CA488活塞的强度分析及结构改进.pdf

( ) Journal of Mechanical Strength 2007 ,29 3 :501～506 ●研究简报 ● CA488 活塞的强度分析及结构改进 STRENGTH ANALYSIS AND STRUCTURE IMPROVEMENT OF THE CA488 PISTON 1 ,2 1 3 张继春 　李兴虎 　　马凡华 ( 1. 北京航空航天大学 汽车工程系 ,北京 100083) (2. 哈尔滨工业大学 汽车工程学院 ,威海 264209) (3. 清华大学 汽车安全与节能国家重点实验室 ,北京 100084) 1 ,2 1 3 ZHAN G JiChun 　LIN XingHu 　MA FanHua ( 1. Department of Automobile Engineering ,Beijing University of Aeronautics and Astronautics , Beijing 100083 , China) (2 . Department of Automobile Engineering , Harbin Institute of Technology , Weihai 264209 , China) (3 . State Key Laboratory of Automotive Safety and Energy , Tsinghua University ,Beijing 100084 , China) 摘要 　在详细分析发动机活塞负荷的基础上 ,提出活塞的机械、热边界条件 ,经过有限元计算得到活塞的机械应力、 热应力及耦合应力。计算结果显示原设计活塞有较大的储备强度 ,有进一步优化的可能。采用短活塞方案对原活塞进 行结构改进 ,改进后的活塞减小了压缩高度 ,降低了质量 ,使活塞结构更趋合理 ;有限元分析表明 ,各种应力应变均在设 计允许范围之内 ,活塞结构的改进是成功的。 关键词 　活塞 　有限元 　优化 中图分类号 　U464. 133. 1 　TB115 Abstract 　Based on the analysis of the loads of engine piston , mechanical and thermal boundary conditions of the piston were giv en. After finite element calculation , the mechanical , thermal and coupling stress of piston was obtained. The results show that the origi nal piston has enough intension and possibility to be improved. The structure of short piston was employed to optimize this piston. After optimization , the compression height and mass of the piston are reduced. The structure of pis