TWI707800B - Bicycle rear sprocket assembly and bicycle drive train - Google Patents

Abstract

A bicycle rear sprocket assembly comprises at least one sprocket. 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 and bicycle transmission system

The invention relates to a bicycle rear sprocket assembly and a bicycle transmission system.

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. 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 less internal spline teeth, at least + internal spline teeth are less applied to at least + 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 a sprocket including nine or less internal spline teeth, at least twenty internal spline teeth are further reduced to at least twenty The rotational force of each of the 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 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 the 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 at least one of the at least ten internal spline teeth has a different A first spline shape of a second spline shape in the other one of the at least ten internal spline teeth.

In the case of the bicycle rear sprocket assembly according to the fifth aspect, the difference between the first spline shape and the second spline shape helps the user to correctly install the bicycle rear sprocket assembly to the bicycle The wheel hub assembly, especially the circumferential position of each sprocket of the bicycle rear sprocket assembly.

According to the sixth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the fifth aspect is configured such that at least one of the at least ten internal spline teeth has a different A first size that is a second size of the other one of the at least ten internal spline teeth.

In the case of the bicycle rear sprocket assembly according to the sixth aspect, the difference between the first size and the second size helps the user to correctly install the bicycle rear sprocket assembly to the sprocket support body, especially regarding The circumferential position of each sprocket of the bicycle rear sprocket assembly.

According to a seventh aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the sixth aspect is configured such that the at least one sprocket includes a smallest sprocket, the smallest sprocket At least one sprocket tooth is included. The total number of one of the at least one sprocket teeth of the smallest sprocket is 10 or less.

In the case of the bicycle rear sprocket assembly according to the seventh aspect, it is possible to widen the gear range of the bicycle rear sprocket assembly on the high-speed gear side.

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 largest sprocket, the largest sprocket At least one sprocket tooth is included. The total number of one of the at least one sprocket teeth of the largest sprocket is equal to or greater than 46.

In the case of the bicycle rear sprocket assembly according to the eighth aspect, it is possible to widen the gear range of the bicycle rear sprocket assembly on the low-speed gear side.

According to a ninth aspect of the present invention, the bicycle rear sprocket assembly as in the eighth aspect is configured such that the total number of the at least one sprocket of the largest sprocket is equal to or greater than 50.

In the case of the bicycle rear sprocket assembly according to the ninth aspect, it is possible to further widen the gear range of the bicycle rear sprocket assembly.

According to a tenth aspect of the present invention, a bicycle rear sprocket assembly includes at least one sprocket. The at least one sprocket includes a plurality of internal spline teeth that are configured to mesh with a bicycle hub assembly. At least two of the plurality of internal spline teeth are circumferentially arranged at a first internal pitch angle relative to a rotation center axis of the bicycle rear sprocket assembly. The first inner circumferential pitch angle is in the range of 10 degrees to 20 degrees.

In the case of the bicycle rear sprocket assembly according to the tenth aspect, compared to a sprocket including nine or fewer internal spline teeth, the first internal pitch angle reduction is applied to at least ten internal spline teeth The rotational force of each of them. 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 eleventh aspect of the present invention, the bicycle rear sprocket assembly as in the tenth aspect is configured such that the first inner circumferential pitch angle is in the range of 12 to 15 degrees.

In the case of the bicycle rear sprocket assembly according to the eleventh aspect, compared to a sprocket including nine or fewer internal spline teeth, the first internal pitch angle is further reduced to at least ten internal splines. The rotational force of each of the key 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 the twelfth aspect of the present invention, the bicycle rear sprocket assembly as in the eleventh aspect is configured such that the first inner circumferential pitch angle is in the range of 13 to 14 degrees.

In the case of the bicycle rear sprocket assembly according to the twelfth aspect, compared to a sprocket including nine or fewer internal spline teeth, the first internal pitch angle is further reduced to at least ten internal splines. The rotational force of each of the key 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 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 at least two of the plurality of internal spline teeth are internally The spline teeth are arranged along the circumference with a second inner circumferential pitch angle relative to the rotation center axis. The second inner circumferential pitch angle is different from the first inner circumferential pitch angle.

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

According to the fourteenth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the tenth aspect to the thirteenth aspect is configured such that the at least one sprocket includes a smallest sprocket, the smallest The sprocket includes at least one sprocket tooth. The total number of one of the at least one sprocket teeth of the smallest sprocket is 10 or less.

In the case of the bicycle rear sprocket assembly according to the fourteenth aspect, it is possible to widen the gear range of the bicycle rear sprocket assembly on the high-speed gear side.

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 at least one sprocket includes a largest sprocket, the largest The sprocket includes at least one sprocket tooth. The total number of one of the at least one sprocket teeth of the largest sprocket is equal to or greater than 46.

