RATIO CHANGING METHOD AND APPARATUS

摘要

A ratio changing method and apparatus includes, in a hypocycle arrangement, an input drive wheel (2), an output drive wheel (3) and a transfer ring (1). The input drive wheel (2) drives around the exterior of the transfer ring (1). The transfer ring (1) is constrained against rotation about its own axis but oscillates about the outward drive wheel (3), in parting rotation to the output drive wheel (3) as a result a simple and effective ratio changing apparatus is provided.