Patent ID: 7357723

Claim:
A tripod type constant velocity joint comprising: a hollow cylindrical housing fixed to the end of a first rotary shaft and formed at the inner peripheral surface thereof with axially extending recessed grooves opened at one axial end and located at circumferentially trisectional positions on the inner peripheral surface, a tripod comprising a boss fixed to the end of a second rotary shaft, and end-spherical trunnion journals radially projecting from circumferentially trisectional positions on the boss, roller assemblies each comprising a an inner roller swingably fitted at the inner peripheral surface thereof on the spherical outer peripheral surface of the trunnion journal, and an outer roller supported for rotation and axial movement on the outer periphery of the inner roller through needle rollers, wherein the outer rollers are received in the recessed grooves in the housing and are rollable axially of the housing, each recessed groove comprising a guide surfaces contacting the outer peripheral surface of the outer roller and subjected to loads, and guide shoulder surfaces for contacting and guiding the outer roller axially of the housing, it being arranged that when the roller assembly is to be assembled to the trunnion journal, it is done so by tilting the roller assembly axially of the joint, the root of the tripod journal being of non-circular cross-section in which the diameter measured circumferentially of the joint is larger than the diameter measured axially of the joint, and wherein the outer shape of the torque load region of the trunnion journal is substantially double spherical.