Design of an Advanced 500-hp Helicopter Transmission,
BELL HELICOPTER TEXTRON FORT WORTH TX
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The emphasis on the design of the NASABell Helicopter Textron BHT 500-hp advanced technology demonstrator transmission, which subsequently will be referred to as the 500-hp transmission, was placed on designing a 500-hp version of the OH-58C 317-hp transmission that would have the capabilities for a long, quiet life at a minimum increase in the cost, weight, and space that usually increases along with power increases. This was accomplished by implementing advanced technology that has been developed during the last decade and making improvements dictated by field experience. These advanced technology components, concepts, and improvements and their anticipated effect on the 500-hp transmission are High contact ratio spur gear teeth in the planetary, Spiral bevel gears made of cleaner gear steels, stronger gear steels Bearings made of cleaner steels in conjunction with improved analytical tools The investment cast planet carrier, hot isostatic pressed, as a replacement for the planet carrier The investment cast stainless-steel top case Improvements in the cantilever-mounted planetary ring gear, the sun gear, the straddle-mounted bevel gear.