Abstract
Epicyclic gears that were developed as speed reducers for man-powered hoists, winches, and capstans are shown to include the concept of speed-summing, parallel drive paths, multiple ratios, and coaxial split-torque trains, as now found in modern transmissions. Certain gears generate a high reduction ratio and are inefficient on account of an internal recirculation of power. This drawback, however, brings the advantage of a backdrive lock. Some modern gear trains are shown to be kinematically identical to those developed for the early hoists and winches. Analysis of these gear trains teaches how their limitations can be minimized while retaining the unique properties that, in recent years, have made them pre-eminent in vehicle power transmissions, turbine reduction gears, and aircraft hoists and actuators.
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