中文摘要：

对DJ1型机车一系弹簧断裂原因进行分析，认为机车一系弹簧直接承受轮对的冲击，工作条件较为恶劣，一系弹簧疲劳寿命除与弹簧本身质量有关外，还与弹簧的动荷系数取值密切相关，而动荷系数的取值与机车运用线路条件、机车的悬挂方式、机车运行速度及机车牵引负荷有关。不同线路条件应取不同的安全系数，以保证一系弹簧的工作寿命。

英文摘要：

The reason of the rupture of first spring of DJ1 type locomotive has been analyzed. The first spring of locomotive endures the impact of wheel-set directly and its working environment is very bad. The fatigue life of the first spring is connected with both the spring＇s quality and the spring＇s dynamic load coefficient. The dynamic load coefficient is dependent on line condition, suspension mode, velocity and load. The security coefficient must be selected according to the line condition in order to ensure the working life of the first spring.