Random elastomer cushion rings for a chain sprocket

Patent No. 8,202,185

Issued: June 19, 2012
Filed: January 9, 2009

Inventor: Haesloop; J. Christian (Ithaca, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI)

A sprocket includes a plurality of teeth spaced about its periphery, roots located between pairs of adjacent teeth, and a cushion ring contacted by a chain engaging the sprocket teeth. The roots have root radii defined as the distance between the center of sprocket and the point along the root closest to the sprocket center in the radial direction. In some embodiments, the roots have three distinct radii. The cushioning material of the cushion ring receives the impact while engaging the chain. In some embodiments, the cushion ring has a contour substantially following the contours of the sprocket teeth geometry. In some embodiments, the cushion ring has a randomized contour to provide predetermined cushioning that varies from tooth to tooth around the sprocket.

Reference to Related Applications

This is a continuation-in-part patent application of co-pending application Ser. No. 10/959,738, filed Oct. 6, 2004, entitled "ELASTOMER CUSHION RING FOR A RANDOM TOOTH ROLLER CHAIN SPROCKET". The aforementioned application is hereby incorporated herein by reference.

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