Locking device

Abstract

The rear sprocket assembly includes a first sprocket and a locking device. The locking device includes a first locking member and a second locking member. The first locking member includes a first axial end and a second axial end. The second locking member includes a third axial end and a fourth axial end. The third axial end portion is configured to be attached to the second axial end portion of the first locking member in an assembled state in which the first sprocket and the locking device are assembled into one unit. The fourth axial end has at least one radial projection configured to abut the first sprocket in the axial direction in the mounted state. The locking device is configured such that the first sprocket is slidable relative to the locking device in an assembled state and in an installed state in an axial direction.

Description

[0001] This application is a divisional application of the invention application filed on April 11, 2022, with application number CN202210374120.2 and invention name “Rear sprocket assembly and locking device”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application is a continuation-in-part of U.S. patent application No. 17 / 244,862 filed on April 29, 2021. The contents of that application are incorporated herein by reference in their entirety. Technical Field

[0004] The invention relates to a rear sprocket assembly and a locking device. Background Art

[0005] The human-powered vehicle includes a sprocket assembly configured to engage with a chain. The sprocket assembly includes a plurality of sprockets. The plurality of sprockets includes a smallest sprocket. The smallest sprocket preferably has a smaller number of teeth to provide a wider gear range of the rear sprocket assembly. However, a smaller number of teeth may make the smallest sprocket more difficult to install on the hub assembly. Summary of the invention

[0006] According to a first aspect of the present invention, a rear sprocket assembly is configured to be mounted to a rear hub assembly for a human-powered vehicle. The rear sprocket assembly includes a first sprocket and a locking device. The first sprocket is the smallest sprocket in the rear sprocket assembly and includes a first sprocket body, a plurality of first sprocket teeth, and a first sprocket opening. The plurality of first sprocket teeth extend radially outward from the first sprocket body in a radial direction relative to a rotation center axis of the rear sprocket assembly. The first sprocket opening is configured to receive a hub axle of the rear hub assembly in a mounted state in which the rear sprocket assembly is mounted to the rear hub assembly. The first sprocket opening has a first radial minimum diameter, which is smaller than the outermost diameter of a sprocket support body of the rear hub assembly. The locking device is configured to fix the rear sprocket assembly to the sprocket support body of the rear hub assembly in the mounted state. The locking device includes a first locking member and a second locking member. The first locking member includes a first axial end and a second axial end. The first axial end is configured to be detachably attached to the sprocket support body of the rear hub assembly in the mounted state. The second axial end is opposite to the first axial end in the axial direction relative to the rotation center axis. The second locking member includes a third axial end and a fourth axial end. The third axial end is configured to be attached to the second axial end of the first locking member in an assembled state in which the first sprocket and the locking device are assembled into one unit. The fourth axial end is opposite to the third axial end in the axial direction and has at least one radial protrusion, which is configured to abut the first sprocket in the axial direction in the installed state. The locking device is configured so that the first sprocket is slidable relative to the locking device along the axial direction in the assembled state and before the installed state.

[0007] With the rear sprocket assembly according to the first aspect, the locking device makes the smallest sprocket slidable in the axial direction relative to the locking device in the assembled state and before the mounted state. Therefore, if the smaller sprocket is too small to be directly mounted on the sprocket support body, the smallest sprocket can be smoothly mounted on the sprocket support body of the rear hub assembly by the locking device. Therefore, a rear sprocket assembly with a wider gear range can be provided, while the first sprocket can be smoothly mounted to the rear hub assembly.

[0008] According to a second aspect of the present invention, the rear sprocket assembly according to the first aspect is configured so that the first axial end portion has a first thread configured to threadably engage with a thread of the sprocket support body provided to the rear hub assembly in the mounted state.

[0009] With the rear sprocket assembly according to the second aspect, the first thread of the first locking member enables the locking device to be easily attached to and detached from the sprocket support body of the rear hub assembly.

[0010] According to a third aspect of the present invention, the rear sprocket assembly according to the second aspect is configured so that the second axial end portion has a second thread. The third axial end portion has a third thread configured to threadably engage with the second thread of the first locking member in the assembled state.

[0011] With the rear sprocket assembly according to the third aspect, the second thread of the first locking member and the third thread of the second locking member enable the first locking member and the second locking member to be easily attached to and detached from each other.

[0012] According to a fourth aspect of the present invention, the rear sprocket assembly according to the third aspect is configured so that the first locking member includes a first surface facing radially outward in the radial direction. The first surface is adjacent to the first thread. The second locking member includes a second surface facing radially outward in the radial direction. The second surface is adjacent to the third thread. The first surface is arranged radially outward from the second surface in the radial direction in the assembled state.

[0013] With the rear sprocket assembly according to the fourth aspect, the second surface can be arranged radially inward from the first surface relative to the rotation center axis in the assembled state. Therefore, the second surface can be arranged more radially inward, thereby expanding the space radially arranged between the second surface and at least one of the first sprocket and the adjacent sprocket. Therefore, the discharge of foreign matter such as mud in the space radially arranged between the second surface and at least one of the first sprocket and the adjacent sprocket can be improved.

[0014] In accordance with a fifth aspect of the present invention, the rear sprocket assembly according to the fourth aspect is configured so that the second surface is provided between the third thread and the at least one radial protrusion.

[0015] With the rear sprocket assembly according to the fifth aspect, the second surface can be arranged further radially inward, thereby expanding the space radially arranged between the second surface and the first sprocket. Therefore, the discharge of foreign matter such as mud in the space radially arranged between the second surface and the first sprocket can be improved.

[0016] According to a sixth aspect of the present invention, the rear sprocket assembly according to the fifth aspect is configured so that the first thread of the first locking member extends radially outward from the first surface in the radial direction. The first thread has a first radial maximum thread diameter. The at least one radial protrusion of the second locking member extends radially outward from the second surface in the radial direction. The at least one radial protrusion has a radial maximum protrusion diameter. The first radial minimum diameter of the first sprocket opening is smaller than each of the first radial maximum thread diameter of the first thread and the radial maximum protrusion diameter of the at least one radial protrusion.

[0017] With the rear sprocket assembly according to the sixth aspect, the first sprocket and the locking device can be assembled into one unit so that the first sprocket can be easily attached to and detached from the sprocket support body of the rear sprocket assembly.

[0018] According to a seventh aspect of the present invention, the rear sprocket assembly according to any one of the fourth to sixth aspects is configured so that the first sprocket has a first radially smallest portion defining the first radially smallest diameter of the first sprocket opening, and the first radially smallest portion of the first sprocket is disposed radially outside the second surface in the assembled state.

[0019] With the rear sprocket assembly according to the seventh aspect, the space radially disposed between the second surface and the first sprocket can be enlarged. Therefore, the discharge of foreign matter such as mud in the space radially disposed between the second surface and the first sprocket can be improved.

[0020] According to an eighth aspect of the present invention, the rear sprocket assembly according to any one of the second to seventh aspects is configured so that the first sprocket is slidable along the axial direction between the first thread of the first locking member and the at least one radial protrusion of the second locking member in the assembled state.

[0021] With the rear sprocket assembly according to the eighth aspect, the rotational position of the first sprocket relative to the sprocket support body of the rear hub assembly can be adjusted in the circumferential direction with respect to the rotational center axis of the rear sprocket assembly.

[0022] According to a ninth aspect of the present invention, the rear sprocket assembly according to any one of the first to eighth aspects is configured such that the first axial end of the first locking member includes a first tool engagement profile. The fourth axial end of the second locking member includes a second tool engagement profile.

[0023] With the rear sprocket assembly according to the ninth aspect, the first locking member and the second locking member can be easily assembled using the first tool engagement profile and the second tool engagement profile.

[0024] According to the tenth aspect of the present invention, the rear sprocket assembly according to any one of the second to ninth aspects is configured so that the locking device is configured to set the first sprocket between the first thread of the first locking member and the at least one radial protrusion of the second locking member along the axial direction in the assembled state.

[0025] With the rear sprocket assembly according to the tenth aspect, the rotational position of the first sprocket relative to the sprocket support body of the rear hub assembly can be adjusted in the circumferential direction with respect to the rotational center axis of the rear sprocket assembly.

[0026] According to an eleventh aspect of the present invention, the rear sprocket assembly according to any one of the first to tenth aspects is configured so that the first locking member has an axial contact surface configured to contact the third axial end portion of the second locking member in the assembled state.

[0027] With the rear sprocket assembly according to the eleventh aspect, when the first locking member and the second locking member are assembled to the sprocket support body, it is possible to provide a preferred bonding strength between the locking device and the sprocket support body.

[0028] According to the twelfth aspect of the present invention, the rear sprocket assembly according to any one of the first to eleventh aspects is configured so that the first sprocket has a first axially outward surface and a first axially inward surface. The first axially outward surface and the first axially inward surface face opposite directions to each other in the axial direction. The first axially inward surface is configured to face the axial center plane of the human-powered vehicle in the installed state. The first sprocket includes a first axially inward torque transmission profile set to the first axially inward surface. The first axially inward torque transmission profile is configured to engage with a second axially outward torque transmission profile of a second sprocket adjacent to the first sprocket in a torque transmission manner in the installed state, and in the axial direction, there is no other sprocket between the first sprocket and the second sprocket.

[0029] With the rear sprocket assembly according to the twelfth aspect, the rotational force can be reliably transmitted between the first sprocket and the second sprocket.

[0030] According to a thirteenth aspect of the present invention, the rear sprocket assembly according to any one of the first to twelfth aspects is configured so that the third axial end of the second locking member is configured to be detachably attached to the second axial end of the first locking member in the assembled state.

[0031] Using the rear sprocket assembly according to the thirteenth aspect, even if at least one of the first locking member and the second locking member includes a large diameter portion having a large outer diameter, which is larger than the inner diameter of the first sprocket, the first sprocket and the locking device can be assembled into a unit, and / or the first sprocket can be replaced with a new sprocket when the first locking member is separated from the second locking member.

[0032] According to a fourteenth aspect of the present invention, a rear sprocket assembly is configured to be mounted to a rear hub assembly for a human-powered vehicle. The rear sprocket assembly includes a first sprocket and a locking device. The first sprocket is the smallest sprocket in the rear sprocket assembly and includes a first sprocket body, a plurality of first sprocket teeth, and a first sprocket opening. The plurality of first sprocket teeth extend radially outward from the first sprocket body in a radial direction relative to a rotation center axis of the rear sprocket assembly. The first sprocket opening is configured to receive a hub axle of the rear hub assembly when the rear sprocket assembly is mounted to the rear hub assembly. The first sprocket opening has a first radial minimum diameter, which is smaller than the outermost diameter of the sprocket support body of the rear hub assembly. The locking device is configured to fix the rear sprocket assembly to the sprocket support body of the rear hub assembly in the mounted state. The locking device includes an axially inward end and an axially outward end. The axially inward end has a first thread, which is configured to be threadedly engaged with a thread provided on the sprocket support body of the rear hub assembly in the mounted state. The first thread has a first radial maximum thread diameter. The axially outward end is opposite to the axially inward end in the axial direction and has at least one radial protrusion, which is configured to abut the first sprocket in the axial direction in the installed state. The at least one radial protrusion has a radial maximum protrusion diameter. The first radial minimum diameter of the first sprocket opening is smaller than each of the first radial maximum thread diameter of the first thread and the radial maximum protrusion diameter of the at least one radial protrusion. The locking device is configured so that the first sprocket is slidable relative to the locking device in the axial direction in the assembled state and before the installed state.

[0033] With the rear sprocket assembly according to the fourteenth aspect, the locking device makes the smallest sprocket slidable in the axial direction relative to the locking device in the assembled state and before the mounted state. Therefore, if the smaller sprocket is too small to be directly mounted on the sprocket support body, the smallest sprocket can be smoothly mounted on the sprocket support body of the rear hub assembly by the locking device. Therefore, a rear sprocket assembly with a wider gear range can be provided, while the first sprocket can be smoothly mounted to the rear hub assembly.

