TW201932359A - Bicycle sprocket assembly - Google Patents

Abstract

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

Description

Bicycle sprocket assembly

The invention relates to a bicycle sprocket assembly.

Cycling is becoming an increasingly popular form of entertainment and a means of transportation. In addition, cycling 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 on a bicycle frame, for example, is mounted on a bicycle hub assembly.

According to an aspect of the present invention, a bicycle sprocket assembly has a rotation center axis. The bicycle sprocket assembly includes a plurality of sprocket wheels, a sprocket carrier, and a spacer. A sprocket bracket supports the plurality of sprocket wheels and has a first engagement profile. The spacer is adjacent to the sprocket carrier in an axial direction with respect to the rotation center axis. The spacer supports the sprocket bracket 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 this bicycle sprocket assembly, the sprocket bracket supports the plurality of sprocket wheels and the spacer supports the sprocket bracket in the axial direction.

Thereby, the bicycle sprocket assembly can smoothly support the sprocket bracket in the axial direction through the spacer, even if the sprocket bracket supports the plurality of sprocket wheels.

In particular, the bicycle sprocket assembly can smoothly support the sprocket bracket in the axial direction through the spacer, even if the chain is combined with the front sprocket and the rear sprocket, so that the chain is between the front sprocket and the rear sprocket. Between tilt.

Preferably, the bicycle sprocket assembly further includes an additional sprocket. This additional sprocket is adjacent to the spacer in the axial direction, so that the spacer is disposed between the sprocket bracket and the additional sprocket. The bicycle sprocket assembly can smoothly support the sprocket bracket in the axial direction through the spacer and the additional sprocket, even if the chain is connected with the front sprocket and the rear sprocket, so that the chain is in the front Tilt between sprocket wheels.

Preferably, the bicycle sprocket assembly further includes an additional sprocket carrier. This additional sprocket bracket supports multiple additional sprocket wheels. The additional sprocket bracket is adjacent to the spacer in the axial direction, so that the spacer is disposed between the sprocket bracket and the additional sprocket bracket. This bicycle sprocket assembly can smoothly support the sprocket bracket in the axial direction by the spacer and the plurality of additional sprocket, even if the chain is connected with the front sprocket and the rear sprocket, so that the chain The front and rear sprockets are inclined.

Preferably, the bicycle sprocket assembly is constructed such that the sprocket carrier has at least one first opening that becomes a first engaging contour. The spacer has at least one axially protruding portion that becomes the second engaging contour. The at least one axial protrusion of the spacer fits 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 constructed so that the spacer has at least one second opening surrounded by the at least one axially protruding portion. Such a bicycle sprocket assembly can further reduce weight and stably prevent relative rotation of the sprocket bracket and the spacer.

Preferably, the bicycle sprocket assembly is constructed so that the sprocket bracket has a plurality of first openings that become a first engaging contour. The spacer has a plurality of axial protrusions that become the second engaging contour. The plurality of axially protruding portions of the spacer are respectively adapted to the plurality of first openings of the sprocket bracket. Such a bicycle sprocket assembly can further reduce weight and stably prevent relative rotation of the sprocket bracket and the spacer.

Preferably, the bicycle sprocket assembly is constructed so that the spacer has a plurality of second openings respectively surrounded by the plurality of axially protruding portions. Such a bicycle sprocket assembly can further reduce weight and stably prevent relative rotation of the sprocket bracket and the spacer.

Preferably, the bicycle sprocket assembly is constructed so that the first engaging contour is disposed radially inward of the plurality of sprocket wheels with respect to the rotation center axis. This bicycle sprocket assembly can smoothly support the sprocket bracket in the axial direction through the spacer, even if the chain is combined with the front sprocket and the rear sprocket so that the chain is between the front sprocket and the rear sprocket. tilt.

Preferably, the bicycle sprocket assembly is constructed so that the sprocket bracket includes a first center portion and a plurality of first arms. The plurality of first arms extend radially outward from the first central portion. A first engagement profile is provided at least partially on at least one of the plurality of first arms. This bicycle sprocket assembly can smoothly support the sprocket bracket in the axial direction through the spacer, even if the chain is combined with the front sprocket and the rear sprocket so that the chain is between the front sprocket and the rear sprocket. tilt.

Preferably, the bicycle sprocket assembly is constructed so that the spacer includes a second central portion and a plurality of second arms. The plurality of second arms extend radially outward from the second central portion. A second engagement profile is at least partially disposed on at least one of the plurality of second arms. This bicycle sprocket assembly can smoothly support the sprocket bracket in the axial direction through the spacer, even if the chain is combined with the front sprocket and the rear sprocket so that the chain is between the front sprocket and the rear sprocket. tilt.

Preferably, the bicycle sprocket assembly is constructed so that the spacer has at least one axial abutment surface. The at least one axial abutment surface surrounds the at least one axially protruding portion. The at least one axial abutment surface of the spacer is constructed to abut against the sprocket bracket in the assembled state. The bicycle sprocket assembly can improve the assembly efficiency of the spacer and the sprocket bracket.

Preferably, the bicycle sprocket assembly is constructed so that the spacer has a plurality of axial abutment surfaces. The plurality of axial abutment surfaces respectively surround the plurality of axial protruding portions. The plurality of axial abutment surfaces of the spacer are constructed to abut against the sprocket bracket in the assembled state. The bicycle sprocket assembly can further improve the assembly efficiency of the spacer and the sprocket bracket.

