EP1317624B1 - Hydraulic system comprising a main pump and a precompression pump - Google Patents

Hydraulic system comprising a main pump and a precompression pump Download PDF

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Publication number
EP1317624B1
EP1317624B1 EP01956507A EP01956507A EP1317624B1 EP 1317624 B1 EP1317624 B1 EP 1317624B1 EP 01956507 A EP01956507 A EP 01956507A EP 01956507 A EP01956507 A EP 01956507A EP 1317624 B1 EP1317624 B1 EP 1317624B1
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EP
European Patent Office
Prior art keywords
hydraulic system
pump
regulating device
main pump
pressure
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
Application number
EP01956507A
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German (de)
French (fr)
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EP1317624A1 (en
Inventor
Ralf Lemmen
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Brueninghaus Hydromatik GmbH
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Brueninghaus Hydromatik GmbH
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Publication of EP1317624A1 publication Critical patent/EP1317624A1/en
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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

  • the invention relates to a hydraulic system according to the preamble of claim 1.
  • a hydraulic system of this kind is eg in the DE-AS 23 57 739 or DE 34 01 775 C2 or WO 99/61796 described.
  • WO 99/61796 is a hydraulic system with an adjustable main pump and its upstream and connected to it by a connecting line form pressure pump described, wherein in the connecting line an adjustable throttle is arranged, which is adjustable by an electronic control device.
  • the input pressure of the main pump can be changed, whereby influence on the flow rate of the main pump can be taken.
  • this known embodiment is disadvantageous that heat is generated in the functional operation by the throttle, not only as Power loss but also leads to a warming of the hydraulic medium with associated cooling problems.
  • From the GB 2150981A is to remove a method and a device for conveying fluid, wherein a first and a second pump are provided, which convey fluid from a reservoir to a line end.
  • the first pump and the second pump are each adjustable by an adjusting device which can be controlled by a programmable control device. It is the purpose of this prior art hydraulic system to ensure the most even possible discharge of the pumped out of a reservoir liquid at the line end.
  • the invention has the object of providing a hydraulic system of the type described in such a way that a high efficiency of the system can be achieved.
  • the pre-pressure pump has an adjusting device for adjusting the Delivery volume, wherein the pre-pressure pump is controlled or regulated taking into account control or control signals of at least one consumer.
  • This embodiment according to the invention is advantageous with regard to several aspects.
  • the suction pressure of the main pump can be increased or optimized and losses resulting therefrom reduce and thus increase the efficiency and performance of the main pump and the system.
  • a flow resistance and a resulting loss, as in the known system according to WO 99/61796 is present by the adjustable throttle, is omitted in the embodiment of the invention.
  • the pre-pressure pump In the context of the invention, it is possible to perform an adjustment of the pre-pressure pump and a determination or positioning in the set position manually or by means of a control or regulating device. In the first case, it only requires an adjustment mechanism of the pre-pressure pump, which is manually operable. In the second case, the adjustment of the pre-pressure pump is associated with a control or regulating device, which preferably operates automatically.
  • hydraulic system extends from a tank 2, a suction line 3 to the input 4 of a pre-pressure pump 5, the delivery volume is adjustable.
  • the pre-pressure pump 5 has an adjusting device 6, which can be adjusted by a first control or regulating device 7 and in the adjusted or set position.
  • a connecting line 9 extends to the input 11 of a main pump 12, the delivery volume 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 type of construction or function of the Pumpen'5, 12. This also applies to the adjusting devices 6, 13 and the control and regulating devices 7, 14. These may be of one of the known construction and functional types.
  • the pumps can each be, for example, a vane pump, radial piston pump or preferably axial piston pump.
  • the pumps 5, 12 may be pressure controlled or flow rate controlled or power controlled.