[0034] According to a fifteenth aspect of the present invention, the rear sprocket assembly according to the fourteenth aspect is configured so that the locking device is a one-piece integral member.

[0035] With the rear sprocket assembly according to the fifteenth aspect, the strength of the locking device can be improved.

[0036] In accordance with a sixteenth aspect of the present invention, the rear sprocket assembly according to the fifteenth aspect is configured so that the at least one radial protrusion of the locking device is formed by material deformation.

[0037] With the rear sprocket assembly according to the sixteenth aspect, even if at least one of the locking devices includes a large diameter portion having a large outer diameter that is larger than the inner diameter of the first sprocket, the first sprocket and the locking device can be assembled as one unit.

[0038] According to the seventeenth aspect of the present invention, a locking device for mounting a plurality of rear sprockets to a rear hub assembly for a human-powered vehicle comprises a first locking member and a second locking member. The first locking member comprises a first axial end, a second axial end and a first surface. The first axial end is configured to be detachably attached to the sprocket support body of the rear hub assembly in a mounted state in which the plurality of rear sprockets are mounted to the rear hub assembly. The second axial end is opposite to the first axial end in an axial direction relative to the rotation center axis of the plurality of rear sprockets. The first surface faces radially outward in a radial direction relative to the rotation center axis. The second locking member comprises a third axial end, a fourth axial end and a second surface. The third axial end is configured to be attached to the second axial end of the first locking member in an assembled state in which the smallest sprocket and the locking device are assembled into a unit. The fourth axial end is opposite to the third axial end in the axial direction and has at least one radial protrusion. The second surface faces radially outward in the radial direction. The second surface is adjacent to the at least one radial protrusion in the axial direction. The at least one radial protrusion of the second locking member extends radially outward from the second surface in the radial direction and is configured to abut the smallest sprocket of the plurality of rear sprockets in the axial direction in the installed state. The first surface is disposed radially outward from the second surface in the radial direction in the assembled state. The plurality of rear sprockets include an adjacent sprocket adjacent to the smallest sprocket, and there is no other sprocket between the adjacent sprocket and the smallest sprocket in the axial direction. The locking device is configured so that the adjacent sprockets are slidable relative to the locking device in the axial direction in a space disposed radially outward from the first and second surfaces in the assembled state and before the installed state.

[0039] With the locking device according to the seventeenth aspect, the adjacent sprockets are slidable in the axial direction relative to the locking device in the space provided radially outside the first surface and the second surface in the assembled state and before the mounted state. Therefore, if at least one of the smaller sprocket and the adjacent sprocket is too small to be directly mounted on the sprocket support body, at least one of the smallest sprocket and the adjacent sprocket can be smoothly mounted on the sprocket support body of the rear hub assembly by the locking device. Therefore, a rear sprocket assembly having a wider gear range can be provided while at least one of the smallest sprocket and the adjacent sprocket can be smoothly mounted to the rear hub assembly.

[0040] According to an eighteenth aspect of the present invention, the locking device according to the seventeenth aspect is configured so that the locking device is configured so that the smallest sprocket is stationary relative to the locking device in the axial direction in the assembled state.

[0041] With the locking device according to the eighteenth aspect, the size of the locking device in the axial direction can be reduced while at least one of the smallest sprocket and the adjacent sprocket can be smoothly mounted to the rear hub assembly.

[0042] According to the nineteenth aspect of the present invention, the locking device according to the seventeenth or eighteenth aspect is configured so that the first axial end has a first thread, and the first thread is configured to be threadedly engaged with a thread of the sprocket support body provided to the rear hub assembly in the installed state.

[0043] With the rear sprocket assembly according to the nineteenth aspect, the first thread of the first locking member enables the locking device to be easily attached to and detached from the sprocket supporting body of the rear hub assembly.

[0044] According to the twentieth aspect of the present invention, the locking device according to any one of aspects 17 to 19 is configured so that the third axial end of the second locking member is configured to be detachably attached to the second axial end of the first locking member in the assembled state.

[0045] Using the rear sprocket assembly according to the twentieth aspect, even if at least one of the first locking member and the second locking member includes a large diameter portion having a large outer diameter, which is larger than the inner diameter of the smallest sprocket, the smallest sprocket and the locking device can be assembled into a unit, and / or the smallest sprocket can be replaced with a new sprocket when the first locking member is separated from the second locking member. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] A more complete understanding of the present invention and many of its attendant advantages will be readily obtained by referring to the following detailed description when considered in conjunction with the accompanying drawings.

[0047] Figure 1 is a schematic diagram of a human powered vehicle including a rear sprocket assembly according to one embodiment.

[0048] Figure 2 yes Figure 1 An exploded rear view of the rear sprocket assembly and rear hub assembly of a human powered vehicle is shown.

[0049] Figure 3 yes Figure 2 A cross-sectional view of the rear sprocket assembly and rear hub assembly is shown.

[0050] Figure 4 yes Figure 2 A side elevation view of a sprocket of a rear sprocket assembly is shown.

[0051] Figure 5 yes Figure 2 Another side elevation view of the sprocket of the rear sprocket assembly is shown.

[0052] Figure 6 yes Figure 2 A partial cross-sectional view of the rear sprocket assembly and rear hub assembly is shown.

[0053] Figure 7 yes Figure 2 An exploded perspective view of the locking device assembly of the rear sprocket assembly is shown.

[0054] Figure 8 yes Figure 2 Another exploded perspective view of the locking device assembly of the rear sprocket assembly is shown.

[0055] Fig. 9 yes Figure 2 An exploded perspective view of a portion of a locking device assembly of a rear sprocket assembly is shown.

[0056] Fig.10 yes Figure 2 Another exploded perspective view of a portion of the locking device assembly of the rear sprocket assembly is shown.

[0057] Fig.11 yes Figure 7 A perspective view of a tooth position retaining member of a locking device assembly is shown.

[0058] Fig.12 yes Figure 7 Another perspective view of the tooth position retaining component of the locking device assembly is shown.

[0059] Fig.13 yes Figure 7 A side elevation view of the locking device assembly is shown with the locking device omitted.

[0060] Fig.14 yes Figure 2 Another partial cross-sectional view of the rear sprocket assembly and rear hub assembly shown.

[0061] Fig.15 yes Figure 2 A perspective view of a sprocket of a rear sprocket assembly is shown.

[0062] Fig.16 yes Figure 2 A cross-section of the rear sprocket assembly and rear hub assembly is shown to illustrate the assembly process.

[0063] Fig.17 yes Figure 2A cross-section of the rear sprocket assembly and rear hub assembly is shown to illustrate the assembly process.

[0064] Fig.18 yes Figure 2 A cross-section of the rear sprocket assembly and rear hub assembly is shown to illustrate the assembly process.

[0065] Fig.19 is a perspective cross-sectional view of a rear sprocket assembly according to a modified example.

[0066] Fig. 20 is a perspective cross-sectional view of a rear sprocket assembly according to another modified example.

[0067] Fig.21 is a perspective cross-sectional view of a rear sprocket assembly according to another variant

[0068] Fig. 22 is a cross-sectional view of a rear sprocket assembly having a rear hub assembly according to another variation.

[0069] Fig.23 yes Fig. 22 A partial cross-sectional view of the rear sprocket assembly and rear hub assembly is shown.

[0070] Fig.24 yes Fig. 22 An exploded perspective view of a portion of a locking device assembly of a rear sprocket assembly is shown.

[0071] Fig.25 yes Fig. 22 A partial cross-sectional view of the rear sprocket assembly and rear hub assembly is shown.

[0072] Fig.26 is based on Figure 3 A partial cross-sectional view of a rear sprocket assembly of another variation of the illustrated embodiment.

[0073] Fig. 27 is based on Fig. 22 A partial cross-sectional view of a rear sprocket assembly of another variation of the illustrated embodiment. DETAILED DESCRIPTION

[0074] Embodiments will now be described with reference to the drawings, wherein like reference numerals designate corresponding or identical elements throughout the various drawings.

[0075] like Figure 1As shown, the human-powered vehicle 2 includes a vehicle body 4 and a transmission system 6. The transmission system 6 includes a rear sprocket assembly 10 and a rear hub assembly 12. The rear hub assembly 12 is fixed to the vehicle body 4. The rear sprocket assembly 10 is configured to be mounted to the rear hub assembly 12 for the human-powered vehicle 2. The rear sprocket assembly 10 is rotatably supported by the rear hub assembly 12 relative to the vehicle body 4 around the rotation center axis A1. The human-powered vehicle 2 has an axial center plane CP. The axial center plane CP is defined at a lateral center position of the vehicle body 4 of the human-powered vehicle 2. The axial center plane CP is perpendicular to the rotation center axis A1.

[0076] The transmission system 6 includes a crank assembly 6A, a front sprocket 6B, and a chain C. The crank assembly 6A is rotatably mounted to the vehicle body 4. The front sprocket 6B is fixed to the crank assembly 6A. The chain C is engaged with the front sprocket 6B and the rear sprocket assembly 10 to transmit the pedaling force from the front sprocket 6B to the rear sprocket assembly 10. In the present embodiment, the front sprocket 6B includes a single sprocket. However, the front sprocket 6B may include a plurality of sprockets.

[0077] In this application, the following directional terms "front", "rear", "forward", "rearward", "left", "right", "lateral", "upward", and "downward", and any other similar directional terms refer to those directions based on a user (e.g., a rider) in a standard user position (e.g., on a saddle or seat) in the human-powered vehicle 2 and facing the handlebars or steering gear. Therefore, these terms used to describe the rear sprocket assembly 10, rear hub assembly 12, or other components should be interpreted relative to the use of the human-powered vehicle 2 equipped with the rear sprocket assembly 10, rear hub assembly 12, or other components in an upright riding position on a horizontal surface.

[0078] In the present application, human-powered vehicles include various bicycles, such as mountain bikes, road bikes, city bikes, cargo bikes, hand bikes and recumbent bikes. In addition, human-powered vehicles include electric bicycles (E-bikes). E-bikes include electric-assisted bicycles that are configured to assist the propulsion of the vehicle by an electric motor. However, the total number of wheels of the human-powered vehicle is not limited to two. For example, human-powered vehicles include vehicles with one wheel or three wheels or more wheels. In particular, human-powered vehicles do not include vehicles that use only internal combustion engines as power. Typically, light road vehicles, including vehicles that do not require a public road driving license, are considered human-powered vehicles.

[0079] like Figure 2As shown, the rear sprocket assembly 10 includes a plurality of rear sprockets SP. The plurality of rear sprockets SP are configured to mesh with the chain C. The plurality of rear sprockets SP include a first sprocket SP1 to a twelfth sprocket SP12. That is, the rear sprocket assembly 10 includes a first sprocket SP1 and a second sprocket SP2. However, the total number of the plurality of sprockets SP is not limited to twelve.

[0080] The rear hub assembly 12 includes a hub axle 14, a hub body 16, and a sprocket support body 18. The hub axle 14 is configured to be fixed to the vehicle body 4 of the human-powered vehicle 2 (see, for example, Figure 1 The hub body 16 is rotatably mounted on the hub axle 14 about the rotation center axis A1. The sprocket support body 18 is rotatably mounted on the hub axle 14 about the rotation center axis A1.

[0081] The rear sprocket assembly 10 is configured to be mounted to a sprocket support body 18. The sprocket support body 18 includes a plurality of external spline teeth 18A. The rear sprocket assembly 10 is configured to mesh with the plurality of external spline teeth 18A of the sprocket support body 18.

[0082] like Figure 3 As shown, the rear hub assembly 12 includes a ratchet structure 20. The ratchet structure 20 is configured to allow the sprocket support body 18 to rotate relative to the hub body 16 about the rotation center axis A1 in only one rotation direction. The ratchet structure 20 is configured to restrict the sprocket support body 18 from rotating relative to the hub body 16 about the rotation center axis A1 in another rotation direction.