Preferably, the bicycle sprocket assembly is constructed so that the at least one axially protruding portion and the spacer are integrally formed as a single one-piece member. Such a bicycle sprocket assembly can be efficiently manufactured in addition to improving the assembly efficiency of the spacer.

Preferably, the bicycle sprocket assembly is constructed so that the plurality of axially protruding portions and the spacer are integrally formed as a single one-piece member. Such a bicycle sprocket assembly can be efficiently manufactured in addition to improving the assembly efficiency of the spacer.

Preferably, the bicycle sprocket assembly further includes a plurality of additional sprocket wheels. The bicycle sprocket assembly can have a wide range of gears.

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

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

Preferably, the bicycle sprocket assembly is constructed so that the spacer does not have a hub engaging profile. The bicycle sprocket assembly can improve the assembly efficiency of the spacer and the sprocket bracket.

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

Thereby, the bicycle sprocket assembly can smoothly support one of the sprocket bracket and the sprocket in the axial direction through the spacer, even if the chain is connected to the front sprocket and the rear sprocket so that the chain is in The front and rear sprockets are inclined. In addition, the bicycle sprocket assembly can improve the assembly efficiency of the spacer and one of the sprocket bracket and the sprocket.

Preferably, the bicycle sprocket assembly is constructed so that one of the sprocket bracket and the sprocket has at least one first opening that becomes a first engagement profile. The spacer has at least one axially protruding portion that becomes the second engaging contour. The at least one axially protruding portion of the spacer fits the at least one first opening of one of the sprocket bracket and the sprocket. Such a bicycle sprocket assembly can reduce the weight of one of the sprocket carrier and the sprocket. Also, the bicycle sprocket assembly can effectively prevent relative rotation of the spacer and one of the sprocket carrier and the sprocket.

Preferably, the bicycle sprocket assembly is constructed so that the spacer has at least one second opening surrounded by the at least one axially protruding portion. Such a bicycle sprocket assembly can reduce the weight of the spacer. Also, the bicycle sprocket assembly can effectively prevent relative rotation of the spacer and one of the sprocket carrier and the sprocket.

Preferably, the bicycle sprocket assembly is constructed so that one of the sprocket bracket and the sprocket includes a first center portion and a plurality of first arms. The plurality of first arms extend radially outward from the first central portion. A first engagement profile is provided at least partially on at least one of the plurality of first arms. Such a bicycle sprocket assembly can reduce the weight of one of the sprocket carrier and the sprocket. Moreover, the bicycle sprocket assembly can smoothly support one of the sprocket bracket and the sprocket in the axial direction through the spacer, even if the chain is connected to the front sprocket and the rear sprocket to make the chain Tilt between the front and rear sprockets.

Preferably, the bicycle sprocket assembly is constructed so that the spacer includes a second central portion and a plurality of second arms. The plurality of second arms extend radially outward from the second central portion. A second engagement profile is at least partially disposed on at least one of the plurality of second arms. Such a bicycle sprocket assembly can reduce the weight of the spacer. Moreover, the bicycle sprocket assembly can smoothly support one of the sprocket bracket and the sprocket in the axial direction through the spacer, even if the chain is connected to the front sprocket and the rear sprocket to make the chain Tilt between the front and rear sprockets.

Preferably, the bicycle sprocket assembly is constructed so that the spacer has at least one axial abutment surface. The at least one axial abutment surface surrounds the at least one axially protruding portion. The at least one axial abutment surface of the spacer is constructed to abut against one of the sprocket bracket and the sprocket in the assembled state. Such a bicycle sprocket assembly can improve the assembly efficiency of the spacer and one of the sprocket carrier and the sprocket.

Preferably, the bicycle sprocket assembly is constructed so that the second engaging contour and the spacer are integrally formed as a single one-piece member. Such a bicycle sprocket assembly can be operated stably, even if the chain is combined with the front sprocket and the rear sprocket so that the chain is inclined between the front sprocket and the rear sprocket.

Embodiments of the invention will be described below with reference to the drawings forming part of this original disclosure.

In an embodiment, the following directional terms "forward", "backward", "left", "right", "high", "low", "up", and "down" and any other similar directional terms refer to These are the directions determined by the cyclist who is sitting on the bicycle's bicycle seat (see Figure 1) and facing the bicycle handlebar (see Figure 1).

As shown in FIG. 1, the bicycle 1 includes a bicycle chain 9, a frame 11, a handlebar 13, a front wheel 17, a rear wheel 19, a shifting device 24, a driving portion 25, and a front fork 39.

A front fork 39 is rotatably attached to the frame 11. The handlebar 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 a rear portion of the frame 11 via a rear hub assembly 29. The front tire 17 a is attached to the front wheel 17. The rear tire 19 a is attached to the rear wheel 19.

The shifting device 24 is attached to the handlebar 13. The shifting device 24 operates the rear derailleur 26 via the control cable 22. With the shifting device 24, the rear derailleur 26 moves the bicycle chain 9 from one rear sprocket of the bicycle rear sprocket assembly 28 (an example of a bicycle sprocket assembly) to the other of the bicycle rear sprocket assembly 28 Rear sprockets. Multiple rear sprockets are shown in a simplified manner in FIG. 1. The rear derailleur 26 is attached to the rear portion of the frame 11, for example.

