M00021056
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SAE J646_201807 Planetary Gears - Terminology
standard by SAE International, 07/12/2018
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Availability date: 07/25/2021
Figures 1 through 5 illustrate in simplified form some of the more common planetary gear arrangements in order to establish applicable terminology. Figures 6 and 7 provide additional examples that use elements of those gear arrangements. Gear ratio is the numerical ratio of input to output speed.