Abstract: A hydrostatic traction drive has a steering function, which is implemented via two laterally acting secondary units (traction motors), which are supplied by a common primary unit (pump) in the open circuit. The primary unit is pressure-controlled. The two secondary units are torque-controlled. The affected vehicle is steerable as a function of a steering command by different torque specifications for the two secondary units. Furthermore, a hydrostatic drive for a mobile work machine has working hydraulics in addition to the traction drive. The working hydraulics are also supplied by the primary unit in parallel to the two secondary units.

Abstract: The invention relates to a method for changing gear stages in a transmission having a hydrostatic transmission and a downstream manual transmission, and a corresponding transmission arrangement. First, a desire to shift is detected within the manual transmission to change the gear stages. The hydrostatic transmission and the downstream manual transmission are activated to change the gear stage of the downstream transmission. Whether the gear stage to be engaged through a gear stage change was successfully engaged is detected by a detection device, which is connected to an electronic control unit of the transmission arrangement. If the engagement of the gear stage to be engaged is not successful, the original gear stage is reengaged. After the engagement of the original gear stage, the downstream transmission is again activated such that the gear stage to be engaged is engaged.

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 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 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: The invention concerns a method and a transmission arrangement for changing gears in a transmission with a hydrostatic transmission and a manual gearbox (4) connected downstream from it. First the output torque of a hydrostatic motor (9) is reduced. After the reduction of the output torque of the hydrostatic motor (9), an engaged gear (12, 13) of the manual gearbox (4) which is connected downstream is disengaged. An output rotational speed of the hydrostatic motor (9) corresponding to the gear (13, 12) to be engaged is determined. The gear ratio of the hydrostatic transmission is then adjusted, so that the output rotational speed of the hydrostatic motor (9) is higher than the determined corresponding output rotational speed. After this increased output rotational speed is reached, the gear (13, 12) to be engaged is engaged.

Abstract: The invention relates to a method for changing gear stages in a transmission having a hydrostatic transmission and a downstream manual transmission, and a corresponding transmission arrangement. First, a desire to shift is detected within the manual transmission to change the gear stages. The hydrostatic transmission and the downstream manual transmission are activated to change the gear stage of the downstream transmission. Whether the gear stage to be engaged through a gear stage change was successfully engaged is detected by a detection device, which is connected to an electronic control unit of the transmission arrangement. If the engagement of the gear stage to be engaged is not successful, the original gear stage is reengaged. After the engagement of the original gear stage, the downstream transmission is again activated such that the gear stage to be engaged is engaged.

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 hydrostatic drive (1) comprising at least one first hydraulic pump (4), a second hydraulic pump (5), and first, a second, a third, and a forth hydraulic motor (7, 8, 9, 10). A first connection (12) of the first hydraulic pump (4) is connected to a first connection (19) of the first hydraulic motor (7) and a first connection (20) of the third hydraulic motor (9). A first connection (16) of the second hydraulic pump (5) is connected to a first connection (26) of the second hydraulic motor (8) and a first connection (27) of the fourth hydraulic motor (10). A second connection (22) of the first hydraulic motor (7) and a second connection (29) of the fourth hydraulic motor (10) are connected to a second connection (18) of the second hydraulic pump (5). A second connection (28) of the second hydraulic motor (8) and a second connection (23) of the third hydraulic motor (9) are connected to a second connection (14) of the first hydraulic pump (4).

Abstract: The invention relates to a hydrostatic drive comprising a hydraulic pump (1) and at least one hydraulic engine (3). Said hydraulic engine (3) is contacted to a closed circuit via a first working line (5) and a second working line (6). In order to limit the swept volume flowing in one of the two working lines (5) towards the hydraulic pump (1), a volume flow divider (60) is provided in the working line (5) and allows to remove a partial volume flow from the working line (5).

Abstract: The invention concerns a method and a transmission arrangement for changing gears in a transmission with a hydrostatic transmission and a manual gearbox (4) connected downstream from it. First the output torque of a hydrostatic motor (9) is reduced. After the reduction of the output torque of the hydrostatic motor (9), an engaged gear (12, 13) of the manual gearbox (9) which is connected downstream is disengaged. An output rotational speed of the hydrostatic motor (9) corresponding to the gear (13, 12) to be engaged is determined. The gear ratio of the hydrostatic transmission is then adjusted, so that the output rotational speed of the hydrostatic motor (9) is higher than the determined corresponding output rotational speed. After this increased output rotational speed is reached, the gear (13, 12) to be engaged is engaged.

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 hydrostatic drive (1) comprising at least one first hydraulic pump (4), a second hydraulic pump (5), and first, a second, a third, and a forth hydraulic motor (7, 8, 9, 10). A first connection (12) of the first hydraulic pump (4) is connected to a first connection (19) of the first hydraulic motor (7) and a first connection (20) of the third hydraulic motor (9). A first connection (16) of the second hydraulic pump (5) is connected to a first connection (26) of the second hydraulic motor (8) and a first connection (27) of the fourth hydraulic motor (10). A second connection (22) of the first hydraulic motor (7) and a second connection (29) of the fourth hydraulic motor (10) are connected to a second connection (18) of the second hydraulic pump (5). A second connection (28) of the second hydraulic motor (8) and a second connection (23) of the third hydraulic motor (9) are connected to a second connection (14) of the first hydraulic pump (4).

Abstract: The invention relates to a hydrostatic drive comprising a hydraulic pump (1) and at least one hydraulic engine (3). Said hydraulic engine (3) is contacted to a closed circuit via a first working line (5) and a second working line (6). In order to limit the swept volume flowing in one of the two working lines (5) towards the hydraulic pump (1), a volume flow divider (60) is provided in the working line (5) and allows to remove a partial volume flow from the working line (5).

Abstract: The invention relates to a device for the output regulation of at least one variable displacement pump (1), delivering into a working line, driven by a motor, through adjustment of its displacement by means of a setting device (7) biased in the direction of maximum displacement and which can be acted upon with a setting pressure (20), having a regulation valve (18) associated with the setting device (7), which regulation valve can be acted upon by a counter-pressure corresponding to the working pressure in the working line, whereby the regulation valve (18) responds when the control pressure is greater than the counter-pressure, and so regulates the setting pressure action on the setting device (7) in the direction of a reduction of the displacement of the variable displacement pump (1) that the product of working pressure and output is constant.

Abstract: A total power regulation device for a plurality of variable displacement pumps (1, 2), each having a regulation valve (18) which regulates its displacement volume, which is acted upon--against a counter-pressure--by a control pressure corresponding to the working pressure of the variable displacement pump. When the control pressure exceeds the counter-pressure, the regulation valve regulates the variable displacement pump along a characteristic line (KL) of constant torque. To adjust the desired values of the individual drive torques simply, and to prevent torques from exceeding a desired value, an electronic control unit (16)--connected to measuring detectors (25) for detecting the displacement volumes of the variable displacement pumps--stores the desired value totals of the counter-pressures and the torque characteristic lines (KL) of the variable displacement pumps, and has a desired value setting device (27) for dividing the desired value total.

Abstract: The invention relates to a switching arrangement for the production of sequential current pulses such as for the control of flashing systems wherein the firing order can be achieved electronically. The invention further provides for a switching arrangement for sequential firing of blasting charges. Specific marginal conditions such as the maintenance of a minimum time interval between two successive explosions, due to the ratios of pressure waves, are given in the preferred embodiment.