BICYCLE SPROCKET ASSEMBLY

• US 20120225745A1
• Filed: 03/01/2011
• Published: 09/06/2012
• Est. Priority Date: 03/01/2011
• Status: Active Grant

• Current Assignee: Shimano Inc
• Original Assignee: Shimano Inc
• Inventors: OISHI, Toshinari, TOKUYAMA, Koji, HYOGO, Keisuke
• Granted Patent: US 8,696,503 B2
• Time in Patent Office: Days
• US Class Current: 474/160
• CPC Class Codes: B62M 9/10 involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like bicycle hubs rotatably arranged on axle B60B27/023
• CPC Class Codes: B62M 9/121 Rear derailleurs
• CPC Class Codes: B62M 9/125 Mounting the derailleur on the frame

Abstract

A bicycle sprocket assembly is provided with at least a first sprocket, a second sprocket and a first axial spacer. The first sprocket includes an outermost peripheral portion defining a plurality of first teeth, and an innermost peripheral portion defining an opening that is free of any freewheel engaging splines. The first sprocket is larger than any other sprocket of the bicycle sprocket assembly. The second sprocket includes an outermost peripheral portion defining a plurality of second teeth, and an innermost peripheral portion defining an opening having a plurality of freewheel engaging splines. The first axial spacer is fixed to the first and second sprockets such that the first axial spacer is disposed between the first and second sprockets without any intervening sprockets disposed between the first and second sprockets. The first axial spacer includes an innermost peripheral portion defining an opening having a plurality of freewheel engaging splines.

Claims

1. A bicycle sprocket assembly comprising:

a first sprocket including an outermost peripheral portion defining a plurality of first teeth, and an innermost peripheral portion defining an opening that is free of any freewheel engaging splines, the first sprocket being larger than any other sprocket of the bicycle sprocket assembly;

a second sprocket including an outermost peripheral portion defining a plurality of second teeth, and an innermost peripheral portion defining an opening having a plurality of freewheel engaging splines; and

a first axial spacer fixed to the first and second sprockets such that the first axial spacer is disposed between the first and second sprockets without any intervening sprockets disposed between the first and second sprockets, the first axial spacer including an innermost peripheral portion defining an opening having a plurality of freewheel engaging splines.

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

the first axial spacer is fixed to the first and second sprockets by at least one common fastener.

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

the first axial spacer has a plurality of spacer arms.

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

the at least one common fastener includes a plurality of individual fasteners that extends through the spacer arms of the first axial spacer.

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

the second sprocket includes a plurality of sprocket arms, and a total number of the spacer arms of the first axial spacer being equal to a total number of the sprocket arms of the second sprocket.

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

the at least one common fastener includes a plurality of individual fasteners that extends through the spacer arms of the first axial spacer and the sprocket arms of the second sprocket.

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

a third sprocket including an outermost peripheral portion defining a plurality of third teeth, and an innermost peripheral portion defining an opening having a plurality of freewheel engaging splines, the third sprocket being smaller than the second sprocket;

and

a second axial spacer being disposed between the second and third sprockets without any intervening sprockets disposed between the second and third sprockets.

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

the second and third sprockets and the first and second axial spacers are fixed together by at least one common fastener that does not fix the first sprocket to the second and third sprockets.

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

each of the first and second axial spacers has a plurality of spacer anus.

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

a plurality of additional sprockets that are smaller than the first and second sprockets, each of the additional sprockets including an outermost peripheral portion defining a plurality of teeth and an innermost peripheral portion defining an opening having a plurality of freewheel engaging splines;

and

a plurality of additional axial spacers disposed between adjacent ones of the additional sprockets.

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

the first sprocket is radially straight as the first sprocket extends between the outermost peripheral portion and the innermost peripheral portion.