Liner Micro-pit Lubrication Theory Model And Analysis

The lubrication of cylinder-piston rings system has a very significant impact on the normal operation of the engine,service life and so on. The cylinder of engine is an important part in the cylinder-piston rings system, so how to improve the performance of cylinder to be benefit to the lubrication of the cylinder-piston rings system receives more attention.The thesis have studied the independent,uniformly distributed in the tens of thousands of micro-pits in the inner surface of the cylinder. According to the classical Reynolds equation, the mathematical model of the lubrication theory of micro-pit liner - piston ring have established by using hydrodynamic lubrication theory. Introduced the multi-grid method of partial differential equations numerical solving process and the variation of multi-grid methods, used finite difference method and the SOR method to solve the lubrication theory model, based on Matlab programming language,solved the discrete model of the micro -pits liner - piston ring lubrication theory by numerical analysis. Analysis the area of micro pits,depth of micro pits and the radius of the micro pits micro-hydrodynamic lubrication performance of laws and obtain the optimal geometric parameters of micro-pits of the combination. In theory,the pits on the surface of the micro-cylinder morphology and distribution characteristics of the geometric parameters were optimized. In the experimental study, the verify cylinder matrix micro pits which have been processed and observed in the shape of paraboloid of revolution,was the best geometry. Measuring the depth of micro-pits and comparing with the optimal micro pits parameters,which provide the amendments of the basis for the processing.