EP3931450B1 - Hydraulic drive system - Google Patents

Hydraulic drive system Download PDF

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Publication number
EP3931450B1
EP3931450B1 EP20726736.0A EP20726736A EP3931450B1 EP 3931450 B1 EP3931450 B1 EP 3931450B1 EP 20726736 A EP20726736 A EP 20726736A EP 3931450 B1 EP3931450 B1 EP 3931450B1
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EP
European Patent Office
Prior art keywords
hydraulic
feed line
individual units
drive system
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20726736.0A
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German (de)
French (fr)
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EP3931450A1 (en
EP3931450C0 (en
Inventor
Andreas Böhler
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Hydac Fluidtechnik GmbH
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Hydac Fluidtechnik GmbH
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Publication of EP3931450A1 publication Critical patent/EP3931450A1/en
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Publication of EP3931450B1 publication Critical patent/EP3931450B1/en
Publication of EP3931450C0 publication Critical patent/EP3931450C0/en
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    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0807—Manifolds
    • F15B13/0817—Multiblock manifolds
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0878—Assembly of modular units
    • F15B13/0882—Assembly of modular units using identical modular elements
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0878—Assembly of modular units
    • F15B13/0885—Assembly of modular units using valves combined with other components
    • F15B13/0892—Valves combined with fluid 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/003—Systems with different interchangeable components, e.g. using preassembled kits
    • 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
    • F15B1/26—Supply reservoir or sump assemblies
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/022—Systems essentially incorporating special features for controlling the speed or actuating force of an output member in which a rapid approach stroke is followed by a slower, high-force working stroke
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0832—Modular valves
    • F15B13/0839—Stacked plate type valves
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
    • F15B2013/006—Modular components with multiple uses, e.g. kits for either normally-open or normally-closed valves, interchangeable or reprogrammable manifolds
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/265—Control of multiple pressure sources
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/265—Control of multiple pressure sources
    • F15B2211/2658—Control of multiple pressure sources by control of the prime movers
    • 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
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/3051—Cross-check valves
    • 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
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple output members
    • 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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
    • F15B2211/31535—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having multiple pressure sources and a single output member
    • 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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31582—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and a single output member
    • 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
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • 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
    • F15B2211/615—Filtering means
    • 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
    • F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

Die Erfindung betrifft ein hydraulisches Antriebssystem.The invention relates to a hydraulic drive system.

Hydraulische Antriebssysteme kommen bei mit Hydrauliksystemen versehenen technischen Anlagen zum Einsatz, bei denen eine hydraulische Betätigung von Aktoren für Steuer- und/oder Arbeitsfunktionen vorgesehen ist. Aus der Vielzahl der Anwendungsgebiete seien beispielsweise der Einsatz bei mobilen Anlagen, wie Kränen oder Staplern, oder auch der Einsatz bei Kraftfahrzeughebebühnen genannt. Beispielhaft zeigt die DE 10 2014 009 996 A1 ein Ventilsystem, bei dem in der Art eines Baukastens für die Versorgung von Verbrauchern, wie hydraulischen Aktoren, modulartige Blöcke fluidführend miteinander verbunden sind, die hydraulische Komponenten, wie Ventile, Druckwaagen, Blendeneinsätze und vergleichbare andere Fluid beeinflussende Ventilkomponenten enthalten.Hydraulic drive systems are used in technical installations provided with hydraulic systems, in which hydraulic actuation of actuators for control and/or work functions is provided. From the large number of areas of application, for example, use in mobile systems such as cranes or forklifts, or use in motor vehicle lifting platforms should be mentioned. The DE 10 2014 009 996 A1 a valve system in which, in the manner of a kit for the supply of consumers, such as hydraulic actuators, modular blocks are connected to one another in a fluid-carrying manner, which contain hydraulic components such as valves, pressure compensators, orifice inserts and comparable other valve components affecting fluid.

