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The Simpson planetary gearset is a compound planetary gear train consisting of two planetary gearsets sharing a common sun gear. A Simpson gearset delivers three forward gears and one reverse, plus neutral, and is commonly employed in three and four ratio automatic transmissions.[1] It is one of the several designs invented by American engineer Howard Simpson.
- ^ Esmail EL (2008-01-01). "Nomographs for enumeration of clutching sequences associated with epicyclic-type automatic transmission mechanisms" (PDF). InASME International Mechanical Engineering Congress and Exposition. 48784: 165–174.