Hub for human-powered vehicles

Abstract

To provide a stronger hub for a man-powered vehicle.SOLUTION: A hub for a man-powered vehicle comprises: a shaft member; and a rotary body provided coaxially with the shaft member so as to rotate relative to the shaft member. The shaft member has a minimum inner diameter and a maximum outer diameter. The minimum inner diameter is set 4.5-5.5 mm, and the maximum outer diameter is set in a range of 230% or more with respect to the minimum inner diameter.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hub for a human-powered vehicle. [Background technology]

[0002] Patent Document 1 discloses an example of a hub for a human-powered vehicle. The hub in Patent Document 1 includes a shaft member and a rotor that is provided coaxially with the shaft member and rotates relative to the shaft member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-46538 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a need to provide a stronger hub for a human-powered vehicle. [Means for solving the problem]

[0005] A hub for a human-powered vehicle according to a first aspect of the present invention is a hub for a human-powered vehicle, comprising a shaft member and a rotating body arranged coaxially with the shaft member so as to rotate relative to the shaft member, the shaft member having a minimum inner diameter and a maximum outer diameter, the minimum inner diameter being set to be between 4.5 mm and 5.5 mm, and the maximum outer diameter being set to be in a range of 230% or more of the minimum inner diameter. According to the hub for a human-powered vehicle of the first aspect, the maximum outer diameter falls within the above range, and therefore the strength is high.

[0006] In a hub for a human-powered vehicle according to a second aspect of the present invention, the maximum outer diameter is set in a range of 365% or less of the minimum inner diameter. According to the hub for a human-powered vehicle of the second aspect, the maximum outer diameter falls within the above range, so the radial dimension of the shaft member is unlikely to become large.

[0007] A hub for a human-powered vehicle according to a third aspect of the present invention is a hub for a human-powered vehicle comprising a shaft member and a rotating body arranged coaxially with the shaft member so as to rotate relative to the shaft member, the shaft member having a minimum inner diameter and a maximum outer diameter, the minimum inner diameter being set to be between 11.5 mm and 12.5 mm, and the maximum outer diameter being set to be in a range of 130% or more of the minimum inner diameter. According to the hub for a human-powered vehicle of the third aspect, the maximum outer diameter falls within the above range, and therefore the strength is high.

[0008] In a hub for a human-powered vehicle according to a fourth aspect of the present invention, the maximum outer diameter is set in a range of 155% or less of the minimum inner diameter. According to the hub for a human-powered vehicle of the fourth aspect, the maximum outer diameter falls within the above range, so that the radial dimension of the shaft member is unlikely to become large.

[0009] A hub for a human-powered vehicle according to a fifth aspect of the present invention is a hub for a human-powered vehicle comprising an axle member and a rotating body arranged coaxially with the axle member so as to rotate relative to the axle member, the axle member including at least one of a first axle member at least partially inserted into the rotating body and a second axle member at least partially inserted into the rotating body, the first axle member having a minimum inner diameter and a maximum outer diameter, the second axle member having a minimum inner diameter and a maximum outer diameter, the minimum inner diameter of the first axle member being different from the minimum inner diameter of the second axle member and the maximum outer diameter of the first axle member being different from the maximum outer diameter of the second axle member, the rotating body being configured so that the first axle member and the second axle member can be selectively inserted. According to the hub for a human-powered vehicle of the fifth aspect, a plurality of shaft members can be selectively used for one rotating body, thereby improving productivity.

[0010] A hub for a human-powered vehicle according to a sixth aspect of the present invention is a hub for a human-powered vehicle, comprising an axle member and a rotating body arranged coaxially with the axle member so as to rotate relative to the axle member, the axle member including an inserted portion that is inserted into the rotating body, the inserted portion including a first portion and a second portion having an outer diameter larger than that of the first portion. According to the hub for a human-powered vehicle of the sixth aspect, the strength is high because it includes the second portion.

[0011] In a hub for a human-powered vehicle of a seventh aspect according to the sixth aspect, the shaft member has a minimum inner diameter, and the first portion of the shaft member has a first maximum outer diameter, the minimum inner diameter being 14.5 mm to 15.5 mm, and the first maximum outer diameter being set in a range of 120% or more of the minimum inner diameter. According to the hub for a human-powered vehicle of the seventh aspect, the first maximum outer diameter falls within the above range, and therefore the strength is high.

