Hydraulic control system for the drive control of a double-actin

Details Hydraulic control system for the drive control of a double-actin Hydraulic control system for the drive control of a double-actin

1989-04-14

1991-08-27

Kwon, John T.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Second path activated in response to pressure or flow in...

91417R, 91436, F15B 1304

Patent

active

050423622

ABSTRACT:
A hydraulic control system for the drive control of a double-acting hydraulic cylinder with a larger driving surface and a smaller countersurface, in which the direction- and movement-controlling valve is provided in the form of a follow-up adjusting valve that operates with an electrically-controlled indication of the set value and with a mechanical announcement of the actual position. The pressure source provides two different supply pressures P.sub.N and P.sub.H. A pressure-controlled pressure-reversing valve is provided to switch to the higher supply pressure as and when this is called for by a growing load. A similarly pressure-controlled surface-reversing valve is also provided and, after the pressure-reversing valve has switched to the higher pressure, will itself switch the hydraulic cylinder from a differential operating mode to a mode in which pressure is applied only to the larger working surface of its piston. Alterntery, after the demand for forward driving force has diminished again, so that the pressure-reversing valve will have switched back to the lower pressure, it will itself switch the hydraulic cylinder back into the differential operating mode.

REFERENCES:
patent: 946481 (1910-01-01), Anderson
patent: 2356366 (1944-08-01), Wise
patent: 3604884 (1971-09-01), Olsson
patent: 4216702 (1980-08-01), Brundidge

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