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US 6,712,091 B2Granted
Control device for a hydraulic control motor
AssigneeZF Lenksysteme GmbH
InventorJörg Linser
Life of this patent
Estimating the term…
Abstract
A control device for a hydraulic control motor includes at least one valve controlled actively by an actuating force and at least one passive valve which is operatively connected to the actively controlled valve and which is co-controlled via a line.
Claims5
A control device for a hydraulic control motor, comprising:
- a housing;
- an element having a throttle point;
- at least one first valve including a first piston having a stepped diameter, the first piston mounted axially movably and loaded by a first spring, the first valve controllable in accordance with an actuating force, the first piston and the element arranged relative to the housing to form a first pressure space;
- and
- at least one a second valve including a second piston having a stepped diameter, the second piston mounted axially movably and loaded by second a spring, the second piston arranged relative to the housing to form a second pressure space hydraulically connected to the first pressure space via a line so that the second valve is arranged to be co-controlled by the first valve;
- wherein the control device is configured to operate in accordance with an open-center principle;
- and
- wherein at least one of the first piston and the second piston includes a bore configured to feed pressure medium to a respective pressure space, the bore arranged so that the bore is closed when the at least one of the first piston and the second piston is pressed against the housing to avoid leakage.
5 more elements
Dependencies are inferred from the claim text.