EP3462028A1 - Hydraulic assembly - Google Patents

Hydraulic assembly Download PDF

Info

Publication number
EP3462028A1
EP3462028A1 EP18197332.2A EP18197332A EP3462028A1 EP 3462028 A1 EP3462028 A1 EP 3462028A1 EP 18197332 A EP18197332 A EP 18197332A EP 3462028 A1 EP3462028 A1 EP 3462028A1
Authority
EP
European Patent Office
Prior art keywords
pump
hydraulic
unit
valve unit
arrangement according
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
EP18197332.2A
Other languages
German (de)
French (fr)
Other versions
EP3462028B1 (en
Inventor
Michael Meid
Sebastian TRAUT
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.)
Deere and Co
Original Assignee
Deere and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Publication of EP3462028A1 publication Critical patent/EP3462028A1/en
Application granted granted Critical
Publication of EP3462028B1 publication Critical patent/EP3462028B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • 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
    • F04B49/002—Hydraulic systems to change the pump delivery
    • 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
    • F04B49/06—Control using electricity
    • 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
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • 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
    • F04B49/22—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 by means of valves
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the pump

Definitions

  • the invention relates to a hydraulic arrangement with a pump for conveying a hydraulic medium in the direction of a hydraulic workload.
  • the pump of such a hydraulic arrangement usually delivers the hydraulic medium with discrete displacement volume. This can lead to volume flow and thus also to pressure pulsations, which are effectively reduced or avoided by a storage unit connected to the pump.
  • the storage unit may affect the hydraulic behavior of the assembly.
  • the hydraulic arrangement includes a pump for conveying a hydraulic medium (eg oil) in the direction of a hydraulic workload, which acts as a hydraulic consumer.
  • the pump is adjustable by means of an adjustment input, so that they can always provide an adapted flow rate or an adapted flow rate. As a result, the pump can work with respect to the hydraulic medium of a full funding up to a zero promotion.
  • the hydraulic arrangement contains a storage unit (eg diaphragm accumulator), which is hydraulically connected to the pump on the output side. This storage unit reduces any pressure pulsations and associated burdens of Components as well as disturbing noises of the hydraulic arrangement.
  • the hydraulic arrangement has a loading valve unit for loading and unloading the storage unit.
  • the charging valve unit is hydraulically connected at the pump on the output side between the pump and the storage unit and acts with their different switching states as a separable hydraulic connection between the pump and the storage unit.
  • the charging valve unit is bridged by means of a non-return valve which is permeable in the direction of the pump, wherein the non-return valve can be structurally integrated into the charging valve unit.
  • the check valve is closed.
  • Such a charging valve unit provides a technically simple and inexpensive condition for the hydraulic arrangement to exhibit a response at different operating ranges of the pump which is substantially independent of changes in the delivery flow. Any acoustic and / or mechanical vibrations in the hydraulic arrangement or in the hydraulic system are reduced or completely avoided, since a continuous filling and emptying of the storage unit can be actively damped by the charging valve unit.
  • the hydraulic arrangement is used in mobile hydraulics, such as in agricultural machines, construction machines or road construction vehicles.
  • the hydraulic workload is preferably contained in one of the aforementioned mobile machines or one of the aforementioned vehicles.
  • the hydraulic workload can be designed, for example, as a steering or braking unit, hydraulic motor, power lift cylinder be or be used in an attachment for one of the aforementioned machines or vehicles.
  • the loading valve unit has at least two, in particular exactly two different switching positions.
  • the loading valve unit is closed at a maximum delivery flow (full delivery) of the pump, while at a lower flow rate, i. below the maximum flow, is opened.
  • a hydraulic connection between the pump and the storage unit at a delivery flow below the maximum delivery flow.
  • the memory unit then fulfills the desired function for reducing pressure pulsations or for pulsation damping.
  • the pump In the case of a specific delivery flow or pressure requirement of the hydraulic system, the pump is adjusted in particular to full delivery. The loader unit then disconnects the storage unit from the hydraulic system, thereby preventing the storage unit from being filled. This leads to changes in the flow advantageous to a response of the hydraulic system without a memory unit, so that otherwise caused by a memory unit disadvantages such as reduced stiffness or vibration excitations in the hydraulic system can be avoided.
  • the storage unit may also reduce pressure drop due to abrupt volumetric flow or pressure requirements, especially when the loader unit is bridged by means of a non-return valve that is permeable to the pump.
  • the charging valve unit is technically simple in that it is closed in a pressureless state of a hydraulic control input and is open at a pressurized state of the control input with hydraulic pressure.
  • the charging unit can then be opened by means of a so-called pilot pressure at the control input.
  • the loader unit has a conventional spring side (e.g., return spring) while the aforesaid control input is located relative to the spring side on an opposite opposite side of the loader unit.
  • the charging valve unit is formed as a discrete or proportional 2/2-way valve with two ports and two switching positions and can thereby be provided inexpensively as a standard component. Notwithstanding, the directional control valve can also have an exceeding number of switching positions.
