Abstract: The present application relates to spirobifluorene derivatives of a formula (I), to the use thereof in electronic devices, and to processes for preparing said derivatives.

Abstract: The present application relates to a compound of a formula (I) which contains a spirobifluorene basic structure condensed onto a benzofuran unit. The application furthermore relates to a process for the preparation of the compound of the formula (I), and to the use of the compound of the formula (I) in an electronic device.

Abstract: The present application relates to spirobifluorene derivatives of a formula (I), to the use thereof in electronic devices, and to processes for preparing said derivatives.

Abstract: The present application relates to spirobifluorene derivatives of a formula (I), to the use thereof in electronic devices, and to processes for preparing said derivatives.

Abstract: The present application relates to a compound of a formula (I) which contains a spirobifluorene basic structure condensed onto a benzofuran unit. The application furthermore relates to a process for the preparation of the compound of the formula (I), and to the use of the compound of the formula (I) in an electronic device.

Abstract: The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to electronic devices which comprise these compounds.

Abstract: The present invention relates to compounds of formula (1) which are suitable for use in electronic devices, especially in organic electroluminescent devices.

Abstract: The present application relates to a compound of a formula (I) which contains a spirobifluorene basic structure condensed onto a benzofuran unit. The application furthermore relates to a process for the preparation of the compound of the formula (I), and to the use of the compound of the formula (I) in an electronic device.

Abstract: The present application relates to heterospirobifluorene compounds, to a process for the preparation thereof, and to electronic devices, in particular organic electroluminescent devices, comprising the heterospirobifluorene derivatives.

Abstract: The invention relates to phenanthrene compounds comprising one or more arylamino groups. Said compounds can be used in electronic devices, in particular OLED's.

Abstract: The present invention relates to certain fluorenes, to the use of the compounds in an electronic device, and to an electronic device comprising at least one of these compounds. Furthermore, the present invention relates to a process for the preparation of the compounds and to a formulation and composition comprising one or more of the compounds.

Abstract: The present application relates to a compound of a formula (I) which contains a spirobifluorene basic structure condensed onto a benzofuran unit. The application furthermore relates to a process for the preparation of the compound of the formula (I), and to the use of the compound of the formula (I) in an electronic device.

Abstract: A method for predefining a rotational speed of a drive machine of a drive system is disclosed. The method involves at least the drive machine and a hydrostatic drive unit, wherein the rotational speed which is to be predefined for the drive machine is determined as a function of an instantaneous system state and a predicted system state of the drive system.

Abstract: A hydraulic supply system for a hydraulically actuated automatic transmission, in particular for a belt-driven conical-pulley transmission. The system includes a primary pump driven by a primary drive system to provide pressure in a supply line connected to a regulating valve. The supply line is connected through a pilot valve to a control line in which a control valve is situated, with which the pressure that determines the setting of a transmission ratio adjusting valve is set. An auxiliary pump driven by an auxiliary drive system that is separate from the primary drive system includes an outlet line connected to the control line through a first valve that opens in the direction of the control line, and is connected to the supply line through a second valve that opens in the direction of the supply line.

Abstract: A hydraulic system for actuating a belt-driven conical-pulley transmission having a variably adjustable transmission ratio, of a vehicle, including at least one hydraulic energy source and having a torque sensor that is supplied with working medium by a pump flow of the hydraulic energy source. A disconnection valve is connected between the hydraulic energy source and the torque sensor, which makes it possible to connect or disconnect an additional pump flow of the hydraulic energy source, depending on need.

Abstract: A hydraulic system for controlling a belt-driven conical-pulley transmission. A pump draws a working medium from a working medium tank or through a cooler return valve from a cooler return line. The cooler return valve is a minimum pressure valve that holds closed a connection between the cooler return line and a pump inlet line through the cooler return valve, as long as the pressure in the cooler return line remains below a specified minimum pressure. The cooler return valve also opens the connection between the cooler return line and the pump inlet line through the cooler return valve as soon as the specified minimum pressure in the cooler return line is exceeded.

Abstract: A hydraulic system for an automatic transmission operatively connected to an internal combustion engine that is operable in a start-stop mode. The hydraulic system includes a hydraulic energy source to supply the hydraulic system with hydraulic energy, the hydraulic energy source including at least one electrically driven hydraulic pump to supply the hydraulic system with hydraulic energy during a stopping phase of the internal combustion engine. To achieve a reduction in fuel consumption and CO2 emissions, provision is included to enable the electrically driven hydraulic pump to be switched on in addition to a mechanically driven hydraulic pump, as needed during an operating phase of the internal combustion engine.

Abstract: The invention relates to a hydraulic system for actuating a continuously variable belt-driven conical-pulley transmission having two conical pulleys encircled by an endless torque-transmitting means, each of which comprises two conical disks, one of which is axially movable depending on the pressure in an associated pressing chamber, and having a torque sensor which includes a torque sensing chamber that is connected to a hydraulic energy source and is linked with the pressing chambers. The invention is distinguished by the fact that the pressing chambers are connected via a first hydraulic resistance element to the torque sensing chamber, and via a second hydraulic resistance element to an additional pressure chamber, in which a lower pressure prevails than in the pressing chambers and/or the torque sensing chamber.

Abstract: A method for predefining a rotational speed of a drive machine of a drive system is disclosed. The method involves at least the drive machine and a hydrostatic drive unit, wherein the rotational speed which is to be predefined for the drive machine is determined as a function of an instantaneous system state and a predicted system state of the drive system.

Abstract: The invention relates to a hydraulic system for actuating a belt-driven conical-pulley transmission with a variably adjustable transmission ratio, of a vehicle, having at least one hydraulic energy source and having a moment sensor that is supplied with working medium by a pump flow of the hydraulic energy source. The invention is distinguished in that a disconnecting valve device is connected between the hydraulic energy source and the moment sensor, which makes it possible to connect or disconnect an additional pump flow of the hydraulic energy source, depending on need.