INNER RING OF CONSTANT VELOCITY UNIVERSAL JOINT AND ITS MANUFACTURING DEVICE

摘要

An inner ring (10) of a constant velocity universal joint comprises ball grooves (12) formed on the outer peripheral surface (14) of the ring at predetermined intervals in the circumferential direction. A chamfer (16) is formed on the side wall of each of the ball grooves (12) at the portion which forms an ridge line with the outer peripheral surface (14) over the entire length in the axial direction.