Infinitely variable disc and pinion gearing - is fitted with teeth on disc face extending along sector lines

摘要

An infinitely variable gearing system has a toothed pinion (46) engaging with cooperating teeth on the surface of a disc, the gear ratio being varied by moving the pinion radially across the disc. The disc teeth are arranged in four sectors, each tooth being defined by a pair of grooves (49, 50) meeting at a right angle bisected by a line intersecting the disc axis. The pinion teeth are semispherical and slide along the length of the grooves as the disc rotates. The corner formed by each pair of grooves has a rounded recess to accommodate transition of the pinion teeth from one groove of the pair to the other.