Patent ID: 8083624
Filing Date: 2011-12-27
Classification: F16H

Abstract:
1. A sprocket assembly comprising: a body including a ring of teeth and first and second hubs that project axially outward relative to opposite first and second faces of said ring of teeth, said first and second hubs defining respective first and second outside diameters each having a radius HR, and said ring of teeth comprising N teeth separated from each other by respective tooth spaces, said teeth each comprising engaging and disengaging flanks, wherein respective root surfaces are located between engaging and disengaging flanks of successive teeth, said sprocket body defining a chordal pitch P, a pitch diameter PD and a pitch chord radius R first and second sets of metal cushion rings eccentrically captured on said first and second hubs, respectively, said first and second sets of cushion rings having a radial thickness RT; wherein: wherein said root surfaces are each undercut relative to said pitch diameter PD so that rollers/bushings of the associated chain cannot contact the undercut root surfaces when said chain is in hard contact with respective outside diameter locations of said first and second sets of metal cushion rings and when said outside diameter locations are respectively radially aligned with respective inside diameter locations of said first and second sets of metal cushion rings that are respectively in hard contact with said first and second hubs.