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Belt Drives 1. Transmitting of Power in Machinery Gears Chains Belts Belts preferred method: Between widely separated shafts Speed of the driven shaft different from driving shaft Advantages Quiet Smooth No lubrication required. Belt Drives 1.

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belt drives 1
Belt Drives 1
  • Transmitting of Power in Machinery
    • Gears
    • Chains
    • Belts
  • Belts preferred method:
    • Between widely separated shafts
    • Speed of the driven shaft different from driving shaft
  • Advantages
    • Quiet
    • Smooth
    • No lubrication required
belt drives 11
Belt Drives 1
  • Belts depend on friction to transfer energy and motion
    • (Except synchronous belts)
  • Friction belts exhibit:
    • Slip
    • Stretch
    • Creep
  • 3 basic types of belts
    • Flat belts
    • V-belts
    • Synchronous belts
belt drives 12
Belt Drives 1
  • Flat belts
    • Light duty, high speed application
      • Examples – copying machines
    • Wide heavier belts to transport power over long distance
      • Examples – mining operations, people movers, luggage movers
  • V-Belts
    • Provide higher torque
    • Used with grooved pulleys – sheaves
    • Tapered shape bulges during operation, walls only
    • Bottom never contacts the sheave
      • Examples – cars
    • Standard sizes
      • Dimensions and designations – V-belt and sheave gauge
belt drives 13
Belt Drives 1
  • Synchronous belts
    • Referred as timing belts
    • Flexible toothed belts used to synchronize the rotation of the driving shaft with the driven shaft without slippage
    • Wrap around toothed wheels – sprockets
    • No slippage, creep or stretch
belt drives 14
Belt Drives 1
  • Sheave Characteristics
    • Outside diameter (O.D.) and pitch diameter (D)
    • Pitch diameter - diameter of the sheave measured from the center line of the belt wrapped around it.
    • O.D and belt type known – pitch diameter provided by the manufacturer
belt drives 15
Belt Drives 1
  • Sheave Alignment
    • Misalignment
      • Uneven wear
      • Noise
      • High temperature
  • 3 types of Misalignment
    • Angular misalignment
      • Horizontal Angular
      • Vertical Angular
    • Parallel
    • Combination square (vertical) and straight edge (horizontal and parallel) check alignment.
belt drives 16
Belt Drives 1
  • Belt Tensioning
    • Belt tension factor on obtaining maximum efficiency and service life
    • Tensioning done by moving pillow block and/or motor
      • Too little – belt slippage
      • Too much – excessive stress on belts, bearings and shafts
    • Tool – Belt Tension Tester
      • Two scales
        • Upper – deflective force
        • Lower – measured belt span
belt drives 17
Belt Drives 1
  • Pitch diameter, speed and torque
    • D(1) – the diameter of the driving sheave
    • D(2) – the diameter of the driven sheave
    • n(1) – the speed of the driving sheave
    • n(2) – the speed of the driven sheave
    • T(1) – the torque of the driving sheave
    • T(2) – the torque of the driven sheave
  • To calculate any parameter use:
      • D(2)/D(1) = n(1)/n(2) = T(2)/T(1)