BALL SCREW DEVICE, MECHANICAL COMPONENT MANUFACTURING METHOD, MECHANICAL DEVICE MANUFACTURING METHOD, VEHICLE MANUFACTURING METHOD, MECHANICAL COMPONENT, MECHANICAL DEVICE, VEHICLE, HYDRAULIC FORMING METHOD, AND FORMING DIE FOR HYDRAULIC FORMING

摘要

A ball screw device according to the present invention is provided with: a nut (3); a screw shaft; and a plurality of balls disposed between the nut (3) and the screw shaft. The nut (3) includes: a first member (11) disposed surrounding the screw shaft; a second member (10) disposed between the screw shaft and the first member (11); and a third member (12) disposed between the first member (11) and the second member (10). The third member (12) has a laminated body (12A) in which a plurality of plates (22a, 22b) are laminated in the axial direction. The laminated body (12A) has an inner surface that faces the outer surface of the second member (10). The inner surface of the laminated body (12A) has a shape that corresponds to the shape of the outer surface of the second member (10).