Patent ID: 7578275
Filing Date: 2009-08-25
Classification: F01L

Abstract:
1. A device for variably adjusting the control times of gas exchange valves in an internal combustion engine comprising: an output element driving a camshaft, an input element driven by a crankshaft, a hydraulic actuator with at least two reciprocally operating pressure chambers, and a device for supplying pressure medium for a supply to and withdrawal of pressure medium from the pressure chambers, the input element being rotatable relative to the output element and phasing between the input and output elements can be selectively held or adjusted by supplying and withdrawing pressure medium to and/or from the pressure chambers, at least one rotation angle limiting device, which does not limit phasing of the output element in reference to the input element in an unlocked state and in a locked state limits phasing to a defined angular range or a defined angle, the at least one rotation angle limiting device being switchable from the locked into the unlocked state by a supply of pressure medium, a control line for supplying and withdrawing pressure medium to or from at least one the rotation angle limiting device, with the control line not communicating with the pressure medium supply device and a control valve allowing in an operating state the supply of pressure medium to and in an idle state a removal of pressure medium from the control line, the control valve is provided with a hydraulic actuating mechanism, which is impinged with pressure medium by the pressure medium supply device.