Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Position responsive
Patent
1988-06-17
1989-05-02
Garrett, Robert E.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Position responsive
91 47, 91386, 91385, 91359, 91417R, 91382, F15B 1522
Patent
active
048257451
ABSTRACT:
An electrohydraulic control system for a hydraulic working cylinder, for example of a press, the piston of which has a main working surface and a smaller working surface on the rod side. A low-pressure circuit is provided for the feed or retraction movement of the piston, and a high-pressure circuit is provided for the loading movement at increased feed force and reduced speed. The connection or disconnection of these two circuits, when required, is produced with two 3/2 way valves that are coupled together. To control these control valves, there is provided an electrical reference motor that drives a cam disk which brings about the deflection of the coupled control slide valves of the control valves against a spring. A mechanical feedback is provided via the power piston, so that altogether a closed hydromechanical position control circuit is formed. If there is a difference between theoretical and actual values, this difference produces such a variation of the position of the control valves that via the control system of the low-pressure and high-pressure circuits connected therewith, the system endeavors to correct this difference automatically.
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BW Hydraulik GmbH
Denion Thomas
Garrett Robert E.
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