance D1 between at least a part of the first outer edge portion 31b and the outer peripheral surface of the first chain roller 9 is greater than 0 mm and 0.2 mm or less. Specifically, the first radial distance D1 between the first outer edge portion 31b in the first region R1 and the outer peripheral surface of the first chain roller 9 is greater than 0 mm and 0.2 mm or less. In this embodiment, the first radial distance D1 is, for example, 0.1 mm. [0069] As described later, when the first intermediate portion 33 has the first recess 33c, at least a part of the first outer edge portion 31b (the first outer edge portion 31b in the first region R1) and the first chain roller 9 It is preferable that the first radial distance D1 between the outer circumferential surfaces of φ is 0 mm or more and 0.2 mm or less. [0070] In addition, in the case where the first minimum axial length d1 of the first end 31 in the axial direction with respect to the first central axis X1, for example, the thickness of the first end 31 is 0.79 mm or less, the first outer edge The first radial distance D1 between at least a part of the portion 31b (the first outer edge portion 31b in the first region R1) and the outer peripheral surface of the first chain roller 9 is preferably 0 mm or more and 0.2 mm or less.　　[0071] As shown in FIGS. 3 and 4, the first annular portion 31c is used to support the first chain roller 9. The first annular portion 31c is arranged to face the inner peripheral surface of the first chain roller 9.　　[0072] The first annular portion 31c is formed substantially in an annular shape. The first annular portion 31c and the first end portion 31 are formed integrally. Specifically, the first annular portion 31c is provided at the first end portion 31 and surrounds the first hole portion 31a in the circumferential direction with respect to the first central axis X1.　　[0073] The first annular portion 31c protrudes from the first end portion 31 in the axial direction with respect to the first central axis X1. Specifically, the first annular portion 31c protrudes from the first end portion 31 toward the second inner link piece 15 (for example, a third end portion 35 described later) in the axial direction with respect to the first central axis X1.　　[0074] -Second end part-　　 As shown in Figs. 2 to 4, the second end 32 is used to support the second chain roller 11. The second end 32 has a second central axis X2. The second center axis X2 is substantially coaxial with the second rotation center axis C2 of the second chain roller 11.　　 [0075] As shown in FIG. 4, the second end portion 32 is substantially formed in a disk shape. The second end 32 is formed with a second hole 32a penetrating in the axial direction with respect to the second central axis X2.　　[0076] The second end portion 32 has a second outer edge portion 32b. The second end portion 32 further has a second annular portion 32c. The second outer edge portion 32b is formed substantially in an arc shape. Specifically, the second outer edge portion 32b is formed in an arc shape centered on the second central axis X2.　　[0077] At least a part of the second outer edge portion 32b is arranged on either the outer side or the inner side of the second chain roller 11 in the radial direction with respect to the second central axis X2. In this embodiment, at least a part of the second outer edge portion 32b is arranged outside the second chain roller 11 in the radial direction with respect to the second central axis X2. Specifically, the entire second outer edge portion 32b is arranged outside the second chain roller 11 in the radial direction with respect to the first central axis X1.　　[0078] A second radial distance D2 is defined between the second outer edge portion 32b and the outer peripheral surface of the second chain roller 11. The second radial distance D2, when the second chain roller 11 is in contact with the second annular portion 32c in the longitudinal direction of the first inner link, is when the second chain roller 11 is viewed in the axial direction relative to the second central axis X2. 2 The distance between at least a part of the second outer edge portion 32b of the chain roller 11 and the first inner link and the outer peripheral surface of the second chain roller 11.　　[0079] Here, a slight gap is provided between the inner peripheral surface of the second chain roller 11 and the outer peripheral surface of the second annular portion 32c. The state in which the second chain roller 11 is in contact with the second ring-shaped portion 32c is, for example, a state in which the inner peripheral surface of the second chain roller 11 is in contact with the second ring-shaped portion 32c. The longitudinal direction is defined as a direction from one of the first center axis X1 and the second center axis X2 to the other of the first center axis X1 and the second center axis X2. In this embodiment, the longitudinal direction is defined as a direction from the first central axis X1 to the second central axis X2.　　[0080] In order to define the second radial distance D2, the second region R2 is set. In other words, the second radial distance D2 is defined in the second region R2. Specifically, the portion included in the second region R2 of the second outer edge portion 32b is a portion targeted for the second radial distance D2.　　