Durch WO 2013/059033 A1 ist ein hydraulisches Antriebssystem bekannt mit mehreren hydraulischen Verbrauchern in Form von hydraulischen Arbeitszylindern und Hydromotoren. Jedem hydraulischen Verbraucher zugeordnet ist eine Ventileinrichtung vorgesehen, die als 4/3-Wegeproportional-ventil ausgebildet ist und den hydraulischen Zu- sowie Ablauf zu dem jeweiligen hydraulischen Verbraucher regelt. Eingangsseitig ist die jeweilige Ventileinrichtung mit einem geschlossen ausgebildeten, hydraulischen Versorgungskreislauf fluidführend verbunden, der als Bestandteil eine gemeinsame Einspeiseleitung aufweist, in die weitere Ventile mit Sperrfunktion geschaltet sind, wobei einzelne Hydropumpen aus der geschlossenen Kreislaufführung Arbeitsfluid entnehmen und in die gemeinsame Einspeiseleitung zur Versorgung des jeweils angeschlossenen Verbrauchers über die insoweit nachgeschaltete Ventileinrichtung einspeisen. Durch die in die Einspeiseleitung eingesetzten Ventile respektive Sperrventile, lassen sich die einzelnen der Versorgung dienenden Hydropumpen voneinander entkoppein, so dass sich dergestalt einzelne Verbraucher vom geschlossenen Versorgungskreislauf trennen und damit stilllegen lassen. Das bekannte hydraulische Antriebssystem mit geschlossener Kreislaufführung im Rahmen der Fluidversorgung ist speziell für eine Versorgungsaufgabe konzipiert, so dass für jeden Anwendungsfall einer hydraulischen Versorgung der zugeordnete Versorgungskreislauf mit den verschiedenen Hydropumpen und den Ventilen jeweils dezidiert anzupassen ist.Through WO 2013/059033 A1 is a hydraulic drive system known with several hydraulic consumers in the form of hydraulic working cylinders and hydraulic motors. Each hydraulic consumer is assigned a valve device which is designed as a 4/3-way proportional valve and regulates the hydraulic inlet and outlet to the respective hydraulic consumer. On the input side is the respective Valve device connected to a closed hydraulic supply circuit in a fluid-carrying manner, which has a common feed line as part of it, in which further valves with a blocking function are connected, with individual hydraulic pumps extracting working fluid from the closed circuit and feeding it into the common feed line to supply the respective connected consumer via the so far feed downstream valve device. The valves or check valves used in the feed line allow the individual hydraulic pumps used for supply to be decoupled from one another, so that individual consumers can be separated from the closed supply circuit and thus shut down. The well-known hydraulic drive system with a closed circuit as part of the fluid supply is specially designed for a supply task, so that the associated supply circuit with the various hydraulic pumps and valves must be specifically adapted for each application of a hydraulic supply.

Die EP 1 600 346 A1 beschreibt ein hydraulisches Antriebssystem bestehend aus mindestens zwei Einzelaggregaten, die jeweils eine mittels eines Antriebs betätigbare Hydropumpe aufweisen, die ausgangsseitig in eine gemeinsame Einspeiseleitung unter Druck stehendes Fluid einspeisen, an die, jedem Einzelaggregat zugeordnet, mindestens eine Ventileinrichtung angeschlossen ist, wobei mittels eines Ventiles in der Einspeiseleitung zwei benachbarte Einzelaggregate voneinander getrennt oder fluidführend miteinander verbunden sind, die modulartig ausgebildet in Aneinanderreihung eine Längsverkettung miteinander bilden und jeweils einen Abschnitt der Einspeiseleitung aufweisen, die an voneinander separierbaren Fluidanschlussstellen zwischen den benachbart angeordneten Einzelaggregaten miteinander verbunden, die Einspeiseleitung bilden.The EP 1 600 346 A1 describes a hydraulic drive system consisting of at least two individual units, each of which has a hydraulic pump that can be actuated by a drive, which feed pressurized fluid on the output side into a common feed line, to which at least one valve device is assigned, assigned to each individual unit, with a valve in the feed line, two adjacent individual units are separated from one another or connected to one another in a fluid-carrying manner, which are modularly designed in a row and form a longitudinal chain with one another and each have a section of the feed line which is connected to one another at fluid connection points that can be separated from one another between the adjacently arranged individual units, forming the feed line.

Ein weiteres hydraulisches Antriebssystem geht aus der WO 2017/005338 A1 hervor.Another hydraulic drive system comes from the WO 2017/005338 A1 out.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein hydraulisches Antriebssystem für hydraulische Verbraucher bereitzustellen, das sich an den jeweiligen Anwendungsfall in einfacher und kostengünstiger Weise anpassen lässt.Proceeding from this state of the art, the object of the invention is to provide a hydraulic drive system for hydraulic consumers that can be adapted to the respective application in a simple and cost-effective manner.

Eine dahingehende Aufgabe löst ein hydraulisches Antriebssystem mit den Merkmalen des Patentanspruches 1 in seiner Gesamtheit.A pertinent task is solved by a hydraulic drive system with the features of patent claim 1 in its entirety.

