| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw device including a cooling mechanism capable of efficiently cooling a bearing device for supporting a screw shaft of a ball screw or an area near the bearing device.SOLUTION: A ball screw device 1 includes: a ball screw 10; and a bearing device 101 which supports an end part of a screw shaft 110 of the ball screw 10. The bearing device 101 includes a housing 130 which rotatably supports the screw shaft 110. A first cooling through hole 171 which penetrates through the housing 130 in a radial direction and allows a cooling medium to pass is provided in the housing 130. A second cooling through hole 172 which allows the cooling medium to pass along an axial direction of the screw shaft and a third cooling through hole 173 which connects the first cooling through hole 171 with the second cooling through hole 172 are formed in the screw shaft 110. |
