Rear sprocket assembly and lock device

Abstract

A 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 is configured to be attached to the second axial end of the first locking member in an assembled state, wherein the first sprocket and the locking device are assembled as a unit. The fourth axial end has at least one radial protrusion configured to abut against the first sprocket in an axial direction in an installed state. The locking device is configured such that, in the assembled state and prior to the installed state, the first sprocket is slidable relative to the locking device in the axial direction.

Description

[Technical Field]

[0001] This invention relates to a rear sprocket assembly and a locking device. [Previous Technology]

[0002] A 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 minimum sprocket. The minimum sprocket preferably has a small number of teeth to provide a wider gear range for a subsequent sprocket assembly. However, the small number of teeth may make it difficult to mount the minimum sprocket to a hub assembly. [Summary of the Invention]

[0003] According to a first aspect of the present invention, a rear sprocket assembly is configured for mounting to a rear wheel 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 relative to a rotational central axis of the rear sprocket assembly. The first sprocket opening is configured to receive a hub axle of the rear wheel hub assembly in an mounted state where the rear sprocket assembly is mounted to the rear wheel hub assembly. The first sprocket opening has a first radial minimum diameter smaller than the outermost diameter of a sprocket support body of the rear wheel hub assembly. The locking device is configured to secure the rear sprocket assembly to the sprocket support body of the rear wheel 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 wheel hub assembly in the installed state. The second axial end is opposite to the first axial end in an 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, wherein the first sprocket and the locking device are assembled as a unit. The fourth axial end is opposite to the third axial end in the axial direction and has at least one radial protrusion configured to abut against the first sprocket in the axial direction in the installed state. The locking device is configured such that, in the assembled state and prior to the installed state, the first sprocket is slidable relative to the locking device in the axial direction.

[0004] In the case of the sprocket assembly according to the first configuration, the locking device allows the smallest sprocket to slide relative to the locking device in the axial direction during the assembled state and before the installed state. Therefore, if the smallest sprocket is too small to be directly installed to the sprocket support body, it is possible to smoothly install the smallest sprocket to the sprocket support body of the rear hub assembly via the locking device. Therefore, it is possible to provide a sprocket assembly with a wider gear range while allowing the first sprocket to be smoothly installed to the rear hub assembly.

[0005] According to a second aspect of the present invention, the sprocket assembly is configured such that the first axial end has a first thread configured to engage with the thread of the sprocket support body provided to the rear hub assembly in the installed state.

[0006] In the case of the sprocket assembly according to the second configuration, the first threads of the first locking member enable the locking device to be easily attached to and detached from the sprocket support body of the rear hub assembly.

[0007] According to a third embodiment of the present invention, the sprocket assembly is configured such that the second axial end has a second thread after the second embodiment. The third axial end has a third thread configured to engage with the second threads of the first locking member in the assembled state.

[0008] In the case of the sprocket assembly after the third state, the second threads of the first locking member and the third threads 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.

[0009] According to a fourth embodiment of the present invention, after the third embodiment, the sprocket assembly is configured such that the first locking member is included on a first surface facing radially outward in the radial direction. The first surface is adjacent to the first threads. The second locking member is included on a second surface facing radially outward in the radial direction. The second surface is adjacent to the third threads. The first surface is positioned radially outward from the second surface in the radial direction in the assembled state.

[0010] In the case of the sprocket assembly according to the fourth configuration, the second surface can be arranged radially inward relative to the rotation center axis from the first surface in the assembled state. Therefore, it is possible to arrange the second surface more radially inward to expand the radially disposed space between the second surface and at least one of the first sprocket and an adjacent sprocket. Therefore, it is possible to improve the discharge of foreign matter such as mud from the radially disposed space between the second surface and at least one of the first sprocket and the adjacent sprocket.

[0011] According to a fifth aspect of the present invention, the sprocket assembly is configured such that the second surface is disposed between the third threads and the at least one radial protrusion after the fourth aspect.

[0012] In the case of the sprocket assembly according to the fifth state sample, it is possible to arrange the second surface more radially inward, thereby expanding the radially disposed space between the second surface and the first sprocket. Therefore, it is possible to improve the discharge of foreign matter such as mud from the radially disposed space between the second surface and the first sprocket.

[0013] According to a sixth embodiment of the present invention, after the fifth embodiment, the sprocket assembly is configured such that the first threads of the first locking member extend radially outward from the first surface in the radial direction. The first threads have a first maximum radial 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 maximum radial protrusion diameter. The first minimum radial diameter of the first sprocket opening is smaller than each of the first maximum radial thread diameter of the first threads and the maximum radial protrusion diameter of the at least one radial protrusion.

[0014] In the case of the sprocket assembly according to the sixth state, the first sprocket and the locking device are assembled as a unit so that the first sprocket can be easily attached to the sprocket support body of the rear wheel hub assembly and detached from the sprocket support body.

[0015] According to a seventh embodiment of the present invention, the sprocket assembly is configured such that the first sprocket has a first radial minimum portion, which is one of the first radial minimum diameters defining the opening of the first sprocket. The first radial minimum portion of the first sprocket is radially outward from the second surface in the assembled state.

[0016] In the case of the sprocket assembly according to the seventh state sample, it is possible to expand the space radially disposed between the second surface and the first sprocket. Therefore, it is possible to improve the discharge of foreign matter such as mud from the space radially disposed between the second surface and the first sprocket.

[0017] According to an eighth embodiment of the present invention, after any one of the second to seventh embodiments, the sprocket assembly is configured such that, in the assembled state, the first sprocket can slide in the axial direction between the first threads of the first locking member and the at least one radial protrusion of the second locking member.

[0018] In the case of the sprocket assembly after the eighth state, it is possible to adjust the rotational position of the first sprocket relative to the rotational center axis of the rear sprocket assembly in a circumferential direction relative to the sprocket support body of the rear hub assembly.

[0019] According to a ninth embodiment of the present invention, after any one of the first to eighth embodiments, the sprocket assembly 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.

[0020] In the case of the sprocket assembly after the ninth state, it is possible to easily assemble the first locking member and the second locking member using the first tool engagement profile and the second tool engagement profile.

[0021] According to a tenth embodiment of the present invention, after any one of the second to ninth embodiments, the sprocket assembly is configured such that the locking device is configured to, in the assembled state, place the first sprocket in the axial direction between the first threads of the first locking member and the at least one radial protrusion of the second locking member.

[0022] In the case of the sprocket assembly after the tenth state, it is possible to adjust the rotational position of the first sprocket relative to the rotational center axis of the rear sprocket assembly in a circumferential direction relative to the sprocket support body of the rear hub assembly.

[0023] According to an eleventh embodiment of the present invention, after any one of the first to tenth embodiments, the sprocket assembly is configured such that the first locking member has an axial contact surface. The axial contact surface is configured to contact the third axial end of the second locking member in the assembled state.

[0024] In the case of the sprocket assembly according to the eleventh state, when the first locking member and the second locking member are assembled to the sprocket support body, it is possible to provide better coupling strength between the locking device and the sprocket support body.

[0025] According to a twelfth embodiment of the present invention, after any one of the first to eleventh embodiments, the sprocket assembly is configured such 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 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 disposed on the first axially inward surface. The first axially inward torque transmission profile is configured to engage, in the installed state, in a torque transmission manner with a second axially outward torque transmission profile of a second sprocket adjacent to the first sprocket in the axial direction, without any other sprocket between the first sprocket and the second sprocket.

[0026] In the case of the sprocket assembly after the twelfth state, it is possible to reliably transmit the rotational force system between the first sprocket and the second sprocket.

[0027] According to one of the thirteenth states of the present invention, after any of the first to twentieth states, the sprocket assembly is configured such 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.

[0028] In the case of the sprocket assembly according to the thirteenth state, even if at least one of the first locking member and the second locking member includes a large-diameter component having a large outer diameter that is larger than one of the inner diameters of the first sprocket, it is possible to assemble the first sprocket and the locking device into a unit and / or to replace the first sprocket with a new sprocket when the first locking member is removed from the second locking member.

[0029] According to a fourteenth aspect of the present invention, a rear sprocket assembly is configured for mounting to a rear wheel 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 relative to a rotational central axis of the rear sprocket assembly. The first sprocket opening is configured to receive a hub axle of the rear wheel hub assembly in an mounted state in which the rear sprocket assembly is mounted to the rear wheel hub assembly. The first sprocket opening has a first radial minimum diameter smaller than the outermost diameter of a sprocket support body of the rear wheel hub assembly. The locking device is configured to secure the rear sprocket assembly to the sprocket support body of the rear wheel 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 configured to engage with the threads of the sprocket support body disposed to the rear wheel hub assembly in the installed state. The first thread has a first radial maximum thread diameter. The axially outward end is opposite the axially inward end in the axial direction and has at least one radial protrusion configured to abut against 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 and the radial maximum protrusion diameter of the at least one radial protrusion. The locking device is configured such that, in the assembled state and prior to the installed state, the first sprocket can slide relative to the locking device in the axial direction.

[0030] In the case of the sprocket assembly according to the fourteenth configuration, the locking device allows the smallest sprocket to slide relative to the locking device in the axial direction during the assembled state and before the installed state. Therefore, if the smallest sprocket is too small to be directly installed to the sprocket support body, it is possible to smoothly install the smallest sprocket to the sprocket support body of the rear hub assembly via the locking device. Therefore, it is possible to provide a sprocket assembly with a wider gear range while allowing the first sprocket to be smoothly installed to the rear hub assembly.

[0031] According to one of the fifteenth embodiments of the present invention, the sprocket assembly is configured such that the locking device is a single-piece component after the fourteenth embodiment.

[0032] In the case of the sprocket assembly after the fifteenth state, it is possible to improve the strength of the locking device.

[0033] According to a sixteenth aspect of the present invention, after the fifteenth aspect, the sprocket assembly is configured such that the at least one radial protrusion of the locking device is formed by material deformation.

[0034] In the case of the sprocket assembly according to the sixteenth state, even if the locking device includes a large-diameter component having a large outer diameter that is larger than one of the inner diameters of the first sprocket, it is possible to assemble the first sprocket and the locking device into a single unit.

