Accession Number : ADA266406


Title :   Sikorsky Aircraft Advanced Rotorcraft Transmission (ART) Program - Final Report


Descriptive Note : Contractor rept. (Final)


Corporate Author : UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV


Personal Author(s) : Kish, Jules G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266406.pdf


Report Date : Mar 1993


Pagination or Media Count : 209


Abstract : The objectives of the Advanced Rotorcraft Transmission program were to achieve a 25% weight reduction, a 10 dB noise reduction, and a 5,000 hour mean time between removals (MTBR). A three engine Army Cargo Aircraft (ACA) of 85,000 pound gross weight was used as the baseline. Preliminary designs were conducted of split path and split torque transmissions to evaluate weight, reliability, and noise. A split path gearbox was determined to be 23% lighter, greater than 10 dB quieter, and almost four times more reliable than the baseline two stage planetary design. Detail design studies were conducted of the chosen split path configuration and drawings were produced of a 1/2 size gearbox consisting of a single engine path of the split path section. Fabrication and testing was then conducted on the 1/2 size gearbox. The 1/2 size gearbox testing proved that the concept of the split path gearbox with high reduction ratio double helical output gear was sound. The improvements were attributed to extensive use of composites, spring clutches, advanced high hot hardness gear steels, the split path configuration itself, high reduction ratio, double helical gearing on the output stage, elastomeric load sharing devices, and elimination of accessory drives.... Transmissions, Gears, Bearings, Helicopters


Descriptors :   *GEARS , *HELICOPTER ENGINES , *TRANSMISSIONS(MECHANICAL) , OUTPUT , RATIOS , REMOVAL , AIRCRAFT , PATHS , FABRICATION , TIME , RELIABILITY , SHARING , CONFIGURATIONS , SOUND , CARGO , DRIVES , BEARINGS , NOISE REDUCTION , MEAN , ARMY , ELIMINATION , WEIGHT REDUCTION , HARDNESS , TORQUE , CLUTCHES


Subject Categories : Helicopters
      Jet and Gas Turbine Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE