EP1317624A1 - Hydraulic system comprising a main pump and a precompression pump - Google Patents

Hydraulic system comprising a main pump and a precompression pump

Info

Publication number
EP1317624A1
EP1317624A1 EP01956507A EP01956507A EP1317624A1 EP 1317624 A1 EP1317624 A1 EP 1317624A1 EP 01956507 A EP01956507 A EP 01956507A EP 01956507 A EP01956507 A EP 01956507A EP 1317624 A1 EP1317624 A1 EP 1317624A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic system
pump
main pump
control
pressure pump
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.)
Granted
Application number
EP01956507A
Other languages
German (de)
French (fr)
Other versions
EP1317624B1 (en
Inventor
Ralf Lemmen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brueninghaus Hydromatik GmbH
Original Assignee
Brueninghaus Hydromatik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Brueninghaus Hydromatik GmbH filed Critical Brueninghaus Hydromatik GmbH
Publication of EP1317624A1 publication Critical patent/EP1317624A1/en
Application granted granted Critical
Publication of EP1317624B1 publication Critical patent/EP1317624B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/08—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/106—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being an axial piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, 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
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/12—Combinations of two or more pumps the pumps being of different types at least one pump being of the rotary-piston positive-displacement type

Definitions

  • Hydraulic system with a main pump and one
  • the invention relates to a hydraulic system according to the preamble of claim 1.
  • WO 99/61796 describes a hydraulic system of the type specified at the outset with an adjustable main pump and a pre-pressure pump upstream of it and connected to it by a connecting line, an adjustable throttle being arranged in the connecting line and being adjustable by an electronic control device.
  • the inlet pressure of the main pump can be changed, whereby the delivery rate of the main pump can be influenced.
  • the throttle generates heat which not only proves to be a loss of power but also leads to heating of the hydraulic medium with associated cooling problems.
  • the invention has for its object to design a hydraulic system of the type mentioned in such a way that a high efficiency of the system can be achieved.
  • the admission pressure pump has an adjusting device for adjusting the admission pressure pump
  • the admission pressure pump it is possible to adjust the admission pressure pump and to establish or position it in the set position manually or by means of a control or regulating device.
  • a control or regulating device all that is required is an adjustment mechanism of the pre-pressure pump that can be operated manually.
  • the adjusting device of the admission pressure pump is assigned a control or regulating device, which preferably works automatically.
  • the subclaims contain, among other things, features that enable the use of various tax and regulatory features.
  • __. B. to control or regulate so that the delivery ratio is always the same. In this way, a constant suction pressure for the main pump is achieved and fluctuations in the delivery rate of the main pump caused by suction pressures of different sizes are avoided.
  • FIG. 1 shows a hydraulic system according to the invention as a functional diagram
  • Fig. 2 shows the system in a modified form.
  • a suction line 3 extends from a tank 2 to the inlet 4 of a pre-pressure pump 5, the delivery volume of which is adjustable.
  • the admission pressure pump 5 has an adjusting device 6, which is adjustable by a first control or regulating device 7 and can be locked in the adjusted or set position.
  • a connection line 9 extends from the outlet 8 of the admission pressure pump 5 to the inlet 11 of a main pump 12, the delivery volume of which is preferably also adjustable.
  • the main pump 12 has an adjusting device 13 which is adjustable and adjustable by a second control or regulating device 14.
  • the invention is not limited to a particular construction or function type of the pumps' 5, 12th This also applies to the adjusting devices 6, 13 and the control and regulating devices 7, 14. These can be of one of the known types of construction and function.
  • the pumps can each be, for example, a vane pump, radial piston pump or preferably an axial piston pump.
  • the pumps 5, 12 can be pressure-controlled or flow-controlled or power-controlled.
  • the Control devices 7, 14 can have a pressure regulator or delivery quantity regulator or power regulator.
  • control or regulating device 7, 14 taking into account control or regulating signals that the.
  • Control or regulating device 7, 14 are supplied by means of control or signal lines.
  • control or signal line 15 which extends from an outlet 16 of the main pump 12 to a consumer A.
  • Working pressure line 17 extends to the second control or regulating device 14. This can e.g. are a pressure signal for a pressure regulator or a delivery signal for a delivery regulator or a pressure and delivery signal for a power regulator.
