Camshaft adjusting device

The invention relates to a camshaft adjusting device comprising a vane cell adjuster with a stator (16) which can be connected to a crankshaft of an internal combustion engine and with a rotor (17) which is rotatably mounted in the stator (16) and can be connected to a camshaft. Multiple webs are provided on the stator (16), said webs dividing an annular space between the stator (16) and the rotor (17) into a plurality of pressure chambers (29, 30, 31). The rotor (17) has a rotor hub (36) and a plurality of vanes (11, 12, 13) extending outwards radially from the rotor hub (36), said vanes dividing the pressure chambers (29, 30, 31) into two groups of working chambers (24, 25, 26, 27, 28, 32), each of which can be supplied with a pressure medium flowing into or out of a pressure medium circuit and which have different working directions. The camshaft adjusting device also comprises a central locking device (32) for locking the rotor (17) in a central locking position relative to the stator (16). In one or more of the vanes (11, 12, 13) together: at least two pressure medium lines (34, 35) are provided, each of which fluidically connects two working chambers (24, 25, 26, 27, 28, 32) with different working directions to each other. Non-return valves (9, 10) with different working directions are provided in each pressure medium line (34, 35), each non-return valve allowing a flow of the pressure medium between the working chambers (24, 25, 26, 27, 28, 32) in one direction and preventing the flow in the respective other direction depending on the rotational direction of the rotor (17) relative to the stator (16). A first switchable valve device is provided in the respective other vanes (11, 12, 13) which are not provided with non-return valves (9, 10), said valve device allowing a flow of the pressure medium between the working chambers (24, 25, 26, 27, 28, 32) with different working directions in one switch position.