邵诗波;李学鹏;

1:天润曲轴股份有限公司2:济南鲍德汽车运输有限公司

    摘要：发动机曲轴在进行扭转疲劳试验过程中出现非正常疲劳裂纹,裂纹未从应力最集中的油孔处起源,造成曲轴扭转疲劳强度达不到设计要求。分析认为造成曲轴非正常扭转断裂的原因是油孔内壁存在加工沟槽,通过钻完油孔后采用旋转锉打磨,提高了曲轴的扭转疲劳强度。

    关键词： 曲轴;;扭转疲劳;;裂纹

    Abstract: During fatigue test of crankshaft,some cracks occur,but do not appear around the oil holes with strong stress,so the torque fatigue strength fails to meet the designed demand.It is founded the abnornal crack in the crankshaft is can used by the groove machined inside the oil hole wall.Grinding to the the finished oil hole is adapted and finally the torque fatigue strength has been improved.

    Keywords: Crankshaft;Torque Fatigue;Crack

参考文献：

[1]冯美斌,付斌,黄德锐.发动机球铁曲轴扭转疲劳强度的试验研究[J].汽车工艺与材料,2003,(7):12-14.

[2]冯美斌,徐家炽,王小培.电动谐振式曲轴扭转疲劳试验装置的研制[J].汽车工程,1995,(2):120-125.

[3]陈黄浦.大型柴油机曲轴断裂失效分析[J].机械工程材料,2007,31(9):76-78.