Patent ID: 7011059
Filing Date: 2006-03-14
Classification: F01L

Abstract:
1. A camshaft adjuster for adjusting the relative angular positions of a camshaft drive and a camshaft ( 11 ) of an internal combustion engine, said camshaft adjuster comprising a 4/2 way valve ( 17 , 18 ) mounted co-axially on the camshaft ( 11 ) for rotation therewith and including a hydraulic control piston ( 18 ) movably disposed in a control cylinder ( 17 ) so as to be movable between two end stops ( 26 , 35 ) in the control cylinder ( 17 ), a compression spring ( 24 ) disposed in the control cylinder so as to bias the control piston toward the end stop ( 26 ) remote from the camshaft ( 11 ), a control casing ( 29 ) disposed axially adjacent the control piston ( 18 ) opposite the camshaft ( 11 ), an electromagnet ( 28 ) in the form of a repelling proportional magnet disposed in the control casing ( 29 ) and having an armature plunger ( 34 ) with a magnet armature ( 33 ) for actuating the plunger ( 34 ) for engaging the control piston ( 18 ) and moving it against the force of the compression spring ( 24 ), the armature plunger ( 34 ) of the electromagnet ( 28 ) having an operating stroke exceeding that of the control piston ( 18 ).