Patent ID: 7051690

Claim:
Internal-combustion engine with a device for hydraulically adjusting an angle of rotation of a camshaft of the engine relative to a crankshaft of the engine, as well as with a vacuum pump for a servo load, comprising the device ( 1 ) for hydraulically adjusting the angle of rotation is arranged on a drive-side end ( 2 ) of the camshaft ( 3 ) supported in several radial bearings ( 4 ) in a cylinder head ( 5 ) of the internal-combustion engine and is formed as a hydraulic actuator, the device ( 1 ) includes a drive unit ( 6 ) connected in a driving manner to the crankshaft of the internal-combustion engine and a driven unit ( 7 ) connected in a torsion-proof manner to the camshaft ( 3 ) of the internal-combustion engine, the driven unit ( 7 ) is fixed by an axial central screw ( 8 ) on the camshaft ( 3 ) and the drive unit ( 6 ) is provided as a hollow cylinder, which surrounds the driven unit ( 7 ) and which is sealed tight relative to a pressurizing medium by two axial side walls ( 12 , 13 ), the drive unit ( 6 ) is connected in a force-transferring manner to the driven unit ( 7 ) of the device ( 1 ) through at least two compression chambers, which are formed within the device ( 1 ) and which can be pressurized alternately or simultaneously with a hydraulic pressurizing medium, a lubricating oil of the internal-combustion engine taken from one of the radial bearings ( 4 ) of the camshaft ( 3 ) is used as the hydraulic pressurizing medium for the device ( 1 ), and is supplied via radial and axial oil channels ( 15 , 16 ) into the camshaft ( 3 ) of the device ( 1 ), the vacuum pump ( 17 ) for the servo load comprises a vane pump and includes a housing ( 19 ) connected to the cylinder head cover ( 18 ) of the internal-combustion engine and a rotor arranged therein with a drive shaft ( 20 ), the drive shaft ( 20 ) projects toward the cylinder head ( 5 ) of the internal-combustion engine and includes an end-face coupling ( 22 ) for a transfer of rotational movement of the camshaft ( 3 ) to the vacuum pump ( 17 ), as well as lubrication of the vacuum pump with the lubricating oil of the internal-combustion engine, the vacuum pump ( 17 ) is arranged in an axial direction relative to the device ( 1 ) on a common longitudinal axis and the device ( 1 ) is includes an additional coupling element for connection with the drive shaft ( 20 ) of the vacuum pump ( 17 ) in a driving manner to the device ( 1 ), the lubrication of the vacuum pump ( 17 ) is provided via a central connecting tube ( 23 ) arranged in the drive shaft ( 20 ) of the vacuum pump that projects into the device ( 1 ) which receives the lubricating oil of the internal-combustion engine delivered to the device ( 1 ) as the pressurizing medium.