【大功率中速柴油机连杆轴瓦故障对曲轴可靠性的影响】唐少辉.pdf

【大功率中速柴油机连杆轴瓦故障对曲轴可靠性的影响】唐少辉.pdf

中文摘要 可靠性是内燃机最基本、最重要的技术经济指标。曲轴 作为内燃机中最重要的部件之一,其运行的可靠性更具有重 要意义。曲轴故障属于柴油机重大故障。近些年来,随着设 计水平的不断提高,静强度不足所引起的曲轴故障越来越少,而频繁的轴瓦故障已成为导致曲轴故障的重要原因.随着改革开放和经济发展,社会对电力的需求不断增加,大功率中速柴油发电厂成为补充电力不足的重要力量。而中 速柴油发电机在运行中有很多故障,尤其是轴瓦的故障频繁,由此所引起的曲轴故障也很多,表现为烧瓦导致轴颈表面出 现微裂纹和裂纹。ABSTRACT Reliabilityisthe most fundamental,important technique and economical indexforinternal combustion engines.As the center part of the internal combustion engine,reliability ofthe crankshaft is of greatimportance.The failure of crankshaft is the fatal failure.becomes cold.When thecrank shaftisseverely sintered,Part of thecrank areinquenching condition.Its temperature is high enough to exceed the critical point of material,which make pearlite change to austerite.The bad quenching condition cause great thermal stress when itbecomes cold.