Patent ID: 6231012
Filing Date: 2001-05-15
Classification: B64C,B64D,F16D,F16H,Y10T

Abstract:
An improvement in an aircraft no-back/offset gearbox having two gear stages (14) and (18) assembled in a unique, nested arrangement and interconnected with a shearout (40); said arrangement allowing the gears to share bearings but remain torsionally independent and capable of rotating with respect to one another in the event of shearout failure; one gear machined with an inner diameter capable of accepting a mating, outer diameter machined on the other gear as shown in FIGS. 7 and 8, such that a close tolerance slip fit results; said improvement having a built-in capability for removing said shearout without removal of the gearbox from the aircraft and without disassembly of the gearbox; said capability arising from an extractor (13) positioned within the bore of the shearout (40) as shown in FIG. 5; said extractor consisting of an aluminum shaft with a shoulder at one end having an outside diameter greater than the inside diameter of the shearout; said extractor being integrated into the design of the gearbox by being piloted at one end by a bore in the gearbox housing and at the other by a bore provided in the shearout cover plate (11), an improvement in an aircraft offset gearbox having a load proportional safety brake (no-back brake); said no-back brake being integrated into the gearbox such that it can be checked for proper operation without removal of the gearbox from the aircraft and without disassembly of the gearbox; said check being made possible by a female square drive (25) provided at one end of the gearbox output shaft, exposed with the removal of access coverplate (23).