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The sun and planet gear converted the vertical motion of a beam, driven by a steam engine , into circular motion using a 'planet', a cogwheel fixed at the end of the connecting rod connected to the beam of the engine. Spur gear systems Worm drive Rack and pinion Epicyclic planetary gearing Sun and planet gear Harmonic drive Cycloidal drive Non-circular gear. Wikimedia Commons has media related to Sun and planet gear. Timeline of heat engine technology. Not to be confused with planetary gear. This article needs additional citations for verification.

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