摘要:
The invention relates to a hydraulic arrangement (1, 49) for generating a series (35) of periodic fluid pressure pulses (36). The hydraulic arrangement (1, 49) comprises a synthetically commutated hydraulic pump (4), a fluid output connector (3) for an external device (2), a fluid conduit (9, 10) connecting said synthetically commutated hydraulic pump (4) and said fluid output connector (3), a triggerable orifice device arrangement (22) connected to said fluid conduit (9, 10), at least a pressure transducer (18, 33) being fluidly connected to said fluid conduit (9, 10), and a control device (6) for controlling said hydraulic arrangement (1).
摘要:
A hydraulic transmission comprising a variable displacement pump and motor, at least one of which has cylinders having valves which are controllable on each cycle of cylinder working volume to determine the net displacement of working fluid by the cylinder. The transmission has a controller which determines a displacement of the pump and the motor. The displacement of the pump and/or motor is controlled to attenuate oscillations in parameters such as the pump torque or the pressure in the high pressure working fluid line connecting the pump to the motor. A demand signal, such as a torque demand signal is processed taking into account a damping signal which is calculated to compensate for variations in the amplitude and phase of the response of the net displacement by said cylinders to the received demand signal with the frequency of the one or more oscillations and the speed of rotation of the rotatable shaft of the pump or motor respectively.
摘要:
Die Erfindung betrifft ein hydrostatisches Antriebssystem (1) mit einer Speisepumpe (25) zur Versorgung eines Speisedruckkreises (S). Zur Lösung der Aufgabe, bei einem derartigen Antriebssystem mit geringem Bauaufwand und mit geringer Verlustleistung einen konstanten Speisedruck des Speisedruckkreises zu erzeugen, erfindungsgemäß vorgeschlagen, dass die Speisepumpe (25) als hubkonstante und sauggedrosselte Kolbenpumpe (40) ausgebildet ist, die im offenen Kreislauf betrieben ist und aus einem Behälter (10) Druckmittel ansaugt und in eine Förderleitung (27) fördert.
摘要:
The invention relates to a multi-piston pump (1) as a recirculating pump of a slip-regulated hydraulic vehicle brake system. The invention proposes to connect a hydraulic accumulator (11) having a bias to a pump element (3) of the multi-piston pump (1). The hydraulic accumulator (11) limits the maximum delivery pressure of the pump elements (3) and thereby reduces a starting torque of the multi-piston pump (1) at a high counter-pressure in the exhaust (10).
摘要:
A method of operating a hydraulic motor including: a rotor shaft; a cylinder; a piston forming a working chamber together with the cylinder; and at least one high-pressure valve and at least one low-pressure valve configured to switch a communication state between the working chamber and a high-pressure line and between the working chamber and a low-pressure line, respectively, in connection with reciprocating motion of the piston, includes: a step of detecting an abnormality of the hydraulic motor; and a stop step of stopping the hydraulic motor if the abnormality is detected. The stop step includes: maintaining a pressure of the high-pressure line to be within a predetermined range of not greater than an upper limit value Pmax which is smaller than a rated pressure of the high-pressure line and not less than a lower limit value Pmin which is greater than zero at least until a rotation speed of the rotor shaft decreases to a predetermined rotation speed which is lower than a rated rotation speed.
摘要:
The present invention provides a hydraulic pump (10) for use in driving a load (54) with a control modulation system (9) which modulates a primary control signal in order to accommodate variations in secondary changeable parameters which require control at a higher frequency or have a lower latency.
摘要:
The invention concerns a radial piston pump with a multiplicity of radially disposed cylinder/pump assemblies with foot and head valves, the pistons being controlled by a cam plate which rotates eccentrically with respect to a housing holding the cylinders. In order to produce a simple design for a pump of this kind and to permit digital pump-throughput control, the invention calls for the space between the ends (12) of the cylinders (9) and their associated pistons (7) to be connected to a pressure line (19) via a valve (21, 22) which can be controlled at will, the pump pistons (7) preferably having different diameters.
摘要:
Pompe à pistons radiaux comportant un grand nombre de dispositifs à pistons placés dans le sens radial, avec des soupapes d'admission et de refoulement, et dont les pistons sont commandés par un disque d'excentrique qui décrit un mouvement de rotation excentrique par rapport à un carter contenant les cylindres. Pour que cette pompe à pistons radiaux réponde à un critère de simplicité de construction et pour assurer une commande numérique de la pompe en vue de la régulation du refoulement, il est prévu que l'espace séparant les faces frontales (12) des cylindres (9) et les pistons (7) correspondants soit relié à une conduite de refoulement (19) de la pompe au moyen d'une vanne à commande volontaire (21, 22) et que les pistons (7) des pompes présentent, de préférence, des diamètres différents.
摘要:
Vorzugsweise zur Steuerung der Ventile von Verbrennungskraftmaschinen wird eine Rotationskolbenpumpe vorgeschlagen, die durch Exzenter (2) hin und her bewegte Kolben (4) aufweist, die Hydraulikfluid abwechselnd in einen Kanal (7) fördern bzw. aus diesem ansaugen. Entsprechend wird in einem über eine Leitung (9) mit der Pumpe verbundenen Stellzylinder (13) ein ein Teil eines Ventils (14) bildender Kolben hin und her bewegt, so daß sich das Ventil öffnet bzw. schließt. Während eines Teils des Umlaufes geben in einem Drehschieber (10) angelegte Ausnehmungen (11) weitere Auslässe (8) der Kanäle (7) frei, so daß die Pumpwirkung nur innerhalb des Pumpengehäuses (5) stattfindet, keine Wirkung auf den Stellzylinder (13) ausgeübt wird und das Ventil (14) entsprechend seiner gewünschten Charakteristik für einen bestimmten Zeitraum geschlossen bleibt. Durch Längsverschieben des Drehschiebers (10) kann die Charakteristik der Ausnehmungen (11) geändert werden, und damit auch die Öffnungs- bzw. Schließdauer der Ventile (14).
摘要:
A variable fluid flow hydraulic pump including one or more displacement bodies 2 having a fixed volume chamber 3. Within this fixed volume chamber 3 a piston 4 cycles or reciprocates thus providing for the movement of fluid. Also present is a low pressure valve 9 connecting said displacement chamber with the low pressure side 5.Also present in embodiments of the present invention on the high pressure side 7 is a high pressure valve 6. The low pressure valve 9 is provided with adjustable means10 or Fcontrol providing an opening force thereon and further providing a closing force, which periodically increases during the pumping stroke and decreases during the suction stroke of said piston 4 reciprocating within the displacement body 3 and further comprises means to supply fluid from the low pressure side 5 to said fixed volume chamber 3 of the displacement body 3 while the pressure in the displacement chamber 3 is less than that of the low pressure side 5.