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.
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September 1983
This article was originally published in
Journal of Mechanisms, Transmissions, and Automation in Design
Research Papers
Reliability Model for Planetary Gear Trains
C. A. Paridon,
C. A. Paridon
Hewlett Packard Company, Sunnyvale, Calif.
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J. J. Coy
J. J. Coy
Propulsion Laboratory, AVRADCOM Research and Technology Laboratories, Lewis Research Center, Cleveland, Ohio
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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. Sep 1983, 105(3): 291-297 (7 pages)
Published Online: September 1, 1983
Article history
Received:
June 11, 1982
Online:
November 19, 2009
Citation
Savage, M., Paridon, C. A., and Coy, J. J. (September 1, 1983). "Reliability Model for Planetary Gear Trains." ASME. J. Mech., Trans., and Automation. September 1983; 105(3): 291–297. https://doi.org/10.1115/1.3267359
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