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ENGINE LUBRICATION SYSTEM & NETWORK ANALYSIS

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## ENGINE LUBRICATION SYSTEM & NETWORK ANALYSIS

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**ENGINE LUBRICATION SYSTEM & NETWORK ANALYSIS**PRATK JOSHI**CONTENTS**• Introduction • Properties of lubricant • Components used in lubrication system • Engine lubrication system • Flow network analysis • Oil pump flow analysis • Oil filter flow analysis • Hydraulic tappet analysis • Summary • References**INTRODUCTION**• To supply the lubricating oil between the moving parts is termed as lubrication system • Lubrication of all the parts in engine is essential to avoid: • Friction • wear • To prevent the seizure**PROPERTIES OF LUBRICANTS**• Viscosity • Density • Specific heat • Flash point • Adhesiveness • Chemical stability**COMPONENTS IN LUBRICATION SYSTEM**• Oil sump or Oil tank • Oil pump • Oil filter and strainer • Oil pressure gauge • Oil level indicator**FLOW NETWORK THEORY**• Flow rate & pressure drop through flow is calculated using two theories • Theory of mass conservation • The continuity of energy per unit mass**PIPE FLOW ANALYSIS**• For incompressible flow, pressure drop through pipe is given by Fanning equation • Where K is dimensionless experimental coefficient accounting head loss in bends, elbows, T-joints etc.**OIL PUMP FLOW ANALYSIS**• Gear pump with crescent guide between internal & external gear can be used as oil pump • Flow rate increases with increase in angular velocity**OIL FILTER ANALYSIS**• Oil filter is used to filter out the dirt and grit particle from oil • Lubricating oil is passed through the filter before passing to bearings FIG: Oil filter**The pressure difference and flow rate can be calculated by**formulae: • where , are constants and can be obtain by curve fitting (from matlab)**HYDRAULIC TAPPET FLOW ANALYSIS**Fig: Hydraulic tappet**SUMMARY**• Lubrication system • Properties of lubricant • Components in lubrication system • Engine flow lubrication system • Network flow analysis • Pipe flow analysis • Oil pump flow analysis • Oil filter flow analysis**REFRENCES**• S.M.Chun(2002), “Network analysis of an engine lubricating system”, Tribology international, 12 December. • Tran p, Yamamoto T, Baba Y, Hoshi M, “ An Analysis of lubricating system of automobile gasoline engine”, SAE 871659, 1987. • B.C. Majumdar, “Introduction to Tribology of bearing”, S.Chand publication, second edition 2008.