Abstract: In commercial vehicle suspensions, leaf springs are the most widely used elastic components. In daily design, developers often focus more on the influence of vertical loads on leaf springs, while ignoring the influence of longitudinal impact on leaf springs in extreme working conditions. This article analyzes the longitudinal force of leaf springs when vehicles are subjected to longitudinal acceleration through examples, calculates their strength, and provides design considerations for leaf springs under longitudinal twisting conditions. In daily design, the design stress of the steel plate spring under vertical working conditions is 400～500 MPa, but under longitudinal torsional working conditions, it can be seen from the results that the stress of the front spring reaches 510.2 MPa, which is greater than the stress under vertical working conditions. Therefore, the stress generated by its longitudinal force should not be ignored.

Key words: Leaf spring; Longitudinal force; Condition analysis; Static load strength

摘要： 在商用车悬架中，钢板弹簧是应用最广泛的弹性元件，在日常设计中，开发人员往往 更关注垂直载荷对钢板弹簧的影响，而忽视了极限工况中纵向冲击对钢板弹簧的影响。文章 通过实例，分析车辆在受到纵向加速度时钢板弹簧的纵向受力，并计算其强度，以及钢板弹 簧在纵向扭曲工况下的设计注意事项。在日常设计中，针对钢板弹簧在垂直工况的设计应力 在 400～500 MPa，但纵扭工况下，从结果可以看出，前簧的应力达到了 510.2 MPa，比垂直 工况下的应力还大，因此，其纵向受力所产生的应力不应被忽视。

关键词: 钢板弹簧；纵向受力；工况分析；静载强度