Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Reexamination Certificate
2011-08-23
2011-08-23
Lazo, Thomas E (Department: 3745)
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
C060S452000
Reexamination Certificate
active
08001776
ABSTRACT:
The invention relates to a hydraulic circuit arrangement for setting the delivery volume of a pump, with an electrically activatable control-valve unit, by means of which, alternately, an active side of a servo system can be acted upon with pressure and, at the same time, its passive side can be relieved to the tank, and with a device for pressure limiting pressure regulation, which comprises pressure limiting valves, by means of which the working lines of the pump can be connected to the servo lines. To reduce the servo pressure load and improve the reaction time, check valves which shut off in the direction of the servo system are provided, by means of which the two servo sides can be connected in each case to the charge pressure via a relief line. Moreover, the device for Pressure limiting pressure regulation comprises an orifice which can be positioned in a line leading to the passive servo side. The invention relates, furthermore, to a method for pressure.
REFERENCES:
patent: 6082107 (2000-07-01), Schniederjan et al.
patent: 6336324 (2002-01-01), Schniederjan et al.
patent: 6374605 (2002-04-01), Dvorak et al.
Lazo Thomas E
Sauer-Danfoss Inc.
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