| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a constant velocity universal joint reduced in cost by eliminating grinding work for an internal oxidation layer, and also improved in strength resulting in a longer rolling life (the life of a track groove). <P>SOLUTION: The constant velocity universal joint comprises: an outside joint member having a plurality of track grooves 22 formed in an inner diameter face 21; an inside joint member having a plurality of track grooves 25 formed in an outer diameter face 24; a plurality of balls 27 laid between the track groove 22 of the outside joint member and the track groove 25 of the inside joint member for transmitting torque; and a cage 28 laid between an inner diameter face 21 of the outside joint member and an outer diameter face 24 of the inside joint member for holding the balls 27. In the groove surface of the track groove 25 of at least the inside joint member, a forging finished hardened layer 35 is provided whose internal oxidation layer is 1μm or less thick. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
