RESEARCH PAPERS: Gearing and Power Transmission Papers

Reliability Model for Planetary Gear Trains

[+] Author and Article Information
M. Savage

The University of Akron, Akron, Ohio

C. A. Paridon

Hewlett Packard Company, Sunnyvale, Calif.

J. J. Coy

Propulsion Laboratory, AVRADCOM Research and Technology Laboratories, Lewis Research Center, Cleveland, Ohio

J. Mech., Trans., and Automation 105(3), 291-297 (Sep 01, 1983) (7 pages) doi:10.1115/1.3267359 History: Received June 11, 1982; Online November 19, 2009


A reliability model is presented for planetary gear trains in which the ring gear is fixed, the sun gear is the input, and the planet arm is the output. The input and output shafts are coaxial and the input and output torques are assumed to be coaxial with these shafts. Thrust and side loading are neglected. This type of gear train is commonly used in main rotor transmissions for helicopters and in other applications which require high reductions in speed. The reliability model is based on the Weibull distribution of the individual reliabilities of the transmission components. The transmission’s basic dynamic capacity is defined as the input torque which may be applied for one million input rotations of the sun gear. Load and life are related by a power law. The load-life exponent and basic dynamic capacity are developed as functions of the component capacities.

Copyright © 1983 by ASME
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