  • its adjustment input is preferably connected hydraulically to a regulator output of a hydraulic control unit.
  • control input of the charging valve unit is hydraulically connected to the same controller output to which the adjustment input of the pump is hydraulically connected.
  • control unit includes a hydraulic volume flow controller and / or a hydraulic pressure regulator.
  • the hydraulic system can request a hydraulic volume flow or pressure. This requirement is implemented in the pump by adjusting the flow rate, in particular by full promotion.
  • the volume flow regulator and / or the pressure regulator is preferably designed as a directional control valve, for example a 3/2-way valve.
  • its adjusting input preferably has a restoring element (for example return piston) which can be acted upon by hydraulic pressure.
  • a restoring element for example return piston
  • This adjustment pressure can be controlled by the control unit such that the pump provides the adjusted flow rate.
  • the pump can be adjusted by lowering the adjustment pressure in the direction of full delivery or by increasing the adjustment pressure in the direction of zero delivery.
  • Fig. 1 shows a hydraulic assembly 10 or hydraulic system with a pump 12 for conveying a hydraulic medium (eg oil) in the direction of a hydraulic workload 14.
  • a hydraulic medium eg oil
  • the pump 12 is connected to a suction line 16 to a Hydraulic medium containing hydraulic tank 18 and sump connected.
  • the pump 12 has an adjustment input to adjust a hydraulic flow.
  • the adjustment 20 has a return element 22 in the form of a return piston not shown in detail here.
  • This return element 22 is acted upon at a delivery flow below a full delivery with an adjustment pressure p_V.
  • the adjustment pressure p_V is controlled by a hydraulic volume flow controller 24 and a hydraulic pressure regulator 26 within a control unit 28 such that the pump 12 provides a correspondingly sized flow rate.
  • the pump 12 is adjusted by lowering the adjustment pressure towards full delivery or by increasing the adjustment pressure in the direction of zero promotion.
  • a storage unit 30 is hydraulically connected to the pump 12 on the output side. Between a pump outlet 32 of the pump 12 and a storage port 34 of the storage unit 30, a charging valve unit 36 is hydraulically connected.
  • the charging valve unit 36 is formed as a 2/2-way valve with two ports and two switching positions. By means of the loading valve unit 36, a separable hydraulic connection between the pump 12 and the storage unit 30 is made.
  • the charging valve unit 36 is bridged by means of a permeable in the direction of the pump 12 check valve, the check valve is structurally integrated into the charging valve unit 36.
  • the charging valve unit 36 is closed in the pressureless state of a hydraulic control input 38 and is opened at a pressure state of the control input 38 applied with hydraulic pressure (pilot pressure) p.
  • the control input 38 and the adjustment input 22 are hydraulically connected to a regulator output 40 of the control unit 28.
  • the return element 22 is always acted upon by a specific adjustment pressure p_V and thus limits the flow rate. Consequently, the control input 38 is acted upon by a specific pressure p and the charging valve unit 36 is opened accordingly.
  • the memory unit 30 fulfills the desired function of pulsation damping.
  • the pump 12 is adjusted by discharging the adjustment pressure p_V at the control input 20 to a full delivery (maximum flow).
  • the control input 38 is in a depressurized state and the charging valve unit 36 is accordingly closed.
  • the loading valve unit 36 separates the storage unit 30 from the hydraulic system, thereby preventing the storage unit 30 from being filled. This leads to a response of the hydraulic arrangement or the hydraulic system, which is comparable to a hydraulic system without such a memory unit 30. A negative reaction of the storage unit 30 to the hydraulic system can thus be excluded.
  • the hydraulic arrangement 10 also contains individual damping orifices 42 and 44, which are arranged hydraulically one behind the other between the control output 40 and the hydraulic reservoir 18.
  • the volume flow controller 24 and the pressure regulator 26 are each formed as a 3/2-way valve.
  • a so-called orifice plate 46 is hydraulically connected, at which the control pressure difference of the volume flow controller 24 drops.
  • the metering orifice 46 is so far a simplified control unit.
  • several such control units can be connected in parallel with corresponding workloads or consumers.
  • the metering orifice 46 or the control unit formed by these can be supplemented with a pressure compensator in order to keep the volume flow constant by adapting the control pressure difference applied to the metering orifice 46.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Die Erfindung betrifft eine hydraulische Anordnung (10) mit einer Pumpe (12) zum Fördern eines Hydraulikmediums in Richtung einer hydraulischen Arbeitslast (14). Die Pumpe (12) weist einen Verstelleingang (20) zur Verstellung eines Förderstromes der Pumpe (12) auf. An die Pumpe (12) ist ausgangsseitig eine Speichereinheit (30) hydraulisch angeschlossen. Eine Ladeventileinheit (36) ist an der Pumpe (12) ausgangsseitig zwischen der Pumpe (12) und der Speichereinheit (30) hydraulisch angeschlossen und wirkt als trennbare hydraulische Verbindung zwischen der Pumpe (12) und der Speichereinheit (30).The invention relates to a hydraulic arrangement (10) with a pump (12) for conveying a hydraulic medium in the direction of a hydraulic working load (14). The pump (12) has an adjustment input (20) for adjusting a delivery flow of the pump (12). On the output side, a storage unit (30) is hydraulically connected to the pump (12). A loader unit (36) is hydraulically connected to the pump (12) on the output side between the pump (12) and the storage unit (30) and acts as a separable hydraulic connection between the pump (12) and the storage unit (30).

