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Lbrication System Seminar Report Maintenance Engineering
- 1. SUBMITTED BY JAYESH GUPTA 2020PGMFMS10 MAINTENANCE ENGINEERING LUBRICATION SEMINAR 1
- 2. CONTENTS • FRICTION • LUBRICATION • WHY LUBRICATION IS NEEDED • CLASSIFICATION OF LUBRICANTS • TYPE OF LUBRICATION
- 3. FRICTION Is the force resisting the relative motion of solid surfaces ,fluid layers and material elements sliding against each other .
- 4. LUBRICATION Lubrication is the process or technique employed to reduce wear of one or both surfaces in close proximity, and moving relative to each other, by interposing a substance called lubricant between the surfaces to help carry the load between them .
- 5. WHY LUBRICATION IS NEEDED ? • Friction / Wear • Heat generation • Increases life of machinery • Reduces energy consumption • Material protection • Sealing
- 6. CLASSIFICATION OF LUBRICANTS On the basis of its physical state, we can classify the lubricants as follows :-
- 7. TYPE OF LUBRICATION Considering the nature of motion between moving or sliding surfaces, there are different types or mechanisms by which the lubrication is done , They are: 1. Hydrodynamic orThick Film Lubrication 2. Hydrostatic lubrication 3. Elastohydrodynamic lubrication 4. Boundary or thin film lubrication 5. Mixed lubrication 6. Extreme pressure lubrication
- 8. 1. Hydrodynamic or (Thick Film Lubrication) • is exist when the moving surfaces are separated by the pressure of a continuous unbroken film or layer of lubrication. • In this type , the load is taken completely by the oil film. • It depends on the relative speed between the surfaces, oil viscosity, load, and clearance between the moving or sliding surfaces.
- 9. APPLICATION Delicate instruments. Light machines like watches, clocks, guns, sewing machines. Large plain bearings like pedestal bearings, main bearing of diesel engine . Scientific instruments .
- 10. 2 . Hydrostatic lubrication • It is essentially a form of hydrodynamic lubrication . • But the film instead of being self-generated, the separating pressure is supplied by an external oil pump . • Hydrostatic lubrication depends on the inlet pressure of oil and clearance between the surfaces .
- 12. APPLICATION This type of lubrication is mainly used in the following areas : • Two stroke engines . • Bigger machines
- 13. 3. Elastohydrodynamic lubrication • Is developed in heavily loaded rolling contacts . • The contacting surface is elastically deformed,distributing the load over a greater area . • High pressure results in increasing viscosity of lubricant , which improves load capacity .
- 14. Examples of machinery applications that operate under EHL are: • rolling element bearings, gear teeth and cam contacts (rolling) where high rolling contact loads occur.
- 15. 4. Boundary or thin film lubrication • Lubrication film is insufficient to separate the contacting surfaces. • the oil film thickness is so small . • metal to metal contact occurs between the moving surfaces .
- 16. This type of lubrication is used in the following areas 1.A shaft starts moving from rest. 2.The speed is very low. 3.The load is very high. 4.Viscosity of the lubricant is too low.
- 17. 5. Mixed lubrication . IT is the transition betweenHydrodynamic and Boundary lubrication. . Two surfaces are partly separated, partly in contact .
- 18. THANK YOU!!