  • the Control devices 7, 14 may have a pressure regulator or flow regulator or power regulator.
  • control or regulating functions are controlled or regulated by the associated control or regulating device 7, 14 taking into account control or regulating signals which are supplied to the control or regulating device 7, 14 by means of control or signal lines.
  • Fig. 1 shows a control or signal line 15, which extends from one of the output 16 of the main pump 12 to a consumer A extending working pressure line 17 to the second control or regulating device 14.
  • This may be, for example, a pressure signal for a pressure regulator or a flow rate signal for a flow regulator or a pressure and flow rate signal for a power regulator.
  • pressure signals or flow rate signals from the priming pump may be supplied to a pressure regulator or flow regulator of the first controller 7, e.g. by a control or signal line 18, which connects the connecting line 9 with the first control or regulating device 7. It is also possible to supply these signals also or only to the pressure regulator or flow regulator or power regulator of the second control device 14, which is illustrated by a connected to the second control device 14 control or signal line branch 18a.
  • the first control or regulating device 7 is operated as a function of the second control or regulating device 14.
  • the first control or regulating device 7 corresponding signals from the second control or regulating device 14 are transmitted, for example, by a signal line connecting them 19.
  • the control or signal line branch 18b omitted.
  • the control signals may also be supplied by the consumer A to the first controller 7 and / or the second controller 14, e.g. by signal lines which connect the consumer A respectively to the first and / or second control or regulating device 7, 14.
  • two consumers B, C e.g. a device are present, from which the control or regulating signals of the 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 regulating device 7 are supplied, e.g. by the signal lines 20, 21.
  • the second consumer C may be connected by a connecting line branch 9a to the connecting line 9 and thus fed from it.
  • the priming pump 5 in response to the main pump 12 by the adjusting devices 6, 13 interconnecting mechanical coupling 22 to control or regulate.
  • the coupling 22 may be formed, for example, by a connecting rod 22a, which is pivotally connected to the pivoting devices or with their pivoting levers.
  • both pumps 5, 12 When 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 ratio, for example the same Swivel angle. In this case, the pressure in the connecting line 9 and thus the suction pressure of the main pump 12 is always constant. In contrast, in a independent of the main pump 12 control or regulation of the priming pump 5, the pressure in the connecting line 9 and thus also the suction pressure of the main pump 12 depending on the adjustment of the admission pressure pump 5 different.
  • a coupling 22 it is also possible, in the presence of a coupling 22, to realize an adjustment deviating from a synchronous adjustment of the priming pump 5, e.g. a deviating according to a certain characteristic adjustment.
  • This can e.g. by a suggestively illustrated gear 23 or a motor integrated in the mechanical coupling 22 and e.g. may be connected by a control or signal line 24 to the second control or regulating device 14.
  • the gear 23 or the engine can, for. B. be integrated into the mechanical coupling 22 and in the connecting rod 22 a that they their effective length, d. h., increase the distance of the connection or hinge points, in the desired manner or shorten.
  • connection 25 or overflow it is also possible in all embodiments in the further, between the connecting line 9 and the tank 2 to provide a hydraulic compensation connection 25 or overflow, which makes it possible, if the delivery rates of the pump 5, 12 are not the same size, an overflow of the 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 admission pressure pump 5, hydraulic fluid can flow to the tank 2 when the admission pressure pump 5 is bypassed. On the other hand, it is also possible to suck hydraulic fluid to the connection line 9, bypassing the admission pressure pump 5, when the delivery rate of the main pump 12 is greater than that of the admission pressure pump 5.
  • two bypasses formed by hydraulic lines and bypassing the admission pressure pump 5 can be provided 26, 27 are formed, which is the connecting line 9 with the tank 2 or with the suction line 3 connect.
  • the bypasses 26, 27 may 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 grow it on the main pump 5 or to integrate it into the main adjustment system, e.g. to integrate into the main pump 12.

