Wheel hub for human-powered vehicles

Abstract

A wheel hub for a human-powered vehicle is provided, comprising a hub axle, a rotating body, a bearing, an inner retainer, and an outer retainer. The rotating body is rotatably mounted on the hub axle. The bearing rotatably couples the rotating body to the hub axle. The bearing comprises an inner ring, an outer ring, and a plurality of roller elements. The inner ring has an axially facing portion adjacent to an inner abutting portion of the hub axle. The outer ring has an axially facing portion adjacent to an outer abutting portion of the rotating body. The roller elements are disposed between the inner ring and the outer ring. The inner retainer is coupled to the hub axle and abuts the axially facing portion of the inner ring. The outer retainer is coupled to the rotating body and abuts the axially facing portion of the outer ring.

Description

Technical Field

[0001] The present disclosure generally relates to a wheel hub for a human powered vehicle. Background Art

[0002] Some wheels for human-powered vehicles (e.g., bicycles) include a hub, a plurality of spokes, and an annular rim. The hub has a hub axle that is non-rotatably mounted to the frame of the human-powered vehicle. The hub has a hub shell that is coaxially coupled to the hub axle, such that the hub shell is positioned radially outward relative to the hub axle. Bearings are constructed and arranged to support the hub shell so that it can rotate freely about the hub axle. In almost all types of bicycles, except for fixed-gear and track-racing bicycles, a bicycle wheel, typically the rear wheel, is provided with a bicycle freewheel disposed on the wheel hub. Bicycle freewheels typically have a one-way clutch function, thereby transmitting torque in only one direction. Therefore, the use of a flywheel allows the bicycle to move forward freely without any pedal rotation (i.e., during coasting). During coasting, the bicycle flywheel is considered to be in a freewheeling state, in which the bicycle wheel is able to rotate freely while the sprocket remains stationary. Summary of the Invention

[0003] Generally, the present disclosure relates to various features of a wheel hub for a human-powered vehicle. As used herein, the term "human-powered vehicle" refers to a vehicle that can be driven at least by human driving force, but does not include vehicles that use only a driving force other than human power. In particular, vehicles that use only an internal combustion engine as a driving force are not included in human-powered vehicles. It is generally assumed that human-powered vehicles are compact, lightweight vehicles that sometimes do not require a license for driving on public roads. The number of wheels on a human-powered vehicle is not limited. Human-powered vehicles include, for example, unicycles and vehicles with three or more wheels. Human-powered vehicles include, for example, various types of bicycles, such as mountain bikes, road bikes, city bikes, cargo bikes, recumbent bikes, and electric-assisted bicycles (e-bikes).

[0004] In view of the current state of the art and in accordance with a first aspect of the present disclosure, a wheel hub for a human-powered vehicle is provided, the wheel hub comprising a hub axle, a rotating body, a first bearing, an inner retainer, and an outer retainer. The hub axle includes a first inner abutment. The hub axle defines an axis of rotation. The rotating body is rotatably mounted on the hub axle for rotation about the axis of rotation. The rotating body includes a first outer abutment. A first bearing is disposed radially between the hub axle and the rotating body to rotatably couple the rotating body to the hub axle. The first bearing includes a first inner ring, a first outer ring, and a plurality of first roller elements. The first inner ring has a first axially facing portion abutting the first inner abutment of the hub axle. The first outer ring has a first axially facing portion abutting the first outer abutment of the rotating body. The first roller elements are disposed between the first inner ring and the first outer ring. The inner retainer is coupled to the hub axle and abuts the second axially facing portion of the first inner ring of the first bearing. The outer retainer is coupled to the rotating body and abuts the second axially facing portion of the first outer ring of the first bearing.

[0005] With the hub according to the first aspect, the axial position of the rotating body relative to the hub shaft can be set without using a spacer.

[0006] According to a second aspect of the present disclosure, the hub according to the first aspect is configured so that the inner retainer is adjustably coupled to the hub shaft in an axial direction relative to the rotation axis.

[0007] With the hub according to the second aspect, the axial position of the first bearing relative to the hub shaft can be easily set.

[0008] According to a third aspect of the present disclosure, the hub according to the first aspect or the second aspect is configured so that the inner retainer has an internal thread that is threadably engaged with the external thread of the hub axle.

[0009] With the hub according to the third aspect, the axial position of the first bearing relative to the hub axle can be easily set by simply screwing the inner retainer onto the hub axle.

[0010] According to a fourth aspect of the present disclosure, the hub according to any one of the first to third aspects is configured so that the outer holder is adjustably coupled to the rotating body in an axial direction relative to the rotation axis.

[0011] With the hub according to the fourth aspect, the axial position of the first bearing relative to the rotating body can be easily set.

[0012] According to a fifth aspect of the present disclosure, the hub according to any one of the first to fourth aspects is configured so that the outer retainer has an outer thread that is threadably engaged with the inner thread of the rotating body.

[0013] With the hub according to the fifth aspect, the axial position of the first bearing relative to the rotating body can be set by simply screwing the outer retainer into the rotating body.

[0014] According to a sixth aspect of the present disclosure, the hub according to any one of the first to fifth aspects is configured so that the hub axle includes a hollow body.

[0015] With the wheel hub according to the sixth aspect, the overall weight of the wheel hub can be reduced and / or the hub axle can be configured to receive a vehicle frame fixing device.

[0016] According to a seventh aspect of the present disclosure, the hub according to any one of the first to sixth aspects is configured so that the first inner abutment portion is integrally formed on the outer surface of the hub axle as a component of the hub axle.

[0017] With the hub according to the seventh aspect, the structure of the hub shaft can be simplified.

[0018] According to an eighth aspect of the present disclosure, the hub according to any one of the first to seventh aspects is configured so that the first outer abutment portion is integrally formed on the inner surface of the rotating body as a component of the rotating body.

[0019] With the hub according to the eighth aspect, the structure of the rotating body can be simplified.

[0020] According to a ninth aspect of the present disclosure, the wheel hub according to any one of the first to eighth aspects further includes a second bearing disposed between the wheel hub shaft and the rotating body in a radial direction relative to the axis of rotation to rotatably couple the rotating body to the wheel hub shaft. The second bearing includes a second inner ring, a second outer ring, and a plurality of second roller elements. The second inner ring has a third axially facing portion that faces the second inner abutting portion of the wheel hub shaft. The second outer ring has a third axially facing portion that faces the second outer abutting portion of the rotating body. The second roller elements are disposed between the second inner ring and the second outer ring.

