| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw device of a simple structure and low costs, with respect to the ball screw device including a seal for a ball screw capable of retaining a lubricant inside of a nut, and preventing intrusion of foreign matters into the nut.SOLUTION: A lip portion 41 of a seal 4 is composed of a groove contact part 41a kept into contact with a spiral groove 2a of a screw shaft 2, an outer peripheral contact part 41b kept into contact with an outer peripheral face 2b of the screw shaft 2, and connecting portions 41c connecting both parts 41a, 41b. A plurality of sheets of seals in which a tip of the groove contact part 41a is directed to the inside of the nut 1 in the axial direction, and a tip of the outer peripheral contact part 41b is directed to an outer side of the nut 1 in the axial direction, are mounted in an overlapped state. |
