高功率密度柴油机主轴承混合润滑特性  

Performance of Main Bearing in Mixed Lubrication of High Power-Density Diesel Engine

作　　者：张俊岩[1] 王晓力[1] 

机构地区：[1]北京理工大学机械与车辆工程学院,北京100081

出　　处：《内燃机学报》2011年第1期90-95,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(10872031);北京市自然科学基金资助项目(3102025);高等学科创新引智计划资助项目(B08043)

摘　　要：基于平均流量模型及微凸峰接触理论,对高功率密度柴油机主轴承的混合润滑进行了研究.针对柴油机高功率密度工况的特点,利用BOOST软件获得4缸柴油机的气缸压力,并联立求解了主轴承的平均雷诺方程、微凸体接触力方程与轴心运动方程.考察了不同机油品、不同进油温度、不同间隙及不同转速对润滑性能的影响.结果表明:随着进油温度的升高,最小膜厚比减小;间隙过大或过小都不利于润滑,应结合粗糙度的大小确定最佳间隙;低转速时,下半瓦发生磨损,而高转速时,上下半瓦均有磨损.Based on the average flow model and the asperity contact theory,the study is presented for mixed lubrication of main bearing in a high power density（HPD）diesel engine.The BOOST software is used to obtain cylinder pressure.The average Reynolds equation,the asperity contact equation and the motion equation of the journal center for main bearing are solved.The effects of difference in oil grade,inflow oil temperature,radial clearance of bearing and rotational speed of engine on lubricating perform-ance are analyzed.Results show that as inflow oil temperature increases,the minimum film thickness ratio is decreased.Effects of roughness need considering when determining the optimal radial clearance.Too large or too small radial clearance is not good for bearing lubrication.Lower half bushing is worn at low speed,while both upper half and lower half bushing are worn at high speed.

关 键 词：高功率密度柴油机 主轴承 混合润滑 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]