公开(公告)号：BR8905274A

公开(公告)日：1990-05-22

申请号：BR8905274

申请日：1989-10-17

Applicant: UNITED TECHNOLOGIES CORP

Inventor： MAYO MILLARD G ,  HUSIAK EDWARD H ,  BARNES PHILIP E ,  CARVALHO PAUL A

IPC: B63H3/06 ,  B63H5/10 ,  B64C11/30

Abstract: A propeller system has a pair of hub assemblies (12,14) driven in counter-rotation, each hub assembly having a mechanical pitch change actuator (18,20), each actuator being provided with a pitch lock (60) that rotates simultaneously with the motion of the actuator to allow the actuator to set propeller blade pitch, but locks the propeller blade positionally when not rotating simultaneously with the actuator, and a differential for transmitting a pitch change signal across a rotating gap between the two hub assemblies and for providing power to a means for providing the pitch change signals. A pair of motors (112,114) provide the rotative signal to set the pitch of the blades in each hub assembly. One of the pair of motors drives the actuator towards high pitch and the other motor drives the actuator towards low pitch. A synchronizer (76) coordinates the signals of the first and second motors so that a pitch lock moves simultaneously with the actuator.