Patent ID: 7153213

Claim:
A fixed type constant velocity joint characterized by comprising: a cylindrical joint outer ring having an inner spherical surface formed with a plurality of circumferentially equispaced axially extending track grooves, a joint inner ring having an outer spherical surface formed with circumferentially equispaced axially extending track grooves paired with the track grooves in the joint outer ring, a plurality of torque transmitting balls disposed in ball tracks defined by cooperation between the track grooves in the joint outer and inner rings, and a cage for holding the torque transmitting balls disposed in said ball tracks, wherein a center of curvature of the track grooves in the joint outer ring and a center of curvature of the track grooves in the joint inner ring are axially offset by the same distance with respect to a center of the fixed type constant velocity joint, each of the track grooves in the joint outer ring has an arcuate bottom in a mouth innermost side of the joint outer ring, and a straight bottom on a mouth opening side of the joint outer ring, each of the track grooves in the joint inner ring has an arcuate bottom on the mouth opening side of the joint outer ring, and a straight bottom on the mouth innermost side of the joint outer ring, and a rear open end of said joint outer ring opposite to the mouth opening side of said joint outer ring has an inner diameter larger than an outer diameter of the joint inner ring, an inner diameter surface of said cage is a surface having a shape such that a first region of the cage located forwardly of the center of the fixed type constant velocity joint is capable of controlling the forward movement of the joint inner ring while a second region of the cage located rearwardly of the center of the fixed type constant velocity joint is capable of allowing the axial movement of the joint inner ring.