bicycle hub arrangement

Abstract

A bicycle hub assembly comprises a hub axle, a hub shell, and a sprocket support link. The sprocket support link includes a tubular section and a first tooth. The tubular section includes an outer peripheral surface and a mounting section, which is provided only radially inside the outer peripheral surface. The first tooth is designed to be attached to the mounting section of the tubular section. The first tooth comprises a first surface and a second surface. The first surface is designed to face a mounting section of a bicycle sprocket in one circumferential direction of the sprocket support link. The second surface is opposite the first surface in the circumferential direction. The second surface is designed to face the mounting section of the bicycle sprocket in the circumferential direction.The first tooth has a longitudinal axis parallel to the axial direction when attached to the tubular section via the fastening section. The first tooth has at least a partial, substantially L-shaped cross-section along a plane perpendicular to the longitudinal axis.

Description

[0001] The present invention relates to a bicycle hub assembly.

[0002] Cycling has become an increasingly popular form of recreation and transportation. It has also become a very popular competitive sport for both amateurs and professionals. Whether the bicycle is used for recreation, transportation, or competition, the bicycle industry has constantly improved the various components of a bicycle. One bicycle component that has been extensively redesigned is the bicycle hub assembly.

[0003] US 2013 / 0076112A1 describes a protective unit for a drive bushing of a hub comprising a hub with a drive bushing connected to one end thereof, wherein the drive bushing has several ribs extending axially on its outer surface.

[0004] US 2005 / 0009654A1 describes a rear wheel hub having a hub shaft and a hub outer gear configured to be mounted freely rotatable on the hub shaft.

[0005] CN 2 01 646 251 U describes a ratchet sleeve construction for bicycles comprising a sleeve seat, at least one first transmission part and at least one second transmission part.

[0006] DE 10 2012 109 329 A1 describes a freewheel assembly for a bicycle, comprising essentially a freewheel body and a plurality of reinforcing ribs.

[0007] WO 2014 / 200 352 A1 describes a bicycle hub consisting of a hollow cylindrical body which is provided with external teeth whose teeth extend in an axial direction.

[0008] The standard DIN 6885-1 standardizes keyways.

[0009] DE 20 2010 001 830 U1 describes a bicycle hub, in particular a tube part of a rear bicycle hub, with which the force exerted when rotating the flywheels is carried.

[0010] The standard DIN ISO 14 standardizes splined shafts and splined hubs.

[0011] According to a first aspect of the present invention, a bicycle hub assembly comprises a hub shaft, a hub shell, and a sprocket support link. The hub shell is rotatable relative to the hub shaft about one direction of rotation. The sprocket support link is rotatable relative to the hub shaft about the axis of rotation and is configured to support a bicycle sprocket so that it is integrally rotatable with the sprocket support link about the axis of rotation. The sprocket support link comprises a tubular section and a first tooth. The tubular section includes an outer peripheral surface and a mounting section, which is provided only radially inside the outer peripheral surface. The tubular section is made of a first material. The first tooth is configured to be attached to the mounting section of the tubular section and is made of a second material, different from the first material.The first tooth comprises a first surface and a second surface. The first surface is configured to face a mounting section of the bicycle chainring in a circumferential direction of the chainring support link. The second surface is opposite to the first surface in the circumferential direction. The second surface is configured to face the mounting section of the bicycle chainring in the circumferential direction. The first tooth has a longitudinal axis parallel to the axial direction when the first tooth is attached to the tubular section via the mounting section. The first tooth has at least a portion of a substantially L-shaped cross-section along a plane perpendicular to the longitudinal axis.

[0012] Preferably, the bicycle hub assembly is configured such that the mounting section includes a recess provided on the outer peripheral surface of the tubular section. The first tooth preferably comprises a tooth body and a projection. The tooth body preferably includes the first surface and the second surface. The tooth body can be configured to be provided on the outer peripheral surface of the tubular section in a state where the first tooth is attached to the tubular section via the mounting section. The projection can extend from the tooth body and can be configured to be arranged in the recess.

[0013] Preferably, the bicycle hub arrangement is designed such that the recess extends in an axial direction parallel to the axis of rotation.

[0014] Preferably, the bicycle hub arrangement is designed such that the recess has a maximum circumferential length, such that the projection is press-fitted into the recess.

[0015] Preferably, the bicycle hub assembly is designed such that the chainring support link includes a second tooth which projects radially outwards from the outer peripheral surface of the tubular section and is made of the first material. The tooth body preferably has a shape that is essentially the same as the shape of the second tooth in an axial area where the mounting section of the bicycle chainring engages with the tooth body and the second tooth.

[0016] Preferably, the bicycle hub assembly is designed such that the first tooth has a longitudinal axis parallel to the axial direction, in a state where the first tooth is attached to the tubular section via the recess and the projection. The tooth body and the projection can extend along the longitudinal axis.

[0017] Preferably, the bicycle hub assembly is designed such that the tooth body has a first maximum axial length, which is defined along the longitudinal axis. The projection preferably has a second maximum axial length, which is also defined along the longitudinal axis. The second maximum axial length can be shorter than the first maximum axial length.

[0018] Preferably, the bicycle hub assembly is configured such that the tooth body has a first maximum circumferential length, defined in the circumferential direction, in a state where the first tooth is attached to the tubular section via the recess and the projection. The projection preferably has a second maximum circumferential length, defined in the circumferential direction, in a state where the first tooth is attached to the tubular section via the recess and the projection. The second maximum circumferential length may be shorter than the first maximum circumferential length.

[0019] Preferably, the bicycle hub assembly is configured such that the tooth body has a first maximum circumferential length, defined in the circumferential direction, in a state where the first tooth is attached to the tubular section via the recess and the projection. The projection preferably has a second maximum circumferential length, defined in the circumferential direction, in a state where the first tooth is attached to the tubular section via the recess and the projection. The second maximum circumferential length can be equal to the first maximum circumferential length.

[0020] Preferably, the bicycle hub assembly is configured such that the mounting section includes a first inner surface and a second inner surface, which is spaced apart from the first inner surface in the circumferential direction. The projection preferably includes a first circumferential end surface and a second circumferential end surface. The first circumferential end surface can be configured to face the first inner surface in the circumferential direction. The second circumferential end surface can be configured to face the second inner surface in the circumferential direction.

