Locking unit for a device for modifying the timing of charge change valves in internal combustion engines, especially for a vane-cell control device

Abstract

The invention relates to a locking unit for a device for modifying the timing of charge change valves of an internal combustion engine, especially for a vane-cell control device. Said device (,) comprises a drive wheel (,) presenting a hollow space (,) and connected to a crankshaft of the internal combustion engine in a driving manner. The device also comprises an impeller (,) which has at least one vane (,) and is connected to the camshaft (,) in a non-rotating manner. At least one working chamber (,), which is divided by a vane (,) into two hydraulic pressure chambers (,), is formed by intermediate walls (,) in the hollow space (,) of the drive wheel (,). When the pressure chambers (,) are subjected to pressure by means of a hydraulic pressure medium they cause the impeller (,) to pivot in relation to the drive wheel (,). When there is no pressure in one of the two pressure chambers (,) the impeller (,) and the drive wheel (,) are mechanically coupled to each other. According to the invention the mechanical coupling between the impeller (,) and the drive wheel (,) of the device (,) can be achieved by means of at least one radially movable vane (,) of the impeller (,) which is configured as both an impeller pivoting element and a locking element.