[0081] The second area R2 is defined by the first reference line L1 and the third reference line L3. The third reference line L3 has an angle less than 180 degrees with respect to the first reference line L1 and extends radially outward from the second central axis X2. In this embodiment, the third reference line L3 is perpendicular to the first reference line L1. In the state where the chain 7 is installed on the bicycle 1, the third reference line L3 preferably extends toward the rotation axis SC2 of the bicycle sprocket (for example, the rotation axis of the front sprocket; refer to Figure 1). [0082] In more detail, in the state where the chain 7 is attached to the bicycle 1, the second outer edge portion 32b in the second region R2 is arranged on the side of the rotation axis SC1 of the sprocket of the bicycle. The line L3 preferably extends toward the rotation axis SC1 side of the sprocket of the bicycle.　　[0083] The second radial distance D2 between at least a part of the second outer edge portion 32b and the outer peripheral surface of the second chain roller 11 is greater than 0 mm and 0.2 mm or less. Specifically, the second radial distance D2 between the second outer edge portion 32b in the second region R2 and the outer peripheral surface of the second chain roller 11 is greater than 0 mm and 0.2 mm or less. In this embodiment, the second radial distance D2 is, for example, 0.1 mm. [0084] As will be described later, when the first intermediate portion 33 has the first recess 33c, at least a part of the second outer edge portion 32b (the second outer edge portion 32b in the second region R2) and the second chain roller 11 It is preferable that the second radial distance D2 between the outer circumferential surfaces of φ is 0 mm or more and 0.2 mm or less. [0085] Furthermore, when the second minimum axial length d2 of the second end 32 in the axial direction with respect to the second central axis X2, for example, the thickness of the second end 32 is 0.79 mm or less, the second outer edge The first radial distance D1 between at least a part of the portion 32b (the second outer edge portion 32b in the second region R2) and the outer peripheral surface of the second chain roller 11 is preferably 0 mm or more and 0.2 mm or less.　　[0086] As shown in FIGS. 3 and 4, the second ring portion 32c is used to support the second chain roller 11. The second annular portion 32c is arranged to face the inner peripheral surface of the second chain roller 11.　　[0087] The second annular portion 32c is formed substantially in an annular shape. The second annular portion 32c and the second end portion 32 are formed integrally. Specifically, the second annular portion 32c is provided at the second end portion 32 and surrounds the second hole portion 32a in the circumferential direction with respect to the second central axis X2.　　[0088] The second annular portion 32c protrudes from the second end portion 32 in the axial direction with respect to the second central axis X2. Specifically, the second annular portion 32c protrudes from the second end portion 32 toward the second inner link piece 15 (for example, a fourth end portion 36 described later) in the axial direction with respect to the second central axis X2.　　[0089] -The first intermediate portion-　　 As shown in FIGS. 3 and 4, the first intermediate portion 33 is formed integrally with the first end portion 31 and the second end portion 32. The outer edge portion 33a of the first intermediate portion 33 is curved in a concave shape toward a straight line (first reference line L1) connecting the first center axis X1 and the second center axis X2 (refer to FIG. 4).　　[0090] The first intermediate portion 33 has a first chamfered portion 33b on the surface facing the second inner link piece 15 in the state of being attached to the bicycle. The first chamfered portion 33b is formed by chamfering the corner portion of the outer edge portion 33a of the first intermediate portion 33. For example, the first chamfered portion 33b is formed by chamfering a corner formed by the bottom of the first recess 33c and the outer edge portion 33a of the first intermediate portion 33, which will be described later. [0091] In this embodiment, the first chamfered portion 33b is a second portion extending from the outer edge portion 33a of the first intermediate portion 33 to the first outer edge portion 31b of the first end portion 31 and the second end portion 32 Outer edge portion 32b (refer to Figure 1). That is, the first chamfered portion 33b is also included in the first outer edge portion 31b of the first end portion 31 and the second outer edge portion 32b of the second end portion 32.　　[0092] The first intermediate portion 33 has a first recess 33c on the surface facing the second inner link piece 15 in a state where the chain 7 is attached to the bicycle 1. For example, the first recess 33c is formed in a concave shape in a direction away from the second inner link piece 15. Here, the direction away from the second inner link piece 15 is along the axial direction with respect to the first central axis X1 and/or the axial direction with respect to the second central axis X2. [0093] The second inner link piece is shown in FIGS. 2 and 3, and the second inner link piece 15 is arranged so as to be aligned with the first inner link in the axial direction relative to the first central axis X1. The sheet 13 is separated by an interval. In detail, in a state where the chain 7 is attached to the bicycle 1, the second inner link piece 15 is arranged at an interval from the first inner link piece 13 in the axial direction with respect to the first central axis X1.　　[0094] The second inner link piece 15 is arranged between the second outer link piece 19 and the first inner link piece 13 in the axial direction. Specifically, in a state where the chain 7 is attached to the bicycle 1, the second inner link piece 15 is arranged between the second outer link piece 19 and the first inner link piece 13 in the axial direction.　　[0095] As shown in FIG. 5, the second inner link piece 15 is, for example, a piece-shaped member that is long in one direction. The second inner link piece 15 includes a third end 35 and a fourth end 36. The second inner link piece 15 further includes a second intermediate portion 37 connecting the third end portion 35 and the fourth end portion 36.　　