METHOD OF MANUFACTURING OUTSIDE JOINT MEMBER OF CONSTANT VELOCITY UNIVERSAL JOINT, OUTSIDE JOINT MEMBER, SHAFT MEMBER AND CUP MEMBER

摘要

This method is for manufacturing an outside joint member (11, 21) of a constant velocity universal joint which comprises, as separate members, a cup (12) forming on the inner periphery a track groove (30) in which a torque transmission element (19, 23, 42) engages, and a shaft (13) which is formed on the bottom of the cup (12), wherein a cup member (12a) forming the cup (12) and a shaft member (13a) forming the shaft (13) are welded together. This method is characterized in that the cup member (12a) and the shaft member (13a) are formed with medium carbon steel, with the cup member (12a) being prepared by integrally forming a cylindrical part (12a1) and a bottom part (12a2) in a forging process and thereafter by forming a joining end surface (50) on the outer surface of the bottom part (12a2) in a machining processing step, and the shaft member (13a) being prepared by forming a joining end surface (51) which is joined to the bottom part (12a2) of the cup member (12a) in a machining processing step; the joining end surface (50) of the cup member (12a) and the joining end surface (50, 51) of the shaft member (13a) are abutted against one another and this abutted section is welded by irradiation in the radial direction with a beam from outside of the cup member (12a), with the outer diameter (B) of the joining end surface (50) of the cup member (12a) having the same dimension for each joint size; in a ultrasound fault detection step (S6k), a welding depth verification chamfer (50a) is provided on the radially inner side of the welding end surface of the joining end surface (50, 51) of the shaft member (13a) or the cup member (12a), and after welding has been performed in that state, fault detection is performed from the surface side of the member that has the joining end surface.