TW202300398A - Sprocket configuration that can cover a wide range of gear-shifting - Google Patents

Abstract

To provide a sprocket configuration that can cover a wide range of gear-shifting. The sprocket configuration includes: a sprocket assembly; an adapter; and a sprocket support of the rear hub assembly for the adapter to install. The sprocket assembly includes: a plurality of sprockets and a support ring. The adapter is used to fix the sprocket assembly to the rear hub assembly. The adapter has a main adapter and a sub-adapter. The main adapter has a first main adapter end and a second main adapter end located on the opposite side of the first main adapter end in the axial direction. The sub-adapter has a first sub-adapter end and a second sub-adapter end located on the opposite side of the first sub-adapter end in the axial direction. In the assembled state of the sprocket configuration, the first sub-adapter end can be attached to and detached from the first main adapter end of the main adapter.

Description

Sprocket configuration

The present invention relates to sprocket configurations.

Known sprocket arrangements have a plurality of sprockets. Patent Document 1 discloses an example of a sprocket arrangement. [Prior Art Literature] [Patent Document]

[Patent Document 1] Specification of U.S. Patent Application Publication No. 2017/0341707

[Problem to be solved by the invention]

In the sprocket arrangement disclosed in Patent Document 1, there is room for improvement in expanding the shift range. In particular, in the sprocket arrangement disclosed in Patent Document 1, a small-diameter sprocket with a total number of teeth of 9 or less cannot be attached to the rear hub assembly. The object of the present invention is to provide a sprocket configuration, which can install a small-diameter sprocket with a total number of teeth of less than 9 on the rear hub assembly, and can cover a wide range of speed changes. [Means to solve the problem]

The sprocket arrangement of the first type of the present invention is a sprocket arrangement mounted on a rear hub assembly for a human-driven vehicle, and the sprocket arrangement includes: a sprocket assembly and an adapter; The sprocket supporting body in the above-mentioned rear hub assembly; the above-mentioned sprocket assembly includes: a plurality of sprockets and a support ring; connected to form an internal space radially inward with respect to the axis of rotation of the above-mentioned sprocket assembly, and have different numbers of teeth; the above-mentioned support ring has a torque for transmitting torque to the above-mentioned rear hub assembly The transmission part is connected to one of the above-mentioned multiple sprockets; the above-mentioned adapter is used to fix the above-mentioned sprocket assembly to the above-mentioned rear hub assembly in the axial direction relative to the above-mentioned rotation center axis; the above-mentioned adapter Equipped with a main adapter and a sub-adapter; the above-mentioned main adapter has: a first main adapter end, and a second end located on the opposite side of the first main adapter end in the axial direction The end of the main adapter; the end of the second main adapter is disposed on the hub body of the rear hub assembly closer to the end of the first main adapter in the above-mentioned installed state; the sub-adapter It has: the end of the first sub-adapter, the end of the second sub-adapter on the opposite side of the end of the first sub-adapter in the axial direction; in the assembled state of the sprocket arrangement, the above The first sub-adapter end can be attached to and detached from the first main adapter end of the main adapter. With the first type of sprocket arrangement, the adapter has a sub-adapter. The sub-adapter has a structure extending in the axial direction relative to the rotation center axis, and can attach and detach the main adapter. Thereby, in the rear sprocket assembly in which a plurality of sprockets are connected to each other so as to form an internal space radially inward with respect to the rotation center axis, small-diameter sprockets with a total number of teeth of 9 or less can be attached to the rear hub. Assembly. Therefore, a light-weight and wide-ranging sprocket arrangement can be achieved.

According to the sprocket arrangement of the second aspect of the first aspect of the present invention, the plurality of sprockets are integrated with each other by a single member. According to the sprocket arrangement of the second type, fastening members such as rivets are unnecessary compared with the case where a plurality of sprockets are assembled by a plurality of different components. Therefore, compared with a plurality of sprocket assemblies constituted by assembling a plurality of components, it is possible to achieve a sprocket assembly that is superior in strength and lighter in weight.