[0021] With the hub according to the ninth aspect, the rotating body is reliably supported on the hub axle so as to rotate relative to the hub axle.

[0022] In accordance with a tenth aspect of the present disclosure, the hub according to the ninth aspect is configured so that at least one of the second inner abutment portion of the hub shaft and the second outer abutment portion of the rotating body is axially spaced apart from the second bearing.

[0023] With the hub according to the tenth aspect, the second bearing can be press-fitted onto one of the hub shaft and the rotating body to axially position the second bearing. In addition, the second bearing is less susceptible to axial force.

[0024] According to the eleventh aspect of the present disclosure, the hub according to the ninth aspect or the tenth aspect is constructed so that the outermost point of the first inner adjacent portion of the hub shaft is radially spaced apart from the axis of rotation by a first radial distance, and the innermost point of the second inner adjacent portion of the hub shaft is radially spaced apart from the axis of rotation by a second radial distance, and the second radial distance is greater than the first radial distance.

[0025] With the hub according to the eleventh aspect, the second bearing can be dimensioned such that the second bearing passes over the first inner abutment of the hub axle during assembly of the hub.

[0026] According to the twelfth aspect of the present disclosure, the hub according to any one of aspects 9 to eleven is constructed so that the innermost point of the first outer adjacent portion of the rotating body is radially spaced apart from the axis of rotation by a third radial distance, and the innermost point of the second outer adjacent portion of the rotating body is radially spaced apart from the axis of rotation by a fourth radial distance, and the fourth radial distance is greater than the third radial distance.

[0027] With the hub according to the twelfth aspect, the first bearing can be smaller in diameter than the second bearing. In addition, the second bearing can be easily attached to the hub axle.

[0028] In accordance with a thirteenth aspect of the present disclosure, the hub according to the twelfth aspect is configured such that the outermost point of the first inner abutment portion of the hub shaft is radially spaced a first radial distance from the rotation axis, and the fourth radial distance is greater than the first radial distance.

[0029] With the hub according to the thirteenth aspect, the second outer abutment portion of the rotating body and the first inner abutment portion of the hub shaft can pass through each other during assembly of the hub.

[0030] According to a fourteenth aspect of the present disclosure, the hub according to any one of the ninth to thirteenth aspects is configured so that the second inner abutment portion is integrally formed on the outer surface of the hub axle as an integral part of the hub axle.

[0031] With the hub according to the fourteenth aspect, the structure of the hub shaft can be simplified.

[0032] According to a fifteenth aspect of the present disclosure, the hub according to any one of the ninth to fourteenth aspects is configured so that the second outer abutment portion is integrally formed on the inner surface of the rotating body as a component of the rotating body.

[0033] With the hub according to the fifteenth aspect, the structure of the rotating body can be simplified.

[0034] According to a sixteenth aspect of the present disclosure, the hub according to any one of the first to fifteenth aspects is configured so that the rotating body includes a sprocket support.

[0035] With the hub according to the sixteenth aspect, the sprocket can be mounted to the hub to drive the hub.

[0036] According to a seventeenth aspect of the present disclosure, the wheel hub according to any one of the first to sixteenth aspects further includes a hub shell rotatably mounted on the hub axle for rotation about a rotation axis. A rotating body is coupled to the hub shell for rotation therewith about the rotation axis in a driving rotational direction. The rotating body is configured to rotate relative to the hub shell about the rotation axis in a non-driving rotational direction.

[0037] With the hub according to the seventeenth aspect, the rotating body functions as a flywheel with respect to the hub shell rotatably supported on the hub axle.

[0038] According to an eighteenth aspect of the present disclosure, the hub according to any one of the first to fifteenth aspects is configured so that the rotating body includes the spoke attachment structure.

[0039] With the hub according to the eighteenth aspect, the rotating body serves as the hub shell rotatably supported on the hub axle.

[0040] Furthermore, other objects, features, aspects and advantages of the disclosed hub will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the accompanying drawings, discloses preferred embodiments of the hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Reference is now made to the accompanying drawings which form a part of this original disclosure:

[0042] Figure 1 is a side elevational view of a human-powered vehicle (e.g., a bicycle) equipped with a pair of wheels according to one embodiment;

[0043] Figure 2 yes Figure 1 a perspective view of the hub of the rear wheel of the illustrated human-powered vehicle;

[0044] Figure 3 yes Figure 2 A longitudinal section of the wheel hub is shown with the frame fixings omitted;

[0045] Figure 4 yes Figure 3 an enlarged cross-sectional view of a portion of the wheel hub, showing first and second ratchet members of the planar ratchet assembly in an engaged position to drive a hub body of the wheel hub;

[0046] Figure 5 yes Figure 4 an enlarged cross-sectional view of a portion of the hub shown, illustrating the first and second ratchet members in a disengaged position for sliding;

[0047] Figure 6 yes Figure 2 a longitudinal cross-sectional view of a selected portion of the hub, showing the flywheel of the hub rotatably supported on a hub axle of the hub by a first bearing and a second bearing;

[0048] Figure 7 yes Figure 6 a longitudinal cross-sectional view of a first portion of the hub illustrating a first bearing rotatably supporting a first end of the flywheel on the hub axle;

[0049] Figure 8 yes Figure 6 a longitudinal cross-sectional view of a second portion of the hub, illustrating a second bearing rotatably supporting a second end of the flywheel on the hub axle; and

[0050] Figure 9 yes Figure 1 A longitudinal section through the hub of the front wheel of a human-powered vehicle is shown. DETAILED DESCRIPTION

[0051] Selected embodiments will now be described with reference to the accompanying drawings. From this disclosure, it will be apparent to those skilled in the art of human-powered vehicles (e.g., bicycles) that the following description of these embodiments is provided for illustration only and not for limiting the invention as defined by the appended claims and their equivalents.

[0052] First reference Figure 1 , shows a human-powered vehicle V equipped with a pair of wheel hubs 10A and 10B according to one illustrated embodiment. In this embodiment, the human-powered vehicle V is a bicycle, and the wheel hubs 10A and 10B are bicycle wheel hubs. The human-powered vehicle V includes a front wheel FW and a rear wheel RW rotatably attached to a vehicle body VB. Here, the wheel hub 10A is provided on the rear wheel RW, and the wheel hub 10B is provided on the front wheel FW. The vehicle body VB is also provided with a handlebar H and a front fork FF for steering the front wheel FW. The vehicle body VB is also provided with a seat S for a rider to sit on when riding the human-powered vehicle V.

