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我厂生产的6130×150柴油机,最大功率200马力,最关键的零件是曲轴。它不仅承受交变载荷,且高应力集中,故要求该曲轴具有很高的弯曲疲劳强度和扭转疲劳强度。由于此曲轴原来是6120×140柴油机上的,后柴油机改型,缸径加大,冲程加长,但曲轴尺寸仍未改变。这样相对的强度降低了约7.0%,安全系数不足,经计算(1)仅0.94。一般认为在1.3～1.6范围内是安全可靠的。显然强度不足,而在发动机运行中也曾发生过疲劳断裂现
I plant 6130 × 150 diesel engine, the maximum power of 200 horsepower, the most critical part is the crankshaft. It not only withstand alternating loads, and high stress concentration, it requires the crankshaft with high bending fatigue strength and torsional fatigue strength. Since this crankshaft was originally 6120 × 140 diesel engine, after the modified diesel engine, increased bore, stroke longer, but the crankshaft size has not changed. This relative reduction of about 7.0% in strength, lack of safety factor, calculated (1) only 0.94. Generally believed that in the 1.3 ~ 1.6 range is safe and reliable. Obviously the lack of strength, and in the engine operation has also occurred fatigue fracture