torques the oppositely acting torques are suppressed by means of the completely closed orifices 41 and 43 such that no reverse adjustment takes place fig1 illustrates how the throughflow of pressure medium at the respective inner and outer edges pa pb bt at changes as a function of the switching position here dashed lines illustrate profiles at times with a camshaft torque in the advance direction and solid lines illustrate profiles at times with camshaft torques in the retardation direction the line for the inner edge of the first cover part 51 a pb will be explained by way of example in the case of camshaft torques in the retardation direction the throughflow at the inner edge pb is high in all axial positions whereas in the case of torques in the advance direction from switching position i to switching position ii and subsequent switching positions said throughflow falls quickly to zero fig1 schematically shows for switching positions i v the degree of opening of the orifices 41 43 as viewed from the respective inner edges pb pa and outer edges bt at as a function of the switching positions i v and the adjusting direction fully hatched fields correspond to a completely blocked orifice 41 43 fully white fields correspond to.