ENDURANCE TEST OF AN-1 ROLLER GEAR DRIVE
TRW INC CLEVELAND OH TRW ACCESSORIES DIV
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This report presents a review of the 1,000-hour endurance test of the roller gear power transmission. The primary purpose of this program was to determine the feasibility of roller gear drive arrangements for power reductions in helicopter transmissions and to determine critical design parameters for the drive. An endurance run was made for 1,000 hours on two roller gear drives mounted in a back-to-back test rig with a 200-horsepower load applied continuously with the high-speed shaft at 28,000 RPM and the low-speed shaft at 600 RPM in each box. An instrumentation system was provided to measure loads, speeds, oil flows, and temperatures, and to measure vibration levels. The test has confirmed that the roller gear drive is feasible for helicopter power reductions and has the ability to accept high input speeds and to accomplish high ratio reductions in one plane with very high efficiency, 98.5 or better with a high degree of mechanical reliability.
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