EP0402871B1 - Control device for variable displacement pump - Google Patents

Control device for variable displacement pump Download PDF

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Publication number
EP0402871B1
EP0402871B1 EP90111124A EP90111124A EP0402871B1 EP 0402871 B1 EP0402871 B1 EP 0402871B1 EP 90111124 A EP90111124 A EP 90111124A EP 90111124 A EP90111124 A EP 90111124A EP 0402871 B1 EP0402871 B1 EP 0402871B1
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EP
European Patent Office
Prior art keywords
slide
control
pressure
regulation
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP90111124A
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German (de)
French (fr)
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EP0402871A3 (en
EP0402871A2 (en
Inventor
Werner Dipl.-Ing. Hörmann
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Brueninghaus Hydromatik GmbH
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Brueninghaus Hydromatik GmbH
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Publication of EP0402871A3 publication Critical patent/EP0402871A3/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26Control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08Regulating by delivery pressure

Definitions

  • the invention relates to a control device according to the preamble of claim 1.
  • Such a control device with a control valve, in which a power controller and a pressure controller are integrated, is known for example from DE-OS 19 11 695 and described below with reference to the exemplary basic circuit shown in FIG. 1, the power and pressure controllers being simplified Representation are drawn separately from each other.
  • the control device generally designated 1, comprises a control valve 10 with a power controller 2 and a pressure controller 3 superimposed by the latter, both of which regulate the hydraulic action on an adjusting cylinder 4, which is part of an adjusting device 5 for a pump 6 used in an open circuit.
  • the pump 6 driven by a drive shaft 7 sucks through a suction line 8 from a tank 9 and delivers into a working line 11.
  • a leak line 12 leading from the pump 6 to the tank 9 is shown with broken lines.
  • the power valve 13 of the power regulator 2 and the pressure limiting valve 14 of the pressure regulator 3 are arranged in a parallel arrangement in a line connecting the working line 11 to the adjusting cylinder 4.
  • the working spaces 16, 21 present on both sides of the piston 15 of the adjusting cylinder 4 can be acted upon.
  • the piston annulus 16 is connected to the working line 11 by a hydraulic line 17. Extends from the piston annulus 16 Line section 18 to the power valve 13.
  • the line extension 19 which follows the power valve 13 extends to the piston chamber 21 of the adjusting cylinder 4.
  • a branch line 23 leading to the tank 9 branches off from the line extension 19 and contains a throttle 24, the function of which is still described becomes.
  • the pressure relief valve 14 is located in a parallel line 25 branching off from the line section 18.
  • the valve spool 26 of the pressure relief valve 14 can be acted upon by the working pressure through a line section 27 and is adjustable against a spring 28 of variable spring force.
  • the line section 27 branches off from the parallel line 25 or the line section 18 and
  • the valve slide 29 of the power valve 13 is adjustable depending on the delivery rate setting of the pump 6 and depending on the working pressure against springs 31 and 31.1, possibly variable spring force.
  • an angle lever 32 mounted on its apex, one lever arm adjusts the valve slide 29 and the other lever arm is adjusted by a hydraulic piston 33, which is displaceably mounted in the transverse arrangement in the piston rod 34 of the adjusting cylinder 4 and by a connecting line 35 extending in the piston rod 34 from the piston ring space 16 to the piston 33 can be acted upon by the working pressure.
  • control device 1 The function of the control device 1 is as follows. The arrangement shown shows the depressurized state. If a consumer in the working line 11 causes an increasing working pressure A, the valve spool 29 of the power valve 13 is displaced to the left by the piston 33 and the angle lever 32 in FIG. 1, the valve spool 29 at the first passage denoted by 41 a control pressure R im Line extension 19 sets with increasing Working pressure A increases and displaces the piston 15 for the purpose of reducing the setting of the delivery volume of the pump 6, in the present exemplary embodiment pushes out.
  • the pressure regulator 3 comes into operation, which adjusts a control pressure R 1 at the second passage designated 42 in the pressure relief valve 14, which adjusts itself in a line section 36 connecting the pressure relief valve 14 to the power valve 13 and over reproduces a third passage 43 in the power valve 13 in the line extension 19 and thus in the piston chamber 21 and adjusts the pump 6 so that the working pressure A does not increase any further.
  • the piston 15 is pushed back, here pushed in, the amount of liquid displaced from the piston chamber 21 through the second passage 43 and a fourth passage 45 in the pressure limiting valve 14 connecting the line section 36 to a drain line 44 leading to the tank 9 can flow to the tank 9.
  • the power valve 13 and the pressure relief valve 14 are each formed by a 3/2-way proportional valve.
  • the invention has for its object to design a control device of the type mentioned in such a way that the flow loss required for dynamic stability can be reduced.
  • the throttled drain line ensuring the dynamic stability of the pressure regulator is controlled as a function of the function of the pressure regulator, wherein it is opened or comes into operation when the pressure regulator responds.
