Bearing and Lubrication

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Bearing and Lubrication

  1. 1. BEARINGS &LUBRICATION
  2. 2. PRINCIPLES OF FRICTION
  3. 3. TYPES OF BEARINGS B E A R IN G P L A IN B E A R IN G R O L L IN G E L E M E N T OR A N T I F R IC T IO N B E A R IN G (A R E A C O N T A C T ) (P O IN T O R L IN E C O N T A C T ) J O U R N A L B E A R IN G G U ID E B E A R IN G T H R U S T B E A R IN G / T IL T IN G P A D (R A D IA L L O A D ) (B A C K & F O R T H ) (A X IA L L O A D ) M O T IO NS O L ID S P L IT HALF T IL T IN G P A D G . C Y L IN D E R & G . V E R T IC A L F A N R ID E R R IN G
  4. 4. BEARING ARRANGEMENT THRUST RADIAL
  5. 5. BEARING ARRANGEMENT THRUST RADIAL
  6. 6. BEARING ARRANGEMENT
  7. 7. ANTIFRICTION BEARINGS• BALL BEARINGS •RADIAL BALL BEARING •ANGULAR CONTACT BALL BEARING• ROLLER BEARINGS • CYLINDRICAL ROLLER BEARING • TAPER ROLLER BEARING • SPHERICAL ROLLER BEARING • NEEDLE ROLLER BEARING
  8. 8. BEARING NOMENCLATURE
  9. 9. LOAD DIRECTION
  10. 10. BALL BEARINGS
  11. 11. ROLLER BEARINGS
  12. 12. NEEDLE ROLLER BEARINGS
  13. 13. BEARING LIFE
  14. 14. LOAD CARRYING SURFACES
  15. 15. BEARING DESIGNATION
  16. 16. BEARING DESIGNATION
  17. 17. BEARING FAILURE ANALYSISA SURVEY REVEALS :• 9% FAILURE DUE TO FATIGUE.• 27% FAILURES DUE TO IMPROPER MOUNTING & DISMOUNTING.• 43% FAIL DUE TO IMPROPER LUBRICATION.• 21% FAILURES DUE TO OTHER CAUSES.OBJECTIVE:• 100% FAILURES DUE TO NORMAL FATIGUE.
  18. 18. FRICTION BEARINGS SLEEVE BEARINGSTILTING PAD BEARING
  19. 19. WORKING PRINCIPLE
  20. 20. TILTING PAD RADIAL BEARING
  21. 21. TILTING PAD THRUST BEARING
  22. 22. LUBRICATION
  23. 23. WHY LUBRICATION??• Formation of protective film to Reduce friction Prevent corrosion Remove wear particles and debris Provide efficient cooling Reduce wear Shock absorption Overall life improvement
  24. 24. LUBRICATION THEORY• Full film • Static • Hydrodynamic• Elastohydrodynamic • Application of pressure / load • Depends upon speeds, loads, lubricant viscosity• Boundary layer • Layer separation not complete • Results from insufficient lube, incorrect lube
  25. 25. GREASE Vs OILWhen greases? Normal speed and temp conditions Simpler / cheaper installation Better adhesion Protection against impurities Less frequent application requiredWhen Oils? High Speed and temp Excellent cleaning and flushing characteristics Can be used in recirculative systems Can serve better in excessive dirt environment More stable than greases
  26. 26. LUBE OIL PROPERTIESViscosityViscosity indexFlash pointPour pointOxidation stabilityDemulsibilityLoad carrying ability (EP)DetergencyTAN / TBN
  27. 27. TYPES OF LUBRICANTS• Automotive oils  Engine oils  Gear oils  Transmission oils  Other oils (preservative oils etc)• Industrial oils  Turbine oils  Hydraulic oils  Gear oils  Refrigeration compressor oils• Greases• Synthetic oils
  28. 28. LUBE OIL SELECTION OEM recommendation Viscosity & VI Bearing and lubrication type Operating temperature
  29. 29. LUBE OIL MONITORING Lube oil level Oil pressure Oil inlet and outlet temp Lube cooler inlet & outlet temp Oil filter DP Bearing temp
  30. 30. WDA Concept Every lubricated wear surface generates particles There is a gradual build up of small particles in a normal system When abnormal wear begins, there is no sharp instantaneous increase in the concentration of small particles present in the system Large particles, however, reach a dynamic equilibrium in a normal system (filtration) When abnormal wear begins, there is a dramatic increase in the concentration of large particles Therefore, detection, measurement and analysis of these large wear particles can provide early and accurate information about the condition of the machine
  31. 31. WDA Methodology• Particle Size• Composition• Shape• Concentration
  32. 32. WDA Trend Graph
  33. 33. Oil analysis Vs WDA• Lubricant Analysis – Monitoring of the lubricant – Condition of the lubricant – Viscosity, TAN, TBN, Water content, Insolubles• Wear debris Analysis – Monitoring of wear particles – Condition of the machine – Quantity of wear particles in ppm
  34. 34. WDA : Advantages and disadvantagesAdvantages: Provides early warning Identifies lubricant contamination Identifies specific failing components Helps monitor component deteriorationDisadvantages: Trending is necessary Accuracy depends on sampling point, skill

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