Aeronautics and astronautics – Landing gear – Retractable
Patent
1998-06-10
2000-05-09
Eldred, J. Woodrow
Aeronautics and astronautics
Landing gear
Retractable
244102A, 244102SL, 60381, 60403, 60406, B64C 2510
Patent
active
060592281
ABSTRACT:
A hydraulic system for retracting into and extending out of the body of an aircraft a landing gear for use in taking off and landing, comprises a housing unit which has a hydraulic pump, a hydraulic actuator, a shuttle valve, an emergency valve, an actuator pressure releasing mechanism, and a mechanically locking mechanism accommodated therein. The hydraulic actuator has a piston rod assembly received therein to be reciprocably moved by the hydraulic pump to assume a retraction position and an extended position. The shuttle valve is movable with respect to the housing unit for selectively changing the flow of the hydraulic fluid between the hydraulic pump and the hydraulic actuator. The emergency valve is movable with respect to the housing unit to assume two different positions for selectively changing the flow of the hydraulic fluid between the hydraulic pump and the hydraulic actuator and the flow of the hydraulic pump and the fluid pressure reservoir. The actuator pressure releasing mechanism serves to release the hydraulic pressure in the hydraulic actuator to allow the piston rod assembly to be freely moved with respect to the housing unit toward the extended position of the piston rod assembly. The mechanically locking mechanism is provided selectively to lock the piston rod assembly with the housing unit and to unlock the piston rod assembly from the housing unit to be freely moved.
REFERENCES:
patent: 2331108 (1943-10-01), Ganahl
patent: 2892626 (1959-06-01), Scott et al.
patent: 3107886 (1963-10-01), Bossler, Jr.
patent: 4630788 (1986-12-01), Veaux et al.
patent: 4634082 (1987-01-01), Kendall
patent: 5184465 (1993-02-01), Howard et al.
Koizumi Takashi
Miyajima Kiyoshi
Eldred J. Woodrow
Teijin Seiki Co. Ltd.
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