  • the leakage flow is thus limited to the control range of the pressure regulator, whereby a significant increase in performance is achieved because in the control range of the power regulator, the throttled drain line is inoperative and the power loss caused by the loss flow is therefore eliminated.
  • the control device uses a throttled drain line arranged in its control valve 51, which is designed in the form of a bypass 92, 89, 93 with a throttle 47.
  • the throttled bypass 92, 89, 93 of the control valve 51 according to the invention is in the latter Capacity control area closed and only functional in its pressure control area.
  • the control valve 51 comprises a valve spool 52 and a control spool 73.
  • the former corresponds to the valve spool 29 and the latter to the valve spool 26 of the known control valve 10.
  • the valve spool 52 is sleeve-shaped and is axially displaceably mounted in a housing wall 53 of the pump housing 54 and is accessible from the outside in the narrower section 55 of a stepped bore 56, the larger step of which is designated 57 and has an internal thread, into which a closure cap 58 with an adjusting device 59 for the basic setting of the control valve 51 is screwed.
  • the narrower section 55 of the stepped bore 56 cuts 53 channels in the housing wall, of which the channel labeled 61 corresponds to the line 18 according to FIG. 1 and thus contains the working pressure A.
  • the middle channel 62 corresponds to the line 19 in FIG. 1, which contains the regulating pressure R with which the piston chamber 21 of the adjusting cylinder 4 is acted upon.
  • the channel 63 arranged to the right of the channel 62 in FIGS. 2 and 3 corresponds to the drain line 44 leading to the tank according to FIG. 1.
  • the channel 61 is connected to a circumferential groove 65 on the valve slide 52, the right boundary edge of which forms a control edge 66 which interacts with a counter-control edge 67 formed by the wall of the channel 62.
  • the control edge 66 is at the same time the left boundary edge of a circumferential web 68 formed on the valve slide 52, the right boundary edge of which forms a further control edge 69 which is the left shoulder of a second initial groove 71 of the valve slide 52, which is connected to the channel 63.
  • the control edges 66, 69 interact with the mutually opposite peripheral sections 67 of the channel 62.
  • the valve slide 52 has an axial guide bore 72, in which the control slide 73 is axially displaceably mounted. At its left end in FIGS. 2 and 3, the control slide 73 has an axial blind bore from which a pressure pin 74 protrudes and is connected to the one lever arm 75 of the angle lever 76, which is pivotably mounted about an axis of rotation 77 extending transversely to the valve slide 52 .
  • the other rebel arm 78 of the angle lever 76 is acted upon by an adjustable compression spring 79 against an actuator in the form of a hydraulic piston 81, which corresponds to the piston 33 according to FIG.
  • the circumferential groove 65 is connected by a radial channel 82 to a circumferential groove 84 in the control slide 73, which is delimited on its right side by an annular shoulder 85 of the control slide 73.
  • a hydraulic working chamber 86 which is delimited on the right side by a guide section 87 which guides a narrowed guide part 88 of the control slide 73 in a sliding guide.
  • a circumferential groove 89 is formed, the left shoulder of which forms a control edge 91 which can close or open one or more ring and / or radial channels 92 in the valve slide 52 in the region of the circumferential web 68, in which throttles can be arranged, and which communicate with the circumferential groove 89 in the open position.
  • the radial channel 93 with the throttle 47 is arranged, which connects the circumferential groove 71 with the circumferential groove 89 of the valve slide 52.
  • the annular shoulder 85 is a circumferential groove 84 with the Throttle point 80 connecting working chamber 86 is provided, which is formed here by a flattening.
  • a delivery rate control is implemented in which the control or regulating pressure R is increased as the working pressure A increases.
  • the size of the working surface of the working annular chamber 86 is so dimensioned or matched to the existing arrangement that in the power control range of the control valve 51 the angle lever 76 and the set force of the compression spring 79 are the hydraulic thrust forces which move the control slide 73 relative to the valve slide 52 to the left tries to push, press over so that the control slide 73 assumes the right end position or rest position shown in FIG. 2, in which the control slide 73 rests against the bottom 72.1 of the guide bore 72.
  • the control slide 73 presses the angle lever 76, the control slide 73 being moved relative to the valve slide 52 to the left into the control position shown in FIG. 3, in which the control edge 91 controls the radial channels 92 at least partially opens and the bypass 46 formed by the radial channels 92, the circumferential groove 89 and the radial channel 93 and the throttle 47 is opened and thus a small amount of the hydraulic medium can flow away, whereby the desired dynamic stability of the control valve 51 is achieved.
  • the adjusting device 59 and also an adjusting device, generally designated 94, for the force of the compression spring 79 is designed in a manner known per se with adjusting screws which act against spring plates and adjust different spring forces by longitudinal adjustment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Description

