【摘要】 本文对一种液压随车起重用平面四杆机构的工作原理进行了研究与设计，对机构的平台的运动轨迹、速度、加速度及主支架的受力情况进行了详细的分析，并给出供设计用的有用数据。更多还原

【Abstract】 The paper deals with the working principal and construction of a quadric crank mechanism lift gate used for automobil. The kinamatics analysis on the moving track, speed, accelaration of the platform and the force analysis of the main frame are carried out in detail, some useful infomation for designing is given in the conclusion.更多还原