安装状态下柴油机主轴承孔及主轴瓦变形计算研究  

Computational Study of Main Bearing Bore and Bush Deformation in Assembly State

作　　者：王磊[1] 廖日东[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《内燃机工程》2013年第6期70-75,共6页Chinese Internal Combustion Engine Engineering

基　　金：教育部新世纪优秀人才支持计划项目(NCET-09-0042)

摘　　要：基于最小区域圆法的失圆度和偏心度计算,提出了一种改进的单纯形优化算法,对安装状态下某柴油机主轴承孔及主轴瓦的变形进行了研究。通过有限元模型迭代修改技术,模拟了机体-轴承盖装配状态下的镗孔工艺,对不同螺栓预紧力及不同轴瓦过盈量下轴瓦的变形进行了计算和分析。测量了主轴承孔和主轴瓦的变形,对部分计算结果进行了验证。结果表明:安装状态下,保持横拉螺栓预紧力不变,主轴承孔失圆度随竖拉螺栓预紧力的增加基本呈线性递增;机体-轴承盖间的摩擦系数对主轴承孔变形影响甚微;主轴瓦的变形随过盈量总体上呈线性变化,考虑镗孔工艺的主轴瓦失圆度小于不考虑该工艺时的2%。For the computation of loss of roundness and eccentricity based on the minimum zone circle method, an improved simplex optimization algorithm was proposed and used to study main bearing bore and bush assembling deformation. Simulated main bearing boring process in assembly by a finite element model updating method, the main bearing bush deformation under different pre-tightening forces and bush interferences was studied. The main bearing bore and bush assembling deformation was measured and partial computational results were validated. The results show that when maintaining the horizontal bolt pre- tightening force constant,the variation of the loss of roundness of main bearing bore is approximately linear with vertical pre-tightening force increase; the effect of friction coefficient between engine block and main bearing cap is negligible. The variation of main bearing assembling deformation with bush interference rise is linear generally;the loss of roundness of main bearing bush with considering the effect of boring process is about 2% of that without it.

关 键 词：内燃机 主轴承孔 轴瓦 变形 有限元法 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]