| 摘要 |
PURPOSE:To reduce a rotational moment acting on a cage by a method wherein radii of curvature of ball grooves in both outer and inner joint members are continuously and gradually decreased from their opening side or deep side toward the deep side or opening side. CONSTITUTION:Since the ball grooves 11 and 12 arranged in both outer and inner joint members 10 and 20 are formed to have a curved line shape in which their radii of curvature are continuously and gradually decreased from either an opening side or a bottom side toward either the bottom side or opening side, when a twisting torque is loaded to the joint, the combined force F2 generated at the ball 30 positioned at the bottom part of the ball groove 11 of the outer joint member 10 shows the same direction as that of a combined force F1 generated at the ball 30 due to a relation in which a contact point C between the ball groove 11 of the outer joint member 10 and the ball 30 and a contact point C' between the inner joint member 20 and the ball 30 are positioned at the bottom side of the outer joint member 10, respectively, in respect to a central plane Y-Y of the joint, so the combined forces F1 and F2 are cancelled to each other and the rotational moment acting on a cage 40 is reduced. |
