Camshaft adjusting device

The present invention relates to a camshaft adjusting device having: - a vane cell adjuster with - a stator (16) that can be connected to a crankshaft of an internal combustion engine and - a rotor (17) rotatably mounted in the stator (16) that can be connected to a camshaft, and - a centre locking device (26) for locking the rotor (17) in a centre locking position relative to the stator (16), wherein - the centre locking device (26) has at least two spring-loaded locking pins (2, 5) which can be locked in a locking slotted guide (19) stationary in relation to the stator and lock in the locking slotted guide (19) from different directions in case of a rotation of the rotor (17) from the direction of an "early" or "late" stop position into the centre position, wherein - on at least one first locking pin (2, 5), a locking portion (31/32) and a pressure medium line (13, 14) through which there can be a free flow are provided, via which a fluidic connection between two working chambers (20, 21, 22, 23) having different directions of action can be produced or blocked in the different positions of the first locking pin (2), and - the working chambers (20, 21, 22, 23) having different directions of action can be short-circuited by means of a switching device, and - in at least one pressure medium line (8, 29), which can be connected in terms of flow to the pressure medium circuit by means of the pressure medium line (13, 14) of the locking pin (2, 5) through which there can be a free flow, a check valve (9;10) is provided, which allows a flow of the pressure medium into one of the working chambers (20, 21, 22, 23), the volume of which can be enlarged in case of a rotation of the rotor (17) from the direction of one of the stop positions "early" or "late" in the direction of the centre locking position, and which check valve simultaneously prevents a back-flow from the same working chamber (20, 21, 22, 23).