A Study of the Dependence of the Functional Properties of the Cylinder Liner Surface Layer on the Operating Conditions

Abstract

The paper presents results of the measurements of the surface roughness and physical properties of the outer layer of honed cylinders. The results of wear measurement of the cylinders and piston rings mating with them during running-in and during automotive engine operation under artificially increased dustiness conditions are presented and analysed. Interdependences among the state of the cylinder liner outer layer and operating parameters of the engines after running-in are also analysed. Additionally, the honed cylinder liners were used as specimens in wear resistance tests performed in the presence of lubricating oil with some amount of grinding particles. The results of the measurements of specimen and counter-specimen wear, as well as friction force and temperature at the friction surfaces during the test, are also presented and analysed. It was found that abrasive wear resistance of the honed cylinder liner depends on the operating conditions. During engine operation under increased dustiness conditions cylinder wear intensity depends mainly on the initial surface topography. Under conditions of low relative speed, low temperature and constant load, cylinder wear resistance in the case of large wear values depends on physical properties of the surface layer. However, when the amount of wear is smaller than the initial surface height, cylinder wear intensity in two studied cases depends mainly on its surface topography.

Keywords

surface roughness honed cylinder liner wear resistance tests operating conditions initial surface topography

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