The driving part 25 mainly includes a crank assembly 27 and a bicycle rear sprocket assembly 28. Specifically, the driving section 25 mainly 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 a 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 is engaged with the bicycle chain 9.

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

As shown 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 an outer portion of the rear hub assembly 29. The outer portion is constructed to rotate relative to the hub shaft 51 of the rear hub assembly 29. The hub shaft 51 is attached to a rear portion of the frame 11.

As shown in FIGS. 2 to 4, the bicycle rear sprocket assembly 28 has a rotation center axis C1. As shown in FIGS. 3 and 4, the bicycle rear sprocket assembly 28 includes a sprocket bracket 30 and a first spacer 31 (an example of a spacer). Specifically, the bicycle rear sprocket assembly 28 includes a first sprocket 32A and a second sprocket 32B (examples of a plurality of sprocket), a sprocket bracket 30, and a first spacer 31. In other words, the bicycle rear sprocket assembly 28 includes a plurality of sprocket wheels 32A and 32B, a sprocket bracket 30, and a spacer 31. As shown in FIG. 4, the bicycle rear sprocket assembly 28 further includes a second spacer 33A, a third spacer 33B, a fourth spacer 33C, a fifth spacer 33D, and a sixth spacer 33E.

As shown 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 further includes an additional sprocket 32C. The bicycle rear sprocket assembly 28 further includes a fourth sprocket 32D, a fifth sprocket 32E, a sixth sprocket 32F, a seventh sprocket 32G, an eighth sprocket 32H, a ninth sprocket 32I, and a tenth sprocket. 32J (example of multiple additional sprockets). In other words, the bicycle rear sprocket assembly 28 further includes a plurality of additional sprocket wheels 32D to 32J.

As shown in FIG. 2, the first to tenth sprocket wheels 32A to 32J have different diameters, respectively. The first to tenth sprocket wheels 32A to 32J each include a plurality of teeth for engaging the bicycle chain 9. The plurality of teeth are provided on an outer peripheral portion of each of the first to tenth sprocket wheels 32A to 32J.

As shown in FIGS. 2 and 4, the first sprocket 32A is formed in a substantially annular shape. The first sprocket 32A is constructed so that the outer diameter of the first sprocket 32A is the largest among the first to tenth sprocket 32A to 32J. The first sprocket 32A is attached to the sprocket bracket 30 by a fixing member 34 such as a rivet.

The second sprocket 32B is provided at a distance from the first sprocket 32A in an axial direction with respect to the rotation center axis C1. The second sprocket 32B is formed in a substantially annular shape. The second sprocket 32B is constructed so that the outer diameter of the second sprocket 32B is smaller than the outer diameter of the first sprocket 32A. The second sprocket 32B is attached to the sprocket bracket 30 by a fixing member 34 such as a rivet.

The third sprocket 32C is provided at a distance from the second sprocket 32B in an axial direction with respect to the rotation center axis C1. The third sprocket 32C is adjacent to the first spacer 31 in the axial direction, so that the first spacer 31 is disposed between the sprocket bracket 30 and the third sprocket 32C. In other words, the additional sprocket 32C is adjacent to the spacer 31 in the axial direction, so that the spacer 31 is disposed between the sprocket bracket 30 and the additional sprocket 32C. The third sprocket 32C is constructed so that the outer diameter of the third sprocket 32C is smaller than the outer diameter of the second sprocket 32B.

The fourth to tenth sprocket wheels 32D to 32J are respectively spaced from each other with respect to the axial direction with respect to the rotation center axis C1. The fourth to tenth sprocket wheels 32D to 32J are constructed so that the outer diameter of each of the fourth to tenth sprocket wheels 32D to 32J decreases from the third sprocket 32C toward the tenth sprocket 32J.

As shown in FIG. 4, the third to tenth sprocket wheels 32C to 32J each have a hub engagement profile 32Ca, 32Da, 32Ea, 32Fa, 32Ga, 32Ha, 32Ia, 32Ja. Respective hub engagement profiles 32Ca to 32Ja of the third to tenth sprocket wheels 32C to 32J are provided on respective inner peripheral portions of the third to tenth sprocket wheels 32C to 32J. The hub engagement profiles 32Ca to 32Ja are engaged with the rear hub assembly 29 (see FIG. 1). For example, the respective hub engagement profiles 32Ca to 32J of the third to tenth sprocket wheels 32C to 32J are configured by spline in a state where the bicycle rear sprocket assembly 28 is mounted on the rear hub assembly 29. And engaged with the rear hub assembly 29.

As shown in FIG. 4, the sprocket bracket 30 supports a first sprocket 32A and a second sprocket 32B (an example of a plurality of sprocket). For example, one side of the sprocket bracket 30 supports the first sprocket 32A. The other side of the sprocket bracket 30 supports a second sprocket 32B. This other side of the sprocket bracket 30 faces the third sprocket 32C with respect to the axial direction with respect to the rotation center axis C1.

As shown in FIG. 5, the sprocket bracket 30 includes a first central portion 30 a and a plurality of first arms 30 b. The sprocket bracket 30 has a hub engagement profile 30c. The sprocket bracket 30 has a first engagement profile 30d.

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

The plurality of first arms 30b extend radially outward from the first central portion 30a. Each of the plurality of first arms 30b is provided at a distance from each other with respect to a circumferential direction with respect to the rotation center axis C1.

