Electromechanical actuator pump

A method of operating a nose landing gear system, comprising:

• driving an electric motor connected to a unidirectional hydraulic pump and to a gearbox wherein the unidirectional hydraulic pump provides an output fluid flow from a fluid output of the unidirectional hydraulic pump regardless of a direction the electric motor is turning;
• circulating, via the unidirectional hydraulic pump, a hydraulic fluid within a recirculation hydraulic circuit connecting the fluid output of the unidirectional hydraulic pump to a fluid inlet of the unidirectional hydraulic pump through a directional control valve in a neutral position;
• and
• steering a nose landing gear assembly via the gearbox and a clutch,
• wherein the unidirectional hydraulic pump is configured for connection with one or more of a retract actuator, an uplock actuator, a downlock actuator and a door actuator,
• wherein the directional control valve is fluidly coupled to the unidirectional hydraulic pump and to the one or more of the retract actuator, the uplock actuator, the downlock actuator and the door actuator and
• wherein the recirculation hydraulic circuit that connects the fluid output to the fluid inlet comprises the directional control valve in the neutral position.

An electromechanical actuator for steering a nose landing gear system, comprising:

• an electric motor;
• a gearbox connected to the electric motor;
• a clutch configured to mechanically couple the gearbox to a steering collar;
• and
• a clutch control valve fluidly coupled to the clutch and configured to receive a pressurized hydraulic fluid from an accumulator to engage or disengage the clutch with or from the steering collar,
• wherein a unidirectional hydraulic pump provides an output fluid flow from a fluid output of the unidirectional hydraulic pump regardless of a direction that the electric motor is turning, wherein the unidirectional hydraulic pump connected to the electric motor is configured for connection with one or more of a retract actuator, an uplock actuator, a downlock actuator and a door actuator,
• wherein a directional control valve is fluidly coupled to the fluid output and a fluid input of the unidirectional hydraulic pump and to the one or more of the retract actuator, the uplock actuator, the downlock actuator and the door actuator and
• a recirculation hydraulic circuit that fluidly couples the fluid outlet of the unidirectional hydraulic pump to the fluid inlet of the unidirectional hydraulic pump through the directional control valve in a neutral position, wherein the directional control valve provides the recirculation hydraulic circuit when in the neutral position.