[0035] According to a seventeenth aspect of the present invention, a locking device for mounting a plurality of rear sprockets to a rear wheel hub assembly for a human-powered vehicle includes a first locking member and a second locking member. The first locking member includes a first axial end, a second axial end, and a first surface. The first axial end is configured to be detachably attached to a sprocket support body of the rear wheel hub assembly in an installed state in which the plurality of rear sprockets are mounted to the rear wheel hub assembly. The second axial end is opposite to the first axial end in an axial direction relative to a rotational center axis of the plurality of rear sprockets. The first surface faces radially outward in a radial direction relative to the rotational center axis. The second locking member includes 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 a minimum sprocket is assembled with the locking device as 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 against the smallest sprocket among the plurality of rear sprockets in the axial direction in the installed state. The first surface is positioned radially outward from the second surface in the assembled state. The plurality of rear sprockets includes an adjacent sprocket adjacent to the smallest sprocket in the axial direction, with no other sprocket between the adjacent sprocket and the smallest sprocket. The locking device is configured such that, in the assembled state and prior to the installed state, the adjacent sprocket can slide relative to the locking device in the axial direction within a space radially outward from the first surface and the second surface.

[0036] In the case of the locking device according to the seventeenth configuration, in the assembled state and before the installed state, the adjacent sprocket can slide relative to the locking device in the axial direction within a space radially outward from the first surface and the second surface. Therefore, if at least one of the smallest sprocket and the adjacent sprocket is too small to be directly mounted to the sprocket support body, it is possible to smoothly mount the smallest sprocket and the adjacent sprocket to the sprocket support body of the rear hub assembly via the locking device. Therefore, it is possible to provide a rear sprocket assembly with a wider gear range while allowing at least one of the smallest sprocket and the adjacent sprocket to be smoothly mounted to the rear hub assembly.

[0037] According to one eighteenth embodiment of the present invention, the locking device according to the seventeenth embodiment is configured such that, in the assembled state, the smallest sprocket is stationary relative to the locking device in the axial direction.

[0038] In the case of the locking device according to the eighteenth state, it is possible to reduce the size of the locking device in the axial direction while making it possible to smoothly install the smallest sprocket and at least one of the adjacent sprockets into the rear wheel hub assembly.

[0039] According to a nineteenth embodiment of the present invention, the locking device according to the seventeenth or eighteenth embodiment is configured such that the first axial end has a first thread configured to engage with the thread of a sprocket support body provided to the rear wheel hub assembly in the installed state.

[0040] In the case of the locking device according to the nineteenth state, the first threads of the first locking member enable the locking device to be easily attached to and detached from the sprocket support body of the rear wheel hub assembly.

[0041] According to one of the twentieth embodiments of the present invention, the locking device according to any one of the seventeenth to nineteenth embodiments is configured such 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.

[0042] In the case of the locking device according to the twentieth state, even if at least one of the first locking member and the second locking member includes a large diameter component having a large outer diameter that is larger than the inner diameter of the minimum sprocket, it is possible to assemble the minimum sprocket with the locking device as a unit and / or to replace the minimum sprocket with a new sprocket when the first locking member is removed from the second locking member.

Implementation Method

[0071] Cross-reference to related applications

[0072] This application is a partial continuation-in-process of U.S. Patent Application No. 17 / 244,862, filed April 29, 2021. The contents of that application are incorporated herein by reference in their entirety.

[0073] Embodiments will now be described with reference to the accompanying drawings, wherein similar element symbols designate corresponding or identical elements throughout the various drawings.

[0074] As shown in Figure 1, a human-powered vehicle 2 includes a vehicle body 4 and a drive system 6. The drive system 6 includes a rear sprocket assembly 10 and a rear wheel hub assembly 12. The rear wheel hub assembly 12 is fixed to the vehicle body 4. The rear sprocket assembly 10 is configured to be mounted to the rear wheel hub assembly 12 of the human-powered vehicle 2. The rear sprocket assembly 10 is rotatably supported relative to the vehicle body 4 by the rear wheel hub assembly 12 about a rotational central axis A1. The human-powered vehicle 2 has an axial central plane CP. The axial central plane CP is defined in a lateral central position of the vehicle body 4 of the human-powered vehicle 2. The axial central plane CP is perpendicular to the rotational central axis A1.

[0075] The drive 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 engages with the front sprocket 6B and the rear sprocket assembly 10 to transmit pedaling force from the front sprocket 6B to the rear sprocket assembly 10. In this embodiment, the front sprocket 6B includes a single sprocket. However, the front sprocket 6B may include a plurality of sprockets.

[0076] In this application, the following directional terms "forward," "rear," "forward-facing," "rearward," "left," "right," "lateral," "upward," and "downward," as well as any other similar directional terms, refer to the direction determined by a user (e.g., a cyclist) in a standard position in the human-powered vehicle 2 when facing a handlebar or steering lever (e.g., on a saddle or seat). Therefore, the terms used to describe the rear sprocket assembly 10, the rear hub assembly 12, or other components should be interpreted relative to a vertical riding position on a horizontal surface of the human-powered vehicle 2 equipped with the rear sprocket assembly 10, the rear hub assembly 12, or other components.

[0077] In this application, a human-powered vehicle includes various types of bicycles, such as a mountain bike, a road bike, a city bike, a cargo bike, a hand-held bicycle, and a recumbent bicycle. Furthermore, the human-powered vehicle includes an electric bicycle (E-bike). An electric bicycle includes an electrically assisted bicycle configured to use an electric motor to assist the propulsion of the vehicle. However, the total number of wheels of the human-powered vehicle is not limited to two. For example, the human-powered vehicle includes a vehicle having one wheel or three or more wheels. In particular, the human-powered vehicle does not include a vehicle that uses only an internal combustion engine as its power source. Generally, a light road vehicle is assumed to be the human-powered vehicle, which includes a vehicle that does not require a public road driver's license.

[0078] As shown in Figure 2, the rear sprocket assembly 10 includes a plurality of rear sprockets SP. The plurality of rear sprockets SP are configured to engage with a chain C. The plurality of rear sprockets SP includes first sprockets SP1 to twelfth sprockets SP12. That is, the rear sprocket assembly 10 includes first sprocket SP1 and second sprocket SP2. However, the total number of the plurality of sprockets SP is not limited to twelve.

[0079] The rear wheel assembly 12 includes a wheel hub axle 14, a wheel hub body 16, and a sprocket support body 18. The wheel hub axle 14 is configured to be fixed to the vehicle body 4 of the human-powered vehicle 2 (see, for example, FIG. 1). The wheel hub body 16 is rotatably mounted on the wheel hub axle 14 about a rotation center axis A1. The sprocket support body 18 is rotatably mounted on the wheel hub axle 14 about a rotation center axis A1.

[0080] The rear sprocket assembly 10 is configured to be mounted to the sprocket support body 18. The sprocket support body 18 includes a plurality of external splines 18A. The rear sprocket assembly 10 is configured to engage with the plurality of external splines 18A of the sprocket support body 18.

[0081] As shown in Figure 3, the rear wheel 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 wheel hub body 16 about the rotational central axis A1 in only one rotational direction. The ratchet structure 20 is also configured to restrict the sprocket support body 18 from rotating relative to the wheel hub body 16 about the rotational central axis A1 in another rotational direction.

[0082] 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 an 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 can also be referred to as an adjacent sprocket SP2. Therefore, the plurality of rear sprockets SP includes an adjacent sprocket SP2. In this embodiment, the first sprocket outer diameter DM1 is the smallest among the outer diameters of the first sprocket SP1 to the twelfth sprocket SP12. Therefore, the first sprocket SP1 can also be referred to as a minimum sprocket SP1. Therefore, the first sprocket SP1 is one of the minimum sprockets SP1 in the rear sprocket assembly 10. The first sprocket SP1 can also be referred to as a top gear sprocket SP1. The adjacent sprocket SP2 is adjacent to the minimum sprocket SP1 in the axial direction D1, and there is no other sprocket between the adjacent sprocket SP2 and the minimum sprocket SP1.

[0083] The third sprocket SP3 has an outer diameter DM3 that is larger than that of the second sprocket DM2. The third sprocket SP3 is adjacent to the second sprocket SP2 in the axial direction D1, and there is no other sprocket between the second sprocket SP2 and the third sprocket SP3.

[0084] The rear sprocket assembly 10 includes a sprocket carrier 22. Sixth sprockets SP6 to twelfth sprockets SP12 are mounted on the sprocket carrier 22. In this embodiment, the sixth sprockets SP6 to twelfth sprockets SP12 are secured to the sprocket carrier 22 using fasteners 24 such as rivets. However, the total number of sprockets secured to the sprocket carrier 22 is not limited to the embodiment illustrated in FIG3. The sprocket carrier 22 is configured to contact a positioning surface 18C of the sprocket support body 18. However, the structure of the sprocket carrier 22 is not limited to the structure illustrated in FIG3. The sprocket carrier 22 may be omitted from the rear sprocket assembly 10 if needed and / or desired. In this case, all sprockets directly engage with the sprocket support body 18.

[0085] As shown in Figure 4, 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 the outer diameter DM1 of the first sprocket. 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 that defines the first radial minimum diameter DM11 of the first sprocket opening SPO13. In this embodiment, the total number of first sprocket teeth SPT12 is nine. However, the total number of first sprocket teeth SPT12 is not limited to nine.

[0086] As shown in Figure 5, 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 the radial direction. The plurality of second sprocket teeth SPT22 defines the outer diameter DM2 of the second sprocket. The second sprocket opening SPO23 of the second sprocket SP2 has a second diameter DM21. In this embodiment, the total number of second sprocket teeth SPT22 is ten. However, the total number of second sprocket teeth SPT22 is not limited to ten.

[0087] As shown in Figure 6, the first sprocket opening SPO13 is configured to receive the hub axle 14 of the rear hub assembly 12 in an installed state in which the rear sprocket assembly 10 is mounted to one of the rear hub assemblies 12. The first diameter DM11 is smaller than the outermost diameter DM6 of one of the sprocket support bodies 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 that is smaller than the outermost diameter DM6 of the sprocket support body 18 of the rear hub assembly 12. A plurality of spline teeth 18A define the outermost diameter DM6. However, depending on need and / or expectation, the first diameter DM11 may be greater than or equal to the outermost diameter DM6 of the sprocket support body 18.

