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Gear Ratio Epicyclic Drives Analysis

The article "Gear Ratio Epicyclic Drives Analysis" appeared in the June 2014 issue of Gear Technology.

It has been documented that epicyclic gear stages provide high load capacity and compactness to gear drives. This paper will focus on analysis and design of epicyclic gear arrangements that provide extremely high gear ratios. Indeed, a special, two-stage planetary arrangement may utilize a gear ratio of over one hundred thousand to one. This paper presents an analysis of such uncommon gear drive arrangements and defines their major parameters, limitations, and gear ratio maximization approaches. It also demonstrates numerical examples, existing designs, and potential applications.

epicyclic drives, gear ratios, design, planetary gear drives, planetary gears

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