Patent ID: 7214134

Claim:
A fixed constant velocity universal joint comprising: an outer ring having a plurality of track grooves extending axially in an inner spherical surface thereof; an inner ring having a plurality of track grooves extending axially in an outer spherical surface thereof; torque transmission balls arranged in ball tracks formed by cooperation of the track grooves of the outer ring and the track grooves of the inner ring; and a cage having pockets for retaining the torque transmission balls, wherein: the center of the track grooves of the outer ring and the center of the track grooves of the inner ring are offset from the spherical center of the inner spherical surface and the spherical center of the outer spherical surface, respectively, by the same distance axially in opposite directions; an axial clearance between the pockets and the torque transmission balls is set within a range of −0.006 and −0.035 mm; and a radial clearance between the cage and the inner ring is set so that a clearance-to-diameter ratio falls within a range of 0.9 and 2.3.