[0083] The first sprocket SP1 has a first sprocket outer diameter DM1. The second sprocket SP2 has a second sprocket outer diameter DM2 that is larger than the first sprocket outer diameter DM1. The second sprocket SP2 is adjacent to the first sprocket SP1 in the axial direction D1 relative to the rotation center axis A1, and there is no other sprocket between the first sprocket SP1 and the second sprocket SP2. The second sprocket SP2 may also be referred to as an adjacent sprocket SP2. Therefore, the plurality of rear sprockets SP include an adjacent sprocket SP2. In the present embodiment, the first sprocket outer diameter DM1 is the smallest one among the outer diameters of the first sprocket SP1 to the twelfth sprocket SP12. Therefore, the first sprocket SP1 may also be referred to as the smallest sprocket SP1. Therefore, the first sprocket SP1 is the smallest sprocket SP1 in the rear sprocket assembly 10. The first sprocket SP1 may also be referred to as a top stop sprocket SP1. The adjacent sprocket SP2 is adjacent to the smallest sprocket SP1, and there is no other sprocket between the adjacent sprocket SP2 and the smallest sprocket SP1 in the axial direction D1.

[0084] The third sprocket SP3 has a third sprocket outer diameter DM3 greater than the second sprocket outer diameter DM2. The third sprocket SP3 is adjacent to the second sprocket SP2 in the axial direction D1 without another sprocket between the second sprocket SP2 and the third sprocket SP3.

[0085] The rear sprocket assembly 10 includes a sprocket frame 22. The sixth sprocket SP6 to the twelfth sprocket SP12 are mounted on the sprocket frame 22. The sixth sprocket SP6 to the twelfth sprocket SP12 are fixed to the sprocket frame 22 by fasteners 24, such as rivets in this embodiment. However, the total number of sprockets fixed to the sprocket frame 22 is not limited to Figure 3 The sprocket carrier 22 is configured to contact the positioning surface 18C of the sprocket support body 18. However, the structure of the sprocket carrier 22 is not limited to Figure 3 If needed and / or desired, the sprocket carrier 22 can be omitted from the rear sprocket assembly 10. In this case, all sprockets are directly engaged with the sprocket support body 18.

[0086] like Figure 4 As shown, the first sprocket SP1 includes a first sprocket body SPB11, a plurality of first sprocket teeth SPT12 and a first sprocket opening SPO13. The plurality of first sprocket teeth SPT12 extend radially outward from the first sprocket body SPB11 in a radial direction relative to the rotation center axis A1 of the rear sprocket assembly 10. The plurality of first sprocket teeth SPT12 define a first sprocket outer diameter DM1. The first sprocket opening SPO13 of the first sprocket SP1 has a first diameter DM11. The first sprocket SP1 has a first radial minimum portion SP19 defining a first radial minimum diameter DM11 of the first sprocket opening SPO13. In the present embodiment, the total number of the first sprocket teeth SPT12 is nine. However, the total number of the first sprocket teeth SPT12 is not limited to nine.

[0087] like Figure 5 As shown, the second sprocket SP2 includes a second sprocket body SPB21, a plurality of second sprocket teeth SPT22 and a second sprocket opening SPO23. The plurality of second sprocket teeth SPT22 extend radially outward from the second sprocket body SPB21 in a radial direction. The plurality of second sprocket teeth SPT22 define a second sprocket outer diameter DM2. The second sprocket opening SPO23 of the second sprocket SP2 has a second diameter DM21. In the present embodiment, the total number of the second sprocket teeth SPT22 is ten. However, the total number of the second sprocket teeth SPT22 is not limited to ten.

[0088] like Figure 6As shown, the first sprocket opening SPO13 is configured to receive the hub axle 14 of the rear hub assembly 12 in the installed state where the rear sprocket assembly 10 is installed to the rear hub assembly 12. The first diameter DM11 is smaller than the outermost diameter DM6 of the sprocket support body 18 of the rear hub assembly 12. The first diameter DM11 may also be referred to as the first radial minimum diameter DM11. Therefore, the first sprocket opening SPO13 has a first radial minimum diameter DM11, which is smaller than the outermost diameter DM6 of the sprocket support body 18 of the rear hub assembly 12. The plurality of spline teeth 18A define the outermost diameter DM6. However, if needed and / or desired, the first diameter DM11 may be greater than or equal to the outermost diameter DM6 of the sprocket support body 18.

[0089] The second sprocket opening SP023 is configured to receive the hub axle 14 of the rear hub assembly 12 in an installed state. The second diameter DM21 is less than the outermost diameter DM6 of the sprocket support body 18 of the rear hub assembly 12. The second diameter DM21 is greater than the first diameter DM11. However, if needed and / or desired, the second diameter DM21 may be less than or equal to the first diameter DM11. If needed and / or desired, the second diameter DM21 may be greater than or equal to the outermost diameter DM6 of the sprocket support body 18.

[0090] The sprocket support body 18 includes an axial end 18B disposed at the axial outermost end of the sprocket support body 18 in the axial direction D1. The hub axle 14 includes an axial end 14B disposed at the axial outermost end of the hub axle 14 in the axial direction D1. The first sprocket SP1 is configured to be disposed between the axial end 14B and the axial end 18B in the axial direction D1. The second sprocket SP2 is configured to be disposed between the axial end 14B and the axial end 18B in the axial direction D1.

[0091] The rear sprocket assembly 10 includes a locking device 26. The locking device 26 is configured to fix the rear sprocket assembly 10 to the sprocket support body 18 of the rear hub assembly 12 in the installed state. The locking device 26 is configured to install the first sprocket SP1 and the second sprocket SP2 to the rear hub assembly 12. Figure 3 As shown, the locking device 26 is configured to be attached to the sprocket support body 18 to hold the sprocket carrier 22 and the first to fifth sprockets SP1 to SP5 between the locking device 26 and the positioning surface 18C of the sprocket support body 18 in the axial direction D1.

[0092] like Figure 6As shown, the locking device 26 includes an axially inward end 26A and an axially outward end 26B. The axially outward end 26B is opposite to the axially inward end 26A in the axial direction D1. The locking device 26 for mounting a plurality of rear sprockets SP to the rear hub assembly 12 of a human-powered vehicle 2 includes a first locking member 28 and a second locking member 30. The first locking member 28 includes the axially inward end 26A. The second locking member 30 includes the axially outward end 26B.

[0093] The first locking member 28 is configured to detachably engage the sprocket support body 18 of the rear hub assembly 12 in the installed state. The second locking member 30 is configured to detachably engage with the first locking member 28 so as to abut the first sprocket SP1 in the axial direction D1 in the installed state. In the present embodiment, the first locking member 28 is a member separate from the second locking member 30. However, if necessary and / or desired, the first locking member 28 can be integrally provided with the second locking member 30 as a one-piece member.

[0094] The first locking member 28 is configured to be detachably engaged with the axial end 18B of the sprocket support body 18 in the installed state. The first locking member 28 is configured to be at least partially disposed in the second sprocket opening SPO23 in the installed state. The second locking member 30 is configured to be at least partially disposed in the first sprocket opening SPO13 and the second sprocket opening SPO23 in the installed state.

[0095] As used herein, the term "detachable" or "detachably" encompasses a configuration in which one element can be repeatedly detached from and attached to another element without substantial damage.

[0096] like Figure 7 and Figure 8 As shown, the rear sprocket assembly 10 includes at least one tooth position retaining member 32. The at least one tooth position retaining member 32 is configured to retain the relative positions between the plurality of first sprocket teeth SPT12 and the plurality of second sprocket teeth SPT22 in the circumferential direction D2 relative to the rotation center axis A1. In the present embodiment, the rear sprocket assembly 10 includes the tooth position retaining member 32. However, if needed and / or desired, the rear sprocket assembly 10 may include a plurality of tooth position retaining members 32. If needed and / or desired, at least one tooth position retaining member 32 may be omitted from the rear sprocket assembly 10.

[0097] The at least one tooth position holding member 32 includes a fixing portion 34 and at least one guide portion 36. The fixing portion 34 is configured to be fixed to one of the first sprocket SP1 and the second sprocket SP2. The at least one guide portion 36 is configured to be engaged with the other of the first sprocket SP1 and the second sprocket SP2 so that the other of the first sprocket SP1 and the second sprocket SP2 is slidable in the axial direction D1 relative to one of the first sprocket SP1 and the second sprocket SP2.

[0098] In the present embodiment, the tooth position holding member 32 includes a fixing portion 34 and at least one guide portion 36. The fixing portion 34 is fixed to the first sprocket SP1. The fixing portion 34 is fixed to the first sprocket SP1 in a press-fit manner. The fixing portion 34 has an annular shape. The fixing portion 34 includes an opening 34A. However, the shape of the fixing portion is not limited to the annular shape.

[0099] At least one guide portion 36 is configured to engage with the second sprocket SP2 so that the second sprocket SP2 is slidable in the axial direction D1 relative to the first sprocket SP1. However, if necessary and / or desired, at least one guide portion 36 may be configured to engage with the first sprocket SP1. If necessary and / or desired, the fixing portion 34 may be fixed to the second sprocket SP2. The fixing portion 34 may be fixed to one of the first sprocket SP1 and the second sprocket SP2 in a manner other than a press fit. If necessary and / or desired, at least one guide portion 36 may be configured to engage with the first sprocket SP1 so that the first sprocket SP1 is slidable in the axial direction D1 relative to the second sprocket SP2.

[0100] At least one guide portion 36 includes a plurality of guide portions 36. At least one guide portion 36 includes a first guide portion 36A, a second guide portion 36B, and a third guide portion 36C. At least one guide portion 36 extends from the fixed portion 34 in the axial direction D1. The first guide portion 36A, the second guide portion 36B, and the third guide portion 36C extend from the fixed portion 34 in the axial direction D1. The first guide portion 36A, the second guide portion 36B, and the third guide portion 36C are spaced apart from each other in the circumferential direction D2.

[0101] In the present embodiment, the at least one guide portion 36 includes a first guide portion 36A, a second guide portion 36B, a third guide portion 36C, and no other guide portion configured to engage with the second sprocket SP2, so that the second sprocket SP2 is slidable in the axial direction D1 relative to the first sprocket SP1. However, the total number of the at least one guide portion 36 is not limited to three.

[0102] The first guide portion 36A, the second guide portion 36B, and the third guide portion 36C are configured to engage with the second sprocket SP2 so that the second sprocket SP2 is slidable in the axial direction D1 relative to the first sprocket SP1. However, if needed and / or desired, at least one guide portion 36 may be configured to engage with the first sprocket SP1 so that the first sprocket SP1 is slidable in the axial direction D1 relative to the second sprocket SP2.

[0103] like Fig. 9 and Fig.10 As shown, the second sprocket SP2 includes at least one guide groove 37. At least one guide portion 36 is configured to be movably disposed in the at least one guide groove 37 along the axial direction D1. In the present embodiment, the at least one guide groove 37 includes a first guide groove 37A, a second guide groove 37B, and a third guide groove 37C. The first guide groove 37A, the second guide groove 37B, and the third guide groove 37C are spaced apart from each other in the circumferential direction D2. The first guide portion 36A is configured to be movably disposed in the first guide groove 37A along the axial direction D1. The second guide portion 36B is configured to be movably disposed in the second guide groove 37B along the axial direction D1. The third guide portion 36C is configured to be movably disposed in the third guide groove 37C along the axial direction D1.

[0104] If needed and / or desired, the at least one tooth position holding member 32 may include a plurality of tooth position holding members. In such an embodiment, the tooth position holding members are separate members from each other. Each tooth position holding member includes a fixing portion 34 and at least one guide portion 36. In addition, if needed and / or desired, the at least one tooth position holding member 32 and one of the first sprocket SP1 and the second sprocket SP2 may be integrally provided with each other as an integral member.

