Sprocket tooth profile for a roller or bush chain

Patent No. 7,740,555

Issued: June 22, 2010
Filed: October 14, 2005

Inventors: Markley; George L. (Montour Falls, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)


An improved sprocket profile for engaging a roller or bush chain smoothly and preventing radial impact with the root of the tooth during engagement. Contact between the sprocket teeth and the roller chain is altered by providing teeth with a root radius equivalent to that of the chain engaging component, with the center point of the root radius located one chordal distance inside the sprocket's pitch circle. This profile allows chain rollers or bushings to impact sprocket teeth tangentially on their flanks rather than radially on their tooth root.


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