Patent ID: 7682253

Claim:
A tripod type constant velocity joint comprising: a hollow cylindrical housing integrally formed at an 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 an inner peripheral surface; a tripod consisting of a boss fixed to an end of a second rotary shaft, and end-spherical trunnion journals radially projecting from circumferentially trisectional positions on the boss, wherein one of flat surfaces and dents are formed at load-imposed positions on the spherical outer peripheral surface of the trunnion journal; and roller assemblies, each roller assembly consisting of 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 rollers are received in the recessed grooves in the housing and roll axially within the housing, each recessed groove consists of 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 within the housing, and wherein the trunnion journals radially project from an outer surface of said boss that is chamfered more on a side of the tripod from which the second rotary shaft extends axially away from the housing than on a side of the tripod from which the first rotary shaft extends axially away from the housing.