Patent ID: 6602142
Filing Date: 2003-08-05
Classification: F16D

Abstract:
A constant velocity universal joint comprising:an outer joint member having three track grooves formed therein, each track groove has roller guide surfaces arranged circumferentially opposed to each other; a tripod member having three radially protruding trunnions; a roller fitted in a corresponding track groove; and a ring fitted on each trunnion for rotatably supporting said roller so that the roller is movable axially of the outer joint member along a corresponding roller guide surface, wherein an outer circumferential surface of said each trunnion has a straight shape, as viewed in a longitudinal section, and has, as viewed in a cross section, a shape which allows contact with an inner circumferential surface of said corresponding ring in a direction orthogonal to an axis of the outer joint member and allows creation of a gap between the outer circumferential surface of said each trunnion and the inner circumferential surface of said corresponding ring in an axial direction of the outer joint member, wherein said inner circumferential surface of said corresponding ring is shaped such that a diameter of said corresponding ring increases in a direction from an axial central portion of said corresponding ring to an end-face side thereof, and wherein a generatrix of the inner circumferential surface of each ring forms a part of an ellipse having a major axis extending in a direction orthogonal to the axis of said each ring.