Avl List Gmbh

Stefan Lichtenegger

Helmut Melde-Tuczai

Bernhard Hoedl

Konstantin Erjawetz

Gerhard Heimel

Muammer Yolga

A length-adjustable connecting rod has a first rod part and a second rod part, with the rod parts being displaceable telescopically toward and/or in one another by means of a length-adjusting means, and with the length-adjusting means being chargeable via a hydraulic channel with a hydraulic medium. The hydraulic channel is fluidly connectable by means of a control device to a hydraulic medium supply channel. The control device has a first and a second valve, each with a valve chamber and each with a valve body that can be pressed by a restorative force against a valve seat. The valve chamber of the first valve is fluidly connected to a first hydraulic channel, and the second valve chamber of the second valve to a second hydraulic channel. The valve bodies are operatively interconnected via a connecting device that can be displaced between a first position and a second position.

Longitudinally adjustable connecting rod

The invention relates to a length-adjustable connecting rod () for a reciprocating-piston machine, in particular for an internal combustion engine, comprising at least one first rod part () having a small connecting rod eye () and a second rod part () having a large connecting rod eye (), which two rod parts can be moved in relation to each other and/or in each other in a telescopic manner, wherein the second rod part forms a guiding cylinder () and the first rod part forms a piston element () that can be longitudinally displaced in the guiding cylinder, wherein a first high-pressure chamber () is spanned between the second rod part and the piston element on the side of the piston element facing the large connecting rod eye, into which first high-pressure chamber at least one first oil channel () leads, in which in particular a first check valve () opening in the direction of the first high-pressure chamber is arranged, wherein at least a first return channel () extends from the first high-pressure chamber, an outflow cross-section of which return channel can be closed by a control valve () in a first position and can be opened by the control valve in a second position, wherein the control valve preferably has a control piston () that can be axially displaced in an accommodating bore () of the second rod part of the connecting rod, which control piston in particular can be moved into the first position by means of a return spring () and can be moved into the second position against the force of the return spring by means of an actuating force. In order to be able to change the compression ratio as simply possible, the piston element according to the invention is designed as a piston that is operative at both ends.

Length-adjustable connecting rod

The invention relates to a multistage gearbox for motor vehicles, having a plurality of forward gears and at least one reverse gear, consisting of a plurality of 3-shaft gearboxes and a plurality of shifting elements, with a driveshaft (W), an output shaft (W) and a plurality of gearbox shafts, differential shifts and sum shafts, wherein: a first differential shaft (d) of a first 3-shaft gearbox (RS) is connected for conjoint rotation to a first differential shaft (d) of a second 3-shaft gearbox (RS); the driveshaft (W) and a sum shaft (s) of the second 3-shaft gearbox (RS) are connected for conjoint rotation; a fourth gearbox shaft (W; W) and a second differential shaft (d) of the second 3-shaft gearbox (RS) are connected for conjoint rotation; the fourth gearbox shaft (W; W) or a fifth gearbox shaft (W) is connected for conjoint rotation to a first differential shaft (d) of a third 3-shaft gearbox (RS); and a third gearbox shaft (W) and a second differential shaft (d) of the first 3-shaft gearbox (RS) are connected for conjoint rotation. A high functionality can be achieved by connecting a sum shaft (s) of a first 3-shaft gearbox (RS) for conjoint rotation to a sum shaft (s) of the third 3-shaft gearbox (RS), and by connecting the output shaft (W) and a second differential shaft (d) of the third 3-shaft gearbox (RS) for conjoint rotation.

Multistage gearbox for motor vehicles

A transmission includes a drive train having a primary drive with a primary drive shaft (), particularly for a vehicle, and includes a Ravigneaux planetary gearset () which has a double planetary gear with two sun gear shafts (), one planetary carrier shaft () and at least one ring gear shaft (), as well as an upstream single planetary gearset () which is designed as a reduction gearing and includes the gear elements of sun gear (), planetary carrier () and ring gear (). A first of the gear elements of the single planetary gear set (), particularly the sun gear (), is designed to be fixed to a housing. At least one first element of the Ravigneaux planetary gear set () is drive-connected, preferably permanently, to a secondary drive () which is particularly preferred to be in the form of an electrical machine.

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St. Stefan, Austria

Stefan Lichtenegger