公开(公告)号：US20240124125A1

公开(公告)日：2024-04-18

申请号：US18045958

申请日：2022-10-12

Applicant: PRATT & WHITNEY CANADA CORP.

Inventor： Jagoda KRZYWON ,  Benoit LACHANCE ,  James Robert JARVO

IPC: B64C11/38 ,  B64C11/40 ,  F03D7/02 ,  F15B20/00

CPC classification number: B64C11/385 ,  B64C11/40 ,  F03D7/0224 ,  F15B20/008

Abstract: A propeller blade angle control circuit for a turboprop engine includes a propeller control unit controlling a supply of oil to modify an angle of propeller blades, a pump located upstream of the propeller control unit and providing the supply of oil from an engine oil return system to the propeller control unit, and a flow regulator between the pump and the propeller control unit, the flow regulator modulating a supply of oil to the propeller control unit. A bypass, downstream of the pump in the propeller blade angle control circuit, has an inlet fluidly coupled to the pump. The bypass is operable between a closed position and an open position in which a portion of the oil supplied to the propeller control unit is diverted away from the propeller blade angle control circuit. The open position is engaged when an oil pressure reaches a predetermined threshold.

公开(公告)号：US20200039635A1

公开(公告)日：2020-02-06

申请号：US16055549

申请日：2018-08-06

Applicant: PRATT & WHITNEY CANADA CORP.

Inventor： Benoit LACHANCE ,  Ignazio BROCCOLINI

IPC: B64C11/38

Abstract: The variable pitch propeller control system can have a source of adjustable, actuation hydraulic pressure, a feather valve openable to provide an actuation path of the actuation hydraulic pressure between the source and the actuator, and closeable to connect the actuator to a drain below the actuation hydraulic pressure and close the actuator path, and a bypass path parallel to the actuator path, the bypass path having a restricted flow area relative to a flow area of the actuator path.