Abstract
The paper presents an investigation in the area of planetary gear trains. Based upon previous investigations of the author, methodology for the determination of geometrical boundaries for planetary gear trains is systemized. Precise analytical relationships are analyzed. The objectives of the presented investigation are: to summarize and improve the existing methodology for the determination of the geometry boundaries of internal gear trains; to analyze the influence of the tribological parameters upon the functional capacity of such gear trains, to define and precise the influence of the geometry in internal meshing upon the energy efficiency in such transmission elements and to indicate the approach for finding optimal design solutions considering the energy efficiency of gear trains. The results of the investigation of internal gear trains with small difference between the teeth number of the pinion and the teeth number of the ring (from 1 to 10) give the options for a quick and precise determination of the optimal addendum modification coefficients for the pinion and the ring considering the criteria contact strength and energy efficiency of the gear meshing. Conclusion and recommendations concerning the energy efficiency of planetary gear trains are suggested by the author.
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