王奇峰1，2,马呈新1，2,曹江鹏1，2,刘云芳1，2,夏金宝1，2
1.滨州渤海活塞有限公司，山东滨州256602；2.山东省发动机活塞摩擦副重点实验室，山东滨州256602
摘要：分析柴油和天然气2种燃料的性能和燃用2种燃料的发动机及活塞结构的异同，对2种燃料发动机的活塞燃烧室、内冷油道、火力岸及环槽等结构进行设计，并利用有限元分析软件ANSYS计算不同燃料活塞的温度和热机耦合应力分布以及疲劳系数。1000 h耐久试验表明：2种燃料发动机的活塞整体状况良好，均顺利通过试验；相比柴油机活塞，天然气机活塞内冷油道部位的温度降低34.1 ℃，最大热机耦合应力降低7.6 MPa。
关键词：商用车；活塞结构；有限元分析；耐久试验
Abstract:The performance of diesel and natural gas, the similarities and differences of the two kinds of engine and pistons used for diesel and natural gas engine are analysed.The structures of piston including the piston combustion chamber, the cold oil duct, the fire shore and the ring groove are designed. Finite element analysis is also used to calculate the temperature, thermalmechanical coupling stress distribution and the piston fatigue coefficient. After 1000 h endurance test, the results show that the pistons of the two engines are in good condition and pass the test successfully. Compared with the piston of diesel engine, the temperature of the cold oil passage in the piston of natural gas engine is reduced by 34.1 ℃, and the maximum thermally coupled stress is reduced by 7.6 MPa.
Keywords:commercial vehicle;piston structure; finite element calculation; endurance test
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