Patent ID: 6799544
Filing Date: 2004-10-05
Classification: F01L

Abstract:
A camshaft phaser system for controllably varying the timing of an engine valve actuable by a camshaft in an internal combustion engine, the phaser timing being controllably varied by cyclic torque oscillation of the camshaft, comprising:a) a camshaft phaser having a stator and a rotor and at least one advance chamber and at least one retard chamber disposed therebetween; b) check valve means in said phaser for controlling communication of a hydraulic fluid in first and second opposing directions between said advance chamber and said retard chamber; c) a piston means for controllably opening and closing said check valve means; and d) a solenoid means associated with said piston means for actuating said piston means, wherein said solenoid means comprises an armature, windings, and a pole piece, and wherein said armature is rotatable with said phaser and said windings and pole piece are non-rotatably fixed adjacent said armature.