30 Bearings& Lubrication Fope
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30 Bearings& Lubrication Fope

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30 Bearings& Lubrication Fope 30 Bearings& Lubrication Fope Presentation Transcript

  • BEARINGS & LUBRICATION
  • PRINCIPLES OF FRICTION
  • TYPES OF BEARINGS
  • BEARING ARRANGEMENT THRUST RADIAL
  • BEARING ARRANGEMENT THRUST RADIAL
  • BEARING ARRANGEMENT
  • 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
  • BEARING NOMENCLATURE
  • LOAD DIRECTION
  • BALL BEARINGS
  • ROLLER BEARINGS
  • NEEDLE ROLLER BEARINGS
  • BEARING LIFE
  • LOAD CARRYING SURFACES
  • BEARING DESIGNATION
  • BEARING DESIGNATION
  • BEARING FAILURE ANALYSIS
    • A 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.
  • FRICTION BEARINGS TILTING PAD BEARING SLEEVE BEARINGS
  • WORKING PRINCIPLE
  • TILTING PAD RADIAL BEARING
  • TILTING PAD THRUST BEARING
  • LUBRICATION
  • 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
  • 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
  • GREASE Vs OIL
    • When greases?
    • Normal speed and temp conditions
    • Simpler / cheaper installation
    • Better adhesion
    • Protection against impurities
    • Less frequent application required
    • When 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
  • LUBE OIL PROPERTIES
      • Viscosity
      • Viscosity index
      • Flash point
      • Pour point
      • Oxidation stability
      • Demulsibility
      • Load carrying ability (EP)
      • Detergency
      • TAN / TBN
  • 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
  • LUBE OIL SELECTION
    • OEM recommendation
    • Viscosity & VI
    • Bearing and lubrication type
    • Operating temperature
  • LUBE OIL MONITORING
    • Lube oil level
    • Oil pressure
    • Oil inlet and outlet temp
    • Lube cooler inlet & outlet temp
    • Oil filter DP
    • Bearing temp
  • 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
  • WDA Methodology
    • Particle Size
    • Composition
    • Shape
    • Concentration
  • WDA Trend Graph
  • 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
  • WDA : Advantages and disadvantages
    • Advantages:
    • Provides early warning
    • Identifies lubricant contamination
    • Identifies specific failing components
    • Helps monitor component deterioration
    • Disadvantages:
    • Trending is necessary
    • Accuracy depends on sampling point, skill