  • Pressure signals or delivery quantity signals of the pre-pressure pump can also be fed to a pressure regulator or delivery quantity regulator of the first control or regulating device 7, e.g. by a control or signal line 18, which connects the connecting line 9 to the first control or regulating device 7. It is also possible to supply these signals also or only to the pressure controller or delivery rate controller or power controller of the second control device 14, which is illustrated by a control or signal line branch 18a connected to the second control device 14.
  • first control or regulating device 7 it is also possible within the scope of the invention to operate the first control or regulating device 7 as a function of the second control or regulating device 14.
  • Corresponding signals are transmitted to the first control or regulating device 7 from the second control or regulating device 14, for example through a signal line 19 connecting them.
  • the control or signal line branch 18b can be omitted.
  • the control or regulating signals can also be supplied from consumer A to first control or regulating device 7 and / or second control or regulating device 14, for example through signal lines which connect consumer A to the first and / or second control or regulating device 7, 14 connect.
  • two consumers B, C for example of a device, to be present, of which the control or regulating signals of one consumer B of the second control or regulating device 14 and the control or regulating signals of the other consumer C of the first control or control device 7, for example through the signal lines 20, 21.
  • the second consumer C can be connected to the connecting line 9 by a connecting line branch 9a and can thus be fed from it.
  • FIG. 2 It is also possible within the scope of the invention, according to the exemplary embodiment according to FIG. 2, in which the same or comparable parts are provided with the same reference numerals, as a function of the main pump 12, by means of a mechanical coupling 22 connecting the adjusting devices 6, 13 to control or regulate.
  • the adjustment devices 6, 13 are formed by swivel devices
  • the coupling 22 can e.g. be formed by a connecting rod 22a which is pivotally connected to the pivoting devices or to the pivoting levers thereof.
  • FIG. 2 Such an embodiment is shown in FIG. 2.
  • both pumps 5, 12 always have the same setting or delivery rate ratio, for example the same Swivel angle.
  • the pressure in the connecting line 9 and thus the suction pressure of the main pump 12 is always constant. Against it. in the case of a control or regulation of the primary pressure pump 5 that is independent of the main pump 12, the pressure in the connecting line 9 and thus also the suction pressure of the main pump 12 differ depending on the adjustment position of the primary pressure pump 5.
  • a coupling 22 it is also possible, in the presence of a coupling 22, to implement an adjustment which deviates from a ' synchronous adjustment of the form pressure pump 5, for example an adjustment which deviates according to a specific characteristic curve.
  • This can take place, for example, by means of a gear 23 or a motor, which is integrated in the mechanical coupling 22 and can be connected to the second control or regulating device 14, for example, by a control or signal line 24.
  • the gear 23 or the motor can, for. B. can be integrated into the mechanical coupling 22 or into the connecting rod 22a in such a way that their effective length, ie the distance between the connection or articulation points, is increased or shortened in the desired manner.
  • a hydraulic compensating connection 25 or overflow connection between the connecting line 9 and the tank 2 which makes it possible, if the delivery rates of the pumps 5, 12 are not the same, to overflow the to allow hydraulic medium to the tank or vice versa. If, for example, the delivery rate of the main pump 12 is smaller than the delivery rate of the pre-pressure pump 5, hydraulic fluid can flow to the tank 2 bypassing the pre-pressure pump 5. On the other hand, it is also possible, bypassing the form pressure pump 5, to suck hydraulic fluid towards the connecting line 9 if the delivery volume of the main pump 12 is greater than that of the form pressure pump 5.
  • bypasses formed by hydraulic lines the form pressure pump 5, can be bypassed 26, 27 can be formed, which Connect line 9 to tank 2 or suction line 3.
  • a valve 28, 29, preferably a check valve, is arranged in each of the bypasses 26, 27, of which one valve 28 makes it possible to draw hydraulic fluid to the connecting line 9, while the other valve 29 makes it possible to draw hydraulic fluid from the connecting line 9 to the Let tank 2 or flow to suction line 3.
  • the bypasses 26, 27 can be connected to the tank 2 or to the suction line 3, which is represented by indicated line branches ' .
  • admission pressure pump 5 separately from the main pump 12 or to add it to the main pump 5 or to integrate it into the main adjustment system, e.g. to integrate into the main pump 12.