[0105] like Fig.11 and Fig.12 As shown, at least one guide portion 36 is disposed radially outward from the fixing portion 34 in the radial direction. The first guide portion 36A is disposed radially outward from the fixing portion 34 in the radial direction. The second guide portion 36B is disposed radially outward from the fixing portion 34 in the radial direction. The third guide portion 36C is disposed radially outward from the fixing portion 34 in the radial direction.

[0106] At least one guide portion 36 extends in the axial direction D1. The first guide portion 36A extends in the axial direction D1. The second guide portion 36B extends in the axial direction D1. The third guide portion 36C extends in the axial direction D1.

[0107] At least one guide portion 36 extends in the circumferential direction D2. The first guide portion 36A extends in the circumferential direction D2. The second guide portion 36B extends in the circumferential direction D2. The third guide portion 36C extends in the circumferential direction D2.

[0108] The at least one tooth position holding member 32 includes at least one connecting portion 38. The at least one connecting portion 38 connects the at least one guide portion 36 to the fixing portion 34. The at least one connecting portion 38 extends in a direction intersecting the rotation center axis A1.

[0109] The at least one connecting portion 38 includes a plurality of connecting portions 38. The plurality of connecting portions 38 include a first connecting portion 38A, a second connecting portion 38B, and a third connecting portion 38C. The first connecting portion 38A connects the first guide portion 36A to the fixed portion 34. The second connecting portion 38B connects the second guide portion 36B to the fixed portion 34. The third connecting portion 38C connects the third guide portion 36C to the fixed portion 34.

[0110] The first connection portion 38A extends from the fixing portion 34 to the first guide portion 36A in the axial direction D1. The first connection portion 38A extends from the fixing portion 34 to the first guide portion 36A in the first axial direction D11. The first axial direction D11 is parallel to the axial direction D1. The first connection portion 38A extends radially outward from the fixing portion 34 to the first guide portion 36A. The first guide portion 36A extends from the first connection portion 38A in the first axial direction D11.

[0111] The second connection portion 38B extends from the fixing portion 34 to the second guide portion 36B in the axial direction D1. The second connection portion 38B extends from the fixing portion 34 to the second guide portion 36B in the first axial direction D11. The second connection portion 38B extends radially outward from the fixing portion 34 to the second guide portion 36B. The second guide portion 36B extends from the second connection portion 38B in the first axial direction D11.

[0112] The third connection portion 38C extends from the fixing portion 34 to the third guide portion 36C in the axial direction D1. The third connection portion 38C extends from the fixing portion 34 to the third guide portion 36C in the first axial direction D11. The third connection portion 38C extends radially outward from the fixing portion 34 to the third guide portion 36C. The third guide portion 36C extends from the third connection portion 38C in the first axial direction D11.

[0113] The fixing portion 34 has a first axial length L11, a first radial length L12 and a first circumferential length L13 relative to the rotation center axis A1. The first axial length L11 is defined in the axial direction D1. The first radial length L12 is defined in the radial direction. The first circumferential length L13 is defined in the circumferential direction D2.

[0114] In the present embodiment, the first circumferential length L13 is greater than the first axial length L11 and the first radial length L12. The first axial length L11 is greater than the first radial length L12. However, if necessary and / or desired, the first circumferential length L13 may be less than or equal to at least one of the first axial length L11 and the first radial length L12. If necessary and / or desired, the first axial length L11 may be less than or equal to the first radial length L12.

[0115] At least one guide portion 36 has a second axial length L21, a second radial length L22, and a second circumferential length L23 relative to the rotation center axis A1. The second axial length L21 is defined in the axial direction D1. The second radial length L22 is defined in the radial direction. The second circumferential length L23 is defined in the circumferential direction D2.

[0116] In the present embodiment, the second circumferential length L23 is greater than the second axial length L21 and the second radial length L22. The second axial length L21 is greater than the second radial length L22. The second axial length L21 is equal to or greater than 2 mm. In the present embodiment, the second axial length L21 is 3 mm. However, the second axial length L21 is not limited to the above range and length. If necessary and / or desired, the second circumferential length L23 may be less than or equal to at least one of the second axial length L21 and the second radial length L22. If necessary and / or desired, the second axial length L21 may be less than or equal to the second radial length L22.

[0117] The tooth position retaining member 32 includes at least one protrusion 40. The at least one protrusion 40 is configured to position the tooth position retaining member 32 relative to the first sprocket SP1 when the tooth position retaining member 32 is attached to the first sprocket SP1. The at least one protrusion 40 is configured to restrict relative rotation between the tooth position retaining member 32 and the first sprocket SP1 in the circumferential direction D2 in a state where the tooth position retaining member 32 is fixed to the first sprocket SP1. The at least one protrusion 40 includes a plurality of protrusions 40. The plurality of protrusions 40 include a first protrusion 40A, a second protrusion 40B, and a third protrusion 40C.

[0118] The first protrusion 40A is disposed in a circumferential position corresponding to the circumferential position of the first guide portion 36A. The first protrusion 40A protrudes from the fixing portion 34 along the axial direction D1. The first protrusion 40A protrudes from the fixing portion 34 along a second axial direction D12, which is the opposite direction of the first axial direction D11. The second axial direction D12 is parallel to the first axial direction D11. If necessary and / or desired, the first protrusion 40A can be offset from the first guide portion 36A in the circumferential direction D2. If necessary and / or desired, the first protrusion 40A can be omitted from the tooth position retaining member 32.

[0119] The second protrusion 40B is disposed in a circumferential position corresponding to the circumferential position of the second guide portion 36B. The second protrusion 40B protrudes from the fixing portion 34 in the axial direction D1. The second protrusion 40B protrudes from the fixing portion 34 in the second axial direction D12. If necessary and / or desired, the second protrusion 40B may be offset from the second guide portion 36B in the circumferential direction D2. If necessary and / or desired, the second protrusion 40B may be omitted from the tooth position retaining member 32.

[0120] The third protrusion 40C is disposed in a circumferential position corresponding to the circumferential position of the third guide portion 36C. The third protrusion 40C protrudes from the fixing portion 34 in the axial direction D1. The third protrusion 40C protrudes from the fixing portion 34 in the second axial direction D12. If necessary and / or desired, the third protrusion 40C may be offset from the third guide portion 36C in the circumferential direction D2. If necessary and / or desired, the third protrusion 40C may be omitted from the tooth position holding member 32.

[0121] like Fig. 9 and Fig.10 As shown, the first sprocket SP1 includes at least one positioning recess 41. The at least one positioning recess 41 includes a plurality of positioning recesses 41. The plurality of positioning recesses 41 include a first positioning recess 41A, a second positioning recess 41B, and a third positioning recess 41C. The first protrusion 40A is configured to be disposed in the first positioning recess 41A in a state where the tooth position retaining member 32 is fixed to the first sprocket SP1. The second protrusion 40B is configured to be disposed in the second positioning recess 41B in a state where the tooth position retaining member 32 is fixed to the first sprocket SP1. The third protrusion 40C is configured to be disposed in the third positioning recess 41C in a state where the tooth position retaining member 32 is fixed to the first sprocket SP1.

[0122] like Fig.13 As shown, the first guide portion 36A, the second guide portion 36B and the third guide portion 36C form an isosceles triangle when viewed from the axial direction D1. If needed and / or desired, the first guide portion 36A, the second guide portion 36B and the third guide portion 36C may be circumferentially arranged at constant or different intervals.

[0123] The first circumferential center plane 36A1 is defined to bisect the first circumferential length L12 of the first guide portion 36A when viewed along the rotational center axis A1. The first circumferential center plane 36A1 extends radially outward from the rotational center axis A1 to bisect the first circumferential length L12 when viewed along the rotational center axis A1.

[0124] The second circumferential center plane 36B1 is defined to bisect the second circumferential length L22 of the second guide portion 36B when viewed along the rotational center axis A1. The second circumferential center plane 36B1 extends radially outward from the rotational center axis A1 to bisect the second circumferential length L22 when viewed along the rotational center axis A1.

[0125] The third circumferential center plane 36C1 is defined to bisect the third circumferential length L32 of the third guide portion 36C when viewed along the rotational center axis A1. The third circumferential center plane 36C1 extends radially outward from the rotational center axis A1 to bisect the third circumferential length L32 when viewed along the rotational center axis A1.

[0126] The first circumferential angle AG1 is defined between the first circumferential center plane 36A1 and the second circumferential center plane 36B1 along the circumferential direction D2. The second circumferential angle AG2 is defined between the second circumferential center plane 36B1 and the third circumferential center plane 36C1 along the circumferential direction D2. The third circumferential angle AG3 is defined between the first circumferential center plane 36A1 and the third circumferential center plane 36C1 along the circumferential direction D2.

[0127] The first circumferential angle AG1 is equal to the third circumferential angle AG3. The second circumferential angle AG2 is different from the first circumferential angle AG1 and the third circumferential angle AG3. The second circumferential angle AG2 is less than the first circumferential angle AG1 and the third circumferential angle AG3. However, if needed and / or desired, the second circumferential angle AG2 can be greater than or equal to at least one of the first circumferential angle AG1 and the third circumferential angle AG3. If needed and / or desired, the first circumferential angle AG1 can be different from the third circumferential angle AG3.

[0128] The second circumferential angle AG2 is different from the first circumferential angle AG1 and the third circumferential angle AG3. Therefore, in a state where the tooth position holding member 32 is fixed to the first sprocket SP1, and in a state where the second sprocket SP2 is engaged with the first guide portion 36A, the second guide portion 36B, and the third guide portion 36C, the first guide portion 36A, the second guide portion 36B, and the third guide portion 36C define a single circumferential position of the second sprocket SP2 relative to the first sprocket SP1.

[0129] The second sprocket body SPB21 of the second sprocket SP2 has at least one circumferential abutment surface 42. The at least one circumferential abutment surface 42 is configured to abut at least one guide portion 36 to maintain relative positions between the plurality of first sprocket teeth SPT12 and the plurality of second sprocket teeth SPT22 in the circumferential direction D2.

[0130] The second sprocket body SPB21 has a plurality of first circumferential abutment surfaces 42A configured to abut against the first guide portion 36A to maintain the relative position in the circumferential direction D2 between the plurality of first sprocket teeth SPT12 and the plurality of second sprocket teeth SPT22. In the mounted state, the first guide portion 36A is disposed between the first circumferential abutment surfaces 42A in the circumferential direction D2. The first circumferential abutment surfaces 42A define the first guide groove 37A.

[0131] The second sprocket body SPB21 has a plurality of second circumferential abutment surfaces 42B configured to abut against the second guide portion 36B to maintain the relative position in the circumferential direction D2 between the plurality of first sprocket teeth SPT12 and the plurality of second sprocket teeth SPT22. In the mounted state, the second guide portion 36B is disposed between the second circumferential abutment surfaces 42B in the circumferential direction D2. The second circumferential abutment surfaces 42B define the second guide groove 37B.

[0132] The second sprocket body SPB21 has a plurality of third circumferential abutment surfaces 42C configured to abut against the third guide portion 36C to maintain the relative position in the circumferential direction D2 between the plurality of first sprocket teeth SPT12 and the plurality of second sprocket teeth SPT22. In the mounted state, the third guide portion 36C is disposed between the third circumferential abutment surfaces 42C in the circumferential direction D2. The third circumferential abutment surfaces 42C define the third guide groove 37C.

[0133] like Fig.14 As shown, the first locking member 28 includes a first axial end 28A and a second axial end 28B. The second axial end 28B is opposite to the first axial end 28A in the axial direction D1 relative to the rotation center axis A1 of the plurality of rear sprockets SP. The first axial end 28A is configured to be detachably attached to the sprocket support body 18 of the rear hub assembly 12 in a mounted state where the plurality of rear sprockets SP are mounted to the rear hub assembly 12.

