Bicycle rear sprocket assembly

Patent metadata

Field	Value
Publication number	US-11465710-B2
Application number	US-201916709876-A
Country	US
Kind code	B2
Filing date	Dec 10, 2019
Priority date	Dec 10, 2019
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A bicycle rear sprocket assembly comprises a first sprocket and a second sprocket. The first sprocket includes a first torque-transmitting profile disposed around a first sprocket opening. The second sprocket includes a second torque-transmitting profile disposed around a second sprocket opening. The first torque-transmitting profile is configured to engage with the second torque-transmitting profile in the mounted state. The first sprocket includes an axial abutment surface configured to axially abut against the second sprocket for axially positioning the first sprocket and the second sprocket relative to each other in the mounted state. The axial abutment surface is disposed farther from an axial center plane of the bicycle rear hub assembly than the first torque-transmitting profile in the mounted state.

First claim

What is claimed is:

1. A bicycle rear sprocket assembly configured to be mounted to a sprocket support body of a bicycle rear hub assembly, the bicycle rear sprocket assembly comprising:
a first sprocket having a first sprocket opening, a first hub-center facing side and a first hub-center far side provided on a reverse side of the first hub-center facing side in an axial direction with respect to a rotational center axis of the bicycle rear sprocket assembly, the first hub-center facing side being configured to face toward an axial center plane of the bicycle rear hub assembly in a mounted state where the bicycle rear sprocket assembly is mounted to the bicycle rear hub assembly, the first sprocket including a first torque-transmitting profile disposed around the first sprocket opening; and
a second sprocket having a second sprocket opening, a second hub-center facing side and a second hub-center far side provided on a reverse side of the second hub-center facing side in the axial direction, the second hub-center facing side being configured to face toward the axial center plane of the bicycle rear hub assembly in the mounted state, the second sprocket including a second torque-transmitting profile disposed around the second sprocket opening, the second sprocket being configured to be disposed closer to the axial center plane of the bicycle rear hub assembly than the first sprocket in the mounted state,
the first torque-transmitting profile of the first sprocket being configured to engage with the second torque-transmitting profile of the second sprocket to transmit a rotational force between the first torque-transmitting profile and the second torque-transmitting profile in the mounted state;
the first sprocket including an axial abutment surface configured to axially abut against the second sprocket for axially positioning the first sprocket and the second sprocket relative to each other in the mounted state, and
the axial abutment surface being disposed farther from the axial center plane of the bicycle rear hub assembly than the first torque-transmitting profile in the mounted state.

2. The bicycle rear sprocket assembly according to claim 1 , wherein
the axial abutment surface is adjacent to the first torque-transmitting profile in the axial direction.

3. The bicycle rear sprocket assembly according to claim 1 , wherein
the axial abutment surface is disposed radially outwardly from the first torque-transmitting profile.

4. The bicycle rear sprocket assembly according to claim 1 , wherein
the first torque-transmitting profile includes a first axial end disposed closer to the first hub-center facing side than to the first hub-center far side in the axial direction, and
the second torque-transmitting profile includes a second axial end disposed closer to the second hub-center far side than to the second hub-center facing side in the axial direction.

5. The bicycle rear sprocket assembly according to claim 1 , wherein
a total tooth number of the first sprocket is smaller than a total tooth number of the second sprocket.

6. The bicycle rear sprocket assembly according to claim 5 , wherein
the total tooth number of the first sprocket is equal to or smaller than fourteen.

7. The bicycle rear sprocket assembly according to claim 1 , wherein
the first torque-transmitting profile includes a plurality of first torque-transmitting spline teeth, and
the second torque-transmitting profile includes a plurality of second torque-transmitting spline teeth.

8. The bicycle rear sprocket assembly according to claim 1 , wherein
the second torque-transmitting profile of the second sprocket is configured to engage with a hub torque-transmitting profile of the sprocket support body in the mounted state.

9. The bicycle rear sprocket assembly according to claim 1 , wherein
the second sprocket includes a third torque-transmitting profile disposed around the second sprocket opening at least on the second hub-center facing side, and
the third torque-transmitting profile of the second sprocket is configured to engage with a hub torque-transmitting profile of the sprocket support body in the mounted state.

10. The bicycle rear sprocket assembly according to claim 9 , wherein
the third torque-transmitting profile is offset from the second torque-transmitting profile in a circumferential direction with respect to the rotational center axis.

11. The bicycle rear sprocket assembly according to claim 1 , wherein
the first sprocket is configured to be disposed axially outwardly from the sprocket support body of the bicycle rear hub assembly with respect to the rotational center axis in the mounted state.

12. A bicycle rear sprocket assembly configured to be mounted to a sprocket support body of a bicycle rear hub assembly, the bicycle rear sprocket assembly comprising:
a first sprocket having a first sprocket opening, a first hub-center facing side and a first hub-center far side provided on a reverse side of the first hub-center facing side in an axial direction with respect to a rotational center axis of the bicycle rear sprocket assembly, the first hub-center facing side being configured to face toward an axial center plane of the bicycle rear hub assembly in a mounted state where the bicycle rear sprocket assembly is mounted to the bicycle rear hub assembly, the first sprocket including a first torque-transmitting profile disposed around the first sprocket opening at least on the first hub-center facing side; and
a second sprocket having a second sprocket opening, a second hub-center facing side and a second hub-center far side provided on a reverse side of the second hub-center facing side in the axial direction, the second hub-center facing side being configured to face toward the axial center plane of the bicycle rear hub assembly in the mounted state, the second sprocket including a second torque-transmitting profile disposed around the second sprocket opening so that the second torque-transmitting profile extends at least between the second hub-center facing side and the second hub-center far side, the second sprocket being configured to be disposed closer to the axial center plane of the bicycle rear hub assembly than the first sprocket in the mounted state,
the second torque-transmitting profile of the second sprocket being configured to engage with the first torque-transmitting profile of the first sprocket and a hub torque-transmitting profile of the sprocket support body in the mounted state, and
the second torque-transmitting profile of the second sprocket being configured to engage with the first torque-transmitting profile of the first sprocket in a circumferential direction with respect to the rotational center axis.

13. The bicycle rear sprocket assembly according to claim 12 , wherein
the second torque-transmitting profile of the second sprocket is configured to engage with the first torque-transmitting profile of the first sprocket on the second hub-center far side in the mounted state and configured to engage with a hub torque-transmitting profile of the sprocket support body on the second hub-center facing side in the mounted state.

14. The bicycle rear sprocket assembly according to claim 12 , wherein
the second torque-transmitting profile extends beyond a sprocket axial center plane of the second sprocket.

15. The bicycle rear sprocket assembly according to claim 12 , wherein
the second torque-transmitting profile extends from the second hub-center facing side to the second hub-center far side.

16. A bicycle rear sprocket assembly configured to be mounted to a sprocket s

Assignees

• Shimano Kk

Inventors

• Fukumori Tsuyoshi
• Oka Tomonari

Classifications

• B62M9/10 Primary

  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 title