| 摘要 |
In a fixed type constant velocity universal joint(1), track grooves of an outer joint member comprise first track groove portions (7a) each located on a depth side and second track groove portions (7b) each located on an opening side. The first track groove portions (7a) each comprise a circular-arc part having a curvature center that is not offset in an axial direction with respect to a joint center (O). The first track groove portions (7a) are inclined in a circumferential direction with respect to a joint axial line (N-N), and are adjacent to each other in the circumferential direction with their inclination directions opposite to each other. The second track groove portions (7b) are each formed into a shape different from a shape of each of the first track groove portions (7a) so as to increase an effective track length with respect to a maximum operating angle. The first track groove portions (7a) and the second track groove portions (7b) are connected respectively to each other on the opening side with respect to the joint center (O). Each track groove of an inner joint member is formed to be mirror-image symmetrical with the paired track groove of the outer joint member with respect to a plane (P) comprising the joint center (O) at an operating angle of 0°. |