[0134] The first axial end 28A has a first external thread 28D. The second axial end 28B has a first internal thread 28E. The axially inward end 26A has a first external thread 28D. The first external thread 28D may also be referred to as the first thread 28D. The first internal thread 28E may also be referred to as the second thread 28E. Therefore, the first axial end 28A has a first thread 28D. The second axial end 28B has a second thread 28E. The axially inward end 26A has a first thread 28D.

[0135] The first locking member 28 includes a first surface 28C. The first surface 28C faces radially outward relative to the rotation center axis A1 in the radial direction. The first surface 28C is adjacent to the first external thread 28D. The first surface 28C extends from the first external thread 28D in the axial direction D1. The first internal thread 28E is arranged radially inside the first surface 28C. The first surface 28C is adjacent to the first thread 28D. The first thread 28D of the first locking member 28 extends outward from the first surface 28C in the radial direction.

[0136] The first external thread 28D of the first locking member 28 extends radially outward from the first surface 28C in the radial direction. The first external thread 28D of the first locking member 28 is configured to engage with the internal thread 18D of the sprocket support body 18 provided to the rear hub assembly 12 in the installed state. The internal thread 18D is provided on the axial end 18B of the sprocket support body 18. The internal thread 18D may also be referred to as the thread 18D. Therefore, the first thread 28D is configured to threadably engage with the thread 18D of the sprocket support body 18 provided to the rear hub assembly 12 in the installed state in which the rear sprocket assembly 10 is installed to the rear hub assembly 12.

[0137] The second locking member 30 includes a third axial end 30A and a fourth axial end 30B. The fourth axial end 30B is opposite to the third axial end 30A in the axial direction D1. The third axial end 30A is configured to be attached to the second axial end 28B of the first locking member 28 in an assembled state where the first sprocket SP1 and the locking device 26 are assembled into one unit. The third axial end 30A is configured to be attached to the second axial end 28B of the first locking member 28 in an assembled state where the smallest sprocket SP1 and the locking device 26 are assembled into one unit. The third axial end 30A is configured to be attached to the second axial end 28B of the first locking member 28 in an assembled state where the locking device 26, the first sprocket SP1, and the second sprocket SP2 are assembled into one unit. The third axial end 30A of the second locking member 30 is configured to be detachably attached to the second axial end 28B of the first locking member 28 in an assembled state where the first or smallest sprocket SP1 and the locking device 26 are assembled into one unit. The third axial end portion 30A of the second locking member 30 is configured to be detachably attached to the second axial end portion 28B of the first locking member 28 in an assembled state in which the locking device 26 , the first sprocket SP1 , and the second sprocket SP2 are assembled into one unit.

[0138] The third axial end 30A has a second external thread 30D. The fourth axial end 30B has at least one radial protrusion 30F. That is, the axially outward end 26B has at least one radial protrusion 30F. The second external thread 30D can also be referred to as the third thread 30D. Therefore, the third axial end 30A has a third thread 30D.

[0139] The second locking member 30 includes a second surface 30C. The second surface 30C faces radially outward in the radial direction. The second surface 30C is adjacent to the second external thread 30D and the at least one radial protrusion 30F. The second surface 30C is adjacent to the third thread 30D. The second surface 30C is adjacent to the at least one radial protrusion 30F in the axial direction D1. The second surface 30C is disposed between the third thread 30D and the at least one radial protrusion 30F. The first surface 28C of the first locking member 28 is disposed radially outward from the second surface 30C of the second locking member 30 relative to the rotation center axis A1 in the radial direction in an assembled state in which the first sprocket SP1 and the locking device 26 are assembled into one unit. The first radial minimum portion SP19 of the first sprocket SP1 is disposed radially outside the second surface 30C in an assembled state in which the first sprocket SP1 and the locking device 26 are assembled into one unit.

[0140] The first internal thread 28E of the first locking member 28 is configured to engage with the second external thread 30D of the second locking member 30. In other words, the third thread 30D is configured to threadably engage with the second thread 28E of the first locking member 28 in an assembled state where the first sprocket SP1 and the locking device 26 are assembled into one unit. At least one radial protrusion 30F of the second locking member 30 extends radially outward from the second surface 30C in the radial direction.

[0141] At least one radial protrusion 30F of the second locking member 30 is configured to abut against the smallest sprocket SP1 among the plurality of rear sprockets SP in the axial direction D1 when the plurality of rear sprockets SP are mounted to the rear hub assembly 12. At least one radial protrusion 30F of the second locking member 30 is configured to abut against the smallest sprocket SP1 among the plurality of rear sprockets SP in the axial direction D1 when the plurality of rear sprockets SP and the locking device 26 are mounted to the rear hub assembly 12. That is, at least one radial protrusion 30F of the second locking member 30 is configured to abut against the first sprocket SP1 in the axial direction D1 when the rear sprocket assembly 10 is mounted to the rear hub assembly 12. At least one radial protrusion 30F has a flange shape. However, if necessary and / or desired, the at least one radial protrusion 30F may include a plurality of radial protrusions. If necessary and / or desired, the at least one radial protrusion 30F may have a shape different from the flange shape.

[0142] like Figure 8 As shown, the first axial end 28A of the first locking member 28 includes a first tool engagement profile 28G. In the present embodiment, the first tool engagement profile 28G includes a plurality of first tool engagement recesses 28G1. The first tool engagement recesses 28G1 are arranged circumferentially at constant intervals. However, the structure of the first tool engagement profile 28G is not limited to the first tool engagement recesses 28G1.

[0143] like Figure 7 As shown, the fourth axial end 30B of the second locking member 30 includes a second tool engagement profile 30G. In the present embodiment, at least one radial protrusion 30F includes a second tool engagement profile 30G. The second tool engagement profile 30G includes a plurality of second tool engagement recesses 30G1. The second tool engagement recesses 30G1 are arranged circumferentially at constant intervals. However, the structure of the second tool engagement profile 30G is not limited to the second tool engagement recesses 30G1.

[0144] The first tool engagement profile 28G is configured to engage with the first tool. The second tool engagement profile 30G is configured to engage with the second tool. In a state where the first tool is engaged with the first tool engagement profile 28G and the second tool is engaged with the second tool engagement profile 30G, the first locking member 28 and the second locking member 30 are rotated relative to each other by using the first tool and the second tool. Therefore, the second external thread 30D of the second locking member 30 is screwed into the first internal thread 28E of the first locking member 28.

[0145] like Fig.14 As shown, the locking device 26 is configured to dispose the first sprocket SP1 in the axial direction D1 between the first thread 28D of the first locking member 28 and the at least one radial protrusion 30F of the second locking member 30 when the first sprocket SP1 and the locking device 26 are assembled into one unit. The locking device 26 is configured to dispose the first sprocket SP1 and the second sprocket SP2 in the axial direction D1 between the first external thread 28D of the first locking member 28 and the at least one radial protrusion 30F of the second locking member 30 when the locking device 26, the first sprocket SP1 and the second sprocket SP2 are assembled into one unit.

[0146] The first sprocket SP1 and the second sprocket SP2 are configured to be disposed in the axial direction D1 between at least one radial protrusion 30F of the second locking member 30 and the sprocket support body 18 of the rear hub assembly 12 in the installed state. The first locking member 28 and the second locking member 30 are configured to dispose at least two sprockets of the plurality of rear sprockets SP between the first external thread 28D of the first locking member 28 and at least one radial protrusion 30F of the second locking member 30 in the axial direction D1 in the assembled state in which the first locking member 28, the second locking member 30 and at least two sprockets of the plurality of rear sprockets SP are assembled into one unit.

[0147] At least two of the plurality of rear sprockets SP include a smallest sprocket SP1 and a largest sprocket of the at least two sprockets. In the present embodiment, the first locking member 28 and the second locking member 30 are configured to arrange the first sprocket SP1 and the second sprocket SP2 between the first external thread 28D of the first locking member 28 and at least one radial protrusion 30F of the second locking member 30 along the axial direction D1 when the first locking member 28, the second locking member 30, the first sprocket SP1 and the second sprocket SP2 are assembled into one unit. Therefore, the at least two sprockets include the first sprocket SP1 and the second sprocket SP2. The first sprocket SP1 may also be referred to as the smallest sprocket SP1 of the at least two sprockets. The second sprocket SP2 may also be referred to as the largest sprocket SP2 of the at least two sprockets. However, if necessary and / or desired, at least two of the plurality of rear sprockets SP may include other sprockets of the plurality of rear sprockets SP.

[0148] The first sprocket opening SPO13 may also be referred to as the smallest sprocket opening SPO13. The first diameter DM11 of the first sprocket opening SPO13 may also be referred to as the smallest sprocket diameter DM11. Therefore, the smallest sprocket SP1 includes the smallest sprocket opening SPO13 having the smallest sprocket diameter DM11.

[0149] The second sprocket opening SPO23 may also be referred to as a maximum sprocket opening SPO23. The second diameter DM21 of the second sprocket opening SPO23 may also be referred to as a maximum sprocket diameter DM21. The largest sprocket SP2 includes a maximum sprocket opening SPO23 having a maximum sprocket diameter DM21.

[0150] At least one radial protrusion 30F has a radial outer diameter DM4. The first external thread 28D has a major diameter DM5. The radial outer diameter DM4 of at least one radial protrusion 30F can also be referred to as a radial maximum protrusion diameter DM4. The major diameter DM5 of the first external thread 28D can also be referred to as a first radial maximum thread diameter DM5. Therefore, at least one radial protrusion 30F has a radial maximum protrusion diameter DM4. The first thread 28D has a first radial maximum thread diameter DM5.

[0151] The radial outer diameter DM4 of the at least one radial protrusion 30F is larger than the first diameter DM11 of the first sprocket opening SPO13. The major diameter DM5 of the first external thread 28D is larger than the second diameter DM21 of the second sprocket opening SPO23. That is, the radial outer diameter DM4 of the at least one radial protrusion 30F is larger than the minimum sprocket diameter DM11. The major diameter DM5 of the first external thread 28D is larger than the maximum sprocket diameter DM21. The first radial minimum diameter DM11 of the first sprocket opening SPO13 is smaller than each of the first radial maximum thread diameter DM5 of the first thread 28D and the radial maximum protrusion diameter DM4 of the at least one radial protrusion 30F.

[0152] The first locking member 28 has an axial contact surface 28F disposed radially inward from the first surface 28C. The axial contact surface 28F is configured to contact the third axial end 30A of the second locking member 30 in an assembled state in which the first sprocket SP1 and the locking device 26 are assembled into one unit. The axial contact surface 28F is configured to contact the third axial end 30A of the second locking member 30 in an assembled state in which the locking device 26, the first sprocket SP1, and the second sprocket SP2 are assembled into one unit. The axial contact surface 28F is configured to contact the third axial end 30A of the second locking member 30 in an assembled state in which the first locking member 28, the second locking member 30, and at least two sprockets of the plurality of rear sprockets are assembled into one unit. The axial contact surface 28F is configured to contact the third axial end 30A of the second locking member 30 in an assembled state in which the first locking member 28, the second locking member 30, the first sprocket SP1, and the second sprocket SP2 are assembled into one unit.

[0153] The first sprocket SP1 has a first axially outward surface SP14 and a first axially inward surface SP15. The first axially outward surface SP14 and the first axially inward surface SP15 face opposite directions to each other in the axial direction D1. The first axially inward surface SP15 is configured to face the axial center plane CP of the human-powered vehicle 2 in the mounted state of the rear sprocket assembly 10 mounted to the rear hub assembly 12.

[0154] The second sprocket SP2 has a second axially outward surface SP24 and a second axially inward surface SP25. The second axially outward surface SP24 and the second axially inward surface SP25 face opposite directions to each other in the axial direction D1. The second axially inward surface SP25 is configured to face the axial center plane CP of the human-powered vehicle 2 in the installed state.