The proximal end of the first arm 30b is connected to the first central portion 30a. For example, the proximal end of the first arm 30b and the first central portion 30a are integrally formed as a single one-piece member. The first sprocket 32A and the second sprocket 32B are attached to a distal end portion of each of the first arms 30 b by a fixing member 34 such as a rivet.

The hub engaging profile 30c is provided on an inner peripheral portion of the first center portion 30a. The hub engagement profile 30c is engaged with the rear hub assembly 29. For example, the hub engaging profile 30c is engaged with the rear hub assembly 29 by the bolt groove engagement in the mounted state of the bicycle rear sprocket assembly 28 (see FIG. 1).

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

As shown in FIG. 5, the sprocket bracket 30 has at least one first opening 30 d that becomes a first engagement profile. In this embodiment, the sprocket bracket 30 has a plurality of first openings 30d that become a first engagement profile.

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

As shown in FIG. 4, each first opening 30 d is provided between the rotation center axis C1 and the first and second sprocket wheels 32A and 32B. Specifically, each first opening 30d is provided between the first central portion 30a and the first and second sprocket wheels 32A and 32B with respect to a radial direction with respect to the rotation center axis C1.

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

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

Specifically, the first spacer 31 is provided between the sprocket bracket 30 and the third sprocket 32C with respect to the axial direction with respect to the rotation center axis C1. The first spacer 31 supports the sprocket bracket 30 by being engaged with and abutting against the sprocket bracket 30 and the third sprocket 32C.

As shown in FIG. 6, the first spacer 31 (an example of the spacer) includes a second central portion 31a and a plurality of second arms 31b. The first spacer 31 (an example of the spacer) has a second engagement profile 31c. The first spacer 31 (an example of a spacer) has at least one axial abutment surface 31d. 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 provided on the inner peripheral side of the second center portion 31a.

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

A proximal end portion of the second arm 31b is connected to the second central portion 31a. For example, the proximal end portion of the second arm 31b and the second central portion 31a are integrally formed as a single one-piece member.

As shown in FIGS. 4 and 6, the second engagement profile 31 c is constructed to be engaged with the first engagement profile 30 d of the sprocket bracket 30. The second engagement contour 31c is provided on the radially inner side of the first sprocket 32A and the second sprocket 32B with respect to the rotation center axis C1. The second engagement contour 31c is at least partially provided on at least one of the plurality of second arms 31b. In this embodiment, a second engagement profile 31c is provided on each of the plurality of second arms 31b. The second engagement profile 31c is integrally formed with the first spacer 31 (an example of the spacer) as a single one-piece member.

The first spacer 31 (an example of the spacer) has at least one axially projecting portion 31c that becomes the second engagement profile. The at least one axially protruding portion 31c of the first spacer 31 (an example of a spacer) fits the at least one first opening 30d of the sprocket bracket 30. The at least one axially protruding portion 31c and the first spacer 31 (an example of the spacer) are integrally formed as a single one-piece member.

In this embodiment, the first spacer 31 (an example of the spacer) has a plurality of axially projecting portions 31c that become the second engaging contour. Each of the plurality of axial protruding portions 31 c protrudes from the first spacer 31 in the axial direction. Specifically, each of the plurality of axial protruding portions 31c protrudes from each second arm 31b in the axial direction. Preferably, the plurality of axial protruding portions 31c and the first spacer 31 are integrally formed as a single one-piece member.

The plurality of axially protruding portions 31 c of the first spacer 31 (an example of the spacer) are respectively adapted to the plurality of first openings 30 d of the sprocket bracket 30. In this embodiment, the axially protruding portion 31c is inserted into the first opening 30d of the sprocket bracket 30 and is connected to the sprocket bracket 30 by, for example, elastic engagement, press-fitting engagement, or the like. The first opening 30d is joined.

As shown in FIGS. 4 and 6, the first spacer 31 (an example of the spacer) has at least one second opening 31e surrounded by the axially protruding portion 31c. In this embodiment, the first spacer 31 (an example of the spacer) has a plurality of second openings 31e surrounded by the plurality of axially protruding portions 31c, respectively.

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

As shown in FIGS. 4 and 6, the at least one axial abutment surface 31 d of the first spacer 31 (an example of a spacer) is constructed to abut against the sprocket bracket 30 in the assembled state. The at least one axial abutment surface 31d surrounds the at least one axially protruding portion 31c. In this embodiment, the first spacer 31 (an example of a spacer) has a plurality of axial abutment surfaces 31d respectively surrounding the plurality of axial protruding portions 31c. The plurality of axial abutment surfaces 31d are constructed to abut against the sprocket bracket 30 in the assembled state. The plurality of axial abutment surfaces 31d are respectively provided on the second arm 31b around the proximal ends of the axially protruding portions 31c.

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

The second spacer 33A is provided between the third sprocket 32C and the fourth sprocket 32D in an axial direction with respect to the rotation center axis C1. The third spacer 33B is provided between the fourth sprocket 32D and the fifth sprocket 32E in the axial direction.

