CENTERLINE-MOUNTED HYDRAULIC PITCH CHANGE MECHANISM ACTUATOR AND CORRESPODNING METHOD

摘要

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 24) of the hydraulic fluid transfer sleeve 220.