Die Erfindung bezieht sich auf eine Regeleinrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a control device according to the preamble of claim 1.

Eine derartige Regeleinrichtung mit einem Regelventil, in dem ein Leistungsregler und ein Druckregler integriert sind, ist beispielsweise aus der DE-OS 19 11 695 bekannt und nachstehend anhand der in Fig. 1 dargestellten exemplarischen Prinzipschaltung beschrieben, wobei der Leistungs- und der Druckregler der vereinfachten Darstellung wegen getrennt voneinander gezeichnet sind.Such a control device with a control valve, in which a power controller and a pressure controller are integrated, is known for example from DE-OS 19 11 695 and described below with reference to the exemplary basic circuit shown in FIG. 1, the power and pressure controllers being simplified Representation are drawn separately from each other.

Die allgemein mit 1 bezeichnete Regeleinrichtung umfaßt ein Regelventil 10 mit einem Leistungsregler 2 und einem von letzterem überlagerten Druckregler 3, die beide die hydraulische Beaufschlagung eines Verstellzylinders 4 regeln, der Teil einer Verstelleinrichtung 5 für eine im offenen Kreislauf eingesetzte Pumpe 6 ist. Die durch eine Antriebswelle 7 angetriebene Pumpe 6 saugt durch eine Saugleitung 8 aus einem Tank 9 und fördert in eine Arbeitsleitung 11. Mit gestrichelten Linien ist eine von der Pumpe 6 zum Tank 9 führende Leckleitung 12 dargestellt.The control device, generally designated 1, comprises a control valve 10 with a power controller 2 and a pressure controller 3 superimposed by the latter, both of which regulate the hydraulic action on an adjusting cylinder 4, which is part of an adjusting device 5 for a pump 6 used in an open circuit. The pump 6 driven by a drive shaft 7 sucks through a suction line 8 from a tank 9 and delivers into a working line 11. A leak line 12 leading from the pump 6 to the tank 9 is shown with broken lines.

Das Leistungsventil 13 des Leistungsreglers 2 und das Druckbegrenzungsventil 14 des Druckreglers 3 sind in Parallelanordnung in einer die Arbeitsleitung 11 mit dem Verstellzylinder 4 verbindenden Leitung angeordnet. Beim vorliegenden Ausführungsbeispiel sind die beidseitig des Kolbens 15 des Verstellzylinders 4 vorhandenen Arbeitsräume 16,21 beaufschlagbar. Der Kolbenringraum 16 ist durch eine hydraulische Leitung 17 mit der Arbeitsleitung 11 verbunden. Vom Kolbenringraum 16 erstreckt sich ein Leitungsabschnitt 18 bis zum Leistungsventil 13. Der sich hinter dem Leistungsventil 13 anschließende Leitungsfortsatz 19 erstreckt sich zum Kolbenraum 21 des Verstellzylinder 4. Vom Leitungsfortsatz 19 zweigt eine zum Tank 9 führende Ablaufleitung 23 ab, in der eine Drossel 24 angeordnet ist, deren Funktion noch beschrieben wird. Das Druckbegrenzungsventil 14 befindet sich in einer vom Leitungsabschnitt 18 abzweigenden Parallelleitung 25. Der Ventilschieber 26 des Druckbegrenzungsventils 14 ist durch einen Leitungsabschnitt 27 mit dem Arbeitsdruck beaufschlagbar und gegen eine Feder 28 veränderlicher Federkraft verstellbar. Der Leitungsabschnitt 27 zweigt von der Parallelleitung 25 oder dem Leitungsabschnitt 18 ab und weist eine Drossel 20 auf.The power valve 13 of the power regulator 2 and the pressure limiting valve 14 of the pressure regulator 3 are arranged in a parallel arrangement in a line connecting the working line 11 to the adjusting cylinder 4. In the present exemplary embodiment, the working spaces 16, 21 present on both sides of the piston 15 of the adjusting cylinder 4 can be acted upon. The piston annulus 16 is connected to the working line 11 by a hydraulic line 17. Extends from the piston annulus 16 Line section 18 to the power valve 13. The line extension 19 which follows the power valve 13 extends to the piston chamber 21 of the adjusting cylinder 4. A branch line 23 leading to the tank 9 branches off from the line extension 19 and contains a throttle 24, the function of which is still described becomes. The pressure relief valve 14 is located in a parallel line 25 branching off from the line section 18. The valve spool 26 of the pressure relief valve 14 can be acted upon by the working pressure through a line section 27 and is adjustable against a spring 28 of variable spring force. The line section 27 branches off from the parallel line 25 or the line section 18 and has a throttle 20.

Der Ventilschieber 29 des Leistungsventils 13 wird in Abhängigkeit von der Fördermengeneinstellung der Pumpe 6 und in Abhängigkeit vom Arbeitsdruck gegen Federn 31 und 31.1 gegebenenfalls veränderlicher Federkraft verstellbar. Hierzu dient in an sich bekannter Weise ein an seinem Scheitel gelagerter Winkelhebel 32, dessen einer Hebelarm den Ventilschieber 29 verstellt und dessen anderer Hebelarm von einem hydraulischen Kolben 33 verstellt wird, der in Queranordnung in der Kolbenstange 34 des Verstellzylinders 4 verschiebbar gelagert ist und durch eine sich in der Kolbenstange 34 vom Kolbenringraum 16 zum Kolben 33 erstreckende Verbindungsleitung 35 mit dem Arbeitsdruck beaufschlagbar ist.The valve slide 29 of the power valve 13 is adjustable depending on the delivery rate setting of the pump 6 and depending on the working pressure against springs 31 and 31.1, possibly variable spring force. For this purpose, in a manner known per se, an angle lever 32 mounted on its apex, one lever arm adjusts the valve slide 29 and the other lever arm is adjusted by a hydraulic piston 33, which is displaceably mounted in the transverse arrangement in the piston rod 34 of the adjusting cylinder 4 and by a connecting line 35 extending in the piston rod 34 from the piston ring space 16 to the piston 33 can be acted upon by the working pressure.