Demgemäß ist ein hydraulisches Antriebssystem vorgesehen, bestehend aus mindestens 2 Einzelaggregaten, die jeweils eine mittels eines Antriebs betätigbare Hydropumpe aufweisen, die ausgangsseitig in eine gemeinsame Einspeiseleitung unter Druck stehendes Fluid einspeisen, an die, jedem Einzelaggregat zugeordnet, mindestens eine Ventileinrichtung zur Versorgung eines jeweiligen Verbrauchers angeschlossen ist, wobei mittels eines Ventiles in der Einspeiseleitung zwei benachbarte Einzelaggregate voneinander getrennt oder fluidführend miteinander verbunden sind, wobei die mindestens zwei Einzelaggregate modulartig ausgebildet sind, in Aneinanderreihung eine Längsverkettung miteinander bilden und jeweils einen Abschnitt der Einspeiseleitung (18) aufweisen, wobei die jeweiligen Abschnitte der Einspeiseleitung (18) durch voneinander separierbare Fluidanschlussstellen (20) zwischen den benachbart angeordneten Einzelaggregaten (2) miteinander verbunden sind.Accordingly, a hydraulic drive system is provided, consisting of at least 2 individual units, each of which has a hydraulic pump that can be actuated by a drive, which feeds pressurized fluid on the output side into a common feed line, to which at least one valve device, assigned to each individual unit, is assigned for supplying a respective consumer is connected, with two adjacent individual units being separated from one another or connected to one another to carry fluid by means of a valve in the feed line, wherein the at least two individual units are of modular design, form a longitudinal chain with one another and each have a section of the feed line (18), the respective Sections of the feed line (18) are connected to one another by fluid connection points (20) which can be separated from one another between the adjacently arranged individual units (2).

Gemäß Anspruch 1 ist vorgesehen, dass die fluidführende Verbindung der Einzelaggregate miteinander über die Einspeiseleitung eine Art Längsverkettung für die Hydropumpen bildet; und dass durch die trennbare Längsverkettung der Einzelaggregate die jeweiligen hydraulischen Verbraucher, wie Aktoren in Form von Arbeitszylindern oder Hydromotoren, im Eil- oder Schleichgang betreibbar sind oder im Bedarfsfall bei Zuschalten aller Einzelaggregate hohe Leistungen erbringen können.According to claim 1 it is provided that the fluid-carrying connection of the individual units to one another via the feed line forms a type of longitudinal linkage for the hydraulic pumps; and that the respective hydraulic consumers, such as actuators in the form of working cylinders or hydraulic motors, can be operated in rapid or creep speed, or if necessary, due to the separable longitudinal linking of the individual units can achieve high performance when all individual units are switched on.

Dergestalt ist ein modular aufgebautes Antriebssystem geschaffen, bestehend aus mehreren Einzelaggregaten, die vorzugsweise gleich ausgebildet sind und die je nach Anzahl der hydraulischen Verbraucher respektive nach den Leistungsanforderungen im Rahmen des Antriebssystems in wiederlösbarer Weise miteinander koppelbar sind. Dergestalt lässt sich nahezu beliebig an die Versorgungsaufgabe angepasst eine Längsverkettung mit einer Vielzahl von leistungsmäßig benötigten Einzelaggregaten schaffen, was so keine Entsprechung im Stand der Technik hat. In besonders vorteilhafter Weise, kann dabei auch ein einzelnes Antriebsaggregat des Antriebssystems für sich gesehen, für eine spezielle Versorgungsaufgabe Verwendung finden.A modular drive system is created in this way, consisting of several individual units which are preferably of identical design and which can be coupled to one another in a detachable manner depending on the number of hydraulic consumers or the power requirements within the scope of the drive system. In this way, a longitudinal chain with a large number of individual units required in terms of performance can be created in almost any way adapted to the supply task, which has no equivalent in the prior art. In a particularly advantageous manner, a single drive assembly of the drive system can also be used for a special supply task.

Das erfindungsgemäße System lässt sich dadurch unter Ausbilden eines an die jeweiligen Einsatzgegebenheiten angepassten Baukastensystems mit Vorteil bei Arbeitsgerätschaften, wie mobilen Gerätschaften, einsetzen, bei denen mehrere Aktoren mit unterschiedlichem Leistungsbedarf und mit verschiedenen Arbeitsgeschwindigkeiten, wie Eil- oder Schleichgang, zu versorgen sind.The system according to the invention can thus be used advantageously in working equipment, such as mobile equipment, in which several actuators with different power requirements and with different working speeds, such as rapid or creep speed, have to be supplied, forming a modular system adapted to the respective application conditions.

