EP2463528A2 - Valve unit - Google Patents

Valve unit Download PDF

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Publication number
EP2463528A2
EP2463528A2 EP11008999A EP11008999A EP2463528A2 EP 2463528 A2 EP2463528 A2 EP 2463528A2 EP 11008999 A EP11008999 A EP 11008999A EP 11008999 A EP11008999 A EP 11008999A EP 2463528 A2 EP2463528 A2 EP 2463528A2
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EP
European Patent Office
Prior art keywords
valve
hydraulic
valve unit
valves
unit
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
EP11008999A
Other languages
German (de)
French (fr)
Other versions
EP2463528B1 (en
EP2463528A3 (en
Inventor
Simon Meier
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.)
Liebherr Hydraulikbagger GmbH
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Liebherr Hydraulikbagger GmbH
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Publication of EP2463528A2 publication Critical patent/EP2463528A2/en
Publication of EP2463528A3 publication Critical patent/EP2463528A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F15B1/0275—Installations or systems with accumulators having accumulator charging devices with two or more pilot valves, e.g. for independent setting of the cut-in and cut-out pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5156—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a return line and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6653—Pressure control

Definitions

  • the present invention relates to a valve unit for a hydraulic system and a hydraulic assembly and a construction vehicle.
  • hydraulic accumulator which are essentially hydraulic accumulator for pressurized hydraulic fluid such.
  • hydraulic oil are used, often in conjunction with a hydraulic consumer such.
  • a valve unit with the features of claim 1. Thereafter, it is provided that a valve unit is designed for a hydraulic arrangement with at least three valves and at least one actuating means, wherein the valves and the actuating means indirectly and / or directly connected to each other and / or are connected, wherein in at least one operating state downstream of the first valve, the two further valves are arranged in parallel and wherein at least one actuating signal can be transmitted to at least one of the valves by means of the actuating means.
  • valve unit can be easily controlled in order to allow a pressure readjustment in a simple form, for example, in a strongly moving hydraulic accumulator, for example, downstream of the valve unit, that is arranged downstream of the valve unit. In particular, it is no longer necessary to provide a control loop.
  • At least one actuating signal can be transmitted to all valves of the valve unit by means of the actuating means and / or that the opening state of at least one valve can be changed and / or adjusted on the basis of the actuating signal.
  • a connection means is provided, by means of which the valve unit is indirectly and / or directly connectable to a hydraulic pumping means.
  • a connection means is provided, by means of which the valve unit indirectly and / or directly to a hydraulic consumer and / or Hydraulic storage is connectable.
  • a connection means is provided, by means of which the valve unit indirectly and / or directly connected to a hydraulic fluid reservoir is.
  • a hydraulic fluid reservoir may for example be a hydraulic tank for the hydraulic oil.
  • the adjusting means is a control unit and / or comprises and wherein at least one control signal can be generated by means of the control unit.
  • the adjusting means is a mechanical, hydraulic and / or electrical actuating means, by means of which at least one mechanical, hydraulic and / or electrical actuating signal can be generated.
  • a pressure can be controlled, which is proportional to the control signal.
  • This pressure can be, for example, the pressure in a hydraulic accumulator of a hydraulic system.
  • At least one valve preferably all the valves of the valve unit, has at least one spring means, by means of which the opening state of the valve can be influenced, preferably thereby indirectly and / or directly the switch-on, the pressure increase of the fluid flowing through the valve and / or an artificial hysteresis of the valve is adjustable.
  • At least one valve preferably all valves of the valve unit or particularly advantageously only the second valve, which is one of the two valves arranged parallel and downstream of the first valve, can be blocked. This advantageously results in the possibility of being able to switch on the pressure readjustment if necessary. It is thus possible to be able to set the pressure in a hydraulic accumulator or accumulator of a hydraulic arrangement "black / white" arranged downstream of the valve unit.
  • a hydraulic arrangement comprises at least one valve unit according to one of claims 1 to 8, wherein the hydraulic arrangement in particular further at least one hydraulic accumulator, a hydraulic consumer, wherein the hydraulic consumer
  • a hydraulic cylinder for example, a hydraulic cylinder, a hydraulic pumping means, a pressure measuring means and / or a hydraulic fluid reservoir.
  • the present invention relates to a construction vehicle with the features of claim 10. Thereafter, it is provided that a construction vehicle with at least one valve system according to claim 1 to 8 and / or a hydraulic arrangement according to claim 9 is provided.
  • FIG. 1 shows a schematic representation of a hydraulic assembly 10 with a valve unit 100.
  • This valve unit 100 has three ports 110, 120 and 130, by means of which the valve unit 100 to a pump 200, to a memory 300 and a hydraulic oil reservoir 400 and a hydraulic tank 400 can be connected ,
  • the pump 200 delivers hydraulic oil via the port 110 of the valve unit 100 into the valve unit 100.
  • the port 110 leads the hydraulic oil to a first valve 140, which has a spring 142.
  • the switch-on, the slope, artificial hysteresis, etc. of the valve 140 can be adjusted.
  • a second valve 150 and a third valve 160 are provided in parallel arrangement.
  • the second and the third valve 150, 160 each have springs 152 and 162, by means of which the valves 150 and 160 as well as the valve 140, which is adjustable by means of the spring means 142, with respect to switch-on point, pitch, artificial hysteresis, etc. adjustable are.
  • a pressure gauge 320 is further provided, by means of which the pressure in the line 310 and in the memory 300 can be measured. On the basis of this determined value, for example, automatically or machine side, as detected by the control of the hydraulic assembly 10 be that a readjustment of the memory pressure of the memory 300 is required.
  • the memory 300 is preferably a hydraulic accumulator 300 for an energy-saving cylinder 500, which is shown here by way of example as a hydraulic consumer 500.
  • valve unit 100 which can also be referred to as a readjustable charging valve unit 100 or a readjustable charging valve 100 for simplicity
  • a control signal or a manipulated variable X is preset by means of a control unit or actuating unit, not shown, via corresponding signal transmission lines 190 is transferred to the valves 140, 150 and 160.
  • the valve unit 100 can then be controlled accordingly in order to adjust the pressure P in the memory 300 can.
  • the manipulated variable X is proportional to the pressure P in the memory 300.
  • the manipulated variable X may be a mechanical, hydraulic or electrical manipulated variable X. It can also be provided to open the valve 150 only above a certain threshold value X, ie to enable a readjustment of the pressure P in the memory 300 only after exceeding a threshold value of the manipulated variable X.
  • This relationship is for example in FIG. 2 shown. Like this in FIG. 2 is shown is only from a value X1, which here corresponds to about 5% of the maximum value of the manipulated variable X, a switching on or switching of the valve 150 allows. This relationship is represented by characteristic K150.
  • the characteristic curve K140 relates to the relationship of the manipulated variable X for the valve 140 and the pressure P. Analogously, this also applies to the characteristic K160, which describes the relationship of the manipulated variable X for the valve 160 and the pressure P.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

