Patent ID: 6513473
Filing Date: 2003-02-04
Classification: F01L

Abstract:
A hydraulic camshaft adjusting device of a rotary piston type for varying valve timing of gas exchange valves in an internal combustion engine, said device being fixed on a drive-side end of a camshaft mounted in a cylinder head of the internal combustion engine while being generally configured as a hydraulic adjusting drive comprising:a drive pinion connected in driving relationship to a crankshaft of the internal combustion engine and a winged wheel connected rotationally fast to the camshaft of the internal combustion engine, said drive pinion comprising a hollow space defined by a hollow cylindrical circumferential wall and two side walls, a plurality of hydraulic working chambers being formed in the hollow space by a plurality of radial limiting walls, a plurality of radial wings arranged on an outer periphery of a wheel hub of the winged wheel, said wings extending individually into the working chambers and dividing the working chambers into first and second oppositely acting hydraulic pressure chambers, a selective or simultaneous pressurizing of the pressure chambers by a hydraulic pressure medium effects a pivoting or a fixing of the winged wheel relative to the drive pinion, and thus, of the camshaft relative to the crankshaft, wherein a supply and discharge of the hydraulic pressure medium to and from the pressure chambers of the device is effected through radial grooves that are made in side walls of the drive pinion and open with first ends into the pressure chambers, second ends of the radial grooves open into further pressure medium ducts of the device, and the radial grooves are sealed pressure medium-tight between the first and second ends by lateral surfaces of the wheel hub of the winged wheel.