Die Funktion der Regeleinrichtung 1 ist folgende. Die dargestellte Anordnung zeigt den drucklosen Zustand. Wenn ein Verbraucher in der Arbeitsleitung 11 einen ansteigenden Arbeitsdruck A verursacht, wird der Ventilschieber 29 des Leistungsventils 13 durch den Kolben 33 und den Winkelhebel 32 in Fig. 1 nach links verschoben, wobei der Ventilschieber 29 am mit 41 bezeichneten ersten Durchgang einen Regeldruck R im Leitungsfortsatz 19 einstellt, der mit zunehmendem Arbeitsdruck A zunimmt und den Kolben 15 zwecks verringerter Einstellung des Fördervolumens der Pumpe 6 verschiebt, beim vorliegenden Ausführungsbeispiel ausschiebt.The function of the control device 1 is as follows. The arrangement shown shows the depressurized state. If a consumer in the working line 11 causes an increasing working pressure A, the valve spool 29 of the power valve 13 is displaced to the left by the piston 33 and the angle lever 32 in FIG. 1, the valve spool 29 at the first passage denoted by 41 a control pressure R im Line extension 19 sets with increasing Working pressure A increases and displaces the piston 15 for the purpose of reducing the setting of the delivery volume of the pump 6, in the present exemplary embodiment pushes out.

Wenn der Arbeitsdruck A einen vorbestimmten maximalen Wert erreicht, tritt der Druckregler 3 in Funktion, der am mit 42 bezeichneten zweiten Durchgang im Druckbegrenzungsventil 14 einen Regeldruck R₁ einstellt, der sich in einem das Druckbegrenzungsventil 14 mit dem Leistungsventil 13 verbindenen Leitungsabschnitt 36 einstellt und sich über einen dritten Durchgang 43 im Leistungsventil 13 in den Leitungsfortsatz 19 und somit in den Kolbenraum 21 fortpflanzt und die Pumpe 6 so verstellt, daß der Arbeitsdruck A nicht weiter ansteigt. Wenn der Arbeitsdruck A im Regelbereich sinkt, wird der Kolben 15 zurückgeschoben, hier eingeschoben, wobei die aus dem Kolbenraum 21 verdrängte Flüssigkeitsmenge durch den zweiten Durchgang 43 und einen den Leitungsabschnitt 36 mit einer zum Tank 9 führenden Ablaufleitung 44 verbindenen vierten Durchgang 45 im Druckbegrenzungsventil 14 zum Tank 9 abfließen kann.When the working pressure A reaches a predetermined maximum value, the pressure regulator 3 comes into operation, which adjusts a control pressure R 1 at the second passage designated 42 in the pressure relief valve 14, which adjusts itself in a line section 36 connecting the pressure relief valve 14 to the power valve 13 and over reproduces a third passage 43 in the power valve 13 in the line extension 19 and thus in the piston chamber 21 and adjusts the pump 6 so that the working pressure A does not increase any further. When the working pressure A drops in the control range, the piston 15 is pushed back, here pushed in, the amount of liquid displaced from the piston chamber 21 through the second passage 43 and a fourth passage 45 in the pressure limiting valve 14 connecting the line section 36 to a drain line 44 leading to the tank 9 can flow to the tank 9.

Das Leistungsventil 13 und das Druckbegrenzungsventil 14 sind jeweils durch ein 3/2-Proportionalwegeventil gebildet.The power valve 13 and the pressure relief valve 14 are each formed by a 3/2-way proportional valve.

Es ist der Zweck der mittels der Drossel 24 gedrosselten Ablaufleitung 23, eine geringe Strömung und somit die dynamische Stabilität des Druckreglers 3 zu gewährleisten. Diesem Vorteil steht jedoch ein Leistungsverlust aufgrund der Verlustströmung an der Drossel 24 entgegen. Dieser Strömungs- bzw. Leistungsverlust ist beträchtlich, da er im gesamten Regelbereich der Regeleinrichtung 1 stattfindet.It is the purpose of the discharge line 23 throttled by means of the throttle 24 to ensure a low flow and thus the dynamic stability of the pressure regulator 3. However, this advantage is countered by a loss of power due to the loss of flow at the throttle 24. This flow or power loss is considerable since it takes place in the entire control range of the control device 1.

Der Erfindung liegt die Aufgabe zugrunde, eine Regeleinrichtung der eingangs bezeichneten Art so auszugestalten, daß der für eine dynamische Stabilität erforderliche Strömungsverlust verringert werden kann.The invention has for its object to design a control device of the type mentioned in such a way that the flow loss required for dynamic stability can be reduced.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved by the characterizing features of claim 1.

Bei der erfindungsgemäßen Ausgestaltung ist die die dynamische Stabilität des Druckreglers gewährleistende gedrosselte Ablaufleitung in Abhängigkeit von der Funktion des Druckreglers gesteuert, wobei sie geöffnet wird oder in Funktion tritt, wenn der Druckregler anspricht. Die Verlustströmung ist somit auf den Regelbereich des Druckreglers begrenzt, wodurch eine erhebliche Leistungssteigerung erzielt wird, weil im Regelbereich des Leistungsreglers die gedrosselte Ablauf leitung außer Funktion ist und somit der durch die Verlustströmung hervorgerufene Leistungsverlust entfällt.In the embodiment according to the invention, the throttled drain line ensuring the dynamic stability of the pressure regulator is controlled as a function of the function of the pressure regulator, wherein it is opened or comes into operation when the pressure regulator responds. The leakage flow is thus limited to the control range of the pressure regulator, whereby a significant increase in performance is achieved because in the control range of the power regulator, the throttled drain line is inoperative and the power loss caused by the loss flow is therefore eliminated.

