| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw device which can reduce heat generation due to the friction of a lubricant containing body in contact with a screw shaft, and can stably supply a lubricant for a long time while suppressing friction heat, especially even in the application with a high speed or a high load.SOLUTION: In a ball screw device 20 having a screw shaft 3 and a nut 1 engaged with the screw shaft 3 via a plurality of balls 6, a lubricant containing body 8 which contacts with an outer peripheral surface of the screw shaft 3 and supplies a lubricant is provided, and cooling passages 25-28 are formed so that a cooling liquid flows in at least one of the nut 1 and the screw shaft 3. |
