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:
Jul. 24, 2007
Filed:
Dec. 15, 2005
Henning Karbstein, Adelsdorf, DE;
William Carter, Macomb, MI (US);
David Kehr, Dearborn, MI (US);
Schaeffler KG, Herzogenaurach, DE;
Abstract
The invention proposes a valve train of an internal combustion engine comprising a tappet () and a tappet pushrod () that is actuated by said tappet (), said tappet pushrod () being at least partly hollow and comprising on one end (), a first support () for an at least indirectly contacting pressure piston () of a hydraulic lash adjuster () of said tappet () that follows a periodic driving element, typically a cam. A second support () for a follower member (), typically a rocker arm, is arranged on a further end () of the tappet pushrod (). The first support () comprises a passage () for hydraulic medium that can be routed out of the pressure piston () during operation of the internal combustion engine into an interior () of the tappet pushrod (), wherein a pipette means () is installed in the tappet pushrod () for retaining a hydraulic medium column during a standstill of the internal combustion engine. Through the pipette means () of the invention, an additional volume of hydraulic medium is available for a rapid filling of the reservoir enclosed by the pressure piston () with pressure medium after a re-starting of the internal combustion engine, so that a proper lash adjusting operation is guaranteed from the very beginning.