Patent ID: 6666179
Filing Date: 2003-12-23
Classification: F01L

Abstract:
A camshaft for operation of valves of an internal-combustion engine, comprising:a device for hydraulic adjustment of a relative rotating position of the camshaft for influencing a timing of the valves, said device having a drive wheel for the camshaft, a cell wheel, and an impeller which, by way of radial vanes, is disposed within cells of the cell wheel and is able to carry out a relative motion, a locking arrangement, which is operative in a starting phase of the internal-combustion engine, provided between the cell wheel and the impeller, said locking arrangement being formed by an axially spring-loaded, hydraulically operated piston which is accommodated in one of the vanes of the impeller and a corresponding receiving device for the piston which is provided in a constructional unit consisting of the drive wheel and the cell wheel, the piston having a locking section which projects into the receiving device and being guided in the one of the vanes of the device, and an operating element with which the piston cooperates, the piston being acted upon by a first pressure space and the operating element being acted upon by a second pressure space to move the locking section out of the receiving device after a starting phase of the internal combustion engine.