Multiple sprocket assembly for a bicycle

Patent metadata

Field	Value
Publication number	US-9308967-B2
Application number	US-93998910-A
Country	US
Kind code	B2
Filing date	Nov 4, 2010
Priority date	Nov 4, 2009
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A multiple sprocket assembly engageable with a roller chain and mountable to a driver of a rear wheel of a bicycle. The multiple sprocket assembly includes a smaller sprocket and a larger sprocket. Each of the smaller and larger sprockets has a radially outer ring with a plurality of teeth for engaging the roller chain. The radially outer ring has a plurality of radially outer pin mounts including a hole. The radially outer pin mounts are aligned with the teeth. The sprockets have a plurality of radially inner pin mounts connected to the radially outer ring forming a single piece. The radially inner pin mounts includes a hole. The radially inner pin mounts are aligned with the plurality of outer pin mounts disposed on an adjacent smaller sprocket. A plurality of pins connects the smaller sprocket and the larger sprocket to each other. The pins are mounted in the holes in the outer pin mounts on the smaller sprocket and in the holes in the inner pin mounts of the larger sprocket. A first mounting sprocket is connected to the smaller sprocket by pins and a second mounting sprocket is connected to the larger sprocket by pins. The first and second mounting sprockets are supported on the hub axle at two positions spaced, apart in the axial direction of the hub axle.

First claim

What is claimed:

1. A multiple sprocket assembly for engaging a roller chain and mountable to a driver of a rear wheel of a bicycle, the driver rotatable relative to a hub axle, the driver nonrotatably connected to a hub shell in the forward direction of rotation and rotatably connected to the hub shell in the backward direction of rotation, the sprocket assembly comprising:
a smaller sprocket;
a larger sprocket,
each of the smaller and larger sprockets having a radially outer ring with a plurality of teeth for engaging the roller chain, the radially outer ring having a plurality of radially outer pin mounts including a plurality of holes, each hole of the radially outer pin mounts radially aligned with a tooth of the plurality of teeth, the larger sprocket also having a radially inner ring having a plurality of radially inner pin mounts connected to the radially outer ring of the larger sprocket forming a single piece, the radially inner pin mounts including a plurality of holes, each hole of the radially inner pin mounts aligned with a tooth of the plurality of teeth of the smaller sprocket, wherein there are openings separating the outer ring and the inner ring of at least the inner sprocket or the outer sprocket;
a plurality of pins connecting the smaller sprocket and the larger sprocket to each other, the pins mounted in the holes in the outer pin mounts on the smaller sprocket and in the holes in the inner pin mounts of the larger sprocket;
a first mounting sprocket connected to the smaller sprocket by pins; and
a second mounting sprocket connected to the larger sprocket by pins and including a torque-transmitting profile engageable with the driver,
the first and second mounting sprockets radially supported on the hub axle at two positions spaced apart in the axial direction of the hub axle.

2. The multiple sprocket assembly of claim 1 wherein the radially inner ring has circumferential connectors extending between at least two adjacent inner pin mounts.

3. The multiple sprocket assembly of claim 2 wherein a radially outer edge of the hole in the outer pin mount is disposed at a radial height of an outer base contour between adjacent teeth and an edge of the hole is spaced from a load flank of an adjacent tooth by a distance equal to about a diameter of the pin.

4. The multiple sprocket assembly of claim 2 wherein the larger sprocket includes radial connectors extending between the radially outer pin mounts and the radially inner ring.

5. The multiple sprocket assembly of claim 4 wherein one of the smaller and larger sprockets includes a radial support radially abutting the driver.

6. The multiple sprocket assembly of claim 5 , the second mounting sprocket having a number of teeth greater than the larger sprocket and a radial support radially abutting the driver.

7. The multiple sprocket assembly of claim 1 wherein each of the pins are interference fit into a respective hole.

8. The multiple sprocket assembly of claim 1 wherein the pins are one of glued and welded to the sprockets.

9. The multiple sprocket assembly of claim 1 wherein the pins have a support collar in their axial direction.

10. The multiple sprocket assembly of claim 9 wherein the second mounting sprocket has an inner region, an outer region and connecting arms disposed between the inner and outer regions.

11. The multiple sprocket assembly of claim 10 wherein the connecting arms are sloped in the drive direction of rotation between the outer region and the inner region.

12. The multiple sprocket assembly of claim 11 wherein the inner region has openings and inner arms sloped from radially outward to radially inward in the drive direction of rotation.

13. The multiple sprocket assembly of claim 1 wherein the pins include at least one beveled end.

14. The multiple sprocket assembly of claim 13 wherein the beveled end of the pin protrudes beyond a face of the larger sprocket.

15. The multiple sprocket assembly of claim 14 wherein an end of the pin on the smaller sprocket is flush with a face of the smaller sprocket.

16. The multiple sprocket assembly of claim 14 wherein the beveled end of the pin protrudes beyond a face of the smaller sprocket.

Assignees

• Braedt Henrik
• Sram De Gmbh

Inventors

• Braedt Henrik

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

• F16H55/303

  for round linked chains, i.e. hoisting chains with identical links · CPC title