Linear electromechanical actuator and anti-jamming device

摘要

Linear electromechanical actuator with a main screw-nut assembly driven by a main motion device and having a hollow screw with an abutting surface; an anti-jamming piston arranged coaxially within the hollow screw and shiftable between an engaged position in which a plurality of locking dogs interfere with the abutting surface and a disengaged position in which the anti-jamming piston is free to slide within the hollow screw; and actuating means configured to shift the anti-jamming piston from the engaged position to the disengaged position upon electrical or mechanical failure of the linear electromechanical actuator. The actuating means include a key axially movable between the engaged and the disengaged positions and having a locking section, configured to bias the locking dogs into interference with the abutting surface in the engaged position, and an unlocking section, configured to allow free sliding of the anti-jamming piston within the hollow screw in the disengaged position. Another aspect refers to an anti-jamming device for operating a critical flight control surface.