Analyzing the Surface Roughness Effects on Piston Skirt EHL in Initial Engine Start-Up Using Different Viscosity Grade Oils
Journal Title: Tribology in Industry - Year 2013, Vol 35, Issue 2
Abstract
The absence of fully developed fluid film lubrication between Piston and Liner surfaces is responsible for high friction and wear at initial engine start‐up. In this paper flow factor method is used in two dimensional Reynolds’ equation to model the effects of surface roughness characteristics on Piston Skirt elastohydrodynamic lubrication. The contact of surface asperities between the two surfaces and its after effects on EHL of piston skirtisinvestigated. For this purpose, two different grade oils are used to show the changing effects of viscosity combined with surface roughness on different parameters including film thickness, eccentricities and hydrodynamic pressures. The results of the presented model shows considerable effects on filmthickness of rough piston skirt, hydrodynamic pressures and eccentricities profilesfor 720 degrees crank angle.
Authors and Affiliations
M. Gulzar, S. A. Qasim, R. A. Mufti
Keywords
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