Centerline Mounted Hydraulic Pitch Change Mechanism Actuator

Abstract: A method and system for controlling a pitch of blades (202) of a fan assembly (114) having a centerline axis of rotation (208) is provided. The system includes a pitch change mechanism (PCM) (210) including a hydraulic actuator (212) positioned axisymmetric with respect to the fan assembly (114) and configured to angularly displace the blades (202) of the fan assembly (114) between a first position and a second position. The PCM (210) further includes a plurality of hydraulic fluid supply lines (228) coupled in flow communication between the hydraulic actuator (212) and a hydraulic fluid transfer sleeve (220), the hydraulic fluid transfer sleeve (220) configured to transfer a flow of pressurized hydraulic fluid across a gap (226) between a stationary member (222) of the hydraulic fluid transfer sleeve (220) and a rotatable member (224) of the hydraulic fluid transfer sleeve (220). FIG.1

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