TWI707801B - Bicycle rear sprocket assembly - Google Patents

Abstract

A bicycle rear sprocket assembly comprises at least one sprocket having a total tooth number that is equal to or larger than 15. The at least one sprocket includes at least ten internal spline teeth configured to engage with a bicycle hub assembly.

Description

Bicycle rear sprocket assembly

The invention relates to a bicycle rear sprocket assembly.

Cycling is becoming an increasingly popular form of pastime and 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 fully redesigned is the transmission system.

According to a first aspect of the present invention, a bicycle rear sprocket assembly includes at least one sprocket having a total number of teeth equal to or greater than 15 teeth. The at least one sprocket includes at least ten internal spline teeth that are configured to mesh with a bicycle hub assembly.

In the case of the bicycle rear sprocket assembly according to the first aspect, compared to a sprocket including nine or fewer internal spline teeth, at least ten internal spline teeth are less applied to at least ten internal spline teeth The rotational force of each of the teeth. This improves the durability of the at least one sprocket and/or improves the degree of freedom in selecting the material of the at least one sprocket without reducing the durability of the at least one sprocket.

According to the second aspect of the present invention, the bicycle rear sprocket assembly as in the first aspect is configured such that the total number of one of the at least ten internal spline teeth is equal to or greater than 20.

In the case of the bicycle rear sprocket assembly according to the second aspect, compared to including nine or The sprocket with fewer internal spline teeth supports the body, and at least twenty internal spline teeth reduce the rotational force applied to each of the at least twenty internal spline teeth. This improves the durability of the at least one sprocket and/or improves the degree of freedom in selecting the material of the at least one sprocket without reducing the durability of the at least one sprocket.

According to a third aspect of the present invention, the bicycle rear sprocket assembly as in the second aspect is configured such that the total number of the at least ten internal spline teeth is equal to or greater than 25.

In the case of the bicycle rear sprocket assembly according to the third aspect, compared to a sprocket including nine or less internal spline teeth, at least twenty-five internal spline teeth are further reduced to at least twenty The rotational force of each of the five internal spline teeth. This further improves the durability of the at least one sprocket and/or improves the freedom of selecting the material of the at least one sprocket without reducing the durability of the at least one sprocket.

According to a fourth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the third aspect is configured such that the at least ten internal spline teeth have a first internal circumferential section Angle and a second inner circumferential pitch angle different from the first inner circumferential pitch angle.

In the case of the bicycle rear sprocket assembly according to the fourth aspect, the difference between the first inner pitch angle and the second inner pitch angle helps the user to correctly install the bicycle rear sprocket assembly to the bicycle hub Assembly, especially the circumferential position of each sprocket of the bicycle rear sprocket assembly.

According to a fifth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the fourth aspect is configured such that the at least one sprocket includes at least ten sprockets.

In the case of the bicycle rear sprocket assembly according to the fifth aspect, at least ten sprockets realize the wide range of the bicycle rear sprocket.

According to a sixth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the fourth aspect is configured such that the at least one sprocket includes at least eleven sprocket wheels.

In the case of the bicycle rear sprocket assembly according to the sixth aspect, at least eleven sprockets realize a wider range of the bicycle rear sprocket.

According to a seventh aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the fourth aspect is configured such that the at least one sprocket includes at least twelve sprockets.

In the case of the bicycle rear sprocket assembly according to the seventh aspect, at least twelve sprockets realize a wider range of the bicycle rear sprocket.

According to an eighth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the seventh aspect is configured such that the at least one sprocket includes a plurality of sprockets and is configured to At least one internal spline tooth meshed with a bicycle hub assembly. The plurality of sprockets includes one of the largest sprockets having a tooth tip diameter. The at least one internal spline tooth has an internal spline top diameter. The ratio of the inner spline tip diameter to the tooth tip diameter is in the range of 0.1 to 0.2.

In the case of the bicycle rear sprocket assembly according to the eighth aspect, the ratio realizes a wide range of the bicycle rear sprocket assembly while improving the durability of at least one sprocket.

According to a ninth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the eighth aspect is configured such that the at least one sprocket includes a first sprocket and a second sprocket Sprocket. The first sprocket has a first total number of teeth. The second sprocket has a second total number of teeth which is less than the first total number of teeth. The first sprocket includes at least one first displacement promotion area to promote a first displacement operation of a bicycle chain from the second sprocket to the first sprocket, and includes at least one second displacement promotion Area to facilitate a second displacement operation of the bicycle chain from the first sprocket to the second sprocket.

In the case of the bicycle rear sprocket assembly according to the ninth aspect, at least one first displacement promotion area and at least one second displacement promotion area make the first displacement operation and the second displacement operation smoother.

According to a tenth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the ninth aspect further includes a locking member configured to prevent installation on a bicycle hub assembly The completed at least one sprocket moves in an axial direction relative to a rotation center axis of the bicycle rear sprocket assembly. The locking member includes a tubular body part and a protruding part. The tubular body part has a central axis. The protruding part extends radially outward from the tubular body part with respect to the central axis of the tubular body part. The tubular body portion has an outer threaded portion configured to engage with an inner threaded portion of the bicycle hub assembly. The protrusion is configured to abut the at least one sprocket.

In the case of the bicycle rear sprocket assembly according to the tenth aspect, it is possible to attach the bicycle rear sprocket assembly to the bicycle hub assembly to prevent at least one sprocket from axially moving relative to the bicycle hub assembly.

According to an eleventh aspect of the present invention, the bicycle rear sprocket assembly as in the tenth aspect is configured such that the tubular body portion has a first outer diameter equal to or less than 26 mm.

In the case of the bicycle rear sprocket assembly according to the eleventh aspect, the first outer diameter realizes a wide range of the bicycle rear sprocket assembly while preventing the axial movement of at least one sprocket relative to the bicycle hub assembly.

According to the twelfth aspect of the present invention, the bicycle rear sprocket assembly as in the eleventh aspect is configured such that the first outer diameter is equal to or greater than 25 mm.

In the case of the bicycle rear sprocket assembly according to the twelfth aspect, the first outer diameter ensures the strength of the locking member while realizing the wide range of the bicycle rear sprocket assembly.

According to the thirteenth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the tenth aspect to the twelfth aspect is configured such that the protruding portion has a second outer portion equal to or less than 32mm path.

In the case of the bicycle rear sprocket assembly according to the thirteenth aspect, the second outer diameter realizes a wide range of the bicycle rear sprocket assembly while preventing at least one sprocket from axially moving relative to the bicycle hub assembly.

According to the fourteenth aspect of the present invention, the bicycle rear sprocket assembly as in the thirteenth aspect is configured such that the second outer diameter is equal to or greater than 30 mm.

In the case of the bicycle rear sprocket assembly according to the fourteenth aspect, the second outer diameter ensures the strength of the locking member while realizing the wide range of the bicycle rear sprocket assembly.

According to the fifteenth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the tenth aspect to the fourteenth aspect is configured such that the locking member has a tool engagement portion.

In the case of the bicycle rear sprocket assembly according to the fifteenth aspect, it is possible to easily attach the locking member to the bicycle hub assembly and easily detach the locking member from the bicycle hub assembly.

According to the sixteenth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the fifteenth aspect further includes a sprocket support. The at least one sprocket includes a plurality of sprockets attached to the sprocket support.

In the case of the bicycle rear sprocket assembly according to the sixteenth aspect, it is possible to reduce the weight of the bicycle rear sprocket assembly.

According to a seventeenth aspect of the present invention, the bicycle rear sprocket assembly as in the sixteenth aspect is configured such that the plurality of sprockets are attached to the sprocket support by an adhesive.

In the case of the bicycle rear sprocket assembly according to the seventeenth aspect, it is possible to reduce or remove metal fasteners. This effectively reduces the weight of the rear sprocket assembly of the bicycle.

According to the eighteenth aspect of the present invention, the bicycle rear sprocket assembly such as the sixteenth aspect or the seventeenth aspect is configured such that the sprocket support is made of a non-metallic material including a resin material to make.

In the case of the bicycle rear sprocket assembly according to the eighteenth aspect, non-metallic materials can effectively reduce the weight of the bicycle rear sprocket assembly.

According to a nineteenth aspect of the present invention, the bicycle rear sprocket assembly of any one of the first to eighteenth aspects further includes a rear hub abutting surface, the rear hub abutting surface is configured to The bicycle rear sprocket assembly is installed to a bicycle hub assembly in a state in which it abuts the bicycle hub assembly in an axial direction relative to a rotation center axis of the bicycle rear sprocket assembly. The at least one sprocket includes a plurality of sprockets, and the plurality of sprockets includes a largest sprocket. The largest sprocket has an axial inner surface and an axial outer surface disposed on a reverse side of the axial inner surface in the axial direction. Compared to the axial inner surface, the axial outer surface is closer to the rear hub abutment surface in the axial direction. An axial distance defined between the axial inner surface and the abutting surface of the rear hub in the axial direction is equal to or greater than 7 mm.

In the case of the bicycle rear sprocket assembly according to the nineteenth aspect, the axial distance realizes a wide range of the bicycle rear sprocket.

According to the twentieth aspect of the present invention, the bicycle rear sprocket assembly as in the nineteenth aspect is configured such that the axial distance is equal to or greater than 10 mm.

In the case of the bicycle rear sprocket assembly according to the twentieth aspect, the axial distance further realizes a wider range of the bicycle rear sprocket.

According to the twenty-first aspect of the present invention, a bicycle rear sprocket assembly includes at least one sprocket, and the at least one sprocket has a total number of teeth equal to or greater than 15. The at least one sprocket includes at least one internal spline tooth that is configured to mesh with a bicycle hub assembly. The at least one internal spline tooth has an internal spline tip diameter equal to or less than 30 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-first aspect, it is possible to manufacture a bicycle rear sprocket with a total number of teeth of 10 or less. Therefore, it is possible to widen the freewheel on the high-speed gear side Gear range of the sprocket assembly after driving. The twenty-first aspect can be combined with any one of the first aspect to the twentieth aspect.

According to the twenty-second aspect of the present invention, the bicycle rear sprocket assembly of the twenty-first aspect is configured such that the top diameter of the internal spline is equal to or greater than 25 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-second aspect, it is possible to ensure the strength of at least one sprocket while widening the gear range of the bicycle rear sprocket assembly on the high-speed gear side.

According to the twenty-third aspect of the present invention, the bicycle rear sprocket assembly as in the twenty-first aspect is configured such that the top diameter of the inner spline is equal to or greater than 29 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-third aspect, it is possible to further ensure the strength of at least one sprocket, while widening the gear range of the bicycle rear sprocket assembly on the high-speed gear side.

According to the twenty-fourth aspect of the present invention, the bicycle rear sprocket assembly of any one of the twenty-first aspect to the twenty-third aspect is configured such that the at least one internal spline tooth has Or one of the inner spline bottom diameter less than 28mm.

In the case of the bicycle rear sprocket assembly according to the twenty-fourth aspect, the bottom diameter of the inner spline can increase the radial length of the transmission surface of at least one inner spline tooth. This improves the strength of at least one sprocket.

According to the twenty-fifth aspect of the present invention, the bicycle rear sprocket assembly as in the twenty-fourth aspect is configured such that the inner spline bottom diameter is equal to or greater than 25 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-fifth aspect, it is possible to ensure the strength of at least one sprocket while widening the gear range of the bicycle rear sprocket assembly on the high-speed gear side.

According to the twenty-sixth aspect of the present invention, the bicycle rear sprocket assembly such as the twenty-fourth aspect or the twenty-fifth aspect is configured such that the inner spline bottom diameter is equal to or greater than 27 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-sixth aspect, it is possible to surely ensure the strength of at least one sprocket while widening the gear range of the bicycle rear sprocket assembly on the high-speed gear side.

According to the twenty-seventh aspect of the present invention, the bicycle rear sprocket assembly of any one of the twenty-first aspect to the twenty-sixth aspect is configured such that the at least one internal spline tooth includes a plurality of Internal spline teeth, the plurality of internal spline teeth include a plurality of internal spline transmission surfaces for transmitting a transmission rotational force to the bicycle hub assembly during pedaling. Each of the plurality of inner spline transmission surfaces includes a radially outermost edge, a radially innermost edge, and a radial length defined from the radially outermost edge to the radially innermost edge. The sum of one of the radial lengths is equal to or greater than 7 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-seventh aspect, it is possible to increase the radial length of the plurality of internal spline transmission surfaces. This improves the strength of at least one sprocket.

According to the twenty-eighth aspect of the present invention, the bicycle rear sprocket assembly as in the twenty-seventh aspect is configured such that the sum of the radial lengths is equal to or greater than 10 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-eighth aspect, it is possible to further increase the radial length of the plurality of internal spline transmission surfaces. This improves the strength of at least one sprocket.

According to the twenty-ninth aspect of the present invention, the bicycle rear sprocket assembly as in the twenty-seventh aspect is configured such that the sum of the radial lengths is equal to or greater than 15 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-ninth aspect, it is possible to further increase the radial length of the plurality of external spline transmission surfaces. This further improves the strength of at least one sprocket.

According to the thirtieth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the twenty-first aspect to the twenty-ninth aspect is configured such that the at least one sprocket includes at least ten chains wheel.

