CONSTANT VELOCITY UNIVERSAL JOINT

摘要

A constant velocity universal joint that allows skipping of any grinding operation for intergranular oxide layer to thereby attain cost reduction, and that excels in strength and enables prolongation of rolling life duration (life duration of track groove). There is provided a constant velocity universal joint wherein forge finished hardened layer (35) of 1 µm or less intergranular oxide layer is disposed on at least the surface of track groove (25) of inside joint member.