Abstract
The main node piston-pin-piston rings are most responsible for the formation of mechanical losses. It is advisable to reduce friction losses in the piston-cylinder group lead to an increase in the overall efficiency of the engine and thus reduce the fuel consumption. The method to reduce the area covered by the oil film is a modification of the bearing surface of the piston by adjusting the profile. In this paper the results of simulation for the stepped microgeometry piston bearing surface are presented.
Highlights
The advancement of modern engines is aimed at environment protection and low fuel consumption [1,2]
Friction losses can be reduced by configuring a gap between the piston and the cylinder to provide a continuous oil film separating the cooperating surfaces
The results of the simulation showed that the stepped profile reduce friction loss by about 10% in relation to the barrel-like shape
Summary
The advancement of modern engines is aimed at environment protection and low fuel consumption [1,2]. To meet the above-mentioned criteria, engines are designed based on the idea of downsizing characterized by a reduction of their displacement and increasing their effective pressure by the application of a variety of supercharging systems [3]. The consequence of these changes is that engines operate at high thermal and mechanical loads. The stepped shape can be obtained i.e. by the application of refining coatings of materials with good friction properties [17,18,19] One such material is a graphite, commonly used to cover the bearing surface of the piston. The solution proposed by the authors hereby extends the scope of tasks performed by the coatings on the bearing surface of the piston
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