Rear wheel sprocket arrangement for a bicycle

Patent metadata

Field	Value
Publication number	US-10933946-B2
Application number	US-201916391961-A
Country	US
Kind code	B2
Filing date	Apr 23, 2019
Priority date	Jun 9, 2015
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

A rear wheel sprocket arrangement for a bicycle comprises a plurality of coaxially arranged sprockets having different numbers of teeth, wherein an entire gear range of the sprocket arrangement is at least three-hundred fifty percent (350%), and wherein an average percentage gear stage step lies within a range of fifteen percent (15%) to thirty percent (30%).

First claim

What is claimed:

1. A rear wheel sprocket arrangement for a bicycle comprising:
a plurality of sprockets comprising at least seven (7) coaxially arranged sprockets having different numbers of teeth,
wherein an entire gear range of the sprocket arrangement is at least three-hundred fifty percent (350%), and
wherein values of individual percentage gear stage steps lie within a range of fifteen percent (15%) to thirty-five percent (35%), and
wherein the plurality of sprockets comprises, when viewing in an axial direction from a smallest sprocket towards a largest sprocket, a group of axially successive sprockets which become progressively larger, and
between which the values of individual percentage gear stage steps increase from one gear stage to a next, and a group of axially successive sprockets which become degressively larger and between which the values of the individual percentage gear stage steps decrease from one gear stage to the next.

2. A rear wheel sprocket arrangement according to claim 1 , wherein an average percentage gear stage step lies within a range of fifteen percent (15%) to thirty percent (30%).

3. A rear wheel sprocket arrangement according to claim 1 , wherein the entire gear range of the sprocket arrangement is at least four-hundred percent (400%).

4. A rear wheel sprocket arrangement according to claim 1 , wherein the entire gear range of the sprocket arrangement is at least four-hundred thirty-five percent (435%).

5. A rear wheel sprocket arrangement according to claim 1 , wherein an average percentage gear stage step lies within a range of twenty percent (20%) to thirty percent (30%).

6. A rear wheel sprocket arrangement according to claim 1 , wherein the group of axially successive sprockets which become progressively larger is placed axially between two (2) groups of axially successive sprockets which become degressively larger.

7. A rear wheel sprocket arrangement according to claim 6 , wherein a largest individual percentage gear stage step occurs between a third largest sprocket of the plurality of sprockets and a fourth largest sprocket of the plurality of sprockets or between the fourth largest sprocket and a fifth largest sprocket of the plurality of sprockets.

8. A rear wheel sprocket arrangement according to claim 6 , wherein a largest individual percentage gear stage step occurs between a third largest sprocket of the plurality of sprockets and a fourth largest sprocket of the plurality of sprockets and between the fourth largest sprocket and a fifth largest sprocket of the plurality of sprockets.

9. A rear wheel sprocket arrangement according to claim 1 , wherein a smallest sprocket of the plurality of sprockets has ten (10) teeth.

10. A rear wheel sprocket arrangement according to claim 1 , wherein a largest sprocket of the plurality of sprockets is generally planar.

11. A rear wheel sprocket arrangement according to claim 1 , wherein a largest sprocket of the plurality of sprockets has a central opening through which a driver passes, wherein there is no direct form-fitting engagement between the largest sprocket and the driver for transmitting torque from the largest sprocket to the driver.

12. A rear wheel sprocket arrangement according to claim 11 , wherein the largest sprocket is coupled to the driver by an adapter element for transmission of torque, wherein the adapter element is placed on a side of the largest sprocket which faces away from the rest of the plurality of sprockets.

13. A rear wheel sprocket arrangement according to claim 1 , wherein at least three (3) sprockets are designed as a single-piece sprocket component within the rear wheel sprocket arrangement.

14. A rear wheel sprocket arrangement according to claim 13 , wherein the single-piece sprocket component comprises a second largest sprocket.

15. A drive assembly for a bicycle according to claim 1 , further comprising a front chainring having the same number of teeth as a second largest sprocket of the plurality of sprockets.

16. A drive assembly for a bicycle according to claim 1 , further comprising an assisting electric motor configured to transmit assisting torque to athc rear wheel via the rear wheel sprocket arrangement, wherein the assisting electric motor s coupled to a chainring in order to transmit torque.

Assignees

• Sram De Gmbh
• Sram Deutschland

Inventors

• Braedt Henrik

Classifications

• B62M9/121

  Rear derailleurs · CPC title

• F16H55/30

  Chain-wheels · CPC title

• B62M9/12

  the chain, belt, or the like being laterally shiftable {, e.g. using a rear derailleur} · CPC title

• B62M6/55

  power-driven at crank shafts parts · CPC title

• 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