The valve unit (100) has three valves (140,150,160) and several adjusting units that are indirectly and/or directly connected to each other. The valves (150,160) are arranged in parallel with respect to operating state of valve (140), so that control signal (X) of valves is adjusted. An independent claim is included for hydraulic assembly.

Description

Die vorliegende Erfindung betrifft eine Ventileinheit für eine Hydraulikanordnung sowie eine Hydraulikanordnung und ein Baufahrzeug.The present invention relates to a valve unit for a hydraulic system and a hydraulic assembly and a construction vehicle.

Bei Baufahrzeugen, wie beispielsweise Hydraulikbaggern werden sogenannte Hydrospeicher, die im Wesentlichen Hydraulikspeicher für unter Druck gesetztes Hydraulikfluid wie z. B. Hydrauliköl sind, eingesetzt, und zwar oftmals im Zusammenhang mit einem hydraulischen Verbraucher wie z. B. einem hydraulischen Stellzylinder.In construction vehicles, such as hydraulic excavators so-called hydraulic accumulator, which are essentially hydraulic accumulator for pressurized hydraulic fluid such. As hydraulic oil are used, often in conjunction with a hydraulic consumer such. B. a hydraulic actuating cylinder.

Da die Kennlinie eines derartigen Hydrospeichers stark temperaturabhängig ist, ist es schwierig, bei einem stark bewegten Speicher mit unterschiedlichen Öltemperaturen, wie dies beispielsweise bei einem als Energiesparzylinder ausgeführten Stellzylinder eines Baufahrzeuges der Fall sein kann, auf der idealen Kennlinie zu bleiben.Since the characteristic curve of such a hydraulic accumulator is highly temperature-dependent, it is difficult to remain on the ideal characteristic curve in the case of a strongly moving accumulator having different oil temperatures, as may be the case, for example, in the case of a setting cylinder of a construction vehicle designed as an energy-saving cylinder.

Folglich ist es erforderlich, den Druck nachzujustieren.Consequently, it is necessary to readjust the pressure.

Die bisher hierzu bekannten Lösungsansätze zeichnen sich dadurch aus, dass umständlich und komplex eine Nachjustierung des Druckes bereit gestellt wird.The previously known approaches to this approach are characterized by the cumbersome and complex readjustment of the pressure.