[0012] In a hub for a human-powered vehicle according to an eighth aspect of the seventh aspect, the first maximum outer diameter is set in a range of 125% or less of the minimum inner diameter. According to the hub for a human-powered vehicle of the eighth aspect, the first maximum outer diameter falls within the above range, so that the radial dimension of the shaft member is unlikely to become large.

[0013] In a hub for a human-powered vehicle of a ninth aspect according to any one of the sixth to eighth aspects, the shaft member has a minimum inner diameter, and the second portion of the shaft member has a second maximum outer diameter, the minimum inner diameter being 14.5 mm to 15.5 mm, and the second maximum outer diameter being set in a range of 130% or more of the minimum inner diameter. According to the hub for a human-powered vehicle of the ninth aspect, the second maximum outer diameter falls within the above range, and therefore the strength is high.

[0014] In a hub for a human-powered vehicle according to a tenth aspect of the present invention, the second maximum outer diameter is set in a range of 140% or less of the minimum inner diameter. According to the hub for a human-powered vehicle of the tenth aspect, the second maximum outer diameter falls within the above range, so that the radial dimension of the shaft member is unlikely to become large.

[0015] In a hub for a human-powered vehicle of an 11th aspect according to any one of the 6th to 10th aspects, the hub further includes a bearing that rotatably supports the rotating body on the shaft member, and the bearing includes a ball pusher provided on the shaft member, a ball support provided on the rotating body, and a plurality of spheres arranged between the ball pusher and the ball support. According to the hub for a human-powered vehicle of the eleventh aspect, the rotating body can be rotated suitably relative to the shaft member.

[0016] In a hub for a human-powered vehicle of a twelfth side according to the eleventh side, the bearing has a protrusion that prevents foreign matter from entering the rotating body. According to the hub for a human-powered vehicle of the twelfth aspect, the number of parts can be reduced.

[0017] In a hub for a human-powered vehicle having a thirteenth side surface according to the twelfth side surface, the protrusion is configured to protrude radially outward from the shaft member. According to the hub for a human-powered vehicle of the thirteenth aspect, foreign matter can be suitably prevented from entering the rotating body.

[0018] The hub for a human-powered vehicle of a fourteenth aspect according to any one of the first to thirteenth aspects further includes a power generation mechanism disposed between the shaft member and the rotating body. According to the hub for a human-powered vehicle of the fourteenth aspect, convenience can be improved.

[0019] In a hub for a human-powered vehicle of a fifteenth aspect according to the fourteenth aspect, the power generation mechanism includes a stator provided on the shaft member and a magnet provided on the rotating body. According to the hub for a human-powered vehicle of the fifteenth aspect, a simple configuration can be achieved. [Effects of the Invention]

[0020] The hub of the present invention provides greater strength. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 2 is a cross-sectional view of the hub for the human-powered vehicle according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the hub for the human-powered vehicle according to the first embodiment. [Figure 3] FIG. 2 is a perspective view of the first shaft member of FIG. 1; [Figure 4] FIG. 3 is a perspective view of the second shaft member of FIG. 2. [Figure 5] FIG. 2 is an exploded perspective view of the stator and magnets of FIG. 1. [Figure 6] FIG. 10 is a cross-sectional view of a hub for a human-powered vehicle according to a second embodiment. [Figure 7] FIG. 7 is a perspective view of the shaft member of FIG. 6. [Figure 8] 8 is a partial cross-sectional view of the shaft member of FIG. 7 to which a third positioning member is attached. [Figure 9] FIG. 7 is a perspective view of the cone pusher of FIG. 6; [Figure 10] 10 is a cross-sectional view taken along line D10-D10 in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0022] The phrase "at least one" as used herein means "one or more" of the desired options. As an example, the phrase "at least one" as used herein means "only one option" or "both of two options" if the number of options is two. As another example, the phrase "at least one" as used herein means "only one option" or "any combination of two or more options" if the number of options is three or more.

