某燃气发动机活塞强度校核及疲劳分析  

Strength Check and Fatigue Analysis of a Gas Engine Piston

作　　者：魏达 郑智锋 郭培苗 张康新 Wei Da;Zheng Zhifeng;Guo Peimiao

机构地区：[1]山西柴油机工业有限责任公司

出　　处：《工程机械》2025年第3期40-45,I0002,共7页Construction Machinery and Equipment

摘　　要：零部件的热负荷是发动机进一步强化受到限制的主要原因之一,直接影响到发动机的耐久性、可靠性和经济性。燃气发动机较柴油发动机的热负荷有明显提高,因此燃气发动机在设计时需考虑零部件热负荷承受能力。基于某型燃气发动机需求,设计一款专用钢顶铝裙式活塞,并对活塞进行热-结构耦合分析及疲劳分析。结果表明:活塞最大等效应力出现在钢顶和铝裙的连接螺栓处,最大应力为945 MPa,安全系数为1.716,满足工程使用要求。The thermal load of components is one of the main reasons limiting the further strengthening of engines,which directly affects the durability,reliability and economy of engines.The thermal load of gas engines is significantly higher than that of diesel engines,so the thermal load bearing capacity of components needs to be considered in the design of gas engines.Based on the requirements of a gas engine,a special steel top aluminum skirt piston is designed,and thermalstructural coupling analysis and fatigue analysis are performed on the piston.The results show that,the maximum equivalent stress of the piston appears at the connecting bolt between the steel top and the aluminum skirt,with a maximum stress of 945 MPa and a safety coefficient of 1.716,which meets the requirements for engineering application.

关 键 词：燃气发动机 活塞 热-结构耦合分析 疲劳分析 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程]