Electronic power steering apparatus

An electronic steering device, comprising:

• an output shaft rotated by a reduction gear connected to a drive motor;
• a ball screw rotatable in conjunction with said output shaft, wherein said ball screw has an upper end coupled to a lower end of said output shaft, and wherein said ball screw has outer peripheral screw threads formed on an outer peripheral surface thereof;
• a ball nut having gear teeth formed on an outer peripheral surface thereof and inner peripheral screw threads formed on an inner peripheral surface thereof, wherein said inner peripheral screw threads correspond to said outer peripheral screw threads, wherein said ball nut is coupled to said ball screw via a ball, and wherein said ball nut slides in an axial direction;
• a sector shaft coupled to said gear teeth of said ball nut for operating a pitman arm by rotating while said ball nut slides in an axial direction;
• one or more rotation supports disposed between a housing and the ball screw to support rotation of the ball screw;
• and
• an axial support having an elastic member configured to generate an elastic force in a circumferential direction to support one of the rotation supports in the axial direction, wherein the one or more rotation supports disposed between the housing and the ball screw are coupled between the ball screw and the axial support and directly coupled to the ball screw,
• wherein said axial support comprises:
• a first support member equipped with a first support part protruding from an outer peripheral surface in the axial direction having a protrusion increasing in the circumferential direction, and inserted into an inner peripheral surface of a lower end of said housing to support the rotation support in the axial direction;
• and
• a second support member protruding in a shape corresponding to said first support member and having a second support part engaged with said first support part, and coupled to an inner peripheral surface of a lower end portion of said housing, and
• wherein the elastic member is disposed between said first support member and said second support member, and one end of the elastic member is coupled to said first support member and another end of the elastic member is coupled to said second support member to generate the elastic force in a peripheral direction.