Patent ID: 6895913

Claim:
Internal-combustion engine with a hydraulic device for rotation angle adjustment of a camshaft relative to a crankshaft, comprising: the hydraulic device ( 1 ) for adjusting the rotation angle is arranged on a drive-side end ( 2 ) of the camshaft ( 3 ) supported by several radial bearings ( 4 ) in a cylinder head ( 5 ) of the internal-combustion engine and is formed as a hydraulic actuating drive, the hydraulic device ( 1 ) includes a drive unit ( 6 ) drivingly connected with the crankshaft of the internal-combustion engine and of a driven unit ( 7 ) rotationally fixed to the camshaft ( 3 ) of the internal-combustion engine, the driven unit ( 7 ) is mounted by an axial central fastener ( 8 ) on the camshaft ( 3 ) and the drive unit ( 6 ) is formed as a hollow cylinder, which surrounds the driven unit ( 7 ) and which is sealed from a pressurized medium by two axial side walls ( 10 , 11 ), the drive unit ( 6 ) is in force-transfer connection with the driven unit ( 7 ) of the device ( 1 ) through at least two pressure chambers ( 12 , 13 ), which are formed within the device ( 1 ) and which can be charged with a hydraulic pressurized medium alternately or simultaneously, the hydraulic pressurized medium is fed from one of the radial bearings ( 4 ) of the camshaft ( 3 ) and guided via first and second radial bore holes ( 14 , 15 ) and also via first and second axial channels ( 16 , 17 ) in the camshaft ( 3 ) first to a end ( 18 ) of the camshaft ( 3 ), the first and second axial channels ( 16 , 17 ) in the camshaft ( 3 ) are in pressurized connection via first and second axial channels ( 19 , 20 ) and also via first and second radial bore holes ( 21 , 22 ) in the driven unit ( 7 ) of the device ( 1 ) with the pressure chambers ( 12 , 13 ), wherein at least the first axial channels ( 16 ) formed as coaxial bore holes in the camshaft ( 3 ) and the first axial channels ( 19 ) in the driven unit ( 7 ) of the device ( 1 ) are connected to each other by a ring-shaped pressurized medium adapter ( 23 , 23 ′) arranged between the end ( 18 ) of the camshaft ( 3 ) and the driven unit ( 7 ) of the device ( 1 ), which is formed on a device-side end ( 24 , 24 ′) with through holes ( 25 , 25 ′) produced in a same number and arrangement as the first axial channels ( 19 ) in the driven unit ( 7 ) and has in a camshaft-side end ( 26 , 26 ′) at least one annular groove ( 27 , 27 ′) connecting the through holes ( 25 , 25 ′) to each other.