发动机曲轴在工作时,受到内燃机周期性变化的气体压力、曲柄连杆机构的惯性力、扭转和弯曲应力以及冲击力等作用,同时还存在复杂的扭转振动。因此要求曲轴具有高强度、一定的冲击韧性和弯曲、扭转疲劳强度,轴颈还要有高的耐磨性。曲轴强化一般有四种方法:提高材质的强度,轴颈和圆角表面淬火,轴颈表面淬火 Engine crankshaft at work, by the internal combustion engine cyclical changes in gas pressure, crank rod mechanism inertial force, torsion and bending stress and impact, and so on, but also there are complex torsional vibration. Therefore, requiring crankshaft with high strength, a certain impact toughness and bending, torsion fatigue strength, but also high journal wear resistance. Crankshaft reinforcement generally has four ways: to improve the strength of materials, journal and fillet surface hardening, journal surface hardening