| 摘要 |
PROBLEM TO BE SOLVED: To improve operational responsiveness in the ball screw apparatus while maintaining a situation where a nut member or a screw shaft are forced to stop by means of physical abutment in a predetermined position in a retracting direction, the nut member and the screw shaft may be rapidly separated without resistance when moving from the stop position to the expanding direction. SOLUTION: In a structure wherein the nut member 2 disposed on the outer circumference side of the screw shaft 3 is supported, via a bracket 8, on a shaft body 12 inserted into a center hole of the cylindrical screw shaft 3, for the bracket 8 and the screw shaft 3 internal with the nut member 2, a stopper pin 18 for forcibly stopping the nut member 2 in the predetermined position in the retracting direction and a notch 19 are independently provided and the stopper pin 18 and the notch 19 are disposed in contact with each other in the peripheral direction, to thereby prevent the stopper pin 18 and the notch 19 in a stop state from engaging with each other as in a conventional example so as to easily separate.
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