planet wheel
planet gear
noun
any one of the wheels of an epicyclic gear train that orbits the central axis of the train
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use planet wheel in a sentence
This consists of a fixed sun-wheel A, engaging with a planet-wheel B of the same diameter.
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