ELECTRO HYDROSTATIC ACTUATOR
ELECTRO HYDROSTATIC ACTUATOR
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There is provided an electro hydrostatic actuator comprising a hydraulic pump driven by an electric motor to supply hydraulic fluid to a hydraulic actuator, the pump comprising an inlet and an outlet for the hydraulic fluid and an active flow path configured therebetween such that, in an active mode of operation when the pump is driven by the electric motor, hydraulic fluid is actively drawn in through the inlet and exhausted out through the outlet. The pump further comprises a bypass flow path configured to open between the inlet and outlet such that, in a damping mode of operation when the pump is not driven by the electric motor, hydraulic fluid is able to pass through the pump along the bypass flow path between the inlet and outlet. The hydraulic pump is a rotary piston pump comprising a pump barrel driven to rotate by a motor shaft. The bypass flow path comprises one or more bypass ports in a bypass port plate which is positioned at the base of the pump barrel and driven to rotate by the motor shaft. In the damping mode of operation the pump barrel and the bypass port plate are configured to axially separate to form the bypass flow path through a gap between the pump barrel and the bypass port plate created by the separation of the pump barrel and the bypass port plate.
Document information
ELECTRO HYDROSTATIC ACTUATOR
ACTIONNEUR ELECTROHYDROSTATIQUE
2019-01-17
Patent
Electronic Resource
English
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