housing 15 is connected to the driving wheel 3 by an annular surrounding weld connection 15 a furthermore a connecting link 16 in which an element 16 a for limiting the rotational angle engages is formed on the driving wheel 3 for the purpose of sealing the compression chambers 13 14 a sealing disk 17 which is adapted to the diameter of the stator 4 is inserted between the housing 15 and stator 4 in addition a locking element 19 is arranged within the driven part 6 in an axial bore hole 18 a spring element 20 here applies a force on a piston 21 in the direction of the driving wheel 3 especially during the startup process of the internal combustion engine the piston 21 is pressed into a recess 22 of the driving wheel 3 by the spring element 20 whereby undesired rotation of the driven part 6 relative to the driving wheel 3 is effectively prevented during the operation of the internal combustion engine the recess 22 is charged with hydraulic medium whereby a force directed in the axial direction against the spring element 20 acts on the piston 21 therefore the piston 21 is displaced into the axial bore hole 18 whereby the driven part 6 can rotate relative to the driving wheel 3 the stator 4 the sealing disk 17 and also the housing 15 are components manufactured using a non cutting method from a sheet metal part naturally the invention can also be used in other variants of rotary piston adjusters for.