[0053] like Figure 1As shown, the human-powered vehicle V also includes a drive assembly 12. The drive assembly 12 includes a wheel hub 10A. Here, for example, the drive assembly 12 is a chain-driven type. The drive assembly 12 also includes a crank 14, a chain 16 (i.e., a force transmission member), a plurality of front sprockets 18 (i.e., a front rotatable body), and a plurality of rear sprockets 20 (i.e., a rear rotatable body). The chain 16 provides mechanical communication between the crank 14 and the wheel hub 10A. Therefore, the rotational force caused by the rotation of the crank 14 in the forward travel direction R can be transmitted to the wheel hub 10A via the chain 16. The crank 14 includes a crank axle 14A and a pair of crank arms 14B. The pedal PD is rotatably coupled to the distal end of each crank arm 14B. The crank arms 14B are disposed on opposite ends of the crank axle 14A. The chain 16 can provide a mechanical connection between the front sprocket 18 and the rear sprocket 20 disposed on the wheel hub 10A.

[0054] Here, the human-powered vehicle V also includes a front derailleur FD, which is attached to the vehicle body VB and is used to shift the chain 16 between the front sprockets 18 provided on the crank 14. Furthermore, here, the human-powered vehicle V also includes a rear derailleur RD, which is attached to the rear portion of the vehicle body VB and is used to shift the chain 16 between the rear sprockets 20 provided on the wheel hub 10. The front derailleur FD and the rear derailleur RD are a type of shifting device. Here, for example, the front derailleur FD and the rear derailleur RD are electric derailleurs (i.e., electric shifting devices). The front derailleur FD and the rear derailleur RD are operated when the rider of the human-powered vehicle V manually operates the shift operating device or shifter SL. The front derailleur FD and the rear derailleur RD can also be automatically operated based on the driving conditions and / or operating conditions of the human-powered vehicle V.

[0055] Special reference will now be made to Figure 2 and Figure 3 The structure of the hub 10A is described. The hub 10A basically includes a hub axle 30, a hub shell 32, and a sprocket support 34. The hub shell 32 and the sprocket support 34 are each an example of a rotating body. In other words, the hub 10A includes a hub axle (e.g., the hub axle 30) and a rotating body (e.g., the sprocket support 34). The hub axle 30 defines an axis of rotation CA. The hub 10A also includes a hub shell (e.g., the hub shell 32) rotatably mounted on the hub axle 30 so as to rotate about the axis of rotation CA. The hub shell 32 and the sprocket support 34 are rotatably mounted on the hub axle 30 so as to rotate about the axis of rotation CA. Therefore, in the hub 10A, the rotating body includes the sprocket support 34. In other words, the rotating body (e.g., the sprocket support 34) is rotatably mounted on the hub axle 30 so as to rotate about the axis of rotation CA.

[0056] The sprocket support 34 is rotatably coupled to the hub axle 30 so as to transmit the driving force from the sprocket support 34 to the hub shell 32 while the sprocket support 34 rotates in the driving direction D1, as will be described later. Basically, the hub axle 30 is non-rotatably attached to the vehicle body VB, and the hub shell 32 is rotatably mounted around the hub axle 30. Figure 1 As shown, the hub shell 32 rotates relative to the hub axle 30 in a driving direction D1 corresponding to the forward travel direction R of the rear wheel RW. The sprocket support 34 is configured to support the rear sprocket 20.

[0057] The sprocket support 34 constitutes a driving member having a tubular shape. The sprocket support 34 is rotatably mounted on the hub axle 30 so as to rotate about the rotation axis CA. The sprocket support 34 has an outer peripheral surface provided with a plurality of axially extending splines 35 ( Figure 2 ), for non-rotatably engaging the rear sprocket 20 ( Figure 1 The splines 35 are parallel to each other and extend parallel to the rotation axis CA. The rear sprocket 20 ( Figure 1 ) is retained on the sprocket support 34 in a conventional manner, such as by a conventional nut threaded into the sprocket support 34.

[0058] like Figure 2 As shown, a frame fixing device 36 is provided for attaching the hub 10A to a bicycle frame F in a conventional manner (see FIG. Figure 1 ). In the first illustrated embodiment, the frame securing means 36 comprises a rod or spindle 36a having a cam lever mechanism 36b mounted on one end of the spindle 36a. Thus, as Figure 1 As shown, the wheel hub 10 can be mounted on the rear portion of the vehicle body VB of the human-powered vehicle V.

[0059] like Figure 3 As shown, the hub shell 32 is rotatably mounted on the hub axle 30 for rotation about the rotation axis CA. The hub shell 32 is a rigid member made of a suitable material, such as a metal material or a reinforced plastic material. The hub shell 32 has a central tubular body 32a and a pair of spoke attachment flanges 32b and 32c extending radially outward from the central tubular body 32a. The spoke attachment flanges 32b and 32c are configured to receive the inner ends of the spokes of the rear wheel in a conventional manner.

[0060] like Figure 3As shown, the hub axle 30 is a rigid member having a first end 30a and a second end 30b. Here, the hub axle 30 includes a hollow body 30c. The hollow body 30c is configured to receive a spindle 36a therethrough. The hub 10A also includes at least one bearing assembly for rotatably supporting the hub shell 32 on the hub axle 30. In the illustrated embodiment, the hub shell 32 is rotatably mounted on the hub axle 30 via a first bearing 38A and a second bearing 38B. The first bearing 38A is positioned at the first end 30a of the hub axle 30, while the second bearing 38B is adjacent to the second end 30b of the hub axle 30. The first bearing 38A is axially spaced from the second bearing 38B relative to an axial direction Y parallel to the rotation axis CA. The first bearing 38A is closer to the first end 30a than the second bearing 38B. The second bearing 38B is closer to the second end 30b than the first bearing 38A. The second bearing 38B is closer to the sprocket support 34 than the first bearing 38A. Here, the first bearing 38A and the second bearing 38B are angular contact ball bearings. The first bearing 38A and the second bearing 38B are conventional bearings well known in the bicycle field, and therefore, the first bearing 38A and the second bearing 38B will not be discussed or shown in detail here. Moreover, as needed and / or desired, other bearing arrangements can be used to rotatably support the hub shell 32 on the hub axle 30. The first bearing 38A and the second bearing 38B are angular contact ball bearings. Angular contact ball bearings are generally more resistant to axial forces than radial ball bearings. In this specification, the radial ball bearings are deep groove radial ball bearings.