Description

Die Erfindung betrifft eine hydraulische Anordnung mit einer Pumpe zum Fördern eines Hydraulikmediums in Richtung einer hydraulischen Arbeitslast.The invention relates to a hydraulic arrangement with a pump for conveying a hydraulic medium in the direction of a hydraulic workload.

Die Pumpe einer derartigen hydraulischen Anordnung fördert das Hydraulikmedium in der Regel mit diskretem Verdrängungsvolumen. Dies kann zu Volumenstrom- und damit auch zu Druckpulsationen führen, welche durch eine an die Pumpe angeschlossene Speichereinheit effektiv reduziert oder vermieden werden. Die Speichereinheit kann allerdings das hydraulische Verhalten der Anordnung beeinflussen.The pump of such a hydraulic arrangement usually delivers the hydraulic medium with discrete displacement volume. This can lead to volume flow and thus also to pressure pulsations, which are effectively reduced or avoided by a storage unit connected to the pump. However, the storage unit may affect the hydraulic behavior of the assembly.

Es ist daher Aufgabe der vorliegenden Erfindung, das hydraulische Verhalten der hydraulischen Anordnung zu verbessern.It is therefore an object of the present invention to improve the hydraulic behavior of the hydraulic arrangement.

Diese Aufgabe wird durch eine hydraulische Anordnung mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a hydraulic arrangement having the features of patent claim 1.

Weitere vorteilhafte Ausgestaltungen der erfindungsgemäßen hydraulischen Anordnung gehen aus den Unteransprüchen hervor.Further advantageous embodiments of the hydraulic arrangement according to the invention will become apparent from the dependent claims.

Gemäß Patentanspruch 1 enthält die hydraulische Anordnung eine Pumpe zum Fördern eines Hydraulikmediums (z.B. Öl) in Richtung einer hydraulischen Arbeitslast, welche als hydraulischer Verbraucher wirkt. Die Pumpe ist mittels eines Verstelleingangs verstellbar, so dass sie immer einen angepassten Förderstrom bzw. eine angepasste Fördermenge breitstellen kann. Hierdurch kann die Pumpe bezüglich des Hydraulikmediums von einer Vollförderung bis zu einer Nullförderung arbeiten. Weiterhin enthält die hydraulische Anordnung eine Speichereinheit (z.B. Membranspeicher), welche an die Pumpe ausgangsseitig hydraulisch angeschlossen ist. Diese Speichereinheit reduziert etwaige Druckpulsationen und damit einhergehende Belastungen von Bauteilen als auch störende Geräusche der hydraulischen Anordnung. Außerdem weist die hydraulische Anordnung eine Ladeventileinheit zum Laden und Entladen der Speichereinheit auf. Dabei ist die Ladeventileinheit an der Pumpe ausgangsseitig zwischen der Pumpe und der Speichereinheit hydraulisch angeschlossen und wirkt mit ihren unterschiedlichen Schaltzuständen als eine trennbare hydraulische Verbindung zwischen der Pumpe und der Speichereinheit. Hierbei ist es möglich, dass die Ladeventileinheit mittels eines in Richtung der Pumpe durchlässigen Rückschlagventils gebrückt ist, wobei das Rückschlagventil baulich in die Ladeventileinheit integriert sein kann. In Richtung der Speichereinheit ist das Rückschlagventil geschlossen.According to claim 1, the hydraulic arrangement includes a pump for conveying a hydraulic medium (eg oil) in the direction of a hydraulic workload, which acts as a hydraulic consumer. The pump is adjustable by means of an adjustment input, so that they can always provide an adapted flow rate or an adapted flow rate. As a result, the pump can work with respect to the hydraulic medium of a full funding up to a zero promotion. Furthermore, the hydraulic arrangement contains a storage unit (eg diaphragm accumulator), which is hydraulically connected to the pump on the output side. This storage unit reduces any pressure pulsations and associated burdens of Components as well as disturbing noises of the hydraulic arrangement. In addition, the hydraulic arrangement has a loading valve unit for loading and unloading the storage unit. In this case, the charging valve unit is hydraulically connected at the pump on the output side between the pump and the storage unit and acts with their different switching states as a separable hydraulic connection between the pump and the storage unit. In this case, it is possible that the charging valve unit is bridged by means of a non-return valve which is permeable in the direction of the pump, wherein the non-return valve can be structurally integrated into the charging valve unit. In the direction of the storage unit, the check valve is closed.

Eine derartige Ladeventileinheit schafft eine technisch einfache und kostengünstige Voraussetzung dafür, dass die hydraulische Anordnung bei unterschiedlichen Betriebsbereichen der Pumpe ein Ansprechverhalten zeigt, welches im Wesentlichen unabhängig von Änderungen des Förderstromes ist. Etwaige akustische und/oder mechanische Schwingungen in der hydraulischen Anordnung bzw. im Hydrauliksystem werden reduziert oder vollständig vermieden, da ein kontinuierliches Befüllen und Entleeren der Speichereinheit durch die Ladeventileinheit aktiv gedämpft werden kann.Such a charging valve unit provides a technically simple and inexpensive condition for the hydraulic arrangement to exhibit a response at different operating ranges of the pump which is substantially independent of changes in the delivery flow. Any acoustic and / or mechanical vibrations in the hydraulic arrangement or in the hydraulic system are reduced or completely avoided, since a continuous filling and emptying of the storage unit can be actively damped by the charging valve unit.

In einer bevorzugten Ausführungsform kommt die hydraulische Anordnung bei einer mobilen Hydraulik zum Einsatz, wie z.B. bei landwirtschaftlichen Arbeitsmaschinen, Baumaschinen oder Straßenbau-Fahrzeugen. Die hydraulische Arbeitslast ist dementsprechend vorzugsweise bei einer der vorgenannten mobilen Maschinen bzw. einem der vorgenannten Fahrzeuge enthalten. Die hydraulische Arbeitslast kann beispielsweise als Lenk- oder Bremsaggregat, Hydromotor, Kraftheber-Zylinder ausgebildet sein oder bei einem Anbaugerät für eine der vorgenannten Maschinen bzw. Fahrzeuge eingesetzt sein.In a preferred embodiment, the hydraulic arrangement is used in mobile hydraulics, such as in agricultural machines, construction machines or road construction vehicles. Accordingly, the hydraulic workload is preferably contained in one of the aforementioned mobile machines or one of the aforementioned vehicles. The hydraulic workload can be designed, for example, as a steering or braking unit, hydraulic motor, power lift cylinder be or be used in an attachment for one of the aforementioned machines or vehicles.

