Device for changing the timing of intake and exhaust valves in an internal combustion engine

Device for changing the timing of intake and exhaust valves in an internal combustion engine of the hydraulic servo-drive type comprising:

• at least one axial fastening bolt (2) for connecting the device (1) to a drive-side end (3) of a camshaft (5) supported in the cylinder head (4) of the internal combustion engine;
• a crankshaft-coupled component (6) driven together with a crankshaft of the internal combustion engine and a camshaft-coupled component (7) rotationally connected with the camshaft (5);
• the camshaft-coupled component (7) is hydraulically rotatable and lockable with respect to the crankshaft-coupled component (6) to effect a relative rotation or a hydraulic clamping of the camshaft (5) with respect to the crankshaft;
• a cylindrical hydraulic-fluid adapter (9,9′) positioned on the device's axial side (8) facing away from the camshaft for supplying and withdrawing hydraulic fluid to and from the device (1) attached to the camshaft-coupled component (7);
• the hydraulic-fluid adapter (9) includes a plurality of hydraulic-fluid lines (10, 11, 12) and is supported in a sleeve bearing (13) in or on the cylinder head (4) of the internal combustion engine, the bearing being part of a hydraulic-fluid circuit and simultaneously acting as a radial bearing of the camshaft (5);
• an impulse-sending wheel (15,15′) for determining the camshaft position with respect to the crankshaft position connected to an end wall (14) of the hydraulic-fluid adapter (9,9′) facing away from the camshaft axially to the camshaft (5);
• a diametrically expanded end flange (16) is connected to the end wall (14) of the hydraulic-fluid adapter (9) facing away from the camshaft which simultaneously forms the impulse-sending wheel (15) of the device (1) and, together with a washer (17) positioned between the hydraulic-fluid adapter (9) and the camshaft coupled component (7) which is diametrically enlarged with respect to the hydraulic-fluid adapter (9), an axial bearing for the camshaft (5).