Hydraulic actuator and accumulator arrangement
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United States of America Patent
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Feb 16, 2021
Grant Date -
Aug 9, 2018
app pub date -
Feb 5, 2018
filing date -
Feb 6, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A landing gear system for an aircraft includes a retractable landing gear assembly, a hydraulic actuator for actuating movement part, for example a bogie of the landing gear assembly, and an accumulator associated with the actuator. The accumulator comprises a volume of pressurised gas separated from hydraulic fluid by a separator piston. Travel of the separator piston beyond a certain position is indicative of a fault. The accumulator includes a snubbing device that acts to slow movement of the separator piston beyond that position. A monitoring system measures the time taken for the movement of the landing gear part effected by the hydraulic actuator. If the measured time is longer than a threshold time, that is indicative of a possible fault in the accumulator, that might, without the snubbing, remain undetected and/or hidden from view.
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