Abstract: A control arrangement for an arrangement of hydraulically couplable machines has an interface for hydraulic coupling of the machines, and a hydraulic machine for supplying pressure medium to at least one hydraulic consumer of the machines in accordance with requirements. An electronic control device is configured, in accordance with a load of the consumer, to generate an electronic control signal, which can be converted by a transducer of the control arrangement into a hydraulic control signal, in accordance with which the hydraulic machine can be operated.

Abstract: A control arrangement for an arrangement of hydraulically couplable machines has an interface for hydraulic coupling of the machines, and a hydraulic machine for supplying pressure medium to at least one hydraulic consumer of the machines in accordance with requirements. An electronic control device is configured, in accordance with a load of the consumer, to generate an electronic control signal, which can be converted by a transducer of the control arrangement into a hydraulic control signal, in accordance with which the hydraulic machine can be operated.

Abstract: In order to improve an electrochemical conversion device comprising a plurality of functional elements stacked one upon the other into a stack in a stacking direction and interconnected within the stack, some of which have peripheral areas of sheet material, some of which are arranged in a stacked configuration one upon the other in a stacking direction, forming peripheral stacks, and are interconnected by way of a first element-to-element connection and some others of which are interconnected by way of a second element-to-element connection, in such a manner that the strain placed on the element-to-element connections can be kept as low as possible, it is proposed that one of the functional elements comprise a compensating unit and that the compensating unit comprise at least one deformable element which, by deformation, allows for at least one height compensation in the stacking direction.

Abstract: In order to create a method for producing an electrically insulating sealing assembly for producing a seal between two components of a fuel cell stack, which allows for production of a sealing assembly that offers long-term stability during operation of a fuel cell system and provides good gas tightness and good electrical insulation properties, a method comprising the following steps is proposed: applying an insulating layer starting material onto a substrate in a wet-chemical process; heating the insulating layer starting material to a sinter temperature so as to produce a sintered, electrically insulating, ceramic insulating layer; and directly or indirectly joining the insulating layer to the components to be sealed.

Abstract: In order to create a fuel cell unit, comprising a cathode-electrolyte-anode unit and at least one bipolar plate which is connected to an electrode of the cathode-electrolyte-anode unit in an electrically conductive manner, which has a low contact resistance between the bipolar plate and an electrode of the cathode-electrolyte-anode unit, it is suggested that the fuel cell unit comprise at least one electrically conductive intermediate element which is arranged between the bipolar plate and the electrode and has at least one contact surface facing the electrode.

Abstract: In order to provide a method of producing a sealing arrangement for a fuel cell unit by means of which there can be produced a sealing arrangement having good gas-tight properties and good electrical insulation and which exhibits long-term stability in operation of a fuel cell system, there is proposed a method of producing a sealing arrangement for a fuel cell unit which comprises the following process steps: coating a base material of a component with an oxidizable coating material; letting the coating material diffuse into the base material; oxidizing the coating material for the purposes of producing an oxide layer which has a surface resistivity of at least 1.kQ cm2 at the operating temperature of the fuel cell unit.

Abstract: In order to provide a fuel cell stack, comprising a plurality of fuel cell units that succeed one another along a stack direction and at least one tensioning device, by means of which the fuel cell units are braced against one another, in which different heat expansions of the fuel cell units, on the one hand, and of the at least one tensioning element, on the other hand, are compensated and which is nevertheless simply constructed and easy and quick to fit, it is proposed that the tensioning device comprises at least one tensioning element, which transmits a tensile force for tensioning the fuel cell units, and at least one resilient longitudinal expansion compensation element, which is integrated in a tensioning element or in a fastening device connecting two tensioning elements to one another.

Abstract: In order to produce a fuel cell stack which comprises a plurality of fuel cell units that succeed one another in the direction of the stack and at least one tensioning device by means of which the fuel cell units are braced against each other such that tensioning forces can be introduced into the stack of fuel cell units in a particularly effective manner, it is proposed that the tensioning device should comprise at least one tensioning element in the form of a strip or tape which transmits a tensional force for the tensioning of the fuel cell units and extends around at least one end face of the fuel cell stack.

Abstract: In order to produce a fuel cell stack which comprises several fuel cell units that succeed one another in the direction of the stack, at least one tensioning device by means of which the fuel cell units are braced against each other, and at least one stack end element which forms an end face boundary for the fuel cell stack such that the stack can be assembled in a particularly quick and easy manner, it is proposed that the tensioning device should comprise at least one tensioning element which transmits a tensional force for the tensioning of the fuel cell units and is hooked onto at least one stack end element.

Abstract: In order to produce a fuel cell unit comprising a cathode electrolyte anode unit and at least one contact element for making electrically conductive contact with the cathode electrolyte anode unit such that electrical contact with the KEA unit is producible in a reliable and simple manner, it is proposed that at least one contact element comprise a plate provided with a multiplicity of break-throughs.

Abstract: An arrangement for controlling the rotational speed of an output rotational part of a fluid friction coupling is provided. A fan for cooling components of a motor vehicle is coupled with a driving rotational part by way of a shearing fluid whose effective fluid quantity determines the transferrable torque. The arrangement contains an adjusting unit (which can be electrically driven in a timed manner) for the variable adjustment of the effective shearing fluid quantity and contains a temperature controller stage to which the temperature of at least one medium whose temperature can be influenced by the output rotational speed is fed. The invention, the temperature controller stage is followed by a rotational speed controller stage to which, on the input side, the output signal of the temperature controller stage is fed as the dessired rotational output speed as well as the rotational driving speed and which, via of its output signal, drives the shearing fluid quantity adjusting unit of the coupling.