| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw mechanism which is excellent in response, enables energy saving, and does not balk manual operation even when trouble or the like occurs. SOLUTION: Since ball screws 2a, 1a and a ball 3 have a spaceΔin the axial direction, the energizing force of a detent panel 47 which energizes the detent position can be reduced in the case where the ball 3 is made to stand still in either of a plurality of detent positions which are placed at predetermined intervals, and energy saving can be achieved. Since the dynamic torque of the ball screw mechanism is small when it has to be manually driven because of an electrical system trouble or the like, the ball screw mechanism can be manually driven. COPYRIGHT: (C)2009,JPO&INPIT
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