In the case of the bicycle rear sprocket assembly according to the thirtieth aspect, at least ten sprockets realize the wide range of the bicycle rear sprocket assembly.

According to the thirty-first aspect of the present invention, the bicycle rear sprocket assembly, such as any one of the twenty-first aspect to the twenty-ninth aspect, is configured such that the at least one sprocket includes at least eleven Sprocket.

In the case of the bicycle rear sprocket assembly according to the thirty-first aspect, at least eleven sprockets realize the wide range of the bicycle rear sprocket assembly.

According to the thirty-second aspect of the present invention, the bicycle rear sprocket assembly as in any one of the twenty-first aspect to the twenty-ninth aspect is configured such that the at least one sprocket includes at least twelve Sprocket.

In the case of the bicycle rear sprocket assembly according to the thirty-second aspect, at least twelve sprockets realize the wide range of the bicycle rear sprocket assembly.

According to the thirty-third aspect of the present invention, the bicycle rear sprocket assembly as in any one of the twenty-first aspect to the thirty-second aspect is configured such that the at least one sprocket includes a plurality of chains wheel. The plurality of sprockets includes one of the largest sprockets having a tooth tip diameter. The ratio of the main diameter of the internal spline to the diameter of the tooth tip is in the range of 0.1 to 0.2.

In the case of the bicycle rear sprocket assembly according to the thirty-third aspect, the ratio realizes a wide range of the bicycle rear sprocket assembly while improving the durability of at least one sprocket.

According to the thirty-fourth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the twenty-first aspect to the thirty-second aspect is configured such that the at least one sprocket includes a first Sprocket and a second sprocket. The first sprocket has a first total number of teeth. The second sprocket has a smaller One of the total number of teeth, the second total number of teeth. The first sprocket includes at least one first displacement promotion area to promote a first displacement operation of a bicycle chain from the second sprocket to the first sprocket, and includes at least one second displacement promotion Area to facilitate a second displacement operation of the bicycle chain from the first sprocket to the second sprocket.

In the case of the bicycle rear sprocket assembly according to the thirty-fourth aspect, at least one first displacement promotion area and at least one second displacement promotion area make the first displacement operation and the second displacement operation smoother .

According to the thirty-fifth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the twenty-first aspect to the thirty-fourth aspect further includes a locking member configured to prevent The at least one sprocket mounted on a bicycle hub assembly moves in an axial direction relative to a rotation center axis of the bicycle rear sprocket assembly. The locking member includes a tubular body part and a protruding part. The tubular body part has a central axis. The protruding part extends radially outward from the tubular body part with respect to the central axis of the tubular body part. The tubular body portion has an outer threaded portion configured to engage with an inner threaded portion of the bicycle hub assembly. The protrusion is configured to abut the at least one sprocket.

In the case of the bicycle rear sprocket assembly according to the thirty-fifth aspect, it is possible to attach the bicycle rear sprocket assembly to the bicycle hub assembly to prevent at least one sprocket from axially moving relative to the bicycle hub assembly .

According to the thirty-sixth aspect of the present invention, the bicycle rear sprocket assembly as in the thirty-fifth aspect is configured such that the tubular body portion has a first outer diameter equal to or less than 26 mm.

In the case of the bicycle rear sprocket assembly according to the thirty-sixth aspect, the first outer diameter realizes the wide range of the bicycle rear sprocket assembly while preventing the axial movement of at least one sprocket relative to the bicycle hub assembly .

According to the thirty-seventh aspect of the present invention, the bicycle rear sprocket assembly as in the thirty-sixth aspect is configured such that the first outer diameter is equal to or greater than 25 mm.

In the case of the bicycle rear sprocket assembly according to the thirty-seventh aspect, the first outer diameter ensures the strength of the locking member while realizing the wide range of the bicycle rear sprocket assembly.

According to the thirty-eighth aspect of the present invention, the bicycle rear sprocket assembly of any one of the thirty-fifth aspect to the thirty-seventh aspect is configured such that the protruding portion has a size equal to or less than 32 mm A second outer diameter.

In the case of the bicycle rear sprocket assembly according to the thirty-eighth aspect, the second outer diameter realizes a wide range of the bicycle rear sprocket assembly while preventing at least one sprocket from axially moving relative to the bicycle hub assembly.

According to the thirty-ninth aspect of the present invention, the bicycle rear sprocket assembly as in the thirty-eighth aspect is configured such that the second outer diameter is equal to or greater than 30 mm.

In the case of the bicycle rear sprocket assembly according to the thirty-ninth aspect, the second outer diameter ensures the strength of the locking member while realizing the wide range of the bicycle rear sprocket assembly.

According to the fortieth aspect of the present invention, the bicycle rear sprocket assembly of any one of the thirty-fifth aspect to the thirty-ninth aspect is configured such that the locking member has a tool engagement portion.

In the case of the bicycle rear sprocket assembly according to the fortieth aspect, it is possible to easily attach the locking member to the bicycle hub assembly and easily detach the locking member from the bicycle hub assembly.

According to the 41st aspect of the present invention, the bicycle rear sprocket assembly as in any one of the 21st aspect to the 40th aspect further includes a sprocket support. The at least one sprocket includes a plurality of sprockets attached to the sprocket support.

In the case of the bicycle rear sprocket assembly according to the 41st aspect, it is possible to reduce the weight of the bicycle rear sprocket assembly.

According to the forty-second aspect of the present invention, the bicycle rear sprocket assembly as in the forty-first aspect is configured such that the plurality of sprockets are attached to the sprocket support by an adhesive.

In the case of the bicycle rear sprocket assembly according to the forty-second aspect, it is possible to reduce or eliminate metal fasteners. This effectively reduces the weight of the rear sprocket assembly of the bicycle.

According to the forty-third aspect of the present invention, the bicycle rear sprocket assembly such as the forty-first aspect or the forty-second aspect is configured such that the sprocket support is made of a non-metallic material including a resin material. Made of metal materials.

In the case of the bicycle rear sprocket assembly according to the forty-third aspect, non-metallic materials can effectively reduce the weight of the bicycle rear sprocket assembly.

According to the forty-fourth aspect of the present invention, the bicycle rear sprocket assembly of any one of the twenty-first aspect to the forty-third aspect further includes a rear hub abutting surface, and the rear hub abutting surface is It is configured to abut the bicycle hub assembly in an axial direction relative to a rotation center axis of the bicycle rear sprocket assembly in a state where the bicycle rear sprocket assembly is mounted to a bicycle hub assembly. The at least one sprocket includes a plurality of sprockets, and the plurality of sprockets includes a largest sprocket. The largest sprocket has an axial inner surface and an axial outer surface disposed on a reverse side of the axial inner surface in the axial direction. Compared to the axial inner surface, the axial outer surface is closer to the rear hub abutment surface in the axial direction. An axial distance defined between the axial inner surface and the abutting surface of the rear hub in the axial direction is equal to or greater than 7 mm.

In the case of the bicycle rear sprocket assembly according to the forty-fourth aspect, the axial distance realizes a wide range of the bicycle rear sprocket.

According to the forty-fifth aspect of the present invention, the bicycle rear sprocket assembly of the forty-fourth aspect is configured such that the axial distance is equal to or greater than 10 mm.

In the case of the bicycle rear sprocket assembly according to the forty-fifth aspect, the axial distance is increased by one Step to achieve a wider range of bicycle rear sprocket.

According to the forty-sixth aspect of the present invention, a bicycle rear sprocket assembly includes a plurality of sprockets, a rear hub abutting surface and an axial distance. The plurality of sprockets includes a largest sprocket. The largest sprocket has an axial inner surface and an axial outer surface disposed on an opposite side of the axial inner surface in an axial direction relative to a rotation center axis of the bicycle rear sprocket assembly surface. The rear hub abutting surface is configured to abut the bicycle hub assembly in the axial direction in a state where the bicycle rear sprocket assembly is mounted to a bicycle hub assembly, compared to the axial inner surface, The axial outer surface is closer to the rear hub abutment surface in the axial direction. The axial distance defined between the axial inner surface and the rear hub abutting surface in the axial direction is equal to or greater than 7 mm.

In the case of the bicycle rear sprocket assembly according to the 46th aspect, the axial distance realizes a wide range of the bicycle rear sprocket.

According to the forty-seventh aspect of the present invention, the bicycle rear sprocket assembly of the forty-sixth aspect is configured such that the axial distance is equal to or greater than 10 mm.

In the case of the bicycle rear sprocket assembly according to the 47th aspect, the axial distance further realizes a wider range of the bicycle rear sprocket.

According to the forty-eighth aspect of the present invention, the bicycle rear sprocket assembly of the forty-sixth aspect or the forty-seventh aspect is configured so that the rear sprocket assembly of the bicycle is mounted to the bicycle hub In a state of the assembly, the axial inner surface is positioned closer to an axial center plane of the bicycle hub assembly than the abutting surface of the rear hub.

In the case of the bicycle rear sprocket assembly according to the forty-eighth aspect, the axial distance realizes a wider range of the bicycle rear sprocket.

According to the forty-ninth aspect of the present invention, such as any of the forty-sixth aspect to the forty-eighth aspect The one-piece bicycle rear sprocket assembly is configured such that the total number of one of the plurality of sprockets is 12.

In the case of the bicycle rear sprocket assembly according to the forty-ninth aspect, the total number of the plurality of sprockets realizes the wide range of the bicycle rear sprocket.

According to the fiftieth aspect of the present invention, the bicycle rear sprocket assembly of any one of the forty-sixth aspect to the forty-ninth aspect is configured such that the total number of teeth of the largest sprocket is equal to or Greater than 39.

In the case of the bicycle rear sprocket assembly according to the fiftieth aspect, the total number of teeth of the largest sprocket realizes the wide range of the bicycle rear sprocket.

According to the fifty-first aspect of the present invention, the bicycle rear sprocket assembly of any one of the forty-sixth aspect to the forty-ninth aspect is configured such that the total number of teeth of the largest sprocket is equal to Or greater than 45.

In the case of the bicycle rear sprocket assembly according to the fifty-first aspect, the total number of teeth of the largest sprocket realizes a wider range of the bicycle rear sprocket.

