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通过观察在无其它事故情况下机车运行中发生曲轴折断事故的曲轴断口，找出断口初生裂纹形成及扩展区、次生裂纹形成及扩展区和一次性折断区，并以此为依据推断初生裂纹产生、次生裂纹形成扩展的诸原因，提出了防止措施。
By observing the crankshaft fracture of the crankshaft in the locomotive without any other accident, the formation and propagation of primary cracks, the formation and propagation of secondary cracks and the one-off fracture zone were found out and the primary cracks were deduced Produced, the formation of secondary cracks, the reasons for the expansion, put forward preventive measures.