Es ist daher Aufgabe der vorliegenden Erfindung, eine Ventileinheit für eine Hydraulikanordnung der eingangs genannten Art in vorteilhafter Weise weiterzubilden, insbesondere dahingehend, dass eine Drucknachjustierung bei Hydraulikanordnungen umfassend einen Hydrospeicher und einen hydraulischen Verbraucher auch bei einem stark bewegten Speicher mit unterschiedlichen Öltemperaturen einfach ermöglicht werden kann.It is therefore an object of the present invention to further develop a valve unit for a hydraulic arrangement of the type mentioned in an advantageous manner, in particular to the effect that a pressure readjustment in hydraulic systems comprising a hydraulic accumulator and a hydraulic consumer can be easily made even with a strong moving memory with different oil temperatures ,

Diese Aufgabe wird erfindungsgemäß gelöst durch eine Ventileinheit mit den Merkmalen des Anspruchs 1. Danach ist vorgesehen, dass eine Ventileinheit für eine Hydraulikanordnung mit wenigstens drei Ventilen und mit wenigstens einem Stellmittel ausgeführt ist, wobei die Ventile und das Stellmittel mittelbar und/oder unmittelbar miteinander verbindbar und/oder verbunden sind, wobei in wenigstens einem Betriebszustand stromabwärts des ersten Ventils die beiden weiteren Ventile parallel angeordnet sind und wobei mittels des Stellmittels wenigstens ein Stellsignal an wenigstens eines der Ventile übermittelbar ist.This object is achieved by a valve unit with the features of claim 1. Thereafter, it is provided that a valve unit is designed for a hydraulic arrangement with at least three valves and at least one actuating means, wherein the valves and the actuating means indirectly and / or directly connected to each other and / or are connected, wherein in at least one operating state downstream of the first valve, the two further valves are arranged in parallel and wherein at least one actuating signal can be transmitted to at least one of the valves by means of the actuating means.

Dadurch ergibt sich der Vorteil, dass die Ventileinheit einfach angesteuert werden kann, um beispielsweise bei einem stark bewegten Hydrospeicher, der beispielsweise der Ventileinheit nachgeordnet, also stromabwärts der Ventileinheit angeordnet wird, eine Drucknachjustierung in einfacher Form zu ermöglichen. Insbesondere ist es nicht mehr notwendig, einen Regelkreis vorzusehen.This results in the advantage that the valve unit can be easily controlled in order to allow a pressure readjustment in a simple form, for example, in a strongly moving hydraulic accumulator, for example, downstream of the valve unit, that is arranged downstream of the valve unit. In particular, it is no longer necessary to provide a control loop.

Des Weiteren kann vorgesehen sein, dass mittels des Stellmittels wenigstens ein Stellsignal an alle Ventile der Ventileinheit übermittelbar ist und/oder dass anhand des Stellsignals der Öffnungszustand wenigstens eines Ventils veränderbar und/oder einstellbar ist.Furthermore, it can be provided that at least one actuating signal can be transmitted to all valves of the valve unit by means of the actuating means and / or that the opening state of at least one valve can be changed and / or adjusted on the basis of the actuating signal.

Ferner ist möglich, dass in wenigstens einem Betriebszustand stromaufwärts des ersten Ventils ein Anschlussmittel vorgesehen ist, mittels dessen die Ventileinheit mittelbar und/oder unmittelbar an ein Hydraulikpumpmittel anschließbar ist.It is also possible that in at least one operating state upstream of the first valve, a connection means is provided, by means of which the valve unit is indirectly and / or directly connectable to a hydraulic pumping means.

Weiter kann vorgesehen sein, dass in wenigstens einem Betriebszustand stromabwärts eines zweiten Ventils, das eines der beiden parallel und stromabwärts des ersten Ventils angeordneten Ventile ist, ein Anschlussmittel vorgesehen ist, mittels dessen die Ventileinheit mittelbar und/oder unmittelbar an einen hydraulischen Verbraucher und/oder Hydraulikspeicher anschließbar ist.It can further be provided that in at least one operating state downstream of a second valve, which is one of the two valves arranged parallel and downstream of the first valve, a connection means is provided, by means of which the valve unit indirectly and / or directly to a hydraulic consumer and / or Hydraulic storage is connectable.

Darüber hinaus ist weiter denkbar, dass in wenigstens einem Betriebszustand der Ventile stromabwärts eines dritten Ventils, das eines der beiden parallel und stromabwärts des ersten Ventils angeordneten Ventile ist, ein Anschlussmittel vorgesehen ist, mittels dessen die Ventileinheit mittelbar und/oder unmittelbar an ein Hydraulikflüssigkeitsreservoir anschließbar ist. Ein derartiges Hydraulikflüssigkeitsreservoir kann beispielsweise ein Hydrauliktank für das Hydrauliköl sein.Moreover, it is further conceivable that in at least one operating state of the valves downstream of a third valve, which is one of the two valves arranged parallel and downstream of the first valve, a connection means is provided, by means of which the valve unit indirectly and / or directly connected to a hydraulic fluid reservoir is. Such a hydraulic fluid reservoir may for example be a hydraulic tank for the hydraulic oil.

