Fixed type constant velocity universal joint

摘要

A fixed type constant velocity universal joint includes an outer joint member having an inner spherical surface in which a plurality of track grooves extending in an axial direction are formed; an inner joint member having an outer spherical surface in which a plurality of track grooves extending in the axial direction while paired with the track grooves of the outer joint member are formed. A plurality of balls are interposed between the track grooves of each of the outer joint member and the inner joint member, for transmitting a torque, and a cage is interposed between the inner spherical surface of the outer joint member and the outer spherical surface of the inner joint member, for holding the balls. The outer joint member and the inner joint member each have a center curvature of the track grooves being offset from each other in a direction opposite to the axial direction by an equal distance with respect to a joint center, in which: a PCD gap (2×m) in a ball track formed between the track grooves of each of the outer joint member and the inner joint member is set to equal to or larger than 25μm.