| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw keeping satisfactory circularity of balls for a long period. SOLUTION: An end cap 3 is provided with ball scooping-up parts 11 projecting in an external screw channel 5 of a screw shaft 1 for scooping up the balls 4. Ends 11a of the ball scooping-up parts 11 are formed in the shape of a curved surface as viewed in both a direction in which the balls 4 advance and an axial direction. COPYRIGHT: (C)2011,JPO&INPIT
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