Patent ID: 7984873

Claim:
Retraction cylinder ( 20 ) for retracting a leg ( 10 ) of a rotorcraft landing gear, the said retraction cylinder ( 20 ) comprising a retraction chamber ( 33 ) and an extension chamber ( 34 ) separated by a head ( 26 ) of a piston ( 25 ), the said piston ( 25 ) sliding in a cylindrical sheath ( 35 ) having a plurality of radial bores ( 35 ′) placed along the length of the cylindrical sheath ( 35 ), wherein a return means ( 23 ) and a control chamber ( 22 ) filled with a first fluid, the said control chamber ( 22 ) being separated from the said return means ( 23 ) by a movable release member ( 24 ), the said movable release member ( 24 ) sliding so that the retraction cylinder ( 20 ) fulfills a damping function when a control pressure exerted by the said first fluid on the said movable release member ( 24 ) is greater than a return pressure exerted by the said return means ( 23 ), and in that the said retraction cylinder ( 20 ) is furnished with a hydraulic pipe ( 21 ) capable of connecting the said control chamber ( 22 ) to a compression chamber ( 15 ) of a damper ( 14 ) arranged on a rotorcraft landing gear leg ( 10 ).