Für eine effiziente Funktionalität weist die Ladeventileinheit mindestens zwei, insbesondere genau zwei unterschiedliche Schaltstellungen auf. Dabei ist die Ladeventileinheit bei einem maximalen Förderstrom (Vollförderung) der Pumpe geschlossen, während sie bei einem geringeren Förderstrom, d.h. unterhalb des maximalen Förderstromes, geöffnet ist. Hierdurch besteht zwischen der Pumpe und der Speichereinheit bei einem Förderstrom unterhalb des maximalen Förderstromes eine hydraulische Verbindung. Die Speichereinheit erfüllt dann die gewünschte Funktion zur Reduzierung von Druckpulsationen bzw. zur Pulsationsdämpfung.For efficient functionality, the loading valve unit has at least two, in particular exactly two different switching positions. In this case, the loading valve unit is closed at a maximum delivery flow (full delivery) of the pump, while at a lower flow rate, i. below the maximum flow, is opened. As a result, there is a hydraulic connection between the pump and the storage unit at a delivery flow below the maximum delivery flow. The memory unit then fulfills the desired function for reducing pressure pulsations or for pulsation damping.

Im Falle einer spezifischen Förderstrom- oder Druckanforderung des Hydrauliksystems wird die Pumpe insbesondere auf eine Vollförderung verstellt. Die Ladeventileinheit trennt dann die Speichereinheit vom Hydrauliksystem und vermeidet hierdurch, dass die Speichereinheit gefüllt wird. Dies führt bei Änderungen des Förderstromes vorteilhaft zu einem Ansprechverhalten des Hydrauliksystems ohne eine Speichereinheit, so dass ansonsten durch eine Speichereinheit bedingte Nachteile wie reduzierte Steifigkeit oder Schwingungsanregungen im Hydrauliksystem vermieden werden. In bestimmten Betriebszuständen kann die Speichereinheit zudem einen Druckeinbruch aufgrund abrupter Volumenstrom- oder Druckanforderungen reduzieren, insbesondere dann, wenn die Ladeventileinheit mittels eines in Richtung der Pumpe durchlässigen Rückschlagventils gebrückt ist.In the case of a specific delivery flow or pressure requirement of the hydraulic system, the pump is adjusted in particular to full delivery. The loader unit then disconnects the storage unit from the hydraulic system, thereby preventing the storage unit from being filled. This leads to changes in the flow advantageous to a response of the hydraulic system without a memory unit, so that otherwise caused by a memory unit disadvantages such as reduced stiffness or vibration excitations in the hydraulic system can be avoided. In certain operating conditions, the storage unit may also reduce pressure drop due to abrupt volumetric flow or pressure requirements, especially when the loader unit is bridged by means of a non-return valve that is permeable to the pump.

Vorzugsweise ist die Ladeventileinheit technisch einfach ausgebildet, indem sie bei einem drucklosen Zustand eines hydraulischen Steuereingangs geschlossen ist und bei einem mit Hydraulikdruck beaufschlagten Druckzustand des Steuereingangs geöffnet ist. Die Ladeventileinheit kann dann mittels eines sogenannten Pilotdruckes am Steuereingang geöffnet werden. Vorzugsweise weist die Ladeventileinheit eine übliche Federseite (z.B. Rückstellfeder) auf, während der vorgenannte Steuereingang relativ zu der Federseite an einer gegenüberliegenden Gegenseite der Ladeventileinheit angeordnet ist.Preferably, the charging valve unit is technically simple in that it is closed in a pressureless state of a hydraulic control input and is open at a pressurized state of the control input with hydraulic pressure. The charging unit can then be opened by means of a so-called pilot pressure at the control input. Preferably, the loader unit has a conventional spring side (e.g., return spring) while the aforesaid control input is located relative to the spring side on an opposite opposite side of the loader unit.

In einer bevorzugten Ausführungsform ist die Ladeventileinheit als ein diskretes oder proportionales 2/2-Wegeventil mit zwei Anschlüssen und zwei Schaltstellungen ausgebildet und kann hierdurch kostengünstig als Standardbauteil bereitgestellt werden. Abweichend kann das Wegeventil auch eine darüber hinausgehende Anzahl an Schaltstellungen aufweisen.In a preferred embodiment, the charging valve unit is formed as a discrete or proportional 2/2-way valve with two ports and two switching positions and can thereby be provided inexpensively as a standard component. Notwithstanding, the directional control valve can also have an exceeding number of switching positions.

Um die Pumpe bezüglich des Förderstromes kontrolliert verstellen zu können, ist deren Verstelleingang vorzugsweise an einen Reglerausgang einer hydraulischen Regeleinheit hydraulisch angeschlossen.In order to be able to adjust the pump with respect to the delivery flow, its adjustment input is preferably connected hydraulically to a regulator output of a hydraulic control unit.

In einer weiteren bevorzugten Ausführungsform ist der Steuereingang der Ladeventileinheit an denselben Reglerausgang hydraulisch angeschlossen, mit dem der Verstelleingang der Pumpe hydraulisch verbunden ist. Hierdurch kann eine definierte Ansteuerung (Schließen und Öffnen) der Ladeventileinheit in Abhängigkeit des Förderstromes bei gleichzeitig einfacher hydraulischer Struktur der hydraulischen Anordnung bzw. des Hydrauliksystems realisiert werden.In a further preferred embodiment, the control input of the charging valve unit is hydraulically connected to the same controller output to which the adjustment input of the pump is hydraulically connected. In this way, a defined activation (closing and opening) of the charging valve unit can be realized as a function of the delivery flow with a simultaneously simple hydraulic structure of the hydraulic arrangement or of the hydraulic system.

Insbesondere enthält die Regeleinheit einen hydraulischen Volumenstrom-Regler und/oder einen hydraulischen Druck-Regler. Mittels dieser Regler kann das Hydrauliksystem einen hydraulischen Volumenstrom oder Druck anfordern. Diese Anforderung wird in der Pumpe durch eine Verstellung des Förderstromes, insbesondere durch Vollförderung, umgesetzt. Der Volumenstrom-Regler und/oder der Druck-Regler ist vorzugsweise als ein Wegeventil, beispielsweise ein 3/2-Wegeventil, ausgebildet.In particular, the control unit includes a hydraulic volume flow controller and / or a hydraulic pressure regulator. By means of these regulators, the hydraulic system can request a hydraulic volume flow or pressure. This requirement is implemented in the pump by adjusting the flow rate, in particular by full promotion. The volume flow regulator and / or the pressure regulator is preferably designed as a directional control valve, for example a 3/2-way valve.

