Abstract A dual integrated electro hydraulic actuator package for remotely controlling the position of an aircraft control surface has both its input power and its input command signals supplied solely by wires from remote locations. The package encloses two complete and separate hydraulic actuators mechanically connected together to drive a load and includes duplicate sets of electro hydraulic drive components and electro hydraulic control components, one for each actuator. The load on the actuators is divided equally by means of metering valves, one for each direction of actuation, which compare the pressures in the two actuators and adjust the control system for the driving components to maintain these loads equal. Blocking valves are provided to cut out the action of the metering valves whenever one or the other of the electro hydraulic driving means is disabled, thus permitting the other actuator and its driving means to carry the entire load.
In a dual integrated actuator package comprising dual hydraulic actuators mechanically connected together and to a load to be selectively positioned by remote control, dual rotary electric prime movers, dual reversible variable displacement hydraulic pumps driven separately by the prime movers and each separately driving an actuator, and dual electro hydraulic servo controllers each controlling separately the displacement of a hydraulic pump, that improvement which comprises a pair of metering valve means, one being responsive oppositely to the pressures in the actuators to modulate the action of each servo controller for one direction of actuator motion, the other being responsive oppositely to pressures in the actuators to modulate the action of each servo controller for the other direction of actuator motion whereby the load is divided equally between the actuators.
Claim 2
Dependent Claim
130 words
In a dual integrated actuator package comprising dual hydraulic actuators mechanically connected together and to a load to be selectively positioned by remote control, dual rotary electric prime movers, dual reversible variable displacement hydraulic pumps driven separately by the prime movers and each separately driving an actuator, and dual electro hydraulic servo controllers each controlling separately the displacement of a hydraulic pump, that improvement which comprises a pair of metering valve means, one being responsive oppositely to the pressures in the actuators to modulate the action of each servo controller for one direction of actuator motion, the other being responsive oppositely to pressures in the actuators to modulate the action of each servo controller for the other direction of actuator motion whereby the load is divided equally between the actuators.
Claim 3
Dependent Claim
70 words
An integrated actuator package as defined in claim 1 wherein each servo controller includes an auxiliary pump driven by a prime mover, and the package includes a pair of blocking valve means, each normally held in open position by the opposing pressures of the auxiliary pumps and effective when shifted by a loss of pressure at one auxiliary pump to block the action of one of the metering valve means.