Device for the relative rotation of a camshaft relative to a crankshaft that drives the camshaft in an internal combustion engine

Device for the relative rotation of a camshaft relative to a crankshaft which drives the camshaft of an internal combustion engine, wherein:

• the device (1) is attached on a drive-side end (4) of the camshaft (5) which projects into a chain bay (2) of a cylinder head (3) of the engines and comprises a hydraulic adjusting drive,
• the device (1) comprising a structural component (6) that is adapted to be drivingly connected with the crankshaft of the internal combustion engine and a structural component (7) adapted to be connected to the camshaft (5) in a rotationally fixed manner,
• the structural component (6) which is adapted to be drivingly connected to the crankshaft is in force transferring connection with the structural component (7) that is affixed to the camshaft, and can be acted upon alternatingly or simultaneously by a hydraulic pressure agent through two pressure chambers (8, 9) located within the device (1) such that the structural components (6, 7) can be rotated or fixed in position relative to each other,
• the pressure agent supply and return Lo and from the pressure chambers (8, 9) being controlled by a hydraulic control element (12) arranged coaxially to a longitudinal axis of the camshaft in a cavity (10) of an axial structural component (11) of the device (1),
• the hydraulic control clement (12) is activatable through an adjusting element (14) attached to an opposing housing part (13) of the chain bay (2) in a position aligned with an extension of the camshaft longitudinal axis as a function of the operating parameters of the internal combustion engine,
• the hydraulic control element (12) is constructed as a fixed hydraulic part of an adjustable hydraulic valve (15), which is arranged starting from the adjusting element (14) attached to the housing part (13) of the chain bay (2), projecting into the cavity (10) of the axial structural component (11) of the device (1),
• the hydraulic control element (12) has a housing (16) attached to the adjusting element (14) having at least three radial openings (17, 18, 19) distributed circumferentially as well as axially displaced from each other, which arc separated from each other hydraulically by at least four ring-shaped sealing components (20, 21, 22, 23) that enclose the hydraulic control element (12),
• the axial structural component ( 11) of the device (1) has at least three opposing radial bore holes (24, 25, 26) that are distributed over an outer sheath surface of the axial structural component (11) and are also axially displaced from each other, opening into the cavity (10), which are provided for pressure agent supply and return to and from the pressure chambers (8, 9) of the device (1), and
• the sealing components (20, 21, 22, 23) of the hydraulic control element (12) forming together with an inner wall (27) of the cavity (10) of the axial structural component (11), several ring chambers (28, 29, 30), through which every one of the at least three radial bore holes (24, 25, 26) in the axial structural component (11) of the device (1) is each hydraulically connected to one of the at least three radial openings (17, 18, 19) in the hydraulic control element (12).