CN110077519B

CN110077519B - Bicycle sprocket assembly

Info

Publication number: CN110077519B
Application number: CN201910068173.XA
Authority: CN
Inventors: 冯颂源; 赖颖涵
Original assignee: Shimano Singapore Pte Ltd
Current assignee: Shimano Singapore Pte Ltd
Priority date: 2018-01-25
Filing date: 2019-01-24
Publication date: 2022-01-04
Anticipated expiration: 2039-01-24
Also published as: TWI814773B; CN110077519A; TW201932359A; DE102018201182A1

Abstract

The bicycle sprocket assembly (28) has a center axis of rotation (C1). A bicycle sprocket assembly (28) includes first and second sprockets (32A, 32B), a sprocket carrier (30), and a first spacer (31). The sprocket carrier (30) supports a first sprocket (32A) and a second sprocket (32B) and has a first engagement profile (30 d). The first spacer (31) is adjacent to the sprocket carrier (30) in an axial direction relative to the rotational center axis (C1). The first spacer (31) supports the sprocket carrier (30) in the axial direction and has a second engagement profile (31 c). The second engagement profile (31c) is configured to engage with the first engagement profile (30d) of the sprocket carrier (30).

Description

Bicycle sprocket assembly

Technical Field

The present invention relates to a bicycle sprocket assembly.

Background

Bicycling is becoming an increasingly popular form of recreation as well as a means of transportation. Moreover, bicycling has become a very popular competitive sport for both amateurs and professionals.

Whether the bicycle is used for recreation, 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 bicycle sprocket assembly. The bicycle sprocket assembly is mounted to a bicycle frame, such as to a bicycle hub assembly.

Disclosure of Invention

In accordance with one aspect of the present invention, a bicycle sprocket assembly has a central axis of rotation. A bicycle sprocket assembly includes a plurality of sprockets, a sprocket carrier and a spacer. The sprocket carrier supports a plurality of sprockets and has a first engagement profile. The spacer is adjacent the sprocket carrier in an axial direction relative to the center axis of rotation. The spacer supports the sprocket carrier in the axial direction and has a second engagement profile. The second engagement profile is configured to engage with the first engagement profile of the sprocket carrier. With such a bicycle sprocket assembly, the sprocket carrier supports the plurality of sprockets, and the spacer supports the sprocket carrier in the axial direction.

Therefore, even if the sprocket carrier supports a plurality of sprockets, the bicycle sprocket assembly can stably support the sprocket carrier in the axial direction by the spacer.

In particular, the bicycle sprocket assembly can stably support the sprocket carrier in the axial direction by the spacer even if the chain is engaged with the front and rear sprockets such that the chain is inclined between the front and rear sprockets.

Preferably, the bicycle sprocket assembly further comprises an additional sprocket. The additional sprocket is adjacent to the spacer in the axial direction such that the spacer is disposed between the sprocket carrier and the additional sprocket. Even if the chain engages with the front and rear sprockets such that the chain tilts between the front and rear sprockets, such a bicycle sprocket assembly can stably support the sprocket carrier in the axial direction by the spacer and the additional sprocket.

Preferably, the bicycle sprocket assembly further comprises an additional sprocket carrier. The additional sprocket carrier supports a plurality of sprockets. The additional sprocket carrier is adjacent the spacer in the axial direction such that the spacer is disposed between the sprocket carrier and the additional sprocket carrier. Even if the chain engages with the front and rear sprockets such that the chain tilts between the front and rear sprockets, such a bicycle sprocket assembly can stably support the sprocket carrier in the axial direction by the spacer and the additional sprocket.

Preferably, the bicycle sprocket assembly is configured such that the sprocket carrier has at least one first opening as the first engagement profile. The spacer has at least one axial projection as a second engagement profile. The at least one axial projection of the spacer mates with the at least one first opening of the sprocket carrier. Such a bicycle sprocket assembly can reduce weight and effectively prevent relative rotation of the sprocket carrier and the spacer.

Preferably, the bicycle sprocket assembly is configured such that the spacer has at least one second opening surrounded by the axial projection. Such a bicycle sprocket assembly can further reduce weight and reliably prevent relative rotation of the sprocket carrier and the spacer.

Preferably, the bicycle sprocket assembly is configured such that the sprocket carrier has a plurality of first openings as the first engagement profile. The spacer has a plurality of axial projections as second engagement profiles. The plurality of axial projections of the spacer are respectively mated with the plurality of first openings of the sprocket carrier. Such a bicycle sprocket assembly can further reduce weight and reliably prevent relative rotation of the sprocket carrier and the spacer.

Preferably, the bicycle sprocket assembly is configured such that the spacer has a plurality of second openings that are respectively surrounded by the plurality of axial projections. Such a bicycle sprocket assembly can further reduce weight and reliably prevent relative rotation of the sprocket carrier and the spacer.

Preferably, the bicycle sprocket assembly is configured such that the first engagement profile is disposed radially inward from the plurality of sprockets with respect to the rotational center axis. Even if the chain engages with the front and rear sprockets such that the chain tilts between the front and rear sprockets, such a bicycle sprocket assembly can stably support the sprocket carrier in the axial direction by the spacer.

Preferably, the bicycle sprocket assembly is configured such that the sprocket carrier includes a first center portion and a plurality of first arms. A plurality of first arms extend radially outward from the first center portion. A first engagement profile is at least partially disposed in at least one of the first plurality of arms. Even if the chain engages with the front and rear sprockets such that the chain tilts between the front and rear sprockets, such a bicycle sprocket assembly can stably support the sprocket carrier in the axial direction by the spacer.

Preferably, the bicycle sprocket assembly is configured such that the spacer includes a second center portion and a plurality of second arms. A plurality of second arms extend radially outward from the second center portion. A second engagement profile is at least partially disposed in at least one of the plurality of second arms. Even if the chain engages with the front and rear sprockets such that the chain tilts between the front and rear sprockets, such a bicycle sprocket assembly can stably support the sprocket carrier in the axial direction by the spacer.

Preferably, the bicycle sprocket assembly is configured such that the spacer has at least one axial abutment surface. At least one axial abutment surface surrounds the at least one axial projection. At least one axial abutment surface of the spacer is configured to abut against the sprocket carrier in the assembled state. Such a bicycle sprocket assembly can improve the assembly efficiency of the spacer and the sprocket carrier.

