MANUFACTURING METHOD FOR OUTER JOINT MEMBER OF CONSTANT VELOCITY UNIVERSAL JOINT AND OUTER JOINT MEMBER.

摘要

A manufacturing method for an outer joint member (11) of a constant velocity universal joint (10) involves forming a cup member (12a) and a shaft member (13a) with a medium carbon steel. The manufacturing steps of the cup member (12a) include a machining step and a heat treatment step, which come after a cylindrical section (12a1) and a bottom section (12a2) have been integrally formed in a forging step. In the machining step, the cup member (12a) is prepared as a finished part by forming a joining hole (50) in the thick part of the bottom section (12a2). The shaft member (13a) includes a machining step and a heat treatment step. In the machining step of the shaft member (13a), the shaft member (13a) is prepared as a finished part by forming a joining outer surface (51) on the end of the shaft member (13a) that is joined to the bottom section (12a2) of the cup member (12a). The joining hole (50) of the finished cup member and the joining outer surface (51) of the finished shaft member (13a) are welded together by irradiating a fitting part (60) with a beam from the inside of the cup member (12a). The diameter of the fitting part (60) is characterized by having the same dimensions for each joint size.