Patent ID: 8789504
Filing Date: 2014-07-29
Classification: F01L

Abstract:
1. A camshaft adjuster for a camshaft, comprising a pressure chamber (AB) and an positioning element arranged in the pressure chamber (AB), the positioning element divides the pressure chamber (AB) into a first working chamber (A) and a second working chamber (B), hydraulic medium can be supplied to and discharged from the first working chamber (A) through a first hydraulic medium duct (AA) and supplied to and discharged from the second working chamber (B) through a second hydraulic medium duct (BB), such that the positioning element can be moved, resulting in a rotation of the camshaft, by a pressure difference between the first working chamber (A) and the second working chamber (B), the supply and discharge of the hydraulic medium is controlled by a control device which has a valve housing, a valve sleeve arranged in and rotatable relative to the valve housing, and a control piston axially displaceable within the valve sleeve, the valve housing has orifices which communicate with the first working chamber (A) and the second working chamber (B), the valve housing rotates synchronously with the camshaft and, in the process, the orifices of the valve housing are closed off and opened up by an orifice arrangement formed on the valve sleeve, the orifice arrangement of the valve sleeve communicates with orifices of the control piston as a function of an axial position of the control piston, and the camshaft adjuster has a third hydraulic medium duct (CC) which positions the positioning element in an intermediate position, and the third hydraulic medium duct (CC) has an opening which communicates with one of the working chambers (A, B).