Preferably, the bicycle sprocket assembly is configured such that the spacer has a plurality of axial abutment surfaces. A plurality of axial abutment surfaces respectively surround the plurality of axial projections. The plurality of axial abutment surfaces of the spacer are configured to abut against the sprocket carrier in the assembled state. Such a bicycle sprocket assembly can further improve the efficiency of assembly of the spacer and the sprocket carrier.

Preferably, the bicycle sprocket assembly is configured such that the at least one axial projection is integrally formed with the spacer as a one-piece, unitary member. In addition to improving the assembly efficiency of the spacer, such a bicycle sprocket assembly can be efficiently manufactured.

Preferably, the bicycle sprocket assembly is configured such that the plurality of axial projections are integrally formed with the spacer as a one-piece, unitary member. In addition to improving the assembly efficiency of the spacer, such a bicycle sprocket assembly can be efficiently manufactured.

Preferably, the bicycle sprocket assembly further comprises a plurality of additional sprockets. Such a bicycle sprocket assembly is capable of having a wide range of gears.

Preferably, the bicycle sprocket assembly is configured such that the sprocket carrier has a hub engaging profile. Such a bicycle sprocket assembly can be stably operated even if the chain is engaged with the front and rear sprockets such that the chain is inclined between the front and rear sprockets.

Preferably, the bicycle sprocket assembly is configured such that the spacer has a hub engaging profile. Such a bicycle sprocket assembly can be stably operated even if the chain is engaged with the front and rear sprockets such that the chain is inclined between the front and rear sprockets.

Preferably, the bicycle sprocket assembly is configured such that the spacer does not have a hub engaging profile. Such a bicycle sprocket assembly can improve the assembly efficiency of the spacer and the sprocket carrier.

In accordance with another aspect of the present invention, a bicycle sprocket assembly has a central axis of rotation. The bicycle sprocket assembly includes a spacer and one of a sprocket carrier and a sprocket. The one of the sprocket carrier and the sprocket has a first engagement profile and a hub engagement profile. The spacer is adjacent to the one of the sprocket carrier and the sprocket in an axial direction with respect to the rotational center axis. The spacer supports the one of the sprocket carrier and the sprocket in the axial direction and has a second engagement profile. The second engagement profile is configured to engage the first engagement profile of the one of the sprocket carrier and the sprocket. The spacer does not have a hub engaging profile. With such a bicycle sprocket assembly, the spacer supports the one of the sprocket carrier and the sprocket in the axial direction and does not have a hub engaging profile.

Therefore, even if the chain is engaged with the front and rear sprockets such that the chain is inclined between the front and rear sprockets, the bicycle sprocket assembly can stably support the one of the sprocket carrier and the sprocket in the axial direction through the spacer. Furthermore, the bicycle sprocket assembly can improve the assembly efficiency of the spacer and the one of the sprocket carrier and the sprocket.

Preferably, the bicycle sprocket assembly is configured such that the one of the sprocket carrier and the sprocket has at least one first opening as the first engagement profile. The spacer has at least one axial projection as a second engagement profile. The at least one axial projection of the spacer mates with the at least one first opening of the one of the sprocket carrier and the sprocket. Such a bicycle sprocket assembly can reduce the weight of the one of the sprocket carrier and the sprocket. Furthermore, the bicycle sprocket assembly can effectively prevent relative rotation of the spacer and the one of the sprocket carrier and the sprocket.

Preferably, the bicycle sprocket assembly is configured such that the spacer has at least one second opening surrounded by the axial projection. Such a bicycle sprocket assembly can reduce the weight of the spacer. Furthermore, the bicycle sprocket assembly can effectively prevent relative rotation of the spacer and the one of the sprocket carrier and the sprocket.

Preferably, the bicycle sprocket assembly is configured such that the one of the sprocket carrier and the sprocket includes a first center portion and a plurality of first arms. A plurality of first arms extend radially outward from the first center portion. A first engagement profile is at least partially disposed in at least one of the first plurality of arms. Such a bicycle sprocket assembly can reduce the weight of the one of the sprocket carrier and the sprocket. Further, even if the chain is engaged with the front and rear sprockets such that the chain is inclined between the front and rear sprockets, the bicycle sprocket assembly can stably support the one of the sprocket carrier and the sprocket in the axial direction through the spacer.

Preferably, the bicycle sprocket assembly is configured such that the spacer includes a second center portion and a plurality of second arms. A plurality of second arms extend radially outward from the second center portion. A second engagement profile is at least partially disposed in at least one of the plurality of second arms. Such a bicycle sprocket assembly can reduce the weight of the spacer. Further, even if the chain is engaged with the front and rear sprockets such that the chain is inclined between the front and rear sprockets, the bicycle sprocket assembly can stably support the one of the sprocket carrier and the sprocket in the axial direction through the spacer.

Preferably, the bicycle sprocket assembly is configured such that the spacer has at least one axial abutment surface. At least one axial abutment surface surrounds the at least one axial projection. At least one axial abutment surface of the spacer is configured to abut against the one of the sprocket carrier and the sprocket in the assembled condition. Such a bicycle sprocket assembly can improve the efficiency of assembly of the spacer and the one of the sprocket carrier and the sprocket.

Preferably, the bicycle sprocket assembly is configured such that the second engagement profile is integrally formed with the spacer as a one-piece, unitary member. Such a bicycle sprocket assembly can be stably operated even if the chain is engaged with the front and rear sprockets such that the chain is inclined between the front and rear sprockets.

Drawings

Embodiments of the present invention will now be explained with reference to the accompanying drawings, which form a part of this original disclosure, wherein

FIG. 1 is a side elevational view of a bicycle in accordance with a first embodiment of the present invention;

FIG. 2 is a perspective view of the outside of the bicycle rear sprocket assembly in accordance with the first embodiment of the present invention.

FIG. 3 is a perspective view of the inner side of the bicycle rear sprocket assembly in accordance with the first embodiment of the present invention.

FIG. 4 is a cross-sectional perspective view of the inner side of the bicycle rear sprocket assembly in accordance with the first embodiment of the present invention.

FIG. 5 is a perspective view of a sprocket carrier according to a first embodiment of the present invention.

Fig. 6 is a perspective view of a first spacer according to a first embodiment of the present invention.

Fig. 7 is a perspective view of a first spacer as a modification of the first embodiment according to the present invention.

FIG. 8 is a cross-sectional perspective view of the inner side of the bicycle rear sprocket assembly in accordance with the second embodiment of the present invention; and

FIG. 9 is a cross-sectional perspective view of the inner side of the first sprocket and spacer in accordance with the second embodiment of the present invention.

Detailed Description

In embodiments, the following directional terms "forward", "rearward", "left", "right", "high", "low", "upward" and "downward" as well as any other similar directional terms refer to those directions determined based on a user seated on a bicycle seat (not shown) of a bicycle and facing a bicycle handlebar (not shown).

As shown in fig. 1, the bicycle 1 includes a bicycle chain 9, a frame 11, a handlebar 13, front and

rear wheels

17 and 19, a shifting device 24, a drive portion 25, and a front fork 39.

The front fork 39 is rotatably attached to the frame 11. The handle 13 is fixed to the front fork 39. The front wheel 17 is rotatably attached to the front fork 39. The rear wheel 19 is rotatably attached to the rear of the frame 11 via a rear hub assembly 29. The front tire 17a is attached to the front wheel 17. The rear tire 19a is attached to the rear wheel 19.

The shifter 24 is attached to the handlebar 13. The shifting device 24 operates a rear derailleur 26 via the control cable 22. The rear derailleur 26 moves the bicycle chain 9 from one rear sprocket of a bicycle rear sprocket assembly 28 (an example of a bicycle sprocket assembly) to another rear sprocket of the bicycle rear sprocket assembly 28 through the shifting device 24. The rear sprockets are shown in simplified depiction in fig. 1. The rear derailleur 26 is attached to the rear of the frame 11, for example.

The drive section 25 basically includes a crank assembly 27 and a bicycle rear sprocket assembly 28. Specifically, the drive section 25 basically includes a crank assembly 27, a rear hub assembly 29 and a bicycle rear sprocket assembly 28.

The crank assembly 27 is rotatably supported on the lower portion of the frame 11. The crank assembly 27 includes at least one front sprocket 35. In this embodiment, the crank assembly 27 includes a front sprocket 35 that engages the bicycle chain 9.

A rear hub assembly 29 is mounted on the rear of the frame 11. The rear hub assembly 29 supports the bicycle rear sprocket assembly 28.

As seen in fig. 1, the bicycle rear sprocket assembly 28 is rotatably supported by a rear hub assembly 29. Specifically, the bicycle rear sprocket assembly 28 is rotatably supported by the outer portion of the rear hub assembly 29. The outer portion is configured to rotate relative to the hub shaft 51 of the rear hub assembly 29. The drum shaft 51 is mounted to the rear of the frame 11.

As seen in fig. 2 to 4, the bicycle rear sprocket assembly 28 has a center axis of rotation C1. As seen in fig. 3 and 4, the bicycle rear sprocket assembly 28 includes a sprocket carrier 30 and a first spacer 31 (an example of a spacer). Specifically, the bicycle rear sprocket assembly 28 includes first and

second sprockets

32A and 32B (an example of a plurality of sprockets), a sprocket carrier 30 and a first spacer 31. In other words, the bicycle rear sprocket assembly 28 includes a plurality of

sprockets

32A, 32B, a sprocket carrier 30 and a spacer 31. As seen in fig. 4, the bicycle rear sprocket assembly 28 further includes second through sixth spacers 33A through 33E.

As seen in fig. 2, the bicycle rear sprocket assembly 28 further includes a third sprocket 32C (an example of an additional sprocket). In other words, the bicycle rear sprocket assembly 28 also includes the additional sprocket 32C. The bicycle rear sprocket assembly 28 also includes fourth through tenth sprockets 32D to 32J (an example of a plurality of additional sprockets). In other words, the bicycle rear sprocket assembly 28 also includes a plurality of additional sprockets 32D to 32J.

As shown in fig. 2, the first sprocket 32A to the tenth sprocket 32J each include a different diameter. The first through tenth sprockets 32A-32J each include a plurality of teeth for engaging the bicycle chain 9. A plurality of teeth are provided on an outer peripheral portion of each of the first to tenth sprockets 32A to 32J.

As shown in fig. 2 and 4, the first sprocket 32A is formed in a substantially annular shape. The first sprocket 32A is configured such that the outer diameter of the first sprocket 32A is largest among the first to tenth sprockets 32A to 32J. The first sprocket 32A is attached to the sprocket carrier 30 by a fixing member 34 (e.g., a rivet).

The second sprocket 32B is spaced from the first sprocket 32A in an axial direction relative to the rotational center axis C1. The second sprocket 32B is formed in a substantially annular shape. The second sprocket 32B is configured such that the second sprocket 32B has a smaller outer diameter than the first sprocket 32A. The second sprocket 32B is attached to the sprocket carrier 30 by a fixing member 34 (e.g., a rivet).

The third sprocket 32C is spaced from the second sprocket 32B in an axial direction relative to the rotational center axis C1. The third sprocket 32C is adjacent to the first spacer 31 in the axial direction such that the first spacer 31 is disposed between the sprocket carrier 30 and the third sprocket 32C. In other words, the additional sprocket 32C is adjacent to the spacer 31 in the axial direction such that the spacer 31 is disposed between the sprocket carrier 30 and the additional sprocket 32C. The third sprocket 32C is configured such that the third sprocket 32C has a smaller outer diameter than the second sprocket 32B.

The fourth to tenth sprockets 32D to 32J are respectively disposed at intervals from each other in the axial direction with respect to the rotational center axis C1. The fourth to tenth sprockets 32D to 32J are configured such that the outer diameter of each of the fourth to tenth sprockets 32D to 32J decreases from the third sprocket 32C toward the tenth sprocket 32J.

