OIL-CONTAINING POLYMER LUBRICANT BALL SCREW

摘要

PROBLEM TO BE SOLVED: To provide a long life ball screw capable of automatically supplying lubricating oil in a stable manner for a long time. SOLUTION: A ball screw nut 2 incorporating a number of balls 3 and engaged with a screw shaft 1 so as to be retatively rotated in a linear direction via the rolling movements of the balls 3 includes a lubricating oil-containing polymer member 10 brought into contact with the balls 3. Lubricating oil is gradually oozed out from the lubricating oil-containing polymer member 10 with the passage of time, and supplied to all of screw grooves 1b and 2b via the balls 3 to lubricate for a long time.