表面粗糙度幅值对点接触混合润滑的影响

摘要

建立了粗糙表面点接触混合润滑的数学模型。针对外加载荷为800N和80N，润滑油卷吸速度由静止增加到5000mm／s的工况，引入油膜厚度比、接触区域比、接触载荷比和最大压力比等混合润滑参数，分析了3种不同表面粗糙度幅值对混合润滑性能的影响。分析结果表明：接触表面的粗糙度幅值对混合润滑区域内平均油膜厚度、最大压力等均有显著影响。%A mathematical model was built for the mixed lubrication with point contact of rough surface. A set of mixed lubrication parameters such as ratio of lubrication film thickness, ratio of contact area, ratio of contact load, and ratio of maximum pressure were introduced to analyze the effects of 3 surface roughness amplitudes on the mixed lubrication under conditions of external loads of 800 and 80 N, and the lubricant entrainment velocities of 0-5000 mm/s. The results showed that the roughness amplitude of the contact surfaces has a significant effect on the average lubrication film thickness and the maximum pressure in the mixed lubrication region.