According to the sprocket arrangement of the third aspect of the first aspect of the present invention, the plurality of sprockets are connected to each other by a plurality of rivets. With the sprocket arrangement of the third type, compared with the case of forming a single part including plural sprockets, forming a plurality of sprockets is easier to process, so a sprocket assembly with excellent manufacturing efficiency can be achieved.

According to the sprocket arrangement of the fourth type in any one of the first to third types of the present invention, the plurality of sprockets includes the smallest sprocket with the number of teeth being 9 or less, and the smallest sprocket is in the assembled state Supported by the above-mentioned sub-adapter. With the fourth type of sprocket arrangement, it is possible to form a wide range of sprocket arrangements including the smallest sprocket with 9 teeth or less.

According to the sprocket arrangement of the fifth aspect of the fourth aspect of the present invention, the smallest sprocket has an opening having a diameter smaller than an outer diameter of the sprocket support body of the rear hub assembly. With the sprocket arrangement of the fifth type, the smallest sprocket has an opening whose diameter is smaller than the outer diameter of the sprocket support body of the rear hub assembly. The smallest sprocket with a small width from the outer periphery can further improve the bending strength.

According to the sprocket configuration of the sixth form of any one of the first to fifth forms of the present invention, the above-mentioned sub-adapter includes: from the end of the above-mentioned first sub-adapter toward the above-mentioned A cylindrical portion extending from the end portion of the second sub-adapter, and a flange portion extending radially outward from the end portion of the second sub-adapter with respect to the axis of the rotation center. With the sprocket arrangement of the sixth aspect, the flange portion can suppress the movement of the sprocket assembly mounted on the rear hub assembly in the axial direction.

According to the sprocket arrangement according to the seventh aspect of the sixth aspect of the present invention, the flange portion has a radial outer surface with respect to the axis of the rotation center and an axial outer surface with respect to the axis of the rotation center. ; At least one tool engaging surface is formed on at least one of the radially outer surface and the axially outer surface. According to the sprocket arrangement of the seventh aspect, since the tool engaging surface is formed on at least one of the radially outer surface and the axially outer surface, it is easy to engage the tool with the tool engaging surface. Therefore, it is easy to attach and detach the adapter to the sprocket support body, and it is easy to attach and detach the sub-adapter to and from the main adapter.

According to the sprocket arrangement of the eighth aspect of the sixth or seventh aspect of the present invention, the cylindrical portion has a maximum outer diameter smaller than the outer diameter of the sprocket support body of the rear hub assembly. According to the sprocket arrangement of the eighth mode, a sprocket having an opening smaller than the outer diameter of the sprocket support can be attached to the rear hub assembly.

According to the sprocket configuration of the ninth form of any one of the first to eighth forms of the present invention, the above-mentioned main adapter includes an internal thread part, and the above-mentioned internal thread part is used for screwing in the above-mentioned installation state The external thread part provided in the said sprocket support body of the said rear hub assembly. With the sprocket arrangement of the ninth type, the main adapter is mounted on the sprocket supporting body by screwing, so the installation of the main adapter is easy.

According to the sprocket arrangement of the tenth aspect of the ninth aspect of the present invention, the female thread portion is arranged closer to the end of the second main adapter than the end of the first main adapter. With the tenth type of sprocket arrangement, it is possible to easily form the female thread portion on the main adapter. Specifically, since the end portion of the first main adapter is detachably provided on the sub-adapter, the area where the internal thread portion can be formed is limited. There is a high degree of freedom in the region where the female thread portion can be formed around the end portion of the opposing second main adapter. Therefore, the internal thread portion can be easily formed on the main adapter.

