Epicyclic geartrains are known to provide high power density and have become the geartrain of choice for the main power flow in virtually all rotorcraft designs. This paper presents a unique compound planetary design targeting a helicopter main gearbox transmission application. The design significantly improves power density over conventional geartrains through its innovative planet gear load-sharing configuration along with the utilization of high-performance materials for gears and bearings. Design studies were conducted comparing the power density of this new design to a baseline gearbox design. The results of these studies demonstrate an estimated 38% power density improvement over the baseline configuration. Of the total improvement, 86% is attributed to the novel load-sharing configuration while 14% is attributed to utilization of advanced materials and processes.
A High Ratio Power Dense Planetary Drive for Rotorcraft Applications
Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received November 14, 2012; final manuscript received August 23, 2013; published online December 18, 2013. Assoc. Editor: Avinash Singh.
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Ai, X., Orkin, C., and Kruse, R. (December 18, 2013). "A High Ratio Power Dense Planetary Drive for Rotorcraft Applications." ASME. J. Mech. Des. February 2014; 136(2): 021010. https://doi.org/10.1115/1.4025967
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