[0021] Preferably, the bicycle hub arrangement is designed such that the first circumferential end surface of the projection is arranged in a plane defined by the first surface of the tooth body. The second circumferential end surface of the projection can be arranged in a plane defined by the second surface of the tooth body.

[0022] Preferably, the bicycle hub assembly is configured such that the tooth body includes an inner peripheral surface facing the outer peripheral surface of the sprocket support link. The mounting section preferably includes a first inner surface. The projection can include a first circumferential end surface configured to face the first inner surface in the circumferential direction. The inner peripheral surface of the tooth body and the first circumferential end surface of the projection can be positioned on a downstream side of the projection in a drive rotation direction of the sprocket support link.

[0023] Preferably, the bicycle hub arrangement is designed such that the inner peripheral surface of the tooth body is essentially perpendicular to the first circumferential end surface of the projection.

[0024] Preferably, the bicycle hub assembly is designed such that the first tooth has a longitudinal axis parallel to the axial direction in a state where the first tooth is attached to the tubular section via the mounting section. Preferably, the first tooth has at least a partially T-shaped cross-section along a plane that is perpendicular to the longitudinal axis.

[0025] Preferably, the bicycle hub assembly is configured such that the mounting section includes a plurality of recesses provided on the outer peripheral surface of the tubular section. The first tooth preferably includes a tooth body and a plurality of projections. The tooth body can include the first surface and the second surface. The tooth body can be configured to be provided on the outer peripheral surface of the tubular section in a state where the first tooth is attached to the tubular section via the mounting section. Preferably, the plurality of projections project from the tooth body and are configured to be arranged in the plurality of recesses.

[0026] Preferably, the bicycle hub assembly further comprises a locking element with which the first tooth is secured to the fastening section.

[0027] Preferably, the bicycle hub assembly is designed such that the fastening section includes a threaded hole. The locking element preferably includes an external threaded portion designed to be screwed into the threaded hole.

[0028] Preferably, the bicycle hub arrangement is designed such that the first material has a hardness that is lower than the hardness of the second material.

[0029] Preferably, the bicycle hub assembly is designed such that the first material comprises an aluminum alloy. The second material preferably comprises an iron alloy.

[0030] Preferably, the bicycle hub assembly is configured such that the chainring support link includes a second tooth and a third tooth. Preferably, the second tooth projects radially outward from the outer peripheral surface of the tubular section and is made of the first material. The third tooth can also project radially outward from the outer peripheral surface of the tubular section and can be made of the first material. The third tooth can be spaced circumferentially from the second tooth. The fastening section can be provided circumferentially between the second and third teeth.

[0031] Preferably, the bicycle hub arrangement is designed such that a distance defined between the mounting section and the second tooth in the circumferential direction is essentially equal to a distance defined between the mounting section and the third tooth in the circumferential direction.

[0032] A more complete appreciation of the invention and many of its associated advantages will be more easily understood once these are better understood by reference to the following detailed description, when considered in conjunction with the accompanying drawings, wherein: Fig. 1 is a perspective view of a bicycle hub arrangement according to a first embodiment; Fig. 2 a cross-sectional view of a sprocket support link of the bicycle hub assembly along line II-II of Fig. 4 is; Fig. 3 A perspective view of the sprocket support link is illustrated in Fig. 1 is; Fig. 4 a cross-sectional view of the sprocket support link along line IV-IV of Fig. 2 is; Fig. 5 A partially enlarged cross-sectional view of the sprocket support link is illustrated in Fig. 4 is; Fig. 6 A top view of a first tooth of the sprocket support link is illustrated in Fig. 1 is; Fig. Figure 7 shows a side elevation view of the first tooth of the sprocket support link, illustrated in the Fig. 1 is; Fig. Figure 8 shows a side elevation view of the first tooth of the sprocket support link. Fig. 1 is; Fig. 9 is a perspective view of a chain wheel support link of a bicycle hub assembly according to a second embodiment; Fig. Figure 10 illustrates a cross-sectional view of the sprocket support link in Fig. 9 is; Fig. 11 is a perspective view of a chain wheel support link of a bicycle hub assembly according to a third embodiment; Fig. Figure 12 illustrates a cross-sectional view of the sprocket support link in Fig. 11 is; Fig. 13 A top view of a first tooth of the sprocket support link is illustrated in Fig. 11 is; Fig. Figure 14 illustrates a side elevation view of the first tooth of the sprocket support link in Fig. 11 is; Fig. 15 A side elevation view of the first tooth of the sprocket support link is illustrated in Fig. 11 is; Fig. 16 is a perspective view of a chain wheel support link of a bicycle hub assembly according to a fourth embodiment; Fig. Figure 17 illustrates a cross-sectional view of the sprocket support link in Fig. 16 is; Fig. Figure 18 illustrates a cross-sectional view of the sprocket support link in Fig. 16 is; Fig. 19 A top view of a first tooth of the sprocket support link is illustrated in Fig. 16 is; Fig. 20 A side elevation view of the first tooth of the sprocket support link is illustrated in Fig. 16. Fig. 21 A side elevation view of the first tooth of the sprocket support link is illustrated in Fig. 16 is; Fig. 22 is a perspective view of a chain wheel support link of a bicycle hub assembly according to a fifth embodiment; Fig. 23 a cross-sectional view of the sprocket support link illustrates in Fig. 22 is; Fig. 24 a top view of a first tooth of the sprocket support link illustrated in Fig. 22 is; Fig. 25 A side elevation view of the first tooth of the sprocket support link is illustrated in Fig. 22 is; Fig. 26 A side elevation view of the first tooth of the sprocket support link is illustrated in Fig. 22 is; Fig. 27 a perspective view of a chain wheel support link of a bicycle hub assembly according to a sixth embodiment; and Fig. 28 a cross-sectional view of the sprocket support link illustrated in Fig. 27 is. DESCRIPTION OF THE EXECUTION FORMS

[0033] Preferred embodiments are now described with reference to the accompanying drawings, wherein the same reference numerals denote corresponding or identical elements throughout the different drawings. First embodiment

[0034] Firstly, referring to Fig. Figure 1 illustrates a bicycle assembly according to a first embodiment. In the illustrated embodiment, the bicycle hub assembly 10 is a rear hub assembly. However, the bicycle hub assembly 10 can be a front hub assembly if necessary and / or desired.