According to the sprocket configuration of the eleventh form of any one of the first to tenth forms of the present invention, the above-mentioned main adapter includes an additional threaded portion, and the above-mentioned additional threaded portion is arranged on the first main adapter and is used to be screwed to the threaded portion provided at the end of the first sub-adapter of the above-mentioned sub-adapter. With the eleventh type of sprocket arrangement, the sub-adapter can be installed on the main adapter by screwing.

According to the sprocket arrangement of the twelfth form of any one of the first to eleventh forms of the present invention, the above-mentioned sub-adapter has an internal opening, and the internal opening is used for the above-mentioned rear in the above-mentioned installed state. The hub shaft of the hub assembly is inserted, and the diameter of the inner opening is 19.2 mm or more and 21.3 mm or less. With the sprocket arrangement of the twelfth type, since the diameter of the inner opening of the sub-adapter is 19.2 mm or more, a hub shaft with a diameter of less than 19.2 mm can be inserted through the sub-adapter. Since the diameter of the inner opening of the sub-adapter is 21.3 mm or less, the strength of the sub-adapter can be improved compared to a sub-adapter whose inner opening is larger than 21.3 mm. And by making the diameter of the inner opening of the sub-adapter 21.3 mm or less, the outer diameter of the sub-adapter can be set smaller, and the outer diameter of the sprocket support body with the rear hub assembly can be made smaller. The small-diameter sprocket with a small opening is attached to the sprocket support body of the rear hub assembly.

According to the sprocket arrangement of a thirteenth aspect of any one of the first to twelfth aspects of the present invention, the torque transmission portion of the support ring includes a plurality of spline grooves. With the sprocket arrangement of the thirteenth aspect, the torque of the sprocket assembly can be efficiently transmitted to the rear hub assembly via the torque transmission portion. [Invention effect]

By means of the sprocket configuration of the present invention, it is possible to cover a wide range of speed changes.

Referring to FIG. 1 and FIG. 2 , the sprocket arrangement 6 mounted on the rear hub assembly 4 for a human-powered vehicle will be described. A human-powered vehicle has two or more wheels and is a vehicle that can be driven by at least human power. Human-powered vehicles include, for example, various types of bicycles such as mountain bikes, road bikes, city bikes, cargo bikes, hand-cranked bicycles, and recumbent bicycles. The number of wheels that the human-powered vehicle has is not limited. A human-powered vehicle includes, for example, a vehicle having two or more wheels. A human-powered vehicle is not limited to a vehicle driven only by human power. Human-powered vehicles include: electric bicycles (E-bikes) that are propelled not only by human power but also by electric motor power. Electric bicycles, including electrically assisted bicycles that are propelled assisted by electric motors. In the following embodiments, the human-driven vehicle is described as a bicycle.

As shown in FIG. 1 , the rear hub assembly 4 includes a hub axle 8 connected to the rear end of the bicycle frame, a hub body 10 rotatably provided on the hub axle 8 , and a sprocket support 12 . The rear hub assembly 4 constitutes the center portion of the rear wheel.

The sprocket carrier 12 serves to support the sprocket arrangement 6 . The sprocket support body 12 is arranged adjacent to the hub body 10 in the axial direction DB with respect to the central axis CB of the hub shaft 8 . The sprocket support body 12 rotates relative to the hub body 10 in only one direction. When the rotation direction of the hub body 10 in which the bicycle can move forward is defined as the first rotation direction, the sprocket supporting body 12 only rotates relative to the hub body 10 in the second rotation direction opposite to the first rotation direction, and is connected The hub body 10 can integrally rotate in the first rotation direction. When the sprocket support body 12 rotates in the second rotation direction relative to the hub body 10 , the sprocket support body 12 does not transmit the rotational force to the hub body 10 . When the sprocket support body 12 rotates in the first rotation direction, that is, when it is connected to the hub body 10 , the sprocket support body 12 can transmit a rotational force to the hub body 10 .