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

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.

Ein hydraulisches System dieser Art ist z.B. in der DE-AS 23 57 739 oder DE 34 01 775 C2 oder WO 99/61796 beschrieben.A hydraulic system of this kind is eg in the DE-AS 23 57 739 or DE 34 01 775 C2 or WO 99/61796 described.

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. Bei den aus der DE-A 23 57 739 und der DE 34 01 775 C2 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 associate a hydraulic system, a main pump and a pre-pressure pump whose output is connected by a connecting line to the input of the main pump. The pre-pressure pump draws the hydraulic medium from a tank and delivers it to the main pump. In the from the DE-A 23 57 739 and the DE 34 01 775 C2 known systems is provided by a arranged in the connecting line or connected thereto overflow valve or pressure relief valve ensures that a not taken from the main pump flow rate of the pre-pressure 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 pre-pressure pump, for example, in the start-up phase, to avoid hydraulic constraints and to allow the pre-pressure pump immediate intake of the main pump.

In der WO 99/61796 ist ein hydraulisches System 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.In the WO 99/61796 is a hydraulic system with an adjustable main pump and its upstream and connected to it by a connecting line form pressure pump described, wherein in the connecting line an adjustable throttle is arranged, which is adjustable by an electronic control device. As a result, the input pressure of the main pump can be changed, whereby influence on the flow rate of the main pump can be taken. In this known embodiment is disadvantageous that heat is generated in the functional operation by the throttle, not only as Power loss but also leads to a warming of the hydraulic medium with associated cooling problems.

In der Druckschrift US-A-3431856 ist ein hydraulisches System mit zwei Pumpen beschrieben, die durch ein Umschaltventil wahlweise in Parallelschaltung oder Reihenschaltung schaltbar sind und in eine gemeinsame Ausgangsleitung fördern. Die erste und die zweite Pumpe sind durch einen gemeinsamen Antriebsmotor antreibbar und als druckkompensierte Pumpen ausgeführt, so dass der von den Pumpen zur Verfügung gestellte Ausgangsdruck im Wesentlichen konstant gehalten wird. Die Variabilität der Pumpen beschränkt sich dabei auf ein Einstellen der jeweiligen Fördermenge zum Konstanthalten des Drucks.In the publication US-A-3431856 is described a hydraulic system with two pumps, which are switched by a switching valve either in parallel or series connection and promote in a common output line. The first and the second pump are drivable by a common drive motor and designed as pressure-compensated pumps, so that the output pressure provided by the pump is kept substantially constant. The variability of the pumps is limited to an adjustment of the respective delivery rate to keep the pressure constant.

Aus der GB 2150981A ist ein Verfahren sowie eine Vorrichtung zum Fördern von Fluid zu entnehmen, wobei eine erste und eine zweite Pumpe vorgesehen sind, welche Fluid aus einem Vorratsbehälter zu einem Leitungsende hin fördern. Dabei ist die erste Pumpe und die zweite Pumpe jeweils durch eine Einstellvorrichtung verstellbar, die durch eine programmierbare Steuereinrichtung ansteuerbar ist. Es ist der Zweck dieses vorbekannten hydraulischen Systems, einen möglichst gleichmäßigen Austritt der aus einem Vorratsbehälter herausgepumpten Flüssigkeit an dem Leitungsende sicherzustellen.From the GB 2150981A is to remove a method and a device for conveying fluid, wherein a first and a second pump are provided, which convey fluid from a reservoir to a line end. In this case, the first pump and the second pump are each adjustable by an adjusting device which can be controlled by a programmable control device. It is the purpose of this prior art hydraulic system to ensure the most even possible discharge of the pumped out of a reservoir liquid at the line end.

Der Erfindung liegt die Aufgabe zugrunde, ein hydraulisches System der eingangs angegebenen Art so auszugestalten, daß ein hoher Wirkungsgrad des Systems erreichbar ist.The invention has the object of providing a hydraulic system of the type described 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 Verstellvorrichtung zum Verstellen des Fördervolumens auf, wobei die Vordruckpumpe unter Berücksichtigung von Steuer- oder Regelsignalen wenigstens eines Verbrauchers gesteuert oder geregelt ist. 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 bekannten System nach WO 99/61796 durch die verstellbare Drossel vorhanden ist, entfällt bei der erfindungsgemäßen Ausgestaltung.In the hydraulic system according to the invention, the pre-pressure pump has an adjusting device for adjusting the Delivery volume, wherein the pre-pressure pump is controlled or regulated taking into account control or control signals of at least one consumer. This embodiment according to the invention is advantageous with regard to several aspects. On the one hand, the suction pressure of the main pump can be increased or optimized and losses resulting therefrom reduce and thus increase the efficiency and performance of the main pump and the system. A flow resistance and a resulting loss, as in the known system according to WO 99/61796 is present by the adjustable throttle, is omitted in the embodiment of 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 Verstellvorrichtung der Vordruckpumpe eine Steuer- oder Regeleinrichtung zugeordnet, die vorzugsweise automatisch funktioniert.In the context of the invention, it is possible to perform an adjustment of the pre-pressure pump and a determination or positioning in the set position manually or by means of a control or regulating device. In the first case, it only requires an adjustment mechanism of the pre-pressure pump, which is manually operable. In the second case, the adjustment of the pre-pressure pump is associated with a control or regulating device, which preferably operates automatically.