[0035] In this application, the following directional terms, such as "front," "rear," "forward," "backward," "left," "right," "across," "up," and "down," as well as any other similar directional terms, refer to directions determined from the perspective of a user (e.g., a rider) seated on a saddle (not shown) of a bicycle (not shown) facing the handlebars. Accordingly, these terms, as used herein to describe the bicycle hub assembly 10, should be interpreted relative to the bicycle equipped with the bicycle hub assembly 10, which is being used in an upright riding position on a horizontal surface.

[0036] As in Fig. As shown in Figure 1, the bicycle hub assembly 10 comprises a hub shaft 12, a hub shell 14, and a sprocket support link 16. The hub shell 14 is rotatable relative to the hub shaft 12 about an axis of rotation A1. The sprocket support link 16 is also rotatable relative to the hub shaft 12 about the axis of rotation A1. In the illustrated embodiment, the sprocket support link 16 is a separate link from the hub shell 14 and is coupled to it. However, the sprocket support link 16 can be integrally integrated with the hub shell 14 as a single unit link if required and / or desired. Since structures different from the sprocket support link 16 are well known in the field of bicycles, they are not described and / or illustrated in detail here for the sake of brevity.

[0037] Fig. Figure 2 illustrates a cross-section of the chainring support link 16 with the bicycle chainring SP. As in Fig. As shown in Figure 2, the sprocket support link 16 is designed to support a sprocket SP so that it can rotate integrally with the sprocket support link 16 about the axis of rotation A1. In the illustrated embodiment, the sprocket SP is a cassette sprocket comprising the sprockets SP1 to SP10. The sprockets SP1 to SP10 are arranged in an axial direction D1 parallel to the direction of rotation A1 in a state where the sprocket SP is mounted to the sprocket support link 16. The sprocket support link 16 comprises a tubular section 18 and a first tooth 20. The tubular section 18 extends along the axis of rotation A1. The bicycle sprocket SP is provided radially outward from the tubular section 18.

[0038] As in Fig. As shown in Figure 3, the tubular section 18 includes an outer peripheral surface 22 and a mounting section 24. The mounting section 24 is provided only radially inside the outer peripheral surface 22. In the illustrated embodiment, the mounting section 24 includes a recess 26, which is provided on the outer peripheral surface 22 of the tubular section 18. The recess 26 extends in the axial direction D1 parallel to the axis of rotation A1. The first tooth 20 is a separate element from the tubular section 18. The first tooth 20 is designed to be attached to the mounting section 24 of the tubular section 18.

[0039] The tubular section 18 is made of a first material. The first tooth 20 is made of a second material, different from the first. The first material has a lower hardness than the second material. The first material is an aluminum alloy. The second material is an iron alloy. The first material has a lower density than the second material. However, the first material can have a density equal to or higher than the second material if required and / or desired.

[0040] As in Fig. As shown in Figure 3, the bicycle hub assembly 10 further comprises a locking element 28 with which the first tooth 20 is secured to the mounting section 24. For example, the locking element 28 is a socket head cap screw. The mounting section 24 includes a threaded hole 30. In the illustrated embodiment, the threaded hole 30 is provided in the recess 26. The locking element 28 includes an external threaded portion 28a, which is provided to be screwed into the threaded hole 30. The first tooth 20 includes a mounting through-hole 31 through which the locking element 28 extends.

[0041] As in Fig. As shown in Figure 4, the sprocket support link 16 includes a second tooth 32 and a third tooth 34. The second tooth 32 projects radially outward from the outer peripheral surface 22 of the tubular section 18. The second tooth 32 is made of the first material. The third tooth 34 also projects from the outer peripheral surface 22 of the tubular section 18. The third tooth 34 is made of the first material. The second tooth 32 and the third tooth 34 are integrally formed with the tubular section 18 as a single unit link. The third tooth 34 is spaced from the second tooth 32 in the circumferential direction D2 of the sprocket support link 16. The fastening section 24 is positioned between the second tooth 32 and the third tooth 34 in the circumferential direction D2.

[0042] The sprocket support link 16 further includes additional second teeth 32a and additional third teeth 34a. Since each of the additional second teeth 32a has essentially the same shape as the second tooth 32, the additional second teeth 32a can be referred to as the second tooth 32. Since each of the additional third teeth 34a has essentially the same shape as the third tooth 34, the additional third teeth 34a can be referred to as the third tooth 34. Therefore, for the sake of brevity, they will not be described and / or illustrated in detail.

[0043] As in Fig. As shown in Figure 4, the sprocket support link 16 further includes additional first teeth 20a. Since the additional first teeth 20a have the same shape as the first tooth 20, they can be referred to as the first tooth 20. The tubular section 18 further includes additional mounting sections 24a. Since the additional mounting sections 24a have the same shape as the mounting section 24, they can be referred to as the mounting section 24. The additional second teeth 32a and the additional third teeth 34a are arranged alternately in the circumferential direction D2 with a constant pitch. Each of the first teeth 20 is positioned between the second teeth 32 and the third teeth 34. Each of the mounting sections 24 is positioned between the second tooth 32 and the third tooth 34.

[0044] The total number of first teeth 20 is not limited to the illustrated embodiment. For example, the sprocket support link 16 can include at least one first tooth 20, if required and / or desired. All teeth of the sprocket support link 16 can be replaced by first teeth, if required and / or desired.

[0045] As in Fig. As shown in Figure 5, a distance DS1, defined between the attachment section 24 and the second tooth 32 in the circumferential direction D2, is essentially the same as a distance DS2, defined between the attachment section 24 and the third tooth 34 in the circumferential direction D2. However, the distance DS1 can differ from the distance DS2 if required and / or desired. The distance DS1 can be defined between the first tooth 20 and the second tooth 32 in the circumferential direction D2. The distance DS2 can be defined between the first tooth 20 and the third tooth 34 in the circumferential direction D2.

[0046] As in Fig. As can be seen in Figure 5, the first tooth 20 comprises a first surface 36 and a second surface 38. The first surface 36 is designed to face a mounting section MP of the bicycle chainring SP in the circumferential direction D2 of the chainring support link 16. The second surface 38 is opposite the first surface 36 in the circumferential direction D2. The second surface 38 is designed to face the mounting section MP of the bicycle chainring SP in the circumferential direction D2.

[0047] In the illustrated embodiment, the mounting section MP includes mounting teeth MP1, which are arranged in the circumferential direction D2. The first tooth 20 is positioned between the adjacent second teeth of the mounting teeth MP1 in a state where the bicycle chainring SP is mounted to the chainring support link 16. The first surface 36 is in contact with the mounting teeth MP1 in the circumferential direction D2. The second surface 38 is in contact with other mounting teeth MP1 in the circumferential direction D2.