Um die Pumpe definiert und technisch einfach verstellen zu können, weist deren Verstelleingang vorzugsweise ein mittels Hydraulikdruck beaufschlagbares Rückstellelement (z.B. Rückstellkolben) auf. Dieser wird bei einer Begrenzung des Förderstromes unterhalb der Vollförderung mit einem Verstell-Druck beaufschlagt. Dieser Verstell-Druck kann durch die Regeleinheit derart geregelt werden, dass die Pumpe den angepassten Förderstrom bereitstellt. Bei einer Volumenstrom- oder Druckanforderung des Hydrauliksystems kann die Pumpe durch Ablassen des Verstell-Druckes in Richtung Vollförderung oder durch Erhöhung des Verstell-Druckes in Richtung Nullförderung verstellt werden.In order to be able to define the pump in a technically simple manner, its adjusting input preferably has a restoring element (for example return piston) which can be acted upon by hydraulic pressure. This is subjected to a limitation of the flow below the full promotion with an adjustment pressure. This adjustment pressure can be controlled by the control unit such that the pump provides the adjusted flow rate. In the case of a volume flow or pressure requirement of the hydraulic system, the pump can be adjusted by lowering the adjustment pressure in the direction of full delivery or by increasing the adjustment pressure in the direction of zero delivery.

Die erfindungsgemäße hydraulische Anordnung wird im Folgenden anhand der beigefügten Zeichnung näher erläutert. Dabei sind hinsichtlich ihrer Funktion übereinstimmende bzw. vergleichbare Bauteile mit denselben Bezugszeichen gekennzeichnet. Die einzige Figur zeigt einen hydraulischen Schaltplan mit der hydraulischen Anordnung.The inventive hydraulic arrangement will be explained in more detail below with reference to the accompanying drawings. With regard to their function, matching or comparable components are identified by the same reference numerals. The sole figure shows a hydraulic circuit diagram with the hydraulic arrangement.

Fig. 1 zeigt eine hydraulische Anordnung 10 bzw. Hydrauliksystem mit einer Pumpe 12 zum Fördern eines Hydraulikmediums (z.B. Öl) in Richtung einer hydraulischen Arbeitslast 14. Hierbei ist die Pumpe 12 mit einer Saugleitung 16 an einen das Hydraulikmedium enthaltenden Hydraulikbehälter 18 bzw. Sumpf angeschlossen. Fig. 1 shows a hydraulic assembly 10 or hydraulic system with a pump 12 for conveying a hydraulic medium (eg oil) in the direction of a hydraulic workload 14. Here, the pump 12 is connected to a suction line 16 to a Hydraulic medium containing hydraulic tank 18 and sump connected.

Die Pumpe 12 weist einen Verstelleingang auf, um einen hydraulischen Förderstrom zu verstellen. Zu diesem Zweck weist der Verstelleingang 20 ein Rückstellelement 22 in Form eines hier nicht im Detail dargestellten Rückstellkolbens auf. Dieses Rückstellelement 22 wird bei einem Förderstrom unterhalb einer Vollförderung mit einem Verstell-Druck p_V beaufschlagt. Dabei wird der Verstell-Druck p_V durch einen hydraulischen Volumenstrom-Regler 24 und einen hydraulischen Druck-Regler 26 innerhalb einer Regeleinheit 28 derart geregelt, dass die Pumpe 12 einen entsprechend dimensionierten Förderstrom bereitstellt. Bei einer Volumenstrom- oder Druckanforderung des Hydrauliksystems wird die Pumpe 12 durch Ablassen des Verstell-Druckes in Richtung Vollförderung oder durch Erhöhung des Verstell-Druckes in Richtung Nullförderung verstellt.The pump 12 has an adjustment input to adjust a hydraulic flow. For this purpose, the adjustment 20 has a return element 22 in the form of a return piston not shown in detail here. This return element 22 is acted upon at a delivery flow below a full delivery with an adjustment pressure p_V. In this case, the adjustment pressure p_V is controlled by a hydraulic volume flow controller 24 and a hydraulic pressure regulator 26 within a control unit 28 such that the pump 12 provides a correspondingly sized flow rate. In a volume flow or pressure requirement of the hydraulic system, the pump 12 is adjusted by lowering the adjustment pressure towards full delivery or by increasing the adjustment pressure in the direction of zero promotion.

Um Förderstrom- und Druckpulsationen im Hydrauliksystem zu reduzieren oder zu vermeiden, ist an die Pumpe 12 ausgangsseitig eine Speichereinheit 30 hydraulisch angeschlossen. Zwischen einem Pumpenausgang 32 der Pumpe 12 und einem Speicheranschluss 34 der Speichereinheit 30 ist eine Ladeventileinheit 36 hydraulisch angeschlossen. Die Ladeventileinheit 36 ist als ein 2/2-Wegeventil mit zwei Anschlüssen und zwei Schaltstellungen ausgebildet. Mittels der Ladeventileinheit 36 ist eine trennbare hydraulische Verbindung zwischen der Pumpe 12 und der Speichereinheit 30 hergestellt. Gemäß einer nicht dargestellten Weiterbildung ist die Ladeventileinheit 36 mittels eines in Richtung der Pumpe 12 durchlässigen Rückschlagventils gebrückt, wobei das Rückschlagventil baulich in die Ladeventileinheit 36 integriert ist.In order to reduce or avoid flow and pressure pulsations in the hydraulic system, a storage unit 30 is hydraulically connected to the pump 12 on the output side. Between a pump outlet 32 of the pump 12 and a storage port 34 of the storage unit 30, a charging valve unit 36 is hydraulically connected. The charging valve unit 36 is formed as a 2/2-way valve with two ports and two switching positions. By means of the loading valve unit 36, a separable hydraulic connection between the pump 12 and the storage unit 30 is made. According to a further embodiment, not shown, the charging valve unit 36 is bridged by means of a permeable in the direction of the pump 12 check valve, the check valve is structurally integrated into the charging valve unit 36.