As shown in fig. 4, each of the third to tenth sprockets 32C to 32J has a hub engagement profile 32Ca, 32Da, 32Ea, 32Fa, 32Ga, 32Ha, 32Ia, 32 Ja. The hub engagement profile 32Ca to 32Ja of each of the third to tenth sprockets 32C to 32J is provided on an inner peripheral portion of each of the third to tenth sprockets 32C to 32J. The drum engagement profiles 32Ca to 32Ja engage with the rear drum assembly 29 (see fig. 1). For example, in the mounted state of the bicycle rear sprocket assembly 28 to the rear hub assembly 29, the hub engagement profiles 32Ca to 32Ja of each of the third to tenth sprockets 32C to 32J are engaged with the rear hub assembly 29 by spline engagement.

As shown in fig. 4, the sprocket carrier 30 supports a first sprocket 32A and a second sprocket 32B (an example of a plurality of sprockets). For example, one side of the sprocket carrier 30 supports a first sprocket 32A. The other side of the sprocket carrier 30 supports a second sprocket 32B. The other side of the sprocket carrier 30 faces the third sprocket 32C in an axial direction relative to the rotational center axis C1.

As shown in FIG. 5, sprocket carrier 30 includes a first center section 30a and a plurality of first arms 30 b. The sprocket carrier 30 has a hub engaging profile 30 c. The sprocket carrier 30 has a first engagement profile 30 d.

First central portion 30a is formed in a substantially annular shape. The rear hub assembly 29 is disposed on the inner peripheral side of the first central portion 30 a.

A first plurality of arms 30b extend radially outward from first hub 30 a. Each of the plurality of first arms 30b is disposed at a distance from each other in the circumferential direction with respect to the rotation center axis C1.

The proximal ends of first arms 30b are connected to first umbilicus 30 a. For example, the proximal ends of first arms 30b are integrally formed as a one-piece, unitary member with first hub 30 a. The first and

second sprockets

32A and 32B are attached to the distal end of each of the first arms 30B by a fixing member 34 (e.g., a rivet).

A hub engagement contour 30c is provided on an inner peripheral portion of first central portion 30 a. The drum engagement profile 30c engages the rear drum assembly 29. For example, in the mounted state of the bicycle rear sprocket assembly 28 to the rear hub assembly 29, the hub engagement profile 30c engages the rear hub assembly 29 (see fig. 1) through a spline engagement.

As shown in fig. 4, the first engagement profile 30d is disposed radially inward from the first sprocket 32A and the second sprocket 32B (an example of a plurality of sprockets) with respect to the rotational center axis C1. As shown in fig. 5, a first engagement profile 30d is at least partially disposed in at least one of the plurality of first arms 30 b. In this embodiment, a first engagement profile 30d is provided in each of the plurality of first arms 30 b.

As shown in fig. 5, the sprocket carrier 30 has at least one first opening 30d as a first engagement profile. In this embodiment, the sprocket carrier 30 has a plurality of first openings 30d as the first engagement profile.

Each of the first openings 30d is provided on each of the plurality of first arms 30 b. Each of the first openings 30d penetrates each of the plurality of first arms 30b in the axial direction with respect to the rotation center axis C1.

As shown in fig. 4, each of the first openings 30d is disposed between the rotational center axis C1 and the first and

second sprockets

32A and 32B. Specifically, each of the first openings 30d is disposed between the first center portion 30a and the first and

second sprockets

32A, 32B in a radial direction relative to the rotational center axis C1.

The first spacer 31 is preferably made of a non-metal, such as resin or the like. Further, the first spacer 31 may be made of metal, such as aluminum, titanium, iron, or the like.

As shown in fig. 4, the first spacer 31 (an example of a spacer) is adjacent to the sprocket carrier 30 in the axial direction with respect to the rotational center axis C1. The first spacer 31 (an example of a spacer) supports the sprocket carrier 30 in the axial direction with respect to the rotational center axis C1.

Specifically, the first spacer 31 is disposed between the sprocket carrier 30 and the third sprocket 32C in the axial direction relative to the rotational center axis C1. The first spacer 31 supports the sprocket carrier 30 by engaging with and abutting against the sprocket carrier 30 and the third sprocket 32C.

As shown in fig. 6, the first spacer 31 (an example of a spacer) includes a second center portion 31a and a plurality of second arms 31 b. The first spacer 31 (an example of a spacer) has a second engagement profile 31 c. The first spacer 31 (an example of a spacer) has at least one axial abutment surface 31 d. The first spacer 31 (an example of a spacer) does not have a hub engagement profile. In other words, the first spacer 31 is not engaged with the rear hub assembly 29.

The second central portion 31a is formed in a substantially annular shape. The rear hub assembly 29 is disposed on the inner peripheral side of the second central portion 31 a.

A plurality of second arms 31b extend radially outward from the second central portion 31 a. Each of the plurality of second arms 31b is disposed at intervals from each other in the circumferential direction with respect to the rotation center axis C1.

The proximal ends of the second arms 31b are connected to the second central portion 31 a. For example, the proximal ends of the second arms 31b are integrally formed with the second central portion 31a as a one-piece, unitary member.

As shown in fig. 4 and 6, the second engagement profile 31c is configured to engage with the first engagement profile 30d of the sprocket carrier 30. The second engagement profile 31C is disposed radially inward from the first sprocket 32A and the second sprocket 32B with respect to the rotational center axis C1. The second engagement profile 31c is at least partially provided in at least one of the plurality of second arms 31 b. In this embodiment, a second engagement profile 31c is provided in each of the plurality of second arms 31 b. The second joining profile 31c is integrally formed with the first spacer 31 (an example of a spacer) as a one-piece, unitary member.

The first spacer 31 (an example of a spacer) has at least one axial protrusion 31c as a second engagement profile. The at least one axial projection 31c of the first spacer 31 (an example of a spacer) is fitted with the at least one first opening 30d of the sprocket carrier 30. The at least one axial protrusion 31c is integrally formed with the first spacer 31 (an example of a spacer) as a one-piece, unitary member.

In this embodiment, the first spacer 31 (an example of a spacer) has a plurality of axial protrusions 31c as the second engagement profile. Each of the plurality of axial protrusions 31c protrudes from the first spacer 31 in the axial direction. Specifically, each of the plurality of axial protrusions 31c protrudes from each of the second arms 31b in the axial direction. Preferably, the plurality of axial protrusions 31c are integrally formed with the first spacer 31 as a one-piece, unitary member.

