Abstract: A hydrostatic traction drive includes a hydrostatic pump and a hydrostatic motor connected to each other in an open circuit. One of the pump and motor is pressure-regulated while the other is torque-controlled or regulated in terms of pivot angle. A braking mode is therefore possible in which the secondary-side braking torque can be adapted to the permissible primary-side supporting torque of a primary machine coupled to the pump. To further increase the braking power, even in a high rotational phase of the primary machine, the permissible drag torque thereof can be temporarily exceeded. To further increase the braking power and therefore to have high-performance braking during operation, further means for converting energy can be provided in order to adjust a secondary-side braking torque and a primary-side supporting torque independently of each other.

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 hydrostatic traction drive includes a hydrostatic pump and a hydrostatic motor connected to each other in an open circuit. One of the pump and motor is pressure-regulated while the other is torque-controlled or regulated in terms of pivot angle. A braking mode is therefore possible in which the secondary-side braking torque can be adapted to the permissible primary-side supporting torque of a primary machine coupled to the pump. To further increase the braking power, even in a high rotational phase of the primary machine, the permissible drag torque thereof can be temporarily exceeded. To further increase the braking power and therefore to have high-performance braking during operation, further means for converting energy can be provided in order to adjust a secondary-side braking torque and a primary-side supporting torque independently of each other.

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 hydrostatic transmission for a traction drive includes a first hydraulic machine that is coupled to a drive machine and that has an adjustable displacement volume and a second hydraulic machine that is fluidically connected to the first hydraulic machine and that is coupled to a drive output of the traction drive. At the first hydraulic machine, a control pressure acts in the direction of an enlargement of its displacement volume and a working pressure of the second hydraulic machine acts in the opposite direction. The hydrostatic transmission further includes a control device that varies the control pressure to influence a torque of the second hydraulic machine. The control device stores a characteristic map by which a setpoint control pressure is determined as a function of a setpoint torque and a displacement volume of the second hydraulic machine so as to regulate the torque of the second hydraulic machine.

Abstract: A hydrostatic transmission for a traction drive includes a first hydraulic machine that is coupled to a drive machine and that has an adjustable displacement volume and a second hydraulic machine that is fluidically connected to the first hydraulic machine and that is coupled to a drive output of the traction drive. At the first hydraulic machine, a control pressure acts in the direction of an enlargement of its displacement volume and a working pressure of the second hydraulic machine acts in the opposite direction. The hydrostatic transmission further includes a control device that varies the control pressure to influence a torque of the second hydraulic machine. The control device stores a characteristic map by which a setpoint control pressure is determined as a function of a setpoint torque and a displacement volume of the second hydraulic machine so as to regulate the torque of the second hydraulic machine.

Abstract: A hydraulic arrangement includes at least one pressure unit connected to a hydraulic machine that is operable as a pump and a safety device for the pressure unit. The safety device includes pressure sensors configured to detect a pressure in the pressure unit and an electronic control unit that is connected to the pressure sensors. A delivery volume pumped by the hydraulic machine is configured to be controlled via the control unit.

Abstract: The invention relates to a hydraulic accumulator device in the form of a membrane accumulator, comprising a membrane (16) which separates a pneumatic volume from a hydraulic volume. In order to improve said hydraulic accumulator device with respect to the degree of efficiency and/or manufacturing costs, the membrane (16) is tensioned between two holding bodies (4,5) which respectively comprise several recesses (11-14) and between which the membrane (16) is tensioned in order to produce several hydropneumatic membrane accumulators.

Abstract: A drive includes a hydraulic machine configured to convert kinetic energy into hydraulic energy and a hydrostatic energy store configured to be charged by the hydraulic machine. The drive further includes a control device configured to control the preloading of the store as a function of an operating state of a device driven by the drive. A hydrostatic energy store for a drive of a device includes a hydraulic machine which converts kinetic energy into hydraulic energy and charges the store. The store further includes a control device configured to vary a preloading of the store as a function of an operating state of the device. A method for adapting a preloading of a hydrostatic energy store includes determining an operating state of the device, determining the optimum preloading as a function of the determined operating state, and setting the preloading. A control device controls the setting of the preloading.

Abstract: A hydraulic arrangement includes at least one pressure unit connected to a hydraulic machine that is operable as a pump and a safety device for the pressure unit. The safety device includes pressure sensors configured to detect a pressure in the pressure unit and an electronic control unit that is connected to the pressure sensors. A delivery volume pumped by the hydraulic machine is configured to be controlled via the control unit.

