Inner joint part for constant velocity universal joint has ball tracks that each form hard-machined first track portion for guiding balls, and an unmachined second track portion which does not have guiding function for balls

摘要

The inner joint part (2) has an outer spherical guiding face (3) for guiding a ball cage of the constant velocity universal joint; and circumferentially distributed ball tracks (4) formed into the spherical guiding face and provided for receiving torque transmitting balls. The ball tracks each form a hard-machined first track portion (11) for guiding the balls, and an unmachined second track portion (12) which does not have a guiding function for the balls. Independent claims: (1) a process of producing an inner joint part; (2) a constant velocity plunging joint; and (3) a constant velocity universal joint.