[0048] As in Fig. As shown in Figure 5, the fastening through-hole 31 includes a first hole 31a and a second hole 31b. The second hole 31b has an inner diameter larger than the inner diameter of the first hole 31a. The locking element 28 includes a head part 28b, which is provided at one end of the external thread part 28a. The head part 28b has an outer diameter larger than the outer diameter of the external thread part 28a. The head part 28b is fully inserted into the second hole 31b, in a state where the first tooth 20 on the tubular section 18 is secured by the locking element 28.

[0049] As in the Fig. As can be seen in figures 5 to 8, the first tooth 20 includes a tooth body 40 and a projection 42. The tooth body 40 includes the first surface 36 and the second surface 38. As shown in the Fig. 5 and Fig. As can be seen in Figure 8, the tooth body 40 has an arc shape or arc shape along the outer peripheral surface 22 of the tubular section 18 ( Fig. 5) on. As in the Fig. 5, Fig. 7 and Fig. As can be seen in figure 8, the projection 42 protrudes from the tooth body 40.

[0050] As in Fig. As can be seen in Figure 6, the fastening through-hole 31 is provided within the projection 42 when viewed from a direction parallel to a central axis A2 of the fastening through-hole 31. As shown in Fig. As can be seen in Figure 7, the fastening through hole 31 is provided on the tooth body 40 and the projection 42.

[0051] As in the Fig. 2 and Fig. As shown in Figure 5, the tooth body 40 is configured to be provided on the outer peripheral surface 22 of the tubular section 18 in a state where the first tooth 20 is attached to the tubular section 18 via the fastening section 24. The tooth body 40 is arranged radially outward from the outer peripheral surface 22 of the tubular section 18 in a state where the first tooth 20 is attached to the tubular section 18. The projection 42 is configured to be provided in the recess 26. The projection 42 is arranged radially inward from the outer peripheral surface 22 of the tubular section 18 in a state where the first tooth 20 is attached to the tubular section 18.

[0052] As in Fig. As can be seen in Figure 2, the first tooth 20 has a longitudinal axis A3 parallel to the axial direction D1, in a state in which the first tooth 20 is attached to the tubular section 18 via the recess 26 and the projection 42.

[0053] As in Fig. As shown in Figure 7, the tooth body 40 and the projection 42 extend along the longitudinal axis A3. The tooth body 40 has a first maximum axial length L11, which is defined along the longitudinal axis A3. The projection 42 has a second maximum axial length L12, which is also defined along the longitudinal axis A3. The second maximum axial length L12 is shorter than the first maximum axial length L11. However, the second maximum axial length L12 can be equal to or greater than the first maximum axial length L11, if required and / or desired.

[0054] As in Fig. As shown in Figure 2, the recess 26 has a maximum axial length L41, which is defined along the axis of rotation A1. The first maximum axial length L11 is greater than the maximum axial length L41. The second maximum axial length L12 is less than the maximum axial length L41. However, the first maximum axial length L11 can be equal to or less than the maximum axial length L41 if required and / or desired. The second maximum axial length L12 can be equal to the maximum axial length L41 if required and / or desired. Furthermore, the projection 42 can have the second maximum axial length L12, such that the projection 42 is press-fitted into the recess 26 if required and / or desired.

[0055] As in Fig. As can be seen in Figure 5, the tooth body 40 has a first maximum circumferential length L21, which is defined in the circumferential direction D2, in a state where the first tooth 20 is attached to the tubular section 18 via the recess 26 and the projection 42. The projection 42 has a second maximum circumferential length L22, which is defined in the circumferential direction D2, in a state where the first tooth 20 is attached to the tubular section 18 via the recess 26 and the projection 42. As shown in the Fig. 5 and Fig. As can be seen in Figure 8, the second maximum circumference length L22 is the same as the first maximum circumference length L21. However, the second maximum circumference length L22 can differ from the first maximum circumference length L21 if needed and / or desired.

[0056] As in Fig. As shown in Figure 5, the fastening section 24 includes a first inner surface 44 and a second inner surface 46, which is spaced apart from the first inner surface 44 in the circumferential direction D2. The projection 42 includes a first circumferential end surface 48 and a second circumferential end surface 50. The first circumferential end surface 48 is configured to face the first inner surface 44 in the circumferential direction D2. The second circumferential end surface 50 is configured to face the second inner surface 46 in the circumferential direction D2.

[0057] In the illustrated embodiment, the first maximum circumferential length L21 is defined between the first surface 36 and the second surface 38. The second maximum circumferential length L22 is defined between the first circumferential end surface 48 and the second circumferential end surface 50. The first surface 36 is substantially parallel to the second surface 38. The first circumferential end surface 48 is substantially parallel to the second circumferential end surface 50. However, the first surface 36 may be inclined relative to the second surface 38, and the first circumferential end surface 48 may be inclined relative to the second circumferential end surface 50, if required and / or desired.

[0058] In the illustrated embodiment, the first circumferential end surface 48 of the projection 42 is arranged in a plane P1, which is defined by the first surface 36 of the tooth body 40. The second circumferential end surface 50 of the projection 42 is arranged in a plane P2, which is defined by the second surface 38 of the tooth body 40.

[0059] As in Fig. As can be seen in Figure 5, the recess 26 has a maximum circumferential length L31, which is substantially equal to or greater than the second maximum circumferential length L22. In the illustrated embodiment, the first circumferential end surface 48 touches or is touchable with the first inner surface 44 in the circumferential direction D2. The second circumferential end surface 50 touches or is touchable with the second inner surface 46 in the circumferential direction D2. A gap or space may be provided between the first circumferential end surface 48 and the first inner surface 44. A gap or space may be provided between the second circumferential end surface 50 and the second inner surface 46. The first tooth 20 may be connected to the recess 26 with an adhesive material, such as an adhesive in addition to the locking element 28.The recess 26 can have a maximum circumferential length L32, such that the projection 42 is / is press-fitted into the recess 26, if required and / or desired.