[0061] The hub 10A also includes a retainer 40 that is screwed onto the first end 30a of the hub axle 30. When the retainer 40 is screwed onto the first end 30a of the hub axle 30, an axial force is applied to the first bearing 38A to push the first bearing 38A against the first inner abutment 32d of the hub shell 32. Therefore, the axial position of the first bearing 38A is set by the retainer 40. Moreover, when the retainer 40 is screwed onto the first end 30a of the hub axle 30, the hub axle 30 applies an axial force to the second bearing 38B to push the second bearing 38B against the second inner abutment 32e of the hub shell 32. The first inner abutment 32d faces opposite axial directions to the second inner abutment 32e. In this way, the axial movement of the hub shell 32 relative to the hub axle 30 is restricted. The end cap 41 is also screwed onto the first end portion 30a of the hub axle 30 so that the retainer 40 and the end cap 41 can be tightened together to lock the retainer 40 in place on the hub axle 30. Figure 3As shown, the first inner abutment 32d is axially spaced apart from the second inner abutment 32e relative to the axial direction Y parallel to the rotation axis CA. The first inner abutment 32d is located proximate to the spoke attachment flange 32b, while the second inner abutment 32e is located proximate to the spoke attachment flange 32c. Therefore, relative to the axial direction Y parallel to the rotation axis CA, the first inner abutment 32d is located closer to the first end 30a of the hub axle 30 than the second inner abutment 32e. Furthermore, here, the first inner abutment 32d and the second inner abutment 32e are located substantially the same distance from the rotation axis CA of the hub axle 30 relative to the radial direction X perpendicular to the rotation axis CA. With respect to the axial direction Y, the first inner abutment 32d faces in an opposite direction from the second inner abutment 32e. The first inner abutment 32d faces the first end 30a of the hub axle 30. The second inner abutment 32e faces the second end 30b of the hub axle 30.

[0062] Moreover, if Figure 3 As shown, the hub 10A further includes at least one bearing for rotatably supporting the sprocket support member 34 on the hub axle 30. The hub 10A also includes a first bearing 42. Depending on the configuration of the sprocket support member 34 and the first bearing 42, the hub 10A may include only the first bearing 42 for rotatably supporting the sprocket support member 34 on the hub axle 30. In any case, the first bearing 42 is disposed between the hub axle 30 and the sprocket support member 34 (i.e., the rotating body) in the radial direction X relative to the rotation axis CA to rotatably couple the rotating body to the hub axle 30. The first bearing 42 includes a first inner ring 42a, a first outer ring 42b, and a plurality of first roller elements 42c. The first roller elements 42c are disposed between the first inner ring 42a and the first outer ring 42b.

[0063] In the illustrated embodiment, the hub 10A further includes a second bearing 43. In this case, the second bearing 43 is disposed between the hub axle 30 and the sprocket support 34 (i.e., the rotating body) in a radial direction X relative to the rotation axis CA to rotatably couple the rotating body to the hub axle 30. The second bearing 43 includes a second inner race 43a, a second outer race 43b, and a plurality of second roller elements 43c. The second roller elements 43c are disposed between the second inner race 43a and the second outer race 43b. The first bearing 42 and the second bearing 43 are radial ball bearings. The first bearing 42 is axially spaced apart from the second bearing 43 relative to an axial direction Y parallel to the rotation axis CA. The first bearing 42 is closer to the second end 30b than the second bearing 43. The second bearing 43 is closer to the first end 30a than the first bearing 42. The second bearing 43 is closer to the hub shell 32 than the first bearing 42.

[0064] like Figure 3As shown, the hub 10A includes an inner retainer 44 and an outer retainer 46. The inner retainer 44 and the outer retainer 46 are configured to retain the sprocket support 34 on the hub axle 30 and axially position the first bearing 42 and the sprocket support 34 relative to the hub axle 30. Figure 2 ), the sprocket support 34 (i.e., the rotating body) transmits the rotation to the hub shell 32, so that the sprocket support 34 rotates together with the hub shell 32. In other words, the sprocket support 34 (i.e., the rotating body) is coupled to the hub shell 32 to rotate together in the driving rotation direction D1 around the rotation axis CA. However, when the sprocket support 34 rotates in the non-driving direction D2 (see FIG. Figure 2 ), the rotation of the sprocket support 34 (i.e., the rotating body) is not transmitted to the hub shell 32. Therefore, the sprocket support 34 (i.e., the rotating body) is configured to rotate in the non-driven rotation direction D2 about the rotation axis CA relative to the hub shell 32. In particular, the hub 10A also includes a flat ratchet assembly 50 to transmit the rotation from the sprocket support 34 to the hub shell 32 when the sprocket support 34 rotates in the driving direction D1, but not to transmit the rotation from the sprocket support 34 to the hub shell 32 when the sprocket support 34 rotates in the non-driven direction D2. The flat ratchet assembly 50 is disposed radially outward from the second bearing 43. The flat ratchet assembly 50 can be disposed radially outward from the second bearing 38B. Therefore, the second bearing 43 can be disposed close to the second bearing 38B with respect to the axial direction Y parallel to the rotation axis CA. Therefore, the axial length of the hub 10A can be reduced. The distance between the first bearing 42 and the second bearing 43 can be increased. Therefore, the sprocket support 34 is stably held by the first bearing 42 and the second bearing 43. The distance between the first bearing 38A and the second bearing 38B can be increased. Therefore, the hub shell 32 is stably held by the first bearing 38A and the second bearing 38B.

[0065] The flat ratchet assembly 50 functions as a one-way clutch between the hub shell 32 and the sprocket support 34 to allow the sprocket support 34 to slip or spin relative to the hub shell 32. Specifically, slip or spin occurs when the sprocket support 34 is prevented from rotating in the drive direction D1 (i.e., clockwise about the rotation axis CA as viewed from the freewheel side of the hub 10A) by the chain 16 while the hub shell 32 rotates in the forward travel direction R. Additionally, slip or spin occurs when the hub shell 32 rotates faster in the forward travel direction R than the sprocket support 34 is rotated by the chain 16 in the drive direction D1. Furthermore, slip or spin also occurs when the sprocket support 34 is rotated in the non-drive direction D2 by the chain 16 due to the rider pedaling backward. While the flat face ratchet assembly 50 is shown as transmitting rotation from the sprocket support 34 to the hub shell 32 in the drive direction D1 rather than the non-drive direction D2, it will be apparent from this disclosure that other types of structures may be used in place of the flat face ratchet assembly 50. For example, a pawl-type one-way clutch, such as that disclosed in U.S. Patent No. 6,202,813 (assigned to Shimano Corporation), may be used.