Außerdem ist denkbar, dass das Stellmittel eine Steuereinheit ist und/oder umfasst und wobei mittels der Steuereinheit wenigstens ein Stellsignal erzeugbar ist.It is also conceivable that the adjusting means is a control unit and / or comprises and wherein at least one control signal can be generated by means of the control unit.

Es kann vorgesehen sein, dass das Stellmittel ein mechanisches, hydraulisches und/oder elektrisches Stellmittel ist, mittels dessen wenigstens ein mechanisches, hydraulisches und/oder elektrisches Stellsignal erzeugbar ist.It can be provided that the adjusting means is a mechanical, hydraulic and / or electrical actuating means, by means of which at least one mechanical, hydraulic and / or electrical actuating signal can be generated.

Darüber hinaus kann vorgesehen sein, dass mittels der Ventileinheit ausgangsseitig der Ventileinheit ein Druck ansteuerbar ist, der proportional zum Stellsignal ist. Dieser Druck kann beispielsweise der Druck in einem Hydrospeicher einer Hydraulikanordnung sein.In addition, it can be provided that by means of the valve unit on the output side of the valve unit, a pressure can be controlled, which is proportional to the control signal. This pressure can be, for example, the pressure in a hydraulic accumulator of a hydraulic system.

Weiter ist möglich, dass wenigstens ein Ventil, vorzugsweise alle Ventile der Ventileinheit, wenigstens ein Federmittel aufweist, mittels dessen der Öffnungszustand des Ventils beeinflussbar ist, wobei vorzugsweise hierdurch mittelbar und/oder unmittelbar der Einschaltpunkt, der Druckanstieg des durch das Ventil strömenden Fluids und/oder eine künstliche Hysterese des Ventils einstellbar ist.It is also possible that at least one valve, preferably all the valves of the valve unit, has at least one spring means, by means of which the opening state of the valve can be influenced, preferably thereby indirectly and / or directly the switch-on, the pressure increase of the fluid flowing through the valve and / or an artificial hysteresis of the valve is adjustable.

Durch die Möglichkeit, mittelbar und/oder unmittelbar den Einschaltpunkt, den Druckanstieg des durch das Ventil strömenden Fluids und/oder eine künstliche Hysterese des Ventils einstellen zu können, ergibt sich der Vorteil, eine optimale Anpassung an die Anforderungen des hydraulischen Verbrauchers einer entsprechenden Hydraulikanordnung vornehmen zu können.The possibility of being able to indirectly and / or directly set the switch-on point, the pressure rise of the fluid flowing through the valve and / or an artificial hysteresis of the valve affords the advantage of optimally adapting to the requirements of the hydraulic consumer of a corresponding hydraulic arrangement to be able to.

Des Weiteren kann vorgesehen sein, dass wenigstens ein Ventil, vorzugsweise alle Ventile der Ventileinheit oder besonders vorteilhaft nur das zweite Ventil, das eines der beiden parallel und stromabwärts des ersten Ventils angeordneten Ventile ist, sperrbar ist. Dadurch ergibt sich vorteilhafterweise die Möglichkeit, die Drucknachjustierung bei Bedarf zuschalten zu können. Es ist also möglich, den Druck in einem stromabwärts der Ventileinheit angeordneten Hydrospeicher bzw. Druckspeicher einer Hydraulikanordnung "schwarz/weiß" einstellen zu können.Furthermore, it can be provided that at least one valve, preferably all valves of the valve unit or particularly advantageously only the second valve, which is one of the two valves arranged parallel and downstream of the first valve, can be blocked. This advantageously results in the possibility of being able to switch on the pressure readjustment if necessary. It is thus possible to be able to set the pressure in a hydraulic accumulator or accumulator of a hydraulic arrangement "black / white" arranged downstream of the valve unit.

Ferner betrifft die vorliegende Erfindung eine Hydraulikanordnung mit den Merkmalen des Anspruchs 9. Danach ist vorgesehen, dass eine Hydraulikanordnung wenigstens eine Ventileinheit nach einem der Ansprüche 1 bis 8 umfasst, wobei die Hydraulikanordnung insbesondere weiter wenigstens einen Hydraulikspeicher, einen hydraulischen Verbraucher, wobei der hydraulische Verbraucher beispielsweise ein Hydraulikzylinder ist, ein Hydraulikpumpmittel, ein Druckmessmittel und/oder ein Hydraulikflüssigkeitsreservoir aufweist.Furthermore, the present invention relates to a hydraulic arrangement with the features of claim 9. Thereafter, it is provided that a hydraulic arrangement comprises at least one valve unit according to one of claims 1 to 8, wherein the hydraulic arrangement in particular further at least one hydraulic accumulator, a hydraulic consumer, wherein the hydraulic consumer For example, a hydraulic cylinder, a hydraulic pumping means, a pressure measuring means and / or a hydraulic fluid reservoir.