Die Erfindung ermöglicht weiter, dadurch, dass die Hydropumpe jedes modularen Einzelaggregates in die gemeinsame Einspeiseleitung einspeist, ein weitgehendes Downsizing der jeweiligen Antriebe und Hydropumpen. Bei einem beispielsweise drei Einzelaggregate enthaltenden System muss die Nennleistung der drei Antriebe und Pumpen lediglich jeweils einem Drittel des maximalen Gesamtleistungsbedarfs der Einzelaggregate entsprechen. Neben der Kostenersparnis durch kleiner dimensionierte Antriebs- und Pumpeneinheiten, arbeiten diese auch bei kleineren, von den jeweiligen Ventileinrichtungen aus der Einspeiseleitung angeforderten Volumenströmen im energieeffizienten Arbeitsbereich. Die Betätigung der die Einzelaggregate mit der Einspeiseleitung verbindenden Ventile ermöglicht durch das Zuschalten oder Abschalten schnelle Übergänge der Betätigungsart der zu versorgenden Aktoren, wie deren Betrieb im Eil- oder Schleichgang. Mit Vorteil kann beispielsweise eines der Einzelaggregate für den Betrieb von Aktoren mit Schleichgang vorgesehen sein und hierfür mit einer Motorsteuerung versehen sein, die ein feines Justieren kleiner Volumenströme für Schleichgangantrieb ermöglicht, während das Zuschalten weiterer oder aller Einzelaggregate hohe Leistungsanforderungen abdeckt. Ein weiterer Vorteil besteht darin, dass bei Vorhandensein mehrerer Antriebs-Pumpeneinheiten Redundanz für den Fall des Versagens eines Antriebs oder einer Pumpe zur Verfügung steht. Insgesamt ist ein miteinander längsverkettetes Einzelaggregatversorgungskonzept geschaffen, das aufgrund der Wiederholbarkeit der Module besonders kostengünstig in der Realisierung ist.The invention also enables extensive downsizing of the respective drives and hydraulic pumps because the hydraulic pump of each modular individual unit feeds into the common feed line. In a system containing, for example, three individual units, the nominal power of the three drives and pumps only has to correspond to one third of the maximum total power requirement of the individual units. In addition to the cost savings due to the smaller dimensioned drive and pump units, these also work in the energy-efficient working range with smaller volume flows requested by the respective valve devices from the feed line. The actuation of the valves connecting the individual units to the feed line enables rapid transitions in the type of actuation of the actuators to be supplied, such as their operation in rapid or creep speed, by switching them on or off. With Advantageously, for example, one of the individual units can be provided for the operation of actuators with creep speed and this can be provided with a motor controller that enables fine adjustment of small volumetric flows for creep speed drive, while the connection of other or all individual units covers high performance requirements. A further advantage is that if there are several drive-pump units, redundancy is available in the event of a drive or pump failure. Overall, a longitudinally linked individual unit supply concept is created, which is particularly cost-effective to implement due to the repeatability of the modules.

Bei bevorzugten Ausführungsbeispielen besteht ein Einzelaggregat zumindest aus der Hydropumpe mit ihrem Antrieb, der Ventileinrichtung mit Nutzanschlüssen für einen hydraulischen Verbraucher und einem abschnittsweisen Teil der Einspeiseleitung nebst zugehörigem Ventil sowie vorzugsweise einem zugehörigen Versorgungs- oder Vorratstank.In preferred exemplary embodiments, an individual unit consists at least of the hydraulic pump with its drive, the valve device with useful connections for a hydraulic consumer and a section of the feed line together with the associated valve and preferably an associated supply or storage tank.

Mit Vorteil kann die Druckseite der aus einem Tank ansaugenden, jeweiligen Hydropumpe über ein Druckbegrenzungsventil zum Tank hin abgesichert sein, wobei für die Einzelaggregate ein gemeinsamer Tank vorgesehen sein kann.Advantageously, the pressure side of the respective hydraulic pump sucking in from a tank can be secured towards the tank via a pressure-limiting valve, it being possible for a common tank to be provided for the individual units.

Die Einzelaggregate können mit besonderem Vorteil gleich aufgebaut sein. Der Einsatz von Elektromotoren des gleichen Typs vereinfacht auch die Antriebssteuerung. Beispielsweise kann ein Antriebsregler für mehrere Motoren vorgesehen sein.With particular advantage, the individual units can be constructed in the same way. The use of electric motors of the same type also simplifies drive control. For example, a drive controller can be provided for several motors.

Als Antrieb für die jeweilige Hydropumpe kann ein Wechselstrom- oder Gleichstrommotor vorgesehen sein, der bürstenlos oder mit Bürsten versehen ist. Bei Wechselstrommotoren kann zur Regelung mit Vorteil ein Frequenzumsetzer vorgesehen sein.An alternating current or direct current motor, which is brushless or provided with brushes, can be provided as the drive for the respective hydraulic pump. In the case of AC motors, a frequency converter can advantageously be provided for regulation.

Für das Zu- oder Abschalten der Einzelaggregate zu der Einspeiseleitung kann das jeweilige Ventil ein Sperr- oder Schaltventil sein, insbesondere in Form eines elektromagnetisch betätigbaren 2/2-Wegeschaltventils. Mit Wegeventilen sind auch höhere Volumenströme mit geringen Strömungsverlusten steuerbar.For connecting or disconnecting the individual units to the feed line, the respective valve can be a blocking or switching valve, in particular in the form of an electromagnetically actuated 2/2-way switching valve. Directional valves can also be used to control higher volume flows with low flow losses.

