| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw capable of holding high lubricating performance for a long period. SOLUTION: A ring-shaped wiper member 7 pressed by a garter spring 8 to an external diametric surface 10 of a screw shaft 1 is mounted in both end parts of a nut 3 of a ball screw, grease 6 discharged from a screw groove 2 by a ball 5 according to movement of the nut 3 is returned into the screw groove 2 by the wiper member 7 moved from the backward, so as to hold always the grease 6 sufficient in the screw groove 2 of the screw shaft 1 in a location where the nut 3 comes to again.
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