基于SDT的发动机物理上止点公差分析方法研究  

Research on Engine Physical TDC Tolerance Analysis Method Based on Small Displacement Torsor

作　　者：刘泽涛 陈安明 赵文彬 付云贵 吴自鹏程 Liu Ze-tao;Chen An-ming;Zhao Wen-bin;Fu Yun-gui;Wu Zi-peng-cheng(Weichai Power Co.,Ltd.,Weifang 261061,China)

机构地区：[1]潍柴动力股份有限公司,山东潍坊261061

出　　处：《内燃机与配件》2023年第5期9-13,共5页Internal Combustion Engine & Parts

摘　　要：提高尺寸链中每个组成环特征的加工水平能够有效提高产品的性能一致性。以发动机活塞物理上止点的计算为例,研究了各类特征要素和几何公差要素参数化建模原理,利用小位移旋量构建了物理上止点公差模型,根据零部件装配关系构建了模型约束,结合蒙特卡洛法仿真,对物理上止点模型进行公差仿真计算,分析装配过程中不同特征对结果误差的影响。结果表明:活塞物理上止点数值分布属于正态分布,影响较大的特征为曲轴正时齿轮销孔结构,影响因子占比66.8%,需更改特征结构保证产品的性能一致性。Improving the processing level of each component ring in the dimension chain can effectively improve the product performance consistency.Taking the calculation of the physical TDC of an engine piston as an example,the parametric modeling principles of various characteristic elements and geometric tolerance elements are studied,the physical TDC tolerance model is constructed by using small displacement spinners,the model constraints were constructed according to the assembly relations of components.Combined with Monte Carlo simulation,the tolerance simulation of the physical TDC model was carried out to analyze the effect of different features on the result error in the assembly process.The results show that the distribution of physical TDC value of piston is normal,and the most influential feature is the pin hole structure of crankshaft timing gear,which accounts for 66.8%.The characteristic structure should be changed to ensure the consistency of product performance.

关 键 词：小位移旋量 物理上止点 公差建模 蒙特卡洛法 VSA仿真 

分 类 号：TK429[动力工程及工程热物理—动力机械及工程]