Schaeffler Technologies Ag & Co .kg

Thomas Kremer

Michael Haas

Calin Petru Itoafa

Mario Kuhl

Martin Rauch

Lothar Von Schimonsky

Robert Goraj

Andreas Eichenberg

Henning Karbstein

Nicola Morelli

Michael Berger

Jens Lang

Sandra Schafer

Sandra SCHÄFER

An actuator for an electrohydraulic gas exchange valve train of a combustion engine is provided. The actuator has an actuator housing which can be mounted on the combustion engine with a borehole, a hydraulic piston, which is mounted therein such that it can carry out a reciprocating movement, for actuating the gas exchange valve and an axial stop which, when the actuator housing is in the unmounted state relative to the combustion engine, limits the piston stroke out of the borehole to a mounting stroke (T). This mounting stroke is smaller than a maximum operating stroke (L) with which the hydraulic piston actuates the gas exchange valve, the piston stroke being only temporarily limited to the mounting stroke by the axial stop and no longer being limited to the mounting stroke once the actuator is in operation.

Actuator for an electrohydraulic gas-exchange valve train of a combustion engine

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 hydraulic unit () is provided for a cylinder head () of an internal combustion engine with a hydraulically variable valve train (). In the hydraulic unit, a high-pressure chamber (), a medium-pressure chamber (), and a low-pressure chamber () used as the hydraulic medium reservoir are formed. The low-pressure chamber communicates via a throttle point ('&#x2033;) with the medium-pressure chamber, and the throttle point is formed by a displaceable valve body (&#x2032;&#x2033;) and has through-flow cross sections of different sizes according to a position of the valve body.

Hydraulic unit for a cylinder head of an internal combustion engine with hydraulically variable gas-exchange valve train

Valve controller for reciprocating piston internal combustion engines with at least two intake and/or exhaust gas-exchange valves for each piston/cylinder unit, wherein the gas-exchange valves are guided by valve stems in a cylinder head () of the reciprocating piston internal combustion engine, loaded in a closing direction by valve springs, and can be controlled via a common bridge () by an activation device, wherein the bridge () is guided over a sliding surface parallel to the movement of the gas-exchange valves, the bridge () has at least one hydraulic valve clearance compensation element (or) that connects to a gas-exchange valve, and a device is provided that prevents rotation of the bridge () about the sliding surface.

Valve control for reciprocating piston internal combustion engine

An electrohydraulic control module is provided for making available a compressed fluid, especially compressed oil for actuators, which are used for actuating control units, for example, for switching gas-exchange valves of an internal combustion engine on and off, with a control housing, which is attached to a connection part of the internal combustion engine and which has electrical switching valves that are connected to an oil supply line and to control oil lines leading to the actuators. The production and assembly expense of the electrohydraulic control modules is reduced in that an intermediate housing (), which is injection molded from plastic and which has at least the oil supply line and the control oil lines (), is clamped between the connection part () and the control housing ().

Electrohydraulic control module

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Furth, Germany

Thomas Kremer