| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball screw device capable of reducing nonuniformity of rotational torque, by eliminating a biased gravity center balance of a ball nut. Ž<P>SOLUTION: This ball screw device has a ball screw shaft 11 forming a spiral ball rolling groove 11a on an outer peripheral surface and movable in the axial direction, the rotatable ball nut 12 forming a spiral ball rolling groove 12a opposed to the ball rolling groove of the ball screw shaft on an inner peripheral surface, a large number of balls 14 for rolling on a ball rolling track 13 formed between the respective ball rolling grooves of the ball screw shaft and the ball nut, and a return tube 15 for returning the balls to the other end side from one end side of the ball rolling track, and is provided with an installation seat 17 for installing the return tube at a predetermined interval on the circumference of the ball nut, and a plurality of partial cutoff processing parts 25 and 26 for stabilizing the gravity center balance of the ball nut. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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