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    • 10. 发明授权
    • Variable steering ratio steering system
    • 可变转向比转向系统
    • US06374693B1
    • 2002-04-23
    • US09558342
    • 2000-04-26
    • Yoshihiro KawabeYoshiteru Minagawa
    • Yoshihiro KawabeYoshiteru Minagawa
    • B62D306
    • B62D1/166B62D3/06Y10T74/1864Y10T74/1967
    • A variable-ratio steering system includes a steering shaft connected to a manually-operated handle, a ball nut engaging with the steering shaft and a ball-bearing-screw mechanism converting rotary motion of the steering shaft into axial displacement of the ball nut in the axial direction of the steering shaft. Also provided is a second motion converter which generates a rotational displacement of the ball nut about the axis of the steering shaft with the axial displacement of the ball nut. A steering pinion gear block is connected to the ball nut by means of serrations to rotate together with the ball nut. A rack is engaged with the pinion gear block and connected at both ends via knuckle mechanisms to steered wheels for varying a steer angle at the steered wheels depending on the displacement of the rack. The second motion converter having a variable steering ratio mechanism which varies a ratio of a rotational displacement of the ball nut about the axis of the steering shaft to the axial displacement of the ball nut to vary a steering ratio of steering wheel rotation angle to road-wheel steer angle.
    • 可变比转向系统包括连接到手动操作的手柄的转向轴,与转向轴接合的滚珠螺母和将转向轴的旋转运动转换成滚珠螺母的轴向位移的滚珠轴承螺杆机构 转向轴的轴向。 还提供了第二运动转换器,其产生滚珠螺母围绕转向轴的轴线的旋转位移,其具有滚珠螺母的轴向位移。 转向小齿轮块通过锯齿连接到滚珠螺母,与滚珠螺母一起旋转。 齿条与小齿轮组啮合,并通过转向节机构连接到转向轮,用于根据齿条的位移改变转向轮处的转向角度。 第二运动转换器具有可变转向比机构,其将滚珠螺母绕转向轴的轴线的旋转位移与滚珠螺母的轴向位移的比率变化,从而改变方向盘旋转角度与道路转向角度的转向比, 车轮转角。