[0066] refer to Figure 4 and Figure 5 The planar ratchet assembly 50 basically includes a first ratchet member 51 and a second ratchet member 52. The planar ratchet assembly 50 also includes a biasing element 53. Figure 4 and Figure 5 As shown, the biasing element 53 is disposed between the hub shell 32 and the second ratchet member 52. The biasing element 53 biases the second ratchet member 52 toward the first ratchet member 51 in the first axial direction A1 into the engaged position. Here, the first axial direction A1 refers to a direction parallel to the rotation axis CA of the hub axle 30 and points in the direction toward the second end 30b of the hub axle 30 having the sprocket support 34. Preferably, the biasing element 53 is configured to rotate together with the hub shell 32. In the illustrated embodiment, the biasing element 53 has a protrusion disposed in a recess of the hub shell 32 so that the biasing element 53 rotates together with the hub shell 32. When the sprocket support 34 is in a stationary position (i.e., no torque is applied), the biasing element 53 maintains the second ratchet member 52 in driving engagement with the first ratchet member 51. The biasing element 53 includes, for example, a compression spring and a friction member 54 in the illustrated embodiment. In other words, in the illustrated embodiment, the friction member 54 is provided as a separate piece fixed to the end of the compression spring of the biasing element 53 facing the second ratchet member 52. Alternatively, the friction member 54 may be omitted so that the end coil of the biasing element 53 forms the friction member.

[0067] The first ratchet member 51 and the second ratchet member 52 move relative to each other in the axial direction. Figure 5In particular, the second ratchet member 52 is biased into the engagement position in the first axial direction A1 toward the first ratchet member 51 by the biasing element 53, as shown in FIG. Figure 4 As shown. During coasting, the sprocket support 34 stops rotating in the driving direction D1, and the hub shell 32 continues to rotate in the forward travel direction R. Since the sprocket support 34 stops rotating in the driving direction D1, the second ratchet member 52 overcomes the force of the biasing element 53 and moves away from the first ratchet member 51 in the second axial direction A2. Here, the second axial direction A2 refers to a direction parallel to the rotation axis CA of the hub axle 30, and points in a direction away from the second end 30b of the hub axle 30 having the sprocket support 34. In this way, the first ratchet member 51 and the second ratchet member 52 can slide relative to each other in the axial direction with respect to the rotation axis CA, as shown in FIG. Figure 5 shown.

[0068] like Figure 4 and Figure 5 As shown, a dust cover 56 is provided to cover the annular gap between the sprocket support 34 and the hub shell 32. A support and retaining assembly holds the dust cover 56 on the hub shell 32. The support and retaining assembly includes an outer cover 58 and a retaining ring or clamp 60. The outer cover 58 is disposed between the sprocket support 34 and the hub shell 32. The retaining ring or clamp 60 is disposed in a recess of the sprocket support 34 to retain the retaining ring 60 on the sprocket support 34 and to limit outward axial movement of the outer cover 58. The hub 10A also includes a circumferential gasket 62 and an axial gasket 64. The circumferential gasket 62 is disposed between the hub shell 32 and the first ratchet member 51 to occupy the circumferential space between the first ratchet member 51 and the hub shell 32. The axial gasket 64 is disposed between the sprocket support 34 and the first ratchet member 51 to occupy the axial space between the sprocket support 34 and the first ratchet member 51.

[0069] Now refer to Figures 6 and 7 The rotatable connection between the hub axle 30 and the sprocket support member 34 (i.e., the rotating body) will now be discussed in more detail. As described above, in the illustrated embodiment, the sprocket support member 34 (i.e., the rotating body) is rotatably supported on the hub axle 30 via the first bearing 42 and the second bearing 43.

[0070] The inner retainer 44 and the outer retainer 46 are configured to axially position the first bearing 42 between the hub axle 30 and the sprocket support 34. Specifically, the hub axle 30 includes a first inner abutment portion 30d, and the sprocket support 34 (i.e., the rotating body) includes a first outer abutment portion 34a. On the other hand, the first inner race 42a has a first axially facing portion 42a1 that abuts the first inner abutment portion 30d of the hub axle 30, and the first outer race 42b has a first axially facing portion 42b1 that abuts the first outer abutment portion 34a of the rotating body. This restricts axial movement of the first bearing 42 toward the hub shell 32.

[0071] The axial movement of the first bearing 42 in a direction away from the hub shell 32 is limited by the inner retainer 44. Here, the inner retainer 44 is adjustably coupled to the hub axle 30 in the axial direction Y relative to the rotation axis CA. Specifically, the inner retainer 44 has an internal thread 44a that threadedly engages with the external thread 30b1 of the hub axle 30. The inner retainer 44 is coupled to the hub axle 30 and abuts the second axial facing portion 42a2 of the first inner ring 42a of the first bearing 42. The inner retainer 44 has an axial facing surface 44c that abuts the second axial facing portion 42a2 of the first inner ring 42a of the first bearing 42.

[0072] In this way, the inner retainer 44 can adjust the force holding the first inner race 42a in the axial direction Y relative to the rotation axis CA. The inner retainer 44 has an axially facing surface 44b spaced apart from the second end 30b of the hub axle 30. This reliably prevents the inner retainer 44 from moving along the hub axle 30 in the axial direction Y. Furthermore, here, the outer retainer 46 is adjustably coupled to the sprocket support 34 (i.e., the rotating body) in the axial direction Y relative to the rotation axis CA. Specifically, the outer retainer 46 has external threads 46a that threadably engage with the internal threads 34c of the sprocket support 34 (i.e., the rotating body). The outer retainer 46 is coupled to the rotating body and abuts the second axially facing portion 42b2 of the first outer race 42b of the first bearing 42. The outer retainer 46 has an axially facing surface 46b that abuts the second axially facing portion 42b2 of the first outer race 42b of the first bearing 42. In this way, the outer retainer 46 can adjust the force of retaining the first outer race 42 b in the axial direction Y with respect to the rotation axis CA.

