Rear wheel sprocket arrangement for a bicycle

Patent metadata

Field	Value
Publication number	US-2016362159-A1
Application number	US-201615178009-A
Country	US
Kind code	A1
Filing date	Jun 9, 2016
Priority date	Jun 9, 2015
Publication date	Dec 15, 2016
Grant date	—

Abstract

A rear wheel sprocket arrangement for a bicycle comprises 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 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 an average percentage gear stage step lies within a range of fifteen percent (15%) to thirty percent (30%).

2 . 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%).

3 . 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%).

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

5 . A rear wheel sprocket arrangement according to claim 1 , wherein values of individual percentage gear stage steps lie within a range of fifteen percent (15%) to thirty-five percent (35%).

6 . A rear wheel sprocket arrangement according to claim 1 , 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 a group of axially successive sprockets which become degressively larger.

7 . A rear wheel sprocket arrangement according to claim 6 , 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.

8 . A rear wheel sprocket arrangement according to claim 7 , 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.

9 . A rear wheel sprocket arrangement according to claim 7 , 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.

10 . A rear wheel sprocket arrangement according to claim 1 , wherein a largest sprocket of the plurality of sprockets has at least forty-four (44) teeth.

11 . A rear wheel sprocket arrangement according to claim 10 , wherein the largest sprocket has at least forty-eight (48) teeth.

12 . A rear wheel sprocket arrangement according to claim 10 , wherein a smallest sprocket of the plurality of sprockets has at least ten (10) teeth and not more than thirteen (13) teeth.

13 . A rear wheel sprocket arrangement according to claim 12 , wherein the smallest sprocket has at least eleven (11) teeth and not more than thirteen (13) teeth.

14 . A rear wheel sprocket arrangement according to claim 1 , wherein the number of teeth of each of four (4) largest sprockets of the plurality of sprockets is an integral multiple of four (4).

15 . A rear wheel sprocket arrangement according to claim 14 , wherein the number of teeth of each of the four (4) largest sprockets of the plurality of sprockets is an integral multiple of eight (8).

16 . A rear wheel sprocket arrangement according to claim 14 , wherein the number of teeth of each of three (3) sprockets from a group of four (4) axially successive sprockets, comprising the sprockets from a fourth largest sprocket to a seventh largest sprocket, is an integral multiple of three (3).

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

18 . 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.

19 . A rear wheel sprocket arrangement according to claim 18 , wherein the largest sprocket is coupled to the driver by an adapter element for the 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.

20 . 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.

21 . A rear wheel sprocket arrangement according to claim 20 , wherein at least four (4) sprockets of the plurality of sprockets are designed as the single-piece sprocket component within the rear wheel sprocket arrangement.

22 . A rear wheel sprocket arrangement according to claim 20 , wherein largest and smallest sprockets of the plurality of sprockets are each formed separately as individual sprockets.

23 . A rear wheel sprocket arrangement according to claim 20 , wherein the single-piece sprocket component comprises a second largest sprocket.

24 . A rear wheel sprocket arrangement according to claim 1 , wherein the plurality of sprockets comprises only seven (7) sprockets.

25 . A rear wheel sprocket arrangement according to claim 1 , wherein the plurality of sprockets comprises only eight (8) sprockets.

26 . A rear wheel sprocket arrangement according to claim 1 , wherein the plurality of sprockets comprises only nine (9) sprockets.

27 . A rear wheel sprocket arrangement according to claim 1 , wherein a front face distance between axially directly adjacent sprockets is between 4.2 millimeters and 4.4 millimeters.

28 . A rear wheel sprocket arrangement according to claim 27 , wherein the front face distance between axially directly adjacent sprockets is between 4.3 millimeters and 4.4 millimeters.

29 . A drive assembly for a bicycle, comprising a rear wheel sprocket arrangement according to claim 1 , and a front chainring, wherein the number of teeth of the front chainring is smaller than the number of teeth of a largest sprocket of the plurality of sprockets and larger than the number of teeth of a third largest sprocket of the plurality of sprockets.

30 . A drive assembly for a bicycle according to claim 29 , wherein the front chainring and a second largest sprocket of the plurality of sprockets have the same number of teeth.

31 . A drive assembly for a bicycle according to claim 29 , further comprising an assisting electric motor configured to transmit assisting torque to the rear wheel via the rear wheel sprocket arrangement, wherein the assisting electric motor is coupled to the chainring in order to transmit torque.

Assignees

• Sram De Gmbh

Inventors

• Braedt Henrik

Classifications

• B62M9/12

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

• B62M9/121

  Rear derailleurs · CPC title

• F16H55/30

  Chain-wheels · CPC title

• B62M6/55

  power-driven at crank shafts parts · CPC title