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Rolling Element Bearings

2009-07-26
Bobby
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  • Rolling Element Bearings
  • The advantages and disadvantages of rolling bearings
  • Rolling element bearing use Elasto-hydrodynamic lubrication
  • Bearing failure
  • Case Study
  • All Pages
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The advantages and disadvantages of rolling bearings Advantage: Low starting torque compact and ready to install machine members
  • It is generally easier to lubricate rolling bearings than plain bearings
  • Combined radial and thrust loads can be carried readily in a rolling bearing
  • High overloads can be carried for short periods without undue or adverse effects
  • Rolling bearings become noisy when nearing the end of their natural life.
  • Running clearances is less than plain bearings, preloading can reduce deflection and increase accuracy.
  • Standardisation by international agreement makes replacement and servicing easier
  • Better electrical insulation is possible than with plain bearings
  • Can be multifunctional e.g. combined water pump and fan on the same shaft
  • Disadvantage:

    1. More expensive than plain bearings with more parts to go wrong
    2. They are noisier than plain bearings
    3. Their use at high speeds and loads are limited by centrifugal, fatigue and brinelling effects. Plain bearings can run faster and carry heavier loads.
    4. Brinelling, fretting can occur during static conditions when the bearing is subjected to vibration
    5. All rolling bearings have a finite life. If a large number of a particular bearing are produced for a particular application a percentage of premature failures can be anticipated
    6. Repair of rolling bearings is almost impossible in an average workshop. The entire unit has to be replaced when worn or failed
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      Keywords: Rolling element bearing, rolling, element bearing, bearing, bearing failure, normal life failure, premature failure, over greasing, misalignment, Lubrication failure, Rusting, True Brinelling, Overloading, indentation, cracking bearing, poor fit, loose fit, tight fit, cage wear, smearing
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