| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a ball screw in which load distributions of balls in a nut are equalized in an axial direction so as to be suitably usable even in a place with limited installation space.SOLUTION: A ratio (γ=S1/S2) of a cross-sectional area S1 perpendicular to the axial direction of a cylindrical part 11 of a nut 1 and a cross-sectional area S2 perpendicular to the axial direction of a screw shaft 2 is greater than 1.0, but not more than 5.0. This ball screw is used by securing one end of the screw shaft 2 in the axial direction thereof, and by disposing the side of a flange part 12 on the side of a stationary part 6 of the screw shaft 2.</p> |
