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:
Mar. 23, 1999
Filed:
Apr. 10, 1998
Peter Giese, Herzogenaurach, DE;
INA Walzlager Schaeffler OHG, Herzogenaurach, DE;
Abstract
An electromagnetic drive mechanism (1) for the periodic movement of at least one valve (2) for gas exchange of an internal combustion engine is provided. The valve (2) includes a disc-type rotor (9) located at an end (8) of its shaft (5). The rotor (9) is surrounded by a stator (12), a small gap (22) located between the rotor and the stator. The rotor (9) and stator (12) have ring windings (10, 13). When the stator (12) is supplies with electric voltage from a voltage converter (13a) with a microprocessor (14), the rotor (9) with the valve (2) is moved axially by the magnetic field which forms. The drive mechanism (1) operates selectively as a synchronous motor, reluctance motor, or asynchronous motor, and is provided with mechanisms (21) for current regeneration so that after the electric drive mechanism (1) is turned off immediately before reaching an excursion limit of the valve (2), the electric power gained in this way can be stored intermediately and supplied for the next lifting travel to the drive mechanism (1).