某型柴油机重大故障原因分析

摘 要：通过对故障柴油机连杆、连杆螺栓、平衡块螺栓、排气阀、排气阀导管、活塞、缸套等失效件的理化分析，故障柴油机气门间隙的检查，连杆受力分析与气阀的动力学分析及疲劳计算，结果表明：故障柴油机的首断件为排气阀，排气阀断裂的原因是气阀间隙过大造成的，在气阀间隙较大的情况下，阀杆受力大大增加，其疲劳安全系数大大降低。以上理论计算和理化分析的结果为正确判断柴油机的故障提供了有力支持。

Analysis of the reason of a major failure on diesel

Abstract: Based on three stages of the analysis, the result indicates that the exhaust valve of the failure diesel break first , the broken valve is due to the excessive valve gap and the fatigue safety factor of the valve pole decreases greatly along with the loading increasing greatly under the condition of the excessive valve gap.The first stage analysis is the physical and chemistry analysis to the connect-rod, rod bolt, counterbalance bolt, exhaust valve, valve pipe, piston, and cylinder of the failure diesel. The second is inspecting the valve gap. The third is force analysis of the connect-rod and dynamical and fatigue analysis of the exhaust valve.The theoretical simulation and physical and chemistry analysis powerfully support to the failure reason of the diesel.