[0155] like Fig. 9 and Fig.10 As shown, the first sprocket SP1 includes a first axially inward torque transmission profile SP16 provided to the first axially inward surface SP15. The second sprocket SP2 includes a second axially outward torque transmission profile SP26 provided to the second axially outward surface SP24. The first axially inward torque transmission profile SP16 is configured to engage with the second axially outward torque transmission profile SP26 in a torque transmitting manner. The first axially inward torque transmission profile SP16 is configured to engage with the second axially outward torque transmission profile SP26 of the second sprocket SP2 adjacent to the first sprocket SP1 in a torque transmitting manner when the rear sprocket assembly 10 is mounted to the rear hub assembly 12, and in the axial direction D1, there is no other sprocket between the first sprocket SP1 and the second sprocket SP2.

[0156] like Fig. 9As shown, the first axial inward torque transmission profile SP16 includes a plurality of first teeth SP16A. The plurality of first teeth SP16A include a plurality of first teeth SP16A1 and one first tooth SP16A2. The first tooth SP16A2 has a shape and / or size different from that of the plurality of first teeth SP16A1. In the present embodiment, the circumferential width of the first tooth SP16A2 is greater than the circumferential width of the first tooth SP16A1.

[0157] like Fig.10 As shown, the second axial outward torque transmission profile SP26 includes a plurality of second recesses SP26A. The plurality of second recesses SP26A include a plurality of second recesses SP26A1 and one second recess SP26A2. The second recess SP26A2 has a shape and / or size different from that of the plurality of second recesses SP26A1. In the present embodiment, the circumferential width of the second recess SP26A2 is greater than the circumferential width of the second recess SP26A1.

[0158] like Fig. 9 and Fig.10 As shown, the first teeth SP16A of the first sprocket SP1 are configured to respectively mesh with the second recessed portions SP26A of the second sprocket SP2 in a torque-transmitting manner. In the present embodiment, the first teeth SP16A1 of the first sprocket SP1 are configured to respectively mesh with the second recessed portions SP26A1 of the second sprocket SP2. The first teeth SP16A2 of the first sprocket SP1 are configured to mesh with the second recessed portions SP26A2 of the second sprocket SP2. Since the circumferential width of the first teeth SP16A2 is greater than the circumferential width of the second recessed portions SP26A1, the first teeth SP16A2 are configured not to mesh with the second recessed portions SP26A1. Therefore, the first teeth SP16A2 and the second recessed portions SP26A2 define a single circumferential position of the first sprocket SP1 relative to the second sprocket SP2.

[0159] like Fig. 9 and Fig.15 As shown, the second sprocket SP2 includes a second axially inward torque transmission profile SP27 provided to the second axially inward surface SP25. The second axially inward torque transmission profile SP27 is configured to engage with one of the torque transmission profile provided to the third sprocket SP3 and the torque transmission profile provided to the sprocket support body 18 of the rear hub assembly 12 in a torque transmitting manner.

[0160] In this embodiment, if Fig.15 As shown, the second axially inward torque transmission profile SP27 is configured to engage in a torque transmission manner with a torque transmission profile SP37 provided to the third sprocket SP3. However, if needed and / or desired, the second axially inward torque transmission profile SP27 can be configured to engage in a torque transmission manner with a torque transmission profile provided to the sprocket support body 18.

[0161] like Fig. 9 As shown, the second axial inward torque transmission profile SP27 includes a plurality of second additional teeth SP27A. The plurality of second additional teeth SP27A include a plurality of second additional teeth SP27A1 and a second additional tooth SP27A2. The second additional tooth SP27A2 has a shape and / or size different from another one of the plurality of second additional teeth SP27A1. In the present embodiment, the circumferential width of the second additional tooth SP27A2 is greater than the circumferential width of the second additional tooth SP27A1.

[0162] like Fig.15 As shown, the torque transmission profile SP37 includes a plurality of third recesses SP37A. The plurality of third recesses SP37A include a plurality of third recesses SP37A1 and one third recess SP37A2. The third recess SP37A2 has a shape and / or size different from that of the plurality of third recesses SP37A1. In the present embodiment, the circumferential width of the third recess SP37A2 is greater than the circumferential width of the third recess SP37A1.

[0163] like Fig. 9 and Fig.15 As shown, the second additional teeth SP27A of the second sprocket SP2 are configured to mesh with the third recessed portions SP37A of the third sprocket SP3, respectively. In the present embodiment, the second additional teeth SP27A1 of the second sprocket SP2 are configured to mesh with the third recessed portions SP37A1 of the third sprocket SP3, respectively. The second additional teeth SP27A2 of the second sprocket SP2 are configured to mesh with the third recessed portions SP37A2 of the third sprocket SP3. Since the circumferential width of the second additional teeth SP27A2 is greater than the circumferential width of the third recessed portions SP37A1, the second additional teeth SP27A2 are configured not to mesh with the third recessed portions SP37A1. Therefore, the second additional teeth SP27A2 and the third recessed portions SP37A2 define the rotational position of the second sprocket SP2 relative to the third sprocket SP3.

[0164] like Figure 6 and Fig.15 As shown, the third sprocket SP3 includes an additional torque transmission profile SP38. In the present embodiment, the additional torque transmission profile SP38 is configured to engage with the plurality of external spline teeth 18A of the sprocket support body 18 in a torque transmission manner. The additional torque transmission profile SP38 and the plurality of external spline teeth 18A define a single circumferential position of the third sprocket SP3 relative to the sprocket support body 18. The rotational force is transmitted from the first sprocket SP1 to the sprocket support body 18 via the second sprocket SP2 and the third sprocket SP3. The rotational force is transmitted from the second sprocket SP2 to the sprocket support body 18 via the third sprocket SP3.

[0165] The following will refer to Figures 7 to 10and Figures 16 to 18 An assembling process in which the first sprocket SP1, the second sprocket SP2, the locking device 26, and the tooth position retaining member 32 are assembled to the rear hub assembly 12 will be described.

[0166] like Fig.16 As shown, the first sprocket SP1, the second sprocket SP2, the locking device 26 and the tooth position retaining member 32 are assembled into the locking device assembly 50 before the first sprocket SP1 and the second sprocket SP2 are assembled to the rear hub assembly 12. The locking device assembly 50 includes the first sprocket SP1, the second sprocket SP2, the locking device 26 and the tooth position retaining member 32.

[0167] The locking device 26 is configured such that the first sprocket SP1 is slidable in the axial direction D1 relative to the locking device 26 in the assembled state and before the rear sprocket assembly 10 is mounted to the rear hub assembly 12. The locking device 26 is configured such that the adjacent sprocket SP2 is slidable in the axial direction D1 relative to the locking device 26 in the assembled state and before the plurality of rear sprockets SP are mounted to the rear hub assembly 12 in a space provided radially outside the first surface 28C and the second surface 30C.

[0168] In the present embodiment, the first sprocket SP1 is slidable between the first thread 28D of the first locking member 28 and the at least one radial protrusion 30F of the second locking member 30 in the axial direction D1 in the mounted state when the rear sprocket assembly 10 is mounted to the rear hub assembly 12. The first sprocket SP1 is slidable between the first thread 28D of the first locking member 28 and the at least one radial protrusion 30F of the second locking member 30 in the axial direction D1 in the assembled state before the rear sprocket assembly 10 is mounted to the rear hub assembly 12. However, if needed and / or desired, the locking device 26 may be configured such that the smallest sprocket SP1 is stationary relative to the locking device 26 in the axial direction D1 in the mounted state when the plurality of rear sprockets SP are mounted to the rear hub assembly 12. If needed and / or desired, the locking device 26 may be configured such that the smallest sprocket SP1 is stationary relative to the locking device 26 in the axial direction D1 in the assembled state before the plurality of rear sprockets SP are mounted to the rear hub assembly 12. In such an embodiment, the locking device 26 is configured to restrict axial movement of the smallest sprocket SP1 in the first axial direction D11 and the second axial direction D12 relative to the locking device 26 in an assembled state before the mounting state. The at least one radial protrusion 30F of the second locking member 30 contacts the first sprocket SP1 to restrict axial movement of the first sprocket SP1 and the tooth position retaining member 32 in the second axial direction D12 relative to the locking device 26. The second axial end 28B of the first locking member 28 contacts the tooth position retaining member 32 to restrict axial movement of the first sprocket SP1 and the tooth position retaining member 32 in the first axial direction D11 relative to the locking device 26.

[0169] like Fig. 9 and Fig.10 As shown, for example, the fixing portion 34 of the tooth position holding member 32 is inserted into the first sprocket opening SP013 of the first sprocket SP1. At this time, the first protrusion 40A, the second protrusion 40B, and the third protrusion 40C are inserted into the first positioning recess 41A, the second positioning recess 41B, and the third positioning recess 41C. Therefore, the tooth position holding member 32 is fixed to the first sprocket SP1 at a single circumferential position.

[0170] The first, second and third guide portions 36A, 36B and 36C are inserted into the first, second and third guide grooves 37A, 37B and 37C of the second sprocket SP2. Therefore, the second sprocket SP2 is assembled to the first sprocket SP1 via the tooth position retaining member 32 at a single circumferential position relative to the first sprocket SP1.

[0171] like Fig.16As shown, the third axial end 30A of the second locking member 30 is inserted into the first sprocket opening SP013, the opening 34A of the tooth position retaining member 32, and the second sprocket opening SP023. The second external thread 30D of the second locking member 30 is screwed into the first internal thread 28E of the first locking member 28. The first and second locking members 28 and 30 are rotated relative to each other using the first and second tools until the third axial end 30A contacts the axial contact surface 28F of the first locking member 28. Thus, the first sprocket SP1, the second sprocket SP2, the locking device 26, and the tooth position retaining member 32 are assembled into the locking device assembly 50.

[0172] like Fig.17 As shown, when the locking device assembly 50 is assembled to the sprocket support body 18 , the first axial end portion 28A of the first locking member 28 contacts the axial end 18B of the sprocket support body 18 .

[0173] like Fig.18 As shown, the second sprocket SP2 moves toward the third sprocket SP3 to engage the second axially inward torque transmission profile SP27 with the torque transmission profile SP37 of the third sprocket SP3. The second sprocket SP2 rotates relative to the sprocket support body 18 about the rotation center axis A1 to adjust the rotation position of the second axially inward torque transmission profile SP27 relative to the torque transmission profile SP37 of the third sprocket SP3, specifically, to engage the second additional tooth SP27A2 of the second sprocket SP2 with the third recess SP37A2 of the third sprocket SP3. Since the tooth position retaining member 32 is configured to couple the first sprocket SP1 and the second sprocket SP2 so that the second sprocket SP2 is slidable in the axial direction D1 relative to the first sprocket SP1, the first sprocket SP1 and the tooth position retaining member 32 rotate relative to the sprocket support body 18 about the rotation center axis A1 together with the second sprocket SP2 in response to the rotation of the second sprocket SP2. Therefore, the first sprocket SP1, the second sprocket SP2, and the third sprocket SP3 are positioned at predetermined rotational positions relative to each other in a state in which the second axially inward torque transmission profile SP27 is engaged with the torque transmission profile SP37 of the third sprocket SP3.

[0174] like Fig.14 and Fig.17As shown, the locking device 26 is rotated relative to the sprocket support body 18 about the rotation center axis A1 using the second tool so that the first external thread 28D of the first locking member 28 is screwed into the internal thread 18D of the sprocket support body 18. When the locking device 26 is rotated relative to the sprocket support body 18, the rotational position between the second sprocket SP2 and the third sprocket SP3 remains unchanged relative to the sprocket support body 18 because the second axially inward torque transmission profile SP27 of the second sprocket SP2 is engaged with the torque transmission profile SP37 of the third sprocket SP3. When the locking device 26 is rotated relative to the sprocket support body 18, the rotational position between the first sprocket SP1 and the second sprocket SP2 remains unchanged relative to the sprocket support body 18 because the guide portion 36 of the tooth position retaining member 32 is engaged with the guide groove 37 of the second sprocket SP2. Therefore, when the locking device 26 is tightened using the second tool, the first axially inward torque transmission profile SP16 is smoothly engaged with the second axially outward torque transmission profile SP26. When the locking device 26 is tightened using a tool, the first and second sprockets SP1 and SP2 are held between the radial protrusions 30F and the third sprocket SP3 in the axial direction D1. Thus, the first and second sprockets SP1 and SP2 are mounted to the sprocket support body 18 of the rear hub assembly 12 using the locking device 26 and the tooth position retaining member 32.

