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以某型号直列式6缸机为载体,用数值方法求解活塞环-缸套三维润滑模型,分析了表面粗糙度、活塞环桶面高度和缸套椭圆度等结构参数对润滑状态的影响,给出了不同参数下最小油膜厚度的对比,以及几个曲轴转角下油膜压力和油膜厚度的分布情况。结果表明,结构参数对润滑有显著的影响;在做功冲程上止点附近油膜厚度最小,其值为0.559μm,油膜压力最大;在整个运行过程中,凸峰接触主要出现在做功冲程上止点附近。
Taking a certain type of inline 6-cylinder machine as a carrier, the three-dimensional lubrication model of piston ring-cylinder liner is solved numerically. The effects of structural parameters such as surface roughness, barrel height and liner ovality on lubrication status are analyzed. The comparison of the minimum oil film thickness under different parameters and the distribution of oil film pressure and oil film thickness under several crankshaft angles are given. The results show that the structural parameters have a significant influence on the lubrication. The thickness of the oil film near the top dead center is 0.559μm and the pressure of the oil film is the largest. During the whole operation, the contact of the peaks mainly occurs at the top dead center nearby.