The sprocket support 12 has a first sprocket support end 14 and a second sprocket located on the opposite side of the first sprocket support end 14 in the axial direction DB with respect to the central axis CB of the hub shaft 8 . Support body end 16 . When the sprocket support 12 is attached to the hub shaft 8 , the second sprocket support end 16 is disposed on the hub body 10 closer to the rear hub assembly 4 than the first sprocket support end 14 .

The sprocket support body 12 has a main body cylindrical portion 18 including a first sprocket support body end portion 14 and a second sprocket support body end portion 16 . An external thread portion 20 is provided on the main body cylindrical portion 18 . In the present embodiment, the external thread portion 20 is provided close to the end portion 16 of the second sprocket support body.

Referring to FIG. 2 , the sprocket configuration 6 will be described. The sprocket arrangement 6 includes a sprocket assembly 24 and an adapter 26 ; the adapter 26 is attached to the sprocket support 12 of the rear hub assembly 4 . The sprocket assembly 24 is detachably attached to the sprocket support 12 . The movement of the sprocket assembly 24 provided on the sprocket support 12 in the axial direction DA relative to the rotation center axis CA is restricted by the adapter 26 . In the mounted state where the sprocket assembly 24 is mounted on the sprocket support body 12 , the rotation center axis CA and the center axis CB are coaxial, and the axial direction DA and the axial direction DB are in the same direction.

The sprocket assembly 24 includes a plurality of sprockets 28 and a support ring 30 . The plurality of sprockets 28 are connected to each other so as to form an internal space S on the radially inner side DRA with respect to the rotation center axis CA of the sprocket assembly 24 in the mounted state where the sprocket arrangement 6 is mounted on the rear hub assembly 4, and Each has a different number of teeth.

The support ring 30 has a torque transmission portion 32 for transmitting torque to the rear hub assembly 4 and is connected to one of the sprockets 28 . The torque transmission portion 32 of the support ring 30 includes a plurality of spline grooves 34 . The torque transmission portion 32 is provided on the inner peripheral portion 40 of the support ring 30 . The connection portion 36 connected to the sprocket 28 on the support ring 30 is provided in the vicinity of the outer peripheral portion 42 of the support ring 30 .

In the present embodiment, the support ring 30 constitutes the largest sprocket 28MX having the largest diameter among the plurality of sprockets 28 . In this case, the support ring 30 is connected to the sprocket 28 having the second largest diameter among the sprockets 28 .

The plurality of sprockets 28 are integrated with each other by a single member. In one example, the integral plurality of sprockets 28 is formed by cutting a metal material. The integrated sprockets 28 can also be formed by a metal 3D printer.

In one example, the plurality of sprockets 28 include the smallest sprocket 28MN having nine teeth or less. The smallest sprocket 28MN is supported by the sub adapter 52 in the assembled state. The smallest sprocket 28MN has an opening 29 having a diameter DM2 smaller than the outer diameter DM1 of the sprocket support 12 of the rear hub assembly 4 (see FIG. 1 ).

The adapter 26 is used to fix the sprocket assembly 24 to the rear hub assembly 4 in the axial direction DA relative to the rotation center axis CA. The adapter 26 includes a main adapter 50 and a sub adapter 52 . The main adapter 50 has a first main adapter end 54 and a second main adapter end 56 located on the opposite side of the first main adapter end 54 in the axial direction DA. The second main adapter end 56 is disposed on the hub body 10 closer to the rear hub assembly 4 than the first main adapter end 54 in the mounted state.

The main adapter 50 includes an internal thread portion 58 for screwing with the external thread portion 20 of the sprocket support body 12 provided on the rear hub assembly 4 in a mounted state. The female thread portion 58 is disposed closer to the second main adapter end 56 than the first main adapter end 54 .

The main adapter 50 includes an additional threaded portion 60, which is disposed on the end portion 54 of the first main adapter and is used to be screwed to the end portion of the first auxiliary adapter on the auxiliary adapter 52. 72 provided threaded portion 76 .

