Camshaft adjuster

Abstract

Camshaft adjuster for an internal combustion engine with a cylinder head, with a drive element and a driven element, the drive element and the driven element can be rotated relative to each other about a common axis, the drive element and the driven element form work chambers acting opposite each other, the work chambers are pressurizable with hydraulic medium, in order to achieve a relative rotation between the drive element and the driven element, and a control valve is arranged in the driven element, the control valve has a valve housing and a control piston that is arranged in the valve housing and is used for controlling the hydraulic medium, the control valve is arranged coaxial to the common axis, and a one-piece radial bearing point constructed by the driven element is provided for support on the cylinder head outside of the axial area of the work chambers.

1 . A camshaft adjuster for an internal combustion engine with a cylinder head, the camshaft adjuster comprising: a drive element and a driven element, the drive element and the driven element are rotatable relative to each other about a common axis, the drive element and the driven element form work chambers acting opposite each other, the work chambers are pressurizable with hydraulic medium, in order to achieve a relative rotation between the drive element and the driven element, and a control valve is arranged in the driven element, the control valve has a valve housing and a control piston that is arranged in the valve housing and is used for controlling the hydraulic medium, the control valve is arranged coaxial to the common axis, and a one-piece radial bearing point constructed by the driven element is provided for support on the cylinder head outside of an axial area of the work chambers. 
     
     
         2 . The camshaft adjuster according to  claim 1 , wherein the control valve is fixed in the axial direction by a positive-fit in the driven element. 
     
     
         3 . The camshaft adjuster according to  claim 1 , wherein the control valve is fixed in the axial direction by a non-positive fit in the driven element. 
     
     
         4 . The camshaft adjuster according to  claim 1 , wherein the driven element has an anti-rotation device for the control valve, so that an installation position defined in a peripheral direction is given. 
     
     
         5 . The camshaft adjuster according to  claim 1 , wherein the valve housing is formed in one piece with the driven element, and the driven element forms a guide surface for guiding the control piston of the control valve. 
     
     
         6 . The camshaft adjuster according to  claim 1 , wherein hydraulic medium is fed into the control valve by hydraulic medium channels formed in the camshaft. 
     
     
         7 . The camshaft adjuster according to  claim 1 , wherein the driven element has a radially projecting peg for attachment to a camshaft. 
     
     
         8 . The camshaft adjuster according to  claim 7 , wherein the peg is formed in one piece with the driven element. 
     
     
         9 . The camshaft adjuster according to  claim 1 , wherein the driven element has a part of an axial bearing and the part of the axial bearing is formed in one piece with the driven element.