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. 03, 2006
Filed:
Apr. 12, 2005
Jens Schäfer, Herzogenaurach, DE;
Martin Steigerwald, Erlangen, DE;
Jon Heywood, Pettstadt, DE;
INA-Schaeffler KG, Herzogenaurach, DE;
Abstract
A device for electrically adjusting the relative rotation of two shafts, particularly a camshaft () in relation to a crankshaft of an internal combustion engine is provided. The adjusting device includes an adjusting gear system which is embodied as a triple-shaft gear mechanism and is provided with a crankshaft-fixed input part, a camshaft-fixed output part, and an adjusting shaft () that is connected in a torsion-proof manner to an electric adjusting motor shaft () of an electric adjusting motor (). The adjusting motor () is configured as a brushless DC motor having a housing-fixed stator () and a permanent magnet rotor (). A high degree of adjustment accuracy and adjustment speed are provided with minimal space requirements and low power consumption. This is achieved through the use of a double eccentric gear mechanism () and a double planetary gear mechanism, which are provided with a speed reduction of up to about 1:250 and low friction, as an adjusting gear system while using a highly inductive permanent magnet rotor for the adjusting motor ().