以下为句子列表：
英文: Abstract: This paper analysed the kinematic properties of ball joint hi nged on the piston rod and steering drag link of a separated assistant steering m echanism, and the equations of the path and mathematical model of pressure angle were established.
中文: 文摘:分析了分置式转向助力机构的液压缸活塞杆与转向直拉杆相铰接的球头销的运动特性，建立了其轨迹方程及压力角的数学模型。
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