bicycle sprocket

Abstract

Bicycle sprocket (S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11) comprising: a sprocket body (14), including a radial outer circumference (18), provided about a rotational center axis (A1) of the bicycle sprocket (S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11); a shifting aid area (22) for simplifying a shifting operation of the bicycle chain (C), wherein the shifting aid area (22) has a shifting aid recess (24); and a plurality of chain drive teeth (16) provided on the radial outer circumference (18) for engagement with a bicycle chain (C), wherein the plurality of chain drive teeth (16) comprises: a reference tooth (34) provided in the shifting aid area (22), wherein the reference tooth (34) has a reference radial length (L2) defined radially outward from a base circle (RC) of the bicycle sprocket (S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11); and a first tooth (36) provided in the shifting aid area (22),wherein the first tooth (36) has a first radial length (L1) defined radially outwards from the base circle (RC) of the bicycle sprocket (S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11), the first radial length (L1) is greater than the reference radial length (L2), the first tooth (36) is adjacent to the reference tooth (34) in a direction of rotation (D1) defined about the axis of rotation (A1) without any further tooth between the first tooth (36) and the reference tooth (34), the first tooth (36) is / is provided on a subordinate side of the reference tooth (34) in a drive direction of rotation (D11) in which the bicycle sprocket (S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11) is / is rotated about the axis of rotation (A1) during pedaling, and the The switching aid recess (24) extends at least from the reference tooth (34) to the first tooth (36), wherein the first tooth (36) includes a first subordinate tooth base (34A),a first upstream tooth root (34B) provided on the radial outer circumference (18) of the gear body (14) for defining the base circle (RC), a first downstream circumferential surface (36C) facing in a drive direction of rotation (D11), wherein the first downstream circumferential surface (36C) extends from the first downstream tooth root (34A) to a first downstream radial outer end (36G) of the first tooth (36), a first upstream circumferential surface (36D) facing in a reverse direction of rotation opposite to the drive direction of rotation (D11), wherein the first upstream circumferential surface (36D) extends from the first upstream tooth root (34B) to a first upstream radial outer end (36H) of the first tooth (36), a first downstream outer corner (36E), provided at the first subordinate radial outer end (36G) in the first subordinate circumferential surface (36C),and a first prior outer corner (36F) provided at the first prior radial outer end (36H) in the first prior circumferential surface (36D), wherein the first prior outer corner (36F) is / will be positioned radially outwards from the first prior outer corner (36E).

Description

BACKGROUND OF THE INVENTION REFERENCE TO OTHER APPLICATIONS

[0001] This application claims priority over US patent application 15 / 265,808, filed on September 14, 2016. The entire disclosure of US patent application 15 / 265,808 is hereby included by reference. AREA OF INVENTION

[0002] The present invention relates to a bicycle sprocket or a bicycle chainring. EXPLANATION OF THE BACKGROUND

[0003] Cycling is an increasingly popular form of leisure activity and a means of transportation. Moreover, cycling has become a very popular competitive sport for both amateurs and professionals. Regardless of whether the bicycle is used for leisure, transportation, or competition, the bicycle industry is constantly improving the various components of the bicycle. One bicycle component that has been extensively redesigned is the sprocket. OVERVIEW OF THE INVENTION

[0004] According to one aspect of the present invention, a bicycle sprocket comprises a sprocket body, a shifting aid area, and a plurality of chain drive teeth. The sprocket body includes a radial outer circumference provided about a rotational center axis of the bicycle sprocket. The shifting aid / assist / assist area is / is designed to simplify a shifting operation of the bicycle chain. The shifting aid area has a shifting aid / assist / assist recess. The plurality of chain drive teeth are / are provided on the radial outer circumference for engagement with a bicycle chain. The plurality of chain drive teeth comprises a reference tooth and a first tooth. The reference tooth is / is provided in the shifting aid area. The reference tooth has a reference radial length defined radially outward from a base circle or root circle of the bicycle sprocket. The first tooth is / is provided in the shifting aid area.The first tooth has a first radial length, defined radially outward from the base circle of the bicycle sprocket. The first radial length is greater than the reference radial length. The first tooth is adjacent to the reference tooth in a direction of rotation defined about the central axis, without any other tooth between the first tooth and the reference tooth. The first tooth is / is provided on a downstream side of the reference tooth in a drive direction of rotation in which the bicycle sprocket is / is rotated about the central axis during pedaling. The shifting aid recess extends at least from the reference tooth to the first tooth.

[0005] With the bicycle sprocket, as described above, it is possible to delay the point at which the first tooth disengages from the chain compared to the reference tooth, since the radial length of the first tooth is greater than the reference tooth's radial length. This shifts the disengagement position, where the first tooth disengages from the chain, from a position where the axial force applied by the chain to the first tooth is greater than during pedaling. This can reduce the axial force applied by the chain to the first tooth when the chain disengages from the sprocket to an adjacent sprocket. Therefore, a smooth shifting process of the chain is possible.

[0006] Preferably, the first radial length is larger than the reference radial length by a radial length in a range of 0.5 mm to 1.0 mm.

[0007] Therefore, a smooth design of the shifting process of the bicycle chain is certainly possible.

[0008] Preferably, the first tooth includes a first downstream tooth root, a first upstream tooth root, a first downstream circumferential surface, a first upstream circumferential surface, a first downstream outer corner, and a first upstream outer corner. The first downstream tooth root can be provided on the radial outer circumference of the gear body to define the base circle. The first upstream tooth root can be provided on the radial outer circumference of the gear body to define the base circle. The first downstream circumferential surface can be oriented in the direction of rotation of the drive. The first downstream circumferential surface can extend from the first downstream tooth root to a first downstream radial outer end of the first tooth. The first upstream circumferential surface can be oriented in a reverse direction of rotation, opposite to the direction of rotation of the drive.The first prior circumferential surface can extend from the first prior tooth base to a first prior radial outer end of the first tooth. The first prior outer corner can be provided at the first prior radial outer end in the first prior circumferential surface. The first prior outer corner can be provided at the first prior radial outer end in the first prior circumferential surface. The first prior outer corner can be positioned radially outward from the first prior outer corner.

[0009] A reduction in axial force is therefore possible, applied by the bicycle chain at the first tooth during the shifting process, saving weight of the bicycle sprocket compared to a case in which the first upstream outer corner is / will be positioned radially inwards from the first downstream outer corner.

[0010] Preferably, the first subordinate external corner encloses a first subordinate curved edge having a first subordinate radius of curvature. The first subordinate external corner may enclose a first subordinate curved edge having a first subordinate radius of curvature. The first subordinate radius of curvature may be different from the first subordinate radius of curvature.

[0011] Therefore, it is possible to improve the design flexibility of the bicycle sprocket.

[0012] Preferably, the first prior radius of curvature is larger than the first subsequent radius of curvature.

[0013] Therefore, an effective reduction of the axial force applied by the bicycle chain to the first tooth during the shifting process is possible, while saving weight on the bicycle sprocket.

[0014] Preferably, the first prior radius of curvature lies in a range of 0.5 mm to 3.0 mm.

