the combination of a hydraulic coupling with an automatically controlled epi- cyclic gear-box. This was the first fully automatic transmission to be introduced commercially, as the Hydra-Matic gear, by the General Motors Corporation of the United States;
the combination of a hydraulic converter-coupling (i.e. a torque converter in which the reactor is mounted on a free wheel, so that the features of a torque converter and a hydraulic coupling are combined) also with an automatically controlled epicyclic gear-box.
KeywordsSpeed Ratio Automatic Transmission Torque Converter Consult Engineer Individual Inventor
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