All-electric retractable actuator cylinder suitable for laying landing gear down emergently and operating mode thereof

Abstract

The invention discloses an all-electric retractable actuator cylinder which is suitable for laying a landing gear down emergently and an operating mode thereof, and belongs to the technical field of all-electric retractable actuator cylinders for laying landing gears down emergently. The all-electric retractable actuator cylinder comprises a driving nut (5) and a clamping block (6) and a piston rod (7) which are sleeved outside the driving nut (5), wherein the clamping block (6) is loaded and unloaded by force in the piston rod (7) by utilizing driving force which is supplied to the driving nut (5) by a ball screw (4), so that the combination and separation of the piston rod (7) and the ball screw (4) are realized, and the landing gear can be laid down emergently on the premise of meeting a retractable actuating requirement. According to the all-electric retractable actuator cylinder, a set of control systems and the other set of emergently-laid actuating mechanisms are not needed to be designed specially, and the piston rod can be drawn out under the action of the dead weight of the landing gear and wind loads only by unlocking an uplock by utilizing the original circuit control system when the landing gear is laid down emergently, so that the landing gear is laid down without hindrance.

Description

technical field [0001] The invention relates to a working method of an all-electric retractable actuating cylinder suitable for emergency release of landing gear, especially suitable for an all-electrically actuated aircraft without a hydraulic source. Background technique [0002] At present, the retractable actuating mechanism of large aircraft mainly adopts a hydraulic actuator to provide power. When the power source fails, the hydraulic actuator can use the bypass valve (or exhaust valve) to release the pressure, and the landing gear will rest on the ground. The self-gravity and auxiliary pneumatic power can be freely lowered and locked to realize emergency lowering. With the development and progress of technology, electric actuators have been applied in the retraction and retraction of landing gear, especially in small aircraft without hydraulic source, and are listed as the key research content of large all-electric aircraft. The hydraulic cylinder can freely pull out...

AI Technical Summary

Problems solved by technology

The hydraulic cylinder can freely pull out the piston rod from the outer cylinder by unloading the hydraulic pressure when the landing gear is released in an emergency, while the piston rod of the electric cylinder can only drive the screw to rotate to draw the piston out during the emergency release. This method consumes a lot of energy when it is driven by its own weight or wind load, and it cannot make the landing gear lock in the lowered position smoothly, and it may even be stuck in the process of emergency release.

Therefore, it cannot meet the requirements of high reliability on the aircraft

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