The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 2012
Filed:
Sep. 24, 2009
Jesse Myers, Waterford, MI (US);
Roger Meyer, Brighton, MI (US);
Jesse Myers, Waterford, MI (US);
Roger Meyer, Brighton, MI (US);
Schaeffler Technologies GmbH & Co. KG, Herzogenaurach, DE;
Abstract
A magneto-rheological fluid controlled camshaft phaser is provided having a stator with inwardly directed projections which define working spaces therebetween. The stator is adapted to be connected to the crankshaft via a timing gear and chain. A rotor is located radially inside the stator and is 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 is located in the chambers, and the chambers on each side of each rotor lug are connected via a clearance space between the radially outer surface of the lugs and the inner surface of the stator located between the projections. The rotor is connected to the camshaft. An electromagnetic assembly is mounted adjacent to the stator and includes at least one electromagnet along with at least one ferrous focusing piece. In one embodiment, a plurality of the electromagnets are axially spaced apart from the working chambers holding the magneto-rheological fluid. In another embodiment the electromagnetic is formed by a coil which is radially spaced apart from the working chambers holding the magneto-rheological fluid. In each case, the magnetic field is passed from the electromagnet(s) and the ferrous focusing piece(s) into the phaser via a small air gap spacing between the electromagnet assembly and the moving camshaft phaser.