[0060] As in the Fig. 2 and Fig. As can be seen in Figure 5, the tooth body 40 has a shape that is essentially the same as the shape of the second tooth 32 in the axial area AR where the mounting section MP of the bicycle chainring SP engages with the tooth body 40 and the second tooth 32. As shown in Figure 5, the tooth body 40 has a shape that is essentially the same as the shape of the second tooth 32 in the axial area AR where the mounting section MP of the bicycle chainring SP engages with the tooth body 40 and the second tooth 32. Fig. As can be seen in Figure 5, the tooth body 40 has a shape that is essentially the same as the shape of the third tooth 34 in the axial region AR where the mounting section MP of the bicycle chainring SP engages with the tooth body 40 and the third tooth 34. However, the tooth body 40 may have a shape different from the shapes of the first tooth 32 and the third tooth 34, if required and / or desired.

[0061] As in the Fig. 2 and Fig. As shown in Figure 3, the sprocket support link 16 includes a flange section 52, which projects radially outwards from the tubular section 18. The flange section 52 has an annular shape. The second tooth 32 and the third tooth 34 are coupled to the flange section 52. The first tooth 20 is spaced axially D1 away from the flange section 52. The sprocket support link 16 also includes stops 54. The stops 54 are located on the second tooth 32 and the third tooth 34. The stops 54 are positioned on an inclined surface 52a of the flange section 52. The stops 54 project from the second tooth 32 and the third tooth 34. The stops 54 project from the flange section 52. As shown in Figure 3, the sprocket support link 16 includes stops 54. Fig. As can be seen in Figure 2, the stoppers 54 are touchable with the bicycle chainring SP and define an end of the axial range AR.

[0062] The first tooth 20 can be positioned on the outer peripheral surface 22 to contact the flange section 52, if required and / or desired. The stops 54 can be provided on the first tooth 20, if required and / or desired. Furthermore, the stops 54 can be provided on the flange section 52 at a position corresponding to the first tooth 20.

[0063] In the bicycle hub assembly 10, since the first tooth 20 is made of a second material, different from the first material of the tubular section 18, the design possibilities of the bicycle hub assembly 10 can be extended by changing the materials of the first tooth 20 and the tubular section 18. Furthermore, as in the Fig. 2 and Fig. As can be seen in Figure 5, since the fastening section 24 is only provided radially inside the outer peripheral surface 22 of the tubular section 18, it is possible to simplify the structure of the bicycle hub assembly 10. Second embodiment

[0064] A bicycle hub assembly 210 according to a second embodiment is described below with reference to the Fig. 9 and Fig. The bicycle hub assembly 210 has the same configuration as the bicycle hub assembly 10 except for the chainring support link 16. Consequently, elements that have essentially the same function as those in the first embodiment are given the same reference numerals and are not described again in detail for the sake of brevity.

[0065] As in Fig. As can be seen in the bicycle hub arrangement 210, the first tooth 20 is attached to the tubular section 18 without the locking element 28 ( Fig. 3) fastened. The threaded hole 30 is omitted from the fastening section 24. The fastening through-hole 31 is omitted from the first tooth 20. In the bicycle hub assembly 210, the projection 42 is press-fitted into the recess 26.

[0066] As in Fig. As can be seen in Figure 10, the recess 26 has a maximum circumferential length L231 such that the projection 42 is / will be press-fitted into the recess 26. More specifically, the second maximum circumferential length L22 of the projection 42 is slightly greater than the maximum circumferential length L231 of the recess 26. The first circumferential end surface 48 contacts the first inner surface 44. The second circumferential end surface 50 contacts the second inner surface 46. More specifically, since the projection 42 is / will be press-fitted into the recess 26, the first circumferential end surface 48 is pressed against the first inner surface 44 and the second circumferential end surface 50 is pressed against the second inner surface 46. The first tooth 20 can be connected to the recess 26 by adhesive materials, such as adhesives, instead of or in addition to the press fit.

[0067] With the bicycle hub arrangement 210, it is possible to obtain the same advantageous effects as with the bicycle hub arrangement 10 according to the first embodiment. Third embodiment

[0068] A bicycle hub assembly 310 according to a third embodiment is described with reference to the Fig. 11 to 15 are described below. The bicycle hub assembly 310 has the same configuration as the bicycle hub assembly 10, except for the chainring support link 16. Consequently, the elements that have essentially the same functions as those in the preceding embodiments are given the same reference numerals and, for the sake of brevity, are not described again in detail.

[0069] As in Fig. As shown in Figure 11, in the bicycle hub assembly 310, the chainring support link 16 includes a first tooth 320, which is designed to be attached to the mounting section 24 of the tubular section 18. The first tooth 320 is made of the second material, different from the first material. The mounting section 24 includes a recess 326, which is provided on the outer peripheral surface 22 of the tubular section 18.

[0070] As in Fig. As can be seen in Figure 12, the first tooth 320 comprises the tooth body 40 and a projection 342. The projection 342 extends from the tooth body 40 and is designed to be positioned in the recess 326. In the bicycle hub assembly 310, the projection 342 is press-fitted into the recess 326.

[0071] As in the Fig. As can be seen in Figures 13 to 15, the projection 342 has a second maximum circumferential length L322, which is defined in the circumferential direction D2, in a state where the first tooth 320 is attached to the tubular section via the recess 326 and the projection 342. The second maximum circumferential length L322 is shorter than the first maximum circumferential length L21.

[0072] As in Fig. As can be seen in Figure 12, the recess 326 has a maximum circumferential length L331, such that the projection 342 is / is press-fitted into the recess 326. The second maximum circumferential length L322 is slightly larger than the maximum circumferential length L331.

[0073] As in the Fig. 12 and Fig. As can be seen in Figure 15, the first tooth 320 has at least a partially L-shaped cross-section along a plane perpendicular to the longitudinal axis A3. As shown in Fig. As shown in Figure 12, the tooth body 40 includes an inner peripheral surface 341, which faces the outer peripheral surface 22 of the sprocket support link 16. In the illustrated embodiment, the inner peripheral surface 341 contacts the outer peripheral surface 22 of the sprocket support link 16 in a state where the first tooth 320 is attached to the tubular section 18. The inner peripheral surface 341 can be bonded to the outer peripheral surface 22 of the sprocket support link 16 with an adhesive material. The attachment section 24 includes a first inner surface 344. The projection 342 includes a first circumferential end surface 348, which is configured to face the first inner surface 344 in the circumferential direction D2. In the illustrated embodiment, the first circumferential end surface 348 touches the first inner surface 344. The second circumferential end surface 50 touches the second inner surface 46.More specifically, since the projection 342 is / will be press-fitted into the recess 326, the first circumferential end surface 348 is pressed against the first inner surface 344, and the second circumferential end surface 50 is pressed against the second inner surface 46. The first tooth 320 can be joined into the recess 326 by or with adhesive materials such as adhesives instead of or in addition to the press fit.

