| 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 pair of bearing devices 101A, 101B which supports a ball shaft 110 of the ball screw 10. Multiple first cooling through holes 170 which penetrate through a housing 130 in an axial direction of the housing 130 and allow a cooling medium to pass are formed in the housing 130 of the bearing device 101A. A second cooling through hole 271 which penetrates through a housing 230 in a radial direction and allows the cooling medium to pass is provided in the housing 230 of the bearing device 101B. A third cooling through hole 272 which allows the cooling medium to pass along an axial direction of the screw shaft 110 and a fourth cooling through hole 273 which connects the second cooling through hole 271 with the third cooling through hole 272 are formed in the screw shaft 110. |