Nachfolgend ist die Erfindung anhand eines in der Zeichnung dargestellten bevorzugten Ausführungsbeispiels näher erläutert. Es zeigen

Fig. 2
einen Längsschnitt des Regelventils des Ausführungsbeispiels der erfindungsgemäßen Regeleinrichtung in der Funktionsstellung Leistungsregelung und
Fig. 3
einen Längsschnitt des Regelventils nach Fig. 2 in der Funktionsstellung Druckregelung.
The invention is explained in more detail below on the basis of a preferred exemplary embodiment shown in the drawing. Show it
Fig. 2
a longitudinal section of the control valve of the embodiment of the control device according to the invention in the power control function position and
Fig. 3
a longitudinal section of the control valve of FIG. 2 in the pressure control function position.

Statt der dem Regelventil 10 der bekannten Regeleinrichtung nachgeschalteten gedrosselten Ablaufleitung 23 verwendet die erfindungsgemäße Regeleinrichtung eine in ihrem Regelventil 51 angeordnete gedrosselte Ablaufleitung, die in Form eines Beipasses 92,89,93 mit einer Drossel 47 ausgebildet ist. Im Gegensatz zu der im gesamten Funktionsbereich des bekannten Regelventils in Funktion befindlichen Ablaufleitung 23 ist der gedrosselte Beipass 92,89,93 des erfindungsgemäßen Regelventils 51 in dessen Leistungsregelungsbereich geschlossen und lediglich in dessen Druckregelungsbereich funktionsfähig.Instead of the throttled drain line 23 downstream of the control valve 10 of the known control device, the control device according to the invention uses a throttled drain line arranged in its control valve 51, which is designed in the form of a bypass 92, 89, 93 with a throttle 47. In contrast to the discharge line 23 which is in operation in the entire functional range of the known control valve, the throttled bypass 92, 89, 93 of the control valve 51 according to the invention is in the latter Capacity control area closed and only functional in its pressure control area.

Das Regelventil 51 umfaßt einen Ventilschieber 52 und einen Steuerschieber 73. Ersterer entspricht dem Ventilschieber 29 und letzterer dem Ventilschieber 26 des bekannten Regelventils 10. Der Ventilschieber 52 ist hülsenförmig ausgebildet und axial verschiebbar in einer Gehäusewand 53 des Pumpengehäuses 54 gelagert ist und zwar von außen zugänglich in dem engeren Abschnitt 55 einer Stufenbohrung 56, deren größere Stufe mit 57 bezeichnet ist und ein Innengewinde aufweist, in das eine Verschlußkappe 58 mit einer Einstellvorrichtung 59 für die Basis-Einstellung des Regelventils 51 eingeschraubt ist.The control valve 51 comprises a valve spool 52 and a control spool 73. The former corresponds to the valve spool 29 and the latter to the valve spool 26 of the known control valve 10. The valve spool 52 is sleeve-shaped and is axially displaceably mounted in a housing wall 53 of the pump housing 54 and is accessible from the outside in the narrower section 55 of a stepped bore 56, the larger step of which is designated 57 and has an internal thread, into which a closure cap 58 with an adjusting device 59 for the basic setting of the control valve 51 is screwed.

Der engere Abschnitt 55 der Stufenbohrung 56 schneidet in der Gehäusewand 53 Kanäle, von denen der mit 61 bezeichnete Kanal der Leitung 18 gemäß Fig. 1 entspricht und somit den Arbeitsdruck A enthält. Der mittlere Kanal 62 entspricht der Leitung 19 in Fig. 1, die den Regeldruck R enthält, mit dem der Kolbenraum 21 des Verstellzylinders 4 beaufschlagt ist. Der in Fig. 2 und 3 rechts vom Kanal 62 angeordnete Kanal 63 entspricht der zum Tank führenden Ablaufleitung 44 gemäß Fig. 1. Außerdem ist noch ein Kanal 64 rechts von den vorgenannten Kanälen vorhanden, der im wesentlichen drucklos ist und ebenfalls zum Tank führt. Der Kanal 61 steht in Verbindung mit einer Umfangsnut 65 am Ventilschieber 52, deren rechte Begrenzungskante eine Steuerkante 66 bildet, die mit einer durch die Wandung des Kanals 62 gebildete Gegensteuerkante 67 zusammenwirkt. Die Steuerkante 66 ist zugleich linke Begrenzungskante eines am Ventilschieber 52 ausgebildeten Umfangssteges 68, dessen rechte Begrenzungskante eine weitere Steuerkante 69 bildet, die die linke Schulter einer zweiten amfangsnut 71 des Ventilschiebers 52 ist, die mit dem Kanal 63 in Verbindung steht. Die Steuerkanten 66, 69 wirken mit den einander gegenüberliegenden Umfangsabschnitten 67 des Kanals 62 zusammen.The narrower section 55 of the stepped bore 56 cuts 53 channels in the housing wall, of which the channel labeled 61 corresponds to the line 18 according to FIG. 1 and thus contains the working pressure A. The middle channel 62 corresponds to the line 19 in FIG. 1, which contains the regulating pressure R with which the piston chamber 21 of the adjusting cylinder 4 is acted upon. The channel 63 arranged to the right of the channel 62 in FIGS. 2 and 3 corresponds to the drain line 44 leading to the tank according to FIG. 1. In addition, there is also a channel 64 to the right of the aforementioned channels, which is essentially depressurized and also leads to the tank. The channel 61 is connected to a circumferential groove 65 on the valve slide 52, the right boundary edge of which forms a control edge 66 which interacts with a counter-control edge 67 formed by the wall of the channel 62. The control edge 66 is at the same time the left boundary edge of a circumferential web 68 formed on the valve slide 52, the right boundary edge of which forms a further control edge 69 which is the left shoulder of a second initial groove 71 of the valve slide 52, which is connected to the channel 63. The control edges 66, 69 interact with the mutually opposite peripheral sections 67 of the channel 62.