[0074] As in Fig. As can be seen in Figure 12, the inner peripheral surface of the tooth body 40 and the first circumferential end surface 348 of the projection 342 are positioned on a downstream side of the projection 342 in a drive rotation direction D21 of the sprocket support link 16. The inner peripheral surface 341 of the tooth body 40 is substantially perpendicular to the first circumferential end surface 348 of the projection 342. The drive rotation direction D21 is defined as the direction in which the sprocket support link 16 rotates during pedaling or riding. The drive rotation direction D21 corresponds to a direction of the circumferential direction D2.

[0075] With the bicycle hub arrangement 310, it is possible to achieve the same advantageous effects as with the bicycle hub arrangement 10 according to the first embodiment. Fourth embodiment

[0076] A bicycle hub assembly 410 according to a fourth embodiment is described below with reference to the Fig. The bicycle hub assembly 410 has the same configuration as the hub assembly 10, except for the chainring support link 16. Consequently, the elements that have essentially the same functions as those in the preceding embodiments are given the same reference numerals and are not described again in detail for the sake of brevity.

[0077] As in Fig. As shown in Figure 16, in the bicycle hub assembly 410, the sprocket support link 16 comprises the tubular section 18 and a first tooth 420. The first tooth 420 is designed to be attached to the mounting section 24 of the tubular section 18. The first tooth 420 is made of a second material different from the first. The mounting section 24 includes a plurality of recesses 426 and 427, which are provided on the outer peripheral surface 22 of the tubular section 18. The first tooth 420 includes the tooth body 40 and a plurality of projections 442 and 443. The plurality of projections 442 and 443 project from the tooth body 40.

[0078] The recesses 426 and 427 are spaced apart from each other in the axial direction D1. The projections 442 and 443 are spaced apart from each other in the axial direction D1. The number of recesses is not limited to the illustrated embodiment. The number of projections is also not limited to the illustrated embodiment. The first tooth 420 is secured to the tubular section 18 by the retaining ring 28.

[0079] As in the Fig. 17 and Fig. As can be seen in Figure 18, the projections 442 and 443 are designed to be arranged in the plurality of recesses 4426 and 427. The first tooth 420 is secured to the tubular section 18 by the locking element 28 in a state where the projections 442 and 443 are arranged in the recesses 426 and 427. Each of the recesses 426 and 427 includes the first inner surface 44 and the second inner surface 46. Each of the projections 442 and 443 includes the first circumferential end surface 48 and the second circumferential end surface 50.

[0080] As in the Fig. As can be seen in Figure 19, the fastening through-hole 31 is provided within the projection 442 when viewed from a direction parallel to the central axis A2 of the fastening through-hole 31. As shown in Fig. As can be seen in Figure 20, the fastening through hole 31 is provided in the tooth body 40 and the projection 442.

[0081] As in Fig. As can be seen in Figure 20, the projections 442 and 443 have second maximum axial lengths L412 and L413, which are defined along the longitudinal axis A3. Each of the second maximum axial lengths L412 and L413 is shorter than the first maximum axial length L11. In the illustrated embodiment, the second maximum axial length L412 is equal to the second maximum axial length L413. However, the second maximum axial length L412 can differ from the second maximum axial length L413.

[0082] As in the Fig. 17 and Fig. As can be seen in Figure 18, the projections 442 and 443 have second maximum circumferential lengths L422 and L423, which are defined in the circumferential direction D2, in a state where the first tooth 420 is attached to the tubular section 18 via the recesses 426 and 427 and the projections 442 and 443. As shown in the Fig. 17, Fig. 18 and Fig. As can be seen in Figure 21, each of the second maximum circumference lengths L422 and L423 is equal to the first maximum circumference length L21. However, at least one of the second maximum circumference lengths L422 and L423 can differ from the first maximum circumference length L21.

[0083] With the bicycle hub arrangement 410, it is possible to achieve the same advantageous effects as with the bicycle hub arrangement 10 according to the first embodiment. Fifth embodiment

[0084] A bicycle hub assembly 510 according to a fifth embodiment is described below with reference to the Fig. 22 to 25. The bicycle hub assembly 510 has the same configuration as the hub assembly 10 except for the chainring support link 16. Consequently, the elements which have essentially the same functions as those of the preceding embodiments are given the same reference numerals and are not described again in detail for the sake of brevity.

[0085] As in Fig. As can be seen in the bicycle hub assembly 510, the chainring support link 16 includes a first tooth 520, which is designed to be attached to the mounting section 24 of the tubular section. The first tooth 520 is made of a different material than the first. The mounting section 24 includes a recess 526, which is provided on the outer peripheral surface 22 of the tubular section 18.

[0086] As in the Fig. As shown in Figure 23, the first tooth 520 comprises the tooth body 40 and a projection 542. The projection 542 extends from the tooth body 40 and is designed to be positioned in the recess 526. The projection 542 has a second maximum circumferential length L522, defined in the circumferential direction D2, in a state where the first tooth 520 is attached to the tubular section 18 via the recess 526 and the projection 542. The second maximum circumferential length L522 is shorter than the first maximum circumferential length L21.

[0087] As in the Fig. 23 and Fig. As can be seen in Figure 26, the first tooth 520 has at least a partially T-shaped cross-section along a plane perpendicular to the longitudinal axis A3. The tooth body 40 includes an inner peripheral surface 541, which faces the outer peripheral surface 22 of the sprocket support link 16. In the illustrated embodiment, the inner peripheral surface 541 contacts the outer peripheral surface 22 of the sprocket support link 16 in a state where the first tooth 520 is attached to the tubular section 18. The inner peripheral surface 541 can be bonded to the outer peripheral surface 22 of the sprocket support link 16 with an adhesive material, if required and / or desired.

[0088] As in Fig. As can be seen in Figure 23, the recess 526 has a maximum circumferential length L531, which is essentially equal to or greater than the second maximum circumferential length L522. The first tooth 520 can be connected to the recess 526 with adhesive materials such as adhesives in addition to the retaining ring 28. The recess 526 can have a maximum circumferential length L31 such that the projection 542 is press-fitted into the recess 526, if required and / or desired.

