| 摘要 |
<p>PROBLEM TO BE SOLVED: To maintain a clean environment by preventing splashing of the lubricant leaked from an end part of a ball nut to a circumference and to reduce consumption of a lubricant by making it possible to collect and reuse the lubricant. SOLUTION: This ball screw device 10 is furnished with a screw shaft 13 with a spiral thread groove 12 on its outer peripheral surface, the ball nut 16 having a thread groove 14 corresponding to the thread groove 12 on an inner peripheral surface and fitted in the screw shaft 13 with a play, and a large number of balls 14 arranged free to roll between the both thread grooves 12, 14. A labyrinth seal 20 and a lip seal 30 to seal an end part of the ball nut 16 by separating them from each other in the axial direction in a state of arranging them inward in the axial direction are provided, and waste oil hole 40 to lead the lubricant leaked between each of the seals 20, 30 adjacent to each other from the end part of the ball nut 16 outside on the ball nut 16 is formed.</p> |
