Abstract: The invention relates to a hydraulic machine, in particular to a hydraulic motor with two working lines, from one of which a high pressure line and from the other one a low pressure line is branched off. An electronic control unit and a servo displacement unit are provided to control the displacement of the displacement volume of a drive mechanism of the hydraulic machine, wherein the displacement volume can be determinated by the displacement of a servo piston within the servo displacement unit. For this, the servo piston can be loaded at least on one side via a servo pressure line with hydraulic fluid under servo pressure, wherein the servo pressure level can be adjusted by a control spool arranged moveable within a control valve. For this, hydraulic fluid from the low pressure line or, perhaps, from the high pressure line is guidable via the control valve to the servo pressure line if a suitable control signal is available at a switching valve.

Abstract: The invention relates to a signal inducing device (1, 9, 11, 12, 18, 19, 20), comprising a first material (2, 3, 13, 14) and a second material (4, 16). The first material (2, 3, 13, 14) and the second material (4, 16) show a different magnetic behaviour. The first material (2, 3, 13, 14) and the second material (4, 16) are arranged in a way that the resulting magnetic behaviour of the signal inducing device (1, 9, 11, 12, 18, 19, 20) varies over a magnetic interaction surface (5, 10) of the signal inducing device (1, 9, 11, 12, 18, 19, 20). The signal inducing device (1, 9, 11, 12, 18, 19, 20) is designed in a way that the magnetic interaction surface (5, 10) shows an essentially smooth surface, in particular with respect to the standard moving direction of the magnetic interaction surface (5, 10).

Abstract: The invention relates to a signal inducing device (1, 9, 11, 12, 18, 19, 20), comprising a first material (2, 3, 13, 14) and a second material (4, 16). The first material (2, 3, 13, 14) and the second material (4, 16) show a different magnetic behaviour. The first material (2, 3, 13, 14) and the second material (4, 16) are arranged in a way that the resulting magnetic behaviour of the signal inducing device (1, 9, 11, 12, 18, 19, 20) varies over a magnetic interaction surface (5, 10) of the signal inducing device (1, 9, 11, 12, 18, 19, 20). The signal inducing device (1, 9, 11, 12, 18, 19, 20) is designed in a way that the magnetic interaction surface (5, 10) shows an essentially smooth surface, in particular with respect to the standard moving direction of the magnetic interaction surface (5, 10).

Abstract: The invention relates to a signal inducing device (1, 9, 11, 12, 18, 19, 20), comprising a first material (2, 3, 13, 14) and a second material (4, 16). The first material (2, 3, 13, 14) and the second material (4, 16) show a different magnetic behavior. The first material (2, 3, 13, 14) and the second material (4, 16) are arranged in a way that the resulting magnetic behavior of the signal inducing device (1, 9, 11, 12, 18, 19, 20) varies over a magnetic interaction surface (5, 10) of the signal inducing device (1, 9, 11, 12, 18, 19, 20). The signal inducing device (1, 9, 11, 12, 18, 19, 20) is designed in a way that the magnetic interaction surface (5, 10) shows an essentially smooth surface, in particular with respect to the standard moving direction of the magnetic interaction surface (5, 10).

Abstract: The invention relates to a signal inducing device (1, 9, 11, 12, 18, 19, 20), comprising a first material (2, 3, 13, 14) and a second material (4, 16). The first material (2, 3, 13, 14) and the second material (4, 16) show a different magnetic behaviour. The first material (2, 3, 13, 14) and the second material (4, 16) are arranged in a way that the resulting magnetic behaviour of the signal inducing device (1, 9, 11, 12, 18, 19, 20) varies over a magnetic interaction surface (5, 10) of the signal inducing device (1, 9, 11, 12, 18, 19, 20). The signal inducing device (1, 9, 11, 12, 18, 19, 20) is designed in a way that the magnetic interaction surface (5, 10) shows an essentially smooth surface, in particular with respect to the standard moving direction of the magnetic interaction surface (5, 10).

