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:
May. 03, 2005
Filed:
Mar. 16, 2002
Diogenes Perez Cuadro, Korntal-Münchingen, DE;
Diogenes Perez Cuadro, Korntal-Münchingen, DE;
Mahle Ventiltrieb GmbH, Stuttgart, DE;
Abstract
The invention relates to a hydraulic actuator for actuating a gas exchange valve () of an internal combustion engine, which valve is especially closed by the effect of a spring. The actuator is configured by a feed pump () with intermittent and thus variable delivery. The feed pump () has a high frequency and can be equipped for this purpose with piezoelectric, magnetorestrictive and/or electrochemical actuators as the feed elements. Optionally, the feed pump () can be operated with a stop valve () that is disposed downstream of the gas exchange valve () and that is controlled or regulated depending on the feed pump.