Patent ID: 6418893
Filing Date: 2002-07-16
Classification: F01L

Abstract:
A hydraulic camshaft adjusting device of a rotary piston type, comprising:the device is disposed on a drive-proximate end of a camshaft mounted in a cylinder head of an internal combustion engine and generally comprises a drive pinion configured as an outer rotor and a winged wheel configured as an inner rotor; the drive pinion is in driving relation with a crankshaft of the internal combustion engine through a circumferential gearing, and the winged wheel is fixedly mounted on the camshaft; the drive pinion comprises a hollow cylindrical circumferential wall, a camshaft-distal side wall and a camshaft-proximate side wall, said circumferential and side walls being connected to one another and together defining a hollow space; at least one hydraulic working chamber is formed in the hollow space of the drive pinion by at least two limiting walls that start from an inner side of the circumferential wall and extend in radial direction toward a central longitudinal axis of the device; a hub of the winged wheel comprises at least one wing on a periphery thereof which wing extends in radial direction into the working chamber of the drive pinion and divides the working chamber into two hydraulic pressure chambers; a rotation or a fixing of the winged wheel relative to the drive pinion, and thus also of the camshaft relative to the crankshaft, is effected respectively by a selective or a simultaneous pressurization of the pressure chambers with a hydraulic pressure medium; the camshaft-proximate side wall of the drive pinion is configured as a weight- and design space-saving thin-walled component which is shaped out of a circular blank and at least partially surrounds the circumferential wall of the drive pinion while comprising a bent edge region that is bent at least almost at a right angle; the camshaft-distal side wall, the circumferential wall and the gearing of the drive pinion are fixed by common fastening to one another, and the camshaft-proximate side wall is undectachably fixed on the drive pinion by a separate connection that increases an axial stiffness of the camshaft-proximate side wall; the circumferential wall of the drive pinion comprises on am outer side a circumferential, enlarged diameter connecting flange on whose rear side the camshaft-distal side wall having a diameter equal to the diameter of the connecting flange, and on whose front side the gearing of the drive pinion are secured by common screws, said gearing being configured as an annular toothed belt pulley and comprising a plurality of radial securing flanges.