The fourth spacer 33C is provided between the fifth sprocket 32E and the sixth sprocket 32F in the axial direction. The fifth spacer 33D is provided between the sixth sprocket 32F and the seventh sprocket 32G in the axial direction. The sixth spacer 33E is provided 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 center portion 32Ib of the ninth sprocket 32I is constructed to abut against the eighth sprocket 32H in the axial direction. The center portion 32Ib of the ninth sprocket 32I protrudes from the ninth sprocket 32I in the axial direction 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 constructed to abut the ninth sprocket 32I in the axial direction. The center portion 32Jb of the tenth sprocket 32J protrudes from the tenth sprocket 32J in the axial direction toward the ninth sprocket 32I.

The bicycle rear sprocket assembly 28 described above is attached to the rear hub assembly 29 as described below. First, the first sprocket 32A and the second sprocket 32B are fixed to the sprocket bracket 30. The first spacer 31 is attached to the sprocket bracket 30 by fitting the axially protruding portion 31c to the first opening 30d and abutting against the sprocket bracket 30 via the axial abutment surface 31d. 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 any bolt grooved portion in this embodiment to engage with the rear hub assembly 29.

Next, the sprocket bracket 30 is engaged on the outer peripheral portion of the rear hub assembly 29 by bolt-groove engagement. The third sprocket 32C is provided on an outer peripheral portion of the rear hub assembly 29 such that the third sprocket 32C abuts against the first spacer 31 in an axial direction with respect to the rotation center axis C1.

The fourth to eighth sprocket wheels 32D to 32H are provided on the outer peripheral portion of the rear hub assembly 29 by bolt-groove joints via the second to sixth spacers 33A to 33E, respectively.

The ninth sprocket 32I is provided on the outer peripheral portion of the rear hub assembly 29 with bolt and groove engagement, so that the center portion 32Ib of the ninth sprocket 32I abuts on the axial direction with respect to the rotation center axis C1. Eighth sprocket 32H.

The tenth sprocket 32J is attached to the rear hub assembly 29 by bolt-groove engagement, so that the center portion 32Jb of the tenth sprocket 32J abuts against the ninth sprocket 32I in the axial direction with respect to the rotation center axis C1.

Finally, the sprocket bracket 30, the third to tenth sprocket wheels 32C to 32J, and the first to sixth spacers 31 and 33A to 33E are attached to the locking member 37 of the rear hub assembly 29 (see FIG. 4) while being positioned.

As a variation of the first embodiment, the sprocket bracket 30 may support three or more sprocket wheels. In addition, the sprocket bracket 30 may be made of a metal material such as aluminum, titanium, iron, or the like, or a non-metal material such as plastic, fiber reinforced plastic, or the like.

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

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

The additional sprocket bracket is adjacent to the first spacer 31 in the axial direction, so that the first spacer 31 (an example of the spacer) is disposed between the sprocket bracket 30 and the additional sprocket bracket. Specifically, the first spacer 31 is provided 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 description of a configuration substantially the same as that of the first embodiment is omitted in the second embodiment. Regarding the description which will be omitted below, the description of the first embodiment is applicable to the second embodiment.

In the second embodiment, the bicycle rear sprocket assembly 128 (an example of a bicycle sprocket assembly) has a rotation center axis C1. As shown in FIG. 8, the first sprocket 132A functions as the sprocket bracket 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 bracket 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 an axial direction with respect to the rotation 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 which is constructed to be engaged with a third engagement profile 132d (an example of the 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 the spacer) has at least one axially projecting portion 31c that becomes the second engagement profile. The at least one axial protruding portion 31c of the first spacer 31 fits 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 31d. The at least one axial abutment surface 31d of the first spacer 31 (an example of a spacer) is constructed to abut against the first sprocket 132A (an example of a sprocket) in an assembled state.

The bicycle rear sprocket assembly 128 further includes a second sprocket 132B (an example of an additional sprocket). The bicycle rear sprocket assembly 128 further includes a third sprocket 132C, a fourth sprocket 132D, a fifth sprocket 132E, a sixth sprocket 132F, a seventh sprocket 132G, an eighth sprocket 132H, and a ninth sprocket. 132I (example of multiple additional sprockets). The bicycle rear sprocket assembly 128 further includes second to sixth spacers 33A to 33E.

The configuration of the first spacer 31 is the same as that in the first embodiment (see FIG. 6). The configurations of the second to ninth sprocket 132B to 132I correspond to the configurations of the third to tenth sprocket 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 in the first embodiment (see FIG. 4). Therefore, the description of these configurations is omitted in the second embodiment.

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

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

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

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

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

The third engagement contour 132 d is constructed to be engaged with the second engagement contour 31 c of the first spacer 31. The third engagement contour 132d is provided on the radially inner side of the outer peripheral portion 132c with respect to the rotation center axis C1.

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

The first sprocket 132A has at least one third opening 132d (an example of at least one first opening) that becomes a third engaging profile (an example of the first engaging profile). For example, the first sprocket 132A has a plurality of third openings 132d that become a third engagement profile.

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

Each third opening 132d is provided between the outer peripheral portion 132c and the rotation center axis C1. Specifically, each third opening 132d is provided between the outer peripheral portion 132c and the third central portion 132a with respect to a radial direction with respect to the rotation center axis C1.

The hub engagement profile 132e is provided on an inner peripheral portion of the third center portion 132a. The hub engagement profile 132e is engaged with the rear hub assembly 29. For example, the hub engagement profile 132e is engaged with the rear hub assembly 29 by the bolt groove engagement in the mounted state where the bicycle rear sprocket assembly 128 is mounted on the rear hub assembly 29.