In the case of the bicycle rear sprocket assembly according to the fifteenth aspect, it is possible to widen the gear range of the bicycle rear sprocket assembly on the low-speed gear side.

According to the sixteenth aspect of the present invention, the bicycle rear sprocket assembly as in the fifteenth aspect is configured such that the total number of the at least one sprocket of the largest sprocket is equal to or greater than 50.

In the case of the bicycle rear sprocket assembly according to the sixteenth aspect, it is possible to further increase The gear range of the wide bicycle rear sprocket assembly.

According to a seventeenth aspect of the present invention, a bicycle rear sprocket assembly includes at least one sprocket. 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 seventeenth 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 gear range of the rear sprocket assembly of the bicycle on the high-speed gear side.

According to the eighteenth aspect of the present invention, the bicycle rear sprocket assembly as in the seventeenth aspect is configured such that the top diameter of the inner spline is equal to or greater than 25 mm.

In the case of the bicycle rear sprocket assembly according to the eighteenth 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 nineteenth aspect of the present invention, the bicycle rear sprocket assembly as in the eighteenth 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 nineteenth 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 twentieth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the seventeenth aspect to the nineteenth aspect is configured such that the at least one internal spline tooth has 28 mm or less One of the inner spline bottom diameter.

In the case of the bicycle rear sprocket assembly according to the twentieth 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 improvement at least one sprocket strength.

According to the twenty-first aspect of the present invention, the bicycle rear sprocket assembly as in any one of the seventeenth aspect to the twentieth 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-first 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-second aspect of the present invention, the bicycle rear sprocket assembly as in the twenty-first 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-second 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-third aspect of the present invention, the bicycle rear sprocket assembly as in any one of the seventeenth aspect to the twenty-second 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 including a plurality of internal spline transmission surfaces for receiving a transmission rotational force from one of 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 of the plurality of internal spline transmission surfaces is equal to or greater than 7 mm.

In the case of the bicycle rear sprocket assembly according to the twenty-third 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-fourth aspect of the present invention, the bicycle rear sprocket assembly as in the twenty-third 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-fourth aspect, it is possible to further Increase the radial length of multiple internal spline transmission surfaces. 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-third 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-fifth aspect, it is possible to further increase the radial length of the plurality of internal spline transmission surfaces. This further improves the strength of at least one sprocket.

According to the twenty-sixth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the seventeenth aspect to the twenty-fifth aspect is configured such that the at least one sprocket includes a smallest sprocket , The smallest sprocket includes at least one sprocket tooth. The total number of one of the at least one sprocket teeth of the smallest sprocket is 10 or less.

In the case of the bicycle rear sprocket assembly according to the twenty-sixth aspect, it is possible to widen 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 as in any one of the seventeenth aspect to the twenty-sixth aspect is configured such that the at least one sprocket includes a largest sprocket , The largest sprocket includes at least one sprocket tooth. The total number of one of the at least one sprocket teeth of the largest sprocket is equal to or greater than 46.

In the case of the bicycle rear sprocket assembly according to the twenty-seventh aspect, it is possible to widen the gear range of the bicycle rear sprocket assembly on the low-speed gear side.

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 total number of the at least one sprocket of the largest sprocket is equal to or greater than 50.

In the case of the bicycle rear sprocket assembly according to the twenty-eighth aspect, it is possible to further widen the gear range of the bicycle rear sprocket assembly.

According to a twenty-ninth aspect of the present invention, a bicycle rear sprocket assembly includes at least one Sprocket. 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 includes an internal spline transmission surface and an internal spline non-transmission surface. The inner spline transmission surface has a first inner spline surface angle defined between the inner spline transmission surface and a first radial line from one of the bicycle rear sprocket assembly The central axis of rotation extends to the radially outermost edge of one of the internal spline transmission surfaces. The internal spline non-transmission surface has a second internal spline surface angle defined between the internal spline non-transmission surface and a second radial line from the bicycle rear sprocket assembly The rotation center axis extends to the radially outermost edge of a non-transmission surface of the inner spline. The second internal spline surface angle is different from the first internal spline surface angle.

In the case of the bicycle rear sprocket assembly according to the twenty-ninth aspect, it is possible to reduce the weight of at least one sprocket while ensuring the strength of at least one internal spline tooth of the at least one sprocket.

According to the thirtieth aspect of the present invention, the bicycle rear sprocket assembly as in the twenty-ninth aspect is configured such that the first inner spline surface angle is smaller than the second inner spline surface angle.

In the case of the bicycle rear sprocket assembly according to the thirtieth aspect, it is possible to effectively reduce the weight of at least one sprocket while ensuring the strength of at least one internal spline tooth of the at least one sprocket.