[0096] The third end 35 and the first end 31 have substantially the same structure. The third end 35 is formed with a third hole 35a penetrating in the axial direction with respect to the first central axis X1. The third end 35 has a third outer edge 35b. The third outer edge portion 35b has substantially the same structure as the first outer edge portion 31b. The third end 35 further has a third annular portion 35c. The third annular portion 35c is arranged at an interval from the first annular portion 31c in the axial direction with respect to the first central axis X1 (refer to FIG. 3). [0097] The third radial distance D3 between at least a part of the third outer edge portion 35b (the third outer edge portion 35b in the third region R3) and the outer peripheral surface of the first chain roller 9 is greater than 0 mm and is Below 0.2mm. For example, the third radial distance D3 is 0.1 mm. The third radial distance D3 is defined in the same manner as the first radial distance D1 based on the third annular portion 35c. The third region R3 is defined in the same manner as the first region R1. [0098] As will be described later, when the second intermediate portion 37 has the second recess 37c, at least a part of the third outer edge portion 35b (the third outer edge portion 35b in the third region R3) and the third chain roller 9 It is preferable that the third radial distance D3 between the outer peripheral surfaces of φ is 0 mm or more and 0.2 mm or less. [0099] Furthermore, in the case where the third minimum axial length d3 of the third end 35 in the axial direction with respect to the first central axis X1, for example, the thickness of the third end 35 is 0.79 mm or less, the third outer edge The third radial distance D3 between at least a part of the portion 35b (the third outer edge portion 35b in the third region R3) and the outer peripheral surface of the first chain roller 9 is preferably 0 mm or more and 0.2 mm or less.　　[0100] The fourth end 36 and the second end 32 have substantially the same structure. The fourth end 36 is formed with a fourth hole 36a penetrating in the axial direction with respect to the second central axis X2. The fourth end portion 36 has a fourth outer edge portion 36b. The fourth outer edge portion 36b has substantially the same structure as the first outer edge portion 31b. The fourth end 36 further has a fourth annular portion 36c. The fourth annular portion 36c is arranged at an interval from the second annular portion 32c in the axial direction with respect to the second central axis X2 (refer to FIG. 3). [0101] The fourth radial distance D4 between at least a part of the fourth outer edge portion 36b (the fourth outer edge portion 36b in the fourth region R4) and the outer circumferential surface of the second chain roller 11 is greater than 0 mm and is Below 0.2mm. For example, the fourth radial distance D4 is 0.1 mm. The fourth radial distance D4 is defined in the same manner as the second radial distance D2 based on the fourth annular portion 36c. The fourth region R4 is defined in the same manner as the second region R2. [0102] As will be described later, when the second intermediate portion 37 has the second recess 37c, at least a part of the fourth outer edge portion 36b (the fourth outer edge portion 36b in the fourth region R4) and the second chain roller 11 Preferably, the fourth radial distance D4 between the outer circumferential surfaces of φ is 0 mm or more and 0.2 mm or less. [0103] Furthermore, in the case where the fourth minimum axial length d4 of the fourth end 36 in the axial direction relative to the second central axis X2, for example, the minimum thickness of the fourth end 36 is 0.79 mm or less, the fourth outer The fourth radial distance D4 between at least a part of the edge portion 36b (the fourth outer edge portion 36b in the fourth region R4) and the outer circumferential surface of the second chain roller 11 is preferably 0 mm or more and 0.2 mm or less .　　[0104] The second intermediate portion 37 is formed integrally with the third end portion 35 and the fourth end portion 36. The outer edge portion 37a of the second intermediate portion 37 is curved in a concave shape toward a straight line (first reference line L1) connecting the first center axis X1 and the second center axis X2.　　[0105] The second intermediate portion 37 has a second chamfered portion 37b on the surface facing the first inner link piece 13 in a state where the chain 7 is attached to the bicycle 1. The second chamfered portion 37b is formed by chamfering the corner portion of the outer edge portion 37a of the second intermediate portion 37. For example, the second chamfered portion 37b is formed by chamfering a corner formed by the bottom of the second recessed portion 37c and the outer edge portion of the second intermediate portion 37, which will be described later. [0106] In this embodiment, the second chamfered portion 37b extends from the outer edge portion of the second intermediate portion 37 to the third outer edge portion 35b of the third end portion 35 and the fourth outer edge portion of the fourth end portion 36. Edge 36b (refer to Figure 1). That is, the second chamfered portion 37 b is also included in the third outer edge portion 35 b of the third end portion 35 and the fourth outer edge portion 36 b of the fourth end portion 36.　　[0107] The second intermediate portion 37 has a second concave portion 37c on the surface facing the first inner link piece 13 in a state where the chain 7 is attached to the bicycle 1. For example, the second recess 37c is formed in a concave shape in a direction away from the first inner link piece 13. The direction away from the first inner link piece 13 here is along the axial direction with respect to the first central axis X1 and/or the axial direction with respect to the second central axis X2.　　