Electro-hydraulic servo actuator with function for adjusting rig

Details Electro-hydraulic servo actuator with function for adjusting rig Electro-hydraulic servo actuator with function for adjusting rig

1988-12-12

1990-08-14

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

92 60, 73745, F15B 1316

Patent

active

049477323

ABSTRACT:
An electro-hydraulic servo actuator with function for adjusting rigidity. The electro-hydraulic servo actuator comprises an electro-hydraulic transducer which transduces an electric signal into a hydraulic signal, an actuator of a cylinder type which is operated by the electro-hydraulic transducer, and a position detector which detects a position of an output member of the actuator to emit a positional electric signal. The hydraulic-element transducer is a bias piston which is disposed within a actuator rod of the cylinder type actuator and which floats in response to a differential pressure within the cylinder, and the piston is connected to the position detector. The electro-hydraulic servo actuator further comprises an adder which compares the positional signal from the position detector with a command signal to emit a deviation signal, the deviation signal from the adder being applied to the electro-hydraulic transducer, and a hydraulic-electric transducer which detects hydraulic pressure in the actuator and which applies a signal corresponding to the hydraulic pressure to a portion between the detector and the adder to transduce into an electric signal.

REFERENCES:
patent: 3487750 (1970-06-01), Borgeson
patent: 4537547 (1985-08-01), Cole
patent: 4700610 (1987-10-01), Bauer et al.
patent: 4712570 (1987-12-01), Schmitz
patent: 4817498 (1989-04-01), Takagi

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