ME100 Basics of Mechanical Engineering Module 4 :'Gears and Gear Drives'





  •    A gear is a toothed member.
  •    It is designed to transmit motion and thus power to another toothed member by successively engaging its teeth with those of the other gear
  •    The teeth may be cut on cylindrical or conical or rectangular or elliptical blocks.
  •    The tooth shape and sizes of gears are standardized.
  •    The gears may be manufactured from metallic or nonmetallic materials.
  •   The metallic gears with cut teeth are commercially obtainable in cast iron, steel and bronze.

The main types of gears are as follows

  •    Spur Gear
  •    Helical gear
  •    Herringbone gears
  •    Bevel Gears
  •    Worm Gears
  •    Rack and pinion Gears

  • These are drives which transmit motion and thus power from one shaft to another with the help of gears when the distance between them is relatively small.
  • The axes of the shafts may be parallel, non-parallel or intersecting.
  • These are positive drives.
  •  They transmit power at a constant speed ratio


  •    It is a positive smooth drive
  • Operation is smooth and service is reliable.
  •    Transmit comparatively more power
  •    Transmit power in  any desired direction
  •    Gear wheels are interchangeable except Bevel gears



  •     Not suitable for large center distance because the drive    becomes bulky
  •    Production cost is high and efficiency is less
  •    Needs lubrication, hence maintenance cost is there.

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