In den Unteransprüchen sind unter anderem Merkmale enthalten, die die Ausnutzung verschiedener Steuer- und Regelmerkmale ermöglichen.In the subclaims include features that allow the use of various control and regulating features.

Es ist im Rahmen der Erfindung auch möglich, die Fördermengen der Vordruck- und Hauptpumpe auf günstige Verhältnisse abzustimmen, z. B. so zu steuern oder zu regeln, daß das Fördermengenverhältnis immer gleich ist.It is within the scope of the invention also possible to tailor the flow rates of the form and main pump to favorable conditions, for. B. to control or regulate that the flow rate ratio is always the same.

Hierdurch wird ein konstanter Ansaugdruck für die Hauptpumpe erreicht, und es werden durch unterschiedlich große Ansaugdrucke hervorgerufene Schwankungen der Fördermenge der Hauptpumpe vermieden.As a result, a constant suction pressure for the main pump is achieved, and it will be avoided by different suction pressure caused fluctuations in the flow rate of the main pump.

Nachfolgend werden die Erfindung und weitere durch sie erzielbare Vorteile anhand von vorteilhaften Ausgestaltungen von Ausführungsbeispielen und vereinfachten Zeichnungen näher erläutert. Es zeigen

Fig. 1
ein erfindungsgemäßes hydraulisches System als Funktionsplan;
Fig. 2
das System in abgewandelter Ausgestaltung.
The invention and further achievable by them advantages are explained in more detail with reference to advantageous embodiments of exemplary embodiments and simplified drawings. Show it
Fig. 1
a hydraulic system according to the invention as a function diagram;
Fig. 2
the system in a modified embodiment.

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 Verstellvorrichtung 6 auf, die durch eine erste Steuer- oder Regeleinrichtung 7 verstellbar und in der verstellten bzw. eingestellten Position feststellbar ist.In the entirety designated 1 hydraulic system extends from a tank 2, a suction line 3 to the input 4 of a pre-pressure pump 5, the delivery volume is adjustable. The pre-pressure pump 5 has an adjusting device 6, which can be adjusted by a first control or regulating device 7 and in the adjusted or set position.

Vom Ausgang 8 der Vordruckpumpe 5 erstreckt sich eine Verbindungsleitung 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.From the output 8 of the priming pump 5, a connecting line 9 extends to the input 11 of a main pump 12, the delivery volume 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 Verstellvorrichtungen 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 type of construction or function of the Pumpen'5, 12. This also applies to the adjusting devices 6, 13 and the control and regulating devices 7, 14. These may be of one of the known construction and functional types. The pumps can each be, for example, a vane pump, radial piston pump or preferably axial piston pump. The pumps 5, 12 may be pressure controlled or flow rate controlled or power controlled. The Control devices 7, 14 may have a pressure regulator or flow 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 aforesaid control or regulating functions are controlled or regulated by the associated control or regulating device 7, 14 taking into account control or regulating signals which are supplied to the control or regulating device 7, 14 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. Fig. 1 shows a control or signal line 15, which extends from one of the output 16 of the main pump 12 to a consumer A extending working pressure line 17 to the second control or regulating device 14. This may be, for example, a pressure signal for a pressure regulator or a flow rate signal for a flow regulator or a pressure and flow rate 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.Also, pressure signals or flow rate signals from the priming pump may be supplied to a pressure regulator or flow regulator of the first controller 7, e.g. by a control or signal line 18, which connects the connecting line 9 with the first control or regulating device 7. It is also possible to supply these signals also or only to the pressure regulator or flow regulator or power regulator of the second control device 14, which is illustrated by a connected to the second control device 14 control or signal line branch 18a.

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 diesem Fall kann der Steuer- bzw. Signalleitungszweig 18b entfallen.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. Here, the first control or regulating device 7 corresponding signals from the second control or regulating device 14 are transmitted, for example, by a signal line connecting them 19. In this case, the control or signal line branch 18b omitted.