[0088] The second sprocket opening SPO23 is configured to receive the hub axle 14 of the rear hub assembly 12 in the installed state. The second diameter DM21 is smaller than the outermost diameter DM6 of the sprocket support body 18 of the rear hub assembly 12. The second diameter DM21 is larger than the first diameter DM11. However, as needed and / or desired, the second diameter DM21 may be smaller than or equal to the first diameter DM11. As needed and / or desired, the second diameter DM21 may be larger than or equal to the outermost diameter DM6 of the sprocket support body 18.

[0089] A sprocket support body 18 includes an axial end 18B disposed on the outermost axial end of one of the sprocket support bodies 18 in the axial direction D1. A hub axle 14 includes an axial end 14B disposed on the outermost axial end of one of the hub axles 14 in the axial direction D1. A first sprocket SP1 is configured to be disposed between axial ends 14B and 18B in the axial direction D1. A second sprocket SP2 is configured to be disposed between axial ends 14B and 18B in the axial direction D1.

[0090] The rear sprocket assembly 10 includes a locking device 26. The locking device 26 is configured to secure the rear sprocket assembly 10 to the sprocket support body 18 of the rear hub assembly 12 in this installed state. The locking device 26 is configured to mount the first sprocket SP1 and the second sprocket SP2 to the rear hub assembly 12. As seen in FIG3, the locking device 26 is configured to attach to the sprocket support body 18 in the axial direction D1 to hold the sprocket carrier 22 and the first sprocket SP1 to the fifth sprocket SP5 between the locking device 26 and the positioning surface 18C of the sprocket support body 18.

[0091] As seen in Figure 6, 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 wheel hub assembly 12 of the 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.

[0092] The first locking member 28 is configured to detachably engage with the sprocket support body 18 of the rear wheel hub assembly 12 in this installed state. The second locking member 30 is configured to detachably engage with the first locking member 28 so as to abut against the first sprocket SP1 in the axial direction D1 in the installed state. In this embodiment, the first locking member 28 is a separate member from the second locking member 30. However, depending on need and / or expectation, the first locking member 28 and the second locking member 30 can be integrally configured as a single piece.

[0093] The first locking member 28 is configured to detachably engage 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 both the first sprocket opening SPO13 and the second sprocket opening SPO23 in the installed state.

[0094] As used herein, the terms "detachable" or "detachably" encompass a configuration in which one element can be repeatedly detached from and repeatedly attached to another element without material damage.

[0095] As seen in Figures 7 and 8, the rear sprocket assembly 10 includes at least one tooth position maintaining member 32. The at least one tooth position maintaining member 32 is configured to maintain a relative position between a plurality of first sprocket teeth SPT12 and a plurality of second sprocket teeth SPT22 in a circumferential direction D2 relative to the rotational central axis A1. In this embodiment, the rear sprocket assembly 10 includes the tooth position maintaining member 32. However, the rear sprocket assembly 10 may include a plurality of tooth position maintaining members 32 as needed and / or desired. At least one tooth position maintaining member 32 may be omitted from the rear sprocket assembly 10 as needed and / or desired.

[0096] At least one tooth position maintaining member 32 includes a fixing portion 34 and at least one guiding 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 guiding portion 36 is configured to engage with the other of the first sprocket SP1 and the second sprocket SP2, such that the other of the first sprocket SP1 and the second sprocket SP2 can slide relative to the first sprocket SP1 and the second sprocket SP2 in the axial direction D1.

[0097] In this embodiment, the tooth position maintaining member 32 includes a fixing portion 34 and at least one guiding portion 36. The fixing portion 34 is fixed to the first sprocket SP1. The fixing portion 34 is fixed to the first sprocket SP1 by a press-fit method. 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 an annular shape.

[0098] At least one guide portion 36 is configured to engage with the second sprocket SP2, such that the second sprocket SP2 can slide relative to the first sprocket SP1 in the axial direction D1. However, as needed and / or desired, the fixing portion 34 may be configured to be fixed to the first sprocket SP1. As needed 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. As needed and / or desired, at least one guide portion 36 may be configured to engage with the first sprocket SP1, such that the first sprocket SP1 can slide relative to the second sprocket SP2 in the axial direction D1.

[0099] At least one guide portion 36 comprises a plurality of guide portions 36. At least one guide portion 36 comprises 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.

[0100] In this embodiment, at least one guide portion 36 includes a first guide portion 36A, a second guide portion 36B, and a third guide portion 36C, and does not include other guide portions configured to engage with the second sprocket SP2 such that the second sprocket SP2 can slide relative to the first sprocket SP1 in the axial direction D1. However, the total number of at least one guide portion 36 is not limited to three.

[0101] 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 such that the second sprocket SP2 can slide relative to the first sprocket SP1 in the axial direction D1. However, as needed and / or desired, at least one guide portion 36 may be configured to engage with the first sprocket SP1 such that the first sprocket SP1 can slide relative to the second sprocket SP2 in the axial direction D1.

[0102] As seen in Figures 9 and 10, 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 in the axial direction D1. In this 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 in the axial direction D1. The second guide portion 36B is configured to be movably disposed in the second guide groove 37B in the axial direction D1. The third guide portion 36C is configured to be movably disposed in the third guide groove 37C in the axial direction D1.

[0103] Depending on need and / or expectation, at least one tooth position maintaining member 32 may include a plurality of tooth position maintaining members. In these embodiments, the tooth position maintaining members are separate members from each other. Each of the tooth position maintaining members includes a fixing portion 34 and at least one guiding portion 36. Furthermore, depending on need and / or expectation, at least one tooth position maintaining member 32 and one of the first sprocket SP1 and the second sprocket SP2 may be integrally configured as a single piece.

[0104] As seen in Figures 11 and 12, at least one guide portion 36 is arranged radially outward from the fixed portion 34. A first guide portion 36A is arranged radially outward from the fixed portion 34. A second guide portion 36B is arranged radially outward from the fixed portion 34. A third guide portion 36C is arranged radially outward from the fixed portion 34.

[0105] At least one guide portion 36 extends in the axial direction D1. A first guide portion 36A extends in the axial direction D1. A second guide portion 36B extends in the axial direction D1. A third guide portion 36C extends in the axial direction D1.

[0106] At least one guide portion 36 extends in the circumferential direction D2. A first guide portion 36A extends in the circumferential direction D2. A second guide portion 36B extends in the circumferential direction D2. A third guide portion 36C extends in the circumferential direction D2.

[0107] At least one tooth position maintaining member 32 includes at least one connecting portion 38. The at least one connecting portion 38 connects at least one guide portion 36 to a fixed portion 34. The at least one connecting portion 38 extends in one of the directions intersecting the rotation center axis A1.

[0108] At least one connecting portion 38 includes a plurality of connecting portions 38. The plurality of connecting portions 38 includes a first connecting portion 38A, a second connecting portion 38B, and a third connecting portion 38C. The first connecting portion 38A connects the first guiding portion 36A to the fixed portion 34. The second connecting portion 38B connects the second guiding portion 36B to the fixed portion 34. The third connecting portion 38C connects the third guiding portion 36C to the fixed portion 34.

[0109] The first connecting portion 38A extends from the fixed portion 34 to the first guiding portion 36A in the axial direction D1. The first connecting portion 38A extends from the fixed portion 34 to the first guiding portion 36A in a first axial direction D11. The first axial direction D11 is parallel to the axial direction D1. The first connecting portion 38A extends radially outward from the fixed portion 34 to the first guiding portion 36A. The first guiding portion 36A extends from the first connecting portion 38A in the first axial direction D11.

[0110] The second connecting portion 38B extends from the fixed portion 34 to the second guiding portion 36B in the axial direction D1. The second connecting portion 38B extends from the fixed portion 34 to the second guiding portion 36B in the first axial direction D11. The second connecting portion 38B extends radially outward from the fixed portion 34 to the second guiding portion 36B. The second guiding portion 36B extends from the second connecting portion 38B in the first axial direction D11.

[0111] The third connecting portion 38C extends from the fixed portion 34 to the third guiding portion 36C in the axial direction D1. The third connecting portion 38C extends from the fixed portion 34 to the third guiding portion 36C in the first axial direction D11. The third connecting portion 38C extends radially outward from the fixed portion 34 to the third guiding portion 36C. The third guiding portion 36C extends from the third connecting portion 38C in the first axial direction D11.

[0112] The fixed 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.

[0113] In this 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, as needed 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. As needed and / or desired, the first axial length L11 may be less than or equal to the first radial length L12.

[0114] 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.

[0115] In this 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 this embodiment, the second axial length L21 is 3 mm. However, the second axial length L21 is not limited to the above range and length. Depending on need and / or expectation, 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. Depending on need and / or expectation, the second axial length L21 may be less than or equal to the second radial length L22.

[0116] The tooth position maintaining member 32 includes at least one protrusion 40. The at least one protrusion 40 is configured to position the tooth position maintaining member 32 relative to the first sprocket SP1 when the tooth position maintaining member 32 is attached to the first sprocket SP1. The at least one protrusion 40 is configured to restrict a relative rotation between the tooth position maintaining member 32 and the first sprocket SP1 in the circumferential direction D2 when the tooth position maintaining 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 includes a first protrusion 40A, a second protrusion 40B, and a third protrusion 40C.

[0117] The first protrusion 40A is disposed in a circumferential position corresponding to one of the circumferential positions of the first guide portion 36A. The first protrusion 40A protrudes from the fixed portion 34 in the axial direction D1. The first protrusion 40A protrudes from the fixed portion 34 in a second axial direction D12, which is opposite to the first axial direction D11. The second axial direction D12 is parallel to the first axial direction D11. As needed and / or desired, the first protrusion 40A may be offset from the first guide portion 36A in the circumferential direction D2. As needed and / or desired, the first protrusion 40A may be omitted from the tooth position maintaining member 32.

[0118] The second protrusion 40B is disposed in a circumferential position corresponding to one of the circumferential positions of the second guide portion 36B. The second protrusion 40B protrudes from the fixed portion 34 in the axial direction D1. The second protrusion 40B protrudes from the fixed portion 34 in the second axial direction D12. As needed and / or desired, the second protrusion 40B may be offset from the second guide portion 36B in the circumferential direction D2. As needed and / or desired, the second protrusion 40B may be omitted from the tooth position maintaining member 32.

