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Hybrid Gear Performance Under Loss-of-Lubrication ConditionsHybrid composite gear technology is being investigated to increase power density in rotorcraft drive systems. These gears differ from conventional steel gears in that the structural web material is replaced with a lightweight carbon fiber composite. Past studies have focused on performance of this technology under normal operating conditions, however, for this technology to be viable it must also withstand adverse conditions. The study presented here evaluates the performance of hybrid gears under loss-of-lubrication conditions in NASA Glenn Research Centers Contact Fatigue Test Facility. Two experiments are presented using small-scale 3.5 inch (8.9 cm) pitch diameter hybrid gears and compared to a baseline steel gear pair. Results of these tests show that there are limitations to the use of a hexagonal interlock pattern between the steel and composite. There is also evidence that the presence of polymer in the gear during an oil out event has a potential to increase time to failure. Further studies are planned to expand on these initial findings.
Document ID
20170007897
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Laberge, Kelsen E. (Army Research Lab. Cleveland, OH, United States)
Berkebile, Stephen P. (Army Research Lab. Cleveland, OH, United States)
Handschuh, Robert F. (NASA Glenn Research Center Cleveland, OH United States)
Roberts, Gary D. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
August 21, 2017
Publication Date
May 9, 2017
Subject Category
Aircraft Propulsion And Power
Composite Materials
Report/Patent Number
GRC-E-DAA-TN39822
Meeting Information
Meeting: American Helicopter Society Annual Forum
Location: Ft. Worth, TX
Country: United States
Start Date: May 9, 2017
End Date: May 11, 2017
Sponsors: American Helicopter Society, Inc.
Funding Number(s)
WBS: WBS 664817.02.03.02.02.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
Gearbox
Transmission
Gear

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