Simpson planetary gearset

Turbo Hydra-Matic mates a torque converter to a Simpson planetary gearset

The Simpson planetary gearset is a compound gear train consisting of two planetary gearsets with a common sun gear and a coupled ring gear and carrier. A Simpson gearset delivers three or four forward gears and one reverse, plus neutral, and is commonly employed in three- and four-speed automatic transmissions. It is one of the several designs invented by American engineer Howard Simpson.

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