[0108] Except for the above-mentioned points, the structure of the third end portion 35 is substantially the same as the structure of the first end portion 31. The fourth end 36 and the second end 32 have substantially the same structure. The second intermediate portion 37 and the first intermediate portion 33 have substantially the same structure. [0109] (The first outer link piece and the second outer link piece) The first outer link piece is shown in FIGS. 2 and 3, and the first outer link piece 17 is, for example, longer in one direction. The sheet-shaped member. The first outer link piece 17 is arranged outside the first inner link piece 13 in the axial direction. [0110] As shown in FIGS. 3 and 6, the first outer link piece 17 has a fifth end 41, a sixth end 42, and the fifth end 41 and the sixth end 42 are formed as Integral third middle part 43.　　[0111] The fifth end 41 has the aforementioned first central axis X1. The fifth end 41 is substantially formed in a disk shape. The fifth end 41 is arranged outside the first end 31 in the axial direction in the axial direction with respect to the first central axis X1 (refer to FIG. 3). The fifth end 41 is formed with a fifth hole 41a penetrating in the axial direction with respect to the first central axis X1.　　[0112] The sixth end 42 has the second central axis X2 described above. The sixth end 42 is substantially formed in a disc shape. The sixth end 42 is arranged outside the second end 32 in the axial direction in the axial direction with respect to the second central axis X2 (refer to FIG. 3). The sixth end 42 is formed with a sixth hole 42a penetrating in the axial direction with respect to the second central axis X2. [0113] The first outer link piece 17, in the state where the chain 7 is attached to the bicycle 1, further has a third chamfered portion 43b (second chamfered portion 37b) on the surface facing the second outer link piece 19 An example of). Specifically, in a state where the chain 7 is attached to the bicycle 1, the third intermediate portion 43 has a third chamfered portion 43b.　　[0114] The third chamfered portion 43b is formed by chamfering the corner portion of the outer edge portion 43a of the third intermediate portion 43. For example, the third chamfered portion 43b is formed by chamfering a corner formed by the bottom of the third recessed portion 43c, which will be described later, and the outer edge portion 43a of the third intermediate portion 43. [0115] The first outer link piece 17, in a state where the chain 7 is attached to the bicycle 1, further has a third recess 43c (an example of the second recess 37c) on the surface facing the second outer link piece 19 . Specifically, the third intermediate portion 43 has a third recessed portion 43c. The third recess 43c is formed in a concave shape in a direction away from the second outer link piece 19. The direction away from the second outer link piece 19 here is along the axial direction with respect to the first central axis X1 and/or the axial direction with respect to the second central axis X2.　　[0116] The second outer link piece 　　 As shown in FIGS. 2 and 3, the second outer link piece 19 is, for example, a sheet-like member that is long in one direction. The second outer link piece 19 is arranged outside the second inner link piece 15 in the axial direction. [0117] As shown in FIGS. 3 and 7, the second outer link piece 19 has a seventh end 45, an eighth end 46, and the seventh end 45 and the eighth end 46 are formed as Integral fourth middle section 47. The seventh end 45 has the above-mentioned first central axis X1.　　[0118] The seventh end 45 is substantially formed in a disk shape. The seventh end 45 is arranged outside the third end 35 in the axial direction relative to the first central axis X1 (refer to FIG. 3). The seventh end 45 is formed with a seventh hole 45a penetrating in the axial direction with respect to the first central axis X1.　　[0119] The eighth end 46 has the above-mentioned second central axis X2. The eighth end 46 is substantially formed in a disk shape. The eighth end 46 is arranged outside the fourth end 36 in the axial direction in the axial direction with respect to the second central axis X2 (refer to FIG. 3). The eighth end 46 is formed with an eighth hole 46a penetrating in the axial direction with respect to the second central axis X2. [0120] The second outer link piece 19, in a state where the chain 7 is attached to the bicycle 1, further has a fourth chamfered portion 47b (the second chamfered portion) on the surface facing the first outer link piece 17 one example). Specifically, in the state where the chain 7 is attached to the bicycle, the fourth intermediate portion 47 has a fourth chamfered portion 47b.　　[0121] The fourth chamfered portion 47b is formed by chamfering the corner portion of the outer edge portion 47a of the fourth intermediate portion 47. Specifically, the fourth chamfered portion 47b is formed by chamfering a corner formed by the bottom of the fourth recessed portion 47c, which will be described later, and the outer edge portion 47a of the fourth intermediate portion 47.　　[0122] The second outer link piece 19 further has a fourth recess 47c (an example of the second recess) on the surface facing the first outer link piece 17 when the chain 7 is attached to the bicycle 1. Specifically, the fourth intermediate portion 47 has a fourth recessed portion 47c. The fourth recess 47c is formed in a concave shape in a direction away from the first outer link piece 17. The direction away from the first outer link piece 17 here is along the axial direction with respect to the first central axis X1 and/or the axial direction with respect to the second central axis X2.　　