The plurality of axial protrusions 31c of the first spacer 31 (an example of a spacer) are fitted with the plurality of first openings 30d of the sprocket bracket 30, respectively. In this embodiment, the axial projection 31c is inserted into the first opening 30d of the sprocket bracket 30 and engages with the first opening 30d of the sprocket bracket 30, for example, by elastic engagement, press-fit engagement, or the like.

As shown in fig. 4 and 6, the first spacer 31 (an example of a spacer) has at least one second opening 31e surrounded by an axial protrusion 31 c. In this embodiment, the first spacer 31 (an example of a spacer) has a plurality of second openings 31e surrounded by a plurality of axial protrusions 31c, respectively.

Each of the second openings 31e is disposed between the rotation center axis C1 and the first and

second sprockets

32A and 32B in a radial direction with respect to the rotation center axis C1. Each of the second openings 31e is provided on each of the plurality of second arms 31 b. Each of the second openings 31e penetrates each of the plurality of second arms 31b in the axial direction with respect to the rotation center axis C1.

As shown in fig. 4 and 6, at least one axial abutment surface 31d of the first spacer 31 (an example of a spacer) is configured to abut against the sprocket carrier 30 in the assembled state. At least one axial abutment surface 31d surrounds at least one axial projection 31 c.

In this embodiment, the first spacer 31 (an example of a spacer) has a plurality of axial abutment surfaces 31d that surround the plurality of axial protrusions 31c, respectively. The plurality of axial abutment surfaces 31d are configured to abut against the sprocket carrier 30 in the assembled state. A plurality of axial abutment surfaces 31d are provided on the second arms 31b, respectively, around the proximal ends of the axial projections 31 c.

As shown in fig. 4, each of the second to sixth spacers 33A to 33E is formed in a substantially annular shape. The second to sixth spacers 33A to 33E are briefly described below, because each of the second to sixth spacers 33A to 33E is a conventional spacer.

The second spacer 33A is disposed between the third sprocket 32C and the fourth sprocket 32D in the axial direction relative to the rotational center axis C1. The third spacer 33B is disposed between the fourth sprocket 32D and the fifth sprocket 32E in the axial direction.

The fourth spacer 33C is disposed between the fifth sprocket 32E and the sixth sprocket 32F in the axial direction. The fifth spacer 33D is disposed between the sixth sprocket 32F and the seventh sprocket 32G in the axial direction. The sixth spacer 33E is disposed between the seventh sprocket 32G and the eighth sprocket 32H in the axial direction.

The center portion 32Ib of the ninth sprocket 32I functions as a spacer. The central portion 32Ib of the ninth sprocket 32I is configured to abut against the eighth sprocket 32H in the axial direction. The central portion 32Ib of the ninth sprocket 32I projects in the axial direction from the ninth sprocket 32I toward the eighth sprocket 32H.

The center portion 32Jb of the tenth sprocket 32J functions as a spacer. The center portion 32Jb of the tenth sprocket 32J is configured to abut against the ninth sprocket 32I in the axial direction. The center portion 32Jb of the tenth sprocket 32J protrudes in the axial direction from the tenth sprocket 32J toward the ninth sprocket 32I.

The bicycle rear sprocket assembly 28 described above is attached to a rear hub assembly 29 as follows. First, the first sprocket 32A and the second sprocket 32B are fixed to the sprocket carrier 30. The first spacer 31 is attached to the sprocket bracket 30 by fitting the axial protrusion 31c to the first opening 30d and abutting against the sprocket bracket 30 via the axial abutment surface 31 d. The first spacer 31 is not engaged with the outer peripheral portion of the rear hub assembly 29 because the first spacer 31 does not have a spline portion engaged with the rear hub assembly 29 in this embodiment.

Next, the sprocket carrier 30 is disposed on the outer peripheral portion of the rear hub assembly 29 by spline engagement. The third sprocket 32C is disposed on the outer peripheral portion of the rear hub assembly 29 such that the third sprocket 32C abuts against the first spacer 31 in the axial direction with respect to the rotational center axis C1.

The fourth to eighth sprockets 32D to 32H are respectively provided on the outer peripheral portion of the rear hub assembly 29 by spline engagement via second to sixth spacers 33A to 33E.

The ninth sprocket 32I is disposed on the outer peripheral portion of the rear hub assembly 29 by spline engagement such that the center portion 32Ib of the ninth sprocket 32I abuts against the eighth sprocket 32H in the axial direction with respect to the rotational center axis C1.

The tenth sprocket 32J is mounted to the rear hub assembly 29 by spline engagement such that the center portion 32Jb of the tenth sprocket 32J abuts against the ninth sprocket 32I in the axial direction with respect to the rotational center axis C1.

Finally, the sprocket carrier 30, the third to tenth sprockets 32C to 32J and the first to

sixth spacers

31, 33A to 33E are positioned by the locking members 37 (see fig. 4) attached to the rear hub assembly 29.

As a variation of the first embodiment, the sprocket carrier 30 can support three or more sprockets. Further, the sprocket carrier 30 can be made of a metallic material, such as aluminum, titanium, iron, or the like, or a non-metallic material, such as plastic, fiber reinforced plastic, or the like.

As another modification of the first embodiment, as shown in fig. 7, the first spacer 31 (an example of a spacer) may have a hub engaging profile 31 f. In this case, for example, the drum engagement profile 31f of the first spacer 31 is engaged with the rear drum assembly 29 by spline engagement.

As yet another variation of the first embodiment, the bicycle rear sprocket assembly 28 (an example of a bicycle sprocket assembly) can further include an additional sprocket carrier. In this case, for example, the additional sprocket carrier supports the third sprocket 32C and the fourth sprocket 32D (an example of a plurality of sprockets). Of course, the additional sprocket carrier can support three or more sprockets.

The additional sprocket carrier is adjacent to the first spacer member 31 in the axial direction such that the first spacer member 31 (an example of a spacer member) is disposed between the sprocket carrier 30 and the additional sprocket carrier. Specifically, the first spacer 31 is disposed between the sprocket bracket 30 and the additional sprocket bracket in a state where the first spacer 31 abuts against the sprocket bracket 30 and the additional sprocket bracket.

A detailed explanation of the substantially same configuration as that of the first embodiment is omitted in the second embodiment. With respect to the description omitted below, the description of the first embodiment is applied to the second embodiment.

