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:
Feb. 22, 2005
Filed:
Jun. 25, 2002
Udo Diehl, Stuttgart, DE;
Karsten Mischker, Leonberg, DE;
Bernd Rosenau, Tamm, DE;
Uwe Hammer, Hemmingen, DE;
Stefan Reimer, Markgroeningen, DE;
Volker Beuche, Stuttgart, DE;
Peter Lang, Weissach, DE;
Udo Diehl, Stuttgart, DE;
Karsten Mischker, Leonberg, DE;
Bernd Rosenau, Tamm, DE;
Uwe Hammer, Hemmingen, DE;
Stefan Reimer, Markgroeningen, DE;
Volker Beuche, Stuttgart, DE;
Peter Lang, Weissach, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
An hydraulically controlled actuator for activating a valve, especially for activating a gas-exchange valve in a combustion cylinder of an internal combustion engine, which includes two fluid-filled pressure chambers having controllable chamber volumes and a movable operating piston which delimits the pressure chambers by piston sides facing away from one another, the operating piston acting upon the valve and having an effective closing area acted upon by fluid pressure in the pressure chambers to close the valve and an effective opening area acted upon by the fluid pressure to open the valve. To influence the kinematics of the opening and closing movement of the valve, the operating piston is such that the surface area of at least one of the two effective areas changes along the sliding path of the operating piston.