Hydraulic system for aircraft landing gear

Details Hydraulic system for aircraft landing gear Hydraulic system for aircraft landing gear

B - Operations, Transporting

64

C

B64C 25/22 (2006.01) F15B 11/024 (2006.01) F15B 13/02 (2006.01) F16K 15/02 (2006.01) F16K 15/18 (2006.01) F16K 17/06 (2006.01) F16K 31/122 (2006.01)

Patent

CA 2386507

A hydraulic system for raising and lowering aircraft landing gear (11, 12) includes an actuator (18) which is extendible and retractable to operate the landing gear, the actuator (18) including a movable member (19) in a casing (20), the movable member (19) being moved relative to the casing (20) in a first direction to extend the actuator (18) when fluid under pressure is supplied to a first side (22) of the movable member (19) whilst fluid is exhausted from a second side (23) of the movable member (19), and the movable member (19) being moved in a second direction to retract the actuator (18) when fluid under pressure is supplied to the second side (23) of the movable member (19) whilst fluid is exhausted from the first side (22) of the movable member (19), and there being selector valve means (25) selectively to supply pressurised fluid to the first (22) or second (23) side of the movable member (19), characterised in that means (40) are provided to permit exhausted fluid from at least one of the first (22) and second (23) sides of the movable member (19) to augment the supplied fluid from the selector valve means (25) and thus be directed with the supplied fluid, to the second (23) or first side (22) respectively of the movable member (19).

L'invention concerne un système hydraulique servant à relever et à abaisser un train d'atterrissage (11, 12) d'avion, qui comprend un vérin (18) qui peut s'étendre et se rétracter pour actionner le train d'atterrissage, ce vérin (18) comprenant un élément mobile (19) placé dans une enveloppe (20). Cet élément mobile (19) peut être déplacé, par rapport à l'enveloppe (20), dans une première direction, correspondant à l'extension du vérin (18), lorsque du fluide sous pression est conduit à un premier côté (22) de cet élément mobile (19), tandis que du fluide est expulsé d'un second côté (23) de cet élément mobile (19). Ledit élément mobile (19) est déplacé dans une seconde direction, pour rentrer le vérin (18), lorsque du fluide sous pression est conduit au second côté (23) dudit élément mobile (19), tandis que du fluide est expulsé du premier côté (22) de cet élément mobile (19). Des soupapes de sélection (25) servent à conduire, de façon sélective, du fluide sous pression au premier côté (22) ou au second côté (23) de l'élément mobile (19). Ce système se caractérise en ce que des moyens (40) servent à permettre au fluide expulsé du premier côté (22) et/ou du second côté (23) de l'élément mobile (19) de venir augmenter la quantité de fluide conduite à partir des soupapes de sélection (25) et ainsi d'être dirigé, avec le fluide conduit, vers le second côté (23) ou le premier côté (22) de l'élément mobile (19).

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