Patent ID: 7198013
Filing Date: 2007-04-03
Classification: F01L,F02D

Abstract:
1. Device for adjusting the relative angle of rotation of a camshaft with respect to a crankshaft of an internal combustion engine, with a hydraulically activated actuating element, through adjustment of which a phase position of the camshaft can be directly or indirectly changed, whereby the actuating element is bordered by two pressure chambers, which pressure chambers can be loaded with or relieved of hydraulic fluid via control lines, and with a control valve, which, depending upon the operating state of the internal combustion engine, forces a flow of hydraulic fluid that is forced from a hydraulic fluid reservoir by a pump via a first control line to a first pressure chamber, while hydraulic fluid from a second pressure chamber is returned to the reservoir via a second control line, and vice versa, wherein at least one bypass is arranged between the two pressure chambers and controlled by a pressure difference between pressures in the pressure chambers so that the bypass is open when the pressure in the first pressure chamber, which is loaded with hydraulic fluid, is lower than the pressure in the second pressure chamber, from which hydraulic fluid is relieved, and wherein the bypass is integrated into the actuating element.