某乘用车齿条助力式转向系统设计毕业论文.doc

某乘用车齿条助力式转向系统设计 摘 要 本文以某款乘用车的齿条助力式转向系统为研究对象，首先分析了本课题研究的目的和意义，经过搜集大量资料并作分析后归纳出转向系统的特点和国内外发展状况。其次对其组成和工作原理进行了阐述，分析了电动助力转向系统的工作原理和类型，并对其关键部件进行解释说明，分析了其助力特性。然后重点进行了转向系统的结构参数设计计算，确定了转向系计算载荷，分析了转向系统的设计要求，并对关键部件进行了结构设计。接着对转向梯形进行了优化设计,给出了优化结果,并做了分析验证。最后对每个部件进行了三维实体建模，并对关键受力部件转向节进行了有限元分析，绘制了转向传动系统、转向操纵系统及主要零部件的工程图。 主要方法和理论采用汽车设计的经验参数和大学所学机械设计的课程内容进行设计，并做了归纳和总结。 关键词： Design of a Passenger Car With Rack Power steering System Abstract Automotive electric power steering system is a new type of vehicle power steering system, it is the key technology in the automobile field, which can save fuel. It is beneficial to the environment, the variable power steering, easy to achieve modular products etc. In this paper, system of a passenger vehicle rack power steering as the research subject, the steering system is studied in detail. In this paper, a passenger car rack power steering system is regarded as the research object, first it analyzes the purpose and significance of this research and summarizes the steering system characteristics and development status in domestic and abroad through data collection and analysis . Secondly it analyzes the working principle and the type system, and make explanation of its key component, and analyzes its characteristic. Then we calculated the structure parameters of the system design of steering, the steering system load calculation, analysis to the system design requirements, and the key components of the structural design. Then the optimization design of steering trapezoid, give out the optimization results, and make analysis and verification. At the end of each components of the three-dimensional entity modeling, and the key parts of the steering knuckleis analyzed by finite element analysis, draw the steering system, the steering system, and the main components of the engineering drawings. The main method and theory with experience in automotive design parameters and the university curriculum design of mechanical design, and make a sum up .