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Typical Wear of Cylinder Liner-Piston Ring of Marine Engine

2021-11-18

Based on the analysis of the basic causes of wear, the "cylinder liner-piston ring" part of marine engine includes the following four typical wear forms:

(1) Fatigue wear refers to the phenomenon that the friction surface generates great deformation and stress in the contact area, and cracks are formed and destroyed. Fatigue wear belongs to the friction loss of mechanical parts within the normal range;

(2) Abrasive wear is a phenomenon that hard particles cause abrasion and surface material falling off on the surface of the relatively moving friction pair. Excessive abrasive wear will polish the cylinder wall of the engine, which directly leads to the difficulty of forming a stable oil film on the cylinder wall surface of lubricating oil, resulting in increased wear. Aluminum and silicon in fuel are the main causes of abrasive wear;

(3) Adhesion wear is due to the "adhesion" on the surface of the friction pair when the external pressure increases or the lubricating medium fails. Adhesion wear is a very serious type of wear, which will lead to the peeling off of the coating made of special materials on the surface of the cylinder liner and cause serious harm to the normal operation of the engine;

(4) Corrosion wear refers to the phenomenon of material loss caused by the chemical or electrochemical reaction between the surface material and the surrounding medium during the relative movement of the surfaces of the friction pair. In the case of severe corrosion wear, the surface material of the cylinder wall will peel off and adhere to wear.
Determining the above friction forms is of great significance for studying the friction characteristics of marine oil friction pairs under the conditions of low sulfur fuel and low load, seeking the scheme to reduce the wear and prolonging the service life of engine parts. The above friction forms mainly occur in the mixed lubrication and boundary lubrication areas. By improving the proportion of additives, the mechanical wear resistance and corrosion wear resistance of lubricating oil can be improved, and the service life of mechanical parts can be prolonged in actual operation.