[0073] As described above, the inner retainer 44 includes an axial facing surface 44b and an axial facing surface 44c. When the inner retainer 44 is threaded onto the second end 30b of the hub axle 30 and the outer retainer 46 is threaded into the sprocket support 34, the axial facing surface 44b and the axial facing surface 46b of the inner retainer 44 are axially aligned with respect to the axial direction Y. On the other hand, the axial facing surface 44b is axially spaced apart from the axial facing surface 44c relative to the axial direction Y, so that the axial facing surface 44b is axially spaced apart from the second end 30b of the hub axle 30. Each of the axial facing surface 44b, the axial facing surface 44c, and the axial facing surface 46b faces the first end 30a of the hub axle 30. The outer retainer 46 is arranged at the end of the sprocket support 34 on the side located in the first axial direction A1.

[0074] In the embodiment shown, Figure 8 As shown, the second bearing 43 is press-fitted into the sprocket support 34 (i.e., the rotating body). Alternatively, the second bearing 43 is press-fitted into the hub axle 30. Here, the second inner race 43a has a third axially facing portion 43a1 that faces the second inner abutment portion 30e of the hub axle 30, and the second outer race 43b has a third axially facing portion 43b1 that faces the second outer abutment portion 34b of the sprocket support 34 (i.e., the rotating body). Here, the second inner race 43a also has a fourth axially facing portion 43a2 that faces the opposite direction from the third axially facing portion 43a1 with respect to the axial direction Y. Furthermore, the second outer race 43b also has a fourth axially facing portion 43b2 that faces the opposite direction from the third axially facing portion 43b1 with respect to the axial direction Y. The third axially facing portion 43a1 and the fourth axially facing portion 43b2 are axially aligned with respect to the axial direction Y. Furthermore, the third axially facing portion 43b1 and the fourth axially facing portion 43a2 are axially aligned with respect to the axial direction Y. Each of the third axially facing portion 43a1 and the fourth axially facing portion 43b2 faces the first end 30a of the hub axle 30. Each of the fourth axially facing portion 43a2 and the third axially facing portion 43b1 faces the second end 30b of the hub axle 30. The fourth axially facing portion 43a2 is closer to the second end 30b of the hub axle 30 than the third axially facing portion 43a1. The third axially facing portion 43b1 is closer to the second end 30b of the hub axle 30 than the fourth axially facing portion 43b2.

[0075] With this arrangement, the second outer abutment 34b abuts and contacts the third axially facing portion 43b1. Therefore, axial movement of the second bearing 43 in a direction away from the hub shell 32 is restricted by the second outer abutment 34b of the sprocket support 34. On the other hand, axial movement of the second bearing 43 in a direction toward the hub shell 32 is permitted because the second inner abutment 30e of the hub axle 30 is axially spaced from the second inner ring 43a, and the sprocket support 34 does not include any structure that restricts axial movement of the second outer ring 43b in a direction toward the hub shell 32.

[0076] Alternatively, the third axially facing portion 43a1 may abut and contact the second inner abutment 30e. On the other hand, the second outer abutment 34b of the sprocket support 34 may be axially spaced apart from the second outer ring 43b. Therefore, the hub axle 30 and the sprocket support 34 (i.e., the rotating body) may be configured so that the axial movement of the second bearing 43 in the direction toward the hub shell 32 is restricted by the second inner abutment 30e of the hub axle 30, while allowing the second bearing 43 to move axially away from the hub shell 32. In other words, preferably, at least one of the second inner abutment 30e of the hub axle 30 and the second outer abutment 34b of the sprocket support 34 (i.e., the rotating body) is axially spaced apart from the second bearing 43. Alternatively, the hub axle 30 and the sprocket support 34 (i.e., the rotating body) may be configured so that the axial movement of the second bearing 43 is not restricted in either axial direction. In this case, for example, the second bearing 43 is clearance-fitted with respect to both the hub shaft 30 and the sprocket support 34 .

[0077] As mentioned above, Figure 6 As shown, the hub axle 30 includes a first inner abutment portion 30d and a second inner abutment portion 30e, while the support member 34 includes a first outer abutment portion 34a and a second outer abutment portion 34b. The first inner abutment portion 30d and the second inner abutment portion 30e are axially aligned with respect to the axial direction Y. On the other hand, the second inner abutment portion 30e and the second outer abutment portion 34b are axially offset with respect to the axial direction Y. The first inner abutment portion 30d and the first outer abutment portion 34a are closer to the second end 30b of the hub axle 30 than the second inner abutment portion 30e and the second outer abutment portion 34b with respect to the axial direction Y. The second inner abutment portion 30e and the second outer abutment portion 34b are located on opposite axial sides of the second bearing 43 with respect to the axial direction Y. The second inner abutment portion 30e is closer to the first end 30a of the hub axle 30 with respect to the axial direction Y than the second outer abutment portion 34b. Each of the first inner abutment portion 30d and the first outer abutment portion 34a faces the second end 30b of the hub axle 30. The second inner abutment portion 30e faces the second end portion 30b of the hub axle 30. The second outer abutment portion 34b faces the first end portion 30a of the hub axle 30.

[0078] As mentioned above, Figure 7 As shown, the first inner race 42a of the first bearing 42 includes a first axially facing portion 42a1 and a second axially facing portion 42a2, while the first outer race 42b of the first bearing 42 includes a first axially facing portion 42b1 and a second axially facing portion 42b2. The first axially facing portion 42a1 and the first axially facing portion 42b1 are axially aligned with respect to the axial direction Y. Furthermore, the first axially facing portion 42a1 and the first axially facing portion 42b1 face the first end 30a of the hub axle 30. The second axially facing portion 42a2 and the second axially facing portion 42b2 are axially aligned with respect to the axial direction Y. Furthermore, the second axially facing portion 42a2 and the second axially facing portion 42b2 face the second end 30b of the hub axle 30. Therefore, the first axially facing portion 42a1 and the first axially facing portion 42b1 are closer to the first end 30a of the hub axle 30 than the second axially facing portion 42a2 and the second axially facing portion 42b2. Furthermore, the second axially facing portion 42a2 and the second axially facing portion 42b2 are closer to the second end 30b of the hub axle 30 than the first axially facing portion 42a1 and the first axially facing portion 42b1. When the inner retainer 44 is screwed into the sprocket support 34, the first inner race 42a is sandwiched between the first inner abutment portion 30d of the hub axle 30 and the axially facing surface 44c. When the outer retainer 46 is screwed onto the second end 30b of the hub axle 30, the first outer race 42b is sandwiched between the first outer abutment portion 34a and the axially facing surface 46b. The first inner race 42a also has a second axially facing portion 42a2, which faces in the opposite direction to the first axially facing portion 42a1 with respect to the axial direction Y. The first outer race 42b also has a second axially facing portion 42b2, which faces in the opposite direction to the first axially facing portion 42b1 with respect to the axial direction Y.