10: Bicycle transmission system

12: Bicycle wheel assembly

14: Bicycle rear sprocket assembly

16: Bicycle brake rotor

18: crank assembly

20: Bicycle chain

22: crankshaft

24: Right crank arm

26: Left crank arm

27: front sprocket

28: Sprocket support body

28A: Internal threaded part

30: Hub axle

30A: Through hole

30B: First shaft end

30B1: Axial contact surface

30C: second shaft end

32: Locking member

32A: External threaded part

32B: Protruding part

32C: Tubular body part

32C1: inner peripheral surface

32D: Tool engagement part

32D1: Tool engagement groove

34: Brake rotor support body

36: Hub body

36A: First flange

36B: second flange

38: Ratchet structure / one-way coupling structure

39A: First bearing

39B: second bearing

40: External spline tooth

40A: radial outermost end

40G: groove

41: Base support

42: Larger diameter part

42A: Axial end

44: flange

46: Spiral external spline tooth

48: External spline transmission surface

48A: radial outermost edge

48B: radial innermost edge

50: External spline non-transmission surface

50A: radial outermost edge

50B: radial innermost edge

50R: reference point

52: Extra external spline tooth

54: Additional base support

56: sprocket support

58: Spacer

58A: First spacer

58B: second spacer

58C: Third spacer

58D: Fourth spacer

58E: Fifth spacer

58F: Sixth spacer

58G: Seventh spacer

59A: First ring

59B: Second Ring

60: Wheel hub engagement part

62: Support arm

62A: The first attachment part

62B: second attachment part

62C: Third attachment part

62D: Fourth attachment part

62E: Fifth attachment part

62F: sixth attachment part

62G: seventh attachment part

62H: Eighth attachment part

64: Internal spline tooth

64A: radial innermost end

64G: groove

66: Internal spline transmission surface

66A: radial outermost edge

66B: radial innermost edge

68: Internal spline non-transmission surface

68A: radial outermost edge

68B: radial innermost edge

68R: reference point

70: Internal spline tooth

72: Internal spline tooth

74: Internal spline tooth

76: Internal spline tooth

78: Internal spline tooth

80: Rear wheel hub abutment surface

214: Bicycle rear sprocket assembly

A1: Rotation center axis

A2: Central axis

AD1: Axial distance

AG11: Surface angle of the first external spline

AG12: second external spline surface angle

AG21: First inner spline surface angle

AG22: second inner spline surface angle

AL11: first axial length

AL12: second axial length

AL13: axial length

BF: Bicycle frame

BF1: The first frame

BF2: The second frame

BF11: The first groove

BF12: Frame contact surface

BF21: second groove

CL1: Centerline of circumferential tooth tip

CL2: Centerline of circumferential tooth tip

CP1: Circle center point

CP2: Circle center point

CPL: axial center plane

D1: circumferential direction

D2: axial direction

D11: Transmission rotation direction

D12: Reverse rotation direction

DM11: Top diameter of external spline

DM12: bottom diameter of external spline

DM13: Outer diameter

DM14: Additional external spline top diameter

DM21: Top diameter of internal spline

DM22: bottom diameter of internal spline

ED1: First outer diameter

ED2: second outer diameter

F1: Transmission rotation force

F2: thrust

F3: thrust

IV-IV: Line

L11: First radial line

L12: Second radial line

L21: First radial line

L22: Second radial

MW1: Maximum width of circumference

MW2: Maximum width of circumference

PA11: The first outer peripheral corner

PA12: Second outer circumferential corner

PA21: The first inner corner

PA22: The second inner circumferential corner

RC11: The first reference circle

RC12: External spline tooth root circle

RC21: Second reference circle

RC22: Internal spline tooth root circle

RL11: Radial length

RL12: Radial length

RL21: Radial length

RL22: Extra radial length

SP1: Sprocket

SP1A: Sprocket body

SP1B: Sprocket

SP2: Sprocket

SP2A: Sprocket body

SP2B: Sprocket

SP3: Sprocket

SP3A: Sprocket body

SP3B: Sprocket

SP4: Sprocket

SP4A: Sprocket body

SP4B: Sprocket

SP5: Sprocket

SP5A: Sprocket body

SP5B: Sprocket

SP6: Sprocket

SP6A: Sprocket body

SP6B: Sprocket

SP7: Sprocket

SP7A: Sprocket body

SP7B: Sprocket

SP8: Sprocket

SP8A: Sprocket body

SP8B: Sprocket

SP9: Sprocket

SP9A: Sprocket body

SP9B: Sprocket

SP10: Sprocket

SP10A: Sprocket body

SP10B: Sprocket

SP11: Sprocket

SP11A: Sprocket body

SP11B: Sprocket

SP12: Sprocket

SP12A: Sprocket body

SP12B: Sprocket

SP12C: axial inner surface

SP12D: Axial outer surface

SP202: Sprocket

SP203: Sprocket

SP204: Sprocket

SP205: Sprocket

SP206: Sprocket

SP207: Sprocket

SP208: Sprocket

SP209: Sprocket

SP210: Sprocket

SP211: Sprocket

SP212: Sprocket

SP212B1: Displacement promoting tooth

SP212B2: displacement promoting tooth

SP212B3: displacement promoting tooth

SP212R1: promote groove

SP212R2: promote groove

SP212R3: Promote groove

SP212X: The first shift promotion area

SP212X1: First displacement promotion groove

SP212Y: Second shift promotion area

SP212Y1: The second displacement promotion groove

TD1: Tooth tip diameter

WS: Wheel fastening structure

WS1: Fastening rod

XVI-XVI: line

XXIII-XXIII: line

When considered in conjunction with the accompanying drawings, with reference to the following detailed description, a more complete evaluation of the present invention and its many accompanying advantages will be easily obtained, and will also become better understood, in which: FIG. 1 is a schematic diagram of a bicycle transmission system according to an embodiment.

Fig. 2 is an exploded perspective view of the bicycle transmission system illustrated in Fig. 1.

Fig. 3 is another perspective view of the bicycle transmission system illustrated in Fig. 2.

4 is a cross-sectional view of the bicycle transmission system taken along the line IV-IV of FIG. 2.

Fig. 5 is an exploded perspective view of the bicycle hub assembly of the bicycle transmission system illustrated in Fig. 2.

Fig. 6 is an enlarged cross-sectional view of the bicycle transmission system illustrated in Fig. 4.

7 is a perspective view of the sprocket supporting body of the bicycle hub assembly of the bicycle transmission system illustrated in FIG. 2.

8 is another perspective view of the sprocket supporting body of the bicycle hub assembly of the bicycle transmission system illustrated in FIG. 2.

Fig. 9 is a side view of the sprocket supporting body illustrated in Fig. 7.

Fig. 10 is a side view of the sprocket supporting body of the bicycle hub assembly according to the modification.

Fig. 11 is an enlarged cross-sectional view of the sprocket supporting body illustrated in Fig. 7.

Fig. 12 is a cross-sectional view of the sprocket supporting body illustrated in Fig. 7.

Fig. 13 is a perspective view of the bicycle hub assembly of the bicycle transmission system illustrated in Fig. 2.

Fig. 14 is a side view of the bicycle hub assembly of the bicycle transmission system illustrated in Fig. 2.

Fig. 15 is a rear view of the bicycle hub assembly of the bicycle transmission system illustrated in Fig. 2.

Figure 16 is a cross-sectional view of the bicycle hub assembly taken along the line XVI-XVI of Figure 5;

Fig. 17 is a side view of the bicycle rear sprocket assembly of the bicycle transmission system illustrated in Fig. 2.

Figure 18 is an exploded perspective view of the bicycle rear sprocket assembly illustrated in Figure 17;

Fig. 19 is a partially exploded perspective view of the bicycle rear sprocket assembly illustrated in Fig. 17.

20 is another partial exploded perspective view of the bicycle rear sprocket assembly illustrated in FIG. 17.

Fig. 21 is an exploded perspective view of another part of the bicycle rear sprocket assembly illustrated in Fig. 17.

22 is another partial exploded perspective view of the bicycle rear sprocket assembly illustrated in FIG. 17.

Figure 23 is a perspective cross-sectional view of the bicycle rear sprocket assembly taken along the line XXIII-XXIII of Figure 17;

Figure 24 is a perspective view of the smallest sprocket of the bicycle rear sprocket assembly illustrated in Figure 17;

Figure 25 is another perspective of the smallest sprocket of the bicycle rear sprocket assembly illustrated in Figure 17 Figure.

Fig. 26 is a side view of the smallest sprocket of the bicycle rear sprocket assembly illustrated in Fig. 17.

Figure 27 is a side view of the smallest sprocket according to the modification.

Fig. 28 is an enlarged cross-sectional view of the smallest sprocket illustrated in Fig. 24.

Figure 29 is a cross-sectional view of the smallest sprocket illustrated in Figure 24.

30 is a cross-sectional view of the sprocket supporting body and the smallest sprocket of the bicycle transmission system illustrated in FIG. 2.

Figure 31 is a partially exploded perspective view of the bicycle rear sprocket assembly illustrated in Figure 17;

Figure 32 is a perspective view of the sprocket support of the bicycle rear sprocket assembly illustrated in Figure 17;

Figure 33 is a side view of the rear sprocket assembly of a bicycle according to the modification.

Figure 34 is a side view of the first sprocket of the bicycle rear sprocket assembly illustrated in Figure 33.

35 is a partial perspective view of the first sprocket of the bicycle rear sprocket assembly illustrated in FIG. 33.

Fig. 36 is another side view of the first sprocket of the bicycle rear sprocket assembly illustrated in Fig. 33.

Fig. 37 is another partial perspective view of the first sprocket of the bicycle rear sprocket assembly illustrated in Fig. 33;

Figure 38 is an enlarged cross-sectional view of the sprocket supporting body according to the modification.

Figure 39 is an enlarged cross-sectional view of the smallest sprocket according to the modification.

This application is a partial continuation application of U.S. Patent Application No. 15/608,924 filed on May 30, 2017. The content of the application is incorporated herein by reference in its entirety.

The embodiments will now be described with reference to the drawings, in which similar reference numerals are designated among the various drawings Corresponding or identical components.

First, referring to FIG. 1, a bicycle transmission system 10 according to an embodiment includes a bicycle hub assembly 12 and a bicycle rear sprocket assembly 14. The bicycle hub assembly 12 is fastened to the bicycle frame BF. The bicycle rear sprocket assembly 14 is mounted on the bicycle hub assembly 12. The bicycle brake rotor 16 is mounted on the bicycle hub assembly 12.

The bicycle transmission system 10 further includes a crank assembly 18 and a bicycle chain 20. The crank assembly 18 includes a crank shaft 22, a right crank arm 24, a left crank arm 26 and a front sprocket 27. The right crank arm 24 and the left crank arm 26 are fastened to the crank shaft 22. The front sprocket 27 is fastened to at least one of the crankshaft 22 and the right crank arm 24. The bicycle chain 20 meshes with the front sprocket 27 and the bicycle rear sprocket assembly 14 to transmit the pedaling force from the front sprocket 27 to the bicycle rear sprocket assembly 14. The crank assembly 18 includes a front sprocket 27 as the single sprocket in the illustrated embodiment. However, the crank assembly 18 may include a plurality of front sprockets. The bicycle rear sprocket assembly 14 is a rear sprocket assembly. However, the structure of the bicycle rear sprocket assembly 14 can be applied to the front sprocket.

In this application, the following directional terms "front", "back", "forward", "backward", "left", "right", "landscape", "up" and "down" and any other Similar directional terms refer to directions determined based on users (e.g., riders) sitting on the seat (not shown) of a bicycle and facing the handlebars (not shown). Therefore, when these terms are used to describe the bicycle transmission system 10, the bicycle hub assembly 12, or the bicycle rear sprocket assembly 14, they should refer to the bicycle transmission system 10 that is equipped as used in the upright riding position on a horizontal surface. , The bicycle wheel hub assembly 12 or the bicycle rear sprocket assembly 14 is interpreted.

As seen in FIGS. 2 and 3, the bicycle hub assembly 12 and the bicycle rear sprocket assembly 14 have a rotation center axis A1. The bicycle rear sprocket assembly 14 is rotatably supported by the bicycle hub assembly 12 about the rotation center axis A1 relative to the bicycle frame BF (FIG. 1 ). Bicycle rear sprocket assembly 14 is configured to engage with the bicycle chain 20 so as to transmit the transmission rotational force F1 between the bicycle chain 20 and the bicycle rear sprocket assembly 14 during pedaling. During pedaling, the bicycle rear sprocket assembly 14 rotates about the rotation center axis A1 in the transmission rotation direction D11. The driving rotation direction D11 is defined along the circumferential direction D1 of the bicycle hub assembly 12 or the bicycle rear sprocket assembly 14. The reverse rotation direction D12 is the opposite direction of the transmission rotation direction D11, and is defined along the circumferential direction D1.

As seen in FIG. 2, the bicycle hub assembly 12 includes a sprocket support body 28. The bicycle rear sprocket assembly 14 is installed on the sprocket support main body 28 to transmit the transmission rotational force F1 between the sprocket support main body 28 and the bicycle rear sprocket assembly 14. The bicycle hub assembly 12 further includes a hub axle 30. The sprocket support body 28 is rotatably mounted on the hub axle 30 around the rotation center axis A1. The bicycle rear sprocket assembly 14 further includes a locking member 32. The locking member 32 is fastened to the sprocket support body 28 to hold the bicycle rear sprocket assembly 14 relative to the sprocket support body 28 in an axial direction D2 parallel to the rotation center axis A1.

As seen in FIG. 4, the bicycle hub assembly 12 is fastened to the bicycle frame BF by the wheel fastening structure WS. The hub axle 30 has a through hole 30A. The fastening rod WS1 of the wheel fastening structure WS extends through the through hole 30A of the hub axle 30. The hub axle 30 includes a first shaft end 30B and a second shaft end 30C. The hub shaft 30 extends between the first shaft end 30B and the second shaft end 30C along the rotation center axis A1. The first shaft end 30B is disposed in the first groove BF11 of the first frame BF1 of the bicycle frame BF. The second shaft end 30C is disposed in the second groove BF21 of the second frame BF2 of the bicycle frame BF. The hub axle 30 is held between the first frame BF1 and the second frame BF2 by the wheel fastening structure WS. The wheel fastening structure WS includes a structure known in the applied bicycle. Therefore, for the sake of brevity, a detailed description will not be given here.

As seen in Figures 4 and 5, the bicycle hub assembly 12 further includes a brake rotor supporting the main 体34. The brake rotor support body 34 is rotatably mounted on the hub axle 30 around the rotation center axis A1. The brake rotor support body 34 is coupled to the bicycle brake rotor 16 (FIG. 1) to transmit the braking rotation force from the bicycle brake rotor 16 to the brake rotor support body 34.

As seen in FIG. 5, the bicycle hub assembly 12 further includes a hub body 36. The hub body 36 is rotatably mounted on the hub axle 30 around the rotation center axis A1. In this embodiment, the sprocket support body 28 is a separate member from the hub body 36. The brake rotor support body 34 and the hub body 36 are integrally provided as a one-piece unitary member. However, the sprocket support body 28 may be provided integrally with the hub body 36. The brake rotor support body 34 may be a separate member from the hub body 36.

The hub body 36 includes a first flange 36A and a second flange 36B. The first spoke (not shown) is coupled to the first flange 36A. The second spoke (not shown) is coupled to the second flange 36B. The second flange 36B is spaced apart from the first flange 36A in the axial direction D2. The first flange 36A is provided between the sprocket support body 28 and the second flange 36B in the axial direction D2. The second flange 36B is provided between the first flange 36A and the brake rotor support body 34 in the axial direction D2.

The locking member 32 includes an outer threaded portion 32A. The sprocket support body 28 includes an inner threaded portion 28A. In a state where the locking member 32 is fastened to the sprocket support body 28, the outer threaded portion 32A is threadedly engaged with the inner threaded portion 28A.

