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Elastohydrodynamic principles applied to the design of helicopter componentsElastohydrodynamic principles affecting the lubrication of transmission components are presented and discussed. Surface temperature of the transmission bearings and gears affect elastohydrodynamic film thickness. Traction forces and sliding as well as the inlet temperature determine surface temperatures. High contact ratio gears cause increased sliding and may run at higher surface temperatures. Component life is a function of the ratio of elastohydrodynamic film thickness to composite surface roughness. Lubricant starvation reduces elastrohydrodynamic film thickness and increases surface temperatures. Methods are presented which allow for the application of elastohydrodynamic principles to transmission design in order to increase system life and reliability.
Document ID
19730012342
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Townsend, D. P. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
May 11, 1973
Subject Category
Aircraft
Report/Patent Number
NASA-TM-X-68215
Meeting Information
Meeting: Natl. Forum of the Am. Helicopter Soc.
Location: Washington, D. C.
Country: United States
Start Date: May 10, 1973
End Date: May 11, 1973
Accession Number
73N21069
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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