梁杰辉，王彬，张士越

淄博淄柴新能源有限公司，山东 淄博，255000

摘要：针对某大型炼化尾气发电站内多台燃气发动机阀顶架导杆出现的断裂故障，分析导杆材料、强度、热处理工艺、装配工艺等，发现导致导杆断裂的主要原因为疲劳强度不足和装配工艺不规范。对导杆进行氮化处理，提高疲劳强度，进一步规范装配工艺，有效解决了导杆断裂问题。实际应用结果表明：表面氮化处理和规范装配工艺对轴类零件的可靠性至关重要。

关键词：燃气发动机；阀顶架导杆；断裂故障；表面氮化处理；规范装配工艺；轴类零件

Abstract:In a large refinery tail gas power station, fracture on guide rod of valve’s top frame was reported for several gas engines. This article analyzed the fracture on the guide rod of valve’s top frame, including the guide bar materials, strength, heat treatment process, assembly process in detail, and found that the main cause of the fracture of fatigue strength is insufficient and the assembly process is nonstandard. The guide bar was strengthened by nitriding treatment and the assembly was improved, which effectively solve the problem of guide rod fracture. It is shown that the surface nitriding treatment and improved assembly process are very important for the reliability of shaft parts.

Keywords:gas engine；guide rod of valve’s top frame；fracture；surface nitriding treatment；standard assembly process；shaft parts