Patent ID: 6796120
Filing Date: 2004-09-28
Classification: B64C,F15B,Y02T

Abstract:
An electrohydraulic actuator comprising:a hydraulic actuator comprising a piston secured to a member to be controlled and capable of moving in a cylinder under drive from a hydraulic fluid; a swash-plate pump comprising a cylinder system containing axial pistons and a swash-plate for feeding both faces of said piston with hydraulic fluid via channels integrated in the walls of said cylinder; an electric motor immersed in the hydraulic fluid, and controlled and powered electrically by an electronic control unit, driving said hydraulic pump in rotation; a hydraulic accumulator for compensating variations in the volume of the hydraulic fluid; and balance means for eliminating the unbalance caused by the swash-plate when the actuator is set into rotation; wherein said hydraulic actuator, said swash-plate pump, said electric motor, and said hydraulic accumulator have a common axis of symmetry and are mounted in alignment in a common housing that is leaktight to the hydraulic fluid, thereby forming a balanced axially symmetrical self-contained hydraulic assembly.