In one example, the main adapter 50 includes: a main adapter barrel 62 including the second main adapter end 56, a main adapter flange 64, and a first main adapter end. 54 main adapter protrusion 66. The main adapter cylinder portion 62 surrounds the outer peripheral portion of the sprocket support body 12 . The main adapter barrel 62 has a second main adapter end 56 and a barrel end 68 on the opposite side of the second main adapter end 56 in the axial direction DA.

The main adapter flange portion 64 extends from the cylindrical portion end portion 68 of the main adapter cylindrical portion 62 toward the radially inner side DRA with respect to the rotation center axis CA. In a state where the main adapter 50 is attached to the sprocket support body 12 , the main adapter flange portion 64 is disposed adjacent to the first sprocket support body end portion 14 of the sprocket support body 12 . The inner diameter DM3 of the main adapter flange portion 64 is smaller than the outer diameter DM1 of the sprocket support body 12 (refer to FIG. 1 ).

The main adapter protrusion 66 abuts the main adapter flange 64 . The main adapter protrusion 66 extends away from the sprocket support body 12 in the axial direction DA. The main adapter protruding portion 66 is made into a cylindrical shape for the hub shaft 8 to pass through. An additional screw portion 60 is provided on the inner peripheral surface of the front end portion of the main adapter protrusion portion 66 .

The sub-adapter 52 has a first sub-adapter end 72 and a second sub-adapter end 74 located on the opposite side of the first sub-adapter end 72 in the axial direction DA. In the assembled state of the sprocket arrangement 6 , the first sub-adapter end 72 can be attached to and detached from the first main adapter end 54 of the main adapter 50 . A screw portion 76 for screwing into the additional screw portion 60 of the main adapter 50 is provided on the first sub-adapter end portion 72 .

In one example, the sub-adapter 52 includes: a cylindrical portion 78 extending from the first sub-adapter end 72 toward the second sub-adapter end 74 in the axial direction DA; The portion 74 extends toward the flange portion 80 radially outward DRB with respect to the rotation center axis CA.

The flange portion 80 has a radial outer surface 80A with respect to the rotation center axis CA and an axial outer surface 80B with respect to the rotation center axis CA. At least one tool engagement surface 82 is formed on at least one of the radially outer surface 80A and the axially outer surface 80B. The tool engaging surface 82 is used for engaging tools. As tools are, for example, an open-end wrench, a hexagonal wrench, and a ring wrench. The tool can also be a special wrench for bicycles.

The cylindrical portion 78 has a maximum outer diameter DM4 that is smaller than the outer diameter DM1 of the sprocket support body 12 of the rear hub assembly 4 (see FIG. 1 ). The sub-adapter 52 has an inner opening 84 through which the hub shaft 8 of the rear hub assembly 4 is inserted in the mounted state. The diameter DM5 (refer to FIG. 1 ) of the inner opening 84 is not less than 19.2 mm and not more than 21.3 mm.

The operation of this embodiment will be described. The sprocket arrangement 6 includes a sprocket assembly 24 and an adapter 26 ; the adapter 26 is attached to the sprocket support 12 of the rear hub assembly 4 . The adapter 26 includes a main adapter 50 and a sub adapter 52 . The sub adapter 52 has a smaller diameter than the main adapter 50 and has a structure extending in the axial direction DA with respect to the rotation center axis CA. The sub-adapter 52 is arranged so as to be in contact with the main adapter 50 in the axial direction DA, and is detachably attached to the main adapter 50 . By mounting the secondary adapter 52 to the main adapter 50 in this manner, the length of the adapter 26 is extended in this direction. Accordingly, the number of sprockets 28 that can be mounted on the adapter 26 in the axial direction DA can be increased. Furthermore, since the diameter of the sub-adapter 52 is made smaller than that of the main adapter 50, a small-diameter sprocket having a total number of teeth of 9 or less can be attached to the rear hub assembly 4, for example. Therefore, by applying the sprocket arrangement 6 of this embodiment to a bicycle, the bicycle can be shifted over a wide range.