[0123] The maximum axial length MD (refer to Fig. 3) of the first outer link piece 17 and the second outer link piece 19 structured as described above is set as follows. The maximum axial length MD of the first outer link piece 17 and the second outer link piece 19 in the axial direction with respect to the first central axis X1 (and/or the second central axis X2) is 5.62 mm or less.　　[0124] For example, when the number of sprockets of the rear sprocket assembly 5 is 12 or more, the maximum axial length MD of the first outer link piece 17 and the second outer link piece 19 is preferably 5.2 mm or less. For example, when the number of sprockets of the rear sprocket assembly 5 is 12, the maximum axial length MD of the first outer link piece 17 and the second outer link piece 19 is preferably 5.2 mm. [0125] The maximum axial length MD of the first outer link piece 17 and the second outer link piece 19 is the outer surface of the first outer link piece 17 on the opposite side of the first inner link piece 13, and the second outer link piece 17 The distance between the outer surfaces of the second outer link piece 19 on the opposite side of the inner link piece 15. [0126] (The first connecting pin and the second connecting pin) "As shown in Figure 2, the first connecting pin 21 and the second connecting pin 23 connect the first inner link piece 13, the second inner link piece 15, The first outer link piece 17 and the second outer link piece 19 are connected. [0127] In detail, the first connecting pin 21 connects the first end 31 of the first inner link piece 13, the third end 35 of the second inner link piece 15, and the first outer link piece 17. The fifth end 41 and the seventh end 45 of the second outer link piece 19 are connected.　　[0128] For example, the first chain roller 9 is arranged on the outer periphery of the first annular portion 31c of the first end portion 31 and the third annular portion 35c of the third end portion 35. In this state, the first connecting pin 21 is inserted through: the inner peripheral portion of the first hole portion 31a and the first annular portion 31c of the first end portion 31, and the third hole portion 35a and the third hole portion 35a of the third end portion 35 3 the inner peripheral surface of the annular portion 35c; and the fifth hole portion 41a of the fifth end portion 41 and the seventh hole portion 45a of the seventh end portion 45 are fitted. [0129] The second connecting pin 23 connects the second end 32 of the first inner link piece 13, the fourth end 36 of the second inner link piece 15, and the sixth end of the first outer link piece 17. 42. The eighth end 46 of the second outer link piece 19 is connected.　　[0130] For example, the second chain roller 11 is arranged on the outer peripheral portion of the second annular portion 32c of the second end portion 32 and the fourth annular portion 36c of the fourth end portion 36. In this state, the second connecting pin 23 is inserted through: the second hole portion 32a of the second end portion 32 and the inner peripheral portion of the second annular portion 32c, and the fourth hole portion 36a and the fourth hole portion of the fourth end portion 36 The inner peripheral surface of the ring portion 36c; and the sixth hole portion 42a of the sixth end portion 42 and the eighth hole portion 46a of the eighth end portion 46 are fitted.　　[0131] As described above, the chain 7 is assembled by attaching the first connecting pin 21 and the second connecting pin 23 to each link piece.　　[0132] <Other Embodiments> 　　 Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various changes can be made without departing from the scope of the invention. In particular, the items described in this manual can be combined arbitrarily as needed. [0133] (a) In the above embodiment, at least a part of the first outer edge portion 31b is shown as an example in which at least a part of the first outer edge portion 31b is arranged outside the first chain roller 9 in the radial direction with respect to the first central axis X1 . [0134] In place of this method, as shown in FIGS. 8 to 11, the second outer edge portion 31b in the first region R1 and the third outer edge portion 35b in the third region R3 are set relative to The radial direction of the first center axis X1 is arranged inside the first chain roller 9. The second outer edge portion 32b in the second region R2 and the fourth outer edge portion 36b in the fourth region R4 may be arranged on the second chain roller 11 in the radial direction with respect to the second central axis X2. Inside. [0135] (b) In the above embodiment, it is shown that the first inner link piece 13 and the second inner link piece 15, and the first chain roller are defined by the first to fourth radial distances D1 to D4. An example of the case of the relationship between the sub 9 and the second chain roller 11.　　[0136] This method can also be replaced by the first and second radial distances D1 and D2 to define the relationship between the first inner link piece 13, the first chain roller 9, and the second chain roller 11. In this case, the second inner link piece 15 is arranged on the bicycle 1 side, and the conditions of the third and fourth radial distances D3 and D4 do not need to comply with the above-mentioned embodiment.　　[0137] The third and fourth radial distances D3 and D4 can also be used to define the relationship between the first inner link piece 15, the first chain roller 9, and the second chain roller 11. In this case, the first inner link piece 13 is arranged on the bicycle 1 side, and the conditions of the first and second radial distances D1 and D2 do not need to meet the above-mentioned embodiment.