Mit besonderem Vorteil kann die Anordnung so getroffen sein, dass jede Ventileinrichtung zumindest aus einem 4/3-Wegeschaltventil gebildet ist, das eingangsseitig an die Einspeiseleitung sowie an einen Rücklauf und ausgangsseitig an gegenseitig hydraulisch entsperrbare Rückschlagventile angeschlossen ist, die jeweils zu einem Nutzanschluss führen. Durch die hydraulisch entsperrbaren Rückschlagventile sind die jeweiligen Aktoren, beispielsweise Hubzylinder, bei einem möglichen Druckverlust gegen eine sicherheitsgefährdende Fehlfunktion abgesichert.With particular advantage, the arrangement can be such that each valve device is formed from at least one 4/3-way switching valve, which is connected on the input side to the feed line and to a return and on the output side to mutually hydraulically piloted check valves, each of which leads to a useful connection. The respective actuators, for example lifting cylinders, are protected against a safety-endangering malfunction in the event of a possible loss of pressure by the hydraulically pilot-operated non-return valves.

Mit Vorteil sind für die Realisierung der Längsverkettung einzelne, miteinander verbindbare Funktionsblöcke in der Art von Einzelmodulen vorgesehen, die jeweils eine Ventileinrichtung aufnehmen und auf einer Seite die Hydropumpe und auf der anderen Seite deren Antrieb aufweisen. Mit solchen Funktionsblöcken lässt sich in besonders vorteilhafter Weise ein modulares Baukastensystem realisieren. Auch lassen sich die Einzelaggregate einer solchen Längsverkettung voneinander separiert auch als Einzelmodule für sich betreiben.Advantageously, individual functional blocks that can be connected to one another in the form of individual modules are provided for the realization of the longitudinal linkage, each of which accommodates a valve device and has the hydraulic pump on one side and its drive on the other side. A modular system can be implemented in a particularly advantageous manner with such function blocks. The individual units of such a longitudinal chain can also be operated separately from one another as individual modules.

Nachstehend ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels im Einzelnen erläutert. Es zeigen:

Fig. 1
eine perspektivische Schrägansicht des Ausführungsbeispiels des erfindungsgemäßen hydraulischen Antriebssystems, gesehen auf die elektromotorische Antriebe aufweisende Seite;
Fig. 2
eine perspektivische Schrägansicht des Ausführungsbeispiels, gesehen auf die Hydropumpen aufweisende Seite; und
Fig. 3
in Symboldarstellung die hydraulische Schaltung des Ausführungsbeispiels.
The invention is explained in detail below using an exemplary embodiment illustrated in the drawing. Show it:
1
a perspective oblique view of the embodiment of the hydraulic drive system according to the invention, seen on the side having electric motor drives;
2
a perspective oblique view of the embodiment, seen on the side having the hydraulic pumps; and
3
in a symbolic representation of the hydraulic circuit of the embodiment.

