计及曲轴强度的曲轴轴承优化设计  

Optimization Design of Crankshaft Bearing Combining Crankshaft Strength Factor

作　　者：孙军[1] 符永红[1] 邓玫[1] 蔡晓霞[1] 桂长林[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,安徽合肥230009

出　　处：《内燃机学报》2009年第1期92-95,共4页Transactions of Csice

基　　金：国家自然科学基金资助项目(50575065);清华大学摩擦学国家重点重点实验室开放基金资助项目(SKLTKF08B05)

摘　　要：以某4冲程4缸内燃机曲轴-轴承系统为研究对象,在计及曲轴强度下进行曲轴轴承优化设计,研究轴承优化设计中考虑曲轴强度的必要性。在建立轴承优化设计模型中,将曲轴强度作为约束条件之一,采用粒子群算法进行优化计算。结果表明,相比于原机轴承设计,在满足曲轴强度要求的情况下,通过曲轴轴承优化设计轴承总平均摩擦功耗降低了14.21%。同时进行了不考虑对曲轴影响的曲轴轴承优化设计计算,此时虽然轴承总平均摩擦功耗有明显降低,但曲轴强度已不能满足使用要求。因此,合理的曲轴轴承优化设计应从曲轴-轴承系统整体出发,计及对曲轴强度的影响,以获得满足系统要求的最优解。The crankshaft-bearing system of a four-stroke four-cylinder engine was taken as the research object, the optimization design of crankshaft bearing including the consideration of crankshaft strength was carried out. The necessity for the inclusion of crankshaft strength factor in the optimization design of crankshaft bearing was studied. The crankshaft strength was taken as one of restriction conditions when establishing the model of optimization design of crankshaft bearing. The particle swarm algorithm was used to optimize the crankshaft bearing. The results show that, comparing to the design of bearing for the original engine, 14.21% reduction in total average power loss of bearing friction is presented by the optimized design of crankshaft bearing while meeting the crankshaft strength. Meanwhile, the optimization design of crankshaft bearing without taking into account the effect on crankshaft was analyzed. In this case, although total average power loss of bearing friction reduces obviously, the crankshaft strength can not meet the design demand. Therefore, the reasonable optimization design of crankshaft bearing should consider whole crankshaft-bearing system and the effect on crankshaft strength, and optimization solution in system demand can be obtained.

关 键 词：内燃机 曲轴轴承 优化设计 曲轴强度 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]