Des Weiteren betrifft die vorliegende Erfindung ein Baufahrzeug mit den Merkmalen des Anspruchs 10. Danach ist vorgesehen, dass ein Baufahrzeug mit wenigstens einem Ventilsystem nach Anspruch 1 bis 8 und/oder eine Hydraulikanordnung nach Anspruch 9 versehen ist.Furthermore, the present invention relates to a construction vehicle with the features of claim 10. Thereafter, it is provided that a construction vehicle with at least one valve system according to claim 1 to 8 and / or a hydraulic arrangement according to claim 9 is provided.

Weitere Einzelheiten und Vorteile der Erfindung sollen nun anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert werden. Es zeigen:

Figur 1:
eine schematische Darstellung einer Hydraulikanordnung umfassend eine erfindungsgemäße Ventileinheit; und
Figur 2:
ein Diagramm betreffend den Zusammenhang zwischen Druck (im Hydrospeicher) und Stellsignal X.
Further details and advantages of the invention will now be explained in more detail with reference to an embodiment shown in the drawing. Show it:
FIG. 1:
a schematic representation of a hydraulic system comprising a valve unit according to the invention; and
FIG. 2:
a diagram relating to the relationship between pressure (in the hydraulic accumulator) and control signal X.

Figur 1 zeigt in schematischer Darstellung eine Hydraulikanordnung 10 mit einer Ventileinheit 100. Diese Ventileinheit 100 weist drei Anschlüsse 110, 120 und 130 auf, mittels derer die Ventileinheit 100 an eine Pumpe 200, an einen Speicher 300 sowie ein Hydraulikölreservoir 400 bzw. einen Hydrauliktank 400 anschließbar ist. FIG. 1 shows a schematic representation of a hydraulic assembly 10 with a valve unit 100. This valve unit 100 has three ports 110, 120 and 130, by means of which the valve unit 100 to a pump 200, to a memory 300 and a hydraulic oil reservoir 400 and a hydraulic tank 400 can be connected ,

Aus dem Reservoir 400 fördert die Pumpe 200 Hydrauliköl über den Anschluss 110 der Ventileinheit 100 in die Ventileinheit 100 hinein. Der Anschluss 110 führt das Hydrauliköl zu einem ersten Ventil 140, das eine Feder 142 aufweist. Durch die Feder 142 kann der Einschaltpunkt, die Steigung, künstliche Hysterese etc. des Ventils 140 eingestellt werden. Stromabwärts des Ventils 140 sind in paralleler Anordnung ein zweites Ventil 150 und ein drittes Ventil 160 vorgesehen.From the reservoir 400, the pump 200 delivers hydraulic oil via the port 110 of the valve unit 100 into the valve unit 100. The port 110 leads the hydraulic oil to a first valve 140, which has a spring 142. By the spring 142, the switch-on, the slope, artificial hysteresis, etc. of the valve 140 can be adjusted. Downstream of the valve 140, a second valve 150 and a third valve 160 are provided in parallel arrangement.

Auch das zweite und das dritte Ventil 150, 160 weisen jeweils Federn 152 bzw. 162 auf, mittels derer die Ventile 150 und 160 ebenso wie das Ventil 140, das mittels des Federmittels 142 einstellbar ist, hinsichtlich Einschaltpunkt, Steigung, künstliche Hysterese etc. einstellbar sind.Also, the second and the third valve 150, 160 each have springs 152 and 162, by means of which the valves 150 and 160 as well as the valve 140, which is adjustable by means of the spring means 142, with respect to switch-on point, pitch, artificial hysteresis, etc. adjustable are.

Die stromabwärts an das Ventil 140 anschließende Hydraulikleitung 170 teilt sich stromabwärts des Ventils 140 auf und führt sowohl zum Ventil 150 mit der Leitung 172 und zum Ventil 160 mit der Leitung 174. Stromabwärts des Ventils 150 befindet sich der Anschluss 120, an dem die Versorgungsleitung 310 angeschlossen ist, die zum Speicher 300 führt. An der Versorgungsleitung 310 ist ferner ein Druckmesser 320 vorgesehen, mittels dessen der Druck in der Leitung 310 bzw. im Speicher 300 messbar ist. Anhand dieses ermittelten Wertes kann beispielsweise automatisch bzw. maschinenseitig, etwa durch die Steuerung der Hydraulikanordnung 10 erkannt werden, dass eine Nachjustierung des Speicherdruckes des Speichers 300 erforderlich ist. Bei dem Speicher 300 handelt es sich vorzugsweise um einen Hydrospeicher 300 für einen Energiesparzylinder 500, der hier beispielhaft als hydraulischer Verbraucher 500 angezeichnet ist.The downstream of the valve 140 hydraulic line 170 splits downstream of the valve 140 and leads both to the valve 150 with the line 172 and the valve 160 with the line 174. Downstream of the valve 150 is the port 120, at which the supply line 310th is connected, which leads to the memory 300. On the supply line 310, a pressure gauge 320 is further provided, by means of which the pressure in the line 310 and in the memory 300 can be measured. On the basis of this determined value, for example, automatically or machine side, as detected by the control of the hydraulic assembly 10 be that a readjustment of the memory pressure of the memory 300 is required. The memory 300 is preferably a hydraulic accumulator 300 for an energy-saving cylinder 500, which is shown here by way of example as a hydraulic consumer 500.

