Bicycle sprocket assembly and bicycle rear sprocket assembly

1. A bicycle sprocket assembly having a rotational center axis, the bicycle sprocket assembly comprising:

a first sprocket including a first sprocket body and a first chain-engagement structure configured to engage with a bicycle chain, the first sprocket body having a first hub engagement profile configured to engage with a bicycle hub assembly;

a second sprocket including a second sprocket body and a second chain-engagement structure configured to engage with the bicycle chain, the second sprocket body having a second hub engagement profile configured to engage with the bicycle hub assembly;

a first intervening member positioned between the first sprocket and the second sprocket in an axial direction parallel to the rotational center axis; and

a second intervening member positioned between the first sprocket and the second sprocket in the axial direction, the second intervening member being provided radially outwardly from the first intervening member with respect to the rotational center axis, the second intervening member being attached to at least one of the first sprocket and the second sprocket and having an elongated shape extending along a first reference plane perpendicular to the rotational center axis, the second intervening member including

a radial thickness defined in a radial direction with respect to the rotational center axis, and

a circumferential length defined in a circumferential direction of the bicycle sprocket assembly, the circumferential length being longer than the radial thickness to provide the elongated shape.

2. The bicycle sprocket assembly according to claim 1 , wherein

the first intervening member has an annular shape.

3. The bicycle sprocket assembly according to claim 1 , wherein

the first intervening member is a separate member from the second intervening member.

4. The bicycle sprocket assembly according to claim 1 , wherein

the first sprocket is adjacent to the second sprocket without another sprocket intervening between the first sprocket and the second sprocket in the axial direction.

5. The bicycle sprocket assembly according to claim 1 , wherein

the first intervening member has a hub engagement profile configured to engage with the bicycle hub assembly.

6. The bicycle sprocket assembly according to claim 1 , wherein

the first intervening member and the second intervening member are spaced apart from each other in a radial direction with respect to the rotational center axis.

7. The bicycle sprocket assembly according to claim 1 , wherein

the first intervening member is attached to at least one of the first sprocket and the second sprocket by adhesive, and

the second intervening member is attached to at least one of the first sprocket and the second sprocket by adhesive.

8. The bicycle sprocket assembly according to claim 1 , wherein

the first intervening member is attached to at least one of the first sprocket and the second sprocket by diffusion bonding, and

the second intervening member is attached to at least one of the first sprocket and the second sprocket by diffusion bonding.

9. The bicycle sprocket assembly according to claim 1 , wherein

the first chain-engagement structure includes a plurality of first teeth having a first total number,

the second chain-engagement structure includes a plurality of second teeth having a second total number, and

the first total number is larger than the second total number.

10. The bicycle sprocket assembly according to claim 1 , wherein

the first chain-engagement structure includes

a first annular member, and

a plurality of first teeth circumferentially arranged on an outer periphery of the first annular member,

the first annular member and the plurality of first teeth are made of a metallic material, and

the first sprocket body is made of a non-metallic material.

11. The bicycle sprocket assembly according to claim 10 , wherein

the first sprocket body is made of a resin material.

12. The bicycle sprocket assembly according to claim 10 , wherein

the first annular member is attached to the first sprocket body by integral molding.

13. The bicycle sprocket assembly according to claim 10 , wherein

the first annular member is attached to the first sprocket body by adhesive.

14. The bicycle sprocket assembly according to claim 1 , wherein

the second intervening member is integral with one of the first sprocket and the second sprocket as a single unitary member.

15. The bicycle sprocket assembly according to claim 1 , wherein

the second intervening member is attached to the first sprocket and the second sprocket.

16. The bicycle sprocket assembly according to claim 1 , further comprising:

a third sprocket including a third sprocket body and a third chain-engagement structure configured to engage with the bicycle chain, the third sprocket body having a third hub engagement profile configured to engage with the bicycle hub assembly, the second sprocket being positioned between the first sprocket and the third sprocket in the axial direction;

a third intervening member positioned between the second sprocket and the third sprocket in the axial direction; and

a fourth intervening member positioned between the second sprocket and the third sprocket in the axial direction, the fourth intervening member being provided radially outwardly from the third intervening member with respect to the rotational center axis, wherein

the fourth intervening member is attached to at least one of the second sprocket and the third sprocket.

17. The bicycle sprocket assembly according to claim 16 , wherein

the fourth intervening member having an elongated shape extending along a second reference plane perpendicular to the rotational center axis.

18. The bicycle sprocket assembly according to claim 16 , wherein

the third intervening member has an annular shape.

19. The bicycle sprocket assembly according to claim 16 , wherein

the third intervening member is a separate member from the fourth intervening member.

20. The bicycle sprocket assembly according to claim 16 , wherein

the second sprocket is adjacent to the third sprocket without another sprocket intervening between the second sprocket and the third sprocket in the axial direction.