Mit Bezug auf die beigefügte Zeichnung ist die Erfindung an einem Ausführungsbeispiel erläutert, das drei gleich ausgebildete Einzelaggregate 2 (Fig. 3) aufweist, die jedes einen gleich ausgebildeten Funktionsblock 3, 4 und 5 bilden. Bei diesen handelt es sich jeweils um einen Quader mit zwei gegenüberliegenden Breitseiten 6 und 8 mit quadratischem Umriss und mit schmäleren, rechteckigen Seitenflächen 10, von denen in Fig. 1 und 2 nur eine beziffert ist. An aneinanderliegenden Seitenflächen 10 sind die Funktionsblöcke 3, 4, 5 miteinander verschraubt, so dass sie mit absatzlosen Übergängen zusammen eine Grundplatte bilden. Die Breitseite 6 bildet jeweils die Antriebsseite auf der mit zentral gelegener Antriebswelle jeweils ein Elektromotor 12 gelagert ist, beim vorliegenden Beispiel in Form eines bürstenlosen Wechselstrommotors. Die gegenüberliegende Breitseite 8 bildet die Pumpenseite, auf der jeweils eine Hydropumpe 14 befestigt ist, die vom zugeordneten Elektromotor 12 mit durch den jeweiligen Funktionsblock 3, 4 und 5 hindurchgeführter Antriebswelle direkt angetrieben sind. Bei den Hydropumpen 14 handelt es sich um Konstantpumpen mit drehzahlgesteuerter Förderleistung. Neben den Hydropumpen 14 ist auf der Breitseite 8 jedes Funktionsblockes 3, 4, 5 ein Schaltventil 15, 16 bzw. 17 angeordnet, die in eine Einspeiseleitung 18 eingefügt sind, die, siehe Fig. 3, als sämtlichen Funktionsblöcken 3, 4, 5 gemeinsame Leitung durchgehend zwischen den Seitenflächen 10 verläuft, wobei an den die Anlageflächen bildenden Seitenflächen 10 eine die Leitungsabschnitte der Einspeiseleitung 18 verbindende Fluidverbindung gebildet ist, und wobei einzelne, einander benachbarte Fluidanschlussstellen 20 bei entsprechender Abdichtung die Fluidverbindung im Rahmen der Realisierung der Gesamt-Einspeiseleitung 18 herstellen. Zwischen zwei Anschlussstellen 20 eines Einzelaggregates 2 erstreckt sich dabei der jeweilige Abschnitt der Einspeiseleitung 18, der mit den benachbart angeordneten Abschnitten der weiteren Aggregate 2 die Gesamtleistung 18 ergibt. Außenliegende Anschlussstellen 20 können bei Nichtbelegung mit Anschlussstopfen (nicht dargestellt) verschlossen sein.With reference to the accompanying drawing, the invention is explained using an exemplary embodiment that has three identically designed individual units 2 ( 3 ), which each form an identically designed function block 3, 4 and 5. These are each a cuboid with two opposite broad sides 6 and 8 with a square outline and narrower, rectangular side surfaces 10, of which 1 and 2 only one is numbered. The function blocks 3, 4, 5 are screwed to one another on adjacent side faces 10, so that together they form a base plate with smooth transitions. The broad side 6 in each case forms the drive side on which an electric motor 12 is mounted with a centrally located drive shaft, in the present example in the form of a brushless AC motor. The opposite broad side 8 forms the pump side, on which a hydraulic pump 14 is fastened in each case, which is driven directly by the associated electric motor 12 with a drive shaft passed through the respective function block 3, 4 and 5. The hydraulic pumps 14 are constant pumps with a speed-controlled delivery rate. In addition to the hydraulic pumps 14, a switching valve 15, 16 and 17 is arranged on the broad side 8 of each function block 3, 4, 5, which are inserted into a feed line 18, see 3 , as a line common to all function blocks 3, 4, 5, runs continuously between the side surfaces 10, with a fluid connection connecting the line sections of the feed line 18 being formed on the side surfaces 10 forming the contact surfaces, and with individual, mutually adjacent fluid connection points 20 providing the fluid connection with appropriate sealing produce as part of the realization of the overall feed line 18. Between two connection points 20 of a single unit 2 extends the respective section of the feed line 18, which results in the total output 18 with the adjacently arranged sections of the other units 2. External connection points 20 can be sealed with connection plugs (not shown) if they are not used.