According to the thirty-first aspect of the present invention, the bicycle rear sprocket assembly, such as the twenty-ninth aspect or the thirtieth aspect, is configured such that the surface angle of the first internal spline is between 0° and 10° Within the range.

In the case of the bicycle rear sprocket assembly according to the thirty-first aspect, the first inner spline surface angle ensures the strength of the inner spline transmission surface.

According to the thirty-second aspect of the present invention, such as any of the twenty-ninth aspect to the thirty-first aspect A bicycle rear sprocket assembly is configured such that the surface angle of the second internal spline is in the range of 0 degrees to 60 degrees.

In the case of the bicycle rear sprocket assembly according to the thirty-second aspect, the second inner spline surface angle reduces the weight of at least one sprocket.

According to the thirty-third aspect of the present invention, the bicycle rear sprocket assembly, such as any one of the twenty-ninth aspect to the thirty-second aspect, is configured such that the at least one sprocket includes a smallest chain Wheel, the smallest sprocket includes at least one sprocket tooth. The total number of one of the at least one sprocket teeth of the smallest sprocket is 10 or less.

In the case of the bicycle rear sprocket assembly according to the thirty-third aspect, it is possible to widen the gear range of the bicycle rear sprocket assembly on the high-speed gear side.

According to the thirty-fourth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the twenty-ninth aspect to the thirty-third aspect is configured such that the at least one sprocket includes a largest chain Wheel, the largest sprocket includes at least one sprocket tooth. The total number of one of the at least one sprocket teeth of the largest sprocket is equal to or greater than 46.

In the case of the bicycle rear sprocket assembly according to the thirty-fourth aspect, it is possible to widen the gear range of the bicycle rear sprocket assembly on the low-speed gear side.

According to the thirty-fifth aspect of the present invention, the bicycle rear sprocket assembly as in the thirty-fourth aspect is configured such that the total number of the at least one sprocket of the largest sprocket is equal to or greater than 50.

In the case of the bicycle rear sprocket assembly according to the thirty-fifth aspect, it is possible to further widen the gear range of the bicycle rear sprocket assembly.

According to a thirty-sixth aspect of the present invention, a bicycle transmission system includes the bicycle rear sprocket assembly and a bicycle hub assembly as in any one of the first aspect to the ninth aspect. The bicycle hub assembly includes a sprocket, and the sprocket support body includes a sprocket configured to be integrated with the bicycle rear sprocket. At least ten external spline teeth in mesh. Each of the at least ten external spline teeth has an external spline transmission surface and an external spline non-transmission surface.

In the case of the bicycle transmission system according to the thirty-sixth aspect, compared to a sprocket including nine or less 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 them. 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. In addition, the at least ten external spline teeth reduce the rotational force applied to each of the at least ten external spline teeth compared to the sprocket support body including nine or less external spline teeth. This improved durability of the sprocket support body and/or improved the degree of freedom in selecting the material of the sprocket support body without reducing the durability of the sprocket support body.

According to the thirty-seventh aspect of the present invention, a bicycle transmission system includes the bicycle rear sprocket assembly and a bicycle hub assembly as in any one of the tenth aspect to the sixteenth aspect. The bicycle hub assembly includes a sprocket support body that includes a plurality of external spline teeth that are configured to mesh with the bicycle rear sprocket assembly. At least two of the plurality of external spline teeth are circumferentially arranged at a first external pitch angle relative to a rotation center axis of the bicycle hub assembly. The first outer circumferential pitch angle is in the range of 10 degrees to 20 degrees.

In the case of the bicycle transmission system according to the thirty-seventh aspect, compared to a sprocket including nine or less internal spline teeth, the first internal pitch angle reduction is applied to at least ten internal spline teeth The rotational force of each of them. This 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. In addition, the at least ten external spline teeth reduce the rotational force applied to each of the at least ten external spline teeth compared to the sprocket support body including nine or less external spline teeth. This improved durability of the sprocket support body and/or improved the degree of freedom in selecting the material of the sprocket support body without reducing the sprocket support The durability of the main body.

According to a thirty-eighth aspect of the present invention, a bicycle transmission system includes the bicycle rear sprocket assembly and a bicycle hub assembly as in any one of the seventeenth aspect to the twenty-eighth aspect. The bicycle hub assembly includes a sprocket support body including at least one external spline tooth configured to mesh with the bicycle rear sprocket assembly. The at least one external spline tooth has an external spline top diameter equal to or less than 30 mm.

In the case of the bicycle transmission system according to the thirty-eighth aspect, it is possible to manufacture a bicycle rear sprocket with a total number of teeth equal to or less than ten. Therefore, it is possible to widen the gear range of the bicycle transmission system.

