Parametrization design model of vavle rockerarm commonly used in small and medium sized engines was established in this paper.

建立了中小功率内燃机常用摇臂参数化设计模型。

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In addition, the lead free gasoline is being used in the engine, so vavle seat insert (VSI) must be made by scpecial materials.

燃料改用无铅汽油以后，阀座部分必须用特种材料制造的镶圈来补强，这种镶圈就是通常所谓的阀座圈。

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This paper describes some reasons and forms of losing efficacy of vavle. And it also shows some research methods and results of the losing efficacy of vavle.

本文阐述了发动机排气门失效的原因、形式以及现阶段关于发动机排气门失效的研究方法及研究成果。

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This paper describes some reasons and forms of losing efficacy of vavle. And it also shows some research methods and results of the losing efficacy of vavle.

本文阐述了发动机排气门失效的原因、形式以及现阶段关于发动机排气门失效的研究方法及研究成果。

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