This paper presents a wear process analysis of piston-cylinder set in internal combustion engines. Piston mechanism is a very important factor in the proper lubrication of the engine, but also a potential cause of increased consumption of oil. There are very important kinematic – tribological properties of piston mechanisms in this regard.

From the point of reliability and functionality, critical parts of this circuit are the piston rings. Wear is most pronounced in the first piston ring, since it is exposed to the highest pressure and temperature, as well as the direct impact of fuel and combustion products.

The intensity of wear of piston – cylinder set depends on many factors, but the most influential ones are: construction, materials used for the production of the parts of this assembly, production technology and conditions of use.

Aleksandar Skulić, Milan Bukvić