Dump semi-trailer in the design must understand the user's maximum load,the type of cargo, road conditions and use of the environment, etc., so that the market segments, in the structural design stage is necessary to implement the serialization of products designed to respond to different needs. Overhang and axle load, the wheelbase and tread, the stringer strength design, the height of the bearing surface, tractors and semi-trailer semi-trailer dovetail of height and poor key factor in addition to the key consideration in the design; should also consider the following several aspects: the preparation of the product model, lightweight design, product design series, only considering the above problems, rational planning, the transfer of user satisfaction in order to design products.%自卸半挂车在设计时一定要了解用户的需求，充分了解最大装载量、装载货物的类型、道路条件和使用环境等情况，做到细分市场，在结构设计阶段就要推行产品系列化设计以应对不同的需求。在设计时除了重点考虑前悬及轴荷、轴距及轮距、纵梁强度设计、承载面高度、牵引车与半挂车相接合后半挂车的前后高度差等关键因素外；还应考虑以下几个方面的问题：产品型号的编制、轻量化设计、产品设计的系列化，只有综合考虑以上问题，进行合理的规划，才能设计出让用户满意的产品。
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