[0015] Therefore, a smooth design of the shifting process of the bicycle chain is certainly possible while saving weight on the bicycle sprocket.

[0016] Preferably, the first tooth includes a first radial outer end, defined by the first upstream radial outer end and the first downstream radial outer end as extending between the first upstream outer corner and the first downstream outer corner.

[0017] Therefore, it is possible to provide the necessary strength of the first tooth without reducing the axial force applied by the bicycle chain to the first tooth during the shifting process.

[0018] Preferably, the first radial length is / is defined radially between the base circle and the first prior outer corner.

[0019] Therefore, a smoother design of the shifting process of the bicycle chain is possible with greater certainty while saving weight on the bicycle sprocket.

[0020] Preferably, the bicycle sprocket further comprises a first side surface and a second side surface. The first side surface can be oriented in a first axial direction, parallel to the axis of rotation. The second side surface can be oriented in a second axial direction, which is an axial reversal with respect to the first axial direction. The shifting aid area can be arranged on the first side surface.

[0021] Therefore, even smoother shifting of the bicycle chain from the bicycle sprocket to the adjacent sprocket is possible.

[0022] The multiple chain drive teeth include a second tooth, provided in the shifting aid area. This second tooth may have a second radial length, defined radially outward from the base circle. This second radial length may be greater than the reference radial length.

[0023] Therefore, a delay in the timing of the second tooth disengaging from the chain is possible compared to the reference tooth, since the first radial length of the second tooth is greater than the reference radial length of the reference tooth. This shifts the disengagement position, where the second tooth disengages from the chain, from a position where the axial force applied by the chain to the second tooth is greater than during the disengagement position while pedaling. This can reduce the axial force applied by the chain to the second tooth when the chain disengages from the chainring to an adjacent sprocket. Therefore, even smoother shifting of the chain from the chainring to the adjacent sprocket is possible.

[0024] Preferably, the second radial length is equal to the first radial length.

[0025] Therefore, a smooth design of the shifting process of the bicycle chain is effectively possible.

[0026] Preferably, the second radial length is larger than the reference radial length by a radial length in a range of 0.5 mm to 1.0 mm.

[0027] Therefore, a smooth design of the shifting process of the bicycle chain is certainly possible.

[0028] Preferably, the second tooth is / is provided on a downstream side of the first tooth in a drive direction of rotation in which the bicycle sprocket is / is rotated around the axis of rotation during pedaling.

[0029] Therefore, a smooth design of the shifting process of the bicycle chain is effectively possible.

[0030] Preferably, the second tooth is adjacent to the first tooth in the direction of rotation without any further tooth between the reference tooth and the second tooth.

[0031] Therefore, a smoother design of the shifting process of the bicycle chain is possible even more effectively.

[0032] Preferably, the second tooth includes a second downstream tooth base, a second upstream tooth base, a second downstream circumferential surface, a second upstream circumferential surface, a second downstream outer corner, and a second upstream outer corner. The second downstream tooth base can be provided on the radial outer circumference of the gear body to define the base circle. The second upstream tooth base can be provided on the radial outer circumference of the gear body to define the base circle. The second downstream circumferential surface can be oriented in the direction of rotation of the drive. The second downstream circumferential surface can extend from the second downstream tooth base to a second downstream radial outer end of the second tooth. The second upstream circumferential surface can be oriented in a reverse direction of rotation, opposite to the direction of rotation of the drive.The second prior circumferential surface can extend from the second prior tooth base to a second prior radial outer end of the second tooth. The second prior outer corner can be provided at the second prior radial outer end of the second prior circumferential surface. The second prior outer corner can be positioned radially outward from the second prior outer corner.

[0033] A reduction in axial force is therefore possible, applied by the bicycle chain at the second tooth during the shifting process, saving weight of the bicycle sprocket compared to a case in which the second upstream outer corner is / will be positioned radially inwards from the second downstream outer corner.

[0034] Preferably, the second subordinate outer corner encloses a second subordinate curved edge having a second subordinate radius of curvature. The second subordinate outer corner may enclose a second subordinate curved edge having a second subordinate radius of curvature. The second subordinate radius of curvature may be different from the second subordinate radius of curvature.

[0035] Therefore, it is possible to improve the design flexibility of the bicycle sprocket.

[0036] Preferably, the second prior radius of curvature is larger than the second subsequent radius of curvature.

[0037] Therefore, an effective reduction of the axial force applied by the bicycle chain to the second tooth during the shifting process is possible, while saving weight on the bicycle sprocket.

[0038] Preferably, the second prior radius of curvature lies in a range of 0.5 mm to 3.0 mm.

[0039] Therefore, a smooth design of the shifting process of the bicycle chain is certainly possible while saving weight on the bicycle sprocket.

[0040] Preferably, the second tooth includes a second radial outer end, defined by the second upstream radial outer end and the second downstream radial outer end as extending between the second upstream outer corner and the second downstream outer corner.

[0041] Therefore, it is possible to provide the necessary strength of the second tooth without reducing the axial force applied by the bicycle chain to the second tooth during the shifting process.

[0042] Preferably, the second radial length is / is defined radially between the base circle and the second preceding outer corner.

[0043] Therefore, a smoother design of the shifting process of the bicycle chain is possible with greater certainty while saving weight on the bicycle sprocket.

[0044] Preferably, the shifting aid area includes an upshifting aid area to simplify an upshifting process from the bicycle sprocket to a smaller sprocket adjacent to the bicycle sprocket without another sprocket between the smaller sprocket and the bicycle sprocket in the axial direction.

[0045] Therefore, a smooth shifting process of the bicycle chain is possible.

[0046] Preferably, the shifting aid area includes a downshifting aid area to simplify downshifting from a smaller sprocket to the bicycle sprocket. The smaller sprocket is preferably adjacent to the bicycle sprocket without any further sprocket between the smaller sprocket and the bicycle sprocket in the axial direction.

[0047] Therefore, a smooth downshifting process of the bicycle chain is possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] A more complete appreciation of the invention and many of its expected advantages will be easily achieved by a better understanding of it with reference to the following detailed description when viewed in conjunction with the accompanying drawings.

[0049] Fig. Figure 1 is a perspective view of a bicycle multi-gear sprocket arrangement, including a bicycle sprocket according to a first embodiment.

[0050] Fig. Figure 2 is a front elevation view of the bicycle's multi-sprocket assembly.

[0051] Fig. 3 is a side elevation view of the bicycle sprocket of the bicycle multi-sprocket assembly, shown in Fig. 1.

[0052] Fig. 4 is another side elevation view of the bicycle sprocket of the bicycle multi-sprocket arrangement, shown in Fig. 1.

[0053] Fig. Figure 5 is a perspective view of the bicycle sprocket of the bicycle multi-sprocket arrangement, shown in Fig. 1.

[0054] Fig. Figure 6 is another perspective view of the bicycle sprocket of the bicycle multi-sprocket arrangement, shown in Fig. 1.

[0055] Fig. Figure 7 is a top view of the bicycle sprocket of the bicycle multi-sprocket assembly, shown in Fig. 1.

[0056] Fig. Figure 8 is a side elevation partial view of the bicycle sprocket of the bicycle multi-sprocket assembly, shown in Fig. 1.