Abstract: A hydrostatic fan drive for internal combustion engines is disclosed, having a primary unit that can be driven by the internal combustion engine, and having a fan motor by means of which a blower fan can be driven. A hydraulic reservoir is disposed at a high-pressure line connecting the primary unit to the fan motor. A hybrid fan drive for internal combustion engines is thus provided, allowing fan operation even if the internal combustion engine is switched off. An increased maximal available power of the internal combustion engine is available in transition, despite the fan operation, because the fan motor can be supplied with pressurized media by the hydraulic reservoir in such cases (in transition).

Abstract: A hydrostatic system includes a hydropneumatic accumulator which is connected via a hydraulic resistance to a compensating volume. Means are provided in the hydrostatic system for measuring a pressure prevailing on that side of the hydraulic resistance which faces towards the compensating volume. A volume flow restricting device may be actuated if the pressure prevailing there exceeds a limit value.

Abstract: An apparatus for energy recovery is provided. The apparatus comprises a hydrostatic machine and at least one hydraulic storage component. The hydraulic storage component is connected to the hydrostatic machine via a working line. A valve device is provided for influencing the volumetric flow in the working line between the hydraulic storage component and the hydrostatic machine. The valve device comprises a brake pressure regulating valve unit with a valve and a pilot valve unit which acts on the valve with a control pressure. The invention also relates to a method for controlling the apparatus for energy recovery. In order to store released energy, a required braking torque is determined by a control electronics system. The volume from the hydrostatic piston machine into the working line is increased and the pilot valve is actuated by the control electronics system such that the valve is moved towards its open position.

Abstract: A method of controlling a hydrostatic drive is provided. The hydrostatic drive has a hydraulic pump and a hydraulic engine. The hydrostatic drive further has a first and a second hydraulic reservoir for storing and recuperating energy. Pressure energy is stored in the first reservoir. For the purpose of recuperating the pressure energy stored in the first reservoir, the first reservoir is connected to a suction side of the hydraulic pump. A downstream working line of the hydraulic engine is connected to the second reservoir. In addition, the downstream working-line connection of the hydraulic engine is disconnected from the suction side of the hydraulic pump.

Abstract: The invention relates to a drive system (1) having a travel drive, a working hydraulic system (3) and a device for hydrostatic braking (4). The device for hydrostatic braking has a first hydrostatic piston machine (12) which is connected to a drive train (2), wherein the first hydrostatic piston machine (12) is connected via an accumulator line (14) to a pressure accumulator (15) and the accumulator line (14) is connected via an accumulator pressure line (16) to the working hydraulic system (3). As an alternative, the drive system (100) additionally has a second hydrostatic piston machine (13) which is connected mechanically to the first hydrostatic piston machine (12), wherein the first hydrostatic piston machine (12) is connected in the closed circuit via the accumulator line (14) to the pressure accumulator (15), and the second hydrostatic piston machine is connected in the open circuit via a working line (16) to the working hydraulic system (3).

Abstract: An apparatus for energy recovery is provided. The apparatus comprises a hydrostatic machine and at least one hydraulic storage component. The hydraulic storage component is connected to the hydrostatic machine via a working line. A valve device is provided for influencing the volumetric flow in the working line between the hydraulic storage component and the hydrostatic machine. The valve device comprises a brake pressure regulating valve unit with a valve and a pilot valve unit which acts on the valve with a control pressure. The invention also relates to a method for controlling the apparatus for energy recovery. In order to store released energy, a required braking torque is determined by a control electronics system. The volume from the hydrostatic piston machine into the working line is increased and the pilot valve is actuated by the control electronics system such that the valve is moved towards its open position.

Abstract: The invention relates to a method of controlling a hydrostatic drive (1). Said hydrostatic drive (1) comprises a hydraulic pump (3) and a hydraulic engine (7). Said hydrostatic drive (1) also comprises a first and a second hydraulic reservoir (40, 41) for storing and recuperating energy. Pressure energy is stored in the first reservoir (40). For the purpose of recuperating the pressure energy stored in the first reservoir (40), said first reservoir (40) is connected to a suction side of the hydraulic pump (3). A downstream working line (8, 9) of the hydraulic engine (7) is connected to the second reservoir (41). In addition, the downstream working-line connection (9, 8) of said hydraulic engine (7) is disconnected from the suction side of the hydraulic pump (3).