[0138]7‧‧‧Chain 9‧‧‧The first chain roller 11‧‧‧The second chain roller 13‧‧‧The first inner link piece 15‧‧‧The second inner link piece 17‧‧‧ The first outer link piece 19‧‧‧The second outer link piece 31‧‧‧The first end 31b‧‧‧The first outer edge 31c‧‧‧The first ring 32‧‧‧The second end 32b‧‧‧Second outer edge portion 32c‧‧‧Second ring portion 33‧‧‧First intermediate portion 33b‧‧‧First chamfered portion 33c‧‧‧First concave portion 35‧‧‧Third end portion 35b‧‧‧3rd outer edge part 35c‧‧‧3rd ring part 36‧‧‧4th end part 36b‧‧‧4th outer edge part 36c‧‧‧4th ring part 37‧‧‧Second Intermediate portion 37b‧‧‧Second chamfered portion 37c‧‧‧Second recessed portion 41‧‧‧Fifth end 42‧‧‧Sixth end 43‧‧‧ Third intermediate portion 43b‧‧‧Third chamfer Section 43c‧‧‧The third recessed portion 45‧‧‧The seventh end 46‧‧‧The eighth end 47‧‧‧The fourth intermediate portion 47b‧‧ The fourth chamfered portion 47c‧‧‧The fourth recessed portion X1‧ ‧‧The first central axis X2‧‧‧The second central axis D1~D4‧‧‧The first to fourth radial distances d1~d4‧‧‧The first to fourth minimum axial length L1 1Reference line L2‧‧‧The second reference line L3‧‧‧The third reference line MD‧‧‧Maximum axial length R1‧‧‧The first area R2‧‧‧The second area R3‧‧‧The third area R4‧ ‧‧The 4th zone SC1‧‧‧The rotation axis of the sprocket

