Patent ID: 9610659
Date: 2017-04-04
CPC Classifications: B23P,B62D,Y10T

Claim:
1. A steer-by-wire vehicle steering system that converts rotative power of an electric motor into a movement of a steered shaft in an axial direction via a ball screw mechanism, the vehicle steering system comprising: a threaded shaft provided at an intermediate part of the steered shaft; a ball nut screwed to the threaded shaft via balls and rotatable together with a rotor of the electric motor; a tubular housing that houses the electric motor and the ball nut and through which the steered shaft is passed; and first and second stoppers arranged at first and second end portions of the housing, respectively, wherein the steered shaft has first and second contact portions located respectively at first and second end portions of the threaded shaft, radial gaps are formed between outer peripheries of the respective contact portions and an inner periphery of the rotor so that the each of the contact portions is allowed to be inserted into the rotor, and when the steered shaft moves in the axial direction, one of an end face of the contact portions, which is on a moving direction side and passed through the rotor, contacts an end face of a corresponding one of the stoppers, so that a travel amount of the steered shaft in the axial direction is restricted.