FIXED CONSTANT-VELOCITY UNIVERSAL JOINT

摘要

Track grooves (7) of an outer joint member (2) include first track groove portions (7a) and second track groove portions (7b). Each of the first track groove portions (7a) is formed into an arc shape having a curvature center at a position offset to an opening side with respect to a joint center. The first track groove portions (7a) are inclined in a peripheral direction of the outer joint member (2) with respect to a joint axial line (N-N) and adjacent to each other in the peripheral direction with their inclination directions opposite to each other. Each of the second track groove portions (7b) includes a linear part so as to increase an effective track length at a maximum operating angle, and is connected to the each of the first track groove portions (7a) at a position on the opening side with respect to the joint center (O). Track grooves (9) of an inner joint member (3) are each formed so as to be mirror-image symmetrical with corresponding one of the paired track grooves (7) of the outer joint member (2) with respect to a joint center plane (P) at an operating angle of 0°.