Abstract
The ring seal under consideration has come out as a result of the complex research such as the numerical simulation research, introductory quality research involving a real object, comparative research on a tribotester and fundamental research on the real object. It has been found that the essence of excellent tribological properties of the new ring seal lies, in its low value of surface free energy (SFE) of titanium nitride coating on the piston ring and in its high value of energy which is the characteristic of the nitrided surface of the cast iron cylinder sleeve. As a result, when the motion of the ring on the sleeve surface ceases, especially in the outer dead centre (ODC) in expansion stroke, the boundary layer of oil on the sleeve surface prevents metallic contact. In general, it has been found that the SFE can be an important index of material selection for cutting pairs, especially for those working in the reciprocating motion.
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