| 摘要 |
A ball screw apparatus includes: a screw shaft having a first screw groove in a spiral shape at an outer peripheral face thereof; a nut having a second screw groove in correspondence with the first screw groove at an inner peripheral face thereof and screwed to the screw shaft; a number of balls rollably charged to an interval between the first screw groove and the second screw groove; a rolling bearing outwardly fitted on the nut; and a sleeve disposed between the nut and the rolling bearing. |
