Closed-system electrohydraulic actuator

Details Closed-system electrohydraulic actuator Closed-system electrohydraulic actuator

2006-05-30

2006-05-30

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Pump means moves motive fluid from one chamber to an...

C060S476000

Reexamination Certificate

active

07051526

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.

REFERENCES:
patent: 3772889 (1973-11-01), Mason et al.
patent: 4667472 (1987-05-01), Clay et al.
patent: 6477835 (2002-11-01), Geiger
patent: 6519939 (2003-02-01), Duff
patent: 6591607 (2003-07-01), Baumgarten
patent: 6796120 (2004-09-01), Franchet et al.
patent: 6889501 (2005-05-01), Busch

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