Schaeffler Technologies Ag & Co .kg

David Kehr

William Carter

Henning Karbstein

Peter Sailer

Donald R Haefner

Matthew Evans

Wolfgang Christgen

Jürgen Kretschmer

Chad Lee

The invention relates to a hydraulic support element for valve drive of a combustion engine, with a pot cylindrical casing and a hollow cylindrical piston guided axially movably therein, the inner end of which is supported via a spring on the bottom wall of the casing, whose outer end projects past the outer margin of the casing and is formed as a hemispherical bearing head, and whose inner space is subdivided by means of a partition element into an axially inner supply-pressure space and an axially outer switching-pressure space.

Hydraulic support element

A roller lifter or hydraulic roller lifter, including a lifter body, a roller, axle, internal piston assembly and a lubrication guide depression at a lower wall of the lifter body to direct lubricant to the roller and roller axle.

Roller lifter lubrication guide

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 a pressure piston () of a hydraulic lash adjuster () of said tappet () that follows a periodic driving element such as a cam. A second support () for a follower member () such as 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 (), a one-way valve means () being installed in the tappet pushrod () for retaining a hydraulic medium column during a standstill of the internal combustion engine. In this way, an additional reservoir for hydraulic medium is created that serves for the rapid filling of the pressure piston () immediately after a re-starting of the internal combustion engine.

Valve train of an internal combustion engine comprising a tappet and a tappet pushrod

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.

Growing community of inventors

Oxford, MI, United States of America

David Kehr