内燃机活塞环-缸套擦伤的理论分析与试验模拟

基于模拟试验和理论分析研究了活塞环－缸套的擦伤问题，测量了在不同的内燃机转速、润滑油及环境温度下发生擦伤的载荷及表面本体温度。根据试验结果通过混合润滑分析确定了发生擦伤时的微凸体承载量，并以此为基础采用Ｂｌｏｋ公式计算了微凸体瞬现温升，首次定量确定出了活塞环－缸套发生擦伤时的表面接触温度，建立了活塞环－缸套发生擦伤时的临界膜厚比准则

Experimental Simulation and Theoretical Analysis on Scuffing Failure of Piston Ring-Cylinder Liner

Scuffing failure phenomenon of piston ring cylinder liner is studied theoretically and experimentally.The load and bulk temperature when scuffing failure occurs are measured under different engine speed,different lubricant,and different environmental temperature on bench test.Based on the experimental results,the asperity capacity when scuffing occurs is evaluated.Surface contact temperature is determined with the measured temperature and the surface flash temperature calculated by Blok theory.Scuffing failure threshold of piston ring cylinder liner is established by using specific oil film thickness.