柴油机气门导管润滑与密封性研究

针对柴油机气门导管的漏油与磨损问题，设计了高性能粉末冶金材料和三种不同的密封结构，并从理论上对这些结构的流体动力润滑特性进行了分析计算；然后通过对材料改进前后的摩擦磨损试验、不同结构的漏油量对比试验和整机排放试验，证实材料设计和理论计算是合理的，同时也证实气门导管只加工凹槽而不安装密封圈的结构既可以润滑又可以密封．此结构不仅节省密封圈、简化装配工艺．而且减少进入进、排气道的机油量，降低颗粒排放，还减轻了气门副的磨损，从而在实际机型中得到应用。

Study on Lubricating and Sealing for Engine Valve Guide Bush

Aimed at the problems of abrasion and oil-leakage of the diesel engine valve guide bush,a new powder metallurgy material of high strength and abrasion resistance performance was developed Three different sealing structures were designed,and theoretical analysis of the characteristic of hydrodynamic lubrication for these structures was carried out.The experiments of friction and abrasion for the materials before and after development,the comparative experiment of oil-leakage for different structures and the experiment of the engine emission,proved the design of P/M material and the calculation of theory were suitable,the structure which only sealing groove is machined and seal-ring is not needed to be installed can reduce the amount of the lubricating oil that flows into the inlet and exhaust pipe,can lighten the abrasions of valve lever and valve guide bush,can decrease the engine emission.So this structure can be widely used in practical applications.