Belt Planetary Transmission

Abstract

A belt planetary transmission comprising a sun gear (1) having sun gear teeth (11), a ring gear (3) having ring gear teeth (31), a first toothed belt (4) trained between a first idler (50 and a second idler (51), the first idler and the second idler rotationally connected to a carrier (2), the first toothed belt (4) in simultaneous meshing contact with the ring gear teeth and the sun gear teeth, a second toothed belt (40) trained between a third idler (401) and a fourth idler (402), the third idler and the fourth idler rotationally connected to the carrier, the second toothed belt in simultaneous meshing contact with the ring gear teeth and the sun gear teeth, each of the first idler, second idler, third idler and fourth idler having a center of rotation disposed at a radius (R) from a center of rotation (A-A), and the first toothed belt and the second toothed belt are each in continuous meshing contact with the ring gear teeth and the sun gear teeth through an angle (α) of approximately 90°.

Dependencies are inferred from the claim text.