Patent ID: 7785206

Claim:
A fixed constant velocity universal joint comprising: an outer joint member having eight axially extending arcuate ball grooves formed in a spherical inner surface thereof; an inner joint member having eight axially extending arcuate ball grooves formed in a spherical outer surface thereof; eight balls interposed between said ball grooves of said outer joint member and said ball grooves of said inner joint member for transmission of torque; and a cage, interposed between said outer joint member and said inner joint member, retaining said balls; wherein said ball grooves of said outer joint member have a center that is offset by a distance in an axial direction with respect to and on one side of the center of said spherical inner surface and said spherical outer surface, and said ball grooves of said inner joint member have a center that is offset by said distance in the axial direction with respect to and on an opposite side of the center of said spherical inner surface and said spherical outer surface; wherein said cage comprises pockets receiving said balls therein and bars separating said pockets from each other; wherein said bars have a cross-sectional area S comprising a hardened layer area and a non-hardened layer area C, having a Vickers hardness less than Hv513, and a ratio C/S is set to be 0.30≦C/S≦0.75; and wherein said cage has a thickness A, radial movement of said balls with respect to said cage at a maximum operating angle of said joint is B and 0.45≦B/A≦0.65.