Cam phasers are used modern internal combustion engines to optimize consumption and power parameters and are used for controlling opening and closing timing of the gas control valves in order to be able to variably configure a phase relationship between a crank shaft and a cam shaft in a defined angle range between a maximum early position and a maximum late position. For this purpose the cam phaser is integrated into a drive train through which torques are transmitted from the crank shaft onto the cam shaft. The cam phaser thus includes a stator that is driven by the crank shaft and a rotor that is connected torque proof with the cam shaft. Between the rotor and the stator operating cavities are provided that are loadable with a pressure medium and which are divided into counter acting pressure cavities by blades associated with the rotor. During operations of the internal combustion engine both pressure cavities are permanently filled with pressure medium, so that the rotor and the stator are connected with each other in a rather rigid manner. The timing of the gas control valves is adjusted by increasing a pressure in one of the pressure cavities while reducing a pressure in a respective other pressure cavity. Thus, the pressure medium has to be provided to a first pressure cavity and drained from a second pressure cavity towards a tank which adjusts an angular orientation between the cam shaft and the crank shaft.
In the art, in particular the components rotor and stator of the cam phaser are produced from steel or aluminum alloys by a sintering method. In order to provide a correct function of the cam phaser the process steps pressing, coarse machining and sintering are followed by rather complex finishing methods including e.g. calibrating, grinding, fine turning, etc. in order to assure a required parallel alignment of axially opposite surfaces. The finishing processes are expensive and have their quality risks which are only increased by handling steps arranged there between.
DE 10 2013 015 677 A1 provides a solution for the recited disadvantages through a method and a component replacement with two sinter joined components and a radial deformation element. The proposed multi component configuration of the stator or the rotor is considered detrimental due to the number of components and the complex joining method.