Die Ladeventileinheit 36 ist im drucklosen Zustand eines hydraulischen Steuereingangs 38 geschlossen und wird bei einem mit Hydraulikdruck (Pilotdruck) p beaufschlagten Druckzustand des Steuereingangs 38 geöffnet. Dabei sind der Steuereingang 38 und der Verstelleingang 22 mit einem Reglerausgang 40 der Regeleinheit 28 hydraulisch verbunden. Hierdurch entsteht bei einfachem Aufbau und entsprechender Dimensionierung der Ladeventileinheit 36 ein vorteilhaftes Ansprechverhalten der hydraulischen Anordnung 10 bzw. des Hydrauliksystems. Im akustisch und schwingungstechnisch kritischen Betriebsbereich der Pumpe 12 ist diese auf einen Förderstrom unterhalb der Vollförderung eingestellt. Das Rückstellelement 22 wird dabei immer mit einem spezifischen Verstell-Druck p_V beaufschlagt und begrenzt somit den Förderstrom. Folglich wird auch der Steuereingang 38 mit einem spezifischen Druck p beaufschlagt und die Ladeventileinheit 36 ist dementsprechend geöffnet. Somit erfüllt die Speichereinheit 30 die gewünschte Funktion einer Pulsationsdämpfung.The charging valve unit 36 is closed in the pressureless state of a hydraulic control input 38 and is opened at a pressure state of the control input 38 applied with hydraulic pressure (pilot pressure) p. In this case, the control input 38 and the adjustment input 22 are hydraulically connected to a regulator output 40 of the control unit 28. This results in a simple structure and appropriate dimensioning of the charging valve unit 36, an advantageous response of the hydraulic assembly 10 and the hydraulic system. In the acoustic and vibration technology critical operating range of the pump 12, this is set to a flow below the full promotion. The return element 22 is always acted upon by a specific adjustment pressure p_V and thus limits the flow rate. Consequently, the control input 38 is acted upon by a specific pressure p and the charging valve unit 36 is opened accordingly. Thus, the memory unit 30 fulfills the desired function of pulsation damping.

Bei einer spezifischen Volumenstrom- oder Druckanforderung des Hydrauliksystems wird die Pumpe 12 durch Ablassen des Verstell-Druckes p_V am Steuereingang 20 auf eine Vollförderung (maximaler Förderstrom) verstellt. In diesem Fall befindet sich der Steuereingang 38 in einem drucklosen Zustand und die Ladeventileinheit 36 ist dementsprechend geschlossen. Folglich trennt die Ladeventileinheit 36 die Speichereinheit 30 vom Hydrauliksystem und vermeidet hierdurch, dass die Speichereinheit 30 gefüllt wird. Dies führt zu einem Ansprechverhalten der hydraulischen Anordnung bzw. des Hydrauliksystems, welches mit einem Hydrauliksystem ohne derartige Speichereinheit 30 vergleichbar ist. Eine negative Rückwirkung der Speichereinheit 30 auf das Hydrauliksystem lässt sich so ausschließen.At a specific volume flow or pressure requirement of the hydraulic system, the pump 12 is adjusted by discharging the adjustment pressure p_V at the control input 20 to a full delivery (maximum flow). In this case, the control input 38 is in a depressurized state and the charging valve unit 36 is accordingly closed. As a result, the loading valve unit 36 separates the storage unit 30 from the hydraulic system, thereby preventing the storage unit 30 from being filled. This leads to a response of the hydraulic arrangement or the hydraulic system, which is comparable to a hydraulic system without such a memory unit 30. A negative reaction of the storage unit 30 to the hydraulic system can thus be excluded.

In dem Ausführungsbeispiel enthält die hydraulische Anordnung 10 noch einzelne Dämpfungsblenden 42 und 44, welche hydraulisch hintereinander zwischen dem Regerausgang 40 und dem Hydraulikbehälter 18 angeordnet sind.In the exemplary embodiment, the hydraulic arrangement 10 also contains individual damping orifices 42 and 44, which are arranged hydraulically one behind the other between the control output 40 and the hydraulic reservoir 18.

Der Volumenstrom-Regler 24 und der Druck-Regler 26 sind jeweils als ein 3/2- Wegeventil ausgebildet.The volume flow controller 24 and the pressure regulator 26 are each formed as a 3/2-way valve.

Zwischen dem Pumpenausgang 32 und der Arbeitslast 14 ist eine sogenannte Messblende 46 hydraulisch angeschlossen, an der die Regeldruckdifferenz des Volumenstrom-Reglers 24 abfällt. Durch eine Verstellung der Messblende 46 kann der Volumenstrom variiert werden. Der Volumenstrom ist damit unabhängig von der Arbeitslast 14. Die Messblende 46 stellt insoweit ein vereinfachtes Steuergerät dar. An den Pumpenausgang 32 können in weiteren Ausführungsformen mehrere derartige Steuergeräte mit entsprechenden Arbeitslasten bzw. Verbrauchern parallel angeschlossen sein. In diesem Fall kann die Messblende 46 bzw. das durch diese gebildete Steuergerät mit einer Druckwaage ergänzt werden, um den Volumenstrom durch Anpassung der an der Messblende 46 anliegenden Regeldruckdifferenz konstant zu halten.Between the pump outlet 32 and the workload 14, a so-called orifice plate 46 is hydraulically connected, at which the control pressure difference of the volume flow controller 24 drops. By adjusting the metering orifice 46, the volume flow can be varied. The flow rate is thus independent of the workload 14. The metering orifice 46 is so far a simplified control unit. At the pump outlet 32, in a further embodiment, several such control units can be connected in parallel with corresponding workloads or consumers. In this case, the metering orifice 46 or the control unit formed by these can be supplemented with a pressure compensator in order to keep the volume flow constant by adapting the control pressure difference applied to the metering orifice 46.

Claims (9)

Hydraulische Anordnung - mit einer Pumpe (12) zum Fördern eines Hydraulikmediums in Richtung einer hydraulischen Arbeitslast (14), wobei die Pumpe (12) einen Verstelleingang (20) zur Verstellung eines Förderstromes der Pumpe (12) aufweist, - mit einer an die Pumpe (12) ausgangsseitig hydraulisch angeschlossenen Speichereinheit (30), und - mit einer Ladeventileinheit (36), welche an der Pumpe (12) ausgangsseitig zwischen der Pumpe (12) und der Speichereinheit (30) hydraulisch angeschlossen ist und als trennbare hydraulische Verbindung zwischen der Pumpe (12) und der Speichereinheit (30) wirkt. Hydraulic arrangement - With a pump (12) for conveying a hydraulic medium in the direction of a hydraulic work load (14), wherein the pump (12) has an adjustment input (20) for adjusting a flow rate of the pump (12), - With a to the pump (12) output side hydraulically connected storage unit (30), and - With a loading valve unit (36) which is hydraulically connected to the pump (12) on the output side between the pump (12) and the storage unit (30) and acts as a separable hydraulic connection between the pump (12) and the storage unit (30). Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Ladeventileinheit (36) mittels eines in Richtung der Pumpe (12) durchlässigen Rückschlagventils gebrückt ist.Arrangement according to claim 1, characterized in that the loading valve unit (36) is bridged by means of a direction of the pump (12) permeable non-return valve. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass
die Ladeventileinheit (36) mindestens zwei unterschiedliche Schaltstellungen aufweist derart, dass - die Ladeventileinheit (36) geschlossen ist bei einem maximalen Förderstrom der Pumpe (12), und - die Ladeventileinheit (36) geöffnet ist bei einem Förderstrom unterhalb des maximalen Förderstromes. Arrangement according to claim 1 or 2, characterized in that
the loading valve unit (36) has at least two different switching positions such that - The loading valve unit (36) is closed at a maximum flow rate of the pump (12), and - The loading valve unit (36) is open at a flow rate below the maximum flow rate. Anordnung nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Ladeventileinheit (36) - geöffnet ist bei einem mit Hydraulikdruck (p) beaufschlagten Druckzustand eines hydraulischen Steuereingangs (38), und - geschlossen ist bei einem drucklosen Zustand des Steuereingangs (38). Arrangement according to at least one of the preceding claims, characterized in that the loading valve unit (36) - Is open at a hydraulic pressure (p) acted upon pressure state of a hydraulic control input (38), and - Is closed at a pressure-free state of the control input (38). Anordnung nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Ladeventileinheit (36) als ein 2/2-Wegeventil ausgebildet ist.Arrangement according to at least one of the preceding claims, characterized in that the charging valve unit (36) is designed as a 2/2-way valve. Anordnung nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine hydraulische Regeleinheit (28) aufweist, welche mit einem Reglerausgang (40) an den Verstelleingang (20) der Pumpe (12) hydraulisch angeschlossen ist.Arrangement according to at least one of the preceding claims, characterized in that it comprises a hydraulic control unit (28) which is hydraulically connected to a control output (40) to the adjustment input (20) of the pump (12). Anordnung nach Anspruch 6, dadurch gekennzeichnet, dass der Steuereingang (38) der Ladeventileinheit (36) an den Reglerausgang (40) der Regeleinheit (28) hydraulisch angeschlossen ist.Arrangement according to claim 6, characterized in that the control input (38) of the charging valve unit (36) to the controller output (40) of the control unit (28) is hydraulically connected. Anordnung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Regeleinheit (28) einen hydraulischen Volumenstrom-Regler (24) und/oder einen hydraulischen Druck-Regler (26) aufweist.Arrangement according to claim 6 or 7, characterized in that the control unit (28) has a hydraulic volume flow regulator (24) and / or a hydraulic pressure regulator (26). Anordnung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Verstelleingang (20) der Pumpe (12) ein mittels Hydraulikdruck (p_V) beaufschlagbares Rückstellelement (22) aufweist.Arrangement according to one of the preceding claims,
characterized in that the adjustment input (20) of the pump (12) by means of a hydraulic pressure (p_V) acted upon return element (22).
EP18197332.2A 2017-10-02 2018-09-27 Hydraulic arrangement Active EP3462028B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017217552.4A DE102017217552A1 (en) 2017-10-02 2017-10-02 Hydraulic arrangement

Publications (2)

Publication Number Publication Date
EP3462028A1 true EP3462028A1 (en) 2019-04-03
EP3462028B1 EP3462028B1 (en) 2021-09-15

Family

ID=63708149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18197332.2A Active EP3462028B1 (en) 2017-10-02 2018-09-27 Hydraulic arrangement

Country Status (3)