[0023] In the first and second embodiments, the term "human-powered vehicle" refers to a vehicle that uses human power at least partially as a driving force for travel, and includes vehicles that electrically supplement human power. Vehicles that use only a driving force other than human power are not included in the human-powered vehicle. In particular, vehicles that use only an internal combustion engine as a driving force are not included in the human-powered vehicle. Typically, human-powered vehicles are assumed to be small, lightweight vehicles that do not require a license to drive on public roads. In one example, the human-powered vehicle is a bicycle (e-bike) that includes an assist device that uses electrical energy to assist the propulsion of the human-powered vehicle. More specifically, it is a city bicycle. The configuration of the human-powered vehicle can be freely changed. The human-powered vehicle can also be configured without the assist device. In other words, the human-powered vehicle may be a regular bicycle that is driven solely by human driving force. The type of human-powered vehicle may be a road bike, mountain bike, or cross bike.

[0024] First Embodiment A hub 10 for a human-powered vehicle will be described with reference to FIGS. 1 to 5. Hereinafter, the hub 10 for a human-powered vehicle may be referred to as the hub 10. The hub 10 is configured as, for example, a hub dynamo. The hub 10 is for a human-powered vehicle and includes a shaft member 12 and a rotating body 14 that is coaxial with the shaft member 12 and rotates relative to the shaft member 12. The hub 10 preferably further includes a power generation mechanism 16 that is disposed between the shaft member 12 and the rotating body 14. The hub 10 preferably further includes an intermediate member 18, a first bearing 20, a second bearing 22, a first positioning member 24, and a second positioning member 26. The shaft member 12 includes at least one of a first shaft member 28 that is at least partially inserted into the rotating body 14 as shown in FIG. 1, and a second shaft member 30 that is at least partially inserted into the rotating body 14 as shown in FIG. 2. The rotating body 14 is configured so that the first shaft member 28 and the second shaft member 30 can be selectively inserted therein. The hub 10 is configured so that the first shaft member 28 and the second shaft member 30 can be selectively inserted into the rotating body 14 by using common parts other than the first shaft member 28 and the second shaft member 30. Hereinafter, the first shaft member 28 and the second shaft member 30 may be referred to as shaft members 12.

[0025] The shaft member 12 is, for example, a hub axle. The shaft member 12 is, for example, cylindrical. The rotating body 14 is, for example, a hub shell. The rotating body 14 has a flange 14A on its outer periphery for connecting with spokes of a front or rear wheel. The rotating body 14 is, for example, cylindrical. The intermediate member 18 is, for example, cylindrical. The shaft member 12 is inserted into the intermediate member 18. The intermediate member 18 includes a first intermediate member 18A and a second intermediate member 18B. The first intermediate member 18A is disposed between the first bearing 20 and the first positioning member 24 in the axial direction of the shaft member 12. The second intermediate member 18B is disposed between the second bearing 22 and the second positioning member 26 in the axial direction of the shaft member 12.

[0026] The first bearing 20 and the second bearing 22 rotatably support the rotating body 14 relative to the shaft member 12. The first bearing 20 and the second bearing 22 are provided between the inner periphery of the rotating body 14 and the outer periphery of the shaft member 12. The first bearing 20 is provided at a position close to one end of the shaft member 12 in the axial direction. The second bearing 22 is provided at a position close to the other end of the shaft member 12 in the axial direction.

[0027] The first positioning member 24 is formed, for example, in an annular shape. The first positioning member 24 is attached to the shaft member 12 so as to be non-rotatable relative to the shaft member 12. The first positioning member 24 is attached to one end of the stator 16A of the power generation mechanism 16 in the axial direction of the shaft member 12. The first positioning member 24 restricts axial movement of the stator 16A. The second positioning member 26 is formed, for example, in an annular shape. The second positioning member 26 is attached to the shaft member 12 so as to be non-rotatable relative to the shaft member 12. The second positioning member 26 is attached to the other end of the stator 16A in the axial direction of the shaft member 12. The second positioning member 26 restricts axial movement of the stator 16A. The second positioning member 26 is thinner than the first positioning member 24.

