| 摘要 |
<p>According to the present invention, thereis provided a ball screw (1) used under agitated oil lubrication comprising: a screw shaft (2) formed with a helical screw groove (2a) on its outer circumferential surface; a nut (3) adapted to be fitted on the screw shaft (2) and formed with a helical screw groove (3a) on its inner circumferential surface; a plurality of balls (4) contained in a rolling passage formed by oppositely arranged screw grooves (2a and 3a); and a bridge member (5) adapted to be fitted in a bridge window (6) formed through a barrel wall of the nut (3) and formed with a connecting groove (5a) bypassing the rolling passage to a radially outward circumferential passage; characterized in that a notch is formed in the bridge member (5) so as to intercommunicate the outer and inner circumferential portions of the nut (3).</p> |
