Abstract: At least one locking device between an interior part and cellular wheel, which is equipped with a movable locking element that acts together with at least one counter-element in a respectively other component of the two components cellular wheel or interior part, causes the interior part to be able to be locked relative to the cellular wheel in at least one final position. The locking and/or unlocking process of the locking element occurs through at least one oil duct that leads to the locking element. Between two pressure chambers in or on the cellular wheel an opening connected with the oil duct is arranged, whose passage to the two pressure chambers is controlled in dependence on the adjusting position of the interior part. This way, the cam shaft adjusting unit can be locked safely.

Abstract: An arrangement for the relative angle-of-rotation adjustment of a camshaft with respect to a driving wheel has an interior part which is non-rotatably connected with the camshaft. A driven cell wheel has several cells which are distributed along the circumference and are bounded by webs and can be divided into two pressure spaces by the webs or blades guided therein in an angularly movable manner. At least one locking device, which is operative between the interior part and the cell wheel, can lock the interior part with respect to the cell wheel in at least one end position. At least one blade of the interior part has a head part having at least one locking element which interacts with a locking structure provided on at least one web of the cell wheel.