毕业设计论文-帕萨特转向系的优化设计 .doc

帕萨特转向系的优化设计 汽车在行驶过程中，需按驾驶员的意志经常改变其行驶方向，即所谓汽车转向。就轮式汽车而言，实现汽车转向的方法是驾驶员通过一套专设的机构，使汽车转向桥上的车轮相对于汽车纵轴线偏转一定角度。因此汽车转向系统的功用是保证汽车能按驾驶员的意志而进行转向行驶。 目前在所有前置-前轮驱动轿车上采用的都是齿轮齿条式转向器，一些前置-后轮驱动轿车也采用这种转向器。而电动助力转向系统是目前乘用车最为广泛使用的助力形式。故本文以动力转向系统中的齿轮齿条式电动助力转向系统为主要研究对象。 本文以帕萨特车型的转向系统为研究对象，设计的主要内容是：首先分析了本课题研究的目的和意义，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。设计转向系中转向器和转向传动机构，并进行三维建模，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，在此基础上使用  Optimization design of Passat steering system Abstract Car in motion the process, they are subject to change its driver will often travel direction, the so-called steering. For wheeled vehicles, the steering method is to realize the driver through a dedicated agency, making the car steering axle on the wheel with respect to the longitudinal axis of the deflection angle car. Therefore, the function of steering system is to ensure that cars can be carried out according to the will of the drivers steering with. Present in all front - wheel drive cars are used in rack and pinion steering, some of the front - rear-wheel drive sedan also used this steering. The EPS system is currently the most widely used power passenger form. Therefore, in this paper, power steering rack and pinion power steering system as the main object of study. In this paper, Passat car steering system is regarded as the research object: First it analyzes the purpose and significance of this research and summarizes the steering system characteristics. 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. At the end of each components of the three-dimensional entity modeling. Draw the steering system, the steering system, and the main components of the engineering drawings. The optimization design of steering trapezoid, give out the optimization results, and make analysis and verifica