＜Modifications＞ The description of the embodiment is an example of the form that the sprocket arrangement of the present invention can take, and is not intended to limit the form. The sprocket arrangement for a human-powered vehicle according to the present invention can take, for example, a modified example of the embodiment shown below and a combination of at least two modified examples that do not contradict each other. In the following modified examples, the same symbols as those in the embodiment are attached to the parts common to the embodiment, and description thereof is omitted.

In the above embodiment, the plurality of sprockets 28 are integrated with each other by a single member. A plurality of sprockets 28 can also be composed of a plurality of different parts. For example, as shown in FIG. 3 , a plurality of sprockets 28 may be connected to each other by a plurality of rivets 48 .

In the above embodiment, the support ring 30 is the largest sprocket 28MX among the plurality of sprockets 28 , but the form of the support ring 30 is not limited thereto. The support ring 30 may also not be the sprocket 28 .

For example, as shown in FIG. 4 , the support ring 30 may be a member connected to the largest sprocket 28MX among the plurality of sprockets 28 . In the example shown in FIG. 4 , the outer peripheral portion 42 of the support ring 30 is engaged with the inner peripheral portion of the largest sprocket 28MX so that torque can be transmitted. In another example, the support ring 30 is provided inside a predetermined sprocket 28 among the plurality of sprockets 28 in the radial direction DR with respect to the rotation center axis CA. The support ring 30 may be provided on each of several sprockets 28 selected from the plurality of sprockets 28 .

The expression "at least one" used in this manual means "more than one" of the required options. As an example, the expression "at least one" used in this specification means "only one option" or "both options" if the number of options is two. As another example, the expression "at least one" used in this specification means "only one option" or "a combination of two or more arbitrary options" if the number of options is three or more.

CA: center of rotation DR: Radial DRB: radially outer DM1: outer diameter S: inner space 4: Rear hub assembly 6: Sprocket configuration 8: hub shaft 10: hub body 12: Sprocket supporting body 20: External thread part 24: sprocket assembly 26: Adapter 28: sprocket 28MN: the smallest sprocket 29: Opening 30: support ring 32:Torque transmission part 34: spline groove 48: Rivet 50: Main adapter 52: Secondary adapter 54: 1st main adapter end 56: The end of the second main adapter 58: Internal thread part 60: additional threaded part 72: The end of the first pair of adapters 74: The end of the second pair of adapters 76: threaded part 78: Barrel 80: Flange 80A: radial outer side 80B: Axial outer side 82: Tool engagement surface 84: Internal opening

[ Fig. 1 ] is a side view of a rear hub assembly showing the relationship between the rear hub assembly and sprocket arrangement. [ Fig. 2 ] is a sectional view of a sprocket arrangement. [ Fig. 3 ] is a cross-sectional view of a first modified example of sprocket arrangement. [ Fig. 4 ] is a cross-sectional view of a second modified example of sprocket arrangement.

CA: center of rotation

CB: Central Axis

DA: axis direction

DB: axis direction

DR: Radial

DRA: radially inner

DRB: radially outer

S: inner space

6: Sprocket configuration

8: hub shaft

12: Sprocket supporting body

14: The end of the support body of the first sprocket

20: External thread part

24: sprocket assembly

26: Adapter

28: sprocket

28MN: the smallest sprocket

28MX: Maximum Sprocket

29: Opening

30: support ring

32:Torque transmission part

34: spline groove

36: Connecting part

40: Inner peripheral part

42: peripheral part

50: Main adapter

52: Secondary adapter

54: 1st main adapter end

56: The end of the second main adapter

58: Internal thread part

60: additional threaded part

62: Main adapter barrel

64: Main adapter flange

66:Main adapter protrusion

68:Cylinder end

72: The end of the first pair of adapters

74: The end of the second pair of adapters

76: threaded part

78: Barrel

80: Flange

80A: radial outer side

80B: Axial outer side

82: Tool engagement surface

84: Inner opening

Claims (13)