[0119] The third protrusion 40C is disposed in a circumferential position corresponding to one of the circumferential positions of the third guide portion 36C. The third protrusion 40C protrudes from the fixed portion 34 in the axial direction D1. The third protrusion 40C protrudes from the fixed portion 34 in the second axial direction D12. As needed and / or desired, the third protrusion 40C may be offset from the third guide portion 36C in the circumferential direction D2. As needed and / or desired, the third protrusion 40C may be omitted from the tooth position maintaining member 32.

[0120] As seen in Figures 9 and 10, 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 includes a first positioning recess 41A, a second positioning recess 41B, and a third positioning recess 41C. A first protrusion 40A is configured to be disposed in the first positioning recess 41A when the tooth position maintaining member 32 is fixed to the first sprocket SP1. A second protrusion 40B is configured to be disposed in the second positioning recess 41B when the tooth position maintaining member 32 is fixed to the first sprocket SP1. A third protrusion 40C is configured to be disposed in the third positioning recess 41C when the tooth position maintaining member 32 is fixed to the first sprocket SP1.

[0121] As shown in Figure 13, when viewed from the axial direction D1, the first guide portion 36A, the second guide portion 36B, and the third guide portion 36C form an isosceles triangle. Depending on the needs and / or expectations, the first guide portion 36A, the second guide portion 36B, and the third guide portion 36C can be arranged in a constant or differently spaced circular configuration.

[0122] When viewed along the rotation center axis A1, a first circumferential center plane 36A1 is defined to bisect the first circumferential length L13 of the first guide portion 36A. When viewed along the rotation center axis A1, the first circumferential center plane 36A1 extends radially outward from the rotation center axis A1 to bisect the first circumferential length L13.

[0123] When viewed along the rotation center axis A1, a second circumferential center plane 36B1 is defined to bisect the second circumferential length L23 of the second guide portion 36B. When viewed along the rotation center axis A1, the second circumferential center plane 36B1 extends radially outward from the rotation center axis A1 to bisect the second circumferential length L23.

[0124] When viewed along the rotation center axis A1, a third circumferential center plane 36C1 is defined to bisect the third circumferential length L32 of the third guide portion 36C. When viewed along the rotation center axis A1, the third circumferential center plane 36C1 extends radially outward from the rotation center axis A1 to bisect the third circumferential length L32.

[0125] A first circumferential angle AG1 is defined in the circumferential direction D2 between the first circumferential center plane 36A1 and the second circumferential center plane 36B1. A second circumferential angle AG2 is defined in the circumferential direction D2 between the second circumferential center plane 36B1 and the third circumferential center plane 36C1. A third circumferential angle AG3 is defined in the circumferential direction D2 between the first circumferential center plane 36A1 and the third circumferential center plane 36C1.

[0126] The first circumferential angle AG1 is equal to the third circumferential angle AG3. The second circumferential angle AG2 is different from both the first circumferential angle AG1 and the third circumferential angle AG3. The second circumferential angle AG2 is less than both the first circumferential angle AG1 and the third circumferential angle AG3. However, as needed and / or desired, the second circumferential angle AG2 may be greater than or equal to at least one of the first circumferential angle AG1 and the third circumferential angle AG3. As needed and / or desired, the first circumferential angle AG1 may be different from the third circumferential angle AG3.

[0127] The second circumferential angle AG2 is different from the first circumferential angle AG1 and the third circumferential angle AG3. Therefore, in the state in which the tooth position maintaining member 32 is fixed to one of the first sprockets SP1 and in the state in which 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 one of the first sprockets SP1.

[0128] 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 against at least one guide portion 36 in order to maintain the relative position between the plurality of first sprocket teeth SPT12 and the plurality of second sprocket teeth SPT22 in the circumferential direction D2.

[0129] The second sprocket body SPB21 has a plurality of first circumferential abutting surfaces 42A, which are configured to abut against the first guide portion 36A to maintain the relative position between the plurality of first sprocket teeth SPT12 and the plurality of second sprocket teeth SPT22 in the circumferential direction D2. In the installed state, the first guide portion 36A is disposed between each of the first circumferential abutting surfaces 42A in the circumferential direction D2. The first circumferential abutting surfaces 42A define a first guide groove 37A.

[0130] The second sprocket body SPB21 has a plurality of second circumferential abutting surfaces 42B, which are configured to abut against the second guide portion 36B to maintain the relative position between the plurality of first sprocket teeth SPT12 and the plurality of second sprocket teeth SPT22 in the circumferential direction D2. In the installed state, the second guide portion 36B is disposed between each of the second circumferential abutting surfaces 42B in the circumferential direction D2. The second circumferential abutting surfaces 42B define second guide grooves 37B.

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

[0132] As shown in FIG14, 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 wheel hub assembly 12 in an installation state in which the plurality of rear sprockets SP are mounted to one of the rear wheel hub assemblies 12.

[0133] 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 can also be referred to as the first thread 28D. The first internal thread 28E can 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.

[0134] The first locking member 28 includes a first surface 28C. The first surface 28C faces radially outward in the radial direction relative to the rotation center axis A1. The first surface 28C is adjacent to a first external thread 28D. The first surface 28C extends from the first external thread 28D in the axial direction D1. A first internal thread 28E is provided radially inward from 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 radially outward from the first surface 28C in the radial direction.

[0135] The first external thread 28D of the first locking member 28 extends radially outward from the first surface 28C. 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 disposed to the rear wheel hub assembly 12 in the installed state. The internal thread 18D is disposed at the axial end 18B of the sprocket support body 18. The internal thread 18D may also be referred to as thread 18D. Therefore, the first thread 28D is configured to engage with the thread 18D of the sprocket support body 18 disposed to the rear wheel hub assembly 12 in the installed state in which the rear sprocket assembly 10 is installed to the rear wheel hub assembly 12.

[0136] 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, wherein the first sprocket SP1 and the locking device 26 are assembled as a 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, wherein the smallest sprocket SP1 and the locking device 26 are assembled as a 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, wherein the locking device 26, the first sprocket SP1, and the second sprocket SP2 are assembled as a 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, wherein the first or smallest sprocket SP1 and the locking device 26 are assembled as a 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, wherein the locking device 26, the first sprocket SP1 and the second sprocket SP2 are assembled as a unit.

[0137] 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.

[0138] 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 at least one radial protrusion 30F. The second surface 30C is adjacent to the third thread 30D. The second surface 30C is adjacent to at least one radial protrusion 30F in the axial direction D1. The second surface 30C is disposed between the third thread 30D and at least one radial protrusion 30F. The first surface 28C of the first locking member 28 is radially outward from the second surface 30C of the second locking member 30 in the assembled state in which the first sprocket SP1 and the locking device 26 are assembled as a unit. The first radial minimum portion SP19 of the first sprocket SP1 is radially outward from the second surface 30C in the assembled state in which the first sprocket SP1 and the locking device 26 are assembled as a unit.

[0139] 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 engage with the second thread 28E of the first locking member 28 in an assembled state in which the first sprocket SP1 and the locking device 26 are assembled as a 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.

[0140] 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, in an installation state in which 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, in an installation state in which 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, in an installation state in which the rear sprocket assembly 10 is mounted to the rear hub assembly 12. At least one radial protrusion 30F has a flange shape. However, as needed and / or desired, at least one radial protrusion 30F may comprise a plurality of radial protrusions. As needed and / or desired, at least one radial protrusion 30F may have a shape other than a flange shape.

[0141] As shown in FIG8, the first axial end 28A of the first locking member 28 includes a first tool engagement profile 28G. In this 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.

[0142] As shown in FIG7, the fourth axial end 30B of the second locking member 30 includes a second tool engagement profile 30G. In this embodiment, at least one radial protrusion 30F includes the 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 circumferentially arranged at constant intervals. However, the structure of the second tool engagement profile 30G is not limited to the second tool engagement recesses 30G1.

[0143] A first tool engagement profile 28G is configured to engage with a first tool. A second tool engagement profile 30G is configured to engage with a second tool. In one state in which the first tool engages with the first tool engagement profile 28G and the second tool engages with the second tool engagement profile 30G, the first locking member 28 and the second locking member 30 are rotated relative to each other 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.

[0144] As shown in Figure 14, the locking device 26 is configured such that, in an assembled state in which the first sprocket SP1 and the locking device 26 are assembled as a unit, the first sprocket SP1 is positioned in the axial direction D1 between the first thread 28D of the first locking member 28 and at least one radial protrusion 30F of the second locking member 30. The locking device 26 is configured such that, in an assembled state in which the locking device 26, the first sprocket SP1, and the second sprocket SP2 are assembled as a unit, the first sprocket SP1 and the second sprocket SP2 are positioned in the axial direction D1 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.

[0145] The first sprocket SP1 and the second sprocket SP2 are configured to be positioned 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 be assembled in the assembled state, in which at least two sprockets of the plurality of rear sprockets SP are positioned in the axial direction D1 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.

[0146] At least two of the plurality of rear sprockets SP include a minimum sprocket SP1 and a maximum sprocket among the at least two sprockets. In this embodiment, the first locking member 28 and the second locking member 30 are configured such that, 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 as a unit, the first sprocket SP1 and the second sprocket SP2 are positioned in the axial direction D1 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. 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 minimum sprocket SP1 among the at least two sprockets. The second sprocket SP2 may also be referred to as the maximum sprocket SP2 among the at least two sprockets. However, as needed and / or desired, the at least two of the plurality of rear sprockets SP may include other sprockets among the plurality of rear sprockets SP.

[0147] The first sprocket opening SPO13 can also be referred to as a minimum sprocket opening SPO13. The first diameter DM11 of the first sprocket opening SPO13 can also be referred to as a minimum sprocket diameter DM11. Therefore, the minimum sprocket SP1 includes the minimum sprocket opening SPO13 with the minimum sprocket diameter DM11.

[0148] The second sprocket opening SPO23 can also be referred to as a maximum sprocket opening SPO23. The second diameter DM21 of the second sprocket opening SPO23 can also be referred to as a maximum sprocket diameter DM21. The maximum sprocket SP2 includes the maximum sprocket opening SPO23 having the maximum sprocket diameter DM21.

