Abstract:
In an axial piston machine with variable displacement with tilted cylinder block, a distributor is coupled with the cylinder block, and a magnetostrictive position sensor has a magnet that is integral with the distributor and a sensor rod that is integral with a fixed body with which the distributor is coupled with the possibility of varying the tilt thereof. The sensor emits a signal that indicates the angular position of the distributor with respect to the fixed body to determine the actual displacement of the machine.
Abstract:
Die Erfindung betrifft ein hydraulisches System mit einer verstellbaren hydrostatischen Maschine (2) mit einem Verstellmechanismus. Der Verstellmechanismus wirkt mit einer Stellvorrichtung zusammen, die zumindest einen einen Stelldruckraum begrenzenden Stellkolben (8) aufweist. Das System weist ein Regelventil (16) auf, mit dem zur Verschiebung des Stellkolbens (8) und damit zur Betätigung der Verstellvorrichtung die Zu- und Abfuhr von Druckmittel in oder aus dem Stelldruckraum (12) steuerbar ist, wobei das Regelventil (16) einen Ventilkolben aufweist, der mit einer von der Position des Verstellmechanismus abhängigen Kraft einer Rückkoppelfeder beaufschlagt ist. Der Ventilkolben ist zusätzlich mit einer gegen die Kraft der Rückkoppelfeder wirkenden Gegenkraft beaufschlagt und es ist ein Betätigungsmittel (24) vorgesehen, mit dem der Ventilkolben mit einer gleichsinnig mit der Gegenkraft wirkenden oder mit einer entgegen die Gegenkraft wirkenden Steuerkraft beaufschlagbar ist.
Abstract:
The invention is directed to a swashplate angle sensor (10) for a variable displacement hydraulic unit (1). The hydraulic unit (1) comprising a housing (2), within which a swashplate (3) with a rod shaped feedback-link (12) fixedly attached to the swashplate (3) is arranged pivotable around a swashplate axis (7). The angle sensor (10) comprising a magnet (16) mounted rotatable on a magnet carrier (13), and a sensor (15) for sensing the orientation of the magnet (16). The magnet carrier (13) is located in a control block (14) attached to the housing (2) and is located parallel to the feedback-link (12). The magnet carrier (13) is rotatable around a sensor axis (18) being parallel to the swashplate axis (7). A linkage spring (11) provides a connection between the feedback-link (12) and the magnet carrier (13) such that a pivoting of the swashplate (3) with the feedback-link (12) causes a rotation of the magnet carrier (13).
Abstract:
An embodiment the invention relates to a yoke position sensor system (7) for a hydraulic device (1), such as a pump or motor, provided with a moveable yoke (3) which is used for varying the displacement of the hydraulic device (1) and to a method for sensing the position of a yoke (3) relative to a housing (2). The housing (2) and the yoke (3) are movably and rotatably connected to each other. When the yoke (3) is rotated, there is a yoke angle sensor (5) indicating the degrees of rotation of the yoke and a yoke angle of zero corresponds to a zero displacement volume. The hydraulic device (1) includes a second yoke angle sensor (7) constructed to indicate when the yoke angle is within or outside an interval including the zero displacement angle.
Abstract:
A variable capacity hydraulic machine has a rotating group located within a casing and a control housing secured to the casing to extend across and seal an opening in the casing. The control housing accommodates a control circuit and a pair of sensors to sense change in parameters associated with the rotating group. One of the sensors is positioned adjacent the barrel on the rotating group to sense rotational speed and the other senses displacement of the swashplate. The control housing accommodates a control valve and accumulator to supply fluid to the control valve.
Abstract:
A hydrostatic drive system (1) has a load-sensing pump (2) with an adjustable discharge volume and at least one consumer connected to the pump (2). The discharge volume of the pump (2) can be set by a discharge volume control device (6) that sets the delivery pressure of the pump available in a delivery line (4) of the pump (2) so that it is higher by a pilot control pressure difference than the load pressure of the consumer. The discharge volume control device (6) can be actuated by an electronic control device (7) functionally connected with a sensor device (9) for measuring the load pressure of the consumer and with a sensor device (8) for measuring the delivery pressure available in the delivery line (4). A circulation device (15) is associated with the delivery line (4) to control the connection of the delivery line (4) with a reservoir (3).
Abstract:
An axial piston machine in a swash-plate construction with an actuating device. The actuating device comprises a actuating piston and a mating piston. The actuating piston and the mating piston are connected to the swash plate each with the first end thereof and can be applied with the second end thereof with a force acting in the direction of the first end. For resetting the swash plate in the direction of a resting position, an elastic element is provided on the actuating piston and on the mating piston, which is supported on a spring bearing arranged on the first side facing the swash plate of the actuating piston or of the mating piston. In the other direction, the elastic element is supported on a second spring bearing arranged on the end facing away from the swash plate of the actuating piston or of the mating piston. When the swash plate is deflected from the resting position, the second spring bearing of the actuating piston or of the mating piston is supported on a counter bearing on the housing side. The second spring bearing of the respective other actuating bearing or mating bearing is supported on a counter bearing on the piston side.
Abstract:
A fluid device includes a variable swashplate adapted for movement between a first position and a second position. A control piston is adapted to selectively move the variable swashplate between the first and second positions. A control valve is in fluid communication with the control piston. The control valve includes a sleeve defining a spool bore, at least one fluid inlet passage in fluid communication with a fluid source and at least one control passage in fluid communication with the control piston. The control fluid passage includes an opening at the spool bore. A spool is disposed in the spool bore of the sleeve. The spool includes a metering surface that selectively communicates fluid between the fluid inlet passage and the control fluid passage. The metering surface has a first end and a second end. The metering surface having a tapered surface disposed between the first and second ends.
Abstract:
A fuel injection control unit, including an electronic governor and a controller for an engine performs control in a governor region based on an isochronous characteristic. A working machine controller receives a delivery pressure signal P and controls a regulator such that, when the delivery pressure of a hydraulic pump exceeds a predetermined pressure P1, the displacement of the hydraulic pump does not exceed a value decided in accordance with a preset pump absorption torque curve. The working machine controller controls the regulator such that, when the delivery pressure of the hydraulic pump 2 is not higher than the predetermined pressure P1, the displacement of the hydraulic pump is increased as the delivery pressure of the hydraulic pump lowers from the predetermined pressure P1.
Abstract translation:包括电子调速器和发动机的燃料喷射控制单元基于等时特性在调速器区域中进行控制。 工作机械控制器接收输送压力信号P并控制调节器,使得当液压泵的输送压力超过预定压力P 1时,液压泵的排量不超过根据预设泵确定的值 吸收扭矩曲线。 工作机械控制器控制调节器,使得当液压泵2的输送压力不高于预定压力P 1时,随着液压泵的输送压力从预定压力降低,液压泵的排量增加 P 1。
Abstract:
A method and apparatus for controlling the motor output speed of a variable displacement hydraulic motor are disclosed. The method may include determining a value indicative of a motor output speed, determining a value indicative of a desired motor output speed, determining a desired position of a control valve using a nonlinear feedback control law, and controlling the motor output speed as a function of the control valve position, wherein the nonlinear feedback control creates a first order system response.