[0175] The structures of the first sprocket SP1, the second sprocket SP2 and the tooth position retaining member 32 can be applied to other rear sprocket assemblies. For example, the structures of the first sprocket SP1, the second sprocket SP2 and the tooth position retaining member 32 can be applied to Figures 19 to 21 Rear sprocket assemblies 210 , 310 , and 410 are shown. Figures 19 to 21 The rear sprocket assemblies 210, 310 and 410 shown have substantially the same structure as the rear sprocket assembly 10. The sprocket carrier 22 of the present embodiment is omitted in the rear sprocket assemblies 210, 310 and 410.

[0176] like Fig.19 As shown, the sprockets SP of the rear sprocket assembly 210 include the first sprocket SP201 to the eleventh sprocket SP211. The seventh sprocket SP207 to the ninth sprocket SP209 are fixed to each other by fasteners 225. The rear sprocket assembly 210 includes a spacer SS21 and a spacer SS22. The spacer SS21 is arranged between the seventh sprocket SP207 and the eighth sprocket SP208. The spacer SS22 is arranged between the eighth sprocket SP208 and the ninth sprocket SP209. The seventh sprocket SP207 to the ninth sprocket SP209 and the spacers SS21 and SS22 are fixed to each other by fasteners 225.

[0177] The spacer SS21 includes a ring SS21A and a plurality of arms SS21B extending radially outward from the ring SS21A. The arms SS21B are arranged circumferentially. The spacer SS22 includes a ring SS22A and a plurality of arms SS22B extending radially outward from the ring SS22A. The arms SS22B are arranged circumferentially. The seventh sprocket SP207 to the ninth sprocket SP209 and the arms SS21B and the arms SS22B are fixed to each other by fasteners 225.

[0178] The eighth sprocket SP208 to the tenth sprocket SP210 are fixed to each other by the fastener 227. The spacer SS22 is provided between the eighth sprocket SP208 and the ninth sprocket SP209. The eighth sprocket SP208 to the tenth sprocket SP210 and the arm SS22B are fixed to each other by the fastener 227. Each fastener 227 includes a spacer 227A. The spacer 227A of the fastener 227 is provided between the ninth sprocket SP209 and the tenth sprocket SP210.

[0179] The ninth sprocket SP209 and the tenth sprocket SP210 are fixed to each other by the fastener 229. Each fastener 229 includes a spacer 229A. The spacer 229A of the fastener 229 is provided between the ninth sprocket SP209 and the tenth sprocket SP210.

[0180] The tenth sprocket SP210 and the eleventh sprocket SP211 are fixed to each other by fasteners 231. Each fastener 231 includes a spacer 231A. The spacer 231A of the fastener 231 is disposed between the tenth sprocket SP210 and the eleventh sprocket SP211. Therefore, the seventh sprocket SP207 to the eleventh sprocket 211 are integrally connected with the fasteners 225, 227, 229 and 231.

[0181] like Fig. 20 As shown, the rear sprocket assembly 310 has a structure substantially the same as that of the rear sprocket assembly 210. The sprockets SP of the rear sprocket assembly 310 include first to eighth sprockets SP201 to SP208 and ninth to eleventh sprockets SP309 to SP311. The sprockets SP309 to SP311 have structures substantially the same as those of the sprockets SP209 to SP211.

[0182] The seventh sprocket SP207, the eighth sprocket SP208, and the ninth sprocket SP309 are fixed to each other by the fastener 225. The spacer SS21 is provided between the seventh sprocket SP207 and the eighth sprocket SP208. The spacer SS22 is provided between the eighth sprocket SP208 and the ninth sprocket SP309. The seventh sprocket SP207, the eighth sprocket SP208, and the ninth sprocket SP309 and the spacers SS21 and SS22 are fixed to each other by the fastener 225. The seventh sprocket SP207, the eighth sprocket SP208, and the ninth sprocket SP309 and the arms SS21B and SS22B are fixed to each other by the fastener 225.

[0183] The eighth sprocket SP208 and the ninth sprocket SP309 are fixed to each other by the fastener 327. The spacer SS22 is provided between the eighth sprocket SP208 and the ninth sprocket SP309. The eighth sprocket SP208 and the ninth sprocket SP309 and the arm SS22B are fixed to each other by the fastener 327.

[0184] The ninth sprocket SP309 and the tenth sprocket SP310 are fixed to each other by the fastener 229. A spacer 229A of the fastener 229 is provided between the ninth sprocket SP309 and the tenth sprocket SP310.

[0185] The tenth sprocket SP310 and the eleventh sprocket SP311 are fixed to each other by the fastener 231. The spacer 231A of the fastener 231 is disposed between the tenth sprocket SP310 and the eleventh sprocket SP311. Therefore, the seventh sprocket SP207 to the eleventh sprocket SP311 are integrally coupled with the fasteners 225, 327, 229 and 231.

[0186] like Fig.21 As shown, the sprocket SP311 and the fastener 231 of the rear sprocket assembly 310 are omitted in the rear sprocket assembly 410. The seventh sprocket SP207 to the tenth sprocket SP310 are integrally coupled with the fasteners 225, 327 and 229.

[0187] exist Figures 6 to 8 In the above described embodiment, the rear sprocket assembly 10 includes the tooth position retaining member 32. However, as Figure 22 to Figure 25 As shown, the tooth position retaining member 32 may be omitted from the rear sprocket assembly 10 if needed and / or desired.

[0188] like Fig. 22As shown, a rear sprocket assembly 510 according to a modification of an embodiment of the present invention is configured to be mounted to a rear hub assembly 12 for a human-powered vehicle 2. In the rear sprocket assembly 510, a plurality of rear sprockets SP include a first sprocket SP1, a second sprocket SP502, and a fourth sprocket SP4 to a thirteenth sprocket SP13. That is, the rear sprocket assembly 510 includes a first sprocket SP1. The rear sprocket assembly 510 also includes a second sprocket SP502. The third sprocket SP3 is omitted from the plurality of sprockets SP. The thirteenth sprocket SP13 is added to the plurality of sprockets SP. However, the total number of the plurality of rear sprockets SP is not limited to twelve.

[0189] The second sprocket SP502 has substantially the same structure as that of the third sprocket SP3 of the rear sprocket assembly 10. A second sprocket outer diameter DM502 of the second sprocket SP502 is larger than a first sprocket outer diameter DM1 of the first sprocket SP1.

[0190] The second sprocket SP502 is adjacent to the first sprocket or the smallest sprocket SP1, and in the axial direction D1, there is no other sprocket between the adjacent sprocket and the first sprocket or the smallest sprocket SP1. The second sprocket SP502 may also be referred to as the adjacent sprocket SP502. That is, in the rear sprocket assembly 510, the plurality of rear sprockets SP include the adjacent sprocket SP502. The adjacent sprocket SP502 is adjacent to the smallest sprocket SP1, and in the axial direction D1, there is no other sprocket D1 between the adjacent sprocket SP502 and the smallest sprocket SP1.

[0191] like Fig.23 As shown, the rear sprocket assembly 510 includes a locking device 526. The locking device 526 is configured to fix the rear sprocket assembly 510 to the sprocket support body 18 of the rear hub assembly 12 in a mounted state where the rear sprocket assembly 510 is mounted to the rear hub assembly 12. The locking device 526 is configured to mount the first sprocket SP1 to the rear hub assembly 12.

[0192] The locking device 526 has substantially the same structure as the locking device 26 of the rear sprocket assembly 10. The locking device 526 includes an axially inward end 26A and an axially outward end 26B. The axially outward end 26B is opposite to the axially inward end 26A in the axial direction D1.

[0193] like Fig. 22 As shown, the locking device 526 is configured to be attached to the sprocket support body 18 to hold the sprocket carrier 22 and the first, second, fourth and fifth sprockets SP1, SP502, SP4 and SP5 between the locking device 526 and the positioning surface 18C of the sprocket support body 18 in the axial direction D1.

[0194] like Fig.24As shown, the second sprocket SP502 includes a second sprocket body SPB21, a plurality of second sprocket teeth SPT22, and a second sprocket opening SPO23. The second sprocket SP502 has a second axially outward surface SP24 and a second axially inward surface SP25. The second axially outward surface SP24 and the second axially inward surface SP25 face opposite directions to each other in the axial direction D1. The second axially inward surface SP25 is configured to face the axial center plane CP of the human-powered vehicle 2 in the installed state. The second sprocket SP502 includes a second axially outward torque transmission profile SP26.

[0195] The first axially inward torque transfer profile SP16 is configured to engage with the second axially outward torque transfer profile SP26 of the second sprocket SP502 adjacent to the first sprocket SP1 in a torque-transmitting manner when the rear sprocket assembly 510 is installed to the rear hub assembly 12, and there is no other sprocket between the first sprocket SP1 and the second sprocket SP502 in the axial direction D1.

[0196] The second sprocket SP502 comprises an additional torque transmission profile SP527. The additional torque transmission profile SP527 has substantially the same structure as the additional torque transmission profile SP38 of the third sprocket SP3 of the first embodiment.

[0197] The additional torque transmission profile SP527 is configured to engage in a torque transmitting manner with the plurality of external spline teeth 18A of the sprocket support body 18. The additional torque transmission profile SP527 and the plurality of external spline teeth 18A define a single circumferential position of the second sprocket SP502 relative to the sprocket support body 18. The rotational force is transmitted from the first sprocket SP1 to the sprocket support body 18 via the second sprocket SP502.

[0198] like Fig.23 As shown, a locking device 526 for mounting a plurality of rear sprockets SP to a rear hub assembly 12 of a human-powered vehicle 2 includes a first locking member 528 and a second locking member 530. The first locking member 528 includes an axially inward end 26A. The second locking member 530 includes an axially outward end 26B. The first locking member 528 has a structure that is substantially the same as that of the first locking member 28 of the first embodiment. The second locking member 530 has a structure that is substantially the same as that of the second locking member 30 of the first embodiment.

[0199] The first locking member 528 is configured to be detachably engaged with the sprocket support body 18 of the rear hub assembly 12 in the installed state. The second locking member 530 is configured to be detachably engaged with the first locking member 528 so as to abut with the first sprocket SP1 in the axial direction D1 in the installed state. In this modification, the first locking member 528 is a member separate from the second locking member 530. However, if necessary and / or desired, the first locking member 528 can be integrally provided with the second locking member 530 as an integral, unitary member.

[0200] The first locking member 528 is configured to be detachably engaged with the axial end 18B of the sprocket support body 18 in the installed state. The first locking member 528 is configured to be at least partially disposed in the second sprocket opening SPO23 in the installed state. The second locking member 530 is configured to be at least partially disposed in the first sprocket opening SPO13 and the second sprocket opening SPO23 in the installed state.

[0201] like Fig.23 As shown, the first locking member 528 includes a first axial end 28A and a second axial end 28B. The first locking member 528 includes a first surface 28C. The first axial end 28A has a first thread 28D. The second axial end 28B has a second thread 28E. The axially inward end 26A has a first thread 28D. The first locking member 528 has an axial contact surface 28F.

[0202] The second locking member 530 includes a third axial end 30A and a fourth axial end 30B. The second locking member 530 includes a second surface 30C. The third axial end 30A has a third thread 30D. The fourth axial end 30B has at least one radial protrusion 30F. The axially outward end 26B has at least one radial protrusion 30F.