[0149] At least one radial protrusion 30F has a radial outer diameter DM4. The first external thread 28D has a large diameter DM5. The radial outer diameter DM4 of at least one radial protrusion 30F may also be referred to as a radial maximum protrusion diameter DM4. The large diameter DM5 of the first external thread 28D may 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.

[0150] The radial outer diameter DM4 of at least one radial protrusion 30F is greater than the first diameter DM11 of the first sprocket opening SPO13. The large diameter DM5 of the first external thread 28D is greater than the second diameter DM21 of the second sprocket opening SPO23. That is, the radial outer diameter DM4 of at least one radial protrusion 30F is greater than the minimum sprocket diameter DM11. The large diameter DM5 of the first external thread 28D is greater than the maximum sprocket diameter DM21. The first minimum radial diameter DM11 of the first sprocket opening SPO13 is less than each of the first maximum radial thread diameter DM5 of the first thread 28D and the maximum radial protrusion diameter DM4 of at least one radial protrusion 30F.

[0151] 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 as a 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 as a 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 of the plurality of rear sprockets SP are assembled as a 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 as a unit.

[0152] 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 mounting state in which the rear sprocket assembly 10 is mounted to the rear wheel hub assembly 12.

[0153] 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.

[0154] As seen in Figures 9 and 10, the first sprocket SP1 includes a first axially inward torque transmission profile SP16 disposed on a first axially inward surface SP15. The second sprocket SP2 includes a second axially outward torque transmission profile SP26 disposed on a 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 transmission 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 transmission manner in the axial direction D1, wherein there is no other sprocket between the first sprocket SP1 and the second sprocket SP2.

[0155] As shown in Figure 9, the first axially inward torque transmission profile SP16 includes a plurality of first teeth SP16A. The plurality of first teeth SP16A includes a plurality of first teeth SP16A1 and a first tooth SP16A2. The first tooth SP16A2 has a shape and / or size that is different from one of the first teeth SP16A1. In this embodiment, the first tooth SP16A2 has a circumferential width that is larger than one of the circumferential widths of the first teeth SP16A1.

[0156] As shown in FIG10, the second axially outward torque transmission profile SP26 includes a plurality of second recesses SP26A. The plurality of second recesses SP26A includes a plurality of second recesses SP26A1 and a second recess SP26A2. The second recess SP26A2 has a shape and / or size different from one of the plurality of second recesses SP26A1. In this embodiment, the second recess SP26A2 has a circumferential width larger than one of the circumferential widths of the second recesses SP26A1.

[0157] As seen in Figures 9 and 10, the first tooth SP16A of the first sprocket SP1 is configured to engage with the second recess SP26A of the second sprocket SP2 in a torque transmission manner. In this embodiment, the first tooth SP16A1 of the first sprocket SP1 is configured to engage with the second recess SP26A1 of the second sprocket SP2. The first tooth SP16A2 of the first sprocket SP1 is configured to engage with the second recess SP26A2 of the second sprocket SP2. The first tooth SP16A2 is configured not to engage with the second recess SP26A1 because the circumferential width of the first tooth SP16A2 is greater than the circumferential width of the second recess SP26A1. Therefore, the first tooth SP16A2 and the second recess SP26A2 define a single circumferential position of the first sprocket SP1 relative to the second sprocket SP2.

[0158] As seen in Figures 9 and 15, the second sprocket SP2 includes a second axially inward torque transmission profile SP27 disposed on a second axially inward surface SP25. The second axially inward torque transmission profile SP27 is configured to engage in a torque transmission manner with one of a torque transmission profile disposed on a third sprocket SP3 and a torque transmission profile disposed on a sprocket support body 18 disposed on a rear wheel hub assembly 12.

[0159] In this embodiment, as seen in FIG15, the second axially inward torque transmission profile SP27 is configured to engage with one of the torque transmission profiles SP37 disposed on the third sprocket SP3 in a torque transmission manner. However, as needed and / or desired, the second axially inward torque transmission profile SP27 may be configured to engage with one of the torque transmission profiles disposed on the sprocket support body 18 in a torque transmission manner.

[0160] As shown in Figure 9, the second axially inward torque transmission profile SP27 includes a plurality of second additional teeth SP27A. The plurality of second additional teeth SP27A includes 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 one of the other second additional teeth SP27A1. In this embodiment, the second additional tooth SP27A2 has a circumferential width larger than one of the circumferential widths of the second additional teeth SP27A1.

[0161] As shown in Figure 15, the torque transmission profile SP37 includes a plurality of third recesses SP37A. The plurality of third recesses SP37A includes a plurality of third recesses SP37A1 and a third recess SP37A2. The third recess SP37A2 has a shape and / or size different from one of the plurality of third recesses SP37A1. In this embodiment, the third recess SP37A2 has a circumferential width larger than that of one of the third recesses SP37A1.

[0162] As seen in Figures 9 and 15, the second tooth SP27A of the second sprocket SP2 is configured to engage with the third recess SP37A of the third sprocket SP3. In this embodiment, the second tooth SP27A1 of the second sprocket SP2 is configured to engage with the third recess SP37A1 of the third sprocket SP3. The second additional tooth SP27A2 of the second sprocket SP2 is configured to engage with the third recess SP37A2 of the third sprocket SP3. The second additional tooth SP27A2 is configured not to engage with the third recess SP37A1 because the circumferential width of the second additional tooth SP27A2 is greater than the circumferential width of the third recess SP37A1. Therefore, the second additional tooth SP27A2 and the third recess SP37A2 define the rotational position of the second sprocket SP2 relative to the third sprocket SP3.

[0163] As seen in Figures 6 and 15, the third sprocket SP3 includes an additional torque transmission profile SP38. In this embodiment, the additional torque transmission profile SP38 is configured to engage with a plurality of external splines 18A of the sprocket support body 18 in a torque transmission manner. The additional torque transmission profile SP38 and the plurality of external splines 18A define a single circumferential position of the third sprocket SP3 relative to one of the sprocket support bodies 18. 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. Rotational force is transmitted from the second sprocket SP2 to the sprocket support body 18 via the third sprocket SP3.

[0164] The following will describe the assembly procedure of assembling the first sprocket SP1, the second sprocket SP2, the locking device 26 and the tooth position maintaining member 32 into the rear wheel hub assembly 12 with reference to Figures 7 to 10 and Figures 16 to 18.

[0165] As shown in Figure 16, before assembling the first sprocket SP1 and the second sprocket SP2 to the rear hub assembly 12, the first sprocket SP1, the second sprocket SP2, the locking device 26, and the tooth position maintaining member 32 are assembled into a locking device assembly 50. The locking device assembly 50 includes the first sprocket SP1, the second sprocket SP2, the locking device 26, and the tooth position maintaining member 32.

[0166] The locking device 26 is configured such that, in the assembled state and before the rear sprocket assembly 10 is mounted to the rear hub assembly 12, the first sprocket SP1 can slide relative to the locking device 26 in the axial direction D1. The locking device 26 is configured such that, in the assembled state and before the plurality of rear sprockets SP are mounted to the rear hub assembly 12, in a space radially outward from the first surface 28C and the second surface 30C, the adjacent sprocket SP2 can slide relative to the locking device 26 in the axial direction D1.

[0167] In this embodiment, in the assembled state in which the rear sprocket assembly 10 is mounted to the rear hub assembly 12, the first sprocket SP1 can slide in the axial direction D1 between the first thread 28D of the first locking member 28 and at least one radial protrusion 30F of the second locking member 30. In the assembled state, before the rear sprocket assembly 10 is mounted to the rear hub assembly 12, the first sprocket SP1 can slide in the axial direction D1 between the first thread 28D of the first locking member 28 and at least one radial protrusion 30F of the second locking member 30. However, as needed and / or desired, the locking device 26 can be configured such that in the assembled state in which the plurality of rear sprockets SP are mounted to the rear hub assembly 12, the smallest sprocket SP1 is stationary in the axial direction D1 relative to the locking device 26. As needed and / or desired, the locking device 26 can be configured such that, in the assembled state, before the plurality of rear sprockets SP are mounted to the rear hub assembly 12, the smallest sprocket SP1 is stationary relative to the locking device 26 in the axial direction D1. In these embodiments, the locking device 26 is configured to, in the assembled state, before the mounting state, restrict axial movement of the smallest sprocket SP1 relative to one of the locking devices 26 in both the first axial direction D11 and the second axial direction D12. 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 maintaining member 32 relative to one of the locking devices 26 in the second axial direction D12. The second axial end 28B of the first locking member 28 contacts the tooth position maintaining member 32 to restrict axial movement of the first sprocket SP1 and the tooth position maintaining member 32 relative to one of the locking devices 26 in the first axial direction D11.

[0168] As seen in Figures 9 and 10, for example, the fixing portion 34 of the tooth position maintaining member 32 is inserted into the first sprocket opening SPO13 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 maintaining member 32 is fixed to the first sprocket SP1 in a single circumferential position.

[0169] The first guide portion 36A, the second guide portion 36B, and the third guide portion 36C are inserted into the first guide groove 37A, the second guide groove 37B, and the third guide groove 37C of the second sprocket SP2. Therefore, the second sprocket SP2 is assembled to the first sprocket SP1 via the tooth position maintaining member 32 in a single circumferential position relative to the first sprocket SP1.

[0170] As shown in Figure 16, the third axial end 30A of the second locking member 30 is inserted into the first sprocket opening SP013, the tooth position maintaining member 32 opening 34A, 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. Using the first and second tools, the first locking member 28 and the second locking member 30 are rotated relative to each other until the third axial end 30A contacts the axial contact surface 28F of the first locking member 28. Therefore, the first sprocket SP1, the second sprocket SP2, the locking device 26, and the tooth position maintaining member 32 are assembled into a locking device assembly 50.

[0171] As seen in Figure 17, when the locking device assembly 50 is assembled to the sprocket support body 18, the first axial end 28A of the first locking member 28 contacts the axial end 18B of the sprocket support body 18.

