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Gear Design Effects on the Performance of High Speed Helical Gear Trains as Used in Aerospace Drive Systems
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Author and Affiliation:
Handschuh, R.(NASA Glenn Research Center, Cleveland, OH, United States);
Kilmain, D.(Textron Bell Helicopter, Fort Worth, TX, United States);
Ehinger, R.(Textron Bell Helicopter, Fort Worth, TX, United States);
Sinusas, E.(Textron Bell Helicopter, Fort Worth, TX, United States)
Abstract: The performance of high-speed helical gear trains is of particular importance for tiltrotor aircraft drive systems. These drive systems are used to provide speed reduction/torque multiplication from the gas turbine output shaft and provide the necessary offset between these parallel shafts in the aircraft. Four different design configurations have been tested in the NASA Glenn Research Center, High Speed Helical Gear Train Test Facility. The design configurations included the current aircraft design, current design with isotropic superfinished gear surfaces, double helical design (inward and outward pumping), increased pitch (finer teeth), and an increased helix angle. All designs were tested at multiple input shaft speeds (up to 15,000 rpm) and applied power (up to 5,000 hp). Also two lubrication, system-related, variables were tested: oil inlet temperature (160 to 250 F) and lubricating jet pressure (60 to 80 psig). Experimental data recorded from these tests included power loss of the helical system under study, the temperature increase of the lubricant from inlet to outlet of the drive system and fling off temperatures (radially and axially). Also, all gear systems were tested with and without shrouds around the gears. The empirical data resulting from this study will be useful to the design of future helical gear train systems anticipated for next generation rotorcraft drive systems.
Publication Date: May 21, 2013
Document ID:
20130013527
(Acquired May 24, 2013)
Subject Category: AIRCRAFT PROPULSION AND POWER
Report/Patent Number: E-18652
Document Type: Conference Paper
Meeting Information: American Helicopter Society 69th Annual Forum; 21-23 May 2013; Phoenix, AZ; United States
Meeting Sponsor: American Helicopter Society, Inc.; Alexandria, VA, United States
Contract/Grant/Task Num: WBS 380046.02,03.02.02.01
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH, United States
Organization Source: NASA Glenn Research Center; Cleveland, OH, United States
Description: 10p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: TILT ROTOR AIRCRAFT; GEARS; GAS TURBINE ENGINES; GEAR TEETH; TRANSMISSIONS (MACHINE ELEMENTS); HELICES; HIGH SPEED; DRIVES; LUBRICANTS; INLET TEMPERATURE; TEST FACILITIES; SHAFTS (MACHINE ELEMENTS); SPIN TESTS; SHROUDS; PITCH (INCLINATION); LUBRICATION
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