[0046] "Figure 1" is a side view of a bicycle according to an embodiment of the present invention.　　 Figure 2 is a partial enlarged perspective view of the chain.　　 Picture 3 is a top view of the chain.　　 Figure 4 is a side view of the first inner link piece.　　 Figure 5 is a side view of the second inner link piece.　　 Figure 6 is a side view of the first outer link piece.　　 Figure 7 is a side view of the second outer link piece.　　 Figure 8 is a side view of a first inner link piece according to another embodiment of the present invention.　　 Figure 9 is a side view of a second inner link piece according to another embodiment of the present invention.　　 Figure 10 is a side view of a first inner link piece according to another embodiment of the present invention.　　 Figure 11 is a side view of a second inner link piece according to another embodiment of the present invention.

9‧‧‧The first chain roller

11‧‧‧2nd chain roller

13‧‧‧The first inner link piece

31‧‧‧The first end

31a‧‧‧The first hole

31b‧‧‧The first outer edge

31c‧‧‧The first ring part

32‧‧‧2nd end

32a‧‧‧Second hole

32b‧‧‧2nd outer edge

32c‧‧‧Second ring part

33‧‧‧The first middle part

33a‧‧‧Outer edge

33b‧‧‧First chamfer

33c‧‧‧The first recess

X1‧‧‧The first center axis

X2‧‧‧2nd central axis

D1, D2‧‧‧The first and second radial distance

d1, d2‧‧‧The first and second minimum axial length

L1‧‧‧The first reference line

L2‧‧‧Second reference line

L3‧‧‧3rd reference line

R1‧‧‧Region 1

R2‧‧‧Region 2

Claims (19)

