沙尘和低气压对发动机轴承性能的耦合影响  

Study of the Coupling Influent of Sand & Dust and Low Environment Pressure on the Bearings in Internal Combustion Engine

作　　者：冯凯[1] 张优云[1] 朱永生[1] 

机构地区：[1]西安交通大学润滑理论及轴承研究所,陕西西安710049

出　　处：《润滑与密封》2007年第4期72-75,共4页Lubrication Engineering

基　　金：国家自然科学基金项目(50375115)

摘　　要：建立了考虑沙尘和低气压对发动机轴承性能耦合影响的单缸发动机模型;研究了沙尘对润滑油粘度的影响,并且给出了其影响的公式;利用AVL公司提供的商用软件EXCITE Designer计算低气压和沙尘对发动机主轴承和连杆大端轴承工作性能的耦合影响。计算结果表明:随着混入润滑油中的沙尘浓度的增加,发动机主轴承和连杆大端轴承的偏心率都会明显向轴心缩小,轴承工作更稳定;摩擦功率损失明显增加。发动机环境气压越低,沙尘对发动机轴承偏心率和摩擦功率损失的影响程度越大。A calculated model of one-cylinder diesel engine was set up,and the coupling influence of sand ＆ dust and low environment pressure on the main bearing and big end one of engine was investigated. The influence of sand ＆ dust on the viscosity of lubricant was proposed by using the data measured in the experiment and an equation, which reflects the relationship ,was given. The coupling influence of sand-and-dust and low environment pressure on the main bearing and big end one of engine was calculated by the use of the commercial software EXCITE Designer from AVL Company. The calculation results show that,with the increase of the concentration of sand ＆ dust in lubri-cant, eccentricity ratio of the main bearing and the big end one of engine shrinks to the center obviously, the bearings work more stably, while their friction loss increases obviously. The lower the environment pressure of engine, the more the influence of sand and dust on the eccentricity ratio and friction loss of bearings

关 键 词：发动机 沙尘 低气压 偏心率 摩擦功率损失 

分 类 号：TK421.9[动力工程及工程热物理—动力机械及工程]