[0172] As seen in Figure 18, the second sprocket SP2 moves toward the third sprocket SP3 so that the second axially inward torque transmission profile SP27 engages with the torque transmission profile SP37 of the third sprocket SP3. The second sprocket SP2 rotates about the rotational center axis A1 relative to the sprocket support body 18 to adjust the rotational position of the second axially inward torque transmission profile SP27 relative to the torque transmission profile SP37 of the third sprocket SP3, specifically such that the second additional tooth SP27A2 of the second sprocket SP2 engages with the third recess SP37A2 of the third sprocket SP3. Since the tooth position maintaining member 32 is configured to couple the first sprocket SP1 and the second sprocket SP2 so that the second sprocket SP2 can slide relative to the first sprocket SP1 in the axial direction D1, the first sprocket SP1 and the tooth position maintaining member 32 respond to the rotation of the second sprocket SP2, together with the second sprocket SP2 rotating about the rotational center axis A1 relative to the sprocket support body 18. Therefore, in the state in which the second axial inward torque transmission profile SP27 and the torque transmission profile SP37 of the third sprocket SP3 are engaged, the first sprocket SP1, the second sprocket SP2 and the third sprocket SP3 are positioned relative to each other in a predetermined rotational position.

[0173] As seen in Figures 14 and 17, the locking device 26 is rotated about the rotation center axis A1 relative to the sprocket support body 18 using the second tool, causing the first external thread 28D of the first locking member 28 to be screwed into the internal thread 18D of the sprocket support body 18. Since the second axially inward torque transmission profile SP27 of the second sprocket SP2 engages with the torque transmission profile SP37 of the third sprocket SP3, the locking device 26 maintains a rotational position relative to the sprocket support body 18 between the second sprocket SP2 and the third sprocket SP3 while rotating relative to the sprocket support body 18. Since the guide portion 36 of the tooth position maintaining member 32 engages with the guide groove 37 of the second sprocket SP2, the locking device 26 maintains a rotational position relative to the sprocket support body 18 between the first sprocket SP1 and the second sprocket SP2 while rotating relative to the sprocket support body 18. Therefore, when the locking device 26 is tightened using the second tool, the first axially inward torque transmission profile SP16 and the second axially outward torque transmission profile SP26 smoothly engage. When the locking device 26 is tightened using this tool, the first sprocket SP1 and the second sprocket SP2 are held in the axial direction D1 between the radial protrusion 30F and the third sprocket SP3. Therefore, the first sprocket SP1 and the second sprocket SP2 are installed onto the sprocket support body 18 of the rear hub assembly 12 using the locking device 26 and the tooth position maintaining member 32.

[0174] The structure of the first sprocket SP1, the second sprocket SP2, and the tooth position maintaining member 32 can be applied to other rear sprocket assemblies. For example, the structure of the first sprocket SP1, the second sprocket SP2, and the tooth position maintaining member 32 can be applied to the rear sprocket assemblies 210, 310, and 410 illustrated in Figures 19 to 21. The rear sprocket assemblies 210, 310, and 410 illustrated in Figures 19 to 21 have a structure substantially the same as that of the rear sprocket assembly 10. The sprocket carrier 22 in this embodiment is omitted from the rear sprocket assemblies 210, 310, and 410.

[0175] As shown in Figure 19, the sprockets SP of the rear sprocket assembly 210 include sprockets SP201 to SP211. Sprockets SP207 to SP209 are fixed to each other by fasteners 225. The rear sprocket assembly 210 includes spacers SS21 and SS22. Spacer SS21 is disposed between sprocket SP207 and sprocket SP208. Spacer SS22 is disposed between sprocket SP208 and sprocket SP209. Sprockets SP207 to SP209 and spacers SS21 and SS22 are fixed to each other by fasteners 225.

[0176] Spacer SS21 includes a ring portion SS21A and a plurality of arms SS21B extending radially outward from the ring portion SS21A. The arms SS21B are arranged circumferentially. Spacer SS22 includes a ring portion SS22A and a plurality of arms SS22B extending radially outward from the ring portion SS22A. The arms SS22B are arranged circumferentially. The seventh sprocket SP207 to the ninth sprocket SP209 are fixed to the arms SS21B and SS22B by fasteners 225.

[0177] The eighth sprocket SP208 to the tenth sprocket SP210 are fixed together by fasteners 227. A spacer SS22 is disposed 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 together by fasteners 227. Each of the fasteners 227 includes a spacer 227A. The spacer 227A of the fastener 227 is disposed between the ninth sprocket SP209 and the tenth sprocket SP210.

[0178] The ninth sprocket SP209 and the tenth sprocket SP210 are fixed to each other by fasteners 229. Each of the fasteners 229 includes a spacer 229A. The spacer 229A of the fastener 229 is disposed between the ninth sprocket SP209 and the tenth sprocket SP210.

[0179] The tenth sprocket SP210 and the eleventh sprocket SP211 are fixed to each other by fasteners 231. Each of the fasteners 231 includes a spacer 231A. The spacer 231A of the fasteners 231 is disposed between the tenth sprocket SP210 and the eleventh sprocket SP211. Therefore, the seventh sprockets SP207 to the eleventh sprocket SP211 are integrally coupled by fasteners 225, 227, 229 and 231.

[0180] As shown in Figure 20, 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 sprockets SP201 to eighth sprockets SP208 and ninth sprockets SP309 to eleventh sprockets SP311. Sprockets SP309 to SP311 have a structure substantially the same as that of sprockets SP209 to SP211.

[0181] The seventh sprocket SP207, the eighth sprocket SP208, and the ninth sprocket SP309 are fixed together by fasteners 225. Spacer SS21 is disposed between the seventh sprocket SP207 and the eighth sprocket SP208. Spacer SS22 is disposed between the eighth sprocket SP208 and the ninth sprocket SP309. The seventh sprocket SP207, the eighth sprocket SP208, the ninth sprocket SP309, and spacers SS21 and SS22 are fixed together by fasteners 225. The seventh sprocket SP207, the eighth sprocket SP208, the ninth sprocket SP309, and arms SS21B and SS22B are fixed together by fasteners 225.

[0182] The eighth sprocket SP208 and the ninth sprocket SP309 are fixed together by fastener 327. A spacer SS22 is provided between the eighth sprocket SP208 and the ninth sprocket SP309. The eighth sprocket SP208, the ninth sprocket SP309, and the arm SS22B are fixed together by fastener 327.

[0183] The ninth sprocket SP309 and the tenth sprocket SP310 are fixed to each other by fastener 229. The spacer 229A of the fastener 229 is provided between the ninth sprocket SP309 and the tenth sprocket SP310.

[0184] The tenth sprocket SP310 and the eleventh sprocket SP311 are fixed to each other by fastener 231. Spacer 231A of fastener 231 is provided between the tenth sprocket SP310 and the eleventh sprocket SP311. Therefore, the seventh sprocket SP207 to the eleventh sprocket SP311 are integrally coupled by fasteners 225, 327, 229 and 231.

[0185] As shown in Figure 21, the fastener 231 of the sprocket SP311 and the rear sprocket assembly 310 is omitted from the rear sprocket assembly 410. The seventh sprocket SP207 to the tenth sprocket SP310 are integrally coupled using fasteners 225, 327 and 229.

[0186] In the embodiments illustrated in Figures 6 to 8, the rear sprocket assembly 10 includes a tooth position maintaining member 32. However, as seen in Figures 22 to 25, the tooth position maintaining member 32 may be omitted from the rear sprocket assembly 10 as needed and / or desired.

[0187] As seen in Figure 22, according to one modification of this embodiment, the rear sprocket assembly 510 is configured for mounting to the 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 fourth sprockets SP4 to thirteenth sprockets SP13. That is, the rear sprocket assembly 510 includes a first sprocket SP1. The rear sprocket assembly 510 further includes a second sprocket SP502. A third sprocket SP3 is omitted from the plurality of sprockets SP. A 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.

[0188] The second sprocket SP502 has a structure substantially the same as that of the third sprocket SP3 of the rear sprocket assembly 10. The second sprocket SP502 has a second sprocket outer diameter DM502 that is larger than the outer diameter DM1 of the first sprocket SP1.

[0189] The second sprocket SP502 is adjacent to the first or smallest sprocket SP1 in the axial direction D1, and there is no other sprocket between the adjacent sprocket and the first or smallest sprocket SP1. The second sprocket SP502 can also be referred to as an adjacent sprocket SP502. That is, in the rear sprocket assembly 510, a plurality of rear sprockets SP include an adjacent sprocket SP502. The adjacent sprocket SP502 is adjacent to the smallest sprocket SP1 in the axial direction D1, and there is no other sprocket between the adjacent sprocket SP502 and the smallest sprocket SP1.

[0190] As seen in Figure 23, the rear sprocket assembly 510 includes a locking device 526. The locking device 526 is configured to secure the rear sprocket assembly 510 to the sprocket support body 18 of the rear hub assembly 12 in one of the mounting states in which 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.

[0191] The locking device 526 has a structure substantially the same as that of 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.

[0192] As seen in FIG22, the locking device 526 is configured to attach to the sprocket support body 18 to hold the sprocket carrier 22 and the first sprocket SP1, the second sprocket SP502, the fourth sprocket SP4 and the fifth sprocket SP5 in the axial direction D1 between the locking device 526 and the positioning surface 18C of the sprocket support body 18.

[0193] As shown in Figure 24, 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.

[0194] The first axial inward torque transmission profile SP16 is configured such that, in the mounting state in which the rear sprocket assembly 510 is mounted to the rear hub assembly 12, it engages with the second axial outward torque transmission profile SP26 of the second sprocket SP502 adjacent to the first sprocket SP1 in a torque transmission manner in the axial direction D1, and there is no other sprocket between the first sprocket SP1 and the second sprocket SP502.

[0195] The second sprocket SP502 includes an additional torque transmission profile SP527. The additional torque transmission profile SP527 has a structure substantially the same as the additional torque transmission profile SP38 of the third sprocket SP3 in the first embodiment.

[0196] An additional torque transmission profile SP527 is configured to engage with a plurality of external splines 18A of the sprocket support body 18 in a torque transmission manner. The additional torque transmission profile SP527 and the plurality of external splines 18A define a single circumferential position of the second sprocket SP502 relative to one of the sprocket support bodies 18. Rotational force is transmitted from the first sprocket SP1 to the sprocket support body 18 via the second sprocket SP502.

