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. 12, 2008
Filed:
Mar. 08, 2006
Oliver Schnell, Veitsbronn, DE;
Christian Schaefer, Nuremberg, DE;
Peter Sailer, Erlangen, DE;
Schaeffler KG, Herzogenaurach, DE;
Abstract
A hydraulic valve play compensation element for an internal combustion engine is provided as a reverse-spring/free-ball element, with a cylindrical housing, a cylindrical piston () guided therein with sealing play and a control valve (), which is arranged between a low-pressure chamber () of the piston () and a high-pressure chamber () of the housing, on a piston head () of the piston and which has a closing body (), which can contact a valve seat () surrounding an axial bore hole () of the piston head () when carrying out a stroke () in the closing direction against the force of a control-valve spring () and which can contact a contact surface () of a valve cap () surrounding the closing body () when carrying out a stroke in the opening direction. In a region of the axial bore hole () for the closing body () there is a narrow guidance surface () with gaps, which enable a volume flow of hydraulic medium between the high-pressure chamber () and the low-pressure chamber ().