Jockey wheel for a rear derailleur in a bicycle gear system and rear derailleur with such a jockey wheel

US9316302B2 · kind B2 · utility

Assignee

• SRAM DEUTSCHLAND GmbH · DE

Inventors

• Henrik Braedt · Diez, DE
• Robert Boehm · Mainberg, DE
• Thorsten Hamisch · Obbach, DE

Key dates

• Filing date: Jul 9, 2013
• Grant date: Apr 19, 2016
• Expiry date: Apr 3, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62M9/126
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a guide wheel for a rear derailleur in a bicycle gear system for guiding a chain, including an annular wheel body with a central opening for rotatable bearing about a rotational axis of the guide wheel. The guide wheel includes a plurality of radially projecting teeth that are arranged on an outer circumferential surface of the wheel body. A tooth gap is arranged between each adjacent pair of teeth, individual teeth in the area of a root circle of the gear teeth having a predetermined tooth width matched to the chain. For improving the guiding properties, it is provided that the guide wheel has on at least some of the tooth gaps in the area near a tooth gap base and/or on at least some of the teeth at least one guide segment with a greater width than the tooth width of at least one of the adjacent teeth.