Landscapes

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

Abstract

The invention relates to a hydraulic system (1) comprising a main pump (12) and a precompression pump (5), whereby the outlet (8) of the precompression pump (5) is connected by a connecting line (9) to the inlet (11) of the main pump (12). The outlet (16) of the main pump (12) can be connected by a working line (17) to a consumer (A, B). The volume flow at the inlet (11) of the main pump (12) is changeable. The aim of the invention is to achieve greater efficiency. The precompression pump (5) comprises an adjusting device (6) for adjusting the flow rate.

Description

Hydraulisches System mit einer Hauptpumpe und einer Hydraulic system with a main pump and one
Vordruckpumpebooster pump
Die Erfindung bezieht sich auf ein hydraulisches System nach dem Oberbegriff des Anspruches 1.The invention relates to a hydraulic system according to the preamble of claim 1.
Es ist aus verschiedenen- Gründen bekannt, einem hydraulischen System eine Hauptpumpe und eine Vordruckpumpe zuzuordnen, deren Ausgang durch eine Verbindungsleitung mit dem Eingang der Hauptpumpe verbunden ist. Die Vordruckpumpe saugt das hydraulische Medium aus einem Tank und fördert es der Hauptpumpe zu. Ein solches hydraulisches System ist z.B. in der DE-A 23 57 739 und der DE 34 01 775 C2 beschrieben. Bei beiden bekannten Systemen ist durch ein in der Verbindungsleitung angeordnetes oder damit verbundenes Überströmventil oder Druckbegrenzungsventil dafür gesorgt, daß eine von der Hauptpumpe nicht übernommene Fördermenge der .Vordruckpumpe zum Tank zurückgeführt wird. Dies ist auch dann vorteilhaft, wenn die Fördermenge der Hauptpumpe größer ist als die Fördermenge der Vordruckpumpe, um z.B. in der Anlaufphase hydraulische Zwängungen zu vermeiden und ein die Vordruckpumpe umgehendes Ansaugen der Hauptpumpe zu ermöglichen.It is known for various reasons to assign a main pump and a form pressure pump to a hydraulic system, the output of which is connected to the input of the main pump by a connecting line. The back pressure pump sucks the hydraulic medium from a tank and conveys it to the main pump. Such a hydraulic system is e.g. described in DE-A 23 57 739 and DE 34 01 775 C2. In both known systems, an overflow valve or pressure relief valve arranged in or connected to the connecting line ensures that a delivery volume of the pre-pressure pump which is not taken over by the main pump is returned to the tank. This is also advantageous if the delivery rate of the main pump is greater than the delivery rate of the admission pressure pump, e.g. to avoid hydraulic constraints during the start-up phase and to enable the main pump to be sucked in immediately.
In der WO 99/61796 ist ein hydraulisches System der eingangs angegebenen Art mit einer verstellbaren Hauptpumpe und einer ihr vorgeordneten und mit ihr durch eine Verbindungsleitung verbundenen Vordruckpumpe beschrieben, wobei in der Verbindungsleitung eine verstellbare Drossel angeordnet ist, die durch eine elektronische Steuereinrichtung verstellbar ist. Hierdurch läßt sich der Eingangsdruck der Hauptpumpe verändern, wodurch Einfluß auf die Fördermenge der Hauptpumpe genommen werden kann. Bei dieser bekannten Ausgestaltung ist nachteilig, daß im Funktionsbetrieb durch die Drossel Wärme erzeugt wird, die sich nicht nur als Leistungsverlust erweist sondern auch zu einer Erwärmung des hydraulischen Mediums mit zugehörigen Kühlproblemen führt. Der Erfindung liegt die Aufgabe zugrunde, ein hydraulisches System der eingangs angegebenen Art so auszugestalten, daß ein hoher Wirkungsgrad des Systems erreichbar ist.WO 99/61796 describes a hydraulic system of the type specified at the outset with an adjustable main pump and a pre-pressure pump upstream of it and connected to it by a connecting line, an adjustable throttle being arranged in the connecting line and being adjustable by an electronic control device. In this way, the inlet pressure of the main pump can be changed, whereby the delivery rate of the main pump can be influenced. In this known embodiment, it is disadvantageous that, in functional operation, the throttle generates heat which not only proves to be a loss of power but also leads to heating of the hydraulic medium with associated cooling problems. The invention has for its object to design a hydraulic system of the type mentioned in such a way that a high efficiency of the system can be achieved.
Diese Aufgabe wird durch die Merkmale des Anspruches 1 gelöst . Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.This object is solved by the features of claim 1. Advantageous developments of the invention are described in the subclaims.
Beim erfindungsgemäßen hydraulischen System weist die Vordruckpumpe eine Versteilvorrichtung zum Verstellen desIn the hydraulic system according to the invention, the admission pressure pump has an adjusting device for adjusting the
Fördervolumens auf. Diese erfindungsgemäße Ausgestaltung ist hinsichtlich mehrerer Aspekte vorteilhaft. Zum einen lassen sich der Ansaugdruck der Hauptpumpe vergrößern oder optimieren und daraus resultierende Verluste vermindern und somit der Wirkungsgrad und die Leistung der Hauptpumpe und des Systems vergrößern. Ein Strömungswiderstand und ein daraus resultierender Verlust, wie er bei dem bekanntenFunding volume. This embodiment of the invention is advantageous in several aspects. On the one hand, the suction pressure of the main pump can be increased or optimized and the resulting losses reduced, thus increasing the efficiency and performance of the main pump and the system. A flow resistance and a resulting loss, as in the known
System nach WO 99/61796 durch die verstellbare Drossel vorhanden ist, entfällt bei der erfindungsgemäßen Ausgestaltung.System according to WO 99/61796 by the adjustable throttle is not present in the configuration according to the invention.
