Patent Number: 6,170,156

Title: Gear tooth smoothing and shaping process

Abstract: The fatigue life of gears, for example, the gears in a sun gear-planetary gear set, is markedly improved by forming the respective gears by ordinary manufacturing practices and then running each new gear against a durable, but expendable, dummy of its counter-gear. The teeth of a dummy sun gear may be suitably hardened and used under suitable loads to minimally reshape the teeth of a plurality of newly-made pinions so that they are smoothed and better fit an intended sun gear. Similarly, the roughened teeth of a hardened or hard coated sun gear can be smoothed by running it for a few rotations against an expendable pinion.

Inventors: Lev; Leonid Charles (Birmingham, MI), Weiner; Anita Miriam (West Bloomfield, MI), Harris; Stephen Joel (Bloomfield, MI)


International Classification: B21D 53/26 (20060101); B21D 53/28 (20060101); B21H 5/00 (20060101); B21H 5/02 (20060101); B21D 053/28 ()

Expiration Date: 01/09/2013