[0057] Fig. Figure 9 is an enlarged side elevation partial view of the first tooth of the bicycle sprocket, shown in Fig. 1.

[0058] Fig. Figure 10 is an enlarged side elevation partial view of a reference tooth of the bicycle sprocket, shown in Fig. 1.

[0059] Fig. Figure 11 is an enlarged side elevation partial view of a second tooth of the bicycle sprocket, shown in Fig. 1.

[0060] Fig. Figure 12 is an enlarged side elevation partial view of an additional reference tooth of the bicycle sprocket, shown in Fig. 1.

[0061] Fig. 13 is a perspective partial view of the bicycle sprocket of the bicycle multi-sprocket arrangement, shown in Fig. 1.

[0062] Fig. 14 is another perspective partial view of the bicycle sprocket of the bicycle multi-sprocket arrangement, shown in Fig. 1.

[0063] Fig. Figure 15 is a side elevation partial view of the bicycle sprocket of the bicycle multi-sprocket arrangement, shown in Fig. 1.

[0064] Fig. Figure 16 is a side elevation partial view of the bicycle sprocket to show an upshifting process.

[0065] Fig. Figure 17 is another side elevation partial view of the bicycle sprocket to show an upshifting process.

[0066] Fig. Figure 18 is a top view of the bicycle sprocket to show an upshifting process. DESCRIPTION OF THE EXECUTION FORMS

[0067] The embodiment(s) will now be described with reference to the accompanying figures, where the same reference numerals denote corresponding or identical elements in the different drawings. First embodiment

[0068] Initially referring to Fig. 1, a bicycle multiple sprocket arrangement including a bicycle sprocket according to a first embodiment 10 The bicycle multi-sprocket arrangement is shown. 10 is / will be designed to engage with a bicycle chain C. In this embodiment, the bicycle multi-sprocket assembly comprises 10 Eleven bicycle sprockets S1 to S11. The bicycle multi-sprocket arrangement 10 has a rotational center axis A1. The bicycle multi-gear arrangement 10It is rotatable about the axis of rotation A1 in a drive direction D11 during pedaling. The drive direction D11 is / is defined along a direction of rotation D1 of the bicycle's multi-sprocket assembly. 10 .

[0069] As can be seen in Fig. 1, includes the bicycle multiple sprocket arrangement 10 further a hub intervention structure 12 designed for intervention with a bicycle hub arrangement 2 ( Fig. 2) While the bicycle multi-sprocket arrangement 10 A bicycle rear sprocket assembly (in the illustrated embodiment), structures of the bicycle multi-sprocket assembly can be 10 These components are used in a front sprocket arrangement, if required and / or desired. Each of the bicycle sprockets S1 to S11 is a rear sprocket in this embodiment, and the structures of S1 to S11 can be used in a front sprocket.

[0070] In the present application, the directional terms "front", "back", "forward", "backward", "left", "right", "across", "upward", and "downward", as well as any other similar directional terms, denote directions determined on the basis of a user (e.g., a cyclist) sitting on a bicycle saddle (not shown) and facing the handlebars (not shown). Similarly, these terms, as used to describe the bicycle's multiple sprocket arrangement, are intended to 10 or the bicycle sprockets S1 to S11, understood in relation to a bicycle 10 , which is / will be equipped with the bicycle multi-sprocket arrangement 10 or the bicycle sprockets S1 to S11, as used in an upright riding position on a horizontal surface.

[0071] As can be seen in Fig. 2. The bicycle sprockets S1 to S11 are / will be arranged in an axial direction D2, parallel to the axis of rotation A1. The bicycle sprockets S1 to S11 are / will be spaced apart from each other in the axial direction D2. The bicycle multi-sprocket arrangement 10 Includes spacers P1 to P10. Each of the spacers P1 to P10 is / will be arranged between two adjacent sprockets of the bicycle sprockets S1 to S11. Instead of such spacers, a sprocket support member can also be used, on which a plurality of bicycle sprockets are / will be mounted.

[0072] The bicycle sprocket S1 has the largest outer diameter among the bicycle sprockets S1 to S11. The bicycle sprocket S11 has the smallest outer diameter among the bicycle sprockets S1 to S11. The bicycle sprocket S1 is closer to a bicycle center plane CP of a bicycle frame (not shown) than the bicycle sprocket S11 in a state where the bicycle multiple sprocket arrangement 10 It is / will be mounted on the bicycle hub assembly 2 For example, upshifting occurs when the bicycle chain C is shifted by a rear derailleur (not shown) from a larger sprocket to an adjacent smaller sprocket in an upshifting direction D31. Downshifting occurs when the bicycle chain C is shifted by the rear derailleur from a smaller sprocket to an adjacent larger sprocket in a downshifting direction D32.

[0073] The bicycle sprockets S1 to S11 essentially have the same structures. The bicycle sprocket S7 will be described in detail below, and other sprockets will not be described in detail here for the sake of brevity.

[0074] As can be seen in Fig. 3 to Fig. 6, the bicycle sprocket S7 comprises a sprocket body 14 and a large number of chain drive teeth 16 The gear body 14 includes a radial outer circumference 18 one, provided around a central axis A1 of the bicycle sprocket S7. The multitude of chain drive teeth 16 are / will be provided on the outer radial circumference 18 for engaging with the bicycle chain C. The sprocket body 14 is / will be designed to be rotatable about the axis of rotation A1. The gear ring body 14 It has a ring-shaped form. The multitude of chain drive teeth 16extend radially outwards from the outer circumference of the radial 18 of the gear ring body 14 The S7 bicycle sprocket includes a hub engagement section. 20 The hub engagement section 20 is / will be provided on an inner circumference of the gear ring body 14 to intervene with the bicycle hub assembly 2 ( Fig. 2) The hub engagement section 20 partially forms the hub engagement structure 12 ( Fig. 2).

[0075] As can be seen in Fig. 3. The bicycle sprocket S7 includes a shifting aid area. 22 to simplify the shifting process of the bicycle chain C. In this embodiment, the shifting aid area closes 22 a high-shift assist range 22AA shifting aid for simplifying an upshift from the bicycle sprocket S7 to a smaller sprocket S8, adjacent to the bicycle sprocket S7 without another sprocket between the smaller sprocket S8 and the bicycle sprocket S7 in the axial direction D2. The shifting aid range 22 includes a downshift assist range 22B A device to simplify downshifting from the smaller sprocket S8 to the bicycle sprocket S7. The shifting aid range 22 is / will be defined around the axis of rotation A1.

[0076] As can be seen in Fig. 3, the switching aid area 22 a shift aid recess 24 open. The shift assist recess 24 closes a shift-up assist notch 26 a feature to simplify the upshifting process. In this embodiment, the upshifting aid recess is / will be 26Designed to reduce interference between the bicycle sprocket S7 and the bicycle chain C during upshifting. The upshifting aid recess 26 is / will be provided in the upshifting assistance area 22A .

