Patent ID: 9291207
Filing Date: 2016-03-22
CPC Classification: F16D

Claim Text:
1. A constant velocity universal joint, comprising: an outer joint member having an inner peripheral surface comprising track grooves that are formed at a plurality of positions on the inner peripheral surface and extend in an axial direction; an inner joint member having an outer peripheral surface comprising track grooves that are formed at a plurality of positions on the outer peripheral surface and in pairs with the track grooves of the outer joint member, the track grooves of the inner joint member extending in the axial direction; torque transmitting members interposed between the track grooves of the outer joint member and the track grooves of the inner joint member; a track chamfer provided at each boundary portion between each of the track grooves of the outer joint member and the inner peripheral surface of the outer joint member; and a track chamfer provided at each boundary portion between each of the track grooves of the inner joint member and the outer peripheral surface of the inner joint member, wherein a surface hardness at least one of the track chamfer of the outer joint member or the track chamfer of the inner joint member is set to be lower than a surface hardness of each of the track grooves of the outer joint member and the track grooves of the inner joint member.