planet gear

(redirected from sun-and-planet gear)
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Noun1.Planet gear - an outer gear that revolves about a central sun gear of an epicyclic trainplanet gear - an outer gear that revolves about a central sun gear of an epicyclic train
epicyclic gear train, epicyclic train - a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis
cogwheel, gear, gear wheel, geared wheel - a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion