Schaeffler Technologies Ag & Co .kg

Matthias Becker

Robert Heinemann

Wolfgang Christgen

Volker Schmidt

A variable valve train () of a combustion engine for applying a load on two equally acting gas exchange valves () for each cylinder of the combustion engine is provided, including a switchable valve train element () with an outer part and an inner part ((), ()) that can move relative to each other allocated to each of the two gas exchange valves (). The outer and inner parts ((), ()) are selectively connectable to each other by an associated coupling slide mechanism (). The valve train () further includes a control shaft (), on which a control cam () is applied for each coupling slide mechanism (), and the control cams contact an outer end face () of the respective coupling slide mechanisms () for displacement thereof in one direction, and the two control cams () can rotate separately from each other on the common control shaft ().

Variable valve train of a combustion engine

A switchable lever for a valve drive of an internal combustion engine, which has an elongated housing with two side walls. A crossbar for a gas-exchange valve system and another end of the housing has a hearing for pivotable support of the crossbar. An axle is held nondisplaceably in the side walls. An axially fixed low-lift cam roller is seated centrally on the axle and is flanked on both sides by a high-lift cam roller. The high-lift cam rollers are displaceable: (a) into a first position, away from each other, to toward the side walls such that contact of one high-lift cam per high-lift cam roller is possible, and (b) into a second position, toward each other, such that they are located outside an engagement region of the high-lift cams, and as a result of which contact of a low-lift or zero-lift cam with the low-lift cam roller is possible.

Switchable lever for a valve drive of an internal combustion engine

An anti-rotation device () for a coupling piston () in a switchable component () of a valve train of an internal combustion engine is provided, with the component () including two parts () that are movable relative to each other. The coupling piston () is displaced into a bore () of one of the two parts () for achieving uncoupling, and the coupling piston () comprising, at least on one side (), a flattened portion () starting from a front end () of the coupling piston () facing another one of the two parts (), through which flattened portion (), during a relative movement of the two parts (), the coupling piston () is displaced onto an entraining surface () arranged on the another one of the two parts () for achieving coupling, the anti-rotation device () being configured as a fractional region of an opening () of the bore () on a bridge component spanning the one part (), and the coupling piston () being guided through its flattened portion () on a bowstring-like transverse surface () of the bridge component.

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Herzogenaurach, Germany

Matthias Becker