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Tribological Analysis of ‘Piston–Cylinder Liner’ Pair in High-Powered Diesel Engine


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DOI: https://doi.org/10.15866/ireme.v14i2.18241

Abstract


The paper analyzes tribological processes in combustion system components (CSC) of modern high-powered diesel engines (MEP 2.5 MPa) and how the specified processes are affected by various factors, such as thermal and mechanical deformation of CSC components (piston, piston ring and cylinder liner), smoothness and coating of friction surfaces, characteristics of lube oil, etc. It is apparent that friction pairs of engine running at MEP 2.5 MPa are exposed to much higher loads compared to that running at MEP 1.5 MPa. Such a considerable increase in MEP entails as a high increase in magnitude of fluctuations of clearance dimensions over the engine operating cycle. An increase in pressure and temperature of the oil layer causes a dramatic change in lube oil characteristics, and especially viscosity. Therefore, as far as high-powered engines are concerned, it is essential to take into account basic engine characteristics, including effective performance indices, in the course of friction pair design. The authors carried out an experimental and analytical research of CSC operation in order to contribute to the solution of the above-stated problem. The analysis confirms the crucial necessity to allow for the basic engine characteristics, including effective performance indices, when designing friction pairs for high-powered diesel engines.
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Keywords


Diesel Engine; Mean Effective Pressure; Tribological Process; Motor Oil; Kinematic Viscosity; Friction Losses; Wear

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References


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