Increase of durability and wear resistance of internal combustion engine parts by changing their design features

Abstract

Based on the patterns of wear, change and redistribution of loads during operation, design solutions have been developed to improve the durability and wear resistance of tribo-joints of the crank mechanism and the cylinder-piston group of the internal combustion engine. With a variety and dispersion of factors determining durability and wear resistance, the change in wear and wear intension during the operation has a pronounced regular character. Theoretical coupling does not have a run-in period - optimal, i.e. the obtained geometric parameters of the friction pair are created during the machining of friction surfaces of the parts. Due to the lack of a run-in period, the theoretical resource - produced with the expected parameters, the more effective the actual unattended interface. As a rule, friction surfaces of machine parts have a pronounced, natural, regular wear. Deviations from natural wear (unnatural wear) are caused by: severe working conditions without violating the rules of operation; violation of technical conditions -defective products in manufacture and in operation; imperfect design due to insufficient knowledge of the problem and mistakenly defined technical conditions for production and operation. The efficiency of restoring the efficiency of the cylinder-piston group by replacing the rings without replacement of the cylinders is investigated on a 4-stroke, 4-cylinder engine ZMZ-402. In two cylinders pistons and rings change, in the other two only rings. In the cylinders with old pistons, the running-in proceeds more intensively. At the end of cold running-in, compression in cylinders with old pistons is higher than in cylinders with new pistons. Efficiency is achieved due to a greater correspondence of the geometric parameters of tribo-conjugations with old pistons to its accumulated values. The analysis of field studies confirms the legitimacy of the hypothesis of the theoretical study.

Keywords

Internal combustion engine / tribocoupling / durability / wear resistance / natural wear / slip area / pressure

References

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RIGHTS & PERMISSIONS

Kochenov V.A., Grunin K.E.