Patent ID: 8808098

Claim:
A constant velocity joint comprising: an outer race formed to a cylindrical shape with an opening portion on at least one axial side and including a plurality of outer race ball grooves on an internal surface thereof; an inner race arranged inside the outer race and including a plurality of inner race ball grooves on a peripheral surface thereof, wherein the groove bottom of each of the inner race ball grooves is a circular arc at one axial side of each respective inner race and is a substantially straight line at the other axial side of each respective inner race; a plurality of balls that roll on the respective outer race ball grooves and the respective inner race ball grooves and that transmit a torque between the outer race and the inner race; and a cage formed annularly, arranged between the outer race and the inner race, and including a plurality of window portions that respectively receive balls in a circumferential direction thereof; wherein on at least one of a plurality of groove wall protrusions that are configured by sidewall surfaces of adjoining ones of the inner race ball grooves, a first cutout is formed at the one axial side of the inner race and a second cutout is formed at the other axial side of the inner race, wherein a contact point locus between each of the inner race ball grooves and the balls that roll on the inner race ball grooves is located radially outward from groove bottoms of the respective inner race ball grooves, wherein an axial position where the second cutout on the other axial side is formed is provided at a location beyond the contact point locus in the axial direction toward the other axial side, wherein a radially inward bottom portion of each of the first cutouts is located radially outside of the contact point locus, and wherein a radially inward bottom portion of each of the second cutouts is located radially inside an extension of the contact point locus.