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:
Aug. 04, 2009
Filed:
Oct. 12, 2005
Volker Schmidt, Burgbernheim, DE;
Volker Schmidt, Burgbernheim, DE;
Schaeffler KG, Herzogenaurach, DE;
Abstract
A variable valve drive () of an internal combustion engine is provided which is used to actuate a gas exchange valve (). Displacement thereof takes place via a cam () generated lift and via a lift generated by a piston () of a hydraulic force applying device (), which is superimposed on the cam lift and which is independent thereof. The hydraulic force applying device is connected to a hydraulic fluid line (S-P) which provides an adjustable hydraulic pressure medium and includes a pressure chamber () which is limited on one side by the piston (), in addition to a hydraulic valve lash compensation device () which includes a working chamber () which is radially defined by a housing (). The housing () is also used to radially define the pressure chamber ().