| 摘要 |
<p>Provided is a fixed type constant velocity universal joint capable of obtaining, in every angular region, wear resistance against rolling of balls and a stable high fatigue strength characteristic. The fixed type constant velocity universal joint includes: an outer joint member including an inner surface (21) in which a plurality of track grooves (22) are formed; an inner joint member including an outer surface (24) in which a plurality of track grooves (25) are formed; a plurality of balls (27) interposed between the track grooves (22) of the outer joint member and the track grooves (25) of the inner joint member so as to transmit torque; and a cage (28), which has pockets (29) for housing the balls (27), and is interposed between the outer joint member and the inner joint member. When a maximum operating angle is formed, the balls (27) roll up to track-groove-opening-end portions (22a) of the outer joint member. Each of the track grooves (22) of the outer joint member is provided with a hardened layer (S1) formed so as to extend from a track-groove deep side to the track-groove-opening-end portion, the hardened layer (S1) having a smaller thickness at the track-groove-opening-end portion (22a) compared with a thickness at other portions.</p> |
