Device for varying timing of gas exchange valves of internal combustion engines, particularly a vane-type camshaft adjusting device

A device for varying valve timing of gas exchange valves of an internal combustion engine, particularly a vane-type camshaft adjusting device comprising:

• a drive pinion configured as an outer rotor and connected in driving relationship to a crankshaft of the internal combustion engine by a traction means, said drive pinion having a hollow space defined by a circumferential wall and two side walls,
• a winged wheel configured as an inner rotor and connected rotationally fast to a camshaft of the internal combustion engine, which winged wheel is inserted into the hollow space of the drive pinion and has a wheel hub on whose periphery are radially arranged at least two wings,
• at least two working chambers defined within the hollow space of the drive pinion by limiting walls extending from an inner surface of the circumferential wall towards a central longitudinal axis of the drive pinion, radial end faces of the limiting walls being in sealing contact with the wheel hub of the winged wheel by sealing strips arranged in axial retaining grooves, each working chamber being divided into two hydraulic pressure chambers by one of the wings of the winged wheel, radial end faces of the wings being in sealing contact in each working chamber with the inner surface of circumferential wall by sealing strips likewise arranged in axial retaining grooves,
• a turning and/or fixing of the winged wheel relative to the drive pinion, and thus a relative rotation and/or a continuous hydraulic clamping of the camshaft relative to the crankshaft is obtained by an optional successive or simultaneous pressurizing of the pressure chambers by a hydraulic pressure medium,
• wherein the sealing strips on the radial end faces of the limiting walls of the drive pinion and/or the sealing strips on the radial end faces of the wings of the winged wheels are joined to each other by radial and coaxial struts on axial end surfaces of the drive pinion and/or on axial end surfaces of the winged wheel to form a one-piece or a multi-piece sealing cage which enables a sealing of the hydraulic pressure chambers in the hollow space of the drive pinion from one another both radially on the circumferential wall of the drive pinion and/or on the wheel hub of the winged wheel, as also axially on the side walls of the drive pinion, the sealing cage further enabling a compensation of axial manufacturing tolerances between the drive pinion and the winged wheel of the device.