#gear_wheel__gear__cogwheel  a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
  supertype:  #wheel  a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
  part:  #cog  #tooth_projection_on_a_gear
  subtype:  #bevel_gear__bevelgear__pinionandcrownwheel__pinion_and_ring_gear  gears that mesh at an angle
     subtype:  #differential_gear__differential  a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
  subtype:  #escape_wheel  gear that engages a rocking lever
  subtype:  #pinion  a gear with a small number of teeth designed to mesh with a larger wheel or rack
     subtype:  #lantern_pinion__lanternpinion__lantern_wheel__lanternwheel  a small pinion having cylindrical bars instead of teeth, used chiefly in inexpensive clocks
  subtype:  #planetary_gear__planetarygear__epicyclic_gear__epicyclicgear__planet_wheel__planet_gear  an outer gear that revolves about a central sun gear of an epicyclic train
  subtype:  #rack_and_pinion  a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
  subtype:  #spur_gear__spur_wheel  gear wheels that mesh in the same plane
  subtype:  #sun_gear__sungear  the central gear in a epicyclic train
  subtype:  #worm_gear  gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion
  subtype:  #worm_wheel  gear with the thread of a worm

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