Im Rahmen der Erfindung ist es möglich, eine Verstellung der Vordruckpumpe und eine Feststellung bzw. Positionierung in der eingestellten Stellung manuell oder mittels einer Steuer- oder Regeleinrichtung durchzuführen. Im ersten Fall bedarf es lediglich eines Verstellmechanismus der Vordruckpumpe, der manuell betätigbar ist. Im zweiten Fall ist der Versteilvorrichtung der Vordruckpumpe eine Steueroder Regeleinrichtung zugeordnet, die vorzugsweise automatisch funktioniert.Within the scope of the invention, it is possible to adjust the admission pressure pump and to establish or position it in the set position manually or by means of a control or regulating device. In the first case, all that is required is an adjustment mechanism of the pre-pressure pump that can be operated manually. In the second case, the adjusting device of the admission pressure pump is assigned a control or regulating device, which preferably works automatically.
In den Unteransprüchen sind unter anderem Merkmale enthalten, die die Ausnutzung verschiedener Steuer- und Regelmerkmale ermöglichen.The subclaims contain, among other things, features that enable the use of various tax and regulatory features.
Es ist im Rahmen der Erfindung auch möglich, dieIt is also possible within the scope of the invention
Fördermengen der Vordruck- und Hauptpumpe auf günstigeFlow rates of the pre-pressure and main pump on favorable
Verhältnisse abzustimmen, __ . B. so zu steuern oder zu regeln, daß das Fördermengenverhältnis immer gleich ist. Hierdurch wird ein konstanter Ansaugdruck für die Hauptpumpe erreicht, und es werden durch unterschiedlich große Ansaugdrucke hervorgerufene Schwankungen der Fördermenge der Hauptpumpe vermieden.To coordinate relationships, __. B. to control or regulate so that the delivery ratio is always the same. In this way, a constant suction pressure for the main pump is achieved and fluctuations in the delivery rate of the main pump caused by suction pressures of different sizes are avoided.
Nachfolgend werden die Erfindung und weitere durch sie erzielbare Vorteile anhand von vorteilhaften Ausgestaltungen von Ausführungsbeispielen und vereinfachten Zeichnungen näher erläutert . Es zeigenThe invention and further advantages which can be achieved by it are explained in more detail below on the basis of advantageous configurations of exemplary embodiments and simplified drawings. Show it
Fig. 1 ein erfindungsgemäßes hydraulisches System als Funktionsplan;1 shows a hydraulic system according to the invention as a functional diagram;
Fig. 2 das System in abgewandelter Ausgestaltung.Fig. 2 shows the system in a modified form.
Bei dem in seiner Gesamtheit mit 1 bezeichneten hydraulischen System erstreckt sich von einem Tank 2 eine Saugleitung 3 zum Eingang 4 einer Vordruckpumpe 5, deren Fördervolumen verstellbar ist. Die Vordruckpumpe 5 weist , eine Versteilvorrichtung 6 auf, die durch eine erste Steueroder Regeleinrichtung 7 verstellbar und in der verstellten bzw. eingestellten Position feststellbar ist.In the hydraulic system designated as a whole by 1, a suction line 3 extends from a tank 2 to the inlet 4 of a pre-pressure pump 5, the delivery volume of which is adjustable. The admission pressure pump 5 has an adjusting device 6, which is adjustable by a first control or regulating device 7 and can be locked in the adjusted or set position.
Vom Ausgang 8 der Vordruckpumpe 5 erstreckt sich eine Ver- bindungsleitung 9 zum Eingang 11 einer Hauptpumpe 12, deren Fördervolumen vorzugsweise ebenfalls verstellbar ist. Hierzu weist die Hauptpumpe 12 eine VerStellvorrichtung 13 auf, die durch eine zweite Steuer- oder Regeleinrichtung 14 verstellbar und einstellbar ist.A connection line 9 extends from the outlet 8 of the admission pressure pump 5 to the inlet 11 of a main pump 12, the delivery volume of which is preferably also adjustable. For this purpose, the main pump 12 has an adjusting device 13 which is adjustable and adjustable by a second control or regulating device 14.
Die Erfindung ist nicht auf eine besondere Bau- oder Funktionsart der Pumpen' 5, 12 beschränkt. Dies gilt auch für die Versteilvorrichtungen 6, 13 und die Steuer- und Regeleinrichtungen 7, 14. Diese können von einer der bekannten Bau- und Funktionsarten sein. Bei den Pumpen kann es sich jeweils z.B. um eine Flügelzellenpumpe, Radialkolbenpumpe oder vorzugsweise Axialkolbenpumpe handeln. Die Pumpen 5, 12 können druckgesteuert oder fördermengengesteuert oder leistungsgesteuert sein. Die Regeleinrichtungen 7, 14 können einen Druckregler oder Fördermengenregler oder Leistungsregler aufweisen.The invention is not limited to a particular construction or function type of the pumps' 5, 12th This also applies to the adjusting devices 6, 13 and the control and regulating devices 7, 14. These can be of one of the known types of construction and function. The pumps can each be, for example, a vane pump, radial piston pump or preferably an axial piston pump. The pumps 5, 12 can be pressure-controlled or flow-controlled or power-controlled. The Control devices 7, 14 can have a pressure regulator or delivery quantity regulator or power regulator.
Die vorgenannten Steuer- oder Regelfunktionen werden durch die zugehörige Steuer- oder Regelvorrichtung 7, 14 unter Berücksichtigung von Steuer- oder Regelsignalen gesteuert oder geregelt, die der . Steuer- oder Regeleinrichtung 7, 14 mittels Steuer- bzw. Signalleitungen zugeführt werden.The aforementioned control or regulating functions are controlled or regulated by the associated control or regulating device 7, 14 taking into account control or regulating signals that the. Control or regulating device 7, 14 are supplied by means of control or signal lines.