The above-mentioned bicycle rear sprocket assembly 128 is attached to the rear hub assembly 29 as described below. First, the first spacer 31 is attached to the first sprocket 132A by fitting the axial protruding portion 31c to the third opening 132d and abutting the first sprocket 132A via the axial abutment surface 31d. 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 any bolt grooved portion in this embodiment to engage with the rear hub assembly 29.

Secondly, the first sprocket 132A is provided on the outer peripheral portion of the rear hub assembly 29 with bolt and groove engagement. The second sprocket 132B is provided on an outer peripheral portion of the rear hub assembly 29 such that the second sprocket 132B abuts against the first spacer 31 in an axial direction with respect to the rotation center axis C1.

The third to seventh sprocket wheels 132C to 132G are provided on the outer peripheral portion of the rear hub assembly 29 via bolt-groove joints through the second to sixth spacers 33A to 33E, respectively.

The eighth sprocket 132H is provided on the outer peripheral portion of the rear hub assembly 29 with a bolt-groove engagement so that the center portion 132Ha of the eighth sprocket 132H abuts against the axial direction with respect to the rotation center axis C1 The seventh sprocket 132G.

The ninth sprocket 132I is attached to the rear hub assembly 29 by bolt-groove engagement, so that the center portion 132Ia of the ninth sprocket 132I abuts on the eighth sprocket 132H.

Finally, the first to ninth sprocket wheels 132A to 132I and the first to sixth spacers 31 and 33A to 33E are positioned by the locking member 37 attached to the rear hub assembly 29.

As a variation of the second embodiment, as shown in FIG. 7, the first spacer 31 may have a hub engagement profile 31f. In this case, for example, the hub engagement profile 31f of the first spacer 31 is engaged with the rear hub assembly 29 by the bolt groove engagement.

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

The bicycle rear sprocket assembly 28, 128 (an example of a bicycle sprocket assembly) has a rotation center axis C1. The bicycle rear sprocket assemblies 28 and 128 include one of a sprocket bracket 30 and a first sprocket 132A (an example of a sprocket), and a first spacer 31 (an example of a spacer).

One of the sprocket bracket 30 and the first sprocket 132A (an example of a sprocket) includes a first center portion 30a or a third center portion 132a, and a plurality of first arms 30b or a plurality of third arms 132b. One of the sprocket bracket 30 and the first sprocket 132A has a first engagement profile 30d or a third engagement profile 132d, and a hub engagement profile 30c, 132e.

The plurality of first arms 30b or third arms 132b extend radially outward from the first central portion 30a or the third central portion 132a. The first engagement profile 30d or the third engagement profile 132d is at least partially provided on at least one of the plurality of first arms 30b or the third arms 132b. One of the sprocket bracket 30 and the first sprocket 132A (an example of a sprocket) has at least one first opening 30d or a third opening 132d that becomes a first engagement profile or a third engagement profile.

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

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

The plurality of second arms 31b extend radially outward from the second central portion 31a. The second engagement profile 31c is configured to be engaged with the first engagement profile 30d or the third engagement profile 132d of one of the sprocket bracket 30 and the first sprocket 132A.

The second engagement contour 31c is at least partially provided on at least one of the plurality of second arms 31b. The second joint profile 31c is integrally formed with the first spacer 31 as a single one-piece member.

The first spacer 31 (an example of the spacer) has at least one axially projecting portion 31c that becomes the second engagement profile. The at least one axially protruding portion 31c of the first spacer 31 fits the at least one first opening 30d or the third opening 132d of one of the sprocket bracket 30 and the first sprocket 132A. .

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

In understanding the scope of this disclosure, the terms "part," "section," "portion," "component," or "component" may have the dual meaning of a single part and multiple parts when used in the singular.

Also, the following directional terms "forward", "backward", "upward", "downward", "upright or vertical", "horizontal", "downward", and "direction" are used to describe the above embodiments. "Lateral" and any other similar directional terms refer to those directions of the bicycle sprocket assembly.

Therefore, these terms should be interpreted relative to the bicycle sprocket assembly when used to describe the technology.