Abstract: The invention relates to a hydraulic machine, in particular to a hydraulic motor with two working lines, from one of which a high pressure line and from the other one a low pressure line is branched off. An electronic control unit and a servo displacement unit are provided to control the displacement of the displacement volume of a drive mechanism of the hydraulic machine, wherein the displacement volume can be determinated by the displacement of a servo piston within the servo displacement unit. For this, the servo piston can be loaded at least on one side via a servo pressure line with hydraulic fluid under servo pressure, wherein the servo pressure level can be adjusted by a control spool arranged moveable within a control valve. For this, hydraulic fluid from the low pressure line or, perhaps, from the high pressure line is guidable via the control valve to the servo pressure line if a suitable control signal is available at a switching valve.

Abstract: Hydraulic motor for driving a work equipment comprising a hydraulic drive mechanism with a high pressure side and a low pressure side. On the low pressure side a first throttle orifice and a second throttle orifice within a first bypass line bypassing the first throttle orifice are arranged, whereby at least the throttle orifice opening of the second throttle orifice is adjustable.

Abstract: A hydrostatic adjustment unit with a swash plate for adjusting the stroke of displacer pistons which are arranged in a rotating cylinder block is described. The displacer pistons each have a slider block which bears against a support face of the swash plate and is held in abutment by means of a slider block holder. The slider block-holder has a number of bores for receiving the slider blocks corresponding to the number of displacers. The slider block holder at the same time forms the rotor of a rotational speed signal transmitter for determining the rotational speed of the cylinder block.

Abstract: An axial piston machine having a swashplate or an oblique axis which can be adjusted by means of servopistons and has a valve segment and an adjustment unit for the electrically proportional adjustment of the volumetric displacement. The adjustment unit comprises proportional magnets which can be activated electrically, and a control piston for controlling the oil pressure which moves the servopistons. The proportional magnets act on the control piston along a common tappet axis, a feedback device for feeding back the current swashplate or oblique-axis valve-segment position to the control piston being provided. The feedback device comprises spring levers 6, 6? which can pivot about an axis, the spring levers 6, 6? each being mounted on the pivot axis 5 with a bearing shell 15, which are each composed of two component shells which support the spring lever 6, 6? at separate locations on the pivot axis 5, and which each essentially enclose a half-space about the pivot axis 5.

Abstract: In the housing 1 of a hydraulic machine, the pressure Pi acts in the chamber 2. For this purpose, a passage opening 4 is provided, which is formed as a valve seat 5. A valve body 6 can be displaced longitudinally in the housing 1 and forms a pressure-tight spring chamber for an inner valve spring 21. The spring chamber is connected to the chamber 2 via a pressure equalizing hole 9. The prestress of the inner valve spring 21 can be set by means of a setting screw 18. In addition, there is an outer valve spring 22. Both the valve springs load the valve body 6 with the effect of closing it. The pressure equalizing valve described combines a compact design with an advantageous flow characteristic. When a maximum value of p1 is reached, the valve body 6 lifts off the valve seat 5 and hydraulic fluid from the chamber 2 flows away via the valve chamber 3.

Abstract: An axial piston machine having a swash plate or oblique axis which can be adjusted by means of servopistons and has a valve segment and an adjustment unit for the electrically proportional adjustment of the volumetric displacement, the adjustment unit comprising proportional magnets which can be activated electrically, and a control piston for controlling the oil pressure which moves the servopistons, the proportional magnets acting on this control piston along a common tappet axis. A feedback device for feeding back the current swash plate or oblique axis valve segment position is provided. The feedback device comprises spring levers and a pointer which can be pivoted about an axis, the pointer which is embodied as a two-armed lever engaging in the control piston on one side of the pivot axis, and between the spring levers on the other side.

