| 摘要 |
PURPOSE: An electric steering device for a vehicle is provided to prevent the tilting of an end cap in motion although the ball member is laterally shaken and to compensate a gap between the end cap and a ball nut part. CONSTITUTION: An electric steering device for a vehicle(100) comprises a ball nut part(110), a ball member(120), an end cap(130), and a tilting prevention part(140). The ball nut part is rotated by a driving motor and is engaged with a screw rack bar(50). A spiral first groove part(111) to which the movement of the ball member is arranged on the interior of the ball nut part. A spiral second groove part(132) to which the movement of the ball member is in a state of being engaged with the first groove is arranged on the exterior of the screw rack bar. The ball member is installed between the ball nut part and the screw rack bar and reduces friction. The end cap is arranged in the inner side of the ball nut part and guides the ball member to the ball nut part. The tilting prevention part is arranged in the ball nut part and the end cap and prevents the tilting of the end cap. |