In the second embodiment, the bicycle rear sprocket assembly 128 (an example of a bicycle sprocket assembly) has a rotational center axis C1. As shown in fig. 8, the first sprocket 132A functions as the sprocket carrier 30 of the first embodiment. In this case, the bicycle rear sprocket assembly 128 (an example of a bicycle sprocket assembly) includes a first sprocket 132A (an example of a sprocket) and a first spacer 31 (an example of a spacer).

Specifically, the bicycle rear sprocket assembly 128 includes the first sprocket 132A and the first spacer 31 without the sprocket carrier 30 of the first embodiment.

The first spacer 31 (an example of a spacer) is adjacent to the first sprocket 132A (an example of a sprocket) in the axial direction with respect to the rotational center axis C1. The first spacer 31 supports the first sprocket 132A in the axial direction. The first spacer 31 has a second engagement profile 31c, and the second engagement profile 31c is configured to engage with a third engagement profile 132d (an example of a first engagement profile) of the first sprocket 132A. The first spacer 31 (an example of a spacer) does not have a hub engagement profile.

The first spacer 31 (an example of a spacer) has at least one axial protrusion 31c as a second engagement profile. The at least one axial protrusion 31c of the first spacer 31 is fitted with at least one third opening 132d (described below) of the first sprocket 132A (an example of a sprocket).

The first spacer 31 has at least one axial abutment surface 31 d. At least one axial abutment surface 31d of the first spacer 31 (an example of a spacer) is configured to abut against the first sprocket 132A (an example of a sprocket) in an assembled state.

The bicycle rear sprocket assembly 128 also includes a second sprocket 132B (an example of an additional sprocket). The bicycle rear sprocket assembly 128 also includes third through ninth sprockets 132C through 132I (examples of a plurality of additional sprockets). The bicycle rear sprocket assembly 128 further includes second through sixth spacers 33A through 33E.

The configuration of the first spacer 31 is the same as that of the first embodiment (see fig. 6). The configurations of the second to ninth sprockets 132B to 132I correspond to the configurations of the third to tenth sprockets 32C to 32J of the first embodiment (see fig. 4). The configurations of the second to sixth spacers 33A to 33E are the same as those of the first embodiment (see fig. 4). Therefore, explanation of these configurations is omitted in the second embodiment.

As shown in fig. 8 and 9, the first sprocket 132A (an example of a sprocket) includes a third center portion 132A (an example of a first center portion) and a plurality of third arms 132b (an example of a first arm). The first sprocket 132A further includes an outer peripheral portion 132 c. The first sprocket 132A (an example of a sprocket) has a third engagement profile 132d (an example of a first engagement profile). The first sprocket 132A has a hub engaging profile 132 e.

The third center portion 132a is formed in a substantially annular shape. The rear hub assembly 29 is disposed on the inner peripheral side of the third central portion 132 a.

The outer peripheral portion 132c is formed in a substantially annular shape. The outer peripheral portion 132C is disposed radially outward from the third central portion 132a with respect to the rotational center axis C1. The outer peripheral portion 132c includes a plurality of teeth.

A plurality of third arms 132b (an example of a first arm) extend radially outward from the third center portion 132a (an example of a first center portion). The plurality of third arms 132b are disposed between the third center portion 132a and the outer peripheral portion 132C in the radial direction with respect to the rotation center axis C1.

A plurality of third arms 132b are connected to the third central portion 132a and the peripheral portion 132 c. For example, the plurality of third arms 132b are integrally formed with the third central portion 132a and the outer peripheral portion 132c as a one-piece, unitary member.

The third engagement profile 132d is configured to engage with the second engagement profile 31c of the first spacer 31. The third engagement contour 132d is disposed radially inward from the outer peripheral portion 132C with respect to the rotational center axis C1.

The third engagement profile 132d is at least partially disposed in at least one of the plurality of third arms 132 b. In this embodiment, a third engagement profile 132d is provided in each of the plurality of third arms 132 b.

The first sprocket 132A has at least one third opening 132d (an example of at least one first opening) as a third engagement contour (an example of a first engagement contour). For example, the first sprocket 132A has a plurality of third openings 132d as a third engagement contour.

Each of the third openings 132d is provided on each of the plurality of third arms 132 b. Each of the third openings 132d penetrates each of the plurality of third arms 132b in the axial direction with respect to the rotation center axis C1.

Each of the third openings 132d is provided between the outer peripheral portion 132C and the rotation center axis C1. Specifically, each of the third openings 132d is provided between the outer peripheral portion 132C and the third center portion 132a in a radial direction with respect to the rotational center axis C1.

A hub engaging contour 132e is provided on an inner peripheral portion of the third central portion 132 a. The drum engagement profile 132e engages the rear drum assembly 29. For example, in the mounted state of the bicycle rear sprocket assembly 128 to the rear hub assembly 29, the hub engagement profile 132e engages the rear hub assembly 29 through a spline engagement.

The bicycle rear sprocket assembly 128 described above is attached to the rear hub assembly 29 as follows. First, the first spacer 31 is attached to the first sprocket 132A by fitting the axial protrusion 31c to the third opening 132d and abutting against the first sprocket 132A via the axial abutment surface 31 d. The first spacer 31 is not engaged with the outer peripheral portion of the rear hub assembly 29 because the first spacer 31 does not have a spline portion engaged with the rear hub assembly 29 in this embodiment.

Next, the first sprocket 132A is disposed on the outer peripheral portion of the rear hub assembly 29 by spline engagement. The second sprocket 132B is disposed on the outer peripheral portion of the rear hub assembly 29 such that the second sprocket abuts against the first spacer 31 in the axial direction with respect to the rotational center axis C1.

The third to seventh sprockets 132C to 132G are respectively provided on the outer peripheral portion of the rear hub assembly 29 by spline engagement via the second to sixth spacers 33A to 33E.

The eighth sprocket 132H is disposed on the outer peripheral portion of the rear hub assembly 29 by spline engagement such that the center portion 132Ha of the eighth sprocket 132H abuts against the seventh sprocket 132G in the axial direction with respect to the rotational center axis C1.

The ninth sprocket 132I is mounted to the rear hub assembly 29 by spline engagement such that a center portion 132Ia of the ninth sprocket 132I abuts against the eighth sprocket 132H.

