Patent ID: 8096273

Claim:
A magneto-rheological fluid controlled camshaft phaser for controlling a phase angle position of a camshaft, the phaser comprising: a stator with inwardly directed projections which define working spaces therebetween; a rotor located radially inside the stator and is adapted to be connected to the camshaft, rotor lugs extend radially outwardly from the rotor into the working spaces, dividing them into first and second chambers on each side of the rotor lugs; a magneto-rheological fluid located in the chambers, and the chambers on each side of each rotor lug are connected via a clearance space between a radially outer surface of the rotor lugs and an inner surface of the stator located between the projections; and an electromagnetic assembly mounted adjacent to the stator and including at least one electromagnet along with at least one ferrous focusing piece.