POWER STEERING DEVICE

摘要

First and second load transition regions VL1 and VL2 are provided in first and second regions of a nut-side ball screw groove 42b, which are located within first and second predetermined ranges along the nut-side ball screw groove 42b from the other-end openings of first and second connecting passages 50 and 60. The first and second load transition regions are configured so that the load received from the nut 41 side by balls 43 located in the first and second regions is transmitted to a rack shaft 7, and so that the radial distance (rack shaft center distance) RL between the rotary shaft of the nut 41 and the nut-side ball screw groove 42b gradually increases toward the other-end openings of the first and second connecting passages 50 and 60.