As seen in FIG. 6, the locking member 32 is configured to prevent at least one sprocket mounted on the bicycle hub assembly 12 from moving axially relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14. As seen in FIG. 5, the locking member 32 includes a tubular body portion 32C and a protruding portion 32B. The tubular body portion 32C has a center axis A2. The protruding portion 32B extends radially outward from the tubular body portion 32C with respect to the central axis A2 of the tubular body portion 32C. The tubular body portion 32C has an outer threaded portion that is configured to engage with the inner threaded portion 28A of the bicycle hub assembly 12 Points 32A.

As seen in Figure 6, the protruding portion 32B is configured to abut at least one sprocket. In this embodiment, the protruding portion 32B is configured to abut the sprocket SP1. The tubular body portion 32C has a first outer diameter ED1 equal to or smaller than 26 mm. The first outer diameter ED1 is equal to or greater than 25 mm. In this embodiment, the first outer diameter ED1 is 25.45 mm. However, the first outer diameter ED1 is not limited to this embodiment and the above range. The protruding portion 32B has a second outer diameter ED2 equal to or smaller than 32 mm. The second outer diameter ED2 is equal to or greater than 30 mm. In this embodiment, the second outer diameter ED2 is 31.5 mm. However, the second outer diameter ED2 is not limited to this embodiment and the above range.

As seen in FIG. 5, the locking member 32 has a tool engaging portion 32D. The tool engaging portion 32D is provided on the inner peripheral surface 32C1 of the tubular body portion 32C to engage with the tool. The tool engaging portion 32D includes a plurality of tool engaging grooves 32D1 provided on the inner peripheral surface 32C1 of the tubular body portion 32C. However, the structure of the tool engaging portion 32D is not limited to this embodiment. In the illustrated embodiment, the tool engaging portion 32D may be omitted from the locking member 32, or may have another shape different from the tool engaging portion 32D.

As seen in FIG. 6, the bicycle hub assembly 12 further includes a ratchet structure 38. The sprocket support body 28 is operatively coupled to the hub body 36 by the ratchet structure 38. The ratchet structure 38 is configured to couple the sprocket support body 28 to the hub body 36 to rotate the sprocket support body 28 together with the hub body 36 in the driving rotation direction D11 (FIG. 5) during pedaling. The ratchet structure 38 is configured to allow the sprocket support body 28 to rotate relative to the hub body 36 in the reverse rotation direction D12 (FIG. 5) during idling. Therefore, the ratchet structure 38 can be interpreted as a one-way coupling structure 38. The ratchet structure 38 includes a structure known in the bicycle field. Therefore, for the sake of brevity, a detailed description will not be given here.

The bicycle hub assembly 12 includes a first bearing 39A and a second bearing 39B. The first bearing 39A And the second bearing 39B is provided between the sprocket support body 28 and the hub axle 30 to rotatably support the sprocket support body 28 relative to the hub axle 30 about the rotation center axis A1.

In this embodiment, each of the sprocket support body 28, the brake rotor support body 34, and the hub body 36 is made of a metal material such as aluminum, iron, or titanium. However, at least one of the sprocket support body 28, the brake rotor support body 34, and the hub body 36 may be made of a non-metallic material.

As seen in Figures 7 and 8, the sprocket support body 28 includes at least one external spline tooth 40 that is configured to mesh with the bicycle rear sprocket assembly 14 (Figure 6). The sprocket support body 28 includes a plurality of external spline teeth 40 that are configured to mesh with the bicycle rear sprocket assembly 14 (FIG. 6). That is, at least one external spline tooth 40 includes a plurality of external spline teeth 40. The sprocket support body 28 includes at least nine external spline teeth 40 that are configured to mesh with the bicycle rear sprocket assembly 14 (Figure 6). The sprocket support body 28 includes at least ten external spline teeth 40 that are configured to mesh with the bicycle rear sprocket assembly 14 (FIG. 6).

The sprocket supporting body 28 includes a base support 41 having a tubular shape. The base support 41 extends along the rotation center axis A1. The outer spline teeth 40 extend radially outward from the base support 41. The sprocket supporting body 28 includes a larger diameter portion 42, a flange 44 and a plurality of spiral external spline teeth 46. The larger diameter portion 42 and the flange 44 extend radially outward from the base support 41. The larger diameter portion 42 is provided between the plurality of external spline teeth 40 and the flange 44 in the axial direction D2. The larger diameter portion 42 and the flange 44 are provided between the plurality of external spline teeth 40 and the plurality of spiral external spline teeth 46 in the axial direction D2. As seen in FIG. 6, the bicycle rear sprocket assembly 14 is held between the larger diameter portion 42 and the protruding portion 32B of the locking member 32 in the axial direction D2. The larger diameter portion 42 may have an internal cavity, so that a transmission structure such as a one-way coupling structure can be accommodated in the internal cavity. If necessary, the larger diameter portion 42 may be omitted from the bicycle hub assembly 12.

As seen in Figure 9, the total number of at least ten external spline teeth 40 is equal to or greater than 20. The total number of at least ten external spline teeth 40 is equal to or greater than 25. In this embodiment, the total number of at least ten external spline teeth 40 is 26. However, the total number of external spline teeth 40 is not limited to this embodiment and the above range.

At least ten outer spline teeth 40 have a first outer peripheral pitch angle PA11 and a second outer peripheral pitch angle PA12. At least two of the plurality of external spline teeth 40 are circumferentially arranged with respect to the rotation center axis A1 of the bicycle hub assembly 12 at a first external peripheral pitch angle PA11. At least two of the plurality of outer spline teeth 40 are circumferentially arranged with respect to the rotation center axis A1 of the bicycle hub assembly 12 at a second outer peripheral pitch angle PA12. In this embodiment, the second outer peripheral pitch angle PA12 is different from the first outer peripheral pitch angle PA11. However, the second outer circumferential pitch angle PA12 may be substantially equal to the first outer circumferential pitch angle PA11.

In this embodiment, the outer spline teeth 40 are arranged at the first outer peripheral pitch angle PA11 in the circumferential direction D1. Two of the outer spline teeth 40 are arranged at the second outer peripheral pitch angle PA12 in the circumferential direction D1. However, at least two of the outer spline teeth 40 may be arranged at another outer pitch angle in the circumferential direction D1.

The first outer pitch angle PA11 is in the range of 10 degrees to 20 degrees. The first outer pitch angle PA11 is in the range of 12 degrees to 15 degrees. The first outer peripheral pitch angle PA11 is in the range of 13 degrees to 14 degrees. In this embodiment, the first outer peripheral pitch angle PA11 is 13.3 degrees. However, the first outer circumferential pitch angle PA11 is not limited to this embodiment and the above range.

The second circumferential pitch angle PA12 is in the range of 5 degrees to 30 degrees. In this embodiment, the second outer peripheral pitch angle PA12 is 26 degrees. However, the second outer circumferential pitch angle PA12 is not limited to this embodiment and the above range.

The outer spline teeth 40 have substantially the same shape as each other. The external spline teeth 40 have substantial The same spline size on each other. When viewed along the rotation center axis A1, the outer spline teeth 40 have substantially the same profile as each other. However, as seen in FIG. 10, at least one of the at least ten external spline teeth 40 may have a first spline shape that is different from the second spline shape of the other of the at least ten external spline teeth 40 . At least one of the at least ten external spline teeth 40 may have a first spline size different from the second spline size of another one of the at least ten external spline teeth 40. When viewed along the rotation center axis A1, at least one of the at least ten external spline teeth 40 may have a profile different from that of another of the at least ten external spline teeth 40. In FIG. 10, one of the external spline teeth 40 has a spline shape different from the spline shape of the other teeth in the external spline teeth 40. One of the outer spline teeth 40 has a spline size different from the spline size of the other teeth in the outer spline teeth 40. When viewed along the rotation center axis A1, one of the outer spline teeth 40 has a profile different from the profile of the other teeth in the outer spline teeth 40.

As seen in FIG. 11, each of the at least ten outer spline teeth 40 has an outer spline transmission surface 48 and an outer spline non-transmission surface 50. The plurality of external spline teeth 40 includes a plurality of external spline transmission surfaces 48 for receiving the transmission rotational force F1 from the bicycle rear sprocket assembly 14 (FIG. 6) during pedaling. The plurality of external spline teeth 40 includes a plurality of external spline non-transmission surfaces 50. The outer spline transmission surface 48 can be in contact with the bicycle rear sprocket assembly 14 to receive the transmission rotational force F1 from the bicycle rear sprocket assembly 14 (FIG. 6) during pedaling. The outer spline transmission surface 48 faces the reverse rotation direction D12. The outer spline non-transmission surface 50 is provided on the opposite side of the outer spline transmission surface 48 in the circumferential direction D1. The outer spline non-transmission surface 50 faces the transmission rotation direction D11 so as not to receive the transmission rotation force F1 from the bicycle rear sprocket assembly 14 during pedaling.

At least ten external spline teeth 40 each have a maximum circumferential width MW1. The outer spline teeth 40 each have a maximum circumferential width MW1. The maximum width of the circumference MW1 is defined as receiving applied to the outside The maximum width of the thrust F2 of the spline tooth 40. The maximum circumferential width MW1 is defined as the linear distance based on the external spline transmission surface 48.

Each of the plurality of outer spline transmission surfaces 48 includes a radially outermost edge 48A and a radially innermost edge 48B. The outer spline transmission surface 48 extends from the radially outermost edge 48A to the radially innermost edge 48B. The first reference circle RC11 is defined on the radially innermost edge 48B and is centered on the rotation center axis A1. The first reference circle RC11 intersects the outer spline non-transmission surface 50 at a reference point 50R. The maximum circumferential width MW1 extends linearly from the radially innermost edge 48B to the reference point 50R in the circumferential direction D1.

Each of the plurality of outer spline non-transmission surfaces 50 includes a radially outermost edge 50A and a radially innermost edge 50B. The outer spline non-transmission surface 50 extends from the radially outermost edge 50A to the radially innermost edge 50B. The reference point 50R is provided between the radially outermost edge 50A and the radially innermost edge 50B. However, the reference point 50R may coincide with the radially innermost edge 50B.

The sum of the maximum circumferential width MW1 is equal to or greater than 55mm. The sum of the maximum circumference MW1 is equal to or greater than 60mm. The sum of the maximum circumferential width MW1 is equal to or greater than 65mm. In this embodiment, the sum of the maximum circumferential width MW1 is 68 mm. However, the sum of the maximum circumferential width MW1 is not limited to this embodiment and the above range.

As seen in Figure 12, at least one outer spline tooth 40 has an outer spline tip diameter DM11. The top diameter of the outer spline DM11 is equal to or greater than 25mm. The top diameter of the outer spline DM11 is equal to or greater than 29mm. The top diameter of the external spline DM11 is equal to or less than 30mm. In this embodiment, the top diameter DM11 of the outer spline is 29.6 mm. However, the outer spline top diameter DM11 is not limited to this embodiment and the above range.

At least one outer spline tooth 40 has an outer spline bottom diameter DM12. At least one external spline tooth 40 has an external spline tooth root circle RC12, and the external spline tooth root circle RC12 has an external spline bottom diameter DM12. However, the outer spline root circle RC12 may have another diameter different from the outer spline bottom diameter DM12. The bottom diameter of the outer spline DM12 is equal to or less than 28mm. The bottom diameter of the outer spline DM12 is equal to or greater than 25mm. The bottom diameter of the outer spline DM12 is equal to or greater than 27mm. In this embodiment, the bottom diameter DM12 of the outer spline is 27.2 mm. However, the outer spline bottom diameter DM12 is not limited to this embodiment and the above range.

The larger diameter portion 42 has an outer diameter DM13 larger than the top diameter DM11 of the outer spline. The outer diameter DM13 is in the range of 32mm to 40mm. In this embodiment, the outer diameter DM13 is 35 mm. However, the outer diameter DM13 is not limited to this embodiment.

As seen in FIG. 11, the plurality of outer spline transmission surfaces 48 each include a radial length RL11 defined from the radially outermost edge 48A to the radially innermost edge 48B. The sum of the radial length RL11 of the plurality of external spline transmission surfaces 48 is equal to or greater than 7 mm. The sum of the radial length RL11 is equal to or greater than 10mm. The sum of the radial length RL11 is equal to or greater than 15mm. In this embodiment, the total radial length RL11 is 19.5 mm. However, the sum of the radial length RL11 is not limited to this embodiment.

The plurality of external spline teeth 40 have a radial length RL12. The radial length RL12 is respectively defined from the outer spline tooth root circle RC12 to the radial outermost end 40A of the plurality of outer spline teeth 40. The sum of the radial length RL12 is equal to or greater than 12mm. In this embodiment, the total radial length RL12 is 31.85 mm. However, the sum of the radial length RL12 is not limited to this embodiment.

At least one of the at least nine external spline teeth 40 has an asymmetrical shape with respect to the circumferential tooth tip centerline CL1. The circumferential tooth tip centerline CL1 is a line connecting the rotation center axis A1 and the circumferential center point CP1 of the radially outermost end 40A of the outer spline tooth 40. However, at least one of the outer spline teeth 40 may have a symmetrical shape with respect to the circumferential tooth tip centerline CL1. At least one of the at least nine external spline teeth 40 includes an external spline transmission surface 48 and an external spline non-transmission surface 50.