[0197] As seen in FIG. 23, the locking device 526 for mounting a plurality of rear sprockets SP to a rear hub assembly 12 for 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 substantially the same as that of the first locking member 28 of the first embodiment. The second locking member 530 has a structure substantially the same as that of the second locking member 30 of the first embodiment.

[0198] The first locking member 528 is configured to detachably engage with the sprocket support body 18 of the rear wheel hub assembly 12 in this installed state. The second locking member 530 is configured to detachably engage with the first locking member 528 so as to abut against the first sprocket SP1 in the axial direction D1 in the installed state. In this modification, the first locking member 528 is a separate component from the second locking member 530. However, if needed and / or desired, the first locking member 528 and the second locking member 530 can be integrally configured as a single piece.

[0199] The first locking member 528 is configured to detachably engage 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 both the first sprocket opening SPO13 and the second sprocket opening SPO23 in the installed state.

[0200] As seen in FIG. 23, 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.

[0201] 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.

[0202] The locking device 526 is configured such that the first sprocket SP1 and the locking device 526 are assembled as one unit. In the assembled state, the first sprocket SP1 is positioned in the axial direction D1 between the first thread 28D of the first locking member 528 and at least one radial protrusion 30F of the second locking member 530.

[0203] As illustrated in Figure 6, in the sprocket assembly 10, the large diameter DM5 of the first thread 28D is larger than the second diameter DM21 of the second sprocket opening SPO23. However, in the rear sprocket assembly 510, the large diameter DM5 of the first thread 28D is smaller than the second diameter DM21 of the second sprocket opening SPO23. Therefore, the first locking member 528 can be inserted into the second sprocket opening SPO23 of the second sprocket SP502 after the first locking member 528 and the second locking member 530 are assembled into a unit.

[0204] As seen in Figure 25, 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. The locking device assembly 550 may include a second sprocket SP502, depending on need and / or expectation.

[0205] The locking device 526 is configured such that, in the assembled state and before the rear sprocket assembly 510 is mounted to the rear hub assembly 12, the first sprocket SP1 can slide relative to the locking device 526 in the axial direction D1. The locking device 526 is configured such that, in the assembled state and before the plurality of rear sprockets SP are mounted to one of the rear hub assemblies 12, the adjacent sprocket SP502 can slide relative to the locking device 526 in the axial direction D1 on the first surface 28C and the second surface 30C.

[0206] In this modification, in the assembled state where the first sprocket SP1 and the locking device 526 are assembled as a unit, the first sprocket SP1 can slide in the axial direction D1 between the first thread 28D of the first locking member 528 and at least one radial protrusion 30F of the second locking member 530. In the assembled state, before the rear sprocket assembly 510 is installed into the rear hub assembly 12, the first sprocket SP1 can slide in the axial direction D1 between the first thread 28D of the first locking member 528 and at least one radial protrusion 30F of the second locking member 530. However, if needed and / or desired, the locking device 526 can be configured such that in the assembled state, the smallest sprocket SP1 is stationary relative to the locking device 526 system in the axial direction D1. If needed and / or desired, the locking device 526 can be configured such that in the assembled state, before the installation state, the smallest sprocket SP1 is stationary relative to the locking device 526 system in the axial direction D1. In these embodiments, the locking device 526 is configured to restrict axial movement of the first sprocket SP1 relative to one of the locking devices 526 in both the first axial direction D11 and the second axial direction D12, prior to the installation state, in the assembled state. 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 relative to one of the locking devices 526 in the second axial direction D12. The second axial end 28B of the first locking member 528 contacts the first sprocket SP1 to restrict axial movement of the first sprocket SP1 relative to one of the locking devices 526 in the first axial direction D11.

[0207] As seen in Figure 24, 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 opening SP013 of the first sprocket. 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. Using the first and second tools, the first locking member 528 and the second locking member 530 are rotated relative to each other 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.

[0208] As seen in Figure 25, the additional torque transmission profile SP527 of the second sprocket SP502 engages with a plurality of external splines 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 a 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.

[0209] The first sprocket SP1 moves toward the second sprocket SP502 so that the first axial inward torque transmission profile SP16 engages with the second axial outward torque transmission profile SP26 of the second sprocket SP502. The first sprocket SP1 rotates about the rotation center axis A1 relative to the sprocket support body 18 to adjust the rotational position of the first axial inward torque transmission profile SP16 relative to the rotation center axis A1 in a circumferential direction D2 relative to the second axial outward torque transmission profile SP26 of the second sprocket SP502.

[0210] Using the second tool, the locking device 526 is rotated relative to the sprocket support body 18 about the rotation center axis A1, causing the first external thread 28D of the first locking member 528 to be screwed into the internal thread 18D of the sprocket support body 18. Since the first axial inward torque transmission profile SP16 of the first sprocket SP1 engages with the second axial outward torque transmission profile SP26 of the second sprocket SP502, the locking device 526 maintains the rotational position between the first sprocket SP1 and the second sprocket SP502 relative to the sprocket support body 18 while rotating relative to the sprocket support body 18. When the locking device 526 is tightened using the tool, the first sprocket SP1 and the second sprocket SP502 are held in the axial direction D1 between the radial protrusion 30F and the third sprocket SP3. Therefore, the first sprocket SP1 and the second sprocket SP502 are mounted to the sprocket support body 18 of the rear wheel hub assembly 12 using the locking device 526.

[0211] As needed and / or desired, the rear sprocket assembly 510 may include a tooth position maintaining member 32 of the rear sprocket assembly 10.

[0212] In the rear sprocket assembly 10 or 510, the third thread 30D is configured to engage with the second thread 28E in the assembled state. However, the third axial end 30A of the second locking member 30 or 530 may be attached to the second axial end 28B of the first locking member 28 or 528 in a press-fit manner via other structures such as spline engagement.

[0213] In the sprocket assembly 10 illustrated in Figure 6, the first locking member 28 is a component separate from the second locking member 30. In the sprocket assembly 510 illustrated in Figure 23, the first locking member 528 is a component separate from the second locking member 530. However, as seen in Figure 26 or Figure 27, the locking device 26 or 526 may be a single, one-piece component.

[0214] In the modification shown in FIG26, the first locking member 28 and the second locking member 30 are integrally configured as a single piece. At least one radial protrusion 30F of the locking device 26 can be formed by material deformation. At least one radial protrusion 30F of the locking device 26 is formed by material deformation in a state in which the first sprocket SP1, the second sprocket SP2 and the tooth position maintaining member 32 are arranged radially outward from the first surface 28C and the second surface 30C. For example, at least one radial protrusion 30F of the locking device 26 is formed by stamping in a state in which the first sprocket SP1, the second sprocket SP2 and the tooth position maintaining member 32 are arranged radially outward from the first surface 28C and the second surface 30C.

[0215] In the modification shown in FIG27, the first locking member 528 and the second locking member 530 are integrally configured as a single piece. At least one radial protrusion 30F of the locking device 526 can be formed by material deformation. At least one radial protrusion 30F of the locking device 526 is formed by material deformation in a state in which the first sprocket SP1 is arranged radially outward from the first surface 28C and the second surface 30C. For example, at least one radial protrusion 30F of the locking device 526 is formed by stamping in a state in which the first sprocket SP1 is arranged radially outward from the first surface 28C and the second surface 30C.

[0216] Depending on need and / or expectation, each of the structures of the sprocket assemblies 210, 310 and 410 illustrated in Figures 19 to 21 may be applied to the modification of the sprocket assembly 510, the modification of the sprocket assembly 10 illustrated in Figure 26 and the modification of the sprocket assembly 510 illustrated in Figure 27.

[0217] In this application, as used herein, the term "comprising" and its derivatives are intended to be open-ended terms that specify the presence of stated features, elements, components, groups, integers and / or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and / or steps. This concept also applies to words with similar meanings, such as the terms "have," "include," and their derivatives.

[0218] The terms “member”, “section”, “portion”, “part”, “element”, “body” and “structure”, when used in the singular, can have the dual meaning of a single part or a plural part.

[0219] Ordinal numbers such as “first” and “second” used in this application are merely identifiers and have no other meaning (e.g., a particular order and the like). Furthermore, for example, the term “first element” does not imply the existence of a “second element”, and the term “second element” does not imply the existence of a “first element”.

[0220] As used herein, the term "pair of" may include configurations in which the elements of a pair have the same shape or structure as each other, as well as configurations in which the elements of a pair have different shapes or structures.

[0221] The terms “a (a)” (or “a (an)”), “one or more” and “at least one” are used interchangeably in this document.

[0222] As used in this invention, the phrase “at least one of…” means “one or more” of a selection. As an example, as used in this invention, if the number of selections is 2, the phrase “at least one of…” means “only one single selection” or “both of the two selections”. As another example, as used in this invention, if the number of selections is equal to or greater than 3, the phrase “at least one of…” means “only one single selection” or “any combination of equal to or greater than two selections”. For example, the phrase “at least one of A and B” encompasses (1) A alone, (2) B alone, and (3) both A and B. The phrase “at least one of A, B, and C” encompasses (1) A alone, (2) B alone, (3) C alone, (4) both A and B, (5) both B and C, (6) both A and C, and (7) all A, B, and C. In other words, in this invention, the phrase "at least one of A and B" does not mean "at least one of A and at least one of B".

[0223] Finally, as used herein, degree terms such as “substantially,” “about,” and “approximately” mean a reasonable deviation of one of the modified terms such that the final result is not significantly altered. All numerical values ​​set forth in this application may be interpreted as including terms such as “substantially,” “approximately,” and “approximately.”

[0224] Obviously, in view of the above teachings, numerous modifications and variations of the present invention are possible. Therefore, it should be understood that the present invention may be practiced in ways other than those specifically set forth herein, within the scope of the appended claims. [Simplified Explanation of the Diagram]

[0043] As the invention and its many accompanying advantages are better understood by referring to the following detailed description in conjunction with the accompanying drawings, a more complete understanding of the invention and its many accompanying advantages will be readily obtained.

[0044] Figure 1 is a schematic diagram of a human-powered vehicle including a rear sprocket assembly according to an embodiment.

[0045] Figure 2 is an exploded rear view of the rear sprocket assembly and a rear wheel hub assembly of the human-powered vehicle illustrated in Figure 1.