Über die Leitung 174 kann Hydraulikfluid durch das Ventil 160 geführt werden, wobei stromabwärts des Ventils 160 der Anschluss 130 vorgesehen ist, an den eine Leitung zum Hydraulikreservoir 400 angeschlossen ist.Via the line 174 hydraulic fluid can be passed through the valve 160, wherein downstream of the valve 160, the port 130 is provided, to which a line to the hydraulic reservoir 400 is connected.

Um eine Nachjustierung der Ventileinheit 100, die auch der Einfachheit halber als nachjustierbare Ladeventileinheit 100 oder als nachjustierbares Ladeventil 100 bezeichnet werden kann, vorzunehmen, wird mittels einer nicht näher dargestellten Steuereinheit bzw. Stelleinheit ein Stellsignal bzw. eine Stellgröße X vorgegeben, die über entsprechende Signalübertragungsleitungen 190 zu den Ventilen 140, 150 und 160 übertragen wird. Mittels dieser Stellgröße X kann sodann die Ventileinheit 100 entsprechend angesteuert werden, um den Druck P im Speicher 300 einstellen zu können. Die Stellgröße X ist dabei proportional zum Druck P im Speicher 300.In order to carry out a readjustment of the valve unit 100, which can also be referred to as a readjustable charging valve unit 100 or a readjustable charging valve 100 for simplicity, a control signal or a manipulated variable X is preset by means of a control unit or actuating unit, not shown, via corresponding signal transmission lines 190 is transferred to the valves 140, 150 and 160. By means of this manipulated variable X, the valve unit 100 can then be controlled accordingly in order to adjust the pressure P in the memory 300 can. The manipulated variable X is proportional to the pressure P in the memory 300.

Bei der Stellgröße X kann es sich um eine mechanische, hydraulische oder elektrische Stellgröße X handeln. Auch kann vorgesehen sein, erst ab einem gewissen Schwellwert X das Ventil 150 zu öffnen, also eine Nachjustierbarkeit des Drucks P im Speicher 300 erst ab einer Überschreitung eines Schwellwertes der Stellgröße X zu ermöglichen. Dieser Zusammenhang ist beispielsweise in Figur 2 dargestellt. Wie dies in Figur 2 gezeigt ist, ist erst ab einem Wert X1, der hier ca. 5 % des Maximalwertes der Stellgröße X entspricht, ein Einschalten bzw. Zuschalten des Ventils 150 ermöglicht. Dieser Zusammenhang ist dargestellt durch Kennlinie K150.The manipulated variable X may be a mechanical, hydraulic or electrical manipulated variable X. It can also be provided to open the valve 150 only above a certain threshold value X, ie to enable a readjustment of the pressure P in the memory 300 only after exceeding a threshold value of the manipulated variable X. This relationship is for example in FIG. 2 shown. Like this in FIG. 2 is shown is only from a value X1, which here corresponds to about 5% of the maximum value of the manipulated variable X, a switching on or switching of the valve 150 allows. This relationship is represented by characteristic K150.

Wie dies weiter aus Figur 2 hervorgeht, sind Zunahme von Stellgröße X und des Druckes P, d.h. des Druckes P im Speicher 300 bzw. Zylinder 500 proportional.Like this further FIG. 2 are apparent, are increase in manipulated variable X and the pressure P, ie the pressure P in the memory 300 and cylinder 500 proportional.

Die Kennlinie K140 betrifft dabei den Zusammenhang der Stellgröße X für das Ventil 140 und dem Druck P. Analog hierzu verhält es sich auch bei der Kennlinie K160, die den Zusammenhang der Stellgröße X für das Ventil 160 und dem Druck P beschreibt.The characteristic curve K140 relates to the relationship of the manipulated variable X for the valve 140 and the pressure P. Analogously, this also applies to the characteristic K160, which describes the relationship of the manipulated variable X for the valve 160 and the pressure P.

