刘泽涛1,2，魏红玲1,2，徐庆增1,2，宋广迎1,2

1.内燃机可靠性国家重点实验室，山东 潍坊 261061; 2.潍柴动力股份有限公司, 山东 潍坊 261061

摘要：通过研究公差分析原理及流程，利用VSA软件建立发动机曲轴正时相位空气间隙虚拟装配模型，采用蒙特卡洛法进行累积公差仿真分析，研究初始设计阶段零件特征对空气间隙的影响和贡献率。结果表明：虚拟装配技术可以在产品设计阶段避免装配时的公差累积，为产品公差再设计提供解决方案，缩短产品开发周期，为产品设计提供准确可靠的依据。

关键词：虚拟装配；曲轴正时相位；空气间隙公差分析；发动机；VSA软件

Abstract:By studying the principle and process of tolerance analysis，VSA software is used to establish the virtual assembly model of engine crankshaft timing phase air gap, and Monte Carlo method is used to carry out the cumulative tolerance simulation analysis,the influence and contribution rate of part characteristics on air gap in the initial design phase are studied. The results show that the virtual assembly technology can avoid tolerance accumulation during assembly during product design stage, provide solutions for product tolerance redesign, shorten product development cycle, and provide accurate and reliable basis for product design.

Keywords:virtual assembly; crankshaft timing phase; air gap tolerance analysis; engine; VSA software