According to the thirty-ninth aspect of the present invention, a bicycle transmission system includes the bicycle rear sprocket assembly and a bicycle hub assembly as in any one of the twenty-ninth aspect to the thirty-fifth aspect. The bicycle hub assembly includes a sprocket support body that includes at least nine external spline teeth that are configured to mesh with the bicycle rear sprocket assembly. At least one of the at least nine external spline teeth has an asymmetrical shape with respect to a circumferential tooth tip centerline. The at least one of the at least nine external spline teeth includes an external spline transmission surface and an external spline non-transmission surface. The outer spline transmission surface has a first outer spline surface angle defined between the outer spline transmission surface and a first radial line from a rotation center of the bicycle hub assembly The axis extends to the radially outermost edge of one of the outer spline transmission surfaces. The outer spline non-transmission surface has a second outer spline surface angle defined between the outer spline non-transmission surface and a second radial line from the bicycle hub assembly The central axis of rotation extends to the radially outermost edge of one of the outer spline non-transmission surfaces. The second outer spline surface angle is different from the first outer spline surface angle.

In the case of the bicycle transmission system according to the thirty-ninth aspect, it is possible to reduce The weight of the bicycle transmission system, while ensuring the strength of the bicycle transmission system.

According to the fortieth aspect of the present invention, the bicycle rear sprocket assembly as in any one of the first aspect to the ninth aspect is configured such that the at least ten internal spline teeth have a diameter equal to or greater than 25mm An internal spline top diameter.

In the case of the bicycle rear sprocket assembly according to the fortieth aspect, it is possible to ensure the strength of at least one sprocket.

According to the forty-first aspect of the present invention, the bicycle rear sprocket assembly of the fortieth aspect is configured such that the top diameter of the internal spline is equal to or greater than 29 mm.

In the case of the bicycle rear sprocket assembly according to the 41st aspect, it is possible to further ensure the strength of at least one sprocket.

According to the forty-second aspect of the present invention, the bicycle rear sprocket assembly, such as any one of the first aspect to the ninth aspect, the fortieth aspect, and the forty-first aspect, is configured such that The at least ten internal spline teeth have an internal spline bottom diameter equal to or greater than 25 mm.

In the case of the bicycle rear sprocket assembly according to the forty-second aspect, it is possible to ensure the strength of at least one sprocket.

According to the forty-third aspect of the present invention, the bicycle rear sprocket assembly as in the forty-second 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 forty-third aspect, it is possible to surely ensure the strength of at least one sprocket.

According to the forty-fourth aspect of the present invention, the bicycle rear sprocket assembly, such as any one of the first aspect to the ninth aspect and the forty aspect to the forty-third aspect, is configured such that The at least ten internal spline teeth include a plurality of internal spline transmission surfaces for receiving a transmission rotational force from one of the bicycle hub assembly during pedaling. Each of the plurality of internal spline transmission surfaces includes a radial The 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 of the plurality of internal spline transmission surfaces is equal to or greater than 7 mm.

In the case of the bicycle rear sprocket assembly according to the forty-fourth 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 forty-fifth aspect of the present invention, the bicycle rear sprocket assembly of the forty-fourth 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 forty-fifth 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 forty-sixth aspect of the present invention, the bicycle rear sprocket assembly of the forty-fourth 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 46th aspect, it is possible to further increase the radial length of the plurality of internal spline transmission surfaces. This further improves the strength of at least one sprocket.

According to the forty-seventh aspect of the present invention, the bicycle rear sprocket assembly, such as any one of the first aspect to the ninth aspect and the forty aspect to the forty-sixth aspect, is configured such that At least two of the at least ten internal spline teeth are circumferentially arranged at a first internal pitch angle relative to a rotation center axis of the bicycle rear sprocket assembly. The first inner circumferential pitch angle is in the range of 10 degrees to 20 degrees.

In the case of the bicycle transmission system according to the forty-seventh aspect, compared to a sprocket including nine or less internal spline teeth, the first internal pitch angle reduction is applied to at least ten internal spline teeth The rotational force of each of them. 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. In addition, compared to In the sprocket support body including nine or less external spline teeth, at least ten external spline teeth reduce the rotational force applied to each of the at least ten external spline teeth. This improved durability of the sprocket support body and/or improved the degree of freedom in selecting the material of the sprocket support body without reducing the durability of the sprocket support body.

According to the forty-eighth aspect of the present invention, the bicycle rear sprocket assembly of the forty-seventh aspect is configured such that the first inner circumferential pitch angle is in the range of 12 to 15 degrees.

In the case of the bicycle rear sprocket assembly according to the forty-eighth aspect, compared to a sprocket including nine or fewer internal spline teeth, the first internal pitch angle is further reduced to at least ten internal The rotational force of each of the 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 the forty-ninth aspect of the present invention, the bicycle rear sprocket assembly as in the forty-seventh aspect is configured such that the first inner circumferential pitch angle is in the range of 13 degrees to 14 degrees.