[0203] The locking device 526 is configured to dispose the first sprocket SP1 between the first thread 28D of the first locking member 528 and the at least one radial protrusion 30F of the second locking member 530 in the axial direction D1 when the first sprocket SP1 and the locking device 526 are assembled into one unit.

[0204] exist Figure 6 In the rear sprocket assembly 10 shown, the major diameter DM5 of the first thread 28D is larger than the second diameter DM21 of the second sprocket opening SP023. However, in the rear sprocket assembly 510, the major diameter DM5 of the first thread 28D is smaller than the second diameter DM21 of the second sprocket opening SP023. Therefore, after the first locking member 528 and the second locking member 530 are assembled into one unit, the first locking member 528 can be inserted into the second sprocket opening SP023 of the second sprocket SP502.

[0205] like Fig.25 As shown, before assembling the first sprocket SP1 to the rear hub assembly 12, the first sprocket SP1 and the locking device 526 are assembled into a locking device assembly 550. The locking device assembly 550 includes the first sprocket SP1 and the locking device 526. If needed and / or desired, the locking device assembly 550 may include the second sprocket SP502.

[0206] The locking device 526 is configured such that the first sprocket SP1 is slidable in the axial direction D1 relative to the locking device 526 in the assembled state and before the rear sprocket assembly 510 is mounted to the rear hub assembly 12. The locking device 526 is configured such that the adjacent sprocket SP502 is slidable in the axial direction D1 relative to the locking device 526 over the first surface 28C and the second surface 30C in the assembled state and before the plurality of rear sprockets SP are mounted to the rear hub assembly 12.

[0207] In this modification, the first sprocket SP1 is slidable between the first thread 28D of the first locking member 528 and the at least one radial protrusion 30F of the second locking member 530 in an assembled state in which the first sprocket SP1 and the locking device 526 are assembled into one unit. The first sprocket SP1 is slidable between the first thread 28D of the first locking member 528 and the at least one radial protrusion 30F of the second locking member 530 in the axial direction D1 in an assembled state before the mounting state in which the rear sprocket assembly 510 is mounted to the rear hub assembly 12. However, if necessary and / or desired, the locking device 526 may be configured such that the smallest sprocket SP1 is stationary relative to the locking device 526 in the axial direction D1 in the assembled state. If necessary and / or desired, the locking device 526 may be configured such that the smallest sprocket SP1 is stationary relative to the locking device 526 in the axial direction D1 in the assembled state before the mounting state. In such an embodiment, the locking device 526 is configured to restrict axial movement of the first sprocket SP1 in the first axial direction D11 and the second axial direction D12 relative to the locking device 526 in an assembled state before the mounting state. The at least one radial protrusion 30F of the second locking member 530 contacts the first sprocket SP1 to restrict axial movement of the first sprocket SP1 in the second axial direction D12 relative to the locking device 526. The second axial end 28B of the first locking member 28 contacts the first sprocket SP1 to restrict axial movement of the first sprocket SP1 in the first axial direction D11 relative to the locking device 526.

[0208] like Fig.24As shown, in order to assemble the first sprocket SP1 and the locking device 526, the third axial end 30A of the second locking member 530 is inserted into the first sprocket opening SP013. The second external thread 30D of the second locking member 530 is screwed into the first internal thread 28E of the first locking member 528. The first locking member 528 and the second locking member 530 are rotated relative to each other by using the first tool and the second tool until the third axial end 30A contacts the axial contact surface 28F of the first locking member 528. Thus, the first sprocket SP1 and the locking device 526 are assembled into the locking device assembly 550.

[0209] like Fig.25 As shown, the additional torque transmission profile SP527 of the second sprocket SP502 is engaged with the plurality of external spline teeth 18A of the sprocket support body 18. In a state where the second sprocket SP502 is attached to the sprocket support body 18, the first axial end 28A of the first locking member 528 is inserted into the second sprocket opening SP023 of the second sprocket SP502. In an assembled state where the first sprocket SP1 and the locking device 526 are assembled into the locking device assembly 550, the first axial end 28A of the first locking member 528 contacts and is threadedly engaged with the axial end 18B of the sprocket support body 18.

[0210] The first sprocket SP1 moves toward the second sprocket SP502 to engage the first axially inward torque transmission profile SP16 with the second axially outward torque transmission profile SP26 of the second sprocket SP502. The first sprocket SP1 rotates relative to the sprocket support body 18 about the rotation center axis A1 to adjust the rotational position of the first axially inward torque transmission profile SP16 relative to the second axially outward torque transmission profile SP26 of the second sprocket SP502 in the circumferential direction D2 relative to the rotation center axis A1.

[0211] The locking device 526 is rotated relative to the sprocket support body 18 about the rotation center axis A1 using the second tool so that the first external thread 28D of the first locking member 528 is screwed into the internal thread 18D of the sprocket support body 18. When the locking device 526 is rotated relative to the sprocket support body 18, the rotational position between the first sprocket SP1 and the second sprocket SP502 remains unchanged relative to the sprocket support body 18 because the first axially inward torque transmission profile SP16 of the first sprocket SP1 is engaged with the second axially outward torque transmission profile SP26 of the second sprocket SP502. When the locking device 526 is tightened using the tool, the first sprocket SP1 and the second sprocket SP502 are held between the radial protrusion 30F and the third sprocket SP3 in the axial direction D1. Therefore, the first sprocket SP1 and the second sprocket SP502 are mounted to the sprocket support body 18 of the rear hub assembly 12 using the locking device 526.

[0212] If needed and / or desired, the rear sprocket assembly 510 may include the tooth position retaining member 32 of the rear sprocket assembly 10 .

[0213] In the rear sprocket assembly 10 or 510, the third thread 30D is configured to be threadedly engaged with the second thread 28E in the assembled state. However, the third axial end 30A of the second locking member 30 or 530 can be attached to the second axial end 28B of the first locking member 28 or 528 in a press-fit manner by other structures such as spline engagement.

[0214] exist Figure 6 In the rear sprocket assembly 10 shown, the first locking member 28 is a separate member from the second locking member 30. Fig.23 In the rear sprocket assembly 510 shown, the first locking member 528 is a separate member from the second locking member 530. Fig.26 or Fig. 27 As shown, the locking device 26 or 526 can be a one-piece, unitary component.

[0215] exist Fig.26 In the described variation, the first locking member 28 is integrally provided with the second locking member 30 as an integral unitary member. The at least one radial protrusion 30F of the locking device 26 may be formed by material deformation. The at least one radial protrusion 30F of the locking device 26 is formed by material deformation in a state where the first sprocket SP1, the second sprocket SP2, and the tooth position retaining member 32 are arranged radially outside the first surface 28C and the second surface 30C. For example, the at least one radial protrusion 30F of the locking device 26 is formed by press working in a state where the first sprocket SP1, the second sprocket SP2, and the tooth position retaining member 32 are arranged radially outside the first surface 28C and the second surface 30C.

[0216] In such Fig. 27 In the described variation, the first locking member 528 is integrally provided with the second locking member 530 as an integral unitary member. The at least one radial protrusion 30F of the locking device 526 may be formed by material deformation. The at least one radial protrusion 30F of the locking device 526 is formed by material deformation in a state where the first sprocket SP1 is disposed radially outside the first surface 28C and the second surface 30C. For example, the at least one radial protrusion 30F of the locking device 526 is formed by press working in a state where the first sprocket SP1 is disposed radially outside the first surface 28C and the second surface 30C.

[0217] If needed and / or desired, Figures 19 to 21 Each of the structures of the rear sprocket assemblies 210, 310, and 410 shown may be applied to the rear sprocket assemblies 510, Fig.26 Variations of the rear sprocket assembly 10 described and Fig. 27A variation of the rear sprocket assembly 510 is described.

[0218] In this application, the term "comprise" and its derivatives used herein are intended to be open terms, which specify the presence of the features, elements, components, groups, integers and / or steps, but do not exclude the presence of other unspecified features, elements, components, groups, integers and / or steps. This concept also applies to words with similar meanings, for example, the terms "have", "include" and their derivatives.

[0219] The terms “member,” “section,” “portion,” “portion,” “element,” “body,” and “structure” when used in the singular can have the dual meaning of a single part or a plurality of parts.

[0220] Ordinal numbers such as “first” and “second” recorded in the present application are merely identifiers, but do not have any other meanings, for example, a specific order, etc. In addition, for example, the term “first element” itself does not mean the existence of the “second element”, and the term “second element” itself does not mean the existence of the “first element”.

[0221] The term “a pair” used herein may include a configuration in which a pair of elements have the same shape or structure as each other, in addition to a configuration in which a pair of elements have shapes or structures different from each other.

[0222] The terms "a" (or "an"), "one or more" and "at least one" are used interchangeably herein.

[0223] As used in the present disclosure, the phrase “at least one” means “one or more” of the desired options. For example, if the number of its options is two, the phrase “at least one” used in the present disclosure means “only a single option” or “both options”. For another example, if the number of its options is equal to or greater than three, the phrase “at least one” used in the present disclosure means “only a single option” or “any combination of equal to or greater than two options”. For example, the phrase “at least one of A and B” includes (1) A alone, (2) B alone, and (3) A and B. The phrase “at least one of A, B, and C” includes (1) A alone, (2) B alone, (3) C alone, (4) A and B, (5) B and C, (6) A and C, and (7) all of A, B, and C. In other words, the phrase “at least one of A and B” in the present disclosure does not mean “at least one of A and at least one of B”.

[0224] Finally, terms such as "substantially", "about" and "approximately" as used herein refer to a reasonable amount of deviation of the modified term such that the end result is not significantly changed. All numerical values ​​described in this application are to be understood to include terms such as "substantially", "about" and "approximately".

[0225] Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the present invention may be practiced otherwise than as specifically described herein.

Claims

1. A locking device for mounting a plurality of rear sprockets to a rear hub assembly for a human-powered vehicle, the locking device comprising: A first locking member, the first locking member comprising: a first axial end portion configured to be detachably attached to the sprocket support body of the rear hub assembly in an installed state of the plurality of rear sprockets mounted to the rear hub assembly; a second axial end portion, the second axial end portion being opposite to the first axial end portion in an axial direction relative to a rotational center axis of the plurality of rear sprockets; and a first surface facing radially outward in a radial direction relative to the rotational center axis; and A second locking member, the second locking member comprising: a third axial end portion configured to be attached to the second axial end portion of the first locking member in an assembled state in which the smallest sprocket and the locking device are assembled into one unit; a fourth axial end portion, the fourth axial end portion being opposite to the third axial end portion in the axial direction and having at least one radial protrusion; and a second surface, the second surface facing radially outward in the radial direction, the second surface being adjacent to the at least one radial protrusion in the axial direction, The at least one radial protrusion of the second locking member extends radially outward from the second surface in the radial direction and is configured to abut the smallest sprocket of the plurality of rear sprockets in the axial direction in the installed state; The first surface is disposed radially outwardly from the second surface in the radial direction in the assembled state; and The locking device is configured such that the smallest sprocket is slidable in the axial direction relative to the locking device in a space provided radially outside the first surface and the second surface in the assembled state and before the mounted state.

2. The locking device according to claim 1, wherein The plurality of rear sprockets include an adjacent sprocket adjacent to the smallest sprocket, and there is no other sprocket between the adjacent sprocket and the smallest sprocket in the axial direction, The locking device is configured such that the adjacent sprockets are slidable relative to the locking device in the axial direction in the assembled state.

3. The locking device according to claim 1, wherein The first axial end portion has a first thread configured to threadably engage with a thread of the sprocket support body provided to the rear hub assembly in the installed state.

4. The locking device according to claim 1, wherein The third axial end of the second locking member is configured to be detachably attached to the second axial end of the first locking member in the assembled state.

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