Der Ventilschieber 52 weist eine axiale Führungsbohrung 72 auf, in der der Steuerschieber 73 axial verschiebbar gelagert ist. An seinem in Fig. 2 und 3 linken Ende weist der Steuerschieber 73 eine axiale Sackbohrung aufs aus der ein Druckstift 74 herausragt und mit dem einem Hebelarm 75 des Winkelhebels 76 in Verbindung steht, der um eine quer zum Ventilschieber 52 verlaufende Drehachse 77 schwenkbar gelagert ist. Der andere Rebelarm 78 des Winkelhebels 76 wird durch eine einstellbare Druckfeder 79 gegen ein Stellglied in Form eines hydraulischen Kolbens 81 beaufschlagt, der dem Kolben 33 gemäß Fig. 1 entspricht und in der Kolbenstange 34 des Verstellzylinders 4 quer verschiebbar gelagert ist, so daß sich sein Abstand a bezüglich der Drehachse 77 mit steigendem Arbeitsdruck verringert und mit fallendem Arbeitsdruck vergrößert. Die Funktion einer solchen Leistungsregeleinrichtung ist an sich bekannt, so daß es keiner Beschreibung im einzelnen bedarf.The valve slide 52 has an axial guide bore 72, in which the control slide 73 is axially displaceably mounted. At its left end in FIGS. 2 and 3, the control slide 73 has an axial blind bore from which a pressure pin 74 protrudes and is connected to the one lever arm 75 of the angle lever 76, which is pivotably mounted about an axis of rotation 77 extending transversely to the valve slide 52 . The other rebel arm 78 of the angle lever 76 is acted upon by an adjustable compression spring 79 against an actuator in the form of a hydraulic piston 81, which corresponds to the piston 33 according to FIG. 1 and is mounted transversely displaceably in the piston rod 34 of the adjusting cylinder 4 so that it can be Distance a with respect to the axis of rotation 77 is reduced with increasing working pressure and increased with falling working pressure. The function of such a power control device is known per se, so that no detailed description is required.

Die Umfangsnut 65 steht durch einen Radialkanal 82 mit einer Umfangsnut 84 im Steuerschieber 73 in Verbindung, die an ihrer rechten Seite durch einen Ringansatz 85 des Steuerschiebers 73 begrenzt ist. Rechts vom Ringansatz 85 befindet sich eine hydraulische Arbeitskammer 86, die rechtsseitig durch einen Führungsabschnitt 87 begrenzt ist, der einen verengten Führungsteil 88 des Steuerschiebers 73 in einer Gleitführung führt. Im Führungsteil 88 ist eine Umfangsnut 89 ausgebildet, deren linke Schulter eine Steuerkante 91 bildet, die einen oder mehrere Ring- und/oder Radialkanäle 92 im Ventilschieber 52 im Bereich des Umfangssteges 68 durch Schließen oder zu öffnen vermag, in denen Drosseln angeordnet sein können, und die in der geöffneten Stellung mit der Umfangsnut 89 in Verbindung stehen. Im Ventilschieber 52 ist rechts neben den Radialkanälen 92 der Radialkanal 93 mit der Drossel 47 angeordnet, der die Umfangsnut 71 mit der Umfangsnut 89 des Ventilschiebers 52 verbindet. Im Ringansatz 85 ist eine die Umfangsnut 84 mit der Arbeitskammer 86 verbindende Drosselstelle 80 vorgesehen, die hier durch eine Abflachung gebildet ist.The circumferential groove 65 is connected by a radial channel 82 to a circumferential groove 84 in the control slide 73, which is delimited on its right side by an annular shoulder 85 of the control slide 73. To the right of the ring extension 85 is a hydraulic working chamber 86 which is delimited on the right side by a guide section 87 which guides a narrowed guide part 88 of the control slide 73 in a sliding guide. In the guide part 88, a circumferential groove 89 is formed, the left shoulder of which forms a control edge 91 which can close or open one or more ring and / or radial channels 92 in the valve slide 52 in the region of the circumferential web 68, in which throttles can be arranged, and which communicate with the circumferential groove 89 in the open position. In the valve slide 52 to the right of the radial channels 92, the radial channel 93 with the throttle 47 is arranged, which connects the circumferential groove 71 with the circumferential groove 89 of the valve slide 52. In the annular shoulder 85 is a circumferential groove 84 with the Throttle point 80 connecting working chamber 86 is provided, which is formed here by a flattening.