Wie Fig. 3 zeigt, sind die Hydropumpen 14, die aus einem Tank 22 über ein Filter 24 ansaugen, mit ihrer Ausgangsseite über ein Rückschlagventil mit der Einspeiseleitung 18 verbunden. Der Tank 22 mit Belüftungsfilter 28 kann für sämtliche Einzelaggregate 2 gemeinsam sein. Die Ausgangsseite der Hydropumpen 14 ist über ein Druckbegrenzungsventil 30 und eine Rücklaufleitung 32 zum Tank 22 hin abgesichert. Die Schaltventile 15, 16 und 17 sind jedes durch ein 2/2-Wegeventil gebildet, das elektromagnetisch betätigbar und im nicht betätigten Zustand in die Sperrstellung vorgespannt ist. Wie die Fig. 3 zeigt, sind die Schaltventile 15, 16, 17 in die Einspeiseleitung 18 so eingefügt, dass sie den jeweils angeschlossenen Abschnitt der Einspeiseleitung 18 über die Fluidverbindung 20 mit dem Abschnitt der Einspeiseleitung 18 des in der Verkettung nachfolgenden Funktionsblocks 3, 4, 5 verbinden oder trennen. Bei dieser Anordnung sind bei gesperrten Schaltventilen 15, 16, 17 die in den Funktionsblöcken 3, 4 und 5 verlaufenden Abschnitte der Einspeiseleitung 18 lediglich von einer Hydropumpe 14 versorgbar, nämlich der in dem betreffenden Block 3, 4, 5 befindlichen Hydropumpe 14. Bei Öffnen des Schaltventils 15 sind die Funktionsblöcke 3 und 4 zusammengeschaltet, d.h. die Einspeiseleitung 18 ist in beiden Leitungsabschnitten von Funktionsblock 3 und Funktionsblock 4 von den Hydropumpen 14 beider Blöcke 3 und 4 versorgbar, während die Einspeiseleitung 18 im Funktionsblock 5 weiterhin nur von der in diesem Funktionsblock 5 befindlichen Hydropumpe 14 versorgbar ist. Wird das Schaltventil 16 geöffnet, ist auch die Hydropumpe 14 des Funktionsblocks 5 zugeschaltet, so dass, solange Schaltventil 15 ebenfalls geöffnet ist, alle drei Hydropumpen 14 der Einspeiseleitung 18 zugeschaltet sind. Bei Sperren des Schaltventils 15 bleiben wiederum die Hydropumpen 14 aus den Funktionsblöcken 4 und 5 dem in ihnen verlaufenden Abschnitt der Einspeiseleitung 18 zugeschaltet, solange das Schaltventil 16 geöffnet bleibt.How 3 shows, the hydraulic pumps 14, which suck in from a tank 22 via a filter 24, are connected with their output side to the feed line 18 via a non-return valve. The tank 22 with ventilation filter 28 can be common to all individual units 2 . The output side of the hydraulic pump 14 is protected via a pressure relief valve 30 and a return line 32 to the tank 22 . The switching valves 15, 16 and 17 are each formed by a 2/2-way valve which can be actuated electromagnetically and is biased into the blocking position in the non-actuated state. As the 3 shows, the switching valves 15, 16, 17 are inserted into the feed line 18 in such a way that they connect or disconnect the respectively connected section of the feed line 18 via the fluid connection 20 with the section of the feed line 18 of the function block 3, 4, 5 following in the chain . In this arrangement, when the switching valves 15, 16, 17 are blocked, the sections of the feed line 18 running in the function blocks 3, 4 and 5 can only be supplied by one hydraulic pump 14, namely the hydraulic pump 14 located in the block 3, 4, 5 in question of the switching valve 15, the function blocks 3 and 4 are interconnected, i.e. the feed line 18 can be supplied in both line sections of function block 3 and function block 4 by the hydraulic pumps 14 of both blocks 3 and 4, while the feed line 18 in function block 5 continues to be supplied only by the in this function block 5 located hydraulic pump 14 can be supplied. If the switching valve 16 is opened, the hydraulic pump 14 of the function block 5 is also switched on, so that as long as the switching valve 15 is also open, all three hydraulic pumps 14 of the feed line 18 are switched on. When the switching valve 15 is blocked, the hydraulic pumps 14 remain in the function blocks 4 and 5 is switched on to the section of the feed line 18 running in them, as long as the switching valve 16 remains open.

Für die Versorgung von Verbrauchern, wie nicht gezeigte Arbeitszylinder, Fahrantriebe oder Aktoren anderer Art durch die Einzelaggregate 2, weisen die Funktionsblöcke 3, 4 und 5 je eine Ventileinrichtung 34 auf, mittels deren Nutzanschlüsse A und B mit der Einspeiseleitung 18 oder mit der Rücklaufleitung 32 verbindbar sind. Die Ventileinrichtungen 34 weisen ein 4/3-Wegeschaltventil 36 auf, das elektromagnetisch betätigbar ist und dessen eingangsseitigen Anschlüsse mit der Einspeiseleitung 18 und der Rücklaufleitung 32 verbunden sind. Von den ausgangsseitigen Anschlüssen des Wegeschaltventils 36 ist der eine über ein hydraulisch entsperrbares Rückschlagventil 38 mit dem Nutzanschluss A und der andere über ein hydraulisch entsperrbares Rückschlagventil 40 mit dem Nutzanschluss B in Verbindung. Die Rückschlagventile 38 und 40, die in Richtung auf das Wegeschaltventil 36 sperren, sind miteinander so verschaltet, dass sie durch an einem oder am anderen Ausgangsanschluss des Wegeschaltventils 36 anstehenden Versorgungsdruck öffnen. Die Rückschlagventile 38, 40 bilden dadurch eine Sicherheitsschaltung, die bei fehlendem Versorgungsdruck einen Rückstrom von den Verbrauchern und damit einen möglicherweise sicherheitsgefährdenden Funktionsverlust verhindert.For the supply of consumers, such as working cylinders, traction drives or other types of actuators (not shown) through the individual units 2, the function blocks 3, 4 and 5 each have a valve device 34, by means of which useful connections A and B are connected to the feed line 18 or to the return line 32 are connectable. The valve devices 34 have a 4/3-way switching valve 36 which can be actuated electromagnetically and whose inlet-side connections are connected to the feed line 18 and the return line 32 . One of the outlet-side connections of the directional control valve 36 is connected to the useful port A via a hydraulically pilot-operated check valve 38 and the other is connected to the user port B via a hydraulically pilot-operated check valve 40 . The check valves 38 and 40, which block in the direction of the directional control valve 36, are interconnected in such a way that they open due to the supply pressure present at one or the other output connection of the directional control valve 36. The non-return valves 38, 40 thereby form a safety circuit which, in the event of a lack of supply pressure, prevents a backflow from the consumers and thus a loss of function which may endanger safety.

