| 摘要 |
Provided is a fixed type constant velocity universal joint capable of securing smooth rotation and reducing a load on a cage even at a large operating angle and at a time of bearing large torque. The fixed type constant velocity universal joint includes an outer joint member having opened one end and an inner spherical surface in which multiple track grooves are circumferentially formed in an axial direction; an inner joint member (15, 25) having an outer spherical surface (13, 23) in which multiple track grooves (14, 24) paired with the track grooves of the outer joint member are circumferentially formed in the axial direction and multiple outer spherical surface portions (19, 29) circumferentially arranged; multiple balls interposed between the track grooves of the outer joint member and the track grooves (14, 24) of the inner joint member (15, 25), for transmitting torque; and a cage interposed between the inner spherical surface of the outer joint member and the outer spherical surface (13, 23) of the inner joint member (15, 25), for retaining the balls. A spherical surface angle (± 10 , ± 20 ) of the outer spherical surface (13, 23) of the inner joint member (15, 25), which is positioned on a joint opening side, is set to 12.5° or more. |
