Patent ID: 8062139

Claim:
A fixed constant velocity universal joint comprising: an outer member having an inner spherical surface, eight ball grooves extending in an axial direction of said outer member and being disposed on said inner spherical surface, and a plurality of frontal sections adjacent to said inner spherical surface on an outer member opening side, each frontal section of said plurality of frontal sections being disposed between adjacent ball grooves on said outer member; an inner member having an outer spherical surface, and eight ball grooves extending in an axial direction of said inner member and being disposed on said outer spherical surface; torque transmission balls incorporated between said eight ball grooves on said outer member and said eight ball grooves on said inner member so as to form eight pairs of ball grooves; and a cage interposed between said inner spherical surface of said outer member and said outer spherical surface of said inner member and holding said torque transmission balls in an axial direction of said cage, wherein: said frontal sections form a smallest inner diameter of an outer member opening, and two mutually opposing frontal sections are retracted from the smallest inner diameter in an outward radius direction by a predetermined distance so as to enable insertion of said cage through said two frontal sections in a state in which a cage axial line is perpendicular to an outer member axial line.