Fig. 1 zeigt eine Steuer- bzw. Signalleitung 15, die sich von einer sich vom Ausgang 16 der Hauptpumpe 12 zu einem Verbraucher A erstreckenden. Arbeitsdruckleitung 17 zur zweiten Steuer- oder Regeleinrichtung 14 erstreckt . Hierbei kann es sich z.B. um ein Drucksignal für einen Druckregler oder ein Fördermengensignal für einen Fördermengenregler oder ein Druck- und Fördermengensignal für einen Leistungsregler handeln.1 shows a control or signal line 15, which extends from an outlet 16 of the main pump 12 to a consumer A. Working pressure line 17 extends to the second control or regulating device 14. This can e.g. are a pressure signal for a pressure regulator or a delivery signal for a delivery regulator or a pressure and delivery signal for a power regulator.
Es können auch Drucksignale oder Fördermengensignale der Vordruckpumpe einem Druckregler oder Fördermengenregler der ersten Steuer- oder Regeleinrichtung 7 zugeführt werden, z.B. durch eine Steuer- bzw. Signalleitung 18, die die Verbindungsleitung 9 mit der ersten Steuer- oder Regeleinrichtung 7 verbindet. Es ist auch möglich, diese Signale auch oder nur dem Druckregler oder Fördermengenregler oder Leistungsregler der zweiten Regeleinrichtung 14 zuzuführen, was durch einen mit der zweiten Regeleinrichtung 14 verbundenen Steuer- bzw. Signalleitungszweig 18a verdeutlicht ist.Pressure signals or delivery quantity signals of the pre-pressure pump can also be fed to a pressure regulator or delivery quantity regulator of the first control or regulating device 7, e.g. by a control or signal line 18, which connects the connecting line 9 to the first control or regulating device 7. It is also possible to supply these signals also or only to the pressure controller or delivery rate controller or power controller of the second control device 14, which is illustrated by a control or signal line branch 18a connected to the second control device 14.
Es ist im Rahmen der Erfindung auch möglich, die erste Steuer- oder Regeleinrichtung 7 in Abhängigkeit von der zweiten Steuer- oder Regeleinrichtung 14 zu betreiben. Hierbei werden der ersten Steuer- oder Regeleinrichtung 7 entsprechende Signale von der zweiten Steuer- oder Regeleinrichtung 14 übermittelt, z.B. durch eine sie verbindende Signalleitung 19. In iesem Fall kann der Steuer- bzw. Signalleitungszweig 18b entfallen. Die Steuer- oder Regelsignale können auch vom Verbraucher A der ersten Steuer- oder Regeleinrichtung 7 und/oder der zweiten Steuer- oder Regeleinrichtung 14 zugeführt werden, z.B. durch Signalleitungen, die den Verbraucher A jeweils mit der ersten und/oder zweiten Steuer- oder Regeleinrichtung 7, 14 verbinden. Es ist auch möglich, daß zwei Verbraucher B, C z.B. eines Gerätes, vorhanden sind, von denen die Steuer- oder Regelsignale des einen Verbrauchers B der zweiten Steuer- oder Regeleinrichtung 14 und die Steuer- oder Regelsignale des anderen Verbrauchers C der ersten Steuer- oder Regeleinrichtung 7 zugeführt werden, z.B. durch die Signalleitungen 20, 21. Auch hierbei ist es möglich, die Signale des Verbrauchers B und/oder C der zweiten Steueroder Regeleinrichtung 14 und/oder der ersten Steuer- oder Regeleinrichtung 7 zuzuführen, was durch die Signalleitungszweige 20a, 20b verdeutlicht ist.It is also possible within the scope of the invention to operate the first control or regulating device 7 as a function of the second control or regulating device 14. Corresponding signals are transmitted to the first control or regulating device 7 from the second control or regulating device 14, for example through a signal line 19 connecting them. In this case, the control or signal line branch 18b can be omitted. The control or regulating signals can also be supplied from consumer A to first control or regulating device 7 and / or second control or regulating device 14, for example through signal lines which connect consumer A to the first and / or second control or regulating device 7, 14 connect. It is also possible for two consumers B, C, for example of a device, to be present, of which the control or regulating signals of one consumer B of the second control or regulating device 14 and the control or regulating signals of the other consumer C of the first control or control device 7, for example through the signal lines 20, 21. Here, too, it is possible to supply the signals of the consumer B and / or C to the second control or regulating device 14 and / or the first control or regulating device 7, which is caused by the signal line branches 20a, 20b is clarified.
Der zweite Verbraucher C kann durch einen Verbindungsleitungszweig 9a mit der Verbindungsleitung 9 verbunden sein und somit daraus gespeist werden.The second consumer C can be connected to the connecting line 9 by a connecting line branch 9a and can thus be fed from it.
Es ist im Rahmen der Erfindung auch möglich, gemäß dem Ausführungsbeispiel nach Fig. 2, bei dem gleiche oder vergleichbare Teile mit gleichen Bezugszeichen versehen sind, die Vordruckpumpe 5 in Abhängigkeit von der Hauptpumpe 12 durch eine die Verstellvorrichtungen 6, 13 miteinander verbindende mechanische Kopplung 22 zu steuern oder zu regeln. Wenn die Versteilvorrichtungen 6, 13 durch Schwenkvorrichtungen gebildet sind, kann die Kopplung 22 z.B. durch eine VerbindungsStange 22a gebildet sein, die gelenkig mit den Schwenkvorrichtungen bzw. mit deren Schwenkhebeln verbunden ist. Eine solche Ausgestaltung ist in Fig. 2 dargestellt.It is also possible within the scope of the invention, according to the exemplary embodiment according to FIG. 2, in which the same or comparable parts are provided with the same reference numerals, as a function of the main pump 12, by means of a mechanical coupling 22 connecting the adjusting devices 6, 13 to control or regulate. If the adjustment devices 6, 13 are formed by swivel devices, the coupling 22 can e.g. be formed by a connecting rod 22a which is pivotally connected to the pivoting devices or to the pivoting levers thereof. Such an embodiment is shown in FIG. 2.