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 Steuer- oder Regeleinrichtung 14 und/oder der ersten Steuer- oder Regeleinrichtung 7 zuzuführen, was durch die Signalleitungszweige 20a, 20b verdeutlicht ist.The control signals may also be supplied by the consumer A to the first controller 7 and / or the second controller 14, e.g. by signal lines which connect the consumer A respectively to the first and / or second control or regulating device 7, 14. It is also possible that two consumers B, C e.g. a device are present, from which the control or regulating signals of the 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 regulating device 7 are supplied, e.g. by the signal lines 20, 21. Here, too, it is possible to supply the signals of the consumer B and / or C of the second control or regulating device 14 and / or the first control or regulating device 7, which is illustrated by the signal line branches 20a, 20b ,

Der zweite Verbraucher C kann durch einen Verbindungsleitungszweig 9a mit der Verbindungsleitung 9 verbunden sein und somit daraus gespeist werden.The second consumer C may be connected by a connecting line branch 9a to the connecting line 9 and thus 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 Verstellvorrichtungen 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 embodiment according to Fig. 2 , in which the same or comparable parts are provided with the same reference numerals, the priming pump 5 in response to the main pump 12 by the adjusting devices 6, 13 interconnecting mechanical coupling 22 to control or regulate. If the adjusting devices 6, 13 are formed by pivoting devices, the coupling 22 may be formed, for example, by a connecting rod 22a, which is pivotally connected to the pivoting devices or with their pivoting levers. Such an embodiment is in Fig. 2 shown.

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 Einstellungs- 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.When 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 ratio, for example the same Swivel angle. In this case, the pressure in the connecting line 9 and thus the suction pressure of the main pump 12 is always constant. In contrast, in a independent of the main pump 12 control or regulation of the priming pump 5, the pressure in the connecting line 9 and thus also the suction pressure of the main pump 12 depending on the adjustment of the admission pressure pump 5 different.

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 Steuer- oder 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 realize an adjustment deviating from a synchronous adjustment of the priming pump 5, e.g. a deviating according to a certain characteristic adjustment. This can e.g. by a suggestively illustrated gear 23 or a motor integrated in the mechanical coupling 22 and e.g. may be connected by a control or signal line 24 to the second control or regulating device 14. The gear 23 or the engine can, for. B. be integrated into the mechanical coupling 22 and in the connecting rod 22 a that they their effective length, d. h., increase the distance of the connection or hinge points, in the desired manner or shorten.

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 Verbindungsleitung 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.It is also possible in all embodiments in the further, between the connecting line 9 and the tank 2 to provide a hydraulic compensation connection 25 or overflow, which makes it possible, if the delivery rates of the pump 5, 12 are not the same size, an overflow of the 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 admission pressure pump 5, hydraulic fluid can flow to the tank 2 when the admission pressure pump 5 is bypassed. On the other hand, it is also possible to suck hydraulic fluid to the connection line 9, bypassing the admission pressure pump 5, when the delivery rate of the main pump 12 is greater than that of the admission pressure pump 5. To make this possible, for example, two bypasses formed by hydraulic lines and bypassing the admission pressure pump 5 can be provided 26, 27 are formed, which is the connecting line 9 with the tank 2 or with the suction line 3 connect. In the by-passes 26, 27 is in each case a valve 28, 29, preferably a check valve, arranged, of which one valve 28 allows to suck hydraulic fluid to the connecting line 9, while the other valve 29 allows hydraulic fluid from the connecting line 9 to Tank 2 or to the suction line 3 to flow. The bypasses 26, 27 may 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.It is also possible in all embodiments, furthermore, to arrange the admission pressure pump 5 separately from the main pump 12 or to grow it on the main pump 5 or to integrate it into the main adjustment system, e.g. to integrate into the main pump 12.

Claims (17)

