A Method to Analyze and Optimize the Load Sharing of Split Path Transmissions.

Abstract

Split-path transmissions are promising alternatives to the common planetary transmissions for rotorcraft. Heretofore, split-path designs proposed for or used in rotorcraft have featured load-sharing devices that add undesirable weight and complexity to the designs. A method was developed to analyze and optimize the load sharing in split-path transmissions without load-sharing devices. The method uses the clocking angle as a design parameter to optimize for equal load sharing. In addition, the clocking angle tolerance necessary to maintain acceptable load sharing can be calculated. The method evaluates the effects of gearshaft twisting and bending, tooth bending, Hertzian deformations within bearings, and movement of bearing supports on load sharing. It was used to study the NASA split-path test gearbox and the U.S. Army's Comanche helicopter main rotor gearbox. Acceptable load sharing was found to be achievable and maintainable by using proven manufacturing processes. The analytical results compare favorably to available experimental data.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1996
Accession Number
ADA318758

Entities

People

  • Timothy L. Krantz

Organizations

  • Glenn Research Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Bearings
  • Cartesian Coordinates
  • Computer Programs
  • Coordinate Systems
  • Experimental Data
  • Friction
  • Gears
  • Geometry
  • Manufacturing
  • Mechanical Engineering
  • Modulus Of Elasticity
  • Shape
  • Shear Modulus
  • Stiffness
  • Vehicles

Readers

  • Aerospace Engineering
  • Computational Modeling and Simulation
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).