Wenn die Vordruckpumpe 5 durch eine geeignete Steuer- oder Regeleinrichtung oder Koppelung in Abhängigkeit von der Verstellung der Hauptpumpe 12 verstellt und eingestellt wird, haben beide Pumpen 5, 12 immer das gleiche Ein- stellungs- bzw. Fördermengenverhältnis, z.B. den gleichen Schwenkwinkel . Dabei ist der Druck in der Verbindungsleitung 9 und somit der Ansaugdruck der Hauptpumpe 12 immer konstant. Dagegen ist. bei einer von der Hauptpumpe 12 unabhängigen Steuerung oder Regelung der Vordruckpumpe 5 der Druck in der Verbindungsleitung 9 und somit auch der Ansaugdruck der Hauptpumpe 12 je nach Verstellposition der Vordruckpumpe 5 unterschiedlich.If the pre-pressure pump 5 is adjusted and adjusted by a suitable control or regulating device or coupling as a function of the adjustment of the main pump 12, both pumps 5, 12 always have the same setting or delivery rate ratio, for example the same Swivel angle. The pressure in the connecting line 9 and thus the suction pressure of the main pump 12 is always constant. Against it. in the case of a control or regulation of the primary pressure pump 5 that is independent of the main pump 12, the pressure in the connecting line 9 and thus also the suction pressure of the main pump 12 differ depending on the adjustment position of the primary pressure pump 5.
Es ist im weiteren auch möglich, beim Vorhandensein einer Kopplung 22 eine von einer ' synchronen Verstellung der Vordruckpumpe 5 abweichende Verstellung zu realisieren, z.B. eine gemäß einer bestimmten Kennlinie abweichende Verstellung. Dies kann z.B. durch ein andeutungsweise dargestelltes Getriebe 23 oder einen Motor erfolgen, der in die mechanische Kopplung 22 integriert ist und z.B. durch eine Steuer- bzw. Signalleitung 24 mit der zweiten Steueroder Regeleinrichtung 14 verbunden sein kann. Das Getriebe 23 oder der Motor können z. B. so in die mechanische Kopplung 22 bzw. in die Verbindungsstange 22a integriert sein, daß sie deren wirksame Länge, d. h., den Abstand der Verbindungs- bzw. Gelenkpunkte, in der gewünschten Weise vergrößern oder verkürzen.Furthermore, it is also possible, in the presence of a coupling 22, to implement an adjustment which deviates from a ' synchronous adjustment of the form pressure pump 5, for example an adjustment which deviates according to a specific characteristic curve. This can take place, for example, by means of a gear 23 or a motor, which is integrated in the mechanical coupling 22 and can be connected to the second control or regulating device 14, for example, by a control or signal line 24. The gear 23 or the motor can, for. B. can be integrated into the mechanical coupling 22 or into the connecting rod 22a in such a way that their effective length, ie the distance between the connection or articulation points, is increased or shortened in the desired manner.
Es ist bei allen Ausführungsbeispielen im weiteren auch möglich, zwischen der Verbindungsleitung 9 und dem Tank 2 • eine hydraulische Ausgleichsverbindung 25 oder Überströmverbindung zu schaffen, die es ermöglicht, dann, wenn die Fördermengen der Pumpen 5, 12 nicht gleich groß sind, ein Überströmen des hydraulischen Mediums zum Tank oder umgekehrt zu gestatten. Wenn z.B. die Fördermenge der Hauptpumpe 12 kleiner ist als die Fördermenge der Vordruckpumpe 5, kann Hydraulikflüssigkeit bei Umgehung der Vordruckpumpe 5 zum Tank 2 strömen. Dagegen ist es auch möglich, unter Umgehung der Vordruckpumpe 5 Hydraulikflüssigkeit zur Verbindungsleitung 9 hin zu saugen, wenn die Fördermenge der Hauptpumpe 12 größer ist als die der Vordruckpumpe 5. Um dies zu ermöglichen, können z.B. zwei durch Hydraulikleitungen gebildete, die Vordruckpumpe 5 umgehende Beipässe 26, 27 gebildet sein, die die Verbin- dungsleitung 9 mit dem Tank 2 oder mit der Saugleitung 3 verbinden. In den Beipässen 26, 27 ist jeweils ein Ventil 28, 29, vorzugsweise ein Rückschlagventil, angeordnet, von denen das eine Ventil 28 es ermöglicht, Hydraulikflüssigkeit zur Verbindungsleitung 9 zu saugen, während das andere Ventil 29 es ermöglicht, Hydraulikflüssigkeit von der Verbindungsleitung 9 zum Tank 2 oder zur Saugleitung 3 hin strömen zu lassen. Die Bypässe 26, 27 können mit dem Tank 2 oder mit der Saugleitung 3 verbunden sein, was durch angedeutete Leitungszweige' dargestellt ist.In all of the exemplary embodiments, it is also possible to create a hydraulic compensating connection 25 or overflow connection between the connecting line 9 and the tank 2, which makes it possible, if the delivery rates of the pumps 5, 12 are not the same, to overflow the to allow hydraulic medium to the tank or vice versa. If, for example, the delivery rate of the main pump 12 is smaller than the delivery rate of the pre-pressure pump 5, hydraulic fluid can flow to the tank 2 bypassing the pre-pressure pump 5. On the other hand, it is also possible, bypassing the form pressure pump 5, to suck hydraulic fluid towards the connecting line 9 if the delivery volume of the main pump 12 is greater than that of the form pressure pump 5. To make this possible, two bypasses formed by hydraulic lines, the form pressure pump 5, can be bypassed 26, 27 can be formed, which Connect line 9 to tank 2 or suction line 3. A valve 28, 29, preferably a check valve, is arranged in each of the bypasses 26, 27, of which one valve 28 makes it possible to draw hydraulic fluid to the connecting line 9, while the other valve 29 makes it possible to draw hydraulic fluid from the connecting line 9 to the Let tank 2 or flow to suction line 3. The bypasses 26, 27 can be connected to the tank 2 or to the suction line 3, which is represented by indicated line branches ' .
Es ist bei allen Ausführungsbeispielen im weiteren auch möglich, die Vordruckpumpe 5 getrennt von der Hauptpumpe 12 anzuordnen oder an die Hauptpumpe 5 anzubauen oder in das Hauptverstellsystem zu integrieren, z.B. in die Hauptpumpe 12 zu integrieren. In all of the exemplary embodiments it is also possible to arrange the admission pressure pump 5 separately from the main pump 12 or to add it to the main pump 5 or to integrate it into the main adjustment system, e.g. to integrate into the main pump 12.