[0079] like Figure 7 As shown, the inner retainer 44 is provided with a first sealing ring 66 and a second sealing ring 68. The outer retainer 46 is provided with a sealing ring 70. The first sealing ring 66 is disposed inside the inner retainer 44, while the second sealing ring 68 is disposed outside the inner retainer 44. The first sealing ring 66 seals the interface between the hub axle 30 and the inner retainer 44. The sealing ring 70 is disposed inside the outer retainer 46 and contacts the outer surface of the inner retainer 44. The second sealing ring 68 and the sealing ring 70 form a labyrinth structure. For example, this structure prevents the ingress of muddy water and dust from the outside.

[0080] Now refer to Figure 6The configuration of the first inner abutment portion 30d and the second inner abutment portion 30e will now be discussed in greater detail. In the illustrated embodiment, the first inner abutment portion 30d is integrally formed on the outer surface of the hub axle 30 as an integral part of the hub axle 30. Similarly, in the illustrated embodiment, the second inner abutment portion 30e is integrally formed on the outer surface of the hub axle 30 as an integral part of the hub axle 30. However, one or both of the first inner abutment portion 30d and the second inner abutment portion 30e may be separate components fixedly secured to the hub axle 30 as needed and / or desired. Furthermore, the outermost point P1 of the first inner abutment portion 30d of the hub axle 30 is radially spaced a first radial distance X1 from the rotational axis CA, and the innermost point P2 of the second inner abutment portion 30e of the hub axle 30 is radially spaced a second radial distance X2 from the rotational axis CA, the second radial distance X2 being greater than the first radial distance X1. Thus, during installation of the second bearing 43 press-fitted with the sprocket support 34 , the second bearing 43 can pass over the first inner abutment 30 d , but not over the second inner abutment 30 e .

[0081] Similarly, in the illustrated embodiment, the first outer abutment 34a is integrally formed on the inner surface of the sprocket support 34 (i.e., the rotating body) as a component of the sprocket support 34 (i.e., the rotating body). Moreover, the second outer abutment 34b is integrally formed on the inner surface of the rotating body as a component of the sprocket support 34 (i.e., the rotating body). However, one or both of the first outer abutment 34a and the second outer abutment 34b can be separate components fixedly fastened to the sprocket support 34 as needed and / or desired. The innermost point P3 of the first outer abutment 34a of the sprocket support 34 (i.e., the rotating body) is radially spaced apart from the rotation axis CA by a third radial distance X3, and the innermost point P4 of the second outer abutment 34b of the sprocket support 34 (i.e., the rotating body) is radially spaced apart from the rotation axis CA by a fourth radial distance X4, and the fourth radial distance X4 is greater than the third radial distance X3. The outermost point P1 of the first inner abutment portion 30 d of the hub axle 30 is radially spaced apart from the rotation axis CA by a first radial distance X1 , and the fourth radial distance X4 is greater than the first radial distance X1 .

[0082] Special reference will now be made to Figure 9The structure of the hub 10B is described. The hub 10B basically includes a hub axle 130 and a hub shell 132. The hub shell 132 is an example of a rotating body. In other words, the hub 10A includes a hub axle (e.g., the hub axle 130) and a rotating body (e.g., the hub shell 132). Therefore, in the hub 10B, the rotating body includes the hub shell 132. The hub axle 30 defines a rotation axis CA1. Therefore, in the hub 10B, the hub shell 132 is rotatably mounted on the hub axle 130 so as to rotate about the rotation axis CA1 in substantially the same manner as the sprocket support 34 is rotatably mounted on the hub axle 30 in the hub 10A. In other words, the rotating body (e.g., the hub shell 132) is rotatably mounted on the hub axle 130 so as to rotate about the rotation axis CA1. In view of the similarities between the hubs 10A and 10B, the hub 10B will not be discussed in the same detail.

[0083] The hub shell 132 has a central tubular body 132a and a pair of spoke attachment flanges 132b and 132c extending radially outward from the central tubular body 132a. The spoke attachment flanges 132b and 132c are configured to receive the inner ends of the spokes of the rear wheel in a conventional manner. Thus, the rotating body (i.e., the hub shell 132) includes the spoke attachment structure (i.e., the spoke attachment flanges 132b and 132c).

[0084] Here, the hub 10B further includes a retainer 140 threadedly connected to the first end of the hub axle 130. Furthermore, the hub 10B further includes a first bearing 142 and a second bearing 143. The retainer 140 is configured to axially position the second bearing 143. The first bearing 142 and the second bearing 143 are radial ball bearings. The inner retainer 140 is arranged with clearance relative to the inner ring of the second bearing 143. Alternatively, the inner retainer 140 is arranged to contact the inner ring of the second bearing 143 to an extent that it does not affect the performance of the second bearing 143. Furthermore, the hub 10B further includes an inner retainer 144 and an outer retainer 146. The inner retainer 144 and the outer retainer 146 are configured to axially position the first bearing 142. Specifically, the hub axle 130 is provided with an inner abutment 147, while the hub shell 132 (i.e., the rotating body) includes an outer abutment 149. In this way, axial movement of the first bearing 142 is prevented.

[0085] In understanding the scope of the present invention, the terms "include" and its derivatives as used herein are intended to be open-ended terms that specify the presence of stated features, elements, components, groups, wholes, and / or steps, but do not exclude the presence of other unstated features, elements, components, groups, wholes, and / or steps. The foregoing also applies to words with similar meanings, such as the terms "comprise," "have," and their derivatives. Furthermore, unless otherwise specified, the terms "part," "segment," "portion," "member," or "element" when used in the singular may have the dual meaning of a single part or a plurality of parts.

[0086] As used herein, the following directional terms, "frame-facing side," "non-frame-facing side," "forward," "backward," "front," "back," "up," "down," "above," "below," "upward," "downward," "top," "bottom," "side," "vertical," "horizontal," "perpendicular," and "lateral," and any other similar directional terms, refer to those directions of a human-powered vehicle (e.g., a bicycle) in an upright riding position and equipped with a wheel hub. Therefore, when used to describe the wheel hub, these directional terms should be interpreted relative to a human-powered vehicle (e.g., a bicycle) in an upright riding position on a horizontal surface and equipped with a wheel hub. The terms "left" and "right" are used to indicate "right" being referenced from the right side when viewed from the rear of a human-powered vehicle (e.g., a bicycle), and "left" being referenced from the left side when viewed from the rear of a human-powered vehicle (e.g., a bicycle).