[0046] Figure 3 is a cross-sectional view of the sprocket assembly and the rear wheel hub assembly after the illustration in Figure 2.

[0047] Figure 4 is a side elevation view of one of the sprockets in the sprocket assembly after the illustration in Figure 2.

[0048] Figure 5 is an elevation view of the other side of one of the sprockets in the sprocket assembly after the illustration in Figure 2.

[0049] Figure 6 is a partial cross-sectional view of the sprocket assembly and the rear wheel hub assembly after the illustration in Figure 2.

[0050] Figure 7 is an exploded perspective view of the locking device assembly of the sprocket assembly after the illustration in Figure 2.

[0051] Figure 8 is another exploded perspective view of the locking device assembly of the sprocket assembly after the illustration in Figure 2.

[0052] Figure 9 is an exploded perspective view of one part of the locking device assembly of the sprocket assembly after the illustration in Figure 2.

[0053] Figure 10 is another exploded perspective view of the locking device assembly of the sprocket assembly after the illustration in Figure 2.

[0054] Figure 11 is a perspective view of one tooth position maintaining member of the locking device assembly illustrated in Figure 7.

[0055] Figure 12 is another perspective view of the tooth position maintaining member of the locking device assembly illustrated in Figure 7.

[0056] Figure 13 is a side elevation view of the locking device assembly illustrated in Figure 7, wherein a locking device is omitted.

[0057] Figure 14 is another sectional view of the sprocket assembly and the rear wheel hub assembly after the illustration in Figure 2.

[0058] Figure 15 is a perspective view of one of the sprockets in the sprocket assembly after the illustration in Figure 2.

[0059] Figure 16 is a cross-sectional view of the sprocket assembly and the rear wheel hub assembly after the illustration in Figure 2, used to show an assembly procedure.

[0060] Figure 17 is a cross-sectional view of the sprocket assembly and the rear wheel hub assembly after the illustration in Figure 2, used to show the assembly procedure.

[0061] Figure 18 is a cross-sectional view of the sprocket assembly and the rear wheel hub assembly after the illustration in Figure 2, used to show the assembly procedure.

[0062] Figure 19 is a perspective sectional view of a modified sprocket assembly.

[0063] Figure 20 is a perspective sectional view of a rear sprocket assembly according to another modification.

[0064] Figure 21 is a perspective sectional view of a rear sprocket assembly according to another modification.

[0065] Figure 22 is a cross-sectional view of one of the rear sprocket assemblies and the rear wheel hub assembly according to another modification.

[0066] Figure 23 is a partial cross-sectional view of the sprocket assembly and the rear wheel hub assembly after the illustration in Figure 22.

[0067] Figure 24 is an exploded perspective view of a part of the locking device assembly of the sprocket assembly after the illustration in Figure 22.

[0068] Figure 25 is a partial sectional view of the sprocket assembly and the rear wheel hub assembly after the illustration in Figure 22.

[0069] Figure 26 is a partial cross-sectional view of a rear sprocket assembly according to another modification of the embodiment illustrated in Figure 3.

[0070] Figure 27 is a partial cross-sectional view of a rear sprocket assembly according to another modification of the embodiment illustrated in Figure 22.

Claims

1. A rear sprocket assembly configured for mounting to a rear wheel hub assembly of a human-powered vehicle, the rear sprocket assembly comprising: A first sprocket, being the smallest sprocket in the rear sprocket assembly, includes: a first sprocket body; a plurality of first sprocket teeth extending radially outward from the first sprocket body in a radial direction relative to a rotational central axis of the rear sprocket assembly; and a first sprocket opening configured to receive a hub axle of the rear wheel hub assembly in an installed state in which the rear sprocket assembly is mounted to a rear wheel hub assembly, the first sprocket opening having a first radial minimum diameter smaller than the outermost diameter of a sprocket support body of the rear wheel hub assembly; and a locking device configured to secure the rear sprocket assembly to the sprocket support body of the rear wheel hub assembly in the installed state, and includes: a first locking member comprising: The device comprises: a first axial end configured to be detachably attached to the sprocket support body of the rear wheel hub assembly in the installed state; a second axial end opposite the first axial end in an axial direction relative to the rotation center axis; and a second locking member comprising: a third axial end 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 as a unit; and a fourth axial end opposite the third axial end in the axial direction and having at least one radial protrusion configured to abut against the first sprocket in the axial direction in the installed state, and the locking device being configured such that, in the assembled state and prior to the installed state, the first sprocket is slidable relative to the locking device in the axial direction.

2. The sprocket assembly following claim 1, wherein the first axial end has a first thread configured to engage with the thread of the sprocket support body disposed to the rear hub assembly in the installed state.

3. The sprocket assembly following claim 2, wherein the second axial end has a second thread and the third axial end has a third thread configured to engage with the second threads of the first locking member in the assembled state.

4. As requested in item 3, the sprocket assembly wherein the first locking member is included on a first surface facing radially outward in the radial direction, the first surface being adjacent to the first threads, the second locking member is included on a second surface facing radially outward in the radial direction, the second surface being adjacent to the third threads, and the first surface being positioned radially outward from the second surface in the assembled state.

5. The sprocket assembly following claim 4, wherein the second surface is disposed between the third thread and the at least one radial protrusion.

6. As claimed in claim 5, in the sprocket assembly wherein the first threads of the first locking member extend radially outward from the first surface in the radial direction, the first threads having a first maximum radial 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 having a maximum radial protrusion diameter, and the first minimum radial diameter of the first sprocket opening is smaller than each of the first maximum radial thread diameter of the first threads and the maximum radial protrusion diameter of the at least one radial protrusion.

7. The sprocket assembly following claim 4, wherein the first sprocket has a first radial minimum portion of one of the first radial minimum diameters defining the opening of the first sprocket, and the first radial minimum portion of the first sprocket is radially outwardly positioned from the second surface in the assembled state.

8. The sprocket assembly following claim 2, wherein in the assembled state, the first sprocket is slidable in the axial direction between the first threads of the first locking member and the at least one radial protrusion of the second locking member.

9. The sprocket assembly following claim 1, wherein the first axial end of the first locking member includes a first tool engagement profile, and the fourth axial end of the second locking member includes a second tool engagement profile.

10. The sprocket assembly following claim 2, wherein the locking device is configured to, in the assembled state, position the first sprocket in the axial direction between the first threads of the first locking member and the at least one radial protrusion of the second locking member.

11. The sprocket assembly following claim 1, wherein the first locking member has an axial contact surface and the axial contact surface is configured to contact the third axial end of the second locking member in the assembled state.

12. A sprocket assembly as claimed in claim 1, wherein 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 facing opposite directions in the axial direction, the first axially inward surface being configured to face the axial center plane of one of the human-powered vehicles in the installed state, the first sprocket including a first axially inward torque transmission profile disposed on the first axially inward surface, and the first axially inward torque transmission profile being configured to engage, in the installed state, in the axial direction, in a torque transmission manner with a second axially outward torque transmission profile of a second sprocket adjacent to the first sprocket, wherein there is no other sprocket between the first sprocket and the second sprocket.

13. The sprocket assembly following 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.

14. A rear sprocket assembly configured for mounting to a rear wheel hub assembly of a human-powered vehicle, the rear sprocket assembly comprising: A first sprocket, being one of the smallest sprockets in the rear sprocket assembly, includes: a first sprocket body; a plurality of first sprocket teeth extending radially outward from the first sprocket body in a radial direction relative to a rotational central axis of the rear sprocket assembly; and a first sprocket opening configured to receive a hub axle of the rear wheel hub assembly in an installed state in which the rear sprocket assembly is mounted to a rear wheel hub assembly, the first sprocket opening having a first radial minimum diameter smaller than the outermost diameter of a sprocket support body of the rear wheel hub assembly; and a locking device configured to secure the rear sprocket assembly to the sprocket support body of the rear wheel hub assembly in the installed state, and includes: An axially inward end has a first thread configured to engage with the thread of the sprocket support body disposed to the rear wheel hub assembly in the installed state, the first thread having a first radial maximum thread diameter; and an axially outward end opposite the axially inward end in the axial direction and having at least one radial protrusion configured to abut against the first sprocket in the axial direction in the installed state, the at least one radial protrusion having a radial maximum protrusion diameter, the first radial minimum diameter of the first sprocket opening being smaller than each of the first radial maximum thread diameter of the first threads and the radial maximum protrusion diameter of the at least one radial protrusion, and the locking device is configured such that, in the assembled state and before the installed state, the first sprocket can slide relative to the locking device in the axial direction, wherein the locking device is a single-piece component.

15. The sprocket assembly following claim 14, wherein the at least one radial protrusion of the locking device is formed by material deformation.

16. A locking device for mounting a plurality of rear sprockets to a rear wheel hub assembly for one of a human-powered vehicles, the locking device comprising: A first locking member includes: a first axial end configured to be detachably attached to a sprocket support body of the rear wheel hub assembly in an installed state in which a plurality of rear sprockets are mounted to one of the rear wheel hub assemblies; a second axial end opposite to the first axial end in an axial direction relative to a rotational center axis of one of the plurality of rear sprockets; and a first surface radially outward in a radial direction relative to the rotational center axis; and a second locking member including: a third axial end configured to be attached to the second axial end of the first locking member in an assembled state in which a minimum sprocket is assembled with the locking device as a unit; a fourth axial end opposite to the third axial end in the axial direction and having at least one radial protrusion; and a second surface 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 against the smallest sprocket among the plurality of rear sprockets in the axial direction in the installed state. The first surface is arranged radially outward from the second surface in the radial direction in the assembled state. The plurality of rear sprockets includes an adjacent sprocket adjacent to the smallest sprocket in the axial direction, and there is no other sprocket between the adjacent sprocket and the smallest sprocket. The locking device is configured such that, in the assembled state and before the installed state, the adjacent sprocket can slide relative to the locking device in the axial direction in a space provided radially outward from the first surface and the second surface.

17. The locking device of claim 16, wherein the locking device is configured such that, in the assembled state, the smallest sprocket is stationary relative to the locking device in the axial direction.

18. The locking device of claim 16, wherein the first axial end has a first thread configured to engage with a threaded thread of a sprocket support body provided to one of the rear wheel hub assemblies in the installed state.

19. The locking device of claim 16, 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.

Images