Claims

Ansprüche Expectations
1. Hydraulisches System (1) mit einer Hauptpumpe (12) und einer Vordruckpumpe (5) , wobei der Ausgang (8) der Vordruck- pumpe (5) durch eine Verbindungsleitung (9) mit dem Eingang1. Hydraulic system (1) with a main pump (12) and a pre-pressure pump (5), the output (8) of the pre-pressure pump (5) through a connecting line (9) to the input
(11) der Hauptpumpe (12) verbunden ist, wobei der Ausgang(11) the main pump (12) is connected, the output
(16) der Hauptpumpe (12) durch eine Arbeitsleitung (17) mit einem Verbraucher (A, B) verbindbar ist, und wobei der(16) the main pump (12) can be connected to a consumer (A, B) by a working line (17), and wherein the
Volumenstrom am Eingang (11) der Hauptpumpe (12) veränderlich ist, dadurch gekennzeichnet, daß die Vordruckpumpe (5) eine VerStellvorrichtung (6) zumVolume flow at the inlet (11) of the main pump (12) is variable, characterized in that the admission pressure pump (5) is an adjusting device (6) for
Verstellen ihrer Fδrdermenge aufweist.Adjusting their amount of funding.
2. Hydraulisches System nach Anspruch 1, dadurch gekennzeichnet, daß auch die Hauptpumpe (12) eine Versteilvorrichtung (13) zum Verstellen ihrer Fördermenge aufweist.2. Hydraulic system according to claim 1, characterized in that the main pump (12) has an adjusting device (13) for adjusting its delivery rate.
3. Hydraulisches System nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Versteilvorrichtung (6) der Vordruckpumpe (5) und/oder die Verstellvorrichtung (13) der Hauptpumpe (12) jeweils einzeln oder gemeinsam manuell steuerbar oder regelbar bzw. einstellbar ist bzw. sind.3. Hydraulic system according to claim 1 or 2, characterized in that the adjusting device (6) of the admission pressure pump (5) and / or the adjusting device (13) of the main pump (12) is individually controllable or adjustable or adjustable manually or jointly . are.
4. Hydraulisches System nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Verstellvorrichtung (6) der Vordruckpumpe (5) und/oder die Verstellvorrichtung (13) der Hauptpumpe (12) durch eine jeweils zugehörige Steuer- oder Regeleinrichtung (14) oder eine gemeinsame Steuer- oder Regeleinrichtung (14) Steuer- oder regelbar sind.4. Hydraulic system according to claim 1 or 2, characterized in that the adjusting device (6) of the admission pressure pump (5) and / or the adjusting device (13) of the main pump (12) by an associated control or regulating device (14) or one common control or regulating device (14) can be controlled or regulated.
5. Hydraulisches System nach Anspruch 4, dadurch gekennzeichnet, daß die Hauptpumpe (12) unter Berücksichtigung des Druckes in der Arbeitsleitung (17) und/oder des Druckes in der Verbindungsleitung (9) gesteuert oder geregelt ist. 5. Hydraulic system according to claim 4, characterized in that the main pump (12) is controlled or regulated taking into account the pressure in the working line (17) and / or the pressure in the connecting line (9).
6. Hydraulisches System nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Vordruckpumpe (5) unter Berücksichtigung des Druckes , in der Arbeitsleitung ' (17) und/oder des Druckes in der Verbindungsleitung (9) gesteuert oder geregelt ist.6. Hydraulic system according to claim 4 or 5, characterized in that the admission pressure pump (5) is controlled or regulated taking into account the pressure in the working line ' (17) and / or the pressure in the connecting line (9).
7. Hydraulisches System nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Hauptpumpe (12) unter Berücksichtigung von Steueroder Regelsignalen wenigstens eines Verbrauchers (A, B) gesteuert oder geregelt ist.7. Hydraulic system according to one of the preceding claims, characterized in that the main pump (12) is controlled or regulated taking into account control or control signals of at least one consumer (A, B).
8. Hydraulisches System nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Vordruckpumpe (5) unter Berücksichtigung von Steueroder Regelsignalen wenigstens eines Verbrauchers (A, B) gesteuert oder geregelt ist.8. Hydraulic system according to one of the preceding claims, characterized in that the admission pressure pump (5) is controlled or regulated taking into account control or regulating signals of at least one consumer (A, B).
, .
9. Hydraulisches System' nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die erste Regeleinrichtung (7) oder die zweite Regeleinrichtung (14) oder die gemeinsame Regeleinrichtung (14) einen Druckregler aufweist.9. Hydraulic system ' according to one of claims 4 to 6, characterized in that the first control device (7) or the second control device (14) or the common control device (14) has a pressure regulator.
10. Hydraulisches System nach einem der Ansprüche 4 bis 6 oder 9 , dadurch gekennzeichnet, daß die erste Regeleinrichtung (7) oder die zweite Regelein- richtung (14) oder die gemeinsame Regeleinrichtung (14) einen Fördermengenregler aufweist .10. Hydraulic system according to one of claims 4 to 6 or 9, characterized in that the first control device (7) or the second control device (14) or the common control device (14) has a flow rate controller.