The outer spline transmission surface 48 has a first outer spline surface angle AG11. The first outer spline surface angle AG11 is defined between the outer spline transmission surface 48 and the first radial line L11. The first radial line L11 extends from the rotation center axis A1 of the bicycle hub assembly 12 to the radially outermost edge 48A of the outer spline transmission surface 48. The first outer circumferential pitch angle PA11 or the second outer circumferential pitch angle PA12 is defined between adjacent first radial lines L11 (see, for example, FIG. 9).

The outer spline non-transmission surface 50 has a second outer spline surface angle AG12. The second outer spline surface angle AG12 is defined between the outer spline non-transmission surface 50 and the second radial line L12. The second radial line L12 extends from the rotation center axis A1 of the bicycle hub assembly 12 to the radially outermost edge 50A of the outer spline non-transmission surface 50.

In this embodiment, the second outer spline surface angle AG12 is different from the first outer spline surface angle AG11. The first outer spline surface angle AG11 is smaller than the second outer spline surface angle AG12. However, the first outer spline surface angle AG11 may be equal to or greater than the second outer spline surface angle AG12.

The first outer spline surface angle AG11 is in the range of 0 degrees to 10 degrees. The second outer spline surface angle AG12 is in the range of 0 degrees to 60 degrees. In this embodiment, the first outer spline surface angle AG11 is 5 degrees. The second outer spline surface angle AG12 is 45 degrees. However, the first outer spline surface angle AG11 and the second outer spline surface angle AG12 are not limited to this embodiment and above.

As seen in Figures 13 and 14, the brake rotor support body 34 includes at least one additional external spline tooth 52 that is configured to mesh with the bicycle brake rotor 16 (Figure 4). In this embodiment, the brake rotor support body 34 includes an additional base support 54 and a plurality of additional external spline teeth 52. The additional base support 54 has a tubular shape and extends from the hub main body 36 along the rotation center axis A1. The additional external spline teeth 52 extend radially outward from the additional base support 54. The total number of additional external spline teeth 52 is 52. However, the total number of additional external spline teeth 52 is not limited to this embodiment.

As seen in Figure 14, at least one additional external spline tooth 52 has an additional external spline tip diameter DM14. As seen in Figure 15, the additional external spline top diameter DM14 is larger than the external spline top diameter DM11. The additional outer spline top diameter DM14 is substantially equal to the outer diameter DM13 of the larger diameter portion 42. However, the additional external spline top diameter DM14 may be equal to or smaller than the external spline top diameter DM11. The additional outer spline top diameter DM14 may be different from the outer diameter DM13 of the larger diameter portion 42.

As seen in Figure 16, the hub axle 30 includes an axial contact surface 30B1 for contacting the bicycle frame BF. In this embodiment, the axial contact surface 30B1 can contact the first frame BF1 of the bicycle frame BF. The first frame BF1 includes a frame contact surface BF12. In a state where the bicycle hub assembly 12 is fastened to the bicycle frame BF by the wheel fastening structure WS, the axial contact surface 30B1 is in contact with the frame contact surface BF12.

The first axial length AL11 is defined from the axial contact surface 30B1 to the larger diameter portion 42 in the axial direction D2 relative to the rotation center axis A1. The first axial length AL11 is in the range of 35mm to 41mm. The first axial length AL11 may be equal to or greater than 39 mm. The first axial length AL11 can also be in the range of 35mm to 37mm. In this embodiment, the first axial length AL11 is 36.2 mm. However, the first axial length AL11 is not limited to this embodiment and the above range.

The larger diameter portion 42 has an axial end 42A farthest from the axial contact surface 30B1 in the axial direction D2. The second axial length AL12 is defined from the axial contact surface 30B1 to the axial end 42A in the axial direction D2. The second axial length AL12 is in the range of 38mm to 47mm. The second axial length AL12 may be in the range of 44mm to 45mm. The second axial length AL12 can also be in the range of 40mm to 41mm. In this embodiment, the second axial length AL12 is 40.75 mm. However, the second axial length AL12 is not limited to this embodiment and the above range.

The axial length AL13 of the larger diameter portion 42 is in the range of 3 mm to 6 mm. In this embodiment, the axial length AL13 is 4.55 mm. However, the axial length AL13 is not limited to this embodiment and the above range.

As seen in Figure 17, the bicycle rear sprocket assembly 14 includes at least one sprocket. At least one sprocket includes a plurality of sprocket wheels. The at least one sprocket includes at least ten sprockets. The at least one sprocket includes at least eleven sprockets. The at least one sprocket includes at least twelve sprockets. The plurality of sprockets includes the largest sprocket SP12. The largest sprocket SP12 has a tooth tip diameter TD1. The plural sprockets also include the smallest sprockets SP1. The smallest sprocket SP1 may also be referred to as a sprocket SP1. The largest sprocket SP12 may also be referred to as a sprocket SP12. In this embodiment, at least one sprocket further includes sprockets SP2 to SP11. The sprocket SP1 corresponds to a high-speed gear. Sprocket SP12 corresponds to a low-speed gear. In this embodiment, the total number of the plurality of sprockets is 12. However, the total number of sprockets of the bicycle rear sprocket assembly 14 is not limited to this embodiment.

The smallest sprocket SP1 includes at least one sprocket SP1B. The total number of at least one sprocket SP1B of the smallest sprocket SP1 is 10 or less. In this embodiment, the total number of at least one sprocket SP1B of the smallest sprocket SP1 is 10. However, the total number of at least one sprocket SP1B of the smallest sprocket SP1 is not limited to this embodiment and above.

The largest sprocket SP12 includes at least one sprocket SP12B. The total number of teeth of the largest sprocket SP12 is equal to or greater than 39. The total number of teeth of the largest sprocket SP12 is equal to or greater than 45. The total number of at least one sprocket SP12B of the largest sprocket SP12 is equal to or greater than 46. The total number of at least one sprocket SP12B of the largest sprocket SP12 is equal to or greater than 50. In this embodiment, the total number of at least one sprocket SP12B of the largest sprocket SP12 is 51. However, the total number of at least one sprocket SP12B of the largest sprocket SP12 is not limited to this embodiment and above. The tooth tip diameter TD1 is the diameter of a circle defined by the tooth tip of the sprocket SP12B.

The sprocket SP2 includes at least one sprocket SP2B. The sprocket SP3 includes at least one sprocket SP3B. The sprocket SP4 includes at least one sprocket SP4B. The sprocket SP5 includes at least one sprocket SP5B. The sprocket SP6 includes at least one sprocket SP6B. The sprocket SP7 includes at least one sprocket SP7B. The sprocket SP8 includes at least one sprocket SP8B. The sprocket SP9 includes at least one sprocket SP9B. The sprocket SP10 includes at least one sprocket SP10B. The sprocket SP11 includes at least one sprocket SP11B.

The total number of at least one sprocket SP2B is 12. The total number of at least one sprocket SP3B is 14. The total number of at least one sprocket SP4B is 16. The total number of at least one sprocket SP5B is 18. The total number of at least one sprocket SP6B is 21. The total number of at least one sprocket SP7B is 24. The total number of at least one sprocket SP8B is 28. The total number of at least one sprocket SP9B is 33. The total number of at least one sprocket SP10B is 39. The total number of at least one sprocket SP11B is 45. At least one sprocket has a total number of teeth equal to or greater than 15. For example, the total number of teeth of the sprocket SP4 is 16. The total number of teeth of the sprocket SP5 is 18. The total number of teeth of the sprocket SP6 is 21. The total number of teeth of the sprocket SP7 is 24. The total number of teeth of the sprocket SP8 is 28. The total number of teeth of the sprocket SP9 is 33. The total number of teeth of the sprocket SP10 is 39. The total number of teeth of the sprocket SP11 is 45. The total number of teeth of the sprocket SP12 is 51. The total number of sprocket teeth of each of the sprockets SP2 to SP11 is not limited to this embodiment. At least one of the sprockets SP1 to SP12 may include a total number of teeth equal to or greater than 15 teeth.

As seen in FIG. 18, the sprockets SP1 to SP12 are members separated from each other. However, at least one of the sprockets SP1 to SP12 may be at least partially provided integrally with the other of the sprockets SP1 to SP12. The bicycle rear sprocket assembly 14 further includes a sprocket support 56, a plurality of spacers 58, a first ring 59A and a second ring 59B. In the illustrated embodiment, a plurality of sprockets SP1 to SP12 are attached to the sprocket support 56. For example, a plurality of sprockets SP1 to SP12 are attached to the sprocket support 56 by an adhesive.

As seen in Fig. 19, the sprocket SP1 includes a sprocket main body SP1A and a plurality of sprocket teeth SP1B. The plural sprocket teeth SP1B extend radially outward from the sprocket main body SP1A. The sprocket SP2 includes a sprocket main body SP2A and a plurality of sprocket teeth SP2B. A plurality of sprocket teeth SP2B extend radially outward from the sprocket main body SP2A. The sprocket SP3 includes a sprocket main body SP3A and a plurality of sprocket teeth SP3B. A plurality of sprocket teeth SP3B extend radially outward from the sprocket main body SP3A. The sprocket SP4 includes a sprocket main body SP4A and a plurality of sprocket teeth SP4B. A plurality of sprocket teeth SP4B extend radially outward from the sprocket main body SP4A. The sprocket SP5 includes a sprocket main body SP5A and a plurality of sprocket teeth SP5B. A plurality of sprocket teeth SP5B extend radially outward from the sprocket main body SP5A. The first ring 59A is provided between the sprocket SP3 and the sprocket SP4. The second ring 59B is provided between the sprocket SP4 and the sprocket SP5.

As seen in FIG. 20, the sprocket SP6 includes a sprocket main body SP6A and a plurality of sprocket teeth SP6B. A plurality of sprocket teeth SP6B extend radially outward from the sprocket main body SP6A. The sprocket SP7 includes a sprocket main body SP7A and a plurality of sprocket teeth SP7B. The plurality of sprocket teeth SP7B extend radially outward from the sprocket main body SP7A. The sprocket SP8 includes a sprocket main body SP8A and a plurality of sprocket teeth SP8B. A plurality of sprocket teeth SP8B extend radially outward from the sprocket main body SP8A.

As seen in FIG. 21, the sprocket SP9 includes a sprocket main body SP9A and a plurality of sprocket teeth SP9B. A plurality of sprocket teeth SP9B extend radially outward from the sprocket main body SP9A. The sprocket SP10 includes a sprocket main body SP10A and a plurality of sprocket teeth SP10B. A plurality of sprocket teeth SP10B extend radially outward from the sprocket main body SP10A. The sprocket SP11 includes a sprocket main body SP11A and a plurality of sprocket teeth SP11B. A plurality of sprocket teeth SP11B extend radially outward from the sprocket main body SP11A. The sprocket SP12 includes a sprocket main body SP12A and a plurality of sprocket teeth SP12B. A plurality of sprocket teeth SP12B extends radially outward from the sprocket main body SP12A.

As seen in FIG. 22, the sprocket support 56 includes a hub engagement portion 60 and a plurality of support arms 62. A plurality of support arms 62 extend radially outward from the hub engaging portion 60. The support arm 62 includes a An attachment portion 62A to an eighth attachment portion 62H. The plurality of spacers 58 includes a plurality of first spacers 58A, a plurality of second spacers 58B, a plurality of third spacers 58C, a plurality of fourth spacers 58D, a plurality of fifth spacers 58E, and a plurality of sixth spacers. Spacer 58F and a plurality of seventh spacers 58G.

As seen in FIG. 23, the first spacer 58A is provided between the sprocket SP5 and the sprocket SP6. The second spacer 58B is provided between the sprocket SP6 and the sprocket SP7. The third spacer 58C is provided between the sprocket SP7 and the sprocket SP8. The fourth spacer 58D is provided between the sprocket SP8 and the sprocket SP9. The fifth spacer 58E is provided between the sprocket SP9 and the sprocket SP10. The sixth spacer 58F is provided between the sprocket SP10 and the sprocket SP11. The seventh spacer 58G is provided between the sprocket SP11 and the sprocket SP12.

The sprocket SP6 and the first spacer 58A are attached to the first attachment portion 62A by an adhesive structure such as an adhesive. The sprocket SP7 and the second spacer 58B are attached to the second attachment portion 62B by an adhesive structure such as an adhesive. The sprocket SP8 and the third spacer 58C are attached to the third attachment portion 62C by an adhesive structure such as an adhesive. The sprocket SP9 and the fourth spacer 58D are attached to the fourth attachment portion 62D by an adhesive structure such as an adhesive. The sprocket SP10 and the fifth spacer 58E are attached to the fifth attachment portion 62E by an adhesive structure such as an adhesive. The sprocket SP11 and the sixth spacer 58F are attached to the sixth attachment portion 62F by an adhesive structure such as an adhesive. The sprocket SP12 and the seventh spacer 58G are attached to the seventh attachment portion 62G by an adhesive structure such as an adhesive. The sprocket SP5 and the second ring 59B are attached to the eighth attachment portion 62H by an adhesive structure such as an adhesive. The hub engaging portion 60, the sprockets SP1 to SP4, the first ring 59A and the second ring 59B are held between the larger diameter portion 42 and the protruding portion 32B of the locking member 32 in the axial direction D2.