[0087] As used in this disclosure, the phrase "at least one" means "one or more" of the desired options. For one example, as used in this disclosure, the phrase "at least one" means "only one single option" or "both of the two options" if the number of the options is two. For another example, as used in this disclosure, the phrase "at least one" means "only one single option" or "any combination of equal to or greater than two options" if the number of the options is equal to or greater than three. Furthermore, as used in this disclosure, the term "and / or" means "either one or both."

[0088] Furthermore, it will be understood that although the terms "first" and "second" may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. Thus, for example, the first component discussed above could be referred to as the second component, and vice versa, without departing from the teachings of the present invention.

[0089] As used herein, the terms "attached" or "attached" include configurations where one element is directly secured to another element by attaching the element directly to the other element; configurations where the element is indirectly secured to the other element by attaching the element to an intermediate member that is in turn attached to the other element; and configurations where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words of similar meaning, such as, "engage," "connect," "couple," "mount," "couple," "fix," and their derivatives. Finally, as used herein, terms of degree, such as "substantially," "approximately," and "approximately" refer to an amount of deviation of the modified term such that the end result is not significantly changed.

[0090] Although only selected embodiments have been selected to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications may be made herein without departing from the scope of the present invention as defined in the appended claims. For example, unless otherwise specifically stated, the size, shape, position or orientation of the various components may be changed as needed and / or desired, as long as these changes do not substantially affect their intended function. Unless otherwise specifically stated, components shown as being directly connected or in contact with each other may have an intermediate structure disposed therebetween, as long as these changes do not substantially affect their intended function. Unless otherwise specifically stated, the function of one element may be performed by two elements, and vice versa. The structure and function of one embodiment may be adopted in another embodiment. Not all advantages must exist simultaneously in a particular embodiment. Each feature that is unique compared to the prior art, alone or in combination with other features, should also be considered as a separate description of further inventions by the applicant, including the structural and / or functional concepts embodied by such features. Therefore, the above description of the embodiments according to the present invention is intended to be illustrative only and is not intended to limit the present invention as defined by the appended claims and their equivalents.

Claims

1. A wheel hub for a human-powered vehicle, comprising: a hub axle including a first inner abutment portion, the hub axle defining an axis of rotation, the first inner abutment portion being integrally formed on an outer surface of the hub axle as an integral part of the hub axle; a rotating body rotatably mounted on the hub shaft to rotate about the rotation axis, the rotating body comprising a first outer abutment; a first bearing disposed between the hub shaft and the rotating body in a radial direction relative to the rotation axis to rotatably couple the rotating body to the hub shaft, the first bearing comprising a first inner ring, a first outer ring, and a plurality of first roller elements disposed between the first inner ring and the first outer ring, the first inner ring having a first axially facing portion abutting the first inner abutment portion of the hub shaft, and the first outer ring having a first axially facing portion abutting the first outer abutment portion of the rotating body; an inner retainer coupled to the hub axle and abutting a second axially facing portion of the first inner race of the first bearing; an outer retainer coupled to the rotating body and abutting a second axially facing portion of the first outer ring of the first bearing; as well as a second bearing disposed between the hub shaft and the rotating body in a radial direction relative to the rotation axis to rotatably couple the rotating body to the hub shaft, the second bearing comprising a second inner ring, a second outer ring, and a plurality of second roller elements disposed between the second inner ring and the second outer ring, the second inner ring having a third axially facing portion facing the second inner abutment portion of the hub shaft, and the second outer ring having a third axially facing portion facing the second outer abutment portion of the rotating body; The second inner abutment of the hub axle is axially spaced from the second inner race of the second bearing.

2. The wheel hub according to claim 1, wherein: The inner retainer is adjustably coupled to the hub shaft in an axial direction relative to the rotation axis.

3. The wheel hub according to claim 1 or 2, wherein: The inner retainer has an internal thread that threadably engages with the external thread of the hub axle.

4. The wheel hub according to claim 1 or 2, wherein: The outer holder is adjustably coupled to the rotating body in an axial direction relative to the rotation axis.

5. The wheel hub according to claim 1 or 2, wherein: The outer retainer has an outer thread that is threadably engaged with the inner thread of the rotating body.

6. The wheel hub according to claim 1 or 2, wherein: The hub axle includes a hollow body.

7. The wheel hub according to claim 1 or 2, wherein: The first outer abutment portion is integrally formed on the inner surface of the rotating body as a component of the rotating body.

8. The wheel hub according to claim 1, wherein: An outermost point of the first inner abutment of the hub axle is radially spaced a first radial distance from the axis of rotation, and an innermost point of the second inner abutment of the hub axle is radially spaced a second radial distance from the axis of rotation, the second radial distance being greater than the first radial distance.

9. The wheel hub according to claim 1, wherein: An innermost point of the first outer abutment of the rotating body is radially spaced a third radial distance from the axis of rotation, and an innermost point of the second outer abutment of the rotating body is radially spaced a fourth radial distance from the axis of rotation, the fourth radial distance being greater than the third radial distance.

10. The wheel hub according to claim 9, wherein: An outermost point of the first inner abutment of the hub axle is radially spaced a first radial distance from the rotational axis, and the fourth radial distance is greater than the first radial distance.

11. The wheel hub according to claim 1, wherein: The second inner abutment portion is integrally formed on the outer surface of the hub axle as an integral part of the hub axle.

12. The wheel hub according to claim 1, wherein: The second outer abutment portion is integrally formed on the inner surface of the rotating body as a component of the rotating body.

13. The wheel hub according to claim 1 or 2, wherein: The rotating body includes a sprocket support.

14. The wheel hub according to claim 1 or 2, further comprising: a hub shell rotatably mounted on the hub axle to rotate about the rotation axis, and The rotating body is coupled to the hub shell to rotate together about the rotation axis in a driving rotation direction, and the rotating body is configured to rotate relative to the hub shell about the rotation axis in a non-driving rotation direction.

15. The wheel hub according to claim 1 or 2, wherein: The rotating body includes a spoke attachment structure.

16. The wheel hub according to claim 1 or 2, wherein: The rotating body includes a hub shell.

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