11. Hydraulisches System nach einem der vorherigen Ansprüche 4 bis 6 oder 9 oder 10, dadurch gekennzeichnet, daß die erste Regeleinrichtung (7) oder die zweite Regeleinrichtung (14) oder die gemeinsame Regeleinrichtung (14) einen Leistungsregler aufweist. 11. Hydraulic system according to one of the preceding claims 4 to 6 or 9 or 10, characterized in that the first control device (7) or the second control device (14) or the common control device (14) has a power controller.
12. Hydraulisches System nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Vordruckpumpe (5) in Abhängigkeit der Hauptpumpe (12) synchron gesteuert oder geregelt ist.12. Hydraulic system according to one of the preceding claims, characterized in that the admission pressure pump (5) is controlled or regulated in dependence on the main pump (12).
13. Hydraulisches System nach Anspruch 12, dadurch gekennzeichnet, daß die VerStellvorrichtungen (6, 13) der Vorderdruckpumpe (5) und der Hauptpumpe (12) durch eine vorzugsweise mechanische Kopplung (22) miteinander gekoppelt sind.13. Hydraulic system according to claim 12, characterized in that the adjusting devices (6, 13) of the front pressure pump (5) and the main pump (12) are coupled to one another by a preferably mechanical coupling (22).
14. Hydraulisches System nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die erste Verbindungsleitung (9) einen Verbindungs- leitungszweig (9a) zur Verbindung mit einem zweiten Verbraucher (C) aufweist.14. Hydraulic system according to claim 7 or 8, characterized in that the first connecting line (9) has a connecting line branch (9a) for connection to a second consumer (C).
15. Hydraulisches System nach einem der Ansprüche 4 bis 6, 9, 10 oder 11, dadurch gekennzeichnet, daß die Steuer- oder Regeleinrichtung (7) der Vordruckpumpe (5) und/oder die Steuer- oder Regeleinrichtung (14) der Hauptpumpe (12) oder eine gemeinsame Steuer- oder Regeleinrichtung (14) Funktionssignale des Verbrauchers (A) oder des jeweils zugehörigen Verbrauchers (B, C) berücksichtigt bzw. berücksichtigen.15. Hydraulic system according to one of claims 4 to 6, 9, 10 or 11, characterized in that the control or regulating device (7) of the admission pressure pump (5) and / or the control or regulating device (14) of the main pump (12th ) or a common control or regulating device (14) takes functional signals from the consumer (A) or the associated consumer (B, C) into account.
16. Hydraulisches System nach einem der vorherigen Ansprüche , dadurch gekennzeichnet, daß eine Ausgleichsvorrichtung (25) für das hydraulische Medium zwischen der Verbindungsleitung (9) oder dem Verbindungsleitungszweig (9a) und dem Tank (2) oder der Saugleitung (3) vorgesehen ist.16. Hydraulic system according to one of the preceding claims, characterized in that a compensation device (25) for the hydraulic medium between the connecting line (9) or the connecting line branch (9a) and the tank (2) or the suction line (3) is provided.
17. Hydraulisches System nach Anspruch 16, dadurch gekennzeichnet, daß die AusgleichsvorriOhtung (25) durch einen die Vordruckpumpe (5) umgehenden Beipaß (26, 27) gebildet ist, in dem ein Ventil (28, 29), insbesondere ein Rückschlagventil, angeordnet ist, das eine Strömung in der einen Strömungs- richtung zuläßt und in der anderen Strömungsrichtung sperrt.17. Hydraulic system according to claim 16, characterized in that that the compensation device (25) is formed by a bypass (26, 27) which bypasses the admission pressure pump (5) and in which a valve (28, 29), in particular a non-return valve, is arranged which permits a flow in one flow direction and blocks in the other flow direction.
18. Hydraulisches System nach Anspruch 17, dadurch gekennzeichnet , daß zwei Beipässe (26, 27) vorgesehen sind, deren Ventile (28, 29) in einander entgegengesetzten Strömungsrichtungen öffnen und sperren. 18. Hydraulic system according to claim 17, characterized in that two bypasses (26, 27) are provided, the valves (28, 29) open and block in opposite directions of flow.
EP01956507A 2000-09-13 2001-06-29 Hydraulic system comprising a main pump and a precompression pump Expired - Lifetime EP1317624B1 (en)

Applications Claiming Priority (3)

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DE10045118 2000-09-13
DE10045118A DE10045118B4 (en) 2000-09-13 2000-09-13 Hydraulic system with a main pump and a pre-pressure pump
PCT/EP2001/007459 WO2002023041A1 (en) 2000-09-13 2001-06-29 Hydraulic system comprising a main pump and a precompression pump

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EP (1) EP1317624B1 (en)
JP (1) JP5016776B2 (en)
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DE50113730D1 (en) 2008-04-24
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DE10045118A1 (en) 2002-03-28
US6997685B2 (en) 2006-02-14
EP1317624B1 (en) 2008-03-12
WO2002023041A1 (en) 2002-03-21
JP2004509269A (en) 2004-03-25
US20030185687A1 (en) 2003-10-02

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