21. The bicycle sprocket assembly according to claim 16 , wherein

the fourth intervening member is attached to the second sprocket and the third sprocket.

22. The bicycle sprocket assembly according to claim 16 , wherein

the third intervening member has a hub engagement profile configured to engage with the bicycle hub assembly.

23. The bicycle sprocket assembly according to claim 16 , wherein

the third intervening member and the fourth intervening member are spaced apart from each other in a radial direction with respect to the rotational center axis.

24. The bicycle sprocket assembly according to claim 16 , wherein

the fourth intervening member is positioned radially inwardly from the second intervening member with respect to the rotational center axis.

25. The bicycle sprocket assembly according to claim 16 , wherein

the third intervening member is attached to at least one of the second sprocket and the third sprocket by adhesive, and

the fourth intervening member is attached to at least one of the second sprocket and the third sprocket by adhesive.

26. The bicycle sprocket assembly according to claim 16 , wherein

the third intervening member is attached to at least one of the second sprocket and the third sprocket by diffusion bonding, and

the fourth intervening member is attached to at least one of the second sprocket and the third sprocket by diffusion bonding.

27. The bicycle sprocket assembly according to claim 1 , wherein

the first intervening member has an annular shape and is disposed to be coaxial with respect to the rotational center axis of the bicycle sprocket assembly.

28. The bicycle sprocket assembly according to claim 27 , wherein

the second intervening member has an annular shape and is disposed to be coaxial with respect to the rotational center axis of the bicycle sprocket assembly.

29. The bicycle sprocket assembly according to claim 1 , wherein

the first sprocket has

a first opening provided on the first sprocket body, and

a first inner periphery defining the first opening, and

the second intervening member includes a first elongated portion at least partly extending along the first inner periphery.

30. The bicycle sprocket assembly according to claim 1 , wherein

the first sprocket has

first openings provided on the first sprocket body, and

first inner peripheries respectively defining the first openings, and

the second intervening member includes

first elongated portions each at least partly extending along one of the first inner peripheries, and

first additional elongated portions each at least partly extending along another of the first inner peripheries which is adjacent to the one of the first inner peripheries.

31. The bicycle sprocket assembly according to claim 29 , further comprising:

a third sprocket including a third sprocket body and a third chain-engagement structure configured to engage with the bicycle chain, the third sprocket body having a third hub engagement profile configured to engage with the bicycle hub assembly, the second sprocket being positioned between the first sprocket and the third sprocket in the axial direction;

a third intervening member positioned between the second sprocket and the third sprocket in the axial direction; and

a fourth intervening member positioned between the second sprocket and the third sprocket in the axial direction, the fourth intervening member being provided radially outwardly from the third intervening member with respect to the rotational center axis, wherein

the fourth intervening member is attached to at least one of the second sprocket and the third sprocket,

the second sprocket has

a second opening provided on the second sprocket body, and

a second inner periphery defining the second opening,

the first opening is aligned with the second opening in the axial direction, and

the fourth intervening member includes a second elongated portion at least partly extending the second inner periphery.

32. The bicycle sprocket assembly according to claim 30 , further comprising:

a third sprocket including a third sprocket body and a third chain-engagement structure configured to engage with the bicycle chain, the third sprocket body having a third hub engagement profile configured to engage with the bicycle hub assembly, the second sprocket being positioned between the first sprocket and the third sprocket in the axial direction;

a third intervening member positioned between the second sprocket and the third sprocket in the axial direction; and

a fourth intervening member positioned between the second sprocket and the third sprocket in the axial direction, the fourth intervening member being provided radially outwardly from the third intervening member with respect to the rotational center axis, wherein

the fourth intervening member is attached to at least one of the second sprocket and the third sprocket,

the second sprocket has

second openings provided on the second sprocket body, and

second inner peripheries respectively defining the second opening, and

the fourth intervening member includes

second elongated portions each at least partly extending along one of the second inner peripheries, and

second additional elongated portions each at least partly extending along another of the second inner peripheries which is adjacent to the one of the second inner peripheries.

33. The bicycle sprocket assembly according to claim 29 , wherein

the first elongated portion has the radial thickness and the circumferential length.

34. The bicycle sprocket assembly according to claim 30 , wherein

each of the first elongated portions has the radial thickness and the circumferential length.

35. The bicycle sprocket assembly according to claim 31 , wherein

the second elongated portion has the radial thickness and the circumferential length.

36. The bicycle sprocket assembly according to claim 32 , wherein

each of the second elongated portions has the radial thickness and the circumferential length.

37. The bicycle sprocket assembly according to claim 1 , wherein

the first sprocket includes a center opening and a first opening provided radially outward of the center opening, and

the second intervening member is at least partly provided radially outward of the first opening.