Research on the Status of Lubricating Oil Transport in Piston Skirt-Cylinder Liner of Engine

Abstract

The status of the lubricating oil transport in the piston skirt-cylinder liner has important influence on the lubrication of piston assembly frictional pair, the consumption of lubricating oil, the emission, and the performance degradation of lubrication oil. In this paper, based on the model of piston secondary motion, fluid lubrication and lubricating oil flow, the status of the lubricating oil transport between the piston skirt and the cylinder liner on different engine operating condition is calculated, and the quantity of lubricating oil retained on the surface of cylinder liner is mainly analyzed when the piston skirt moves from the top dead center to the bottom dead center. The results show that the variation of the quantity of retained lubricating oil is almost same in the corresponding stroke on different engine operating condition; the quantity of retained lubricating oil is dissimilar at different moment and is equal in principle at the piston top and bottom dead center. The quantity of lubricating oil retention is dissimilar at different moment in the intake stroke or expansion stroke, but the quantity of lubricating oil retention is equal in principle at the top and bottom dead center on different engine operating condition. When the engine is on the same load condition, as the engine rotational speed increasing, the quantity of retained lubricating oil is decreased in the whole intake stroke and the middle and later parts of expansion stroke, but the quantity of retained lubricating oil is increased in the front part of expansion stroke. When the engine is on the same rotational speed condition, the quantity of retained lubricating oil increases with the increasing engine load in the front part of expansion stroke, it does not vary with the engine load in principle in the middle and later part of expansion stroke, the variation that the quantity of retained lubricating oil varies with the engine load is dissimilar in the intake stroke on different engine rotational speed condition.

3D Roughness Prediction Modeling and Evaluation of Textured Liner of Piston Component-cylinder System

“…(2) The image reference plane is reconstructed (middle and low frequency information related to waviness, shape and position error), and high frequency information of the image related to the roughness is separated accurately and the characteristic parameters of high frequency information are extracted. (3) The relationship between the characteristic parameters of high frequency information and 3D roughness is modeled to implement machine vision perception of 3D roughness. Fig.…”

“…The piston assembly-cylinder liner system and the interaction interface of each subsystem often exhibit complex tribological behavior, and its service performance and efficiency directly depend on the service reliability of components such as piston assembly and cylinder liner [2]. The evolution of the service reliability of the piston assembly-cylinder liner system is closely related to the tribological behavior of the movement and the change of the machined surface topography [3,4]. Therefore, accurate measurement and characterization of the surface topography is of great significance to the service performance of the internal combustion engines [5][6][7][8][9].…”

Effects of different surface textures on tribological performances of the cylinder liner-piston ring: An experimental study

“…In order to obtain better lubrication and tribological performance, many scholars carried out researches on lubrication and friction of CLPR, and make full use of the modern lubrication and antifriction technology to improve the service performance of equipments. [3][4][5] The lubrication flow model of the piston ring was established based on the lubrication control equation, and the lubrication performance of the engine at different operating conditions was analyzed. 6 Considering the impact of thermal deformation of the cylinder liner and temperature-viscosity effect on the lubrication performance of CLPR tribological pair, a lubrication model under thermal effects was established to analyze how the thermal effects influence the lubrication, 7 and the influence of the lubrication state on the oil consumption and friction was studied based on the mixed lubrication model.…”