In the case of the bicycle rear sprocket assembly according to the forty-ninth aspect, compared to a sprocket including nine or fewer internal spline teeth, the first internal pitch angle is further reduced to at least ten internal The rotational force of each of the 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 the fiftieth aspect of the present invention, the bicycle rear sprocket assembly of the forty-seventh aspect is configured such that at least two of the at least ten internal spline teeth rotate relative to the The central axis is arranged along the circumference with a second inner circumferential pitch angle. The second inner circumferential pitch angle is different from the first inner circumferential pitch angle.

In the case of the bicycle rear sprocket assembly according to the fiftieth aspect, the first inner circumferential pitch angle The difference with the second inner circumferential pitch angle helps the user to correctly install the bicycle rear sprocket assembly to the bicycle hub assembly, especially regarding the circumferential position of each sprocket of the bicycle rear sprocket assembly.

According to the fifty-first aspect of the present invention, the bicycle rear sprocket assembly, such as any one of the first aspect to the ninth aspect and the fortieth aspect to the fiftieth aspect, is configured so that the At least ten internal spline teeth include an internal spline transmission surface and an internal spline non-transmission surface. The inner spline transmission surface has a first inner spline surface angle defined between the inner spline transmission surface and a first radial line from one of the bicycle rear sprocket assembly The central axis of rotation extends to the radially outermost edge of one of the internal spline transmission surfaces. The internal spline non-transmission surface has a second internal spline surface angle defined between the internal spline non-transmission surface and a second radial line from the bicycle rear sprocket assembly The rotation center axis extends to the radially outermost edge of a non-transmission surface of the inner spline. The second internal spline surface angle is different from the first internal spline surface angle.

In the case of the bicycle rear sprocket assembly according to the fifty-first aspect, it is possible to reduce the weight of at least one sprocket while ensuring the strength of at least one internal spline tooth of the at least one sprocket.

According to the fifty-second aspect of the present invention, the bicycle rear sprocket assembly as in the fifty-first aspect is configured such that the first inner spline surface angle is smaller than the second inner spline surface angle.

In the case of the bicycle rear sprocket assembly according to the fifty-second aspect, it is possible to effectively reduce the weight of at least one sprocket while ensuring the strength of at least one internal spline tooth of the at least one sprocket.

According to the fifty-third aspect of the present invention, the bicycle rear sprocket assembly as in the fifty-first aspect is configured such that the surface angle of the first internal spline is in the range of 0 degrees to 10 degrees.

In the case of the bicycle rear sprocket assembly according to the fifty-third aspect, the first inner spline surface angle ensures the strength of the inner spline transmission surface.

According to the fifty-fourth aspect of the present invention, the bicycle rear sprocket assembly as in the fifty-first aspect is configured such that the surface angle of the second inner spline is in the range of 0 degrees to 60 degrees.

In the case of the bicycle rear sprocket assembly according to the fifty-fourth aspect, the second inner spline surface angle reduces the weight of at least one sprocket.

According to the fifty-fifth aspect of the present invention, the bicycle rear sprocket assembly of any one of the first aspect to the ninth aspect and the fortieth aspect to the fifty-fourth aspect further includes the at least one One of the sprocket supports is attached to the sprocket.

According to the fifty-sixth aspect of the present invention, the bicycle rear sprocket assembly of the fifty-fifth aspect is configured such that the sprocket support is made of a non-metallic material including a resin material.

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: lock ring

32A: External threaded part

32B: Locking flange

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

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

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

A1: Rotation center axis

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

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

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: Extra 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

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;

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

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;

The embodiments will now be described with reference to the drawings, in which like reference numerals designate corresponding or identical elements in the various drawings.

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 the user who is based on the seat of the bicycle (not shown) and facing the handlebar (not shown) (For example, riders) and determine their direction. 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 ). The bicycle rear sprocket assembly 14 is configured to mesh with the bicycle chain 20 so as to transmit the driving 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 hub assembly 12 includes a lock ring 32. The lock ring 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 Figure 4, the bicycle hub assembly 12 is fastened to the bicycle by the wheel fastening structure WS. Car frame BF. 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 FIGS. 4 and 5, the bicycle hub assembly 12 further includes a brake rotor support body 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 lock ring 32 includes an outer threaded portion 32A. The sprocket support body 28 includes an inner threaded portion 28A. In the state where the lock ring 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 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 are provided between the sprocket support body 28 and the hub axle 30 to rotatably support the sprocket support body 28 with respect 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). Sprocket The support body 28 includes at least ten external spline teeth 40 that are configured to mesh with the bicycle rear sprocket assembly 14 (Figure 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 locking flange 32B of the locking ring 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 outer 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 outer spline teeth 40 have spline sizes that are substantially the same as 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 circumferential width MW1 is defined as the maximum width for receiving the thrust F2 applied to the external spline teeth 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 outer spline tooth 40 has an outer spline tooth root circle RC12, and the outer spline tooth root circle RC12 has an outer 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 radial length RL11, etc. Less than 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 an additional radial length RL12. The additional radial length RL12 is respectively defined from the outer spline tooth root circle RC12 to the radially outermost end 40A of the plurality of outer spline teeth 40. The sum of the extra radial length RL12 is equal to or greater than 12mm. In this embodiment, the sum of the additional radial length RL12 is 31.85 mm. However, the sum of the additional 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 the 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 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 the smallest sprocket SP1 and the largest sprocket SP12. 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. 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 smallest sprocket SP1 is at least The total number of one sprocket SP1B 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 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 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. The total number of sprocket teeth of each of the sprockets SP2 to SP11 is not limited to this embodiment.