[0028] As shown in FIGS. 1 and 3, the first shaft member 28 includes an inserted portion 28A that is inserted into the rotating body 14, and a reduced-diameter portion 28B that protrudes from the end of the inserted portion 28A. The inserted portion 28A has a larger maximum outer diameter than the reduced-diameter portion 28B. As shown in FIG. 1, the reduced-diameter portion 28B is non-rotatably supported on the frame F of the human-powered vehicle. The first shaft member 28 is detachably fixed to the frame F by, for example, a quick-release mechanism 28X. As shown in FIG. 3, an axially extending groove 28C is provided on the outer circumferential surface of the first shaft member 28. Electrical wiring extending from the coil 36 of the stator 16A is housed in the groove 28C.

[0029] 2 and 4, the second shaft member 30 includes an inserted portion 30A that is inserted into the rotor 14, and a reduced-diameter portion 30B that protrudes from the end of the inserted portion 30A. The inserted portion 30A has a larger maximum outer diameter than the reduced-diameter portion 30B. A groove 30C extending in the axial direction is provided on the outer circumferential surface of the second shaft member 30. The groove 30C accommodates electrical wiring extending from the coil 36 of the stator 16A.

[0030] The shaft member 12 has a minimum inner diameter and a maximum outer diameter. Specifically, as shown in FIG. 1, the first shaft member 28 has a minimum inner diameter LA and a maximum outer diameter LB. The minimum inner diameter LA is the smallest inner diameter of the reduced diameter portion 28B. The maximum outer diameter LB is the largest outer diameter of the inserted portion 28A. The minimum inner diameter LA is set to 4.5 mm to 5.5 mm. The maximum outer diameter LB is set to a range of 230% or more of the minimum inner diameter LA. The ratio of the maximum outer diameter LB to the minimum inner diameter LA can be selected arbitrarily. The maximum outer diameter LB is preferably set to a range of 365% or less of the minimum inner diameter LA.

[0031] As shown in FIG. 2 , the second shaft member 30 has a minimum inner diameter LC and a maximum outer diameter LD. The minimum inner diameter LC is the smallest inner diameter of the reduced diameter portion 30B. The maximum outer diameter LD is the largest outer diameter of the inserted portion 30A. The minimum inner diameter LC is set to 11.5 mm to 12.5 mm. The maximum outer diameter LD is set to a value in the range of 130% or more of the minimum inner diameter LC. The ratio of the maximum outer diameter LD to the minimum inner diameter LC can be selected arbitrarily. The maximum outer diameter LD is preferably set to a value in the range of 155% or less of the minimum inner diameter LC. The minimum inner diameter LA of the first shaft member 28 is different from the minimum inner diameter LC of the second shaft member 30. The maximum outer diameter LB of the first shaft member 28 is different from the maximum outer diameter LD of the second shaft member 30. The maximum outer diameter LB of the first shaft member 28 and the maximum outer diameter LD of the second shaft member 30 may be the same. Even when the maximum outer diameter LB is the same as the maximum outer diameter LD, the maximum outer diameter LB is set to be in a range of 230% or more with respect to the minimum inner diameter LA. Even when the maximum outer diameter LD is the same as the maximum outer diameter LB, the maximum outer diameter LD is set to be in a range of 130% or more with respect to the minimum inner diameter LC.

[0032] The power generation mechanism 16 includes a stator 16A provided on one of the shaft member 12 and the rotor 14, and a magnet 16B provided on the other of the shaft member 12 and the rotor 14. In this embodiment, the power generation mechanism 16 includes a stator 16A provided on the shaft member 12, and a magnet 16B provided on the rotor 14.

[0033] The stator 16A is provided on the outer periphery of the shaft member 12 so as to be unable to rotate relative to the shaft member 12. The stator 16A has a first yoke 32, a second yoke 34, and a coil 36. The stator 16A further includes a bobbin 38 around which the coil 36 is wound.

[0034] 5, the first yoke 32 includes at least one first yoke piece 40. The first yoke 32 includes two or more first yoke pieces 40 arranged in the circumferential direction of the shaft member 12. The first yoke 32 includes, for example, 18 first yoke pieces 40. The first yoke pieces 40 are arranged at equal intervals in the circumferential direction of the shaft member 12. The first yoke pieces 40 are fitted into recesses 38A provided in the bobbin 38, thereby maintaining their relative positions.

