In current lubrication analysis of piston skirt, the flooded status is generally considered in the piston skirt–cylinder liner frictional pair in all strokes of an engine operating cycle. However, the quantity of lubricating oil at the entrance of piston skirt cannot always ensure the sufficient lubrication status of piston skirt–cylinder liner frictional pair when the piston moves from the bottom dead center to the top dead center in actual engine. In this article, based on the model of piston secondary motion, fluid lubrication, and lubricating oil flow, the lubrication performance of piston skirt–cylinder liner frictional pair is analyzed, in which the quantity of lubricating oil detained on the surface of cylinder liner after the piston skirt moves from the top dead center to the bottom dead center and is considered as the quantity of lubricating oil at entrance of piston skirt when the piston moves from the bottom dead center to the top dead center. The results show that compared with current analysis, in which the sufficient lubrication of piston skirt–cylinder liner frictional pair is assumed in all strokes of engine, there are remarkable changes for the lubrication performance of piston skirt–cylinder liner frictional pair and the piston secondary motion when the lubrication status of the frictional pair in the upstroke of piston is determined by considering actual lubricating oil transport in the lubrication analysis of piston skirt.

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考虑润滑油输送的发动机活塞裙-缸套摩擦副润滑性能研究

在目前的活塞裙润滑分析中，通常在发动机工作循环的所有冲程中考虑活塞裙-气缸套摩擦副的溢流状态。然而，在实际发动机中，活塞从下止点移动到上止点时，活塞裙进口处的润滑油量并不能始终保证活塞裙-缸套摩擦副的充分润滑状态。本文基于活塞二次运动、流体润滑和润滑油流动模型，分析了活塞裙-缸套摩擦副的润滑性能，其中活塞裙从上止点移动到下止点后滞留在缸套表面的润滑油量，视为活塞从底部移动时活塞裙入口处的润滑油量。死点到上死点。结果表明，与目前假设活塞裙-缸套摩擦副在发动机全冲程充分润滑的分析相比，活塞裙-缸套摩擦副的润滑性能和活塞副的润滑性能发生了显着变化。在活塞裙部润滑分析中，通过考虑实际润滑油输送来确定活塞上冲程摩擦副润滑状态时的运动。