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 includes a sprocket support 56, a plurality of spacers 58, a first Ring 59A and second ring 59B. In the illustrated embodiment, the sprockets SP1 to SP12 are attached to the sprocket support 56.

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 SPSA. 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 first 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 engagement 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 locking flange 32B of the lock ring 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. Each of the sprocket support 56, the first spacer 58A to the seventh spacer 58G, the first ring 59A and the second ring 59B is made of a non-metallic material such as a resin material. 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 within the second internal spline teeth relative to the central axis of rotation A1 The peripheral pitch angle PA22 is arranged along the circumference. In this embodiment, the second inner circumferential pitch angle PA22 is different from the first inner circumferential pitch 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. At least one internal spline tooth 64 includes a plurality of internal spline teeth 64. The plurality of internal spline teeth 64 includes a plurality of internal spline transmission surfaces 66 for receiving the transmission rotational force F1 from the bicycle hub assembly 12 (FIG. 6) during pedaling. 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 circumference is the largest The sum of the 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 29.8 mm. However, the inner spline top diameter DM21 is not limited to this embodiment and 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. The additional radial length RL22 is respectively 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 extra radial length RL22 is not limited In this embodiment and above.

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 Figure 30, the internal spline teeth 64 mesh with the external spline teeth 40 to transmit the rotational force F1 is transmitted 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.

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" itself Does not imply the existence of the "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

XXIII-XXIII‧‧‧line

Claims (54)

