Abstract: A hydrostatic drive, especially a hydrostatic fan drive, includes a hydraulic constant-displacement pump configured to drive a hydraulic motor for a fan. The drive further includes a hydraulic machine configured to supply a second hydraulic circuit with a pressure medium. The constant-displacement pump is configured to be hydraulically combined with the hydraulic machine.

Abstract: A hydraulic device including an autonomous electronic sensor assembly that has at least one miniature sensing element. Sensing elements of this type require a minimal amount of space. It is especially preferred if the sensor assembly has at least one miniature transmitter. As the hydraulic device does not then require any sensitive electric cables for signal transmission, the reliability of its monitoring capabilities is optimized.

Abstract: A sensor arrangement for a hydraulic displacer unit includes a plurality of sensors which, at least in some sections, are positioned jointly in a sensor housing. The sensors are configured to be contacted via a common plug.

Abstract: A hydrostatic drive, especially a hydrostatic fan drive, includes a hydraulic constant-displacement pump configured to drive a hydraulic motor for a fan. The drive further includes a hydraulic machine configured to supply a second hydraulic circuit with a pressure medium. The constant-displacement pump is configured to be hydraulically combined with the hydraulic machine.

Abstract: The invention relates to a drive system and to a method for monitoring a hydrostatic drive (1). The hydrostatic drive (1) has at least one hydrostatic piston engine (2) on which a control unit (6, 6?), which controls the hydrostatic piston engine (2, 2?), is arranged, wherein the control unit (6, 6?) is connected to a central control device (13), which controls the drive system (1), via a first interface (14). Control signals for controlling the drive system (1) can be transmitted using the first interface (14). The central control device (13) is additionally connected to the control unit (6) via a second interface (26, 26?), and a switch-off signal can be transmitted from the control unit (6, 6?) to the central control device (13) and/or from the central control device (13) to the control unit (6, 6?) using the second interface (26, 26?).

Abstract: The invention relates to a hydraulic device comprising an autonomous electronic sensor assembly that has at least one miniature sensing element. Sensing elements of this type require a minimal amount of space. It is especially preferred if the sensor assembly has at least one miniature transmitter. As the hydraulic device does not then require any sensitive electric cables for signal transmission, the reliability of its monitoring capabilities is optimised.

Abstract: A regulating device for a hydrostatic piston engine is provided. The regulating device (30) has an electronic control unit (17) for generating adjusting signals. An adjusting position of the hydrostatic piston engine scanned by a feedback element (36, 61) is detected by a sensor element (42) of the electronic control unit (17) without contact.

Abstract: The invention related to a hydrostatic drive comprising a hydraulic pump (3) which is driven by a drive machine (2) and pumps into at least one first working line (4), and a pressure line (18) in which a feed quantity dependent on the speed of the drive machine (2) flows. When a differential pressure value in the pressure line (18) is exceeded, the pressure means can be extracted from the first working line (4).

Abstract: The invention relates to a regulating device for a hydrostatic piston engine. The regulating device (30) has an electronic control unit (17) for generating adjusting signals. An adjusting position of the hydrostatic piston engine scanned by a feedback element (36, 61) is detected by a sensor element (42) of the electronic control unit (17) without contact.

Abstract: The invention relates to a drive system and to a method for monitoring a hydrostatic drive (1). The hydrostatic drive (1) has at least one hydrostatic piston engine (2) on which a control unit (6, 6?), which controls the hydrostatic piston engine (2, 2?), is arranged, wherein the control unit (6, 6?) is connected to a central control device (13), which controls the drive system (1), via a first interface (14). Control signals for controlling the drive system (1) can be transmitted using the first interface (14). The central control device (13) is additionally connected to the control unit (6) via a second interface (26, 26?), and a switch-off signal can be transmitted from the control unit (6, 6?) to the central control device (13) and/or from the central control device (13) to the control unit (6, 6?) using the second interface (26, 26?).

Abstract: The invention relates to a control valve unit (9) for a variation device of a hydrostatic piston engine. The control valve unit (9) comprises a valve housing (34), in which a valve element is disposed in a longitudinally displaceable manner. The valve element is adjustable from a neutral position in the direction of a first end position and an oppositely directed second end position. With increasing adjustment of the valve element a first or a second output port (35a, 35b) is increasingly connected to an input port (12). The respective other output port (35b, 35a) is at the same time increasingly connected to a relief line (13). The valve element comprises a first valve piston (32a) and a second valve piston (32b), which act upon one another via an elastic element (27).

Abstract: The invention related to a hydrostatic drive comprising a hydraulic pump (3) which is driven by a drive machine (2) and pumps into at least one first working line(4), and a pressure line (18) in which a feed quantity dependent on the speed of the drive machine (2) flows. When a differential pressure value in the pressure line (18) is exceeded, the pressure means can be extracted from the first working line (4).