Patent ID: 6742486
Filing Date: 2004-06-01
Classification: F01L

Abstract:
System for relative angle-of-rotation adjustment of a camshaft of an internal-combustion engine with respect to a driving wheel, having an adjusting unit which has an interior part non-rotatably connected with the camshaft, the adjusting unit having a cell wheel which encloses the interior part and which has several cells distributed along the circumference and bounded by webs, which cells are divided by webs or blades of the interior part angularly movably guided therein into two pressure spaces respectively, during whose hydraulic pressure admission or pressure relief, the camshaft can be rotated by way of the webs or blades between two end positions relative to the cell wheel and that a movable locking element interacts with at least one counterelement in the respective other one of the two componentsâ€”cell wheel or interior part, that the locking element is arranged in a hydraulic line leading to a pressure space and, only in an unlocked position, opens up the hydraulic line to the pressure space, and that bores leading to the pressure spaces are arranged in the interior part, the openings of the bores in the locked end position of the adjusting unit being closed off by the webs of the cell wheel,characterized in that the locking element can be changed into a first unlocking position, in which the bore in the web controlled by the locking element as well as the bores in the interior part leading to the pressure spaces are still closed, and in that the locking element can be changed into a second unlocking position in which first the bore leading to the pressure space is opened up by the locking element and, after an initial adjusting path (&agr;) of the interior part, also the bores leading to the pressure spaces are opened up.