Patent ID: 7284516

Claim:
In an internal combustion engine, a hydraulic device for adjusting an angle of rotation of a camshaft in relation to a crankshaft comprising: a rotor connected in fixed rotative engagement with the camshaft and having plural vanes in spaced apart relationship to define pressure chambers on both sides of the vanes; a stator connected in fixed rotative engagement with a crankshaft-driven timing pulley and having a substantially cylindrical outer contour, said stator having an end wall and including sidewalls, circumferential inner walls and circumferential outer walls in concentric relationship, said pressure chambers being demarcated by the sidewalls and the outer walls of the segments, said sidewalls, inner walls and outer walls being made without material removal from a single band or sheet metal part; and a hydraulic system for feeding pressure medium to or purging pressure medium from the pressure chambers.