Mit der erfindungsgemäß vorgesehenen Längsverkettung der Einzelaggregate 2 ist ein Baukastensystem realisierbar, bei dem, je nach Trennen von Funktionsblöcken 3, 4, 5 von der Einspeiseleitung 18 oder dem Zuschalten zur Einspeiseleitung 18 jeweilige Verbraucher in unterschiedlicher Weise versorg- und antreibbar sind. Beispielsweise sind verschiedene Aktoren gleichzeitig im Eil- oder Schleichgang betreibbar. In Fall einer hohen Leistungsanforderung sämtlicher Aktoren steht durch Zusammenschalten aller Einzelaggregate 2 die gesamte Förderleistung der Hydropumpen 14 zur Verfügung. Ein für Schleichgangbetrieb vorgesehenes Einzelaggregat 2 kann mit Vorteil mittels Frequenzsteuerung des Elektromotors 12 in der Leistung feinjustierbar ausgelegt sein, während weitere Elektromotoren 12, beispielsweise gemeinsam, mit weniger aufwendiger Steuerung betreibbar sind.With the longitudinal chaining of the individual units 2 provided according to the invention, a modular system can be implemented in which, depending on the separation of function blocks 3, 4, 5 from the feed line 18 or the connection to the feed line 18, respective consumers can be supplied and driven in different ways. For example, different actuators can be operated simultaneously in rapid or creep speed. In the event of a high power requirement from all actuators, the entire delivery capacity of the hydraulic pumps 14 is available by interconnecting all the individual units 2 . An individual unit 2 provided for creep speed operation can advantageously be finely adjusted in terms of power by means of frequency control of the electric motor 12 be designed while other electric motors 12, for example together, can be operated with less complex control.

Claims (8)

  1. Hydraulic drive system, consisting of at least two individual units (2), each of which has a hydraulic pump (14) which can be operated by means of a drive (12) and which feeds pressurised fluid into a common feed line (18) on the outlet side, to which, associated with each individual unit (2), at least one valve device (34) is connected for supplying a respective consumer, wherein two adjacent individual units (2) are separated from each other or connected to each other in a fluid-conducting manner by means of a valve (15, 16, 17) in the feed line (18), wherein the at least two individual units are of modular design, form a longitudinal chain with each other when strung together and each have a section of the feed line (18), wherein the respective sections of the feed line (18) are connected to each other by fluid connection points (20), which can be separated from each other, between the adjacently arranged individual units (2), wherein the fluid-conducting connection of the individual units (2) to each other via the feed line (18) forms a type of longitudinal chain for the hydraulic pumps (14); and wherein, due to the separable longitudinal chain of the individual units (2), the respective hydraulic consumers, such as actuators in the form of working cylinders or hydraulic motors, can be operated at rapid or creep speed or, if necessary, can produce high outputs when all individual units (2) are connected.
  2. Hydraulic drive system according to claim 1, characterised in that an individual unit (2) consists at least of - the hydraulic pump (14) with its drive (12);
    - the valve device (34) with work ports (A, B) for a hydraulic consumer;
    - a section of the feed line (18); together with
    - associated valve (15, 16, 17); and
    - preferably a storage tank (22).
  3. Hydraulic drive system according to claim 1 or 2, characterised in that all individual units (2) are of identical design.
  4. Hydraulic drive system according to one of the preceding claims, characterised in that the drive is an AC or DC motor (12) which is brushless or equipped with brushes.
  5. Hydraulic drive system according to one of the preceding claims, characterised in that the respective valve is a switching valve, in particular an electromagnetically actuated 2/2-way switching valve (15, 16, 17).
  6. Hydraulic drive system according to one of the preceding claims, characterised in that each valve device (34) is formed at least from a 4/3-way switching valve (36) which is connected on the inlet side to the feed line (18) and a return line (32) and on the outlet side to mutual pilot-operated hydraulic check valves (38, 40), each of which leads to a work port (A or B).
  7. Hydraulic drive system according to one of the preceding claims, characterised in that, for implementing the longitudinal chain, individual functional blocks (3, 4, 5) which can be connected to each other are provided, each of which accommodates a valve device (34) and has the hydraulic pump (14) on one side and its drive (12) on the other side.
  8. Hydraulic drive system according to one of the preceding claims, characterised in that the individual units (2) of a longitudinal chain can also function as individual modules on their own when separated from each other.
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EP3931450C0 (en) 2023-08-02
WO2020229405A1 (en) 2020-11-19
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