In this embodiment, each of the sprockets SP1 to SP12 is made of a metal material such as aluminum, iron, or titanium. Sprocket support 56, first spacer 58A to seventh spacer 58G, first ring Each of 59A and the second ring 59B is made of a non-metallic material such as a resin material. The sprocket support 56 is made of non-metallic materials including resin materials. However, at least one of the sprockets SP1 to SP12 may be at least partially made of a non-metallic material. At least one of the sprocket support 56, the first spacer 58A to the seventh spacer 58G, the first ring 59A, and the second ring 59B may be at least partially made of a metal material such as aluminum, iron, or titanium.

At least one sprocket includes at least one internal spline tooth that is configured to mesh with the bicycle hub assembly 12. As seen in Figures 24 and 25, at least one sprocket includes at least ten internal spline teeth that are configured to mesh with the bicycle hub assembly 12. The at least one internal spline tooth includes a plurality of internal spline teeth. Therefore, at least one sprocket includes a plurality of internal spline teeth that are configured to mesh with the bicycle hub assembly 12. In this embodiment, the sprocket SP1 includes at least ten internal spline teeth 64 that are configured to mesh with the bicycle hub assembly 12. In this embodiment, the sprocket SP1 includes internal spline teeth 64 that are configured to mesh with the external spline teeth 40 of the sprocket support body 28 of the bicycle hub assembly 12. The sprocket main body SP1A has an annular shape. The internal spline teeth 64 extend radially inward from the sprocket main body SP1A.

As seen in FIG. 26, the total number of at least ten internal spline teeth 64 is equal to or greater than 20. The total number of at least ten internal spline teeth 64 is equal to or greater than 25. In this embodiment, the total number of internal spline teeth 64 is 26. However, the total number of internal spline teeth 64 is not limited to this embodiment and above.

At least ten inner spline teeth 64 have a first inner circumferential pitch angle PA21 and a second inner circumferential pitch angle PA22. At least two of the plurality of internal spline teeth 64 are circumferentially arranged with respect to the rotation center axis A1 of the bicycle rear sprocket assembly 14 at the first internal peripheral pitch angle PA21. At least two of the plurality of internal spline teeth 64 are circumferentially arranged at a second internal peripheral pitch angle PA22 with respect to the rotation center axis A1. In this embodiment, the second inner circumferential pitch angle PA22 is different from The first inner circumferential section angle PA21. However, the second inner circumferential pitch angle PA22 may be substantially equal to the first inner circumferential pitch angle PA21.

In this embodiment, the internal spline teeth 64 are circumferentially arranged with the first internal pitch angle PA21 in the circumferential direction D1. Two of the internal spline teeth 64 are arranged at the second internal peripheral pitch angle PA22 in the circumferential direction D1. However, at least two of the internal spline teeth 64 may be arranged at another internal pitch angle in the circumferential direction D1.

The first inner circumferential pitch angle PA21 is in the range of 10 degrees to 20 degrees. The first inner pitch angle PA21 is in the range of 12 degrees to 15 degrees. The first inner pitch angle PA21 is in the range of 13 degrees to 14 degrees. In this embodiment, the first inner circumferential pitch angle PA21 is 13.3 degrees. However, the first inner circumferential pitch angle PA21 is not limited to this embodiment and the above range.

The second inner circumferential pitch angle PA22 is in the range of 5 degrees to 30 degrees. In this embodiment, the second inner circumferential pitch angle PA22 is 26 degrees. However, the second inner circumferential pitch angle PA22 is not limited to this embodiment and the above range.

At least one of the at least ten internal spline teeth 64 has a first spline shape that is different from the second spline shape of another one of the at least ten internal spline teeth 64. At least one of the at least ten internal spline teeth 64 has a first spline size that is different from the second spline size of another one of the at least ten internal spline teeth 64. At least one of the at least ten internal spline teeth 64 has a cross-sectional shape different from the cross-sectional shape of another one of the at least ten internal spline teeth 64. However, as seen in FIG. 27, the internal spline teeth 64 may have the same shape as each other. The internal spline teeth 64 may have the same size as each other. The internal spline teeth 64 may have the same cross-sectional shape as each other.

As seen in FIG. 28, at least one internal spline tooth 64 includes an internal spline transmission surface 66 and an internal spline non-transmission surface 68. The at least one internal spline tooth 64 includes a plurality of internal spline teeth 64. A plurality of internal spline teeth 64 are included to receive from the bicycle hub assembly during pedaling 12 (FIG. 6) A plurality of internal spline transmission surfaces 66 that transmit rotational force F1. The plurality of internal spline teeth 64 includes a plurality of internal spline non-transmission surfaces 68. The internal spline transmission surface 66 may be in contact with the sprocket support body 28 to transmit the transmission rotational force F1 from the sprocket SP1 to the sprocket support body 28 during pedaling. The internal spline transmission surface 66 faces the transmission rotation direction D11. The inner spline non-transmission surface 68 is provided on the opposite side of the inner spline transmission surface 66 in the circumferential direction D1. The inner spline non-transmission surface 68 faces the reverse rotation direction D12 so that the transmission rotation force F1 is not transmitted from the sprocket SP1 to the sprocket support body 28 during pedaling.

At least ten internal spline teeth 64 each have a maximum circumferential width MW2. The inner spline teeth 64 each have a maximum circumferential width MW2. The maximum circumferential width MW2 is defined as the maximum width for receiving the thrust F3 applied to the internal spline teeth 64. The maximum circumferential width MW2 is defined as the linear distance based on the inner spline transmission surface 66.

The inner spline transmission surface 66 includes a radially outermost edge 66A and a radially innermost edge 66B. The inner spline transmission surface 66 extends from the radially outermost edge 66A to the radially innermost edge 66B. The second reference circle RC21 is defined on the radially outermost edge 66A and is centered on the rotation center axis A1. The second reference circle RC21 intersects the internal spline non-transmission surface 68 at a reference point 68R. The maximum circumferential width MW2 extends linearly from the radially innermost edge 66B to the reference point 68R in the circumferential direction D1.

The inner spline non-drive surface 68 includes a radially outermost edge 68A and a radially innermost edge 68B. The inner spline non-drive surface 68 extends from the radially outermost edge 68A to the radially innermost edge 68B. The reference point 68R is provided between the radially outermost edge 68A and the radially innermost edge 68B.

The sum of the maximum width MW2 of the circumference is equal to or greater than 40mm. The sum of the maximum circumference MW2 is equal to or greater than 45mm. The sum of the maximum circumferential width MW2 is equal to or greater than 50mm. In this embodiment, the sum of the maximum circumference MW2 is 50.8 mm. However, the sum of the maximum circumferential width MW2 is not limited to this embodiment.

As seen in Figure 29, at least one internal spline tooth 64 has an internal spline tip diameter DM21. At least one internal spline tooth 64 has an internal spline tooth root circle RC22, and the internal spline tooth root circle RC22 has an internal spline tip diameter DM21. However, the inner spline root circle RC22 may have another diameter different from the inner spline tip diameter DM21. The top diameter of the inner spline DM21 is equal to or less than 30mm. The top diameter of the inner spline DM21 is equal to or greater than 25mm. The top diameter of the inner spline DM21 is equal to or greater than 29mm. In this embodiment, the top diameter DM21 of the internal spline is 29.6 mm. However, the inner spline top diameter DM21 is not limited to this embodiment and the above range. In this embodiment, the ratio of the inner spline tip diameter DM21 to the tooth tip diameter TD1 is in the range of 0.1 to 0.2. The tooth tip diameter TD1 of the largest sprocket SP12 (Figure 1) is within the range of 183.7mm to 207.9mm. The ratio of the inner spline tip diameter DM21 to the tooth tip diameter TD1 is in the range of 0.14 to 0.17. However, the ratio of the inner spline tip diameter DM21 to the tooth tip diameter TD1 is not limited to the above range.

At least one internal spline tooth 64 has an internal spline bottom diameter DM22 equal to or less than 28 mm. The inner spline bottom diameter DM22 is equal to or greater than 25mm. The inner spline bottom diameter DM22 is equal to or greater than 27mm. In this embodiment, the inner spline bottom diameter DM22 is 27.7 mm. However, the inner spline bottom diameter DM22 is not limited to this embodiment and the above range.

As seen in Fig. 28, the plurality of inner spline transmission surfaces 66 include a radially outermost edge 66A and a radially innermost edge 66B. Each of the plurality of internal spline transmission surfaces 66 includes a radial length RL21 defined from the radially outermost edge 66A to the radially innermost edge 66B. The sum of the radial length RL21 of the plurality of internal spline transmission surfaces 66 is equal to or greater than 7 mm. The sum of the radial length RL21 is equal to or greater than 10mm. The sum of the radial length RL21 is equal to or greater than 15mm. In this embodiment, the total radial length RL21 is 19.5 mm. However, the sum of the radial length RL21 is not limited to this embodiment and the above range.

The plurality of internal spline teeth 64 have an additional radial length RL22. Extra radial length RL 22 minutes It is defined from the inner spline tooth root circle RC22 to the radially innermost end 64A of the plurality of inner spline teeth 64. The sum of the extra radial length RL22 is equal to or greater than 12mm. In this embodiment, the sum of the additional radial length RL22 is 27.95mm. However, the sum of the additional radial length RL22 is not limited to this embodiment and the above range.

At least one of the internal spline teeth 64 has an asymmetrical shape with respect to the circumferential tooth tip center line CL2. The circumferential tooth tip center line CL2 is a line connecting the rotation center axis A1 and the circumferential center point CP2 of the radially innermost end 64A of the inner spline tooth 64. However, at least one of the internal spline teeth 64 may have a symmetrical shape with respect to the circumferential tooth tip center line CL2. At least one of the internal spline teeth 64 includes an internal spline transmission surface 66 and an internal spline non-transmission surface 68.

The internal spline transmission surface 66 has a first internal spline surface angle AG21. The first inner spline surface angle AG21 is defined between the inner spline transmission surface 66 and the first radial line L21. The first radial line L21 extends from the rotation center axis A1 of the bicycle rear sprocket assembly 14 to the radially outermost edge 66A of the inner spline transmission surface 66. The first inner circumferential pitch angle PA21 or the second inner circumferential pitch angle PA22 is defined between adjacent first radial lines L21 (see, for example, FIG. 26).

The inner spline non-transmission surface 68 has a second inner spline surface angle AG22. The second inner spline surface angle AG22 is defined between the inner spline non-transmission surface 68 and the second radial line L22. The second radial line L22 extends from the rotation center axis A1 of the bicycle rear sprocket assembly 14 to the radially outermost edge 68A of the inner spline non-transmission surface 68.

In this embodiment, the second internal spline surface angle AG22 is different from the first internal spline surface angle AG21. The first inner spline surface angle AG21 is smaller than the second inner spline surface angle AG22. However, the first internal spline surface angle AG21 may be equal to or greater than the second internal spline surface angle AG22.

The first inner spline surface angle AG21 is in the range of 0 degrees to 10 degrees. The second inner spline surface angle AG22 is in the range of 0 degrees to 60 degrees. In this embodiment, the first inner spline surface angle AG21 is 5 degrees. The second inner spline surface angle AG22 is 45 degrees. However, the first internal spline surface angle AG21 and the second internal spline surface angle AG22 are not limited to this embodiment and above.

As seen in FIG. 30, the inner spline teeth 64 mesh with the outer spline teeth 40 to transmit the transmission rotational force F1 from the sprocket SP1 to the sprocket support body 28. The inner spline transmission surface 66 may contact the outer spline transmission surface 48 to transmit the transmission rotation force F1 from the sprocket SP1 to the sprocket support body 28. In a state where the inner spline transmission surface 66 is in contact with the outer spline transmission surface 48, the inner spline non-transmission surface 68 is spaced apart from the outer spline non-transmission surface 50.

As seen in FIG. 31, the sprocket SP2 includes a plurality of internal spline teeth 70. The sprocket SP3 includes a plurality of internal spline teeth 72. The sprocket SP4 includes a plurality of internal spline teeth 74. The first ring 59A includes a plurality of internal spline teeth 76. As seen in FIG. 32, the hub engaging portion 60 of the sprocket support 56 includes a plurality of internal spline teeth 78. The plurality of internal spline teeth 70 have substantially the same structure as the structure of the plurality of internal spline teeth 64. The plurality of internal spline teeth 72 have substantially the same structure as the structure of the plurality of internal spline teeth 64. The plurality of internal spline teeth 74 have substantially the same structure as the structure of the plurality of internal spline teeth 64. The plurality of internal spline teeth 76 have substantially the same structure as the structure of the plurality of internal spline teeth 64. The plurality of internal spline teeth 78 have substantially the same structure as the structure of the plurality of internal spline teeth 64. Therefore, for the sake of brevity, a detailed description will not be given here.

As seen in FIG. 6, the bicycle rear sprocket assembly 14 further includes a rear hub abutment surface 80. The rear hub abutment surface 80 is configured to abut the bicycle in the axial direction D2 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14 in the state where the bicycle rear sprocket assembly 14 is mounted to the bicycle hub assembly 12 Wheel hub assembly 12. In this embodiment, the rear hub abutment surface 80 abuts the larger diameter portion 42 of the sprocket support body 28 in the axial direction D2. The rear hub abutting surface 80 is provided on the hub engaging portion 60 of the sprocket support 56. However, the rear hub abutting surface 80 The location is not limited to this embodiment.

