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 (1) comprises a drive wheel (3) presenting a hollow space (8) and connected to a crankshaft of the internal combustion engine in a driving manner. The device also comprises an impeller (9) which has at least one vane (13) and is connected to the camshaft (2) in a non-rotating manner. At least one working chamber (20), which is divided by a vane (13) into two hydraulic pressure chambers (21, 22), is formed by intermediate walls (16) in the hollow space (8) of the drive wheel (3). When the pressure chambers (21, 22) are subjected to pressure by means of a hydraulic pressure medium they cause the impeller (9) to pivot in relation to the drive wheel (3). When there is no pressure in one of the two pressure chambers (21, 22) the impeller (9) and the drive wheel (3) are mechanically coupled to each other.

Abstract: A vane-type camshaft adjusting device for an internal combustion engine, with a drive pinion (2) connected in driving relationship to a crankshaft, and a winged wheel (7) connected rotationally fast to a camshaft. The drive pinion (2) a hollow space (6) which is defined by a circumferential wall (3) and two side walls (4, 5), into which hollow space (6) is inserted the winged wheel (7) having at least two wings (9) on its wheel hub (8). Limiting walls (10) define at least two working chambers (14) in the hollow space (6) of the drive pinion (2), and each of these working chambers (14) is divided into two hydraulic pressure chambers (18, 19) by one of the wings (9) of the winged wheel (7). The limiting walls (10) of the drive pinion (2) are in sealing contact by axial sealing strips (13) with the wheel hub (8) of the winged wheel (7), while the wings (9) of the winged wheel (7) are in sealing contact by axial sealing strips (17) with the circumferential wall (3) of the drive pinion (2).