A sprocket configuration is a sprocket configuration mounted on a rear wheel hub assembly for a human-driven vehicle, The above sprocket configuration includes: a sprocket assembly, and an adapter; The above-mentioned adapter is installed on the sprocket supporting body of the above-mentioned rear wheel hub assembly; The sprocket assembly includes: a plurality of sprockets and support rings; The above-mentioned plurality of sprockets are connected to each other to form an internal space radially inward with respect to the rotation center axis of the above-mentioned sprocket assembly in the installed state where the above-mentioned sprockets are arranged and installed on the above-mentioned rear hub assembly, and each has a different shape. number of teeth; The support ring has a torque transmission portion for transmitting torque to the rear hub assembly, and is connected to one of the plurality of sprockets; The above-mentioned adapter is used to fix the above-mentioned sprocket assembly to the above-mentioned rear wheel hub assembly in the axial direction relative to the above-mentioned rotation center axis; The above-mentioned adapter has a main adapter and a sub-adapter; The above-mentioned main adapter has: a first main adapter end, and a second main adapter end on the opposite side of the first main adapter end in the axial direction; The end of the second main adapter is disposed on the hub body of the rear hub assembly closer to the end of the first main adapter in the installed state; The above-mentioned sub-adapter has: a first sub-adapter end, and a second sub-adapter end on the opposite side of the first sub-adapter in the axial direction; In the assembled state of the sprocket arrangement, the end portion of the first sub-adapter can be attached to and detached from the end portion of the first main adapter of the main adapter. The sprocket arrangement according to claim 1, wherein the plurality of sprockets are integrated with each other by a single member. The sprocket configuration as in claim 1, wherein the plurality of sprockets are connected to each other by a plurality of rivets. Such as the sprocket configuration of claim item 1, wherein the above-mentioned plural sprockets include the smallest sprocket with the number of teeth less than 9, The above-mentioned smallest sprocket is supported by the above-mentioned sub-adapter in the above-mentioned assembled state. The sprocket configuration according to claim 4, wherein the smallest sprocket has an opening, The diameter of the opening is smaller than the outer diameter of the sprocket support of the rear hub assembly. Such as the sprocket configuration of request item 1, wherein the above-mentioned sub-adapter includes: a cylindrical portion extending from the end of the first sub-adapter toward the end of the second sub-adapter in the axial direction, and a flange portion extending radially outward with respect to the axis of the rotation center from the end portion of the second sub-adapter. The sprocket arrangement according to claim 6, wherein the flange portion has: a radially outer surface relative to the axis of the rotation center, and an axially outer surface relative to the axis of the rotation center; At least one tool engagement surface is formed on at least one of the radially outer surface and the axially outer surface. The sprocket arrangement according to claim 6, wherein the cylindrical portion has a maximum outer diameter smaller than the outer diameter of the sprocket support body of the rear hub assembly. Such as the sprocket configuration of claim item 1, wherein the above-mentioned main adapter includes an internal thread part, The internal thread portion is used to be screwed to the external thread portion provided on the sprocket support body of the rear hub assembly in the mounted state. The sprocket configuration according to claim 9, wherein the internal thread portion is disposed closer to the end of the second main adapter than the end of the first main adapter. The sprocket configuration of claim 1, wherein the above-mentioned main adapter includes an additional threaded portion, The additional threaded portion is provided at the end of the first main adapter, and is used to be screwed to the threaded portion provided at the end of the first auxiliary adapter of the auxiliary adapter. The sprocket configuration as claimed in claim 1, wherein the sub-adapter has an internal opening, The inner opening is used for inserting the hub axle of the rear hub assembly in the installed state, The diameter of the said internal opening part is 19.2 mm or more and 21.3 mm or less. The sprocket configuration according to claim 1, wherein the torque transmission portion of the support ring includes a plurality of spline grooves.

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