Patent ID: 7013854

Claim:
A device for the hydraulic adjustment of the angle of rotation of a camshaft in relation to a crankshaft of an internal combustion engine, comprising: a hydraulic actuator that can be controlled dependent on various operating parameters of the internal combustion engine located at a drive-side end ( 2 ) of a camshaft ( 3 ) mounted in a cylinder head of the internal combustion engine; the hydraulic actuator including a drive unit ( 4 ) that stands in a driven connection with the crankshaft via a traction device, as well as an output unit ( 5 ) that is connected in rotationally fixed fashion with the camshaft ( 3 ) and is enclosed by the drive unit ( 4 ); the drive unit ( 4 ) stands in a force-transmitting connection with the output unit ( 5 ) of the device ( 1 ) via at least two pressure chambers ( 6 , 7 ) that are formed inside the device ( 1 ) and that can be charged alternately or simultaneously with a hydraulic pressure medium; supply and conducting away of pressure medium to and from the pressure chambers ( 6 , 7 ) of the device ( 1 ) takes place from a camshaft-remote side of the device ( 1 ) via a separate distributor housing ( 8 ) that is fastened to the cylinder head of the internal combustion engine; the distributor housing ( 8 ) has a receptacle ( 9 ) that is suitable for insertion of an electromagnetic hydraulic valve for controlling the device ( 1 ), and a connecting flange ( 10 ) that is suitable for transmission of the pressure medium to the device ( 1 ); the receptacle ( 9 ) of the hydraulic valve is connected to a connecting flange ( 10 ) of the distributor housing ( 8 ) via two separate pressure medium conduits ( 11 , 12 ), and has respective connections to a pressure medium supply and to a pressure medium reservoir of the internal combustion engine; the output unit ( 5 ) of the device ( 1 ) is fastened non-positively, positively, or by a material bond to a segment ( 14 ) of the camshaft ( 3 ), which passes axially through the device with the drive-side end ( 2 ) thereof and has a hollow space at least at the drive-side end ( 2 ); an end segment ( 13 ) of the camshaft ( 3 ) protruding from the device ( 1 ) being enclosed by the connecting flange ( 10 ) of the distributor housing ( 8 ) and having radial bores ( 17 , 18 ) that are connected to the pressure medium conduits ( 11 , 12 ) in the connecting flange ( 10 ); said bores standing in pressure medium connection, via a distributor insert ( 22 ) that placed into the hollow space ( 21 ) of the camshaft ( 3 ) and arrested therein in a rotationally fixed fashion, with additional radial bores ( 19 , 20 ) that are connected to pressure medium conduits ( 15 , 16 ) in the output unit ( 5 ).