High-Survivable Transmission System
Final rept. Jan 1974-Aug 1975
BELL HELICOPTER TEXTRON INC FORT WORTH TX
Pagination or Media Count:
The purpose of this program was to design, fabricate, and test an integrated survivable transmission system for the AH-1GQ helicopter that would be capable of operation for 60 minutes following the loss of the normal lubrication system. Utilizing the results of previous contractual research efforts, an engineering analysis was performed which produced a design that included an emergency lubrication system in conjunction with some improved components. One transmission which incorporated the design modifications was fabricated and tested. The test program included an emergency lubrication test run in which a ballistic hit resulting in total loss of the main lubrication system was simulated, and the transmission was run on emergency lubrication at 950 input horsepower 85 of takeoff horsepower with 25 horsepower through the tail rotor until failure occurred. The transmission ran 4.0 hours following the loss of the normal lubrication system. After 4.0 hours of emergency running, the teeth of the lower sun gear were stripped off, resulting in complete loss of the mast torque and termination of the test. The design concept for the high- survivable transmission HST system tested during this program appears to be more than adequate to provide 60 minutes of transmission operation following the loss of the normal lubrication system. Test results indicate that the transmission could have operated indefinitely if the emergency oil had not leaked past the input seal.
- Lubricants and Hydraulic Fluids