Aeronautics and astronautics – Landing gear – Wheel
Patent
1994-11-18
1996-08-20
Kashnikow, Andres
Aeronautics and astronautics
Landing gear
Wheel
188376, 244104R, 244138R, 244100R, B64L 2558
Patent
active
055471480
ABSTRACT:
A shock strut assembly for an aircraft landing gear includes a trunnion fitting, a compressible oleo strut subassembly, a wheel subassembly, an energy dissipating subassembly, and a mechanical load control subassembly. The oleo strut subassembly includes a cylinder member having an upper end mounted in combination with the trunnion fitting by means of the mechanical load control subassembly and a piston member having a lower end affixed in combination with the wheel subassembly and an upper end slidably inserted in the cylinder member. The energy dissipating subassembly includes a cylindrical cutter member secured in combination with the cylinder member and the trunnion fitting and a frangible tube member mounted in concentric combination with the cylinder member so that the lip of the upper end thereof is disposed in abutting engagement with the cutter member. The mechanical load control subassembly includes a shear ring, a retainer nut, complementary flange cutouts formed in the endface of the cylinder member, and complementary torsion key slots formed in the trunnion fitting. The shear ring has a configuration that segregates the landing forces induced in the shock strut assembly during landings and includes a cylindrical body having opposed shear flanges extending outwardly therefore. Each shear flange includes a torsion key. The shear ring is mounted in locked combination with the cylinder member and the trunnion fitting by means of the threaded engagement of the retainer nut with the trunnion fitting wherein the retainer nut engages the shear flanges. In the locked configuration, the cylindrical body abuts the cylinder member, the shear flanges engage the complementary flange cutouts of the cylinder member and the torsion keys are disposed in the complementary torsion key slots. During normal landing, the shear ring prevents movement of the cylinder member with respect to the trunnion fitting. In a crash landing, the shear flanges shear at a predetermined axial load failure limit, which allows the cylinder member to be displaced relative to the trunnion fitting. Displacement of the cylinder member causes the frangible tube member to interact with the cutter member, causing fracturing of the frangible tube member for crash landing energy dissipation.
REFERENCES:
patent: 2731218 (1956-01-01), Bonar
patent: 3143321 (1964-08-01), McGehee et al.
patent: 3236333 (1966-02-01), Mitchell
patent: 3997133 (1976-12-01), Fagan
Barone Ralph P.
Del Monte Berardino
Dinh Tien
Kashnikow Andres
Radke Terrance J.
United Technologies Corporation
LandOfFree
Crashworthy landing gear does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Crashworthy landing gear, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crashworthy landing gear will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2324921