本文给出了描述内燃机活塞环组贫油润滑状态及其摩擦特性的通用数学模型,并将其计算结果和富油润滑模型的结果进行了比较。在贫油润滑模型中,由于假定各环(除最底下的那道油环以外)的入口油膜为前一活塞环经过相同位置时留在缸套上的尾迹油膜,使计算的气环油膜厚度曲线出现波动。这种波动在实际内燃机中是客观存在的。此外,模型可方便地用以讨论活塞环面形状、活塞环数、油膜温度和发动机转速等参数对最小油膜厚度及摩擦功损失的影响。 In this paper, a general mathematic model describing the lean oil lubrication state and its friction characteristics of the piston ring of an internal combustion engine is given. The calculated results are compared with those of the oil rich lubrication model. In the lean oil lubrication model, since the inlet oil film of each ring (except the lowest oil ring) is assumed to be the wake oil film remaining on the liner when the previous piston ring passes through the same position, the calculated gas ring oil film thickness Curves fluctuate. This fluctuation in the actual internal combustion engine is an objective reality. In addition, the model can be easily used to discuss the impact of piston ring shape, piston ring number, oil film temperature and engine speed on minimum oil film thickness and friction loss.