Insgesamt ergibt sich somit eine einfache Ansteuerung der Ventileinheit 100, da einem bestimmten Steuersignal X ein bestimmter Druck P zugeordnet wird, insbesondere ist einem Steuersignal X, das 30 % des Maximalwertes des Steuersignals X entspricht, ein Druck von 30 % des Maximaldrucks P zugeordnet. Daher ist es nicht notwendig, einen komplexen Regelkreis zur Nachjustierung und Regelung des Druckes P im Speicher 300 vorzusehen.Overall, this results in a simple control of the valve unit 100, as a certain control signal X is assigned a certain pressure P, in particular a control signal X, which corresponds to 30% of the maximum value of the control signal X, a pressure of 30% of the maximum pressure P assigned. Therefore, it is not necessary to provide a complex control circuit for readjusting and regulating the pressure P in the memory 300.

Claims (10)

Ventileinheit (100) für eine Hydraulikanordnung (10) mit wenigstens drei Ventilen (140, 150, 160) und mit wenigstens einem Stellmittel, wobei die Ventile (140, 150, 160) und das Stellmittel mittelbar und/oder unmittelbar miteinander verbindbar und/oder verbunden sind, wobei in wenigstens einem Betriebszustand stromabwärts eines ersten Ventils (140) die beiden weiteren Ventile (150, 160) parallel angeordnet sind und wobei mittels des Stellmittels wenigstens ein Stellsignal (X) an wenigstens eines der Ventile (140, 150, 160) übermittelbar ist.Valve unit (100) for a hydraulic arrangement (10) with at least three valves (140, 150, 160) and with at least one adjusting means, wherein the valves (140, 150, 160) and the adjusting means indirectly and / or directly connectable to each other and / or in at least one operating state downstream of a first valve (140) the two further valves (150, 160) are arranged in parallel and wherein by means of the actuating means at least one actuating signal (X) is applied to at least one of the valves (140, 150, 160) is transferable. Ventileinheit (100) nach Anspruch 1, dadurch gekennzeichnet, dass mittels des Stellmittels wenigstens ein Stellsignal (X) an alle Ventile (140, 150, 160) der Ventileinheit (100) übermittelbar ist und/oder dass anhand des Stellsignals der Öffnungszustand wenigstens eines der Ventile (140, 150, 160) veränderbar und/oder einstellbar ist.Valve unit (100) according to claim 1, characterized in that by means of the actuating means at least one control signal (X) to all valves (140, 150, 160) of the valve unit (100) can be transmitted and / or that based on the control signal, the opening state of at least one of Valves (140, 150, 160) is variable and / or adjustable. Ventileinheit (100) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in wenigstens einem Betriebszustand stromaufwärts des ersten Ventils (140) ein Anschlussmittel (110) vorgesehen ist, mittels dessen die Ventileinheit (100) mittelbar und/oder unmittelbar an ein Hydraulikpumpmittel (200) anschließbar ist und/oder dass stromabwärts eines zweiten Ventils (150), das eines der beiden parallel und stromabwärts des ersten Ventils (140) angeordneten Ventile (150, 160) ist, ein Anschlussmittel (120) vorgesehen ist, mittels dessen die Ventileinheit (100) mittelbar und/oder unmittelbar an einen hydraulischen Verbraucher (500) und/oder Hydraulikspeicher (300) anschließbar ist und/oder dass stromabwärts eines dritten Ventils (160), das eines der beiden parallel und stromabwärts des ersten Ventils (140) angeordneten Ventile (150, 160) ist, ein Anschlussmittel (130) vorgesehen ist, mittels dessen die Ventileinheit (100) mittelbar und/oder unmittelbar an ein Hydraulikflüssigkeitsreservoir (400) anschließbar ist.Valve unit (100) according to claim 1 or 2, characterized in that in at least one operating state upstream of the first valve (140) a connection means (110) is provided, by means of which the valve unit (100) indirectly and / or directly to a hydraulic pumping means (200 ) is connectable and / or that downstream of a second valve (150) which is one of the two parallel and downstream of the first valve (140) arranged valves (150, 160), a connection means (120) is provided, by means of which the valve unit ( 100) indirectly and / or directly to a hydraulic load (500) and / or hydraulic accumulator (300) is connectable and / or that downstream of a third valve (160), one of the two parallel and downstream of the first valve (140) arranged valves (150, 160), a connection means (130) is provided, by means of which the valve unit (100) indirectly and / or directly to a hydraulic fluid reservoir (400) is connectable. Ventileinheit (100) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Stellmittel eine Steuereinheit ist und/oder umfasst und wobei mittels der Steuereinheit das wenigstens eine Stellsignal (X) erzeugbar ist.Valve unit (100) according to any one of the preceding claims, characterized in that the adjusting means is a control unit and / or comprises and wherein by means of the control unit, the at least one control