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摘要我国商用车的制造已经成熟化，在亚洲和非洲开辟出新市场。驱动桥作为商用车底盘中关键部分，其设计要精益求精。本设计对国产商用车福田欧马可5系底盘进行了分析，决定对其驱动后桥做优化设计。先查阅多本教材及图书馆参考书籍，对驱动桥内主要部分一一分析，选型后选择合理数据，计算校核。其次根据计算所得出的各零部件参数，用自己熟悉的制图软件绘制零件图，再自己设计出装配图。通过制图来找出自己在计算设计中的失误之处，修改所得参数并修改图纸。使用UG10.0辅助、三维建模，并用其自带高级仿真模块对桥壳有限元分析。本设计的驱动桥可以安装到大部分中型汽车上，对驱动桥的设计和优化做提供了案例。关键词：主减速器；桥壳；半轴；桥壳；驱动桥；有限元分析AbstractThe manufacture of commercial vehicles in China has matured and opened up new markets in Asia and Africa. As a important part of the chassis of a commercial vehicle, the drive axle must be designed critically.The design of the domestic commercial vehicle Futian Ouma 5 Series chassis was analyzed and it was decided to optimize the design of its rear axle. First consult multiple textbooks and library reference books, analyze the main parts of the drive axle one by one, select reasonable data after the selection, and calculate and verify. Secondly, according to the calculated parameters of each part, use the familiar drawing software to draw the parts drawing, and then design the assembly drawing by yourself. Use cartography to find out where your mistakes are in the calculation design, modify the resulting parameters, and modify the drawings. Use UG10.0 assisted, three-dimensional modeling, and use its own advanced simulation module for finite element analysis of the axle housing.The design of the drive axle can be installed on most medium-sized vehicles, providing a case for the design and optimization of the drive axle.Key words:Main reducer