挂车是用于货物运输的重要工具,量大面广,轴总成又是挂车的关键部件,其质量好坏,直接影响挂车的使用性能。在产品的实际应用中,我们发现7C—3挂车轴总成的原设计结构不尽合理:1)其轴体材料采用ф75mm的45钢,功能有余,且浪费钢材,仅按年产3000台计算,浪费钢材50余吨;2)轴体的关键部位ф50mm Trailer is an important tool for the transport of goods, a large amount of large, shaft assembly is the key component of the trailer, the quality of its bad, directly affect the performance of the trailer. In the actual application of the product, we found that the original design structure of the 7C-3 trailer axle assembly is not reasonable: 1) Its shaft material uses ф75mm 45 steel with more functions and wastes the steel only by an annual output of 3000 units , Wasting more than 50 tons of steel; 2) the key parts of the shaft ф50mm