Patent ID: 6382154
Filing Date: 2002-05-07
Classification: F01L

Abstract:
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 (9,9â€²) 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 (15,15â€²) for determining the camshaft position with respect to the crankshaft position connected to an end wall (14) of the hydraulic-fluid adapter (9,9â€²) 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).