Patent ID: 9573618
Date: 2017-02-21
CPC Classifications: B62D,F16H

Claim:
1. A ball screw comprising: a nut; a screw shaft at which a spiral groove is formed at an outer peripheral surface of the screw shaft; an end deflector attached to the nut; plural balls rolling along the spiral groove; and a pair of ball lifting portions provided at the end deflector so as to interpose a width center of the spiral groove between the pair of ball lifting portions, wherein the pair of ball lifting portions supports the balls by a first part of one of the pair of ball lifting portions and a second part of other of the pair of ball lifting portions being apart from each other in a width direction of the spiral groove, and wherein a distance between the first and second parts is configured to become narrower in a traveling direction of the balls so as to lift the balls from the spiral groove.