The largest sprocket SP12 has an axial inner surface SP12C and an axial outer surface SP12D disposed on the opposite side of the axial inner surface SP12C in the axial direction D2 relative to the rotation center axis A1 of the bicycle rear sprocket assembly 14 . Compared to the axially inner surface SP12C, the axially outer surface SP12D is closer to the rear hub abutment surface 80 in the axial direction D2.

As seen in Fig. 15, the bicycle hub assembly 12 has an axial center plane CPL that halves the bicycle hub assembly 12 in the axial direction D2. The axial center plane CPL of the bicycle hub assembly 12 is perpendicular to the rotation center axis A1. As seen in Figure 6, when the bicycle rear sprocket assembly 14 is mounted to the bicycle rear hub assembly 12, compared to the rear hub abutment surface 80, the axial inner surface SP12C is positioned closer to the bicycle rear hub assembly 12 is the axial center plane CPL. The axial distance AD1 defined between the axially inner surface SP12C and the rear hub abutting surface 80 in the axial direction D2 is equal to or greater than 7 mm. The axial distance AD1 is equal to or greater than 10 mm. However, the axial distance AD1 is not limited to the above range.

As seen in FIGS. 9 and 10, the sprocket support body 28 includes a hub indicator 28I provided at the axial end of the base support 41. When viewed along the rotation center axis A1, the hub indicator 28I is arranged in the area of the second outer circumferential pitch angle PA12. In this embodiment, the hub indicator 28I includes dots. However, the hub indicator 28I may include other shapes, such as triangles and lines. In addition, the hub indicator 28I may be a separate member attached to the sprocket support body 28 by, for example, an adhesive structure such as an adhesive. The position of the hub indicator 28I is not limited to this embodiment.

As seen in FIGS. 26 and 27, the sprocket SP1 includes a sprocket indicator SP1I provided at the axial end of the sprocket body SP1A. When viewed along the rotation center axis A1, the sprocket indicator SP1I is arranged in the area of the second inner circumferential pitch angle PA22. In this embodiment, the sprocket indicator SP1I includes dots. However, the sprocket indicator SP1I may include other shapes such as triangles and lines. In addition, The sprocket indicator SP1I may be, for example, a separate member attached to the sprocket SP1 by an adhesive structure such as an adhesive. The position of the sprocket indicator SP1I is not limited to this embodiment. The sprocket indicator SP1I can be provided to any one of the other sprockets SP2 to SP12. The sprocket indicator SP1I can also be provided to the sprocket support 56.

modify

FIG. 33 illustrates a bicycle rear sprocket assembly 214 according to a modification of the bicycle rear sprocket assembly 14. As seen in FIG. 33, the bicycle rear sprocket assembly 214 includes a sprocket SP1 and a plurality of sprockets SP202 to SP212. The sprockets SP202 to SP212 have substantially the same structure as that of the sprockets SP2 to SP12. As seen in FIGS. 33 and 34, for example, the sprocket SP212 includes a sprocket main body SP12A and a plurality of sprocket teeth SP12B.

One of the sprockets SP202 to SP212 may also be referred to as a first sprocket. The other sprocket adjacent to the first sprocket may also be referred to as the second sprocket. That is, at least one sprocket of the bicycle rear sprocket assembly 214 includes a first sprocket and a second sprocket. The first sprocket has a first total number of teeth. The second sprocket has a second total number of teeth less than the first total number of teeth. The second sprocket is adjacent to the first sprocket in the axial direction D2, and there is no other sprocket between the first sprocket and the second sprocket.

As seen in FIG. 33, for example, the first sprocket SP212 has a first total number of teeth of 51. The second sprocket SP211 has a second total number of teeth of 45. The sprockets SP212 and SP211 may also be referred to as the first sprockets SP212 and the second sprockets SP211. The sprockets SP211 and SP210 can also be referred to as the first sprockets SP211 and the second sprockets SP210. The sprockets SP210 and SP209 can also be referred to as the first sprockets SP210 and the second sprockets SP209. The sprockets SP209 and SP208 can also be referred to as the first sprockets SP209 and the second sprockets SP208. The sprockets SP208 and SP207 may also be referred to as the first sprockets SP208 and the second sprockets SP207. The sprockets SP207 and SP206 can also be referred to as the first sprockets SP207 and the second sprockets SP206. The sprockets SP206 and SP205 can also be called the first sprockets SP206 and the second sprockets SP205. The sprockets SP205 and SP204 can also be referred to as the first sprockets SP205 and the second sprockets SP204. The sprockets SP204 and SP203 may also be referred to as the first sprockets SP204 and the second sprockets SP203. The sprockets SP203 and SP202 can also be referred to as the first sprockets SP203 and the second sprockets SP202. The sprockets SP202 and SP1 can also be referred to as the first sprockets SP202 and the second sprockets SP1.

As seen in FIG. 34, for example, the first sprocket SP212 includes at least one first displacement promotion area SP212X to promote the first displacement operation of the bicycle chain 20 from the second sprocket SP211 to the first sprocket SP212 . The first sprocket SP212 includes at least one second displacement promotion area SP212Y to promote the second displacement operation of the bicycle chain 20 from the first sprocket SP212 to the second sprocket SP211. In this embodiment, the first sprocket SP212 includes a plurality of first displacement promotion regions SP212X to promote the first displacement operation of the bicycle chain 20 from the second sprocket SP211 to the first sprocket SP212. The first sprocket SP212 includes a plurality of second displacement promoting regions SP212Y to promote the second displacement operation of the bicycle chain 20 from the first sprocket SP212 to the second sprocket SP211.

The first sprocket SP212 includes a plurality of first displacement promoting grooves SP212X1 and a plurality of second displacement promoting grooves SP212Y1. The first displacement promoting groove SP212X1 is provided in the first displacement promoting region SP212X. The second displacement promoting groove SP212Y1 is provided in the second displacement promoting region SP212Y.

As seen in FIG. 35, the first displacement promoting groove SP212X1 is provided on the axial outer surface SP12D to reduce the interference between the first sprocket SP212 and the bicycle chain 20 (FIG. 33) in the first displacement operation. The second displacement promoting groove SP212Y1 is provided on the axial outer surface SP12D to reduce the interference between the first sprocket SP212 and the bicycle chain 20 (FIG. 33) in the second displacement operation. The second displacement promoting groove SP212Y1 is spaced apart from the first displacement promoting groove SP212X1 in the circumferential direction D1.

As seen in Figure 36, the plurality of sprocket teeth SP12B of the first sprocket SP212 includes a plurality of shifting Position promotion teeth SP212B1 to SP212B3. The displacement promoting teeth SP212B1 to SP212B3 are provided in the second displacement promoting region SP212Y. As seen in FIG. 34, the second displacement promoting region SP212Y is defined in the circumferential direction D1 by the second displacement promoting groove SP212Y1 and the displacement promoting teeth SP212B3.

As seen in FIG. 37, the displacement promoting tooth SP212B1 includes the promoting groove SP212R1. The displacement promoting tooth SP212B2 includes the promoting groove SP212R2. The displacement promoting tooth SP212B3 includes the promoting groove SP212R3. The promotion groove SP212R1 is provided on the axial inner surface SP12C to promote the derailment of the bicycle chain 20 from the first sprocket SP212 in the second displacement operation. The promotion groove SP212R2 is provided on the axial inner surface SP12C to promote the derailment of the bicycle chain 20 from the first sprocket SP212 in the second shifting operation. The promotion groove SP212R3 is provided on the axial inner surface SP12C to promote the derailment of the bicycle chain 20 from the first sprocket SP212 in the second shifting operation.

The first displacement promotion area and the second displacement promotion area of each of the sprockets SP202 to SP211 have the same structure as the first displacement promotion area SP212X and the second displacement promotion area SP212Y of the first sprocket SP212, respectively Substantially the same structure. For the sake of brevity, it will not be described in detail here. As used herein, the term "displacement promotion area" is intended to be an area that is deliberately designed to promote the displacement operation of the bicycle chain from one sprocket to another axially adjacent sprocket in the area.

As seen in FIG. 38, in the above-described embodiment, the outer spline teeth 40 may include grooves 40G provided between the outer spline transmission surface 48 and the outer spline non-transmission surface 50 in the circumferential direction D1. The groove 40G reduces the weight of the bicycle hub assembly 12.

As seen in Fig. 39, in the above-described embodiment, the internal spline teeth 64 may include grooves 64G provided between the internal spline transmission surface 66 and the internal spline non-transmission surface 68 in the circumferential direction D1. The groove 64G reduces the weight of the rear sprocket assembly 14 of the bicycle.

The term "comprising" and its derivatives as used herein are intended to specify the existence of stated features, elements, components, groups, integers and/or steps but not to exclude other unstated features, elements, components, groups, Open term for the existence of integers and/or steps. This concept also applies to words with similar meanings, such as the terms "have", "include" and their derivatives.

The terms "component", "section", "part", "part", "component", "body" and "structure" when used in the singular form can have the dual meaning of a single part or a plurality of parts.

The ordinal numbers such as "first" and "second" described in this application are only identifiers and do not have any other meaning, such as specific order and the like. In addition, for example, the term "first element" by itself does not imply the existence of "second element", and the term "second element" by itself does not imply the existence of "first element".

The term "pair" as used herein can encompass configurations in which the paired elements have different shapes or structures from each other except for the configuration in which the paired elements have the same shape or structure as each other.

Therefore, the terms "a", "one or more" and "at least one" are used interchangeably herein.

Finally, terms of degree such as "substantially", "approximately" and "approximately" as used herein mean a reasonable amount of deviation of the modified term so that the final result does not change significantly. All numerical values described in this application can be understood to include terms such as "substantially", "approximately" and "approximately".

Obviously, in view of the above teachings, many modifications and variations of the present invention are possible. Therefore, it should be understood that within the scope of the appended patent application, the present invention may be practiced in other ways than those specifically described herein.

14‧‧‧Bicycle rear sprocket assembly

20‧‧‧Bicycle chain

A1‧‧‧Rotation center axis

D1‧‧‧Circumference direction

D11‧‧‧Transmission rotation direction

D12‧‧‧Reverse rotation direction

SP1‧‧‧Sprocket

SP1B‧‧‧Sprocket

SP2‧‧‧Sprocket

SP2B‧‧‧Sprocket

SP3‧‧‧Sprocket

SP3B‧‧‧Sprocket

SP4‧‧‧Sprocket

SP4B‧‧‧Sprocket

SP5‧‧‧Sprocket

SP5B‧‧‧Sprocket

SP6‧‧‧Sprocket

SP6B‧‧‧Sprocket

SP7‧‧‧Sprocket

SP7B‧‧‧Sprocket

SP8‧‧‧Sprocket

SP8B‧‧‧Sprocket

SP9‧‧‧Sprocket

SP9B‧‧‧Sprocket

SP10‧‧‧Sprocket

SP10B‧‧‧Sprocket

SP11‧‧‧Sprocket

SP11B‧‧‧Sprocket

SP12‧‧‧Sprocket

SP12B‧‧‧Sprocket

TD1‧‧‧tooth tip diameter

XXIII-XXIII‧‧‧line

Claims (56)