Country Link
US (1) US10731670B2 (en)
EP (1) EP3462028B1 (en)
DE (1) DE102017217552A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007014676U1 (en) * 2007-10-19 2009-02-26 Liebherr-Machines Bulle S.A. Hydraulic drive system
WO2011038706A1 (en) * 2009-09-29 2011-04-07 Schaeffler Technologies Gmbh & Co. Kg Hydraulic control system
DE102010053258A1 (en) * 2009-12-14 2011-06-16 Schaeffler Technologies Gmbh & Co. Kg hydraulic arrangement
DE102010014071A1 (en) * 2010-04-07 2011-10-13 Hydac Filtertechnik Gmbh Hydraulic system
EP2420626A1 (en) * 2010-08-19 2012-02-22 Deere & Company Hydraulic assembly
DE102013211986A1 (en) * 2013-06-25 2015-01-08 Robert Bosch Gmbh Method for determining a fill level
DE102014107240A1 (en) * 2014-05-22 2015-11-26 Linde Hydraulics Gmbh & Co. Kg Hybrid hydrostatic drive for a hybrid powertrain
DE102015206403A1 (en) * 2015-04-10 2016-10-13 Robert Bosch Gmbh Hydraulic arrangement and method for leakage measurement for a hydraulic arrangement

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5138135B2 (en) * 1971-09-17 1976-10-20
US4523430A (en) * 1981-03-19 1985-06-18 Daikin Kogyo Co., Ltd. Fluid flow control system
JP2964607B2 (en) * 1990-10-11 1999-10-18 日産自動車株式会社 Hydraulic supply device
US6973781B2 (en) * 2003-10-29 2005-12-13 Zf Friedrichshafen Ag Method and apparatus for maintaining hydraulic pressure when a vehicle is stopped
DE102006046127A1 (en) * 2006-09-28 2008-04-03 Robert Bosch Gmbh Energy storage unit
DE102006050873A1 (en) * 2006-10-27 2008-04-30 Robert Bosch Gmbh Hydrostatic drive i.e. traction drive, for e.g. wheel loader, has hydraulic pump and hydraulic motor arranged in open circuit, where downstream connection of hydraulic motor is connected with tank volume or storage unit by valve device
DE102014215567A1 (en) * 2014-08-06 2016-02-11 Robert Bosch Gmbh Hydrostatic drive

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007014676U1 (en) * 2007-10-19 2009-02-26 Liebherr-Machines Bulle S.A. Hydraulic drive system
WO2011038706A1 (en) * 2009-09-29 2011-04-07 Schaeffler Technologies Gmbh & Co. Kg Hydraulic control system
DE102010053258A1 (en) * 2009-12-14 2011-06-16 Schaeffler Technologies Gmbh & Co. Kg hydraulic arrangement
DE102010014071A1 (en) * 2010-04-07 2011-10-13 Hydac Filtertechnik Gmbh Hydraulic system
EP2420626A1 (en) * 2010-08-19 2012-02-22 Deere & Company Hydraulic assembly
DE102013211986A1 (en) * 2013-06-25 2015-01-08 Robert Bosch Gmbh Method for determining a fill level
DE102014107240A1 (en) * 2014-05-22 2015-11-26 Linde Hydraulics Gmbh & Co. Kg Hybrid hydrostatic drive for a hybrid powertrain
DE102015206403A1 (en) * 2015-04-10 2016-10-13 Robert Bosch Gmbh Hydraulic arrangement and method for leakage measurement for a hydraulic arrangement

Also Published As

Publication number Publication date
US10731670B2 (en) 2020-08-04
DE102017217552A1 (en) 2019-04-04
EP3462028B1 (en) 2021-09-15
US20190101136A1 (en) 2019-04-04

Similar Documents

Publication Publication Date Title
DE102004012382B4 (en) Hydraulic arrangement
EP3567167A2 (en) Hydraulic control system for an assembly of mobile working machines and assembly of mobile working machines
DE10303360A1 (en) Hydraulic system for displacement-controlled linear drives
DE10307346A1 (en) valve assembly
EP3491253A1 (en) Electro-hydrostatic drive system
EP0016719B1 (en) Hydraulic motor control device
EP1778508A1 (en) Suspension system
EP1989450B1 (en) Hydraulic control arrangement
DE102012207422A1 (en) Hydraulic control system used for working machine e.g. mini excavators, has pressure reduction device for high load pressure, which is more adjusted in dependence of controlled volumetric flow of adjuster of the hydraulic pump
DE102012019863B4 (en) vehicle
EP2420626A1 (en) Hydraulic assembly
DE102014016639A1 (en) Hydraulic valve arrangement with control function
DE10219717B3 (en) Hydraulic valve arrangement
EP2927371B1 (en) Circuit
DE19720454B4 (en) Hydrostatic drive system
DE102014016642A1 (en) Hydraulic valve arrangement with control function
DE102014226182A1 (en) Control valve assembly and hydraulic drive system with it
DE102007051525B4 (en) Hydraulic supply system with a variable displacement pump device
EP1769951A1 (en) Arrangement and cab suspension
EP3462028B1 (en) Hydraulic arrangement
DE102017107994B4 (en) Motor vehicle chassis
EP2157320B1 (en) Hydraulic device for a hydro motor
DE102017109421A1 (en) Hydraulic system of a agricultural or construction industry usable machine
DE102016117208A1 (en) Load-sensing drive system
EP0746690B1 (en) Hydraulic pump control system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20191004

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20210419

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502018007062

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1430705

Country of ref document: AT

Kind code of ref document: T

Effective date: 20211015

REG Reference to a national code

Ref country code: FI

Ref legal event code: FGE

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20210915

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211215

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211215

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211216

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20210930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220115

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220117

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502018007062

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210927

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210927

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210930

26N No opposition filed

Effective date: 20220616

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210930

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20180927

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20230921

Year of fee payment: 6

Ref country code: GB

Payment date: 20230927

Year of fee payment: 6

Ref country code: FI

Payment date: 20230925

Year of fee payment: 6

Ref country code: AT

Payment date: 20230901

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20230925

Year of fee payment: 6

Ref country code: DE

Payment date: 20230821

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210915