Patent ID: 6625982
Filing Date: 2003-09-30
Classification: B64C,F15B

Abstract:
An electrically controlled hydraulic actuating system comprising:a servocontrol, intended to control at least one moving part and comprising a cylinder inside which a piston to which said moving part is connected can move, said piston dividing said cylinder into two chambers, each of which is provided with a hydraulic connection port, and said servocontrol being provided with a control valve connected to a hydraulic circuit in which a hydraulic fluid under pressure circulates; a two-way hydraulic pump, driven in rotation by an electric motor driven by power electronics; and a switching device allowing said connection ports of the chambers to be connected either to said control valve or to said pump, wherein: said switching device is additionally able to connect said hydraulic connection ports of the chambers both to said control valve and to said pump, so as to allow said servocontrol to be supplied the sum of the hydraulic power delivered by said hydraulic circuit and of the hydraulic power, of electrical origin, generated by said pump actuated by said electric motor, and said switching device comprises a first and of a second selector, with specific controls; said first selector is inserted between said control valve and said hydraulic connection ports, while the second selector is arranged between the latter and said pump; and the specific controls of said first and second selectors allow said hydraulic connection ports to be connected not only to said control valve or to said pump, but also to both said control valve and said pump.