A bicycle rear sprocket assembly, comprising: at least one sprocket having a total number of teeth equal to or greater than 15, the at least one sprocket including at least ten internal flowers configured to mesh with a bicycle hub assembly Key teeth; the at least ten internal spline teeth include at least ten internal spline transmission surfaces used to transmit a transmission rotational force to the bicycle hub assembly during pedaling, each of the at least ten internal spline transmission surfaces It includes a radially outermost edge, a radially innermost edge, and a radial length, which is defined from the radially outermost edge to the radially innermost edge, and one of the at least ten inner spline transmission surfaces The sum of one of the radial lengths is equal to or greater than 7 mm. For example, the bicycle rear sprocket assembly of claim 1, wherein the total number of one of the at least ten internal spline teeth is equal to or greater than 20. Such as the bicycle rear sprocket assembly of claim 2, wherein the total number of the at least ten internal spline teeth is equal to or greater than 25. For example, the bicycle rear sprocket assembly of claim 1, wherein the at least ten inner spline teeth have a first inner circumferential pitch angle and a second inner circumferential pitch angle different from the first inner circumferential pitch angle. For example, the bicycle rear sprocket assembly of claim 1, wherein the number of the at least one sprocket is 10 or more. For example, the bicycle rear sprocket assembly of claim 1, wherein the number of the at least one sprocket is 11 or more. For example, the bicycle rear sprocket assembly of claim 1, wherein the number of the at least one sprocket is 12 or more. For example, the bicycle rear sprocket assembly of claim 1, wherein the at least one sprocket includes a plurality of sprockets configured to mesh with the bicycle hub assembly, and the plurality of sprockets includes one of the largest having a tooth tip diameter For the sprocket, each of the at least ten internal spline teeth has an internal spline tip diameter, and a ratio of the internal spline tip diameter to the tooth tip diameter is in the range of 0.1 to 0.2. For example, the bicycle rear sprocket assembly of claim 1, wherein the at least one sprocket includes: a first sprocket having a first total number of teeth; and a second sprocket having a smaller number of teeth than the first total number of teeth A second total number of teeth, the first sprocket includes: at least one first displacement promotion area, which is used to promote a bicycle chain from the second chain A first shift operation of the wheel shifted to the first sprocket, and at least one second shift promotion area for promoting the bicycle chain to shift from the first sprocket to one of the second sprocket The second shift operation. For example, the bicycle rear sprocket assembly of claim 1, which further includes a locking member configured to prevent the at least one sprocket mounted on the bicycle hub assembly from being relative to one of the bicycle rear sprocket assembly An axial movement of the central axis of rotation, wherein the locking member includes: a tubular body portion having a central axis; and a protruding portion that is radially directed from the tubular body portion relative to the central axis of the tubular body portion Extending outward, the tubular body portion has an outer threaded portion that is configured to engage with an inner threaded portion of the bicycle hub assembly, and the protruding portion is configured to abut the at least one sprocket. For example, the bicycle rear sprocket assembly of claim 10, wherein the tubular body portion has a first outer diameter equal to or smaller than 26 mm. For example, the bicycle rear sprocket assembly of claim 11, wherein the first outer diameter is equal to or greater than 25mm. For example, the bicycle rear sprocket assembly of claim 10, wherein the protruding part has a second outer diameter equal to or less than 32 mm. For example, the bicycle rear sprocket assembly of claim 13, wherein the second outer diameter is equal to or greater than 30mm. For example, the bicycle rear sprocket assembly of claim 10, wherein the locking member has a tool engagement portion. For example, the bicycle rear sprocket assembly of claim 1, which further includes a sprocket support, wherein the at least one sprocket includes a plurality of sprockets attached to the sprocket support. Such as the bicycle rear sprocket assembly of claim 16, wherein the plurality of sprockets are attached to the sprocket support by an adhesive. For example, the bicycle rear sprocket assembly of claim 16, wherein the sprocket support is made of a non-metallic material including a resin material. For example, the bicycle rear sprocket assembly of claim 1, which further includes a rear hub abutment surface, which is configured to be relative to the bicycle in a state where the bicycle rear sprocket assembly is mounted to the bicycle hub assembly A rotational center axis of the rear sprocket assembly is adjacent to the bicycle hub assembly in an axial direction, wherein the at least one sprocket includes a plurality of sprockets, the plurality of sprockets includes a largest sprocket, and the largest sprocket Has an axial inner surface and one of the axial inner surfaces in the axial direction An axially outer surface on the reverse side, which is closer to the rear hub abutment surface in the axial direction than the axially inner surface, and is defined by the shaft in the axial direction An axial distance between the inward surface and the abutting surface of the rear hub is equal to or greater than 7 mm. For example, the bicycle rear sprocket assembly of claim 19, wherein the axial distance is equal to or greater than 10 mm. A bicycle rear sprocket assembly, comprising: at least one sprocket having a total number of teeth equal to or greater than 15; the at least one sprocket includes at least one internal spline configured to mesh with a bicycle hub assembly Teeth, the at least one internal spline tooth has an internal spline tip diameter equal to or less than 30mm; the at least one internal spline tooth includes a plurality of internal spline teeth, the plurality of internal spline teeth includes a tooth for use during pedaling Transmit a transmission rotational force to a plurality of internal spline transmission surfaces of the bicycle hub assembly, each of the plurality of internal spline transmission surfaces includes a radially outermost edge, a radially innermost edge, and a radial length, It is defined from the radially outermost edge to the radially innermost edge, and the sum of one of the radial lengths of the plurality of internal spline transmission surfaces is equal to or greater than 7 mm. Such as the bicycle rear sprocket assembly of claim 21, where The top diameter of the internal spline is equal to or greater than 25mm. For example, the bicycle rear sprocket assembly of claim 21, wherein the top diameter of the internal spline is equal to or greater than 29mm. For example, the bicycle rear sprocket assembly of claim 21, wherein the at least one internal spline tooth has an internal spline bottom diameter equal to or less than 28 mm. For example, the bicycle rear sprocket assembly of claim 24, wherein the bottom diameter of the internal spline is equal to or greater than 25mm. For example, the bicycle rear sprocket assembly of claim 24, wherein the bottom diameter of the inner spline is equal to or greater than 27mm. For example, the bicycle rear sprocket assembly of claim 21, wherein the sum of the radial lengths is equal to or greater than 10 mm. For example, the bicycle rear sprocket assembly of claim 21, wherein the sum of the radial lengths is equal to or greater than 15mm. For example, the bicycle rear sprocket assembly of claim 21, wherein the number of the at least one sprocket is 10 or more. For example, the bicycle rear sprocket assembly of claim 21, wherein the number of the at least one sprocket is 11 or more. For example, the bicycle rear sprocket assembly of claim 21, wherein the number of the at least one sprocket is 12 or more. For example, the bicycle rear sprocket assembly of claim 21, wherein the at least one sprocket includes a plurality of sprockets, the plurality of sprockets includes one of the largest sprockets having a tooth tip diameter, and the inner spline top diameter is opposite to A ratio of tooth tip diameters is in the range of 0.1 to 0.2. For example, the bicycle rear sprocket assembly of claim 21, wherein the at least one sprocket includes: a first sprocket having a first total number of teeth; and a second sprocket having a smaller number of teeth than the first total number of teeth A second total number of teeth, the first sprocket includes: at least one first displacement promotion area for promoting a first displacement operation of a bicycle chain from the second sprocket to the first sprocket And at least one second displacement promotion area, which is used to promote the bicycle chain from the first sprocket to a second displacement operation of the second sprocket. For example, the bicycle rear sprocket assembly of claim 21, which further includes a locking member configured to prevent the at least one mounted on the bicycle hub assembly An axial movement of a sprocket relative to a rotation center axis of the bicycle rear sprocket assembly, wherein the locking member includes: a tubular body portion having a central axis; and a protruding portion relative to the tubular The central axis of the main body portion extends radially outward from the tubular main body portion, the tubular main body portion having an outer threaded portion configured to engage with an inner threaded portion of the bicycle hub assembly, and the protruding portion It is configured to abut the at least one sprocket. For example, the bicycle rear sprocket assembly of claim 34, wherein the tubular body part has a first outer diameter equal to or smaller than 26 mm. For example, the bicycle rear sprocket assembly of claim 35, wherein the first outer diameter is equal to or greater than 25mm. For example, the bicycle rear sprocket assembly of claim 34, wherein the protruding part has a second outer diameter equal to or less than 32 mm. For example, the bicycle rear sprocket assembly of claim 37, wherein the second outer diameter is equal to or greater than 30mm. For example, the bicycle rear sprocket assembly of claim 34, wherein the locking member has a tool engagement portion. Such as the bicycle rear sprocket assembly of claim 21, which further includes a sprocket support, wherein the at least one sprocket includes a plurality of sprockets attached to the sprocket support. For example, the bicycle rear sprocket assembly of claim 40, wherein the plurality of sprockets are attached to the sprocket support by an adhesive. For example, the bicycle rear sprocket assembly of claim 40, wherein the sprocket support is made of a non-metallic material including a resin material. For example, the bicycle rear sprocket assembly of claim 21, which further includes a rear hub abutment surface, which is configured to be relative to the bicycle in a state where the bicycle rear sprocket assembly is mounted to the bicycle hub assembly A rotational center axis of the rear sprocket assembly is adjacent to the bicycle hub assembly in an axial direction, wherein the at least one sprocket includes a plurality of sprockets, the plurality of sprockets includes a largest sprocket, and the largest sprocket It has an axial inner surface and an axial outer surface arranged on a reverse side of the axial inner surface in the axial direction. Compared with the axial inner surface, the axial outer surface is on the shaft It is closer to the rear hub abutting surface in the axial direction, and an axial distance defined between the axial inner surface and the rear hub abutting surface in the axial direction is equal to or greater than 7 mm. Such as the bicycle rear sprocket assembly of claim 43, where The axial distance is equal to or greater than 10 mm. A bicycle rear sprocket assembly, comprising: a plurality of sprocket wheels, including a largest sprocket, the largest sprocket has an axial inner surface and a center axis of rotation relative to the bicycle rear sprocket assembly An axial outer surface disposed on a reverse side of the axial inner surface in an axial direction; a rear hub abutment surface, which is configured to mount the bicycle rear sprocket assembly to a bicycle hub assembly In a state adjacent to the bicycle hub assembly in the axial direction, the axial outer surface is closer to the rear hub abutting surface in the axial direction than the axial inner surface; and An axial distance defined between the axial inner surface and the abutting surface of the rear hub is equal to or greater than 7 mm. For example, the bicycle rear sprocket assembly of claim 45, wherein the axial distance is equal to or greater than 10 mm. For example, the bicycle rear sprocket assembly of claim 45, wherein in a state where the bicycle rear sprocket assembly is mounted to the bicycle hub assembly, the axial inner surface is positioned as It is closer to an axial center plane of the bicycle hub assembly. For example, the bicycle rear sprocket assembly of claim 45, wherein the total number of one of the plurality of sprockets is 12. For example, the bicycle rear sprocket assembly of claim 45, wherein the total number of teeth of one of the largest sprocket is equal to or greater than 39. For example, the bicycle rear sprocket assembly of claim 45, wherein the total number of teeth of one of the largest sprocket is equal to or greater than 45. A bicycle rear sprocket assembly, comprising: at least one sprocket having a total number of teeth equal to or greater than 15, the at least one sprocket including at least ten internal flowers configured to mesh with a bicycle hub assembly Key teeth; wherein the at least one sprocket includes a plurality of sprockets configured to mesh with the bicycle hub assembly, the plurality of sprockets include one of the largest sprocket having a tooth tip diameter, the at least ten internal flowers Each of the key teeth has an internal spline tip diameter, and the ratio of the internal spline tip diameter to the tooth tip diameter is in the range of 0.1 to 0.2. A bicycle rear sprocket assembly, comprising: at least one sprocket having a total number of teeth equal to or greater than 15, the at least one sprocket including at least ten internal flowers configured to mesh with a bicycle hub assembly Key teeth; the at least one sprocket includes: a first sprocket, which has a first total number of teeth; and a second sprocket, which has a second total number of teeth less than the first total number of teeth, the first chain The wheel includes: at least one first displacement promotion area for promoting a bicycle chain from the second chain A first shift operation of the wheel shifted to the first sprocket, and at least one second shift promotion area for promoting the bicycle chain to shift from the first sprocket to one of the second sprocket The second shift operation. A bicycle rear sprocket assembly, comprising: at least one sprocket having a total number of teeth equal to or greater than 15, the at least one sprocket including at least ten internal flowers configured to mesh with a bicycle hub assembly Key teeth; a locking member configured to prevent the at least one sprocket mounted on the bicycle hub assembly from moving in an axial direction relative to a central axis of rotation of the bicycle rear sprocket assembly, wherein the lock The member includes: a tubular body portion having a central axis; and a protruding portion that extends radially outward from the tubular body portion relative to the central axis of the tubular body portion, the tubular body portion having a shape An outer threaded portion engaged with an inner threaded portion of the bicycle hub assembly, and the protruding portion is configured to abut the at least one sprocket. A bicycle rear sprocket assembly, comprising: at least one sprocket having a total number of teeth equal to or greater than 15; the at least one sprocket includes at least one internal spline configured to mesh with a bicycle hub assembly Teeth, the at least one internal spline tooth has an internal spline tip diameter equal to or less than 30mm; wherein the at least one sprocket includes a plurality of sprockets, and the plurality of sprockets includes a largest sprocket with a tooth tip diameter And The ratio of the inner spline tip diameter to the tooth tip diameter is in the range of 0.1 to 0.2. A bicycle rear sprocket assembly, comprising: at least one sprocket having a total number of teeth equal to or greater than 15; the at least one sprocket includes at least one internal spline configured to mesh with a bicycle hub assembly Teeth, the at least one internal spline tooth has an internal spline top diameter equal to or less than 30mm; wherein the at least one sprocket includes: a first sprocket having a first total number of teeth; and a second sprocket , Which has a second total number of teeth that is less than the first total number of teeth, the first sprocket includes: at least one first displacement promotion area for promoting a bicycle chain to be displaced from the second sprocket to the first A first displacement operation of a sprocket; and at least one second displacement promotion area for promoting the displacement of the bicycle chain from the first sprocket to a second displacement operation of the second sprocket. A bicycle rear sprocket assembly, comprising: at least one sprocket having a total number of teeth equal to or greater than 15; the at least one sprocket includes at least one internal spline configured to mesh with a bicycle hub assembly Teeth, the at least one internal spline tooth has an internal spline top diameter equal to or less than 30mm; a locking member configured to prevent the at least one sprocket mounted on the bicycle hub assembly from relative to the bicycle An axial movement of a central axis of rotation of the rear sprocket assembly, wherein the locking member includes: a tubular body portion having a central axis; and A protruding portion extending radially outward from the tubular body portion relative to the central axis of the tubular body portion, the tubular body portion having a threaded portion configured to engage with an inner threaded portion of the bicycle hub assembly The outer threaded portion, and the protruding portion is configured to abut the at least one sprocket.

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