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:
Apr. 29, 2014
Filed:
Jul. 07, 2011
Frank Richter, Oberteuringen, DE;
Reiner Keller, Bodman-Ludwigshafen, DE;
Markus Wannags, Eriskirch, DE;
Ilja Imgrunt, Friedrichshafen, DE;
Frank Richter, Oberteuringen, DE;
Reiner Keller, Bodman-Ludwigshafen, DE;
Markus Wannags, Eriskirch, DE;
Ilja Imgrunt, Friedrichshafen, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A valve train of a combustion piston engine having an actuating device which comprises a phase shift gearbox with two inputs and an output for phase adjustment of a camshaft. The first input is connected with a crankshaft, the second input is connected with a controllable braking device and the output is rotationally fixed with the camshaft. The brake is an electromagnetically controlled friction brake which comprises an electromagnet and magnetic coil. A brake rotor is connected with the second input and can be biased, by the magnetic field of the electromagnet, against a friction surface. A permanent magnet is positioned axially adjacent the brake rotor such that, by its magnetic field, the brake rotor can be pressed against a fixed friction surface for the adjustment of a basic brake torque with the respective basic pressing force.