Hydraulic system for a differential piston type cylinder

Details Hydraulic system for a differential piston type cylinder Hydraulic system for a differential piston type cylinder

1991-03-15

1993-01-19

Look, Edward K.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of...

60445, 60475, 60486, 60414, F15B 1108, F15B 1309

Patent

active

051798360

ABSTRACT:
A first cylinder chamber of a hydraulic cylinder is connected to a pair of variable displacement pumps of which the first one is connected to a reservoir and second one is connected to the second cylinder chamber. This allows to bias the piston by a hydraulic force acting on either side of the piston corresponding to the direction of motion. This is obtained by adjusting the delivery volume of both the pumps such that the volume supplied is larger than the volume drained. Metering the difference of both the delivery volumes results in the desired biasing counter-pressure.

REFERENCES:
patent: 1972560 (1934-09-01), Heller
patent: 3864911 (1975-02-01), Gellatly et al.
patent: 4342164 (1982-08-01), Claassen
patent: 4707988 (1987-11-01), Palmers
patent: 4928487 (1990-05-01), Nikolaus
patent: 4961316 (1990-10-01), Corke et al.
Japanese Abstract appl. No. 57-196814 dated Nov. 11, 1982.
Japanese Abstract appl. No. 57-196815 dated Nov. 11, 1982.
Japanese Abstract appl. No. 57-195309 dated Sep. 11, 1982.
Hydraulics & Pneumatics article pp. 69-70 dated May 1975.

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