Lightweight Gearbox Composite Case. Phase 2
Final rept. 18 Mar 1970-18 Jan 1971,
GENERAL MOTORS CORP INDIANAPOLIS IN ALLISON GAS TURBINE DIV
Pagination or Media Count:
The machining, static testing and dynamometer testing of a boron- glass-epoxy composite material gearcase have been performed. A static deflection test was carried out to simulate the maximum case loading. A 12,000 lb load was applied to the main drive gear bearing support by means of a hydraulic ram. The composite case showed 16 less deflection at the front face and 11 less deflection at the support than a previous magnesium case. The composite case also showed less radial translation of the main bore than the magnesium case 26 less at the support and 14 less at the front face. A ten-hour dynamometer test was completed at 5,500 horsepower and 150,000 in. lbs. propeller shaft moment and it was concluded that the stiffness of the composite material front gear case was adequate in reacting the imposed loads to maintain proper gear and bearing alignment.
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