本文论述了货车用“转8A型”三大件式转向架改进的主要途径:采用外弹簧定位以改进横向动力性能;两级刚度弹簧以提高静挠度;改善减振器各磨耗面的耐磨性及检修可靠性,使减振性能稳定并延长配件寿命。文中提出“小改”和“中改”两种方案,重点分析了两种方案样车与原型车曲线通过的动力学试验结果,并用稳态通过曲线的线性理论进行了电算。理论计算和试验数据都说明两种方案较原型有较明显的改进。 This paper discusses the main ways to improve the “Z8A” three-piece type bogie for trucks: the outer spring positioning to improve the lateral dynamic performance; the two-level stiffness spring to improve the static deflection; Reliability and reliability of maintenance, vibration damping performance and extend the life of accessories. Two schemes of “small change” and “medium change” are put forward in this paper. The dynamic test results of passing the curves of two prototypes and the prototype car are analyzed emphatically. The steady state is calculated by the linear theory of the curve. Both theoretical calculation and experimental data show that the two schemes have obvious improvements over the prototype.