Patent ID: 6945205

Claim:
Internal-combustion engine with a hydraulic device ( 1 ) for adjusting the rotation angle of a camshaft ( 2 ) relative to a crankshaft, comprising: a rotor ( 7 ) with an impeller form, which is rotationally fixed via an axial central screw ( 6 ) to the camshaft ( 2 ), a stator ( 4 ), which rotates synchronously with a drive wheel ( 3 ) driven by the crankshaft, wherein on both sides of impeller blades ( 15 , 15 ′, 15 ″) located on the rotor, there are pressure chambers ( 16 , 16 ′, 16 ″, 17 , 17 ′, 17 ″), which are each limited by radial walls ( 14 , 14 ′, 14 ″) of the stator ( 4 ) and which can be filled with and emptied of hydraulic fluid by a hydraulic system, wherein the hydraulic fluid is guided, on one hand, via an annular gap ( 13 ) between the rotor ( 7 ) and central screw ( 6 ) and, on the other hand, by generally axially extending channels and radial channels into the pressure chambers ( 16 , 16 ′, 16 ″, 17 , 17 ′, 17 ″), wherein the rotor ( 7 ) has a groove ( 10 ) extending in a circumferential direction from a camshaft-side end thereof, in which at least one first, axial channel ( 23 ) of the cramshaft ( 2 ) opens, and first, radial channels ( 18 , 18 ′, 18 ″) emerge from the groove ( 10 ).