Patent ID: 7137895

Claim:
A tripod type constant velocity joint comprising a hollow housing fixed to the end of a first rotary shaft and formed 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 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 peripheral surface of the inner roller through needle rollers, wherein the outer roller is received in the recessed grooves in the housing and is rollable axially of the housing, each recessed groove comprising guide surfaces contacting the outer peripheral surface of the outer roller and subjected to loads and guide shoulder surfaces for guiding the outer roller axially of the housing, and a relief is locally formed along a forged parting line of the trunnion journal, thereby receding a protuberance of the parting line inwardly from the outer peripheral surface of the trunnion journal.