The present invention relates to a rack-driven power assist steering apparatus. According to the present invention, the rack-driven power assist steering apparatus comprises a ball nut receiving torque of a motor to rotate and having an inner circumference screw groove on the inner circumferential surface; and a rack bar having an outer circumference screw groove formation part in which an outer circumference screw groove is formed on the outer circumferential surface to be coupled to the ball nut using a ball, wherein the outer circumference screw groove is formed by connecting a first curved surface part and a second curved surface part and the rack bar is formed in such a way that a contact angle, formed by a line perpendicular to a tangential line where a ball is tangential to the first curved surface part and a line perpendicular to a tangential line where a ball is tangential to the second curved surface part, decreases from a center part of the outer circumference screw groove to both ends, which lowers friction generated during rolling motion of the ball in a center of the outer circumference screw groove formed in the rack bar and disperses external force in a vertical direction, transferred to the ball from both ends of the outer circumference screw groove formed in the rack bar.

    본 발명은 랙구동형 동력 보조 조향장치에 관한 것으로, 모터의 회전력을 전달받아 회전하며 내주면에 내주스크류홈이 형성된 볼너트 및 외주면에 외주스크류홈이 형성된 외주스크류홈 형성부가 구비되어 볼너트와 볼을 매개로 결합되되, 외주스크류홈은 제1곡면부와 제2곡면부가 연결되어 형성되고, 제1곡면부에 볼이 접하는 접선에 수직인 선과 제2곡면부에 볼이 접하는 접선에 수직인 선이 이루는 접촉각이 외주스크류홈 형성부의 중심부에서 양단부로 갈수록 작아지게 형성되는 랙바를 포함하여 랙바에 형성되는 외주스크류홈의 가운데에서 볼의 구름운동시 발생되는 프릭션을 낮추며, 랙바에 형성되는 외주스크류홈의 양단부에서 볼에 전달되는 수직방향 외력을 분산시킨다.


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    Title :

    Rack Assist Type Power Steering Apparatus


    Additional title:

    랙구동형 동력 보조 조향장치


    Contributors:

    Publication date :

    2017-02-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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