Reliability Model for Planetary Gear Trains.

Abstract

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 co-axial and the input and output torques are assumed to be co-axial 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. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1982
Accession Number
ADA119165

Entities

People

  • Charles A. Paridon
  • John J. Coy
  • Michael Savage

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Angular Motion
  • Army Aviation
  • Bearings
  • Curvature
  • Engineering
  • Fatigue Life
  • Gear Teeth
  • Gears
  • Geometry
  • Helicopters
  • Mechanical Components
  • Mechanical Engineering
  • Planetary Gears
  • Probability
  • Probability Distributions
  • Rotation
  • Standards

Fields of Study

  • Engineering

Readers

  • Computer Programming and Software Development.
  • Statistical inference.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).