[0089] As in Fig. As can be seen in Figure 24, the fastening through-hole 31 is provided within the projection 542 when viewed from a direction parallel to the central axis A2 of the fastening through-hole 31. As shown in Fig. As can be seen in Figure 25, the fastening through hole 31 is provided on the tooth body 40 and the projection 542.

[0090] As in Fig. As can be seen in Figure 23, the inner peripheral surface 541 of the tooth body 40 and the first circumferential end surface 48 of the projection 542 are positioned on a downstream side of the projection 542 with respect to the drive direction D21 of the sprocket support link 16. The inner peripheral surface 541 of the tooth body 40 is substantially perpendicular to the first circumferential end surface 48 of the projection 542.

[0091] The same advantageous effects can be achieved with the bicycle hub arrangement 510 as with the bicycle hub arrangement 10 according to the first embodiment. Sixth embodiment

[0092] A bicycle hub assembly 610 according to a sixth embodiment is described below with reference to the Fig. 27 and Fig. 28 described. The bicycle hub assembly 620 has the same configuration as the hub assembly 10, except for the chainring support link 16. Consequently, the elements which have essentially the same function as the preceding embodiments are given the same reference numerals and are not described again in detail for the sake of brevity.

[0093] As in Fig. As shown in Figure 27, in the bicycle hub assembly 610, the sprocket support link 16 includes a first tooth 620, which is designed to be attached to the mounting section 24 of the tubular section 18. The first tooth 620 is made of a second material different from the first. The bicycle hub assembly 610 includes a locking element 628, which secures the first tooth 620 to the mounting section 24. The mounting section 24 includes a threaded hole 630. The bicycle hub assembly 610 also includes a locking element 629, which secures the first tooth 620 to the mounting section 24. The fastening section 24 includes a threaded hole 633. In the illustrated embodiment, the locking element 629 has essentially the same shape as the locking element 628. The threaded hole 633 has essentially the same shape as the threaded hole 630.

[0094] As in Fig. As can be seen in Figure 28, the first tooth 620 includes the tooth body 40, but does not include the projections as described in the preceding embodiments. The locking element 628 includes an external threaded portion 628a, which is configured to be screwed into the threaded hole 630. The locking element 629 includes an external threaded portion 629a, which is configured to be screwed into the threaded hole 633.

[0095] The first tooth 620 includes a fastening through-hole 631 through which the locking element 628 extends. For example, the locking element 628 is a countersunk bolt and the fastening through-hole 631 includes a tapered surface 631a. The locking element 628 includes a head section 628b, which is provided at one end of the external threaded part 628a. The head section 628b is provided within the fastening through-hole 631.

[0096] The first tooth 620 includes a fastening through-hole 635 through which the locking element 629 extends. For example, the locking element 629 is a countersunk bolt, and the fastening through-hole 635 includes a tapered surface 635a. The locking element 629 includes a head section 629b, which is provided at one end of the external threaded portion 629a. The head section 629b is provided within the fastening through-hole 635. The locking element 629 has essentially the same shape as the locking element 628. The fastening through-hole 635 has essentially the same shape as the fastening through-hole 631.

[0097] The tooth body 40 includes an inner peripheral surface 641, which faces the outer peripheral surface 22 of the sprocket support link 16. In the illustrated embodiment, the inner peripheral surface 641 contacts the outer peripheral surface 22 of the sprocket support link 16 in a state where the first tooth 620 is attached to the tubular section 18. The inner peripheral surface 641 can be connected to the outer peripheral surface 22 of the sprocket support link 16 by adhesive materials, if required and / or desired.

[0098] With the bicycle hub arrangement 610, it is possible to achieve the same advantageous effects as with the bicycle hub arrangement 10 according to the first embodiment.

[0099] From the present disclosure, it will be apparent to the person skilled in the art in the field of bicycles that the designs of the foregoing embodiments can be combined with each other, at least partially, if required and / or desired.

[0100] In the present invention, the term “attached” or “fastening,” as used herein, encompasses configurations in which one element is directly attached to another by means of direct attachment of the element to the other element; configurations in which the element is indirectly attached to the other element, such as the intermediate member in this case; and configurations in which one element is integrally formed with another element, i.e., one element is substantially part of the other element. This concept is also applied to words with similar meanings, for example, “connected,” “joined,” “coupled,” “mounted,” “glued,” “fixed,” and their derivatives.

[0101] The term "comprehensive" and its derivatives, as used herein, are to be understood as open terms that specify the presence of the mentioned features, elements, components, groups, integers, and / or steps, but do not exclude the presence of other unmentioned features, elements, components, groups, integers, and / or steps. The foregoing also applies to words with similar meanings, such as "exhibit," "include," and their derivatives.

[0102] Furthermore, the terms “link”, “section”, “section”, “part” or “element”, when used in the singular, can have the plural meaning of a single element or a multitude of elements.

[0103] The ordinal numbers, such as "first" and "second" as cited in the present application, are merely identifiers and have no other meaning, such as indicating a particular order or anything similar. Furthermore, the term "first element," for example, does not imply the existence of a "second element," and the term "second element" itself does not imply the existence of a "first element."

[0104] The term “a pair of”, as used herein, includes the configuration in which a pair of elements have different shapes or structures from each other, in addition to the configurations in which the pair of elements have the same shapes or structures from each other.

[0105] Finally, the terms of magnitude, such as "essentially", "by" and "approximately", as used herein, mean a reasonable amount of deviation of the modified term such that the final result is not significantly altered.

Claims

[1] Bicycle hub assembly (10) comprising: a hub shaft (12); a hub shell (14) which is rotatable relative to the hub shaft (12) about an axis of rotation (A1); and a sprocket support link (16) which is rotatable relative to the hub shaft (12) about the axis of rotation (A1) and is designed to support a bicycle sprocket (SP) in order to be integrally rotatable with the sprocket support link (16) about the axis of rotation (A1), wherein the sprocket support link (16) comprises: a tubular section (18) comprising an outer circumferential surface (22) and a fastening section (24) which is provided only radially inside the outer circumferential surface (22), wherein the tubular section (18) is made of a first material; and a first tooth (20) which is designed to be attached to the fastening section (24) of the tubular section (18) and which is made of a second material different from the first material, wherein the first tooth (20) comprises: a first surface (36) which is designed to face a mounting section (MP) of the bicycle chainring (SP) in a circumferential direction (D2) of the chainring support link (16); and a second surface (38) opposite the first surface (36) in the circumferential direction (D2), wherein the second surface (38) is designed to face the mounting section (MP) of the bicycle chainring (SP) in the circumferential direction (D2); wherein the first tooth (20) has a longitudinal axis (A3) which is parallel to the axial direction (D1), in a state in which the first tooth (20) is attached to the tubular section (18) via the fastening section (24), and the first tooth (20) has at least partially a substantially L-shaped cross-section along a plane which is perpendicular to the longitudinal axis (A3). [2] Bicycle hub assembly (10) according to claim 1, wherein the fastening section (24) includes a recess (26) which is provided on the outer circumferential surface (22) of the tubular section (18), and the first tooth (20) includes a tooth body (40) comprising the first surface (36) and the second surface (38), wherein the tooth body (40) is configured to be provided on the outer circumferential surface (22) of the tubular section (18) in a state in which the first tooth (20) is attached to the tubular section (18) via the fastening section (24), and a projection (42) which extends from the tooth body (40) and is designed to be positioned in the recess (26). [3] Bicycle hub assembly (10) according to claim 2, wherein the recess (26) extends in an axial direction (D1) parallel to the axis of rotation (A1) and / or has a maximum circumferential length (L32) such that the projection (42) is press-fitted into the recess (26). [4] Bicycle hub assembly (10) according to claim 2 or 3, wherein the first tooth (20) has a longitudinal axis (A3) parallel to the axial direction (D1), in a state in which the first tooth (20) is attached to the tubular section (18) via the recess (26) and the projection (42) and the tooth body (40) and the projection (42) extend along the longitudinal axis (A3). [5] Bicycle hub assembly (10) according to claim 4, wherein the tooth body (40) has a first maximum axial length (L11) defined along the longitudinal axis (A3), the projection (42) has a second maximum axial length (L12) defined along the longitudinal axis (A3), and the second maximum axial length (L12) is shorter than the first maximum axial length (L11). [6] Bicycle hub assembly (10) according to one of claims 2 to 5, wherein the tooth body (40) has a first maximum circumferential length (L21) defined in the circumferential direction (D2), in a state in which the first tooth (20) is attached to the tubular section (18) via the recess (26) and the projection (42), the projection (42) has a second maximum circumferential length (L22) defined in the circumferential direction (D2), in a state in which the first tooth (20) is attached to the tubular section (18) via the recess (26) and the projection (42), and the second maximum circumferential length (L22) is shorter than or equal to the first maximum circumferential length (L21). [7] Bicycle hub assembly (10) according to one of claims 2 to 6, wherein the fastening section (24) comprises a first inner surface (44) and a second inner surface (46) spaced apart from the first inner surface (44) in the circumferential direction (D2) and the lead (42) includes a first circumferential end surface (48) which is designed to face the first inner surface (44) in the circumferential direction (D2), and a second circumferential end surface (50) which is designed to face the second inner surface (46) in the circumferential direction (D2). [8] Bicycle hub arrangement (10) according to claim 7, wherein the first circumferential end surface (48) of the projection (42) is arranged in a plane (P1) defined by the first surface (36) of the tooth body (40), and the second circumferential end surface (50) of the projection (42) is arranged in a plane (P2) defined by the second surface (38) of the tooth body (40). [9] Bicycle hub assembly (10) according to one of claims 2 to 8, in which the tooth body (40) includes an inner circumferential surface (341; 541; 641) which faces the outer circumferential surface (22) of the chain wheel support link (16), the fastening section (24) includes a first inner surface (44), the projection (42) includes a first circumferential end surface (48) which is designed to face the first inner surface (44) in the circumferential direction (D2), and the inner peripheral surface (341; 541; 641) of the tooth body (40) and the first circumferential end surface (48) of the projection (42) are positioned in a downstream side of the projection (42) in a drive rotation direction (D21) of the sprocket support link (16), in particular The inner peripheral surface (341; 541; 641) of the tooth body (40) is essentially perpendicular to the first circumferential end surface (48) of the projection (42). [10] Bicycle hub assembly (10) according to one of claims 1 to 9, in which the chain wheel support member (16) includes a second tooth (32) which projects radially outwards from the outer peripheral surface (22) of the tubular section (18) and is made of a first material, and the tooth body (40) has a shape which is essentially the same as a shape of the second tooth (32) in an axial area (AR) in which the mounting section (MP) of the bicycle chain wheel (SP) engages with the tooth body (40) and the second tooth (32). [11] Bicycle hub assembly (10) according to one of claims 1 to 10, wherein the fastening section (24) includes a plurality of recesses (426, 427) which are provided on the outer peripheral surface (22) of the tubular section (18), and the first tooth (20) includes a tooth body (40) comprising the first surface (36) and the second surface (38), wherein the tooth body (40) is configured to be provided on the outer peripheral surface (22) of the tubular section (18) in a state in which the first tooth (20) is attached to the tubular section (18) via the attachment section (24), and a multitude of projections (442, 443) which project from the tooth body (40) and are designed to be arranged in the multitude of recesses (426, 427). [12] Bicycle hub assembly (10) according to any one of claims 1 to 11, further comprising: a locking element (28) with which the first tooth (20) is secured to the fastening section (24). [13] Bicycle hub assembly (10) according to claim 12, wherein the fastening section (24) includes a threaded hole (30) and the locking element (28) includes an external threaded part (28a) which is designed to be screwed into the threaded hole (30). [14] Bicycle hub arrangement (10) according to any one of claims 1 to 13, wherein the first material has a hardness lower than the hardness of the second material. [15] Bicycle hub assembly (10) according to any one of claims 1 to 14, wherein the first material comprises an aluminum alloy and the second material comprises an iron alloy. [16] Bicycle hub assembly (10) according to one of claims 1 to 15, wherein the chain wheel support link (16) includes a second tooth (32) which projects radially outwards from the outer peripheral surface (22) of the tubular section (18) and is made of a first material and a third tooth (34) which projects radially outwards from the outer peripheral surface (22) of the tubular section (18) and is made of the first material, wherein the third tooth (34) is spaced apart from the second tooth (32) in the circumferential direction (D2), and the fastening section (24) is provided between the second tooth (32) and the third tooth (34) in the circumferential direction (D2). [17] Bicycle hub arrangement (10) according to claim 16, wherein a distance defined between the fastening section (24) and the second tooth (32) in the circumferential direction (D2) is substantially equal to a distance defined between the fastening section (24) and the third tooth (34) in the circumferential direction (D2).

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