Camshaft adjuster with locking device

A camshaft adjuster for an internal combustion engine, comprising:

• a drive part drive-connected to a crankshaft;
• an output part which is concentric to the drive part and is connected fixedly in terms of rotation to a camshaft and which is arranged rotationally adjustably with respect to the drive part and of which a relative rotary position with respect to the drive part can be adjusted between two rotary end positions by means of an actuating mechanism, and
• a locking device, by means of which the drive part and the output part can be locked fixedly in terms of rotation in a rotary locking position,
• wherein the locking device has four engagement pairs which in each case comprise an axial locking bolt received in the drive part or the output part and a locking slot formed in the corresponding other part, the engagement pairs being designed such that, in an event of a relative rotary position between a rotary end position trailing in a drive direction and the rotary locking position, the locking bolts can be brought into successive engagement with the locking slots during an adjustment of the output part in the drive direction, each successive engagement of the locking bolts and the locking slots inhibiting adjustment of the output part opposite to the drive direction and allowing adjustment in the drive direction until the rotary locking position is reached, and
• wherein each of the locking slots has a dimension in a circumferential direction that is greater than a dimension in the circumferential direction of other of the locking slots that are successively engaged thereafter, and a first of the four engagement pairs through a last of the four engagement pairs are arranged on the camshaft adjuster in circumferential succession in order of successive engagement.