Hydraulic camshaft adjuster

A hydraulic camshaft adjuster, comprising

• a stator having a hydraulic chamber;
• a rotor arranged rotatably in the stator, the rotor having at least one blade arranged in the hydraulic chamber of the stator to define a first part chamber that is separated from a second part chamber;
• a central valve configured to control a flow of hydraulic fluid into the first part chamber and into the second part chamber, the central valve including a hydraulic pump connection for receiving hydraulic fluid and a tank connection adapted for discharging hydraulic fluid to a tank;
• a locking system configured to lock the rotor relative to the stator, the locking system comprising first and second control elements which are held in an unlocked position by loading with hydraulic fluid via the central valve, and which bring about a locking action in case of a removal of the loading by the hydraulic fluid, the first control element and the second control element are movable into an operative connection with a slotted guide in the stator or a component connected to the stator, the slotted guide determining an axial position of the control elements;
• wherein the first control element has a first and a second switching position, and in the first, unlocked switching position, a fluidic connection between the hydraulic pump connection and a first one of the two part chambers and a fluidic connection between the other, second part chamber and the tank connection are established, and in the second, locked switching position, a fluidic connection between the hydraulic pump connection and the second one of the two part chambers and a fluidic connection between the other, first part chamber and the tank connection are established, and
• wherein the second control element is free from different switching positions and does not influence the flow of hydraulic fluid.