Sliding ball type constant velocity joint for vehicle

A sliding ball type constant velocity joint for a vehicle, comprising:

• an outer race having grooves formed therein;
• an inner race installed in the outer race;
• a plurality of balls for transmitting the rotational power of the outer race to the inner race;
• and
• a cage for supporting the balls, the cage being disposed about a central axis and having an inner arcuate surface interfacing the inner race, the cage including at least one opening extending into the cage from the inner arcuate surface for receiving at least one of the balls, the inner arcuate surface defining a continuously arcuate segment along the entire opening in a cross sectional plane extending along the central axis;
• wherein a center of a radius of an outer arcuate surface of the inner race is formed at a different location from a center of a radius of the inner arcuate surface of the cage, the outer arcuate surface of the inner race is divided into two sections having different radii, the centers of the radii of the two sections of the outer arcuate surface of the inner race are formed at locations axially moved from the center of the radius of the inner arcuate surface of the cage, and one of the centers of the radii of the two sections of the outer arcuate surface of the inner race is formed at a location radially moved from the center of the radius of the inner arcuate surface of the cage.