types:
balance,
balance wheel
a wheel that regulates the rate of movement in a machine; especially a wheel oscillating against the hairspring of a timepiece to regulate its beat
cartwheel
a wheel that has wooden spokes and a metal rim
car wheel
a wheel that has a tire and rim and hubcap; used to propel the car
driving wheel
a wheel that drives a motor vehicle (transforms torque into a tractive force)
nosewheel
a wheel located under the nose of an airplane that is part of the plane's landing gear
pinwheel
a wheel that has numerous pins that are set at right angles to its rim
potter's wheel
a horizontal rotating wheel holding the clay being shaped by a potter
ratchet wheel
toothed wheel held in place by a pawl or detent and turned by a lever
roller
a small wheel without spokes (as on a roller skate)
rowel
a small spiked wheel at the end of a spur
caster,
castor
a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable
noria
a water wheel with buckets attached to the rim; used to raise water for transfer to an irrigation channel
pinion
a gear with a small number of teeth designed to mesh with a larger wheel or rack
rack and pinion
a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
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