A bicycle chain, comprising: a first chain roller, a second chain roller, and a first inner link piece; The first inner link piece includes a first end and a second end; 　　the first end has a first central axis and is used to support the first chain roller; the second end has a second center The shaft is used to support the second chain roller; 　　the first end has a first outer edge; 　　at least a part of the first outer edge is arranged in the radial direction with respect to the first central axis Either the outer side and the inner side of the first chain roller; 　　 The radial distance between at least a part of the first outer edge portion and the outer peripheral surface of the first chain roller is greater than 0 mm and 0.2 mm or less. A bicycle chain, comprising: a first chain roller, a second chain roller, and a first inner link piece; 1 The inner link piece includes a first end and a second end; 　　The first end has a first central axis and is used to support the first chain roller; the second end has a second central shaft And used to support the second chain roller; 　　 in the axial direction relative to the first central axis, the minimum axial length of the first end is 0.79mm or less; 　　 the first end has a first outer edge　　 The radial distance between at least a part of the first outer edge portion and the outer peripheral surface of the first chain roller is 0 mm or more and 0.2 mm or less. For example, the bicycle chain of item 1 or 2 of the scope of patent application, which is further provided with a second inner link piece; 　　 the second inner link piece, when mounted on the bicycle, is relative to the first central axis The axis direction of the center is arranged at a distance from the first inner link piece; 　　The first chain roller and the second chain roller are arranged in the first inner link piece and the first inner link piece in the axial direction 2 between the inner connecting rod pieces. For example, the bicycle chain of item 3 of the scope of patent application, wherein the first inner link piece includes: an intermediate portion connecting the first end and the second end; 　　 the intermediate portion is mounted on the bicycle In the state, the surface facing the second inner link piece has a first chamfered portion. For example, the bicycle chain of item 3 of the scope of patent application, wherein the first inner link piece includes: an intermediate portion connecting the first end and the second end; 　　 the intermediate portion is mounted on the bicycle In the state, the surface facing the second inner link piece has a first recess. For example, the bicycle chain of item 3 of the scope of patent application, which is further equipped with: a first outer link piece, a second outer link piece; Between the axial direction of the first outer link piece and the second inner link piece; 　　 the second inner link piece, when mounted on the bicycle, is arranged between the second outer link piece and the first Between the axial directions of the inner connecting rod pieces. For example, the bicycle chain of item 6 of the scope of patent application, wherein the first outer link piece has a second chamfered portion on the surface facing the second outer link piece in the state of being attached to the bicycle . For example, in the bicycle chain of claim 6, wherein the first outer link piece has a second recessed portion on the surface facing the second outer link piece when the first outer link piece is attached to the bicycle. A bicycle chain, comprising: a first chain roller and a second chain roller, a first inner link piece, and a second inner link piece; 　　 the first chain roller and the second chain roller are arranged as Are separated from each other by an interval; 　　 the first inner link piece includes: a first end, a second end, and a middle portion; 　　 the first end has a first central axis and is used to support the first chain roller; The second end portion has a second center axis and is used to support the second chain roller; the middle portion is used to connect the first end portion and the second end portion; 　　the second inner link piece, In the state of being attached to the bicycle, it is arranged at a distance from the first inner link piece in the axial direction with respect to the first central axis; 　　The intermediate part, in the state of being attached to the bicycle, is in contact with the first inner link. 2 The facing face of the inner link piece has a first recess; 　　The first end has a first outer edge; 　　The radial direction between at least a part of the first outer edge and the outer circumferential surface of the first chain roller The distance is 0 mm or more and 0.2 mm or less. For example, the bicycle chain of items 1, 2 or 9 in the scope of patent application, wherein the first end has a ring part; 　　 the ring part is arranged to face the inner peripheral surface of the first chain roller, and Used to support the first chain roller; 　　 The radial distance, when the first chain roller is in contact with the annular portion toward the longitudinal direction of the first inner link, is relative to the first center The distance between at least a part of the first outer edge portion and the outer peripheral surface of the first chain roller when the first chain roller and the first inner link are viewed in the axial direction of the shaft center. For example, the bicycle chain of item 10 of the scope of patent application, wherein the longitudinal direction is defined as: from either of the first center axis and the second center axis toward the first center axis and the second center The direction of either side of the axis. For example, the bicycle chain of items 1, 2 or 9 in the scope of patent application, wherein the above-mentioned radial distance is 0.1mm. For example, the bicycle chain of item 1, 2 or 9 of the scope of patent application, wherein the area used to define the above-mentioned radial distance is defined by the first reference line and the second reference line; 　　 the above-mentioned first reference line, when When viewing the first chain roller and the first inner link in the axial direction with respect to the first central axis, they pass through the first central axis and the second central axis; 　　 the second reference line, which The angle with respect to the first reference line is less than 180 degrees and extends from the first central axis toward the radially outer side; “the above-mentioned radial distance is defined in the above-mentioned region. For example, the bicycle chain of item 13 of the scope of patent application, wherein the second reference line is perpendicular to the first reference line. For example, the bicycle chain of item 13 of the scope of patent application, wherein, in the state of being mounted on the bicycle, the second reference line extends toward the rotation axis of the sprocket of the bicycle. For example, the bicycle chain of item 9 of the scope of patent application, which is further equipped with: a first outer link piece and a second outer link piece; Between the axial direction of the first outer link piece and the second inner link piece; 　　 the second inner link piece, when mounted on the bicycle, is arranged between the second outer link piece and the first Between the axial directions of the inner connecting rod pieces. For example, the bicycle chain according to the scope of the patent application, wherein the first outer link piece has a second chamfered portion on the surface facing the second outer link piece when the first outer link piece is mounted on the bicycle . For example, in the bicycle chain of the 16th patent application, the first outer link piece has a second recessed portion on the surface facing the second outer link piece in a state of being attached to the bicycle. For example, the bicycle chain of items 1, 2 or 9 in the scope of the patent application, wherein the maximum axial length relative to the first central axis in the axial direction is 5.62 mm or less.

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