Beim vorliegenden Ausführungsbeispiel wird eine Fördermengensteuerung verwirklicht, bei der mit zunehmendem Arbeitsdruck A der Steuer- bzw. Regeldruck R vergrößert wird. Die Größe der Arbeitsfläche der Arbeits-Ringkammer 86 ist so bemessen bzw. auf die vorhandene Anordnung abgestimmt, daß im Leistungsregelbereich des Regelventils 51 der Winkelhebel 76 und die eingestellte Kraft der Druckfeder 79 die hydraulische Schubkraft, die den Steuerschieber 73 relativ zum Ventilschieber 52 nach links zu schieben sucht, überdrücken, so daß der Steuerschieber 73 die in Fig. 2 dargestellte rechte Endposition oder Ruhestellung einnimmt, in der der Steuerschieber 73 am Grund 72.1 der Führungsbohrung 72 anliegt. Wenn der Arbeitsdruck A beim Übergang vom Leistungsregelbereich zum Druckregelbereich seinen Maximaldruck erreicht, überdrückt der Steuerschieber 73 den Winkelhebel 76, wobei der Steuerschieber 73 relativ zum Ventilschieber 52 nach links in die in Fig. 3 dargestellte Regelstellung verschoben wird, in der die Steuerkante 91 die Radialkanäle 92 wenigstens teilweise öffnet und der durch die Radialkanäle 92, die Umfangsnut 89 und den Radialkanal 93 sowie die Drossel 47 gebildete Beipaß 46 geöffnet wird und somit eine geringe Menge des hydraulischen Mediums abfließen kann, wodurch die angestrebte dynamische Stabilit des Regelventils 51 erreicht wird.In the present exemplary embodiment, a delivery rate control is implemented in which the control or regulating pressure R is increased as the working pressure A increases. The size of the working surface of the working annular chamber 86 is so dimensioned or matched to the existing arrangement that in the power control range of the control valve 51 the angle lever 76 and the set force of the compression spring 79 are the hydraulic thrust forces which move the control slide 73 relative to the valve slide 52 to the left tries to push, press over so that the control slide 73 assumes the right end position or rest position shown in FIG. 2, in which the control slide 73 rests against the bottom 72.1 of the guide bore 72. When the working pressure A reaches its maximum pressure during the transition from the power control range to the pressure control range, the control slide 73 presses the angle lever 76, the control slide 73 being moved relative to the valve slide 52 to the left into the control position shown in FIG. 3, in which the control edge 91 controls the radial channels 92 at least partially opens and the bypass 46 formed by the radial channels 92, the circumferential groove 89 and the radial channel 93 and the throttle 47 is opened and thus a small amount of the hydraulic medium can flow away, whereby the desired dynamic stability of the control valve 51 is achieved.

Die Einstellvorrichtung 59 und auch eine allgemein mit 94 bezeichnete Einstellvorrichtung für die Kraft der Druckfeder 79 ist in an sich bekannter Art mit Stellschrauben ausgebildet, die gegen Federteller wirken und durch Längsverstellung unterschiedliche Federkräfte einstellen.The adjusting device 59 and also an adjusting device, generally designated 94, for the force of the compression spring 79 is designed in a manner known per se with adjusting screws which act against spring plates and adjust different spring forces by longitudinal adjustment.

Claims (11)

  1. Regulation device for an adjustable pump (6), with an hydraulic adjustment device (5) having an adjustment cylinder (4) and with a control valve (10; 51), into which there are integrated a power regulator (2; 52) for setting the delivery quantity and a pressure regulator (3; 73) for restricting the working pressure (A) at a particular upper limit, a throttled discharge line (23; 63) branching off from the line (19; 62) hydraulically acting upon the adjustment cylinder (4), which discharge line leads to a tank (9), characterized in that, the control slide (73) of the pressure regulator, upon its response, opens the throughflow passage of the throttled discharge line (92, 89, 93, 47).
  2. Regulation device according to claim 1,
    characterized in that,
    the power regulator is formed as a valve slide (52) and the pressure regulator is formed as a control slide (73) axially displaceable in the valve slide (52), in that the valve slide (52) is displaceably guided in a housing bore (55) - axially against a spring force - by means of a regulation member (76) which is adjustable in dependence upon the delivery quantity and the working pressure (A) of the pump (6), and the valve slide is divided into a high pressure section and a regulation pressure section by means of a control edge (66) which cooperates with a counter control edge (67) of the housing bore (55), for the purpose of generating the regulation pressure (R), in that the control slide (73) is held in a rest position by means of a force directed counter to the working pressure (A) and is displaceable by means of the working pressure (A) into a regulation disposition upon a maximum value of the working pressure being exceeded, in that in the regulation pressure section of the valve slide (52) at least one first radial channel (92) is formed and along with it at least one second radial channel (93) is formed which is connected to the tank (9) and has a throttle (47), and in that a control edge (91) of a circumferential groove (89) in the control slide (73) maintains the flow connection between the two radial channels (92, 93) interrupted in the rest position of the control slide, and opens the flow connection upon going to the regulation disposition.
  3. Regulation device according to claim 2,
    characterized in that,
    the valve slide (52) has a circumferential web (68) arranged between two circumferential grooves (65, 71), the web having the control edge (66) and a further control edge (69), in that the circumferential groove (65) is connected to the working pressure (A) and the circumferential groove (71) is connected to the tank (9), in that the first radial channel (92) is formed in the circumferential web (68), and in that the length of the circumferential groove (89) is greater than the axial spacing of the radial channels (92, 93).
  4. Regulation device according to claim 2 or 3,
    characterized in that,
    there is formed between the control slide (73) and the valve slide (52) a working chamber (86) having a working surface acted upon by the working pressure (A), effective in the direction towards the regulation member (76).
  5. Regulation device according to claim 4,
    characterized in that,
    the working chamber (86) is defined by means of a step in the guide bore (72) for the control slide (73), which bore is formed in the valve slide (52), and an opposing step on the control slide (73).
  6. Regulation device according to claim 4 or 5,
    characterized in that,
    the control slide (73) has a circumferential groove (84) in a section of larger diameter, which groove - via a radial channel (82) in the valve slide (52) - is in connection with its circumferential groove (65), and in that the circumferential groove (84) in the control slide (73) and the working chamber (86) are connected by way of a throttle point (80) in or on an annular part (85) located therebetween.
  7. Regulation device according to claim 6,
    characterized in that,
    the throttle point (80) is formed by means of a flattening of the annular part (85).
  8. Regulation device according to any of claims 2 to 7,
    characterized in that,
    the regulation member (76) exercises the force directed against the working pressure (A) either indirectly or directly on the control slide (73).
  9. Regulation device according to any of claims 2 to 8,
    characterized in that,
    the rest position of the control slide (73) is defined by means of a stop (72.1) of the valve slide (52).
  10. Regulation device according to any of claims 2 to 9,
    characterized in that,
    the regulation member (76) is formed as an angled lever (76) mounted tiltably around a turning axis (77) running transversely of the valve slide (52), one lever arm (75) of which angled lever is in connection with the control slide (73) and the other lever arm (78) of the angled lever is acted upon by an adjustable compression spring (79) against a piston (81) which can be acted upon with the working pressure (A) and which is transversely displaceable in the piston rod (34) of the adjusting cylinder (4).
  11. Regulation device according to claim 10,
    characterized in that,
    the lever arm (75) of the angled lever (76) is connected with the control slide (73) by means of a pressure pin (74) projecting out of a blind bore of the control slide (73).
EP90111124A 1989-06-12 1990-06-12 Control device for variable displacement pump Expired - Lifetime EP0402871B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3919175A DE3919175A1 (en) 1989-06-12 1989-06-12 CONTROL DEVICE FOR AN ADJUSTABLE PUMP
DE3919175 1989-06-12

