Patent ID: 6932729

Claim:
A compressor comprising a power transmission mechanism, wherein the power transmission mechanism comprises: a shaft; a first rotation member fixed to the shaft, wherein the first rotation member comprises a plurality of accommodation portions; a second rotation member rotatably arranged around the periphery of the first rotation member, wherein the second rotation member has an inner surface facing the first rotation member, and the second rotation member comprises a plurality of recessed hollows formed in the inner surface; a plurality of balls, wherein a first portion of each of the balls is positioned within at least one of the accommodation portions and a second portion of each of the balls is positioned within at least one of the hollows, such that a rotational motion of the second rotation member is transmitted to the first rotation member via the balls; and a ring plate adapted to apply a predetermined amount of force to the balls, wherein the predetermined amount of force is sufficient to maintain the balls within their corresponding at least one accommodation portion, and wherein the second rotation member comprises means for preventing the balls from moving in an axial direction within their corresponding at least one hollow.