signal (X) can be generated. Ventileinheit (100) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Stellmittel ein mechanisches, hydraulisches und/oder elektrisches Stellmittel ist, mittels dessen wenigstens ein mechanisches, hydraulisches und/oder elektrisches Stellsignal (X) erzeugbar ist.Valve unit (100) according to one of the preceding claims, characterized in that the adjusting means is a mechanical, hydraulic and / or electrical actuating means, by means of which at least one mechanical, hydraulic and / or electrical actuating signal (X) can be generated. Ventileinheit (100) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mittels der Ventileinheit (100) ausgangsseitig der Ventileinheit (100) ein Druck einstellbar ist, der proportional zum Stellsignal ist.Valve unit (100) according to one of the preceding claims, characterized in that by means of the valve unit (100) on the output side of the valve unit (100), a pressure is adjustable, which is proportional to the control signal. Ventileinheit (100) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass wenigstens ein Ventil (140, 150, 160), vorzugsweise alle Ventile (140, 150, 160) der Ventileinheit, wenigstens ein Federmittel (142, 152, 162) aufweist, mittels dessen der Öffnungszustand des Ventils (140, 150, 160) beeinflussbar ist, wobei vorzugsweise hierdurch mittelbar und/oder unmittelbar der Einschaltpunkt, der Druckanstieg des durch das Ventil (140, 150, 160) strömenden Fluids und/oder eine künstliche Hysterese des Ventils (140, 150, 160) einstellbar ist.Valve unit (100) according to one of the preceding claims, characterized in that at least one valve (140, 150, 160), preferably all valves (140, 150, 160) of the valve unit, at least one spring means (142, 152, 162), by means of which the opening state of the valve (140, 150, 160) can be influenced, preferably thereby indirectly and / or directly the switch-on, the pressure increase of the fluid flowing through the valve (140, 150, 160) and / or an artificial hysteresis of the valve (140, 150, 160) is adjustable. Ventileinheit (100) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass wenigstens ein Ventil (140, 150, 160), vorzugsweise alle Ventile (140, 150, 160) der Ventileinheit (100) oder besonders vorteilhaft nur das zweite Ventil (150), das eines der beiden parallel und stromabwärts des ersten Ventils (140) angeordneten Ventile (150, 160) ist, sperrbar ist.Valve unit (100) according to one of the preceding claims, characterized in that at least one valve (140, 150, 160), preferably all valves (140, 150, 160) of the valve unit (100) or particularly advantageously only the second valve (150) , which is one of the two parallel and downstream of the first valve (140) arranged valves (150, 160) is lockable. Hydraulikanordnung (10) umfassend wenigstens eine Ventileinheit (100) nach einem der Ansprüche 1 bis 8, wobei die Hydraulikanordnung (10) insbesondere weiter wenigstens einen Hydraulikspeicher (300), einen hydraulischen Verbraucher (500), wobei der hydraulische Verbraucher (500) beispielsweise ein Hydraulikzylinder (500) ist, ein Hydraulikpumpmittel (200), ein Druckmessmittel (320) und/oder ein Hydraulikflüssigkeitsreservoir (400) aufweist.Hydraulic assembly (10) comprising at least one valve unit (100) according to one of claims 1 to 8, wherein the hydraulic assembly (10) in particular further at least one hydraulic accumulator (300), a hydraulic consumer (500), wherein the hydraulic consumer (500), for example Hydraulic cylinder (500) is, a hydraulic pumping means (200), a pressure measuring means (320) and / or a hydraulic fluid reservoir (400). Baufahrzeug mit einer Ventileinheit (100) nach Anspruch 1 bis 8 und/oder einer Hydraulikanordnung (10) nach Anspruch 9.Construction vehicle with a valve unit (100) according to claim 1 to 8 and / or a hydraulic arrangement (10) according to claim 9.
EP11008999.2A 2010-12-09 2011-11-11 Hydraulic assembly with valve unit Active EP2463528B1 (en)

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DE2052892B2 (en) * 1970-10-28 1973-08-09 Gesellschaft für Hydraulik-Zubehör mbH, 6603 Sulzbach PRESSURE ACCUMULATOR FOR HYDRAULIC SYSTEMS, IN PARTICULAR BLADDER OR PISTON ACCUMULATORS
DE4112065C2 (en) * 1991-04-12 1995-06-29 Rexroth Mannesmann Gmbh Pilot operated pressure cut-off valve with adjustable switching pressure difference
DE10062625A1 (en) * 2000-02-26 2001-10-11 Wabco Gmbh & Co Ohg Brake pressure modulator for electronic brake systems
DE102008040054A1 (en) * 2008-07-01 2010-01-07 Zf Friedrichshafen Ag Vehicle hydraulic system has an oil tank with a gas content in a pressure balance with the oil content, controlled according to temperature

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WO2018014905A1 (en) * 2016-07-21 2018-01-25 Schaeffler Technologies AG & Co. KG Method for maintaining a pressure level of a hydraulic fluid in a hydraulic actuator assembly

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