Schaeffler Technologies Ag & Co .kg

Michael Berger

Calin Petru Itoafa

Volker Schmidt

Thomas Kremer

Andreas Kufner

An electrohydraulic valve controller for variable actuation of a gas exchange valve of an internal combustion engine. The electrohydraulic valve controller has a first hydraulic valve and, for the purpose of providing an emergency running capability, a second hydraulic valve.

Electrohydraulic valve controller

An internal combustion engine with a bottom camshaft () and an electrohydraulic variable-lift valve actuation of a modular construction type is provided. The hydraulic unit () is assembled separately from the internal combustion engine and installed in or on the crankcase ().

Internal combustion engine with variable-lift electrohydraulic valve actuation

A valve drive () of an internal combustion engine which is used to actuate a gas exchange valve () is provided. Displacement of the valve takes place when a cam () is lifted and when a hydraulic force applying device () is lifted. A piston () of the force applying device can be displaced from a first end position (A) to a second end position by feeding a hydraulic medium, which can be pressure-adjusted, from a hydraulic medium line () into a pressure chamber (). The pressure chamber () can be connected to the hydraulic medium line () via a shut-off element () which is open towards the pressure chamber () and which is arranged in the housing () and also by means of at least one passage () in the housing (). The passage () is at least partially blocked by an external casing surface () of the piston () in the first end position (A) thereof.

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Berching, Germany

Michael Berger