Abstract:
A variable-displacement, axial piston-type hydraulic fluid pump having a pump housing (12) is provided with co-operating pump rotational speed, thrust plate position, and working pressure operating-condition sensor assemblies (100) that are partially contained within the pump housing (12), that are partially contained within a separate position sensor housing (110) which is removably secured to the pump housing (12), and that are sealed against high-pressure fluid leakage using only static resilient fluid pressure seals (114).
Abstract:
A variable-displacement, axial piston-type hydraulic fluid pump having a pump housing (12) is provided with co-operating pump rotational speed, thrust plate position, and working pressure operating-condition sensor assemblies (100) that are partially contained within the pump housing (12), that are partially contained within a separate position sensor housing (110) which is removably secured to the pump housing (12), and that are sealed against high-pressure fluid leakage using only static resilient fluid pressure seals (114).
Abstract:
A device is disclosed for regulating the total output of several variable displacement pumps (1, 2) provided each with a regulating valve (18) for regulating the displaced volume. A control pressure that corresponds to the working pressure of the variable displacement pumps is applied to the regulating valves (18) against a counterpressure. The regulating valve (18) responds when the control pressure exceeds the counterpressure, regulating the variable displacement pump according to a characteristic curve (KL) of constant torque. In order to adjust the individual driving torques in a simple manner and to prevent the torques from exceeding the set values, an electronic control unit (16) is connected to the measurement sensor (25) that senses the volumes displaced by the variable displacement pumps. The electronic control unit (16) stores the sum of the set values of the counterpressures and the torque characteristic curves (KL) of the variable displacement pumps and has a set value regulator (27) that distributes the set value sum. The electronic control unit (16) further sets said torque characteristic curves (KL1, KL2), transmits control signals to the associated control element (24) that generates counterpressures corresponding to predetermined counterpressure set values, senses the working pressure (p) corresponding to the displaced volume (V) on the torque characteristic curve (KL1, KL2) when the regulating valves respond, converts said working pressure (p) into a control signal and transmits said signal to the control element that generates a counterpressure.
Abstract:
The invention relates to a thick matter pump comprising a transport capacity control system. Said thick matter pump comprises a driving motor (50) which is preferably embodied as an internal combustion engine, a hydraulic pump (6) which is preferably embodied as a reversible pump, has a variable displacement volume (V) and can be coupled to the driving motor, and two hydraulic cylinders (5, 5') which are connected to the hydraulic pump (6), can be controlled by the same in a push-pull manner, and are each coupled to a transport cylinder (7, 7') for transporting the thick matter. A regulator for regulating the rotational speed (N) is associated with the driving motor (50), and a regulating element (18, 20) for regulating the displacement volume (V) is associated with the hydraulic pump (6). A control unit (54) is also provided for regulating the rotational speed (N) of the motor and the displacement volume (V). According to the invention, said control unit (54) comprises a regulating body (56) for regulating the thick matter transport capacity (F) of the transport cylinders (7, 7'), and an electronic control system (108) which reacts to the position of the regulating body (56) and allocates a nominal value to the rotational speed regulator and to the displacement volume actuator (20), in a software-assisted manner. These measures enable the operational comfort of the thick matter pump to be improved, and the fuel requirements, noise emission and waste gas emission to be reduced during practical use.
Abstract:
The invention relates to a hydraulic assembly comprising a variable electric motor and a hydrostatic variable displacement pump which can be coupled thereto and the pivoting angle of which can be adjusted by means of a hydromechanical adjustment device, the pivoting angle being detectible by means of a pivoting angle sensor and a working pressure of the variable displacement pump being detectible by means of a pressure sensor. A speed of the electric motor can be varied depending on the pivoting angle sensor and the pressure sensor.
Abstract:
Engin de travaux publics du type chargeur-excavateur, comportant un circuit hydraulique (1) alimentant un ou plusieurs actionneurs hydrauliques, ledit circuit hydraulique étant équipé d'une pompe (4) à débit variable, apte à fonctionner selon deux modes distincts, à savoir un mode dit de "pleine puissance" dédié au fonctionnement en excavateur, et un mode dit de "puissance réduite" dédié au fonctionnement en chargeur, caractérisé , en ce qu'il comporte également un capteur de température (20) permettant de déterminer la température de l'huile circulant dans le circuit hydraulique (1), et des moyens pour faire basculer automatiquement le fonctionnement de la pompe (4) du mode de "pleine puissance" vers le mode de "puissance réduite", lorsque la température de l'huile dépasse un seuil prédéterminé.
Abstract:
Die Erfindung bezieht sich auf eine Dickstoffpumpe mit Fördermengensteuerung. Die Dickstoffpumpe weist einen vorzugsweise als Verbrennungsmotor ausgebildeten Antriebsmotor (50), eine mit dem Antriebsmotor kuppelbare, vorzugsweise als Reversierpumpe ausgebildete Hydropumpe (6) mit variablem Verdrängungsvolumen (V), und zwei an die Hydropumpe (6) angeschlossene, über diese im Gegentakt ansteuerbare und mit je einem Förderzylinder (7, 7') für die Dickstoffe gekoppelte Hydrozylinder (5, 5') auf. Dem Antriebsmotor (50) ist ein Regler zur Einstellung der Drehzahl (N) zugeordnet, während der Hydropumpe (6) ein Stellglied (18, 20) zur Einstellung des Verdrängungsvolumens (V) zugeordnet ist. Weiter ist eine Steuereinheit (54) zur Einstellung der Motordrehzahl (N) und des Verdrängungsvolumens (V) vorgesehen. Erfindungsgemäß weist die Steuereinheit (54) ein Einstellorgan (56) zur Einstellung der Dickstoff-Fördermenge (F) der Förderzylinder (7, 7') sowie eine auf die Stellung des Einstellorgans (56) ansprechende Steuerelektronik (108) zur softwaregestützten Sollwertvorgabe für den Drehzahlregler und für das Verdrängungsvolumen-Stellglied (20) auf. Mit diesen Maßnahmen wird erreicht, dass der Bedienungskomfort der Dickstoffpumpe verbessert und der Kraftstoffbedarf sowie die Schall- und Abgasemission im praktischen Einsatz reduziert werden.
Abstract:
An apparatus (10) for regulating the speed of internal combustion engine (16) of a hydrostatic system. A fuel control means (34) acts to control the quantity of fuel delivered to the engine (16) responsive to the immediate hydraulic flow demanded by operation of the hydrostatic system. The speed of the engine (16) is set to one of a plurality of discrete levels in response to the required flow being within one of a corresponding plurality of preselected ranges.