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内燃机车柴油机的曲轴是用合金钢或高强度球墨铸铁制造的。由于对曲轴采用氮化处理以及非氮化的圆根部分采川滚压强化处理,因而使结构上应力集中、强度较弱的截面(圆根和润滑油孔的截面)具有足够的强度储备。当铸造曲轴的总载荷量提高时,曲轴的循环强度往往不是由这些传统的危险截面所决定,而是由曲柄臂端面附近内腔应力较小的部位所决定,因为这些部位的铸造表面的抗疲劳强度较低。
Diesel crankshaft diesel locomotive is made of alloy steel or high-strength ductile iron. Due to the nitrocarburizing of the crankshaft and the non-nitrided root part of the rolling edge of the rolling strengthening treatment, so that the structural stress concentration, strength of the weaker section (round root and oil hole cross-section) has sufficient strength reserves. As the total load on the cast crankshaft increases, the cycle strength of the crankshaft is often not determined by these conventional dangerous cross-sections, but rather by the lesser stresses in the cavity near the end face of the crank arm, since the casting surface resistance Low fatigue strength.