[0035] The second yoke 34 includes at least one second yoke piece 42. The second yoke 34 includes two or more second yoke pieces 42 lined up in the circumferential direction of the shaft member 12. The second yoke 34 includes, for example, 18 second yoke pieces 42. The second yoke pieces 42 are formed separately from the first yoke pieces 40. The first yoke piece 40 and the second yoke piece 42 are preferably made of the same material. The first yoke piece 40 and the second yoke piece 42 preferably have the same shape. The number of first yoke pieces 40 and the number of second yoke pieces 42 are equal. The second yoke pieces 42 are arranged at equal intervals in the circumferential direction of the shaft member 12. The second yoke pieces 42 are fitted into recesses 38A provided in the bobbin 38, thereby maintaining their relative positions.

[0036] The magnet 16B is mounted on the rotor 14 with its poles aligned circumferentially. The magnet 16B is mounted on the inner periphery of the rotor 14 so as to be unable to rotate relative to the rotor 14. As shown in FIG. 5 , the magnet 16B has a first magnet 44 and a second magnet 46. The first magnet 44 is formed by attaching a plurality of magnets 44A to the inner periphery of a cylindrical first support member 48. The second magnet 46 is formed by attaching a plurality of magnets 46A to the inner periphery of a cylindrical second support member 50. The first magnet 44 and the second magnet 46 are preferably neodymium magnets, sintered magnets, or bonded magnets.

[0037] The first magnets 44 and the second magnets 46 are arranged such that the poles of the first magnets 44 and the poles of the second magnets 46 are offset in the circumferential direction of the shaft member 12. The first magnets 44 and the second magnets 46 are arranged such that their respective south poles and north poles alternate in the circumferential direction of the shaft member 12. Therefore, in the axial direction of the shaft member 12, the south poles of the first magnets 44 and the south poles of the second magnets 46 do not line up, and the north poles of the first magnets 44 and the north poles of the second magnets 46 do not line up. The first magnets 44 can face the first yoke pieces 40 in the radial direction of the shaft member 12. The number of first yoke pieces 40 and the number of poles of the first magnets 44 are equal. The second magnets 46 can face the second yoke pieces 42 in the radial direction of the shaft member 12. The number of second yoke pieces 42 and the number of poles of the second magnets 46 are equal. The number of poles of the first magnets 44 and the number of poles of the second magnets 46 are equal.

[0038] The hub 10 for a human-powered vehicle according to the first embodiment provides the following advantages. The hub 10 of the first embodiment has standardized parts other than the first shaft member 28 and the second shaft member 30. Because the first shaft member 28 and the second shaft member 30 can be selectively inserted into the rotating body 14, the hub 10 can be easily modified to have different specifications, thereby increasing convenience.

[0039] Second Embodiment A hub 60 for a human-powered vehicle according to a second embodiment will be described with reference to Figures 6 to 10. Components common to those in the first embodiment are given the same reference numerals as in the first embodiment, and duplicated descriptions will be omitted.

[0040] The hub 60 is for a human-powered vehicle and includes a shaft member 62 and a rotating body 14 that is coaxial with the shaft member 62 and rotates relative to the shaft member 62. The shaft member 62 is, for example, a hub axle. The shaft member 62 is, for example, cylindrical. The shaft member 62 includes an inserted portion 64 that is inserted into the rotating body 14. The inserted portion 64 includes a first portion 64A and a second portion 64B that has a larger outer diameter than the first portion 64A. As shown in FIG. 7 , an axially extending groove 62A is provided on the outer peripheral surface of the shaft member 62. The groove 62A accommodates electrical wiring extending from the coil 36. The shaft member 62 has a minimum inner diameter LE. The minimum inner diameter LE is the smallest inner diameter of the first portion 64A. The first portion 64A of the shaft member 62 has a first maximum outer diameter LF. The minimum inner diameter LE is 14.5 mm to 15.5 mm. The ratio of the first maximum outer diameter LF to the minimum inner diameter LE can be selected arbitrarily. The first maximum outer diameter LF is preferably set in a range of 120% or more of the minimum inner diameter LE. The first maximum outer diameter LF is preferably set in a range of 125% or less of the minimum inner diameter LE. The second portion 64B of the shaft member 62 has a second maximum outer diameter LG. The ratio of the second maximum outer diameter LG to the minimum inner diameter LE can be selected arbitrarily. The second maximum outer diameter LG is preferably set in a range of 130% or more of the minimum inner diameter LE. The second maximum outer diameter LG is preferably set in a range of 140% or less of the minimum inner diameter LE.

