车辆毕业设计-转向柱式电动助力转向系统设计.pdf

摘 要 电动助力转向系统就是在机械转向系统中,用电池作为能源, 电动机为动力, 以 转向盘的转速和转矩以及车速为输入信号, 通过电子控制装置, 协助人力转向, 并获 得最佳转向力特性的伺服系统。EPS汽车转向系统的性能直接影响到汽车的操纵稳定 性, 对于确保车辆的安全行驶、减少交通事故以及保护驾驶员的人身安全、改善驾驶 员的工作条件起着重要的作用。 电动助力转向系统主要由减速机构和转向机构组成，减速机构把电动机的输出经 过减速增扭传递到动力辅助单元，实现助力。由于蜗轮蜗杆传动比大，传动平稳噪声 低故减速机构选为蜗轮蜗杆式。由于齿轮齿条式转向器，传动平稳，结构简单故转向 机构选为齿轮齿条式。 本文设计研究了电动助力转向系统，对其工作原理做了阐述，对蜗轮蜗杆减速器 中的蜗轮与蜗杆做了详细的设计计算，并进行了选型。同时对齿轮齿条式转向器的结 构进行分析，并对其重要零件进行了设计计算与强度校核。 关键字：减速器；转向器；设计；齿轮；轴；校核 ABSTRACT Electric power steering system is in mechanical steering system, use battery as energy, motor as a driving force, the steering dish speed and torque and speed of the input signal, through the electronic control unit, to help the human steering, and get the best to force characteristics of servo system. EPS automobile steering system performance directly influence to the cars steering stability, to ensure that the vehicles safety driving, reduce the number of traffic accidents and protecting the personal safety of the driver, improve the working conditions of the driver plays an important role. Electric power steering system mainly consists of deceleration institutions and steering mechanism composition, slowing institutions to increase the output after slowing motor relay to the power auxiliary units twisted, realize the power. Because worm transmission large and stable transmission low noise so slow institutions elected worm type. Because rack-and pinion steering gear-component with simple structure, stable transmission, is steering mechanism selected for rack-and pinion type. The paper presents the design of electric power steering system was studied, the principle of work of worm gear and worm reducer elaboration, the worm gear and worm to do a detailed design calculation, an