Publications (3)

Publication Number Publication Date
EP0402871A2 EP0402871A2 (en) 1990-12-19
EP0402871A3 EP0402871A3 (en) 1992-09-02
EP0402871B1 true EP0402871B1 (en) 1996-04-17

Family

ID=6382606

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111124A Expired - Lifetime EP0402871B1 (en) 1989-06-12 1990-06-12 Control device for variable displacement pump

Country Status (2)

Country Link
EP (1) EP0402871B1 (en)
DE (2) DE3919175A1 (en)

Cited By (2)

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WO2019112554A1 (en) * 2017-12-04 2019-06-13 Halliburton Energy Services, Inc. Safety pressure limiting system and method for positive displacement pumps with optional automatic restart
DE102018216831A1 (en) * 2018-10-01 2020-04-02 Robert Bosch Gmbh Control device for pump pressure and volume flow with concentric control spools

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DE4208925C1 (en) * 1992-03-19 1993-06-03 Hydromatik Gmbh, 7915 Elchingen, De
DE4417962A1 (en) * 1994-05-21 1995-11-23 Rexroth Mannesmann Gmbh Control arrangement for at least two hydraulic consumers
DE19756600C1 (en) * 1997-12-18 1999-08-26 Brueninghaus Hydromatik Gmbh Capacity control valve
DE10358727B3 (en) 2003-12-15 2005-08-25 Brueninghaus Hydromatik Gmbh Total power controller
DE102011108285A1 (en) * 2010-12-22 2012-06-28 Robert Bosch Gmbh Hydraulic drive
CN114135458A (en) * 2021-11-30 2022-03-04 力源液压(苏州)有限公司 Constant power control structure of plunger pump

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DE2349124A1 (en) * 1973-09-29 1975-04-03 Rexroth Gmbh G L Hydraulic pressure control of positive displacement pumps - for pumps used in hydraulic circuits with pressure accumulators
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DE1911695A1 (en) * 1969-03-03 1970-11-19 Mannesmann Meer Ag Power regulator for hydraulic pumps or motors
DE1922145A1 (en) * 1969-04-25 1970-10-29 Bellows Valvair Kaemper Gmbh Combination controller
DE2349124A1 (en) * 1973-09-29 1975-04-03 Rexroth Gmbh G L Hydraulic pressure control of positive displacement pumps - for pumps used in hydraulic circuits with pressure accumulators
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019112554A1 (en) * 2017-12-04 2019-06-13 Halliburton Energy Services, Inc. Safety pressure limiting system and method for positive displacement pumps with optional automatic restart
US11346336B2 (en) 2017-12-04 2022-05-31 Halliburton Energy Services, Inc. Safety pressure limiting system and method for positive displacement pumps with optional automatic restart
DE102018216831A1 (en) * 2018-10-01 2020-04-02 Robert Bosch Gmbh Control device for pump pressure and volume flow with concentric control spools
US11353120B2 (en) 2018-10-01 2022-06-07 Robert Bosch Gmbh Regulating device for pump pressure and pump volumetric flow rate, having concentric control slide valves

Also Published As

Publication number Publication date
EP0402871A3 (en) 1992-09-02
DE59010287D1 (en) 1996-05-23
DE3919175C2 (en) 1993-01-07
EP0402871A2 (en) 1990-12-19
DE3919175A1 (en) 1990-12-13

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