Finally, the first to ninth sprockets 132A to 132I and the first to

sixth spacers

31, 33A to 33E are positioned by the locking member 37 attached to the rear hub assembly 29.

As a modification of the second embodiment, as shown in fig. 7, the first spacer 31 may have a hub engaging profile 31 f. In this case, for example, as in the first embodiment, the drum engagement profile 31f of the first spacer 31 is engaged with the rear drum assembly 29 by spline engagement.

The configurations of the first embodiment and the second embodiment can be described as follows.

The bicycle rear sprocket assembly 28, 128 (an example of a bicycle sprocket assembly) has a center axis of rotation C1. The bicycle

rear sprocket assembly

28, 128 includes one of the sprocket carrier 30 and a first sprocket 132A (an example of a sprocket), and a first spacer 31 (an example of a spacer).

The one of the sprocket carrier 30 and the first sprocket 132A (an example of a sprocket) includes a

first center portion

30a, 132A and a plurality of

first arms

30b, 132 b. The one of the sprocket carrier 30 and the first sprocket 132A has a

first engagement profile

30d, 132d and a

hub engagement profile

30c, 132 e.

A plurality of

first arms

30b, 132b extend radially outward from

first hub

30a, 132 a. The

first engagement profile

30d, 132d is at least partially disposed in at least one of the plurality of

first arms

30b, 132 b. The one of the sprocket carrier 30 and the first sprocket 132A (an example of a sprocket) has at least one

first opening

30d, 132d as a first engagement contour.

The first spacer 31 (an example of a spacer) supports the one of the sprocket carrier 30 and the first sprocket 132A in the axial direction with respect to the rotational center axis C1. The first spacer 31 is adjacent to the one of the sprocket carrier 30 and the first sprocket 132A in an axial direction relative to the rotational center axis C1.

The first spacer 31 (an example of a spacer) includes a second center portion 31a and a plurality of second arms 31 b. The first spacer 31 (an example of a spacer) has a second engagement profile 31 c. The first spacer 31 (an example of a spacer) has at least one axial abutment surface 31 d. The first spacer 31 (an example of a spacer) does not have a hub engagement profile.

A plurality of second arms 31b extend radially outward from the second central portion 31 a. The second engagement profile 31c is configured to engage with the

first engagement profile

30d, 132d of the one of the sprocket carrier 30 and the first sprocket 132A.

The second engagement profile 31c is at least partially provided in at least one of the plurality of second arms 31 b. The second engaging profile 31c is integrally formed with the first spacer 31 as a one-piece, unitary member.

The first spacer 31 (an example of a spacer) has at least one axial protrusion 31c as a second engagement profile. The at least one axial projection 31c of the first spacer 31 mates with the at least one

first opening

30d, 132d of the one of the sprocket carrier 30 and the first sprocket 132A.

The first spacer 31 (an example of a spacer) has at least one second opening 31e surrounded by an axial protrusion 31 c. At least one axial abutment surface 31d surrounds at least one axial projection 31 c. At least one axial abutment surface 31d of the first spacer 31 (an example of a spacer) is configured to abut against the one of the sprocket bracket 30 and the first sprocket 132A in the assembled state.

In understanding the scope of the present disclosure, the terms "part," "section," "portion," "member" or "element" when used in the singular can have the dual meaning of a single part or a plurality of parts.

Also as used herein to describe the above embodiments, the following directional terms "forward", "rearward", "above", "downward", "vertical", "horizontal", "below" and "transverse" as well as any other similar directional terms refer to those directions of the bicycle sprocket assembly.

Accordingly, these terms, as utilized to describe the present technology should be interpreted relative to a bicycle sprocket assembly.

List of reference numerals

1 bicycle

9 bicycle chain

11 vehicle frame

13 handle

17 front wheel

17a front tyre

19 rear wheel

19a rear tyre

22 control cable

24 gearshift

25 drive part

26 rear derailleur

27 crank assembly

28 bicycle rear chain wheel assembly

29 rear hub assembly

30 sprocket wheel bracket

30a first central part

30b first arm

30c hub engagement profile

30d first engaging profile, first opening

31 first spacer

31a second center part

31b second arm

31c second engagement profile, axial projection

31d axial abutment surface

31e second opening

31f hub engagement profile

32A first sprocket

32B second sprocket

32C third sprocket

32D fourth sprocket

32E fifth sprocket

32F sixth sprocket

32G seventh sprocket

32H eighth sprocket

32I ninth sprocket

32J tenth sprocket

32Ca、32Da、

32Ea、32Fa、

32Ga、32Ha、

32Ia, 32Ja hub engagement profile

32Ib, 32Jb center part

33A second spacer

33B third spacer

33C fourth spacer

33D fifth spacer

33E sixth spacer

34 fixing component

35 front chain wheel

37 locking member

39 front fork

51 hub axle

Rear chain wheel assembly for 128-cycle

132A first sprocket

132B second sprocket

132C third sprocket

132D fourth sprocket

132E fifth sprocket

132F sixth sprocket

132G seventh sprocket

132H eighth sprocket

132I ninth sprocket

132a third center section

132b third arm

132c outer peripheral portion

132d third joining Profile, third opening

132e hub engagement profile

Center axis of rotation of C1

Claims

1. A bicycle sprocket assembly (28) having a center axis of rotation (C1), the bicycle sprocket assembly (28) comprising:

a plurality of sprockets (32A, 32B) including a first sprocket and a second sprocket;

a sprocket carrier (30), the sprocket carrier (30) supporting the plurality of sprockets (32A, 32B) and having a first engagement profile (30 d); and

a spacer (31), the spacer (31) being adjacent to the sprocket carrier (30) in an axial direction with respect to the rotational center axis (C1), the spacer (31) supporting the sprocket carrier (30) in the axial direction and having a second engagement profile (31C), the second engagement profile (31C) being configured to engage with the first engagement profile (30d) of the sprocket carrier (30),

wherein the spacer (31) has at least one axial projection (31c) as the second engagement contour (31c), the at least one axial projection (31c) being disposed between the rotational center axis and the first and second sprockets in a radial direction with respect to the rotational center axis.