[0077] As can be seen in Fig. 3 and Fig. 5, closes the upshift assist notch 26 a first upshift assist exception 26A , a second upshift assist notch 26B as well as a third upshift assist notch 26C The first upshift assist notch 26A is / will be provided on a subordinate side of the second upshift assist recess 26B in the drive direction D11. The second upshifting aid recess 26B is / will be provided on a subordinate page of the third upshift assist recess 26C in the drive direction D11. The second upshifting aid recess 26Bis / will be provided between the first upshift assist notch 26A and the third upshift assist notch 26C in the direction of rotation D1. The first to third upshifting aid recesses 26A and 26C are / are continuously provided in the direction of rotation D1. However, the shape of the upshifting aid recess is 26 not limited to this embodiment.

[0078] As can be seen in Fig. 4, closes the shift aid recess 24 an additional upshift assist notch 28 a feature to simplify the upshifting process. In this embodiment, the additional upshifting aid recess is / will be 28 Designed to simplify axial movement of the bicycle chain C relative to the bicycle sprocket S7, so that it smoothly disengages from the bicycle sprocket S7 during upshifting. The additional upshifting aid recess 28is / will be provided in the upshifting assistance area 22A .

[0079] As can be seen in Fig. 4 and Fig. 6, closes the additional upshift assist recess 28 a first additional upshift assist notch 28A and a second additional upshift assist notch 28B one. The first additional upshift assist notch 28A is / will be provided on an upstream side of the second additional upshift assist recess 28B in the drive direction D11. The first additional upshifting aid recess 28A is / will be provided separately from the second additional upshift assist cutout. 28B in the direction of rotation D1. However, the shape of the additional upshifting aid recess is 28 not limited to this embodiment.

[0080] As can be seen in Fig. 3, closes the shift aid recess 24a downshift assist notch 29 a feature to simplify the downshifting process. In this embodiment, the downshifting aid recess is / will be 29 Designed to reduce interference between the bicycle sprocket S7 and the bicycle chain C during downshifting. The downshift assist recess 29 is / will be provided in the downshift assist range 22B The downshift assist recess 29 can be omitted from the shift aid recess 24 .

[0081] As can be seen in Fig. 7, the bicycle sprocket S7 further comprises a first side surface 30 and a second side surface 32 The first side surface 30 is oriented in a first axial direction D21, parallel to the axis of rotation A1. The second side surface 32is directed in a second axial direction D22, which is an axial reverse direction with respect to the first axial direction D21. The switching aid area 22 is / will be arranged on the first side surface 30 The first side surface 30 is facing a smaller toothed ring S8 in the axial direction D2 without a further toothed ring between the first side surface 30 and the smaller gear ring S8. The second side surface 32 is facing a larger toothed ring S6 in the axial direction D2 without a further toothed ring between the second side surface 32 and the larger S6 gear ring.

[0082] As can be seen in Fig. 8, encompasses the multitude of chain drive teeth 16 a reference tooth 34 and a first tooth 36 The reference tooth 34 is / will be provided in the switching aid area 22 The first tooth 36is / will be provided in the switching aid area 22 In this embodiment, the first reference tooth is / will be 34 and the first tooth 36 provided in the upshifting assistance area 22A However, the reference tooth 34 and the first tooth 36 be / will be provided in the downshift assist range 22B ( Fig. 3).

[0083] The first tooth 36 is the reference tooth 34 adjacent in the direction of rotation D1, defined around the axis of rotation A1 without a further tooth between the first tooth 36 and the reference tooth 34 The first tooth 36 is / will be provided on a subordinate side of the reference tooth 34 in the drive direction D11, in which the bicycle sprocket S7 is / is rotated around the central axis of rotation A1 during pedaling. The shifting aid recess 24 extends at least from the reference tooth 34to the first tooth 36 In this embodiment, the upshifting aid recess extends 26 at least from the reference tooth 34 to the first tooth 36 in the direction of rotation D1. The first tooth 36 is / will be provided in the first upshift assist notch. 26A The reference tooth 34 is / will be provided in the second upshift assist notch. 26B The first upshift assist notch 26A is / will be provided on the first tooth 36 The second upshift assist notch 26B is / will be provided at the reference tooth 34 .

[0084] The multitude of chain drive teeth 16 includes a second tooth 38 , provided in the switching aid area 22 The second tooth 38 is / will be provided on a subordinate side of the first tooth 36in the drive direction D11, in which the bicycle sprocket S7 is / is rotated around the central axis of rotation A1 during pedaling. The second tooth 38 is the first tooth 36 adjacent in the drive direction of rotation D11 without another tooth between the reference tooth 34 and the second tooth 38 In this embodiment, the second tooth has... 38 an outline which essentially resembles the outline of the first tooth 36 The view from the axial direction D2 is identical. However, the second tooth 38 exhibit an outline that differs from the outline of the first tooth 36 The second tooth 38 can be omitted from the S7 bicycle sprocket.

[0085] As can be seen in Fig. 8, encompasses the multitude of chain drive teeth 16 an additional reference tooth 40 The additional reference tooth 40is / will be provided in the switching aid area 22 The additional reference tooth 40 is the additional reference tooth 40 adjacent in the direction of rotation D1 without another tooth between the first tooth 36 and the reference tooth 40 The reference tooth 34 is / will be provided on a subordinate side of the additional reference tooth 40 in the drive direction of rotation D11. The reference tooth 34 is / will be provided between the first tooth 36 and the reference tooth 40 in the direction of rotation D1.

[0086] The shift assist recess 24 extends from the additional reference tooth 40 to the first tooth 36 In particular, the upshift assist recess extends 26 from the additional reference tooth 40 to the first tooth 36 in the direction of rotation D1. The additional reference tooth 40is / will be provided in the third upshift assist notch. 26C The third upshift assist notch 26C is / will be provided at the additional reference tooth 40 In this embodiment, the additional reference tooth 40 an outline which is essentially an outline of the reference tooth 34 The result is identical when viewed from the axial direction D2. However, the additional reference tooth 40 exhibit an outline that differs from the outline of the reference tooth 34 Furthermore, the additional reference tooth 40 omitted from the S7 bicycle sprocket.

[0087] As can be seen in Fig. 9, the first tooth closes 36 a first subordinate tooth base 36A , a first pre-ordered tooth base 36B , a first subordinate circumferential area 36C , a first prior circumferential surface 36D, a first subordinate outside corner 36E and a first, pre-ordered outside corner 36F a.

[0088] The first subordinate tooth base 36A is / will be provided on the outer radial circumference 18 of the gear ring body 14 to define a base circle RC. The first pre-ordered tooth base 36B is / will be provided on the outer radial circumference 18 of the gear ring body 14 to define a base circle RC. The base circle RC extends through the first subordinate tooth base. 36A and the first pre-existing tooth base 36B In this embodiment, the base circle RC corresponds to the radial outer circumference. 18 of the gear ring body 14 .

[0089] The first subordinate circumferential surface 36C is oriented in a drive rotation direction D11. The first subordinate circumferential surface 36C extends from the first subordinate tooth base36A to a first subordinate radial outer end 36G of the first tooth 36 The first prior circumferential surface 36D is oriented in a reverse rotation direction D12, opposite to the drive rotation direction D11. The first upstream circumferential surface 36D extends from the first anterior tooth base 36B to a first, prior radial outer end 36H of the first tooth 36 .

