Volkov A. Effectiveness increase of thin-shell bearings for marine Diesel engines

A new task solution for operating efficiency increase of thin-shell bearings for marine Diesel engines by appreciable decrease of surface deterioration of bearing insert mating with connecting rod bed is represented in the thesis. There is a methodology developed with reference to the solution of the problem put by. The research technique of the energy dispersion process in the parts of the crank mechanism showed, that there is quantitative and qualitative connection between friction processes on the functional and outer surface of the insert. There was developed a mathematical model for prediction of fretting corrosion process and solution of the problem of its prevention. There was obtained a differential equation of insert moving relative to the connecting rod bed, which solution would allow to make amplitude-frequency characteristics relative to insert moving in the connecting rod seat. The obtained characteristics have a resonance pattern. There was determined a friction coefficient value on the functional surface of bearing, by excess of which fretting corrosion starts on its outer side. The experimental researches concerning determination of friction characteristics on the functional and outer surfaces of bearing were carried out. As a result, the area of plain bearing efficiency with minimum wear of functional and outer surface of thin-shell inserts was determined. Recommendations on development of the operation method of bearings with thin-shell inserts for marine internal-combustion engines with minimum operating costs were suggested.