Safran Landing Systems

Jean-Charles Roger

Jean-Baptiste Kamis

Thomas Prado

A method for filling a hydraulic circuit of an electro-hydrostatic system includes connecting first and third shut-off valves to a discharge valve, and connecting a second shut-off valve to a filling valve, while the second and third shut-off valves are closed, opening the filling valve, the discharge valve and the first shut-off valve and operating a vacuum generator, once a vacuum has been established in the hydraulic circuit, opening the second shut-off valve in order to fill the hydraulic circuit with pressurized hydraulic fluid while the vacuum generator is still in operation, once the hydraulic circuit has been filled with fluid, closing the first shut-off valve and then opening the third shut-off valve in order to bypass the vacuum generator and circulate the fluid through the electro-hydrostatic system until the fluid contained in the hydraulic circuit reaches a predetermined pressure, and closing the discharge valve and the filling valve.

Method for filling a hydraulic circuit of an electro-hydrostatic system using a filling device

The invention relates to a hydraulic actuator comprising a cylinder () in which a piston () secured to a rod () is mounted so as to slide in a sealed manner in order to delimit in the cylinder a hydraulic extension chamber () and a hydraulic retraction chamber () that are connected to respective ports, the hydraulic actuator comprising means for slowing the piston when the piston approaches a retracted position. According to the invention, the slowing means comprise first and second hydraulic lines () extending between the extension port and the extension chamber, the first hydraulic line comprising a seat () while the piston bears a retractable finger () having an end () that comes to bear against the seat in order to close the first hydraulic line () when the piston approaches the retracted position, such that only the second hydraulic line () remains open while the piston completes its travel towards the retracted position. Landing gear and aircraft comprising such an actuator.

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Moissy-Cramayel, France

Jean-Charles Roger