gear wheel

1. A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion (synset 103435461)
   is a type of: 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)
   subtypes:

   • bevel gear, pinion and crown wheel, pinion and ring gear - gears that mesh at an angle
   • escape wheel - gear that engages a rocking lever
   • pinion - a gear with a small number of teeth designed to mesh with a larger wheel or rack
   • epicyclic gear, planet gear, planet wheel, planetary gear - an outer gear that revolves about a central sun gear of an epicyclic train
   • rack and pinion - a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
   • spur gear, spur wheel - gear wheels that mesh in the same plane
   • sun gear - the central gear in an epicyclic train
   • 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
   • worm wheel - gear with the thread of a worm
   has:

   • cog, sprocket - tooth on the rim of gear wheel
   • tooth - one of a number of uniform projections on a gear
   same as: cogwheel, gear, geared wheel

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