1‧‧‧ bicycle

9‧‧‧ Bicycle chain

11‧‧‧frame

13‧‧‧Handlebar

17‧‧‧ front wheels

17a‧‧‧ Front tire

19‧‧‧ rear wheels

19a‧‧‧ rear tire

22‧‧‧Control cable

24‧‧‧shift device

25‧‧‧Driver

26‧‧‧ rear derailleur

27‧‧‧ crank assembly

28‧‧‧ Bicycle rear sprocket assembly, bicycle sprocket assembly

29‧‧‧ rear wheel assembly

30‧‧‧Sprocket bracket

30a‧‧‧First Central Section

30b‧‧‧First arm

30c‧‧‧Wheel engagement profile

30d‧‧‧First joint contour, first opening

31‧‧‧First spacer, spacer

31a‧‧‧Second Central Section

31b‧‧‧Second arm

31c‧‧‧Second joint profile, axially protruding part

31d‧‧‧Axial abutment surface

31e‧‧‧Second opening

31f‧‧‧Wheel engagement profile

32A‧‧‧First sprocket, sprocket

32B‧‧‧Second sprocket, sprocket

32C‧‧‧Third sprocket, additional sprocket

32D‧‧‧Fourth sprocket, additional sprocket

32E‧‧‧Fifth sprocket, additional sprocket

32F‧‧‧ Sixth sprocket, additional sprocket

32G‧‧‧Sprocket, additional sprocket

32H‧‧‧eighth sprocket, additional sprocket

32I‧‧‧9th sprocket, additional sprocket

32J‧‧‧10th sprocket, additional sprocket

32Ca‧‧‧Wheel engagement profile

32Da‧‧‧Wheel engagement profile

32Ea‧‧‧Wheel engagement profile

32Fa‧‧‧Wheel engagement profile

32Ga‧‧‧Wheel engagement profile

32Ha‧‧‧Wheel engagement profile

32Ia‧‧‧Wheel engagement profile

32Ja‧‧‧Wheel engagement profile

32Ib‧‧‧Center

32Jb‧‧‧Center

33A‧‧‧Second spacer

33B‧‧‧Third spacer

33C‧‧‧Fourth spacer

33D‧‧‧Fifth spacer

33E‧‧‧Sixth spacer

34‧‧‧Fixed components

35‧‧‧ front sprocket

37‧‧‧Locking member

39‧‧‧ Fork

51‧‧‧ Wheel Hub

128‧‧‧ Bicycle rear sprocket assembly, bicycle sprocket assembly

132A‧‧‧First sprocket, sprocket

132B‧‧‧Second Sprocket

132C‧‧‧Third Sprocket

132D‧‧‧Fourth sprocket

132E‧‧‧Fifth sprocket

132F‧‧‧The sixth sprocket

132G‧‧‧Seventh Sprocket

132H‧‧‧eighth sprocket

132I‧‧‧9th sprocket

132a‧‧‧Third Central Section

132b‧‧‧ Third arm

132c‧‧‧outer periphery

132d‧‧‧ Third joint profile, third opening

132e‧‧‧Wheel engagement profile

C1‧‧‧rotation center axis

FIG. 1 is a side view of a bicycle according to a first embodiment of the present invention.

FIG. 2 is an outside perspective view of a bicycle rear sprocket assembly according to a first embodiment of the present invention.

3 is an inside perspective view of a bicycle rear sprocket assembly according to a first embodiment of the present invention.

FIG. 4 is a perspective view of an inside cross-section of a bicycle rear sprocket assembly according to a first embodiment of the present invention.

Fig. 5 is a perspective view of a sprocket bracket 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 which is a variation according to the first embodiment of the present invention.

Fig. 8 is a perspective view of the inside cross-section of a bicycle rear sprocket assembly according to a second embodiment of the present invention.

FIG. 9 is a perspective view of an inner cross section of a first sprocket and a spacer according to a second embodiment of the invention.

Claims (27)