[0041] As shown in FIG. 8, a third positioning member 68 is provided on the second portion 64B. The third positioning member 68 is provided in place of the second positioning member 26 of the first embodiment. The third positioning member 68 has the same shape as the first positioning member 24. The third positioning member 68 is attached to the second portion 64B so as not to rotate relative to the shaft member 62. In the second embodiment, since the third positioning member 68 is provided, the second intermediate member 18B of the intermediate member 18 is omitted.

[0042] The hub 60 preferably further includes a bearing 72 that rotatably supports the rotating body 14 on the shaft member 62. The bearing 72 is provided in place of the first bearing 20 of the first embodiment. The bearing 72 is provided at a position closer to one end of the shaft member 62 than the first positioning member 24. The bearing 72 includes a cone 74 provided on the shaft member 62, a ball bearing 76 provided on the rotating body 14, and a plurality of spheres 78 arranged between the cone 74 and the ball bearing 76. The outer diameter of the plurality of spheres 78 is smaller than the outer diameter of the sphere 22A of the second bearing 22.

[0043] The bearing 72 preferably has a protrusion 80 that prevents foreign matter from entering the rotor 14. The protrusion 80 prevents foreign matter from entering the rotor 14 through, for example, the opening 14B of the rotor 14. The location of the protrusion 80 on the bearing 72 can be selected arbitrarily. In the example shown in FIGS. 9 and 10 , the protrusion 80 is provided on the cone 74. As shown in FIG. 6 , the protrusion 80 is provided at a position in the axial direction of the shaft member 62 closer to the opening 14B of the rotor 14 than the ball support portion 74A of the cone 74 that supports the ball 78. In another example, the protrusion 80 is provided on the ball seat 76. The protrusion 80 is preferably configured to protrude radially outward from the shaft member 62. A gap is formed between the tip 80A of the protrusion 80 and the inner circumferential surface 14C of the rotor 14. In other words, the tip 80A of the protrusion 80 does not contact the inner circumferential surface 14C of the rotor 14.

[0044] The hub 60 for a human-powered vehicle according to the second embodiment provides the following advantages. The hub 60 of the second embodiment shares most of the parts with the hub 10 of the first embodiment, except for the shaft member 62. Furthermore, the bearing 72 and the third positioning member 68 may be changed as needed. By changing a small number of parts, such as the bearing 72 and the third positioning member 68, the first shaft member 28, the second shaft member 30, and the shaft member 62 can be selectively inserted into the rotating body 14, so the hub 60 can be easily changed to different specifications. This increases convenience.

[0045] <Modification> The above-described embodiments are merely examples of possible forms of a hub for a human-powered vehicle according to the present invention, and are not intended to limit the forms. A hub for a human-powered vehicle according to the present invention can take the following forms, including modifications of the above-described embodiments, and combinations of at least two mutually consistent modifications. In the following modifications, parts that are common to the embodiments are given the same reference numerals as in the embodiments, and descriptions thereof will be omitted.

[0046] The stator 16A may be provided on the rotor 14, and the magnet 16B may be provided on the shaft member 12, 62. In this case, the current generated in the stator 16A is preferably configured to be output to the outside via a slip ring.

