Method for manufacturing outer ring of constant velocity joint

A method for manufacturing an outer ring of a constant velocity joint including an inner rotational member disposed radially inward of the outer ring, a rolling element configured to transmit torque between the outer ring and the inner rotational member, and a defining member that defines a grease-filled region, the method comprising:

• providing a bottomed tubular base member including a second opening, a bottom, and a second inner peripheral surface
• partially removing the bottom of the tubular base member so as to form the outer ring with a through hole passing through the bottom along an axis of the outer ring by a punching process using a die;
• and
• further processing, after the punching process, the outer ring at the through hole to form a first opening and a first inner peripheral surface in the bottom by a cutting process so as to form a protrusion such that a surface of a remainder of the bottom resulting from the formation of the through hole and facing toward the second opening serves as a surface of the protrusion, wherein
• the first opening is at a first end of the outer ring and the second opening is at a second end of the outer ring such that the outer ring has a tubular shape,
• the second inner peripheral surface extends from the second opening toward the first opening and is configured such that the inner rotational member and the rolling element are movable along the second inner peripheral surface,
• the protrusion protrudes radially inward of the first inner peripheral surface and the second inner peripheral surface and is configured to restrict axial movement of the inner rotational member and the rolling element,
• the first inner peripheral surface extends from the first opening toward the second opening and is configured such that the defining member is attachable to the first inner peripheral surface adjacent to the first opening, and
• the second inner peripheral surface includes:
• a plurality of outer ring ball grooves extending along the axis of the tubular base member;
• and
• a plurality of cylindrical surfaces extending along the axis of the tubular base member, and
• the protrusion is formed on at least one of the outer ring ball grooves and the cylindrical surfaces.