Patent ID: 6363897
Filing Date: 2002-04-02
Classification: F01L,F16D,Y10T

Abstract:
A device for changing the control timing of gas exchange valves of an internal combustion engine, comprising:a drive gear (2) adapted for direct connection to a crankshaft of the internal combustion engine and an impeller (3) adapted for direct connection to a camshaft of the internal combustion engine, the drive gear (2) has a cavity (7) formed by a hollow cylindrical perimeter wall (4) and two side walls (5, 6) inside of which at least one hydraulic working chamber (9) is formed by at least two boundary walls (8), the impeller (3) has a wheel hub (10) with at least one vane (11) at a perimeter thereof that extends radially into the working chamber (9) of the drive gear (2) that divides the working chamber (9) into two respective hydraulic pressure chambers (12, 13) that counteract one another, the pressure chambers (12, 13) are adapted to effect a pivoting motion or a fixing of the impeller (3) with respect to the drive gear (2), and thus of the camshaft with respect to the crankshaft, by selective or simultaneous application of pressure through a hydraulic pressure medium feed, a pressure medium tap (16) lying at the axial side (14 or 15) of the wheel hub (10) of the impeller (3) facing toward or away from the camshaft, and pressure medium channels (17, 18) located in both axial sides (14, 15) of the wheel hub (10) of the impeller (3) that form the pressure medium feed to and from the pressure chambers (12, 13), the pressure medium tap (16) and the pressure medium channels (17, 18) are connected to one another through a pressure medium distributor (20) penetrating the impeller (3) along a longitudinal axis thereof and lying by means of a head (19) against the axial side (15 or 14) of the wheel hub (10) of the impeller (3) facing away from or toward the camshaft, the pressure medium tap (16) and the pressure medium distributor (20) are adapted to be connected directly to the camshaft and are partially enclosed at the head (19) and an outer surface (21) of the pressure medium tap by a respective coaxial penetration (22, 23) in the side walls (5, 6) of the drive gear (2), wherein,wear-resistant sealing media are used to seal a gap located between the head (19) of the pressure medium distributor (20) and the penetration (22) of the one side wall (5) of the drive gear (2) and between the outer surface (21) of the pressure medium tap (16) and the penetration (23) of the other side wall (6) of the drive gear (2) against external pressure medium leakage.