| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw device capable of preventing a ball holding piece from being hooked even when the filling rate of the ball holding piece in a ball circulation route is small. SOLUTION: Ball pick-up parts 15 and 16 picking up balls 6 rolling between a screw shaft 1 and a ball screw groove of a nut 2 along a tangential line S in contact with a center route circle BC for the balls are formed on a ball circulation member 12 installed on the outer surface of the nut 2. The passage length L of a ball pick-up part 19 formed on the ball pick-up parts 15 and 16 is set to 1/2 of the diameter of the ball 6 or longer. COPYRIGHT: (C)2006,JPO&NCIPI |
