| 摘要 |
Provided is a manufacturing method for a constant velocity universal joint outer joint member that comprises a cup part and shaft part made from separate members with the cup member forming the cup part and the shaft member forming the shaft part being welded together, said cup part having an inner circumference in which a track groove for engaging with a torque transmitting element is formed and said shaft part being formed on the bottom part of the cup part. This manufacturing method uses a medium-carbon steel to form the cup member and the shaft member and comprises the manufacturing steps of: preparing the cup member by integrally forming a cylindrical part and bottom part of the cup member, then forming a fitting hole in the thickness of the bottom part in a machining step; preparing the shaft member, which is to be joined to the bottom part of the cup member, so that a fitting outer face is formed on an end part of the shaft member in a machining step; and fitting the fitting hole of the cup member with the fitting outer face of the shaft member and welding by focusing a beam on the fitted parts from the inside of the cup member. The fitting hole of the cup member and the fitting outer face of the shaft member are constituted by a joining part having a space and a press-fitting part having interference, the axial direction dimension of the joining part is longer than the axial direction dimension of the press-fitting part, and the joining part acts as a press-fitting guide. |
