Patent ID: 7244206
Filing Date: 2007-07-17
Classification: F16G,F16H

Abstract:
1. A roller chain transmission in the timing draive of an automobile engine, the transmission comprising a toothed driving sprocket on a crankshaft of the engine, at least one toothed driven sprocket on a camshaft of the engine, and a roller chain having interleaved pairs of inner and outer plates, cylindrical bushings fixed to bushing holes in the inner plates, pins rotatable in said bushings and fixed to pin holes in the outer plates, rollers rotatable on said bushings, said toothed sprockegts meshing with the roller chain, wherein the outer diameter D of the rollers, the outer diameter d of the pins and the height H of the inner plates satisfy the following relationships with respect to the pitch P of the roller chain:  and wherein the teeth of at least one of said sprockets have an arc-shaped tooth gap bottom having a radius R  where R