Elastohydrodynamic lubrication analysis of conjugate meshing face gear pairs

Zihni B. Saribay, Robert C. Bill, Edward Smith, Suren B. Rao

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

This paper investigates the nominal elastohydrodynamic lubrication (EHL) characteristics of the conjugate meshing face gears and predicts the mesh efficiency of the pericyclic transmission system. The meshing face-gear tooth geometries and meshing kinematics are modeled. Hertzian contact and the isothermal non-Newtonian lubricant film characteristics of the meshing face-gear pair are investigated. The friction coefficient is calculated with the effects of lubricant behavior and mesh kinematics. Finally, the pericyclic transmission efficiency is calculated as a function of friction coefficient, mesh loads, and mesh kinematics. The Hertzian contact behavior, film thickness, and friction coefficient values are simulated for an example fixed axis face-gear pair rotating at 1000 rpm with 3.4 kN-m torque. The EHL film thickness ranges from 0.1 to 0.25 μm in this example. The average friction coefficient is predicted as 0.05. The efficiencies of three different 24:1 reduction ratio 760 HP pericyclic transmission designs are investigated. The minimum and maximum efficiency in the given design space are 97% and 98.7%, respectively.

Original languageEnglish (US)
Article number032003
JournalJournal of the American Helicopter Society
Volume57
Issue number3
DOIs
StatePublished - 2012

Fingerprint

Elastohydrodynamic lubrication
Gears
Friction
Kinematics
Film thickness
Lubricants
Gear teeth
Torque
Geometry

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Materials Science(all)
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

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abstract = "This paper investigates the nominal elastohydrodynamic lubrication (EHL) characteristics of the conjugate meshing face gears and predicts the mesh efficiency of the pericyclic transmission system. The meshing face-gear tooth geometries and meshing kinematics are modeled. Hertzian contact and the isothermal non-Newtonian lubricant film characteristics of the meshing face-gear pair are investigated. The friction coefficient is calculated with the effects of lubricant behavior and mesh kinematics. Finally, the pericyclic transmission efficiency is calculated as a function of friction coefficient, mesh loads, and mesh kinematics. The Hertzian contact behavior, film thickness, and friction coefficient values are simulated for an example fixed axis face-gear pair rotating at 1000 rpm with 3.4 kN-m torque. The EHL film thickness ranges from 0.1 to 0.25 μm in this example. The average friction coefficient is predicted as 0.05. The efficiencies of three different 24:1 reduction ratio 760 HP pericyclic transmission designs are investigated. The minimum and maximum efficiency in the given design space are 97{\%} and 98.7{\%}, respectively.",
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Elastohydrodynamic lubrication analysis of conjugate meshing face gear pairs. / Saribay, Zihni B.; Bill, Robert C.; Smith, Edward; Rao, Suren B.

In: Journal of the American Helicopter Society, Vol. 57, No. 3, 032003, 2012.

Research output: Contribution to journalArticle

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