| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw device which can smoothly feed balls scooped up to the communicating hole of a nut main body without the displacement of the fixed positions of deflectors due to the collision of the balls. SOLUTION: A ball screw device comprises many balls 3 for carrying load between the ball transfer groove 11 of a screw shaft 1 and the load transfer groove of a nut main body, a ball return member fixed to the outer peripheral surface of the nut main body to circulate the balls from one communicating hole to the other communicating hole and a pair of deflectors 5 arranged so as to correspond the respective communicating holes of the nut main body, scooping up the balls from the ball transfer groove of the screw shaft and feeding them to the communicating hole. Further, each deflector comprises a ring shaped fixed part 51 fitted (to the opening edge part of the nut main body and a ball scooping up piece 52 which protrudes from the fixed part, is inserted into the nut main body along the load transfer groove when the fixed part is fitted to the nut main body and is positioned relative to the communicating hole. |
