The invention provides an aircraft electro hydrostatic
brake actuator. The output shaft of a brushless
direct current motor is coaxially connected with a displacement-fixed two-way
plunger pump, a pressurized tank is used for supplying initial pressure for the inlet of the displacement-fixed two-way
plunger pump, one outlet of the displacement-fixed two-way
plunger pump is connected with a
hydraulic cylinder through an
oil filter and a two-position two-way
solenoid valve, the other outlet of the displacement-fixed two-way
plunger pump is connected with the two-position two-way
solenoid valve through the
oil filter and a
relief valve, the
pickup state of the two-position two-way
solenoid valve is controlled by a solenoid valve
control unit, thus switching between
brake pressure tracking and take-off line
brake pressure maintaining functions is realized, the
internal pressure of the
hydraulic cylinder is measured by a pressure measuring unit, the pressure information is transmitted to a controller for pressure closed-
loop control, the controller receives a
brake pressure instruction through an instruction port, to further control the solenoid valve
control unit and the brushless
direct current motor and a brake disc is driven by the
hydraulic cylinder. The aircraft electro hydrostatic brake
actuator is simple in structure, high in efficiency, high in
frequency response and small in size and weight, and take-off line
brake pressure maintaining can be realized for a long time.