A bicycle rear sprocket assembly, comprising: at least one sprocket including at least ten internal spline teeth configured to mesh with a bicycle hub assembly, the at least ten internal spline teeth having a first The 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 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 at least one of the at least ten internal spline teeth has a shape that is different from the shape of another one of the at least ten internal spline teeth. For example, the bicycle rear sprocket assembly of claim 1, wherein at least one of the at least ten internal spline teeth has a second spline size different from the other of the at least ten internal spline teeth A size of the first spline. Such as the bicycle rear sprocket assembly of claim 1, where The at least one sprocket includes a smallest sprocket, the smallest sprocket includes at least one sprocket, and the total number of the at least one sprocket of the smallest sprocket is equal to or less than 10. For example, the bicycle rear sprocket assembly of claim 1, wherein the at least one sprocket includes a largest sprocket, the largest sprocket includes at least one sprocket, and the total number of one of the at least one sprocket of the largest sprocket The mesh is equal to or greater than 46. Such as the bicycle rear sprocket assembly of claim 7, wherein the total number of the at least one sprocket of the largest sprocket is equal to or greater than 50. A bicycle rear sprocket assembly, comprising: at least one sprocket including a plurality of internal spline teeth configured to mesh with a bicycle hub assembly, and at least two of the plurality of internal spline teeth The spline teeth are arranged circumferentially with a first inner circumferential pitch angle relative to a rotation center axis of the bicycle rear sprocket assembly, and the first inner circumferential pitch angle is in the range of 10 degrees to 20 degrees. For example, the bicycle rear sprocket assembly of claim 9, wherein the first inner circumferential pitch angle is in the range of 12 degrees to 15 degrees. For example, the bicycle rear sprocket assembly of claim 10, wherein the first inner circumferential pitch angle is in the range of 13 degrees to 14 degrees. For example, the bicycle rear sprocket assembly of claim 9, wherein at least two of the plurality of internal spline teeth are arranged along the circumference at a second internal pitch angle relative to the rotation center axis, and the first The second inner circumferential pitch angle is different from the first inner circumferential pitch angle. For example, the bicycle rear sprocket assembly of claim 9, wherein the at least one sprocket includes a smallest sprocket, the smallest sprocket includes at least one sprocket, and a total of one of the at least one sprocket of the smallest sprocket The mesh is equal to or less than 10. For example, the bicycle rear sprocket assembly of claim 9, wherein the at least one sprocket includes a largest sprocket, the largest sprocket includes at least one sprocket, and the total number of one of the at least one sprocket of the largest sprocket The mesh is equal to or greater than 46. Such as the bicycle rear sprocket assembly of claim 14, wherein the total number of the at least one sprocket of the largest sprocket is equal to or greater than 50. A bicycle rear sprocket assembly, comprising: at least one sprocket including at least one internal spline tooth configured to mesh with a bicycle hub assembly, the at least one internal spline tooth having an internal diameter equal to or less than 30 mm Top diameter of spline. For example, the bicycle rear sprocket assembly of claim 16, wherein the top diameter of the internal spline is equal to or greater than 25mm. For example, the bicycle rear sprocket assembly of claim 17, wherein the top diameter of the internal spline is equal to or greater than 29mm. For example, the bicycle rear sprocket assembly of claim 16, 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 19, wherein the bottom diameter of the internal spline is equal to or greater than 25mm. For example, the bicycle rear sprocket assembly of claim 20, wherein the bottom diameter of the inner spline is equal to or greater than 27mm. For example, the bicycle rear sprocket assembly of claim 16, wherein the at least one internal spline tooth includes a plurality of internal spline teeth, and the plurality of internal spline teeth includes one for receiving from the bicycle hub assembly during pedaling A plurality of internal spline transmission surfaces that transmit rotational force, each of the plurality of internal 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, 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 22, wherein the sum of the radial lengths is equal to or greater than 10 mm. Such as the bicycle rear sprocket assembly of claim 22, wherein the sum of the radial lengths is equal to or greater than 15mm. For example, the bicycle rear sprocket assembly of claim 16, wherein the at least one sprocket includes a smallest sprocket, the smallest sprocket includes at least one sprocket, and the smallest sprocket has a total of one of the at least one sprocket teeth The mesh is equal to or less than 10. For example, the bicycle rear sprocket assembly of claim 16, wherein the at least one sprocket includes a largest sprocket, the largest sprocket includes at least one sprocket, and the total number of one of the at least one sprocket of the largest sprocket The mesh is equal to or greater than 46. For example, the bicycle rear sprocket assembly of claim 26, wherein the total number of the at least one sprocket of the largest sprocket is equal to or greater than 50. A bicycle rear sprocket assembly, comprising: at least one sprocket including at least one internal spline tooth configured to mesh with a bicycle hub assembly, the at least one internal spline tooth including: an internal spline A transmission surface having a first inner spline surface angle defined between the inner spline transmission surface and a first radial line from a rotation center of the bicycle rear sprocket assembly The axis extends to a radially outermost edge of the internal spline transmission surface; and an internal spline non-transmission surface having a second radial line defined between the internal spline non-transmission surface and a second radial line The inner spline surface angle, the second radial line extends from the rotation center axis of the bicycle rear sprocket assembly to the radially outermost edge of one of the inner spline non-transmission surfaces, the second inner spline surface angle Different from the first internal spline surface angle, the second internal spline surface angle is in the range of 0 degrees to 60 degrees. For example, the bicycle rear sprocket assembly of claim 28, wherein the first inner spline surface angle is smaller than the second inner spline surface angle. For example, the bicycle rear sprocket assembly of claim 28, wherein the first inner spline surface angle is in the range of 0 degrees to 10 degrees. For example, the bicycle rear sprocket assembly of claim 28, wherein the at least one sprocket includes a smallest sprocket, the smallest sprocket includes at least one sprocket, and the smallest sprocket has a total of one of the at least one sprocket teeth The mesh is equal to or less than 10. For example, the bicycle rear sprocket assembly