Method and apparatus for minimizing axial friction forces in a c

Details Method and apparatus for minimizing axial friction forces in a c Method and apparatus for minimizing axial friction forces in a c

1975-12-04

1977-02-15

Blix, Trygve M.

Aeronautics and astronautics

Landing gear

Wheel

177141, 267 64R, B64C 2560

Patent

active

040078949

ABSTRACT:
The weight and balance of an aircraft is determined by measuring the pressure of a fluid in a variable volume chamber provided in a piston-cylinder shock absorber assembly of the landing gear strut. In order to minimize axial friction forces in the assembly that introduce errors in an otherwise accurate correlation between the measured fluid pressure and the magnitude of the aircraft load, an existing hollow cylindrical bearing structure, coaxially disposed between the piston and cylinder for guiding reciprocation of the former within the latter, is modified so that it can be rotated about the axis of the assembly. An actuator is provided on the strut for rotating the bearing structure with respect to the cylinder and piston. Such rotation minimizes axial friction forces in the assembly, allowing the fluid pressure to assume a value accurately reflecting the axial load.

REFERENCES:
patent: 3652040 (1972-03-01), Hartel

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