Patent ID: 8747237

Claim:
A sliding ball type constant velocity joint for a vehicle, comprising: an outer race rotating by receiving rotational power from an end of a shaft and having a track groove pair formed by a pair of track grooves on its inner surface, the outer race including a cylindrical inner surface formed between adjacent track groove pairs and defining an are length that is constant in an axial direction and is larger than an are length defined by a cylindrical inner surface formed between a pair of track grooves; an inner race installed in the outer race having a track groove pair formed by a pair of track grooves on its outer surface to correspond to the track groove pair of the outer race; a plurality of balls installed in the track groove pairs formed in the outer race and the pair of track grooves formed in the inner race, for transmitting the rotational power of the outer race to the inner race; and a cage having windows, each window being sized and configured for accommodating and supporting two of the balls; wherein in the inner race, a spherical outer surface formed between adjacent track groove pairs comes into contact with a spherical inner surface of the cage, while a spherical outer surface formed between a pair of track grooves does not come into contact with a spherical inner surface of the cage.