| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball screw device of a simple structure enabling easy and appropriate installation of circulation member, and an electric power steering device. <P>SOLUTION: In the ball screw device, a pair of mounting holes 15a, 15b passing through a ball screw nut 13 in radial directions are formed, and a return hole 17 as a through hole extended in an axial direction of the ball screw nut 13 and opening to axially end parts 13a, 13b and each mounting hole 15a, 15b is formed, on the ball screw nut 13. The return hole 17 passes through the ball screw nut 13 in the axial direction, and a reflux path L2 is formed by connecting the return hole 17 and a rolling path L1 by the circulation member 16 installed on each mounting hole 15a, 15b. A hollow part 30 facing an opening part 17a of the return hole 17 opening to axial direction end parts 13a, 13b of the ball screw nut 13 when the circulation member 16 is appropriately installed to the mounting holes 15a, 15b is formed on the circulation member 16. <P>COPYRIGHT: (C)2010,JPO&INPIT |