[0090] The first subordinate outside corner 36E is / will be provided at the first subordinate radial outer end 36G in the first subordinate circumferential area 36C The first external corner 36F is / will be provided at the first upstream radial outer end 36H in the first prior circumferential area 36D The first external corner 36F is / will be positioned radially outwards from the first subordinate outer corner 36E .

[0091] As can be seen in Fig. 9, closes the first subordinate outside corner 36E a first subordinate curved edge, having a first subordinate radius of curvature R11. The first subordinate outside corner 36FIt includes a first upstream curved edge having a first upstream radius of curvature R12. In this embodiment, the first upstream radius of curvature R12 is different from the first downstream radius of curvature R11. The first upstream radius of curvature R12 is larger than the first downstream radius of curvature R11. However, the first upstream radius of curvature R12 can be equal to or smaller than the first downstream radius of curvature R11. In this embodiment, the first upstream radius of curvature R12 lies in a range of 0.5 mm to 3.0 mm. However, the first upstream radius of curvature R12 is not limited to this range. For example, the first upstream radius of curvature R12 can lie in a range of approximately 0.5 mm to approximately 3.0 mm. The first prior radius of curvature R12 can be less than 0.5 mm. The first prior radius of curvature R12 can be greater than 3.0 mm.

[0092] The first tooth 36 closes a first radial outer end 36K one, defined by the first upstream radial outer end 36H and the first subordinate radial outer end 36G as extending between the first prior outer corner 36F and the first subordinate outside corner 36E In this embodiment, the first radial outer end extends 36K linearly between the first ordered outer corner 36F and the first subordinate outside corner 36E The radial outer end 36K is / will be inclined to a stepwise radial approach of the base circle RC from the first prior external corner 36F to the first subordinate outside corner 36E However, the shape of the first radial outer end is 36K not limited to this embodiment.

[0093] As can be seen in Fig. 9, the first tooth has a first radial length L1, defined radially outwards from the first base circle RC of the bicycle sprocket S7. In this embodiment, the first radial length L1 is / is defined radially between the base circle RC and the first preceding outer corner. 36F The first radial length L1 is a maximum radial length, defined radially from the base circle RC in the first tooth. 36 The first radial length L1 can be defined radially between the base circle RC and another part of the first tooth. 36 than the maximum radial length of the first tooth 36 .

[0094] As can be seen in Fig. 10, the reference tooth closes 34 a subordinate reference tooth base 34A a, a prior reference tooth base 34B , a subordinate reference perimeter area 34C , a prior reference perimeter area 34D , a first subordinate reference outer corner 34Eas well as a preceding reference outside corner 34F .

[0095] The downstream reference floor 34A is / will be provided on the outer radial circumference 18 of the gear ring body 14 to define a base circle RC. The upstream reference tooth base. 34B is / will be provided on the outer radial circumference 18 of the gear ring body 14 to define a base circle RC. The base circle RC extends through the downstream reference tooth base. 34A and the upstream reference tooth base 34B .

[0096] The subordinate reference perimeter area 34C is oriented in a drive rotation direction D11. The subordinate reference circumferential surface 34C extends from subordinate reference tooth base 34A to a downstream reference radial outer end 34G of the reference tooth 34 The upstream reference perimeter area 34Dis oriented in a reverse rotation direction D12, opposite to the drive rotation direction D11. The upstream reference circumferential surface 34D extends from the preceding reference tooth base 34B to a prior reference radial outer end 34H of the reference tooth 34 .

[0097] The subordinate reference outer corner 34E is / will be provided at a downstream reference radial outer end 34G in the subordinate reference perimeter area 34C The upstream reference outside corner 34F is / will be provided at the upstream reference radial outer end 34H in the upstream reference perimeter area 34D The upstream reference outside corner 34F is / will be positioned radially outwards from the subordinate reference outer corner 34E .

[0098] As can be seen in Fig. 10, closes the subordinate reference outside corner 34Ea subordinate curved reference edge, having a subordinate reference radius of curvature R21. The upstream reference outer corner 34F It includes a front curved reference edge having a front reference radius of curvature R22. In this embodiment, the front reference radius of curvature R22 is equal to the back reference radius of curvature R21. The first back reference radius of curvature R11 is equal to each of the back reference radius of curvature R21 and the front reference radius of curvature R22. However, the front reference radius of curvature R22 may be different from the back reference radius of curvature R21. The first back reference radius of curvature R11 may be different from at least one of the back reference radius of curvature R21 and the front reference radius of curvature R22.

[0099] The reference tooth 34 closes a reference radial outer end 34Kone, defined by the upstream reference radial outer end 34H and the downstream reference radial outer end 34G as extending between the upstream reference outer corner 34F and the subordinate reference outer corner 34E In this embodiment, the reference radial outer end has 34K a curved shape extending between the preceding reference outer corner 34F and the subordinate reference outer corner 34E However, the shape of the reference radial outer end is 34K not limited to this embodiment.

[0100] As can be seen in Fig. 10, the reference tooth indicates 34 A reference radial length L2 is defined radially outwards from the first base circle RC of the bicycle sprocket S7. In this embodiment, the reference radial length L2 is / is defined radially between the base circle RC and the outer end of the reference radial. 34KThe reference radial length L2 is a maximum radial length, defined radially from the base circle RC in the reference tooth. 34 However, the reference radial length L2 can be defined radially between the base circle RC and another part of the reference tooth. 34 than the maximum radial length of the reference tooth 34 .

[0101] As can be seen in Fig. 11, the second tooth closes 38 a second subordinate tooth base 38A , a second, pre-existing tooth base 38B , a second subordinate circumferential area 38C , a second prior circumferential surface 38D , a second subordinate outside corner 38E and a second, forward-facing external corner 38F a.

[0102] The second subordinate tooth base 38A is / will be provided on the outer radial circumference 18 of the gear ring body 14to define a base circle RC. The second upstream tooth base 38B is / will be provided on the outer radial circumference 18 of the gear ring body 14 to define a base circle RC. The second subordinate circumferential surface 38C is oriented in a drive rotation direction D11. The second subordinate circumferential surface 38C extends from the second subordinate tooth base 38A to a second subordinate radial outer end 38G of the second tooth 38 The second prior circumferential surface 38D is oriented in a reverse rotation direction D12, opposite to the drive rotation direction D11. The second, upstream circumferential surface 38D extends from the second anterior tooth base 38B to a second, upstream radial outer end 38H of the second tooth 38 .

[0103] The second subordinate outside corner 38Eis / will be provided at the second subordinate radial outer end 38G the second subordinate circumferential area 38C The second projecting outside corner 38F is / will be provided at the second upstream radial outer end 38H the second prior circumferential area 38D The second projecting outside corner 38F is / will be positioned radially outwards from the second subordinate outer corner 38E .

