Closed-system electrohydraulic actuator
AssigneeMoog Inc.
InventorDavid Geiger
Life of this patent
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Abstract
An electrohydraulic actuator (10) includes a fluid-powered actuator (11) having a piston (15) in a cylinder (16). The piston divides the cylinder into two opposed chambers (18, 19). The actuator includes a fixed-displacement reversible motor-driven pump (13) having a first port communicating with one of the chambers and having a second port communicating with the other of the chambers in a closed hydraulic system. A pre-charged accumulator (14) communicates with the pump first port. One of the actuator chambers is maintained at a fixed pre-charged pressure of the accumulator, and the operation of the pump controls the pressure in, and volume of, the other chamber.
Claims6
An electrohydraulic actuator, comprising:
- a fluid-powered actuator having a piston in a cylinder, said piston dividing said cylinder into two opposed chambers;
- a fixed-displacement reversible motor-driven pump having a first port communicating with a first of said chambers and having a second port communicating with a second of said chambers in a closed hydraulic system;
- a four-way reversing valve arranged in parallel with said pump;
- and
- a pre-charged fluid-containing accumulator communicating with said first pump port;
- whereby one of said chambers will be at the fixed pre-charged pressure of said accumulator, and the operation of said pump will control the pressure in, and volume of, the other of said chambers.
Dependencies are inferred from the claim text.