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Efficiency of Small Machine Elements

Friction and efficiency in bearings and roller chains

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Typical efficiencies of well lubricated small machine elements:

  • ordinary bearings : 95 - 98%
  • roller bearings : 98%
  • ball bearings : 99%
  • spur gears with cut teeth including bearings : 99%
  • bevel gears with cut teeth including bearings : 98%
  • belts : 96 - 98%
  • high-class silent power transmission chain : 97 - 99%
  • roller chains : 95 - 97%
  • bicycle derailer : 87 - 97%
  • bicycle gear hub : 86 - 95%

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