Patent ID: 7097567

Claim:
A constant velocity universal joint, comprising: an outer joint member having eight curved track grooves axially extending along an inner circumferential surface with a spherical shape; an inner joint member having eight curved track grooves axially extending along an outer circumferential surface with a spherical shape; eight balls respectively arranged in eight ball tracks provided as pairs of the track grooves of the outer joint member and the track grooves of the inner joint member; and a cage having pockets for respectively holding the balls, a center of each track groove of the outer joint member being axially displaced a predetermined distance from a spherical center of the inner circumferential surface, a center of each track groove of the inner joint member being axially displaced the same distance from a spherical center of the outer circumferential surface in a direction opposite to that of the outer joint member, wherein a pitch circle diameter gap is in a range of 5 μm to 50 μm.