Electro-hydrostatic actuator excellent in snubbing characteristic, and drive device used for the same, and control method used for the same

Abstract

The present invention is to provide an electro hydrostatic actuator excellent in a snubbing characteristic including a cylinder type actuator main body, a pistonhaving a piston rod, the piston slidingly moving in a cylinder of the actuator main body, a motor, a pumpfor supplying fluid according to the rotation of the motor, a mechanism for adjusting a running amount of the fluid into and from the cylinder according to the motion of the piston, and a reservoirfor adjusting the supply of the fluid corresponding to a volume difference generated according to the motion of the piston, and a controllerwhich controls the number of revolutions of the motor according to the calculated load torque, and a snubbing control method used for this. An electro hydrostatic actuator of realizing a snubbing mechanism capable of increasing energy efficiency, when used for a landing gear retraction/extension device of an airplane, can be provided.