| The piston ring/cylinder liner contact is one of the most important friction pairs in an internal combustion engine (ICE). The study of thermo-hydrodynamic lubrication simulation about this pair is important theoretically and practically. In order to improve the lubrication performance and efficiency as well as reliability of the pair, the technology of surface texturing as an effective way to improve fluid and non-fluid lubrication performance has been attracting attention.The tribology performance of laser textured surface without lubricant was studied experimentally. In this paper, the influence of texture morphology parameters (including surface density, depth and diameter), test conditions (including load and speed) and material on dry friction performance was investigated, which provide some supports to the textured piston ring/cylinder liner analysis.The theoretical thermo-hydrodynamic lubrication model of piston ring/cylinder liner contact was given. The multigrid method and the sequential scan method were used to get pressure and temperature respectively.The transient thermo-hydrodynamic lubrication simulation and isothermal hydrodynamic lubrication simulation were performed. It was observed that the pressure, the thickness of the lubricant film and the friction force obtained using the two models under different texture morphology parameters, different working conditions of friction pair and different characteristics of lubricating oil were significant difference. These results showed that the temperature should not be neglected.It was observed that the technology of surface texturing could significantly impove the performance of dry friction. It also found that the parameters of surface texture, speed and lubricant viscosity had significant influence on the lubrication of piston ring/cylinder liner pair of ICE. |
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