Patent ID: 7025685
Filing Date: 2006-04-11
Classification: B60B,B60K,F16D,Y10S

Abstract:
1. A constant velocity universal joint comprising an outer joint member including a bowl-shaped mouth portion and a stem portion with a serration formed on an outer peripheral surface thereof, the stem portion extending from a bottom portion of the mouth portion in an axial direction, wherein an induction hardened area is formed locally in an area in the bottom portion of the mouth portion of said outer joint member, and is formed on a surface substantially perpendicular to the axial direction in which the stem portion extends, and wherein another induction hardened area is formed in a base portion of said stem portion, and an unhardened area remains sandwiched between the induction hardened area in said base portion of said stem portion and the induction hardened area in the bottom portion of said mouth portion.