[0104] The second subordinate outside corner 38E includes a second subordinate curved edge, having a second subordinate radius of curvature R31. The second subordinate outer corner 38FIt includes a second upstream curved edge, having a second upstream radius of curvature R32. In this embodiment, the second upstream radius of curvature R32 is different from the second downstream radius of curvature R31. The second upstream radius of curvature R32 is larger than the second downstream radius of curvature R31. The second upstream radius of curvature R32 can be equal to or smaller than the second downstream radius of curvature R31. In this embodiment, the second upstream radius of curvature R32 lies in a range of 0.5 mm to 3.0 mm. However, the second upstream radius of curvature R32 is not limited to this range. For example, the second upstream radius of curvature R32 can lie in a range from approximately 0.5 mm to approximately 3.0 mm. The second prior radius of curvature R32 can be less than 0.5 mm. The second prior radius of curvature R32 can be greater than 3.0 mm.

[0105] The second tooth 38 closes a second radial outer end 38K one, defined by the second prior radial outer end 38H and the second subordinate radial outer end 38G as extending between the second prior outer corner 38F and the second subordinate outer corner 38E In this embodiment, the second radial outer end extends 36K linearly between the second preceding outer corner 38F and the second subordinate outer corner 38E The second radial outer end 38K is / will be inclined to a stepwise radial approach of the base circle RC from the second prior outer corner 38F to the second subordinate outer corner 38E However, the shape of the second radial outer end is 38K not limited to this embodiment.

[0106] The second tooth 38It has a second radial length L3, defined radially outwards from the first base circle RC. In this embodiment, the second radial length L3 is / is defined radially between the base circle RC and the second preceding outer corner. 38F The second radial length L3 is a maximum radial length, defined radially from the base circle RC in the second tooth. 38 However, the second radial length L3 can be defined radially between the base circle RC and another part of the second tooth. 38 than the maximum radial length of the second tooth 38 .

[0107] As can be seen in Fig. 12, the additional reference tooth 40 an additional downstream reference tooth base 40A , an additional upstream reference tooth base 40B , an additional subordinate reference perimeter area 40C , an additional upstream reference perimeter area 40D, an additional subordinate reference outside corner 40E and an additional upstream reference outside corner 40F a.

[0108] The additional downstream reference floor 40A is / will be provided on the outer radial circumference 18 of the gear ring body 14 to define a base circle RC. The additional upstream reference base. 40B is / will be provided on the outer radial circumference 18 of the gear ring body 14 to define a base circle RC. The base circle RC extends through the additional downstream reference tooth base. 40A and the additional upstream reference tooth base 40B .

[0109] The additional subordinate reference perimeter area 40C is oriented in a drive rotation direction D11. The additional subordinate reference circumferential surface 40C extends from the additional downstream reference floor 40Ato an additional downstream reference radial outer end 40G of the additional reference tooth 40 The additional upstream reference perimeter area 40D is oriented in a reverse rotation direction D12, opposite to the drive rotation direction D11. The additional upstream reference circumferential surface 40D extends from the additional upstream reference road surface 40B to an additional upstream reference radial outer end 40H of the additional reference tooth 40 .

[0110] The additional subordinate reference outer corner 40E is / will be provided at the additional downstream reference radial outer end 40G in the additional subordinate reference perimeter area 40C The additional upstream reference outside corner 40F is / will be provided at the additional upstream reference radial outer end 40Hin the additional upstream reference perimeter area 40D The additional upstream reference outside corner 40F is / will be positioned radially outwards from the additional subordinate reference outer corner 40E .

[0111] As can be seen in Fig. 12, closes the additional subordinate reference outside corner 40E an additional downstream curved reference edge, having an additional downstream reference radius of curvature R41. The additional upstream reference outer corner 40FIt includes an additional upstream curved reference edge, comprising an additional upstream reference radius of curvature R42. In this embodiment, the upstream reference radius of curvature R42 is equal to the additional downstream reference radius of curvature R41. The first downstream radius of curvature R11 is equal to each of the additional downstream reference radius of curvature R41 and the additional upstream reference radius of curvature R42. However, the additional upstream reference radius of curvature R42 may differ from the additional downstream reference radius of curvature R41. The first downstream radius of curvature R11 may differ from at least one of the additional downstream reference radius of curvature R41 and the additional upstream reference radius of curvature R42.

[0112] The additional reference tooth 40 includes an additional reference radial outer end 40Kone, defined by the additional upstream reference radial outer end 40H and the additional downstream reference radial outer end 40G as extending between the additional upstream reference outer corner 40F and the additional subordinate reference outer corner 40E In this embodiment, the additional reference radial outer end has 40K a curved shape extending between the additional, prior reference outer corner 40F and the additional subordinate reference outer corner 40E However, the shape of the additional reference radial outer end is 40K not limited to this embodiment.

[0113] As can be seen in Fig. 12, the additional reference tooth 40An additional reference radial length L4 is defined radially outwards from the first base circle RC of the bicycle sprocket S7. In this embodiment, the additional reference radial length L4 is defined radially between the base circle RC and the outer end of the additional reference radial. 40K The additional reference radial length L4 is a maximum radial length, defined radially from the base circle RC in the additional reference tooth. 40 However, the additional reference radial length L4 can be defined radially between the base circle RC and another part of the additional reference tooth. 40 than the maximum radial length of the additional reference tooth 40 .

[0114] As can be seen in Fig. 8, the first radial length L1 is greater than the reference radial length L2. In this embodiment, the first radial length L1 is greater than the reference radial length L2 by a radial length in a range of 0.5 mm to 1.0 mm. However, the first radial length L1 is not limited to this range. For example, the first radial length L1 can be greater than the reference radial length L2 by a radial length in a range of approximately 0.5 mm to approximately 1.0 mm. The first radial length L1 can be greater than the reference radial length L2 by a radial length less than 0.5 mm. The first radial length L1 can be greater than the reference radial length L2 by a radial length greater than 1.0 mm.

[0115] In this embodiment, the second radial length L3 is greater than the reference radial length L2. The second radial length L3 is equal to the first radial length L1. The second radial length L3 is greater than the reference radial length L2 by one radial length in a range of 0.5 mm to 1.0 mm. However, the second radial length L3 can be equal to or less than the reference radial length L2. The second radial length L3 is not limited to this range. For example, the second radial length L3 can be greater than the reference radial length L2 by one radial length in a range of approximately 0.5 mm to approximately 1.0 mm. The second radial length L3 can be greater than the reference radial length L2 by one radial length less than 0.5 mm. The second radial length L3 can be greater than the reference radial length L2 by one radial length greater than 1.0 mm.

[0116] In this embodiment, the additional reference radial length L4 is radially equal to the reference radial length L2. However, the additional reference radial length L4 can be different from the reference radial length L2.

[0117] As can be seen in Fig. 13, the reference tooth closes 34 an inclined reference surface 34L one. The first tooth 36 closes a first inclined surface 36L one. The second tooth 38 closes a second inclined surface 38L one. A region of the first inclined surface 36L is larger than an area of ​​the second inclined surface 38L The inclined reference surface 34L , the first inclined surface 36L and the second inclined surface 38L are / will be provided on the first page 30 of the bicycle sprocket S7. At least one of the inclined reference surfaces 34L , the first inclined surface 36Land the second inclined surface 38L can be omitted from the S7 bicycle sprocket.

