Riveted sprocket assembly

US8100795B2 · kind B2 · utility

Assignee

• SRAM DEUTSCHLAND GmbH · DE

Inventor

• Markus Reiter · Schweinfurt, DE

Key dates

• Filing date: May 31, 2005
• Grant date: Jan 24, 2012
• Expiry date: Jul 31, 2026

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62M9/10
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A riveted sprocket assembly that includes a sprocket carrier having a plurality of carrier arms and a plurality of sprockets attached to the carrier arms by rivets. First and second rivet heads of the rivets are countersunk into the carrier arms on one face and into the sprocket on the other face. The second rivet head is formed on the sprocket on the front face of the sprocket carrier. To prevent the riveting tool from damaging the sprocket during the riveting process, the rivet holes of the sprockets include a clearance portion around the second rivet head. This results in the sprocket having three-stepped rivet holes: a small diameter for the rivet shaft, an intermediate diameter for the rivet head and a larger diameter for the riveting tool. To minimize weight, the carrier arms narrow in a central region between radially inner and radially outer rivet holes on the carrier arms.