Archive > 2016 > March 2016 > Gear Design Effects on Performance of High-Speed Helical Geartrains as Used in Aerospace Drive Systems

Gear Design Effects on Performance of High-Speed Helical Geartrains as Used in Aerospace Drive Systems - March 2016

Robert Handschuh, Charles J. Kilmain, Ryan T. Ehinger, and Eric A. Sinusas

The article "Gear Design Effects on Performance of High-Speed Helical Geartrains as Used in Aerospace Drive Systems" appeared in the March 2016 issue of Power Transmission Engineering.

Summary
The performance of high-speed helical geartrains 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 Geartrain 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 (160–250° F) and lubricating jet pressure (60–80 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.

Keywords
aerospace gears, design, helical gears, aerospace gearboxes, gear drives

The article "Gear Design Effects on Performance of High-Speed Helical Geartrains as Used in Aerospace Drive Systems" should appear in the box below, but if you do not see it, you can download it here.

It appears you don't have a PDF plugin for this browser. No biggie... you can click here to download the PDF file.