OUTER MEMBER OF CONSTANT SPEED UNIVERSAL JOINT

摘要

Provided is an outer member of a constant velocity universal joint, which suppresses occurrence of cracking in a joining portion of the constant velocity universal joint and has stable quality. The outer member of the constant velocity universal joint includes: a cup section (1) having a plurality of track grooves formed therein; and a shaft section (2) having one end coupled to a bottom portion of the cup section (1). By joining members having different carbon contents to each other and then performing induction hardening on the members, a hardening heat-affected portion affected by the induction hardening, a hardening heat-unaffected portion unaffected by the induction hardening, a joining heat-affected portion affected by heat generated at a time of the joining, and a joining heat-unaffected portion unaffected by the heat generated at the time of the joining are formed. A martensitic structure is eliminated from a portion that is the hardening heat-unaffected portion of one of the members having a high carbon content and is the joining heat-affected portion at an end portion (25) including a joining end surface (23) that is to be joined to another one of the members having a low carbon content.