建立活塞裙部缸套系统的混合润滑仿真模型,分析曲轴偏置对活塞动力学和裙部润滑性能的影响.活塞动力学模型中考虑了活塞环和连杆的影响,润滑模型以平均雷诺方程、粗糙表面微凸体接触模型和雷诺边界条件为基础,考虑了变形和润滑油剪切变薄效应对润滑性能的影响.分析曲轴偏置对活塞2阶运动和裙部润滑性能的影响,探索降低活塞摩擦损失的潜在技术方案.通过样件试制和试验,验证所提出技术方案的可行性.结果显示,曲轴正偏置是降低活塞裙部摩擦和整机油耗的一种有效措施.%A mixed lubrication model for the piston skirt-cylinder liner system is developed to analyze the effects of crankshaft offset on piston dynamics and the lubrication performance of piston skirt. In piston dynamics model the effects of piston ring and connecting rod are considered, while the lubrication model is based on average Reynolds equation, rough surface contact model and Reynolds boundary condition, with consideration of the effect of deformation and the shear-thinning effect of lubricating oil on lubrication performance. The effects of crankshaft offset on piston secondary motion and the lubrication performance of piston skirt are analyzed, the potential technical schemes for reducing the friction loss of piston are explored, and the feasibility of technical schemes proposed is ver-ified through prototype trial production and tests. The results show that positive crankshaft offset is an effective meas-ure to reduce the friction of piston skirt and the fuel consumption of engine.
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