The invention discloses an electric power steering device and a torque transmission mechanism thereof, and relates to the technical field of power transmission. The electric power steering device comprises a shell and a screw rod transmission assembly arranged in the shell, the screw rod transmission assembly comprises a screw rod, a steering nut, a screw rod nut and an output shaft, and the screwrod nut annularly sleeves the screw rod; the steering nut sleeves a periphery of the screw rod nut, the steering nut is meshed with the output shaft, a first gap is formed between the shell and the steering nut, and a second gap is formed between the steering nut and the screw rod nut; and due to the fact that the first gap is formed between the shell and the steering nut, the second gap is formed between the steering nut and the screw rod nut, and the width of the first gap is smaller than that of the second gap, the steering nut is in contact with the shell firstly, the shell provides a reverse acting force for the steering nut, the acting force is counteracted with a radial force, the screw rod nut is prevented from being affected by the radial force, and then the screw rod is prevented from deforming due to the influence of the radial force.

    本发明公开了一种电动助力转向装置及其扭矩传动机构,涉及动力传动技术领域,包括壳体和设于壳体内部的丝杆传动组件,所述丝杆传动组件包括丝杆、转向螺母、丝杆螺母以及输出轴,所述丝杆螺母环套在丝杆上,所述转向螺母套设在丝杆螺母的外周,所述转向螺母与输出轴啮合,所述壳体与转向螺母之间具有第一缝隙,所述转向螺母与丝杆螺母之间具有第二缝隙,由于壳体与转向螺母之间具有第一缝隙,转向螺母与丝杆螺母之间具有第二缝隙,且第一缝隙的宽度小于第二缝隙的宽度,使转向螺母先与壳体接触,壳体为转向螺母提供了反向的作用力,该作用力与径向力抵消,避免了丝杆螺母受到径向力的作用,进而避免了丝杆因受到径向力的影响发生变形。


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    Title :

    Electric power steering device and torque transmission mechanism thereof


    Additional title:

    电动助力转向装置及其扭矩传动机构


    Contributors:
    ZHU XINGWANG (author) / REN PEI (author) / WAN MINWEI (author) / ZHU SHENGFENG (author) / ZHU ZHONGMING (author)

    Publication date :

    2020-12-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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