of claim 28, wherein the at least one sprocket includes a largest sprocket, the largest sprocket includes at least one sprocket, and the total number of one of the at least one sprocket of the largest sprocket The mesh is equal to or greater than 46. For example, the bicycle rear sprocket assembly of claim 32, wherein the total number of the at least one sprocket of the largest sprocket is equal to or greater than 50. A bicycle transmission system, comprising: the bicycle rear sprocket assembly as in claim 1; and the bicycle hub assembly, which includes a sprocket support body, the sprocket support body includes a sprocket support body that is configured to interact with the bicycle rear chain At least ten external spline teeth meshed by the wheel assembly, each of the at least ten external spline teeth has an external spline transmission surface and an external spline non-transmission surface. A bicycle transmission system, comprising: the bicycle rear sprocket assembly as in claim 9; and the bicycle hub assembly, which includes a sprocket support body, the sprocket support body includes a sprocket support body that is configured to interact with the bicycle rear chain The plurality of external spline teeth engaged by the wheel assembly, and at least two of the plurality of external spline teeth are along the circumference at a first external pitch angle relative to a rotation center axis of the bicycle hub assembly Configuration, the first outer circumferential pitch angle is in the range of 10 degrees to 20 degrees. A bicycle transmission system, comprising: a bicycle rear sprocket assembly as in claim 16; and the bicycle hub assembly, which includes a sprocket support body, the sprocket support body includes a sprocket support body that is configured to interact with the bicycle rear chain The wheel assembly engages at least one external spline tooth, and the at least one external spline tooth has an external spline top diameter equal to or less than 30 mm. A bicycle transmission system, comprising: a bicycle rear sprocket assembly as in claim 28; and the bicycle hub assembly, which includes a sprocket support body, the sprocket support body includes a sprocket support body that is configured to interact with the bicycle rear chain At least nine external spline teeth meshed by the wheel assembly, at least one of the at least nine external spline teeth has an asymmetrical shape with respect to a circumferential tooth tip centerline, and one of the at least nine external spline teeth The at least one includes: an outer spline transmission surface having a first outer spline surface angle defined between the outer spline transmission surface and a first radial line, the first radial line from the A rotation center axis of the bicycle hub assembly extends to a radially outermost edge of the outer spline transmission surface; and an outer spline non-transmission surface having a second diameter defined on the outer spline non-transmission surface A second outer spline surface angle between the radial lines, the second radial line extending from the rotation center axis of the bicycle hub assembly to the radially outermost edge of a non-transmission surface of the outer spline, the first The surface angle of the second outer spline is different from the surface angle of the first outer spline. For example, the bicycle rear sprocket assembly of claim 1, wherein the at least ten internal spline teeth have an internal spline top diameter equal to or greater than 25 mm. For example, the bicycle rear sprocket assembly of claim 38, wherein the top diameter of the internal spline is equal to or greater than 29mm. For example, the bicycle rear sprocket assembly of claim 1, wherein the at least ten internal spline teeth have an internal spline bottom diameter equal to or greater than 25mm. For example, the bicycle rear sprocket assembly of claim 40, wherein the bottom diameter of the inner spline is equal to or greater than 27mm. For example, the bicycle rear sprocket assembly of claim 1, wherein the at least ten internal spline teeth include a plurality of internal spline transmission surfaces for receiving a transmission rotational force from one of the bicycle hub assembly during pedaling, the plurality Each of the 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, and the plurality of inner The sum of one of the radial lengths of the spline transmission surface is equal to or greater than 7mm. Such as the bicycle rear sprocket assembly of claim 42, where The sum of the radial lengths is equal to or greater than 10 mm. Such as the bicycle rear sprocket assembly of claim 42, wherein the sum of the radial lengths is equal to or greater than 15mm. For example, the bicycle rear sprocket assembly of claim 1, wherein at least two of the at least ten internal spline teeth have a first inner circumference relative to a rotation center axis of the bicycle rear sprocket assembly The pitch angle is arranged along the circumference, and the first inner circumferential pitch angle is in the range of 10 degrees to 20 degrees. For example, the bicycle rear sprocket assembly of claim 45, wherein the first inner circumferential pitch angle is in the range of 12 degrees to 15 degrees. For example, the bicycle rear sprocket assembly of claim 45, wherein the first inner circumferential pitch angle is in the range of 13 degrees to 14 degrees. For example, the bicycle rear sprocket assembly of claim 45, wherein at least two of the at least ten internal spline teeth are arranged along the circumference at a second internal pitch angle relative to the rotation center axis, and the The second inner circumferential pitch angle is different from the first inner circumferential pitch angle. For example, the bicycle rear sprocket assembly of claim 1, wherein the at least ten internal spline teeth include: An internal spline transmission surface having a first internal spline surface angle defined between the internal spline transmission surface and a first radial line from the bicycle rear sprocket assembly A rotation center axis extends to a radially outermost edge of the internal spline transmission surface; and an internal spline non-transmission surface having a second radial line defined between the internal spline non-transmission surface A second inner spline surface angle, the second radial line extends from the rotation center axis of the bicycle rear sprocket assembly to a radially outermost edge of the inner spline non-transmission surface, the second inner The spline surface angle is different from the first inner spline surface angle. For example, the bicycle rear sprocket assembly of claim 49, wherein the first inner spline surface angle is smaller than the second inner spline surface angle. For example, the bicycle rear sprocket assembly of claim 49, wherein the surface angle of the first inner spline is in the range of 0 degrees to 10 degrees. For example, the bicycle rear sprocket assembly of claim 49, wherein the surface angle of the second internal spline is in the range of 0 degrees to 60 degrees. Such as the bicycle rear sprocket assembly of claim 1, which further includes a sprocket support, and the at least one sprocket is attached to the sprocket support. For example, the bicycle rear sprocket assembly of claim 53, wherein the sprocket support is made of a non-metallic material including a resin material.

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