[0047] The hub 10 may further include a freewheel arranged alongside the rotating body 14 in the axial direction along the central axis of the shaft members 12, 62. The freewheel is coupled to the rotating body 14 so as to be rotatable around the shaft members 12, 62. In one example, the freewheel transmits the driving force transmitted to the rear sprocket to the rotating body 14 and rotates together with the rotating body 14 around the shaft members 12, 62. The freewheel is configured to transmit rotation in a first rotational direction to the rotating body 14, but not to transmit rotation in a second rotational direction that is opposite to the first rotational direction to the rotating body 14. [Explanation of symbols]

[0048] 10, 60...hub, 12, 62...shaft member, 14...rotating body, 16...power generation mechanism, 16A...stator, 16B...magnet, 28...first shaft member, 30...second shaft member, 64...inserted portion, 64A...first part, 64B...second part, 72...bearing, 74...ball bearing, 76...ball support, 78...sphere, 80...protrusion.

Claims

1. A hub for a human-powered vehicle, A shaft member; a rotor provided coaxially with the shaft member so as to rotate relative to the shaft member, the shaft member includes at least one of a first shaft member at least partially inserted into the rotating body and a second shaft member at least partially inserted into the rotating body; the first shaft member has a first predetermined minimum inner diameter and a first predetermined maximum outer diameter; the second shaft member has a second predetermined minimum inner diameter and a second predetermined maximum outer diameter; the first predetermined minimum inner diameter is different from the second predetermined minimum inner diameter; the first predetermined maximum outer diameter is different from the second predetermined maximum outer diameter; The rotating body is a hub configured so that the first shaft member and the second shaft member can be selectively inserted therein.

2. the portion of the first shaft member having the first predetermined maximum outer diameter includes a central portion of the first shaft member in the axial direction, The hub according to claim 1 , wherein the portion of the second shaft member having the second predetermined maximum outer diameter includes a central portion of the second shaft member in the axial direction.

3. the first predetermined minimum inner diameter is set to 4.5 mm to 5.5 mm; the first predetermined maximum outer diameter is set in a range of 230% or more of the first predetermined minimum inner diameter, the second predetermined minimum inner diameter is set to 11.5 mm to 12.5 mm; 3. The hub according to claim 1, wherein the second predetermined maximum outer diameter is set within a range of 130% or more of the second predetermined minimum inner diameter.

4. 4. The hub according to claim 3, wherein the second predetermined maximum outer diameter is set within a range of 155% or less of the second predetermined minimum inner diameter.

5. the rotating body is configured so that the first shaft member, the second shaft member, and the third shaft member are selectively inserted therein; the third shaft member includes an inserted portion that is inserted into the rotating body, The hub according to claim 1 , wherein the inserted portion includes a first portion and a second portion having an outer diameter larger than that of the first portion.

6. The first portion has a first maximum outer diameter, the minimum inner diameter of the third shaft member is 14.5 mm to 15.5 mm; The hub according to claim 5 , wherein the first maximum outer diameter is set in a range of 120% or more of the minimum inner diameter of the third shaft member.

7. The hub according to claim 6 , wherein the portion of the third shaft member having the first maximum outer diameter includes a central portion of the third shaft member in the axial direction.

8. The hub according to claim 6 or 7, wherein the first maximum outer diameter is set in a range of 125% or less of the minimum inner diameter of the third shaft member.

9. The second portion has a second maximum outer diameter, the minimum inner diameter of the third shaft member is 14.5 mm to 15.5 mm; The hub according to claim 5 , wherein the second maximum outer diameter is set in a range of 130% or more of the minimum inner diameter of the third shaft member.

10. The hub according to claim 9 , wherein the second maximum outer diameter is set in a range of 140% or less of the minimum inner diameter of the third shaft member.

11. a bearing that rotatably supports the rotating body on the shaft member, 11. A hub according to claim 5, wherein the bearing includes a ball pusher provided on the shaft member, a ball support provided on the rotating body, and a plurality of spheres arranged between the ball pusher and the ball support.

12. The hub according to claim 11, wherein the bearing has a protrusion that prevents foreign matter from entering the rotating body.

13. The hub according to claim 12 , wherein the protrusion is configured to protrude radially outward from the shaft member.

14. The hub according to claim 1 , further comprising a power generation mechanism disposed between the shaft member and the rotating body.

15. The hub according to claim 14 , wherein the power generation mechanism includes a stator provided on the shaft member and a magnet provided on the rotating body.

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