A bicycle sprocket assembly (28) having a rotation center axis (C1). The bicycle sprocket assembly (28) includes: multiple sprocket wheels (32A, 32B); a sprocket bracket (30) which supports the A plurality of sprocket wheels (32A, 32B) and having a first engagement profile (30d); and a spacer (31) adjacent to the sprocket bracket (31) in an axial direction with respect to the rotation center axis (C1) ( 30), the spacer (31) supports the sprocket bracket (30) in the axial direction and has a second engaging profile (31c), the second engaging profile (31c) is constructed to form the sprocket bracket The first joining profile (30d) of (30) is joined. The bicycle sprocket assembly (28) according to item 1 of the scope of patent application, further comprising: an additional sprocket (32C), which is adjacent to the spacer (31) in the axial direction, so that the spacer (31) 31) is provided between the sprocket bracket (30) and the additional sprocket (32C). The bicycle sprocket assembly (28) according to item 1 of the patent application scope, further comprising: an additional sprocket bracket that supports a plurality of additional sprocket wheels, wherein the additional sprocket brackets are adjacent in the axial direction With the spacer (31), the spacer (31) is disposed between the sprocket bracket (30) and the additional sprocket bracket. The bicycle sprocket assembly (28) according to any one of claims 1 to 3, wherein the sprocket bracket (30) has at least one first An opening (30d), the spacer (31) has at least one axially protruding portion (31c) that becomes the second engagement profile (31c), and the at least one axially protruding portion of the spacer (31) (31c) fit the at least one first opening (30d) of the sprocket bracket (30). The bicycle sprocket assembly (28) according to item 4 of the scope of patent application, wherein the spacer (31) has at least one second opening (31e) surrounded by the at least one axially protruding portion (31c). The bicycle sprocket assembly (28) according to any one of claims 1 to 3, wherein the sprocket bracket (30) has a plurality of An opening (30d), the spacer (31) has a plurality of axially protruding portions (31c) that become the second engaging profile (31c), and the plurality of axially protruding portions of the spacer (31) (31c) are respectively adapted to the first openings (30d) of the sprocket bracket (30). The bicycle sprocket assembly (28) according to item 6 of the patent application scope, wherein the spacer (31) has a plurality of second openings (31e) surrounded by the plurality of axially protruding portions (31c), respectively. . The bicycle sprocket assembly (28) according to any one of claims 1 to 3, wherein the first engaging profile (30d) is provided in the multi-point relative to the rotation center axis (C1) The radial inner sides of the three sprocket wheels (32A, 32B). The bicycle sprocket assembly (28) according to any one of claims 1 to 3, wherein the sprocket bracket (30) includes a first center portion (30a), and A plurality of first arms (30b) extending radially outward from a central portion (30a), and the first engaging contour (30d) is at least partially disposed in at least one of the plurality of first arms (30b). One. The bicycle sprocket assembly (28) according to any one of claims 1 to 3, wherein the spacer (31) includes a second center portion (31a), and from the second center The plurality of second arms (31b) extending partly outwardly from the portion (31a), and the second engagement profile (31c) is at least partially provided on at least one of the plurality of second arms (31b). The bicycle sprocket assembly (28) according to item 9 of the scope of patent application, wherein the spacer (31) includes a second central portion (31a), and a radial direction from the second central portion (31a) A plurality of second arms (31b) extending outwardly, and the second engagement profile (31c) is at least partially provided on at least one of the plurality of second arms (31b). The bicycle sprocket assembly (28) according to item 4 of the patent application scope, wherein the spacer (31) has at least one axial abutment surface (31d) surrounding the at least one axially protruding portion (31c) And the at least one axial abutment surface (31d) of the spacer (31) is constructed to abut against the sprocket bracket (30) in an assembled state. The bicycle sprocket assembly (28) according to item 6 of the patent application scope, wherein the spacer (31) has a plurality of axial abutment surfaces (31d) respectively surrounding the plurality of axial protruding portions (31c). ), And the plurality of axial abutment surfaces (31d) of the spacer (31) are constructed to abut against the sprocket bracket (30) in an assembled state. The bicycle sprocket assembly (28) according to item 4 of the scope of patent application, wherein the at least one axial protruding portion (31c) and the spacer (31) are integrally formed as a single one-piece member. The bicycle sprocket assembly (28) according to item 6 of the scope of patent application, wherein the plurality of axially protruding portions (31c) and the spacer (31) are integrally formed as a single one-piece member. The bicycle sprocket assembly (28) as described in the first or second scope of the patent application, further comprising: a plurality of additional sprocket (32C-32J). The bicycle sprocket assembly (28) according to any one of claims 1 to 3, wherein the sprocket bracket (30) has a hub engaging profile (30c). The bicycle sprocket assembly (28) according to any one of claims 1 to 3, wherein the spacer (31) has a hub engagement profile (31f). The bicycle sprocket assembly (28) according to any one of claims 1 to 3, wherein the spacer (31) does not have a hub engaging profile (31f). A bicycle sprocket assembly (28, 128) having a rotation center axis (C1). The bicycle sprocket assembly (28, 128) includes: one of a sprocket bracket (30) and a sprocket (132A) Having a first engaging contour (30d, 132d) and a hub engaging contour (30c, 132e); and a spacer (31) adjacent to the sprocket in an axial direction with respect to the rotation center axis (C1) The one of the bracket (30) and the sprocket (132A), and the spacer (31) supports the one of the sprocket bracket (30) and the sprocket (132A) in the axial direction And has a second engagement profile (31c) which is constructed to form the first engagement profile (30d) with the one of the sprocket bracket (30) and the sprocket (132A) 132d), the spacer (31) does not have a hub engagement profile (31f). The bicycle sprocket assembly (28, 128) according to item 20 of the patent application scope, wherein the one of the sprocket bracket (30) and the sprocket (132A) has the first engaging contour ( 30d, 132d) of at least one first opening (30d, 132d), the spacer (31) has at least one axially protruding portion (31c) that becomes the second engagement profile (31c), and the spacer (31 The at least one axial protruding portion (31c) is adapted to the at least one first opening (30d, 132d) of the sprocket bracket (30) and the sprocket (132A). The bicycle sprocket assembly (28, 128) according to item 21 of the patent application scope, wherein the spacer (31) has at least one second opening (31e) surrounded by the at least one axially protruding portion (31c) ). The bicycle sprocket assembly (28, 128) according to any one of claims 20 to 22 in the scope of patent application, wherein the one of the sprocket bracket (30) and the sprocket (132A) The first central portion (30a, 132a) and a plurality of first arms (30b, 132b) extending radially outward from the first central portion (30a, 132a) are included, and the first joint profile (30d) 132d) is disposed at least partially on at least one of the plurality of first arms (30b, 132b). The bicycle sprocket assembly (28, 128) according to any one of claims 20 to 22, wherein the spacer (31) includes a second central portion (31a), and The plurality of second arms (31b) extending radially outward from the two central portions (31a), and the second engaging contour (31c) is at least partially provided in at least one of the plurality of second arms (31b). One. The bicycle sprocket assembly (28, 128) according to item 23 of the scope of patent application, wherein the spacer (31) includes a second central portion (31a), and a diameter from the second central portion (31a) A plurality of second arms (31b) extending outward, and the second engaging profile (31c) is at least partially provided on at least one of the plurality of second arms (31b). For example, the bicycle sprocket assembly (28, 128) of claim 21, wherein the spacer (31) has at least one axial abutment surface (31d) surrounding the at least one axially protruding portion (31c). And the at least one axial abutment surface (31d) of the spacer (31) is constructed to abut against one of the sprocket bracket (30) and the sprocket (132A) in an assembled state . The bicycle sprocket assembly (28, 128) according to item 20, item 21, item 22, or item 26 of the scope of patent application, wherein the second engaging contour (31c) and the spacer (31) The whole is formed into a single one-piece member.