HYDRAULIC CIRCUIT FOR ADJUSTING THE TURBINE PITCH

FR3169501A1Pending Publication Date: 2026-06-12SAFRAN AIRCRAFT ENGINES SAS +1
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Patent Information

Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
SAFRAN AIRCRAFT ENGINES SAS
Filing Date
2024-12-11
Publication Date
2026-06-12
Patent Text Reader

Abstract

An actuation system (1) for adjusting the pitch of aircraft engine fan blades (200) comprising a hydraulic cylinder (5), including an isolation valve (71) adapted to selectively adopt a first and a second configuration, such that: - when the isolation valve (71) is in the first configuration, the hydraulic cylinder (5) is configured to be position-controlled by a control fluid from a main hydraulic circuit (4a); and - when the isolation valve (71) is in the second configuration, the piston of the hydraulic cylinder (5) can move in a first direction of travel by the action of a control fluid from an auxiliary hydraulic circuit (4b), the fan blade orienting itself towards a large pitch position, and the auxiliary hydraulic circuit (4b) not being hydraulically connected with the main hydraulic circuit (4a). Figure for the abstract: Fig. 5
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Citation Information

Patent Citations

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    EP0409552A2

  • Device for controlling pitch of blades of non-ducted propeller of turbojet of aircraft, has flow reduction unit to limit flow of fluid leaving chambers under effect of displacement of piston in event of interruption of supply of fluid

    FR2985284A1

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