| 摘要 |
Axially spaced apart counter-rotatable forward and aft rows (21, 23) of forward and aft propellers (22, 24) mounted on forward and aft rotatable frames (52, 54) includes a flowpath (80) passing through the forward and aft rotatable frames (52, 54). Hydraulic rotary forward and aft pitch change actuators (86, 88) mounted on the aft rotatable frames (52, 54) are connected to and operable for controlling and setting pitch of the aft propellers (22, 24). The pitch change actuators (86, 88) are mounted radially inwardly of the flowpath (80) in a one to one ratio with forward and aft rotatable struts (82, 84) extending radially across the flowpath (80). One or more rotatable shafts (92, 94) extend through one or more of the rotatable struts (82, 84) and connect one or more of the pitch change actuators (86, 88) to one or more of the propellers (22, 24). The pitch change actuators (86, 88) may be ganged together by unison rings (600, 610) having ring teeth (602) engaging gear teeth (604) on gears (606, 616) connected to the pitch change actuators (86, 88) or connected to the rotatable shafts (92, 94). |
