| 摘要 |
A ball screw ( 1 ) used under agitated oil lubrication has a screw shaft ( 2 ) formed with a helical screw groove ( 2 a) on its outer circumferential surface. A nut ( 3 ) is adapted to fit onto the screw shaft ( 2 ). The nut ( 3 ) has a helical screw groove ( 3 a) on its inner circumferential surface. A plurality of balls ( 4 ) is contained in a rolling passage formed between oppositely arranged screw grooves ( 2 a and 3 a). A bridge member ( 5 ) is adapted to fit into a bridge window ( 6 ) formed through a barrel wall of the nut ( 3 ). The bridge member ( 5 ) has a connecting groove ( 5 a) to enable the balls ( 4 ) to bypass the rolling passage to move into a radially outward circumferential passage. A notch is formed in the bridge member ( 5 ) to intercommunicate the outer and inner circumferential portions of the nut ( 3 ).
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