Avl List Gmbh

Iwis Motorsysteme Gmbh & Co. Kg

Siegfried Lösch

Malte Heller

Bernhard Kometter

Martin Bodensteiner

Kai Arens

Klaus Landfahrer

Steffen Latz

Zoltán Riba

Wilhelm Greylinger

Christian Gallob

Gerhard Heimel

Stefanie Bezner

Johann Felgitscher

Robert St John

Martin Rath

Heinrich Fürhapter

Alois Fürhapter

Uwe Dieter Grebe

The invention relates to an adjustable-length connecting rod for a reciprocating piston engine, to a reciprocating piston engine, and to a vehicle, where an effective connecting rod length of the connecting rod can be changed, and the connecting rod has a hydraulic length adjustment device which has a hydraulic working chamber, a hydraulic duct, a valve recess with a valve recess longitudinal axis, and a valve device which is arranged in the valve recess and has a valve chamber, where the valve device is configured for opening and/or shutting of a hydraulic medium outflow from the hydraulic working chamber, and the hydraulic duct opens into the valve recess at an orifice opening in an inner wall section of the valve recess. The valve device has at least one closed outer wall section which lies opposite the orifice opening and surrounds the valve chamber of the valve device, where the outer wall section of closed configuration of the valve device configures a flow duct together with that inner wall section of the valve recess, where the flow duct is configured to divert hydraulic medium, which exits from the hydraulic duct with a first flow direction and enters into the valve recess, in a second flow direction which is different from the first flow direction before the entry into the valve chamber.

Adjustable-length connecting rod, reciprocating piston engine, and vehicle

A length-adjustable connecting rod for an internal combustion engine, where the connecting rod includes at least one switchable outlet valve for opening and closing a pressure chamber, where the outlet valve comprises a valve body and a closing body that is operatively connected to the valve body, and a closing mechanism is present acting upon the closing body for directly moving the closing body and indirectly moving the valve body from a closed to an open position or vice versa. Such an outlet valve is to be configured to be operable. For this purpose, this closing body has a mass which is smaller than the volume defined by the envelope contour of the closing body multiplied by the density of steel (7.85 g/mm). The use of such a closing body for a respective length-adjustable connecting rod is also provided.

Length-adjustable connecting rod with reduced-mass outlet valve

The invention relates to a method for operating a reciprocating piston machine, particularly an internal combustion engine, having at least one piston rod that is hydraulically adjustable in length for setting a compression ratio, wherein the piston rod comprises a piston and a hydraulic cylinder for adjusting its length, wherein the piston with the hydraulic cylinder delimits at least one working chamber, through the fill level of which at least two switching positions of the piston rod are possible, wherein independently from the setting of the compression ratio the working chamber is at least partially filled and emptied as a function of at least one first predetermined requirement to effect an at least partial exchange of a hydraulic medium in the at least one working chamber.

Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length

An assembly method for joining a telescopic rod part of a length-adjustable connecting rod, the method includes the following steps: providing a first section of the telescopic rod part, the first section comprising a connecting-rod eye and having a connection thread, providing a second section of the telescopic rod part, the second section comprising the piston rod, to which a piston is fixedly connected, and having a connection thread, wherein the second section has already arranged thereon at least sealing and/or supporting and/or closing elements, which are to be secured to the second section and which are to be mounted onto the piston rod and the piston, respectively, from the side of the associated connection thread, providing a tool for establishing a sufficiently strong frictional engagement with the piston rod and the piston, respectively, by means of form-fit clamping, establishing a sufficiently strong frictional engagement with the second section of the telescopic rod part by means of the tool, screw fastening the first section of the telescopic rod part to the second section of the telescopic rod part by means of the respective connection threads, applying the necessary tightening torque between the first section of the telescopic rod part and the second section of the telescopic rod part by means of the attached tool. In addition, the present invention relates to the use of a telescopic rod part of a VCR connecting rod in such a method.

Assembly method for joining the telescopic rod part of a VCR connecting rod

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Graz, Austria

Siegfried Lösch