[0118] As can be seen in Fig. 14, the reference tooth closes 34 an additional inclined reference surface 34M one. The first tooth 36 closes a first additional inclined surface 36M one. The second tooth 38 closes a second additional inclined surface 38M one. An area of ​​the first additional inclined surface 36M is larger than an area of ​​the second additional inclined surface 38M The additional inclined reference surface 34M , the first additional inclined surface 36M and the second additional inclined surface 38M are / will be provided on the second side panel 32 of the bicycle sprocket S7. At least one of the additional inclined reference surfaces 34M , the first additional inclined surface 36Mand the second additional inclined surface 38M can be omitted from the S7 bicycle sprocket.

[0119] As can be seen in Fig. 15, encompasses the multitude of chain drive teeth 16 a first downshift assist gear 42 , a second downshift assist tooth 44 and a third downshift assist gear 46 The first downshift assist gear 42 , the second downshift assist tooth 44 and the third downshift assist gear 46 are / will be arranged in the switching aid area 22 ( Fig. 3) to simplify the downshifting process. In this embodiment, the first downshifting auxiliary tooth is / will be 42 , the second downshift assist tooth 44 and the third downshift assist gear 46 provided in the downshift assist range 22B The second downshift assist gear 44 and the third downshift assist gear 46are / will be provided in the downshift assist recess 29 The first downshift assist gear 42 is / will be provided outside the downshift assist exception 29 The first downshift assist gear 42 The bicycle chain C initially engages in the downshift mechanism under the multitude of chain drive teeth. 16 .

[0120] The second downshift assist gear 44 is / will be arranged on a subordinate side of the first downshift auxiliary tooth 42 in the drive direction D11. The second downshift auxiliary tooth 44 is the first downshift assist gear 42 adjacent in the direction of rotation D1 without another tooth between the first downshifting auxiliary tooth 42 and the second downshift assist gear 44 The third downshift assist gear 46 is / will be arranged on a subordinate side of the second downshift auxiliary tooth 44in the drive direction D11. The third downshift auxiliary tooth 46 is the second downshift assist gear 44 adjacent in the direction of rotation D1 without another tooth between the downshifting helper tooth 44 and the third downshift assist gear 46 .

[0121] As can be seen in Fig. 15, the second downshift assist tooth closes 44 a subordinate tooth base 44A , a pre-existing tooth base 44B , a subordinate circumferential area 44C and a preceding circumferential area 44D one. The subordinate tooth base 44A is / will be provided on the outer radial circumference 18 of the gear ring body 14 to define a base circle RC. The upstream tooth base. 44B is / will be provided on the outer radial circumference 18 of the gear ring body 14to define a base circle RC. The base circle RC extends through the subordinate tooth base. 44A and the pre-existing dentin floor 44B .

[0122] The subordinate perimeter area 44C is oriented in a drive rotation direction D11. The subordinate circumferential surface 44C extends from the downstream tooth base 44A to a subordinate radial outer end 44G of the second downshift assist tooth 44 The preceding circumferential area 44D is oriented in a reverse rotation direction D12, opposite to the drive rotation direction D11. The upstream circumferential surface 44D extends from the anterior tooth base 44B to a prior radial outer end 44H of the second downshift assist tooth 44 The second downshift assist gear 44 closes a radial outer end 44K one, defined by the upstream radial outer end 44Hand the downstream radial outer end 44G .

[0123] The preceding perimeter area 44D and the radial outer end 44K provide an outline that is partially identical to the outline of the reference tooth 34 is ( Fig. 12) when viewed from the axial direction D2. However, the subordinate circumferential surface represents 44C an outline is provided which is different from the outline of the reference tooth. 34 (the subordinate reference perimeter area 34C ) ( Fig. 12) when viewed from the axial direction D2. In this embodiment, the subordinate circumferential surface represents 44C an area of ​​the second downshift assist tooth 44 ready, which is larger than an area of ​​the reference tooth 34 when viewed from the axial direction D2. This improves the strength of the second downshifting auxiliary tooth. 44 , even if the downshift assist cutout 29an axial thickness of the second downshift auxiliary tooth 44 reduced.

[0124] The third downshift assist gear 46 has a shape which is essentially identical to a shape of the second downshift auxiliary tooth 44 This is D2 when viewed from the axial direction. Therefore, it will not be described in detail here for the sake of brevity.

[0125] The upshifting mechanism of the bicycle chain C will be described below, with reference to... Fig. 16 to Fig. 18. In Fig. 16 and Fig. 18 shows a circle S8A, a partial circle of the smaller gear ring S8.

[0126] As can be seen in, for example, Fig. 16, the bicycle chain C is / will first be thrown over by the bicycle sprocket S7 at the reference tooth 34 in the shift assist area 22 , if a rear derailleur RD ( Fig. 2) The bicycle chain C is shifted towards the smaller sprocket S8 in a state where the bicycle chain C is engaged with the bicycle sprocket S7. During this upshifting process, an opposing pair of inner links C1 is disengaged from the reference tooth. 34 As can be seen in Fig. 17, the bicycle chain C is the last to disengage from the first tooth. 36 In this upshift actuation, an opposing pair of outer tabs C2 are disengaged from the first tooth. 36 At that time, as can be seen in Fig. 17 and Fig. 18, it is likely that the tip (e.g. the first pre-ordered radial outer end) 36H ) of the first tooth 36 unintentionally positioned between the inner plate C1A and the outer plate C2A near a roller C3 due to an axial force applied by the bicycle chain C at the first tooth 36 .

[0127] Since the first radial length L1 is larger than the reference radial length L2, as can be seen in Fig. 17, however, it is possible to delay a timing with the bicycle sprocket S7, in which the first tooth 36 Out of engagement is or reaches with the bicycle chain C in comparison with the reference tooth 34 , since the first radial length L1 of the first tooth 36 is greater than the reference radial length L2 of the reference tooth 34 This shifts a dislodgement position P11, in which the first tooth 36 out of engagement or is reached by the bicycle chain C from a position P12, where one of the bicycle chain C is at the first tooth 36 The applied axial force is greater than at the release position P11 during pedaling. This can reduce the axial force applied by the bicycle chain C at the first tooth. 36 , when the first tooth 36The bicycle chain C is disengaged or becomes disengaged when the bicycle chain C is shifted from the bicycle sprocket to an adjacent sprocket. Therefore, a smooth shifting action of the bicycle chain C is possible.

[0128] The second tooth 38 It has essentially the same effect as that of the first tooth. 36 in a case where the bicycle chain C is / is thrown over by the bicycle sprocket S7 at the first tooth 36 in the shift assist area 22 Therefore, it will not be described in detail here for the sake of brevity.

[0129] The term "encompass" and its derivatives, as used here, are intended 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 a similar meaning, such as "include," "exhibit," and their derivatives.

[0130] The terms “link”, “section”, “part”, “element”, “body”, and “structure”, when used in the singular, can also have the dual meaning of a single part or a multitude of parts.

[0131] The ordinal numbers such as “first” and “second,” as mentioned in the present application, are merely identifiers and have no further meaning, such as indicating a specific order or similar. Moreover, the term “first element,” for example, does not in itself imply the presence of a “second element,” and the term “second element” does not in itself imply the presence of a “first element.”

