The sun and planet gear (also called the planet and sun gear) was a method of converting reciprocal motion to rotary motion and was utilised in a reciprocating steam engine.
Note the planet-gear is fixed to the pumping rod and thus does not rotate around its own axis.The axis of the planet gear is connected to the axle of the sun gear, and therefore the flywheel, by a linkage that freely rotates around the axis of the sun gear and keeps the planet-gear engaged with the sun-gear.
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