초록 ▼

An electrohydraulic proportional actuator for converting an electrical input signal to proportional mechanical output. Fluid power may be derived from pressurized fuel or lubricating oil of an associated engine. The actuator may be used to drive any engine function requiring modulated control. The m

An electrohydraulic proportional actuator for converting an electrical input signal to proportional mechanical output. Fluid power may be derived from pressurized fuel or lubricating oil of an associated engine. The actuator may be used to drive any engine function requiring modulated control. The mechanical output is proportional to the electrical input. The actuator includes mechanical feedback to linearize the response function, thus eliminating the need for closed loop operation of the system in which the actuator is used. Both linear and rotary actuators are disclosed in various embodiments. Each type is capable of operation with either a proportional solenoid and valve or a force rebalance solenoid and valve.

대표청구항 ▼

Electrohydraulic proportional actuator apparatus comprising: a rotary valve and rotary hydraulic actuator mounted and interconnected within a housing, the valve having a torque signal input shaft including a hollow portion defining a longitudinally extending first fluid passage and a sleeve member s

Electrohydraulic proportional actuator apparatus comprising: a rotary valve and rotary hydraulic actuator mounted and interconnected within a housing, the valve having a torque signal input shaft including a hollow portion defining a longitudinally extending first fluid passage and a sleeve member surrounding the shaft hollow portion and spaced from the shaft outer surface by spacing means to define a longitudinally extending, circumferential second fluid passage, the actuator having an output shaft coupled to a motive member, the spacing means comprising a pair of tubular spacers at opposite ends of the second fluid passage; means for coupling the valve to a supply of pressurized fluid, the valve being movable relative to the motive member between a null position and respective flow positions for applying pressurized fluid via one of said first and second passages selectively to one side or the other of the motive member; a transducer coupled to drive the valve to a selected flow position corresponding to an electrical signal applied to the transducer; and means response to the movement of the motive member for restoring the valve to its null position upon the motive member reaching a position corresponding to the electrical signal applied to the transducer.