[0132] The term “pair of”, as used here, can encompass the configuration in which the pair of elements has different shapes and structures, as well as the configuration in which the pair of elements has the same shapes and structures.

[0133] Finally, terms of magnitude such as "essentially", "approximately" and "approximately", as used here, mean a proportionate degree of deviation from the modified term, so that the end result is not substantially altered (e.g. manufacturing tolerances).

[0134] Obviously, numerous modifications and variations of the present invention are possible in light of the teaching stated above. It should therefore be noted that, within the scope of the appended claims, the invention can be applied in a manner other than specifically described herein.

Claims

[1] Bicycle sprocket, comprising: a gear body, including a radial outer circumference, provided around a rotational center axis of the bicycle gear; a shifting aid area for simplifying a shifting operation of the bicycle chain, wherein the shifting aid area has a shifting aid recess; and a multitude of chain drive teeth provided on the radial outer circumference for engagement with a bicycle chain, the multitude of chain drive teeth comprising: a reference tooth, provided in the shifting aid area, wherein the reference tooth has a reference radial length defined radially outward from a base circle of the bicycle sprocket; and a first tooth provided in the shifting aid area, wherein the first tooth has a first radial length defined radially outward from the base circle of the bicycle sprocket, the first radial length being greater than the reference radial length, the first tooth being adjacent to the reference tooth in a direction of rotation defined about the central axis of rotation without any further tooth between the first tooth and the reference tooth, the first tooth being provided on a subordinate side of the reference tooth in a drive direction of rotation in which the bicycle sprocket is rotated about the central axis of rotation during pedaling, and the shifting aid recess extending at least from the reference tooth to the first tooth. [2] Bicycle sprocket according to claim 1, wherein the first tooth includes a first subordinate tooth base, provided on the radial outer circumference of the gear ring body to define the base circle, a first, pre-ordered tooth base, provided on the radial outer circumference of the gear ring body to define the base circle, a first subordinate circumferential surface, oriented in a drive rotation direction, wherein the first subordinate circumferential surface extends from the first subordinate tooth root to a first subordinate radial outer end of the first tooth, a first prior circumferential surface, oriented in a reverse direction of rotation opposite to the direction of drive rotation, wherein the first prior circumferential surface extends from the first prior tooth root to a first prior radial outer end of the first tooth, a first subordinate outside corner, provided at the first subordinate radial outside end in the first subordinate circumferential surface, and a first pre-ordered outside corner provided at the first pre-ordered radial outer end in the first pre-ordered circumferential surface, wherein the first pre-ordered outside corner is / is positioned radially outwards from the first sub-ordered outside corner. [3] Bicycle sprocket according to claim 2, wherein the first subordinate outside corner includes a first subordinate curved edge, having a first subordinate radius of curvature, the first prior external corner encloses a first prior curved edge, having a first prior radius of curvature, and the first prior radius of curvature is different from the first subsequent radius of curvature. [4] Bicycle sprocket according to claim 3, wherein the first ordered radius of curvature in a range of 0.5 mm to 3.0 mm; and / or the first prior radius of curvature is larger than the first subsequent radius of curvature. [5] Bicycle sprocket according to any one of claims 2 to 4, wherein the first tooth includes a first radial outer end, defined by the first upstream radial outer end and the first downstream radial outer end as extending between the first upstream outer corner and the first downstream outer corner. [6] Bicycle sprocket according to any one of claims 2 to 5, wherein the first radial length is / is defined radially between the base circle and the first prior outer corner. [7] Bicycle sprocket according to any one of claims 1 to 6, further comprising: a first side surface, oriented in a first axial direction, parallel to the axis of rotation; and a second side surface, oriented in a second axial direction, which is an axial reverse direction with respect to the first axial direction, wherein The switching aid area is / will be located on the first side surface. [8] Bicycle sprocket according to any one of claims 1 to 7, wherein the multitude of chain drive teeth includes a second tooth, provided in the shifting aid area, the second tooth has a second radial length, defined radially outwards from the base circle, and the second radial length is greater than the reference radial length. [9] Bicycle sprocket according to any one of claims 1 to 8, wherein the first radial length and / or the second radial length is greater than the reference radial length by a radial length in a range of 0.5 mm to 1.0 mm. [10] Bicycle sprocket according to claim 8 or 9, if dependent on claim 8, wherein the second radial length is equal to the first radial length. [11] Bicycle sprocket according to one of claims 8 and 9 to 10, if directly or indirectly dependent on claim 8, wherein the second tooth is / is provided on a downstream side of the first tooth in a drive direction of rotation in which the bicycle sprocket is / is rotated about the axis of rotation during pedaling, preferably the second tooth being adjacent to the first tooth in the drive direction of rotation without a further tooth between the reference tooth and the second tooth. [12] Bicycle sprocket according to any one of claims 9 to 11, if directly or indirectly dependent on claim 8, wherein the second tooth a second subordinate tooth base, provided on the radial outer circumference of the gear ring body for defining the base circle, a second, upstream tooth base, provided on the radial outer circumference of the gear ring body for defining the base circle, a second subordinate circumferential surface, oriented in a drive rotation direction, wherein the second subordinate circumferential surface extends from the second subordinate tooth root to a second subordinate radial outer end of the second tooth, a second prior circumferential surface, oriented in a reverse direction opposite to the direction of drive rotation, wherein the second prior circumferential surface extends from the second prior tooth base to a second prior radial outer end of the second tooth, a second subordinate outside corner, provided at the second subordinate radial outside end of the second subordinate circumferential surface, and a second prior outer corner provided at the second prior radial outer end of the second prior circumferential surface, wherein the second prior outer corner is / is positioned radially outwards from the second prior outer corner. [13] Bicycle sprocket according to claim 12, wherein the second subordinate outer corner includes a second subordinate curved edge, having a second subordinate radius of curvature, the second prior outer corner includes a second prior curved edge, having a second prior radius of curvature, and the second prior radius of curvature is different from the second subsequent radius of curvature. [14] Bicycle sprocket according to claim 13, wherein the second prior radius of curvature lies in a range from 0.5 mm to 3.0 mm; and / or the second prior radius of curvature is larger than the second subsequent radius of curvature. [15] Bicycle sprocket according to any one of claims 12 to 14, wherein the second tooth includes a second radial outer end, defined by the second upstream radial outer end and the second downstream radial outer end as extending between the second upstream outer corner and the second downstream outer corner. [16] Bicycle sprocket according to any one of claims 12 to 15, wherein the second radial length is / is defined radially between the base circle and the second prior outer corner. [17] Bicycle sprocket according to any one of claims 1 to 16, wherein the shifting aid area includes an upshifting aid area to simplify an upshifting process from the bicycle sprocket to a smaller sprocket adjacent to the bicycle sprocket without a further sprocket between the smaller sprocket and the bicycle sprocket in the axial direction. [18] Bicycle sprocket according to any one of claims 1 to 17, wherein The shift assist range includes a downshift assist range to simplify downshifting from a smaller sprocket to the bicycle sprocket, and The smaller sprocket is adjacent to the bicycle sprocket without another sprocket between the smaller sprocket and the bicycle sprocket in the axial direction.

Images