高尉尉1，2，王奇峰1,2, 陈丽1，2，马呈新1，2，王小田1，2

1.滨州渤海活塞有限公司，山东滨州256602；2.山东省发动机活塞摩擦副重点实验室，山东滨州256602

摘要：针对某汽油机出现的漏气量超标问题，对活塞裙部形线、销孔偏心、一环槽粗糙度及下侧面角度等活塞结构参数进行优化设计，利用动力学分析软件进行对比分析计算，得到改进活塞设计减少漏气量的优化方案。分析结果表明，活塞优化后，发动机总漏气量降低12.46%，有效解决汽油机漏气量超标的问题。台架试验验证动力学分析结果的正确性，优化方案可以为解决发动机漏气量超标问题提供理论依据。

关键词：汽油机；漏气量；活塞结构参数；动力学计算

Abstract:In order to solve the problem of excess blowby for gasoline engine, the dynamic simulation is used to analyze the influence of piston structural parameters, such as skirt profile, pin bore offset, 1st groove roughness and lower side angle on engine blowby, and the optimization is carried out. The results show that the total blowby is reduced 12.46% which effectively solved the problem of excess blowby for gasoline engine. After bench test, the consistency of simulated analysis and the test results are verified. This optimization can provide theoretical basis for solving the engine overrun blowby.

  Keywords:gasoline engine; blowby ; piston structural parameters; dynamic simulation