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Phase-Oriented Gear SystemsPhase-oriented gear systems are differential planetary transmissions in which each planet gear has two sets of unequal numbers of teeth indexed at prescribed relative angles (phases). The figure illustrates an application of the phase-oriented gearing concept to a relatively simple speed-reducing differential planetary transmission that includes a sun gear, an idler gear, three identical planet gears, a ground internal ring gear, and an output internal ring gear. Typically, the ground internal ring gear and output internal ring gear have different numbers of teeth, giving rise to a progressive and periodic phase shift between the corresponding pairs of teeth engaged by each successive planet gear. To accommodate this phase shift, it is necessary to introduce a compensating phase shift between the ground-gear-engaging and output-gearengaging sections of each planet gear. This is done by individually orienting each planet gear
Document ID
Document Type
Other - NASA Tech Brief
Vranish, John M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
November 1, 2007
Publication Information
Publication: NASA Tech Briefs, November 2007
Subject Category
Man/System Technology and Life Support
Report/Patent Number
Distribution Limits
Public Use Permitted.

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IDRelationTitle20100011209Analytic PrimaryNASA Tech Briefs, November 2007