  1. Hydraulic system (1) comprising a main pump (12) and an admission-pressure pump (5), wherein the outlet (8) of the admission-pressure pump (5) is connected by a connection line (9) to the inlet (11) of the main pump (12), wherein the outlet (16) of the main pump (12) is connectable by a working line (17) to a consumer (A, B), and wherein the volumetric flow at the inlet (11) of the main pump (12) is variable,
    characterized in
    that the admission-pressure pump (5) has an adjusting apparatus (6) for adjusting its delivery quantity and that the admission-pressure pump (5) is controlled or regulated while taking account of control or regulating signals of at least one consumer (A, B).
  2. Hydraulic system according to claim 1,
    characterized in
    that the main pump (12) also has an adjusting apparatus (13) for adjusting its delivery quantity.
  3. Hydraulic system according to claim 1 or 2,
    characterized in
    that the adjusting apparatus (6) of the admission-pressure pump (5) and/or the adjusting apparatus (13) of the main pump (12) is/are each individually or jointly manually controllable or regulable and/or settable.
  4. Hydraulic system according to claim 1 or 2,
    characterized in
    that the adjusting apparatus (6) of the admission-pressure pump (5) and/or the adjusting apparatus (13) of the main pump (12) are controllable or regulable by means of an, in each case, associated control or regulating device (14) or a common control or regulating device (14).
  5. Hydraulic system according to claim 4,
    characterized in
    that the main pump (12) is controlled or regulated while taking account of the pressure in the working line (17) and/or of the pressure in the connection line (9).
  6. Hydraulic system according to claim 4 or 5,
    characterized in
    that the admission-pressure pump (5) is controlled or regulated while taking account of the pressure in the working line (17) and/or of the pressure in the connection line (9).
  7. Hydraulic system according to one of the preceding claims,
    characterized in
    that the main pump (12) is controlled or regulated while taking account of control or regulating signals of at least one consumer (A, B).
  8. Hydraulic system according to one of claims 4 to 6,
    characterized in
    that the first regulating device (7) or the second regulating device (14) or the common regulating device (14) comprises a pressure regulator.
  9. Hydraulic system according to one of claims 4 to 6 or 8,
    characterized in
    that the first regulating device (7) or the second regulating device (14) or the common regulating device (14) comprises a delivery quantity regulator.
  10. Hydraulic system according to one of the preceding claims 4 to 6 or 8 or 9,
    characterized in
    that the first regulating device (7) or the second regulating device (14) or the common regulating device (14) comprises a capacity regulator.
  11. Hydraulic system according to one of the preceding claims,
    characterized in
    that the admission-pressure pump (5) is synchronously controlled or regulated in dependence upon the main pump (12).
  12. Hydraulic system according to claim 11,
    characterized in
    that the adjusting apparatuses (6, 13) of the admission-pressure pump (5) and of the main pump (12) are coupled to one another by a preferably mechanical coupling (22).
  13. Hydraulic system according to one of the preceding claims,
    characterized in
    that the first connection line (9) has a connection line branch (9a) for connection to a second consumer (C).
  14. Hydraulic system according to one of claims 4 to 6, 8, 9 or 10,
    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 (12) or a common control or regulating device (14) take(s) account of function signals of the consumer (A) or of the, in each case, associated consumer (B, C).
  15. Hydraulic system according to one of the preceding claims,
    characterized in
    that a compensating apparatus (25) for the hydraulic medium is provided between the connection line (9) or the connection line branch (9a) and the tank (2) or the suction line (3).
  16. Hydraulic system according to claim 15,
    characterized in
    that the compensating apparatus (25) is formed by a bypass (26, 27), which bypasses the admission-pressure pump (5) and in which is disposed a valve (28, 29), in particular a non-return valve, which permits a flow in the one flow direction and blocks a flow in the other flow direction.
  17. Hydraulic system according to claim 16,
    characterized in
    that two bypasses (26, 27) are provided, the valves (28, 29) of which open and block in mutually opposite flow directions.
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)

Application Number Priority Date Filing Date Title
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

Publications (2)

Publication Number Publication Date
EP1317624A1 EP1317624A1 (en) 2003-06-11
EP1317624B1 true EP1317624B1 (en) 2008-03-12

Family

ID=7655960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01956507A Expired - Lifetime EP1317624B1 (en) 2000-09-13 2001-06-29 Hydraulic system comprising a main pump and a precompression pump

Country Status (5)

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US (1) US6997685B2 (en)
EP (1) EP1317624B1 (en)
JP (1) JP5016776B2 (en)
DE (2) DE10045118B4 (en)
WO (1) WO2002023041A1 (en)

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DE50113730D1 (en) 2008-04-24
JP5016776B2 (en) 2012-09-05
DE10045118B4 (en) 2006-02-09
WO2002023041A1 (en) 2002-03-21
JP2004509269A (en) 2004-03-25
EP1317624A1 (en) 2003-06-11
US6997685B2 (en) 2006-02-14
US20030185687A1 (en) 2003-10-02
DE10045118A1 (en) 2002-03-28

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