Accession Number : ADA257175


Title :   Experimental Testing of Prototype Face Gears for Helicopter Transmissions


Descriptive Note : Technical memo.


Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC


Personal Author(s) : Handschuh, R ; Lewicki, D ; Bossler, R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257175.pdf


Report Date : Jan 1992


Pagination or Media Count : 15


Abstract : An experimental program to test the feasibility of using face gears in a high-speed and high-power environment was conducted. Four face gear sets were tested, two sets at a time, in a closed-loop test stand at pinion rotational speeds to 19,100 rpm and to 271 kW (364 hp). The test gear sets were one-half scale of the helicopter design gear set. Testing the gears at one- eighth power, the test gear set had slightly increased bending and compressive stresses when compared to the full scale design. The tests were performed in the NASA Lewis spiral bevel gear test facility. All four sets of gears successfully ran at 100 percent of design torque and speed for 30 million pinion cycles, and two sets successfully ran at 200 percent of torque for an additional 30 million pinion cycles. The results, although limited, demonstrated the feasibility of using face gears for high-speed, high-load applications.


Descriptors :   *TRANSMISSION GEARS , TEST AND EVALUATION , STRESSES , HIGH POWER , ENVIRONMENTS , FACILITIES , BENDING , CYCLES , TORQUE , TEST STANDS , TIME , HELICOPTERS , SCALE , POWER , LOOPS , TEST FACILITIES , GEARS


Subject Categories : Helicopters
      Machinery and Tools


Distribution Statement : APPROVED FOR PUBLIC RELEASE