Low-noise chainwheel

US8517874B2 · kind B2 · utility

Assignee

• SRAM DEUTSCHLAND GmbH · DE

Inventor

• Markus Reiter · Schweinfurt, DE

Key dates

• Filing date: Oct 8, 2004
• Grant date: Aug 27, 2013
• Expiry date: Jun 7, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H55/30
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A bicycle chainwheel assembly that includes at least one smaller chainwheel and at least one larger chainwheel, the chainwheels engageable by a chain. The larger chainwheel includes a first tooth and a second tooth disposed adjacent the first tooth opposite a drive rotation direction. The first tooth and the second tooth have a configuration that improves the shifting of a chain from a smaller chainwheel to the larger chainwheel. The first tooth has a lateral recess and the second tooth has a deflection chamfer. The second tooth may also have a recess. The first and second teeth have a configuration that prevents the first and second teeth from capturing the chain. An inner link plate of the chain includes a chamfer disposed on an outer side surface in a central region of the plate.