Abstract: An axial piston machine having a swashplate or an oblique axis which can be adjusted by means of servopistons and has a valve segment and an adjustment unit for the electrically proportional adjustment of the volumetric displacement. The adjustment unit comprises proportional magnets which can be activated electrically, and a control piston for controlling the oil pressure which moves the servopistons. The proportional magnets act on the control piston along a common tappet axis, a feedback device for feeding back the current swashplate or oblique-axis valve-segment position to the control piston being provided. The feedback device comprises spring levers 6, 6? which can pivot about an axis, the spring levers 6, 6? each being mounted on the pivot axis 5 with a bearing shell 15, which are each composed of two component shells which support the spring lever 6, 6? at separate locations on the pivot axis 5, and which each essentially enclose a half-space about the pivot axis 5.

Abstract: An axial piston machine having a swash plate or oblique axis which can be adjusted by means of servopistons and has a valve segment and an adjustment unit for the electrically proportional adjustment of the volumetric displacement, the adjustment unit comprising proportional magnets which can be activated electrically, and a control piston for controlling the oil pressure which moves the servopistons, the proportional magnets acting on this control piston along a common tappet axis. A feedback device for feeding back the current swash plate or oblique axis valve segment position is provided. The feedback device comprises spring levers and a pointer which can be pivoted about an axis, the pointer which is embodied as a two-armed lever engaging in the control piston on one side of the pivot axis, and between the spring levers on the other side.

Abstract: In the housing 1 of a hydraulic machine, the pressure Pi acts in the chamber 2. For this purpose, a passage opening 4 is provided, which is formed as a valve seat 5. A valve body 6 can be displaced longitudinally in the housing 1 and forms a pressure-tight spring chamber for an inner valve spring 21. The spring chamber is connected to the chamber 2 via a pressure equalizing hole 9. The prestress of the inner valve spring 21 can be set by means of a setting screw 18. In addition, there is an outer valve spring 22. Both the valve springs load the valve body 6 with the effect of closing it. The pressure equalizing valve described combines a compact design with an advantageous flow characteristic. When a maximum value of p1 is reached, the valve body 6 lifts off the valve seat 5 and hydraulic fluid from the chamber 2 flows away via the valve chamber 3.

Abstract: A hydrostatic adjustment unit with a swash plate for adjusting the stroke of displacer pistons which are arranged in a rotating cylinder block is described. The displacer pistons each have a slider block which bears against a support face of the swash plate and is held in abutment by means of a slider block holder. The slider block-holder has a number of bores for receiving the slider blocks corresponding to the number of displacers. The slider block holder at the same time forms the rotor of a rotational speed signal transmitter for determining the rotational speed of the cylinder block.

Abstract: A system for automatically holding a predetermined course in a vehicle with a two-train hydrostatic traction drive, comprising a measurement device (5) for detecting the actual rotational movement of the vehicle around a vertical axis of the vehicle, and for providing a first signal representing the rotational movement. An electronic controller (1) operatively associated with the measurement device (5) to evaluate the first signal to determine the deviation of the first signal from the predetermined course of the vehicle to form a control signal to hydrostatic transmissions of the two-train hydrostatic drive to operate and to provide a course correction.

Abstract: A hydrostatic vehicle drive has a control (5) for controlling an output torque of the drive and another control device (5) for controlling the output torque of a hydrostatic drive, the control device (5) having a controllable pressure-limiting valve (6) by means of which the working pressure can be adjusted and which is used for sensitive control of the output torque of a hydraulic motor (3). The pressure-limiting valve (6) can be controlled by a proportionally adjustable pressure-reducing valve (7).

Abstract: A hydrostatic vehicle drive has a control (5) for controlling an output torque of the drive and another control device (5) for controlling the output torque of a hydrostatic drive, the control device (5) having a controllable pressure-limiting valve (6) by means of which the working pressure can be adjusted and which is used for sensitive control of the output torque of a hydraulic motor (3). The pressure-limiting valve (6) can be controlled by a proportionally adjustable pressure-reducing valve (7).