2. The bicycle sprocket assembly (28) according to claim 1, further comprising:

an additional sprocket (32C), the additional sprocket (32C) being adjacent to the spacer (31) in the axial direction such that the spacer (31) is disposed between the sprocket carrier (30) and the additional sprocket (32C).

3. The bicycle sprocket assembly (28) according to claim 1, further comprising:

an additional sprocket carrier supporting a plurality of sprockets; wherein,

the additional sprocket carrier is adjacent to the spacer (31) in the axial direction such that the spacer (31) is disposed between the sprocket carrier (30) and the additional sprocket carrier.

4. The bicycle sprocket assembly (28) according to any one of claims 1 to 3,

the sprocket carrier (30) having at least one first opening (30d) as the first engagement profile (30 d); and is

The at least one axial projection (31c) of the spacer (31) cooperates with the at least one first opening (30d) of the sprocket carrier (30).

5. The bicycle sprocket assembly (28) according to claim 4,

the spacer (31) has at least one second opening (31e) surrounded by the axial projection (31 c).

6. The bicycle sprocket assembly (28) according to any one of claims 1 to 3,

the sprocket carrier (30) having a plurality of first openings (30d) as the first engagement profiles (30 d);

the spacer (31) has a plurality of axial projections (31c) as the second engagement profile (31 c); and is

The plurality of axial protrusions (31c) of the spacer (31) are fitted with the plurality of first openings (30d) of the sprocket carrier (30), respectively.

7. The bicycle sprocket assembly (28) according to claim 6,

the spacer (31) has a plurality of second openings (31e) surrounded by the plurality of axial protrusions (31c), respectively.

8. The bicycle sprocket assembly (28) according to any one of claims 1 to 3,

the first engagement profile (30d) is disposed radially inward from the plurality of sprockets (32A, 32B) relative to the rotational center axis (C1).

9. The bicycle sprocket assembly (28) according to any one of claims 1 to 3,

the sprocket carrier (30) includes a first hub (30a) and a plurality of first arms (30b) extending radially outward from the first hub (30 a); and is

The first engagement profile (30d) is at least partially provided in at least one of the plurality of first arms (30 b).

10. The bicycle sprocket assembly (28) according to any one of claims 1 to 3,

the spacer (31) comprises a second central portion (31a) and a plurality of second arms (31b) extending radially outwards from the second central portion (31 a); and is

The second engagement profile (31c) is at least partially provided in at least one of the plurality of second arms (31 b).

11. The bicycle sprocket assembly (28) according to claim 4,

the spacer (31) having at least one axial abutment surface (31d) surrounding the at least one axial projection (31 c); and is

The at least one axial abutment surface (31d) of the spacer (31) is configured to abut against the sprocket carrier (30) in an assembled state.

12. The bicycle sprocket assembly (28) according to claim 6,

the spacer (31) has a plurality of axial abutment surfaces (31d) respectively surrounding the plurality of axial projections (31 c); and is

The plurality of axial abutment surfaces (31d) of the spacer (31) are configured to abut against the sprocket carrier (30) in an assembled state.

13. The bicycle sprocket assembly (28) according to claim 4,

the at least one axial projection (31c) is integrally formed with the spacer (31) as a one-piece, unitary member.

14. The bicycle sprocket assembly (28) according to claim 6,

the plurality of axial protrusions (31c) are integrally formed with the spacer (31) as a one-piece, unitary member.

15. The bicycle sprocket assembly (28) according to any one of claims 1 to 3, further comprising:

a plurality of additional sprockets (32C-J).

16. The bicycle sprocket assembly (28) according to any one of claims 1 to 3,

the sprocket carrier (30) has a hub engaging profile (30 c).

17. The bicycle sprocket assembly (28) according to any one of claims 1 to 3,

the spacer (31) has a hub engagement profile (31 f).

18. The bicycle sprocket assembly (28) according to any one of claims 1 to 3,

the spacer (31) has no drum engagement profile (31 f).

19. A bicycle sprocket assembly (28) having a center axis of rotation (C1), the bicycle sprocket assembly (28) comprising:

one of a sprocket carrier (30) and a sprocket (132A), the one of the sprocket carrier (30) and the sprocket (132A) having a first engagement profile (30d, 132d) and a hub engagement profile (30c, 132 e); and

a spacer (31), said spacer (31) being adjacent to said one of said sprocket carrier (30) and said sprocket (132A) in an axial direction relative to said center axis of rotation (C1), said spacer (31) supporting said one of said sprocket carrier (30) and said sprocket (132A) in said axial direction and having a second engagement profile (31C), said second engagement profile (31C) being configured to engage with said first engagement profile (30d, 132d) of said one of said sprocket carrier (30) and said sprocket (132A), said spacer (31) having no hub engagement profile (31f),

wherein the spacer (31) comprises a second central portion (31a) and a plurality of second arms (31b) extending radially outwards from the second central portion (31a), and the second engagement profile (31c) is at least partially provided in at least one of the plurality of second arms (31 b).

20. The bicycle sprocket assembly (28) according to claim 19,

said one of said sprocket carrier (30) and said sprocket (132A) having at least one first opening (30d, 132d) as said first engagement profile (30d, 132 d);

the spacer (31) having at least one axial projection (31c) as the second engagement contour (31 c); and is

The at least one axial protrusion (31c) of the spacer (31) mates with the at least one first opening (30d, 132d) of the one of the sprocket carrier (30) and the sprocket (132A).

21. The bicycle sprocket assembly (28) according to claim 20,

22. The bicycle sprocket assembly (28) according to any one of claims 19 to 21,

the one of the sprocket carrier (30) and the sprocket (132A) includes a first center portion (30a, 132A) and a plurality of first arms (30b, 132b) extending radially outward from the first center portion (30a, 132A); and is

The first engagement profile (30d, 132d) is at least partially disposed in at least one of the plurality of first arms (30b, 132 b).

23. The bicycle sprocket assembly (28) according to claim 20,

The at least one axial abutment surface (31d) of the spacer (31) is configured to abut against the one of the sprocket carrier (30) and the sprocket (132A) in an assembled state.

24. The bicycle sprocket assembly (28) according to any one of claims 19 to 21,

the second engagement profile (31c) is integrally formed with the spacer (31) as a one-piece, unitary member.