EP3880975A1 - Electro-hydrostatic actuator system - Google Patents

Electro-hydrostatic actuator system

Info

Publication number
EP3880975A1
EP3880975A1 EP19790498.0A EP19790498A EP3880975A1 EP 3880975 A1 EP3880975 A1 EP 3880975A1 EP 19790498 A EP19790498 A EP 19790498A EP 3880975 A1 EP3880975 A1 EP 3880975A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
chamber
axis
valve
line
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
EP19790498.0A
Other languages
German (de)
French (fr)
Other versions
EP3880975B1 (en
Inventor
Sascha DANY
Rainer Kohlhaas
Kristof SCHLEMMER
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.)
Moog Luxembourg SARL
Original Assignee
Moog Luxembourg SARL
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 Moog Luxembourg SARL filed Critical Moog Luxembourg SARL
Publication of EP3880975A1 publication Critical patent/EP3880975A1/en
Application granted granted Critical
Publication of EP3880975B1 publication Critical patent/EP3880975B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
    • 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
    • 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
    • F15B1/021—Installations or systems with accumulators used for damping
    • 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
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • 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
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating 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
    • 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
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • 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
    • F15B2211/20546—Type of pump variable 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
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible
    • 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
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • 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
    • 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
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—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
    • 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
    • F15B2211/31541—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 a single pressure source and 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
    • F15B2211/31552—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a 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
    • F15B2211/61—Secondary circuits
    • F15B2211/613—Feeding circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel

Definitions

  • the present invention relates to an electrohydrostatic actuator system and in particular to an electrohydrostatic actuator system with two movable axes.
  • Electrohydrostatic actuator systems are largely known in the prior art, usually only one consumer being operated by one actuator at a time. If several consumers are used in the system, several actuators are required in the prior art.
  • a constant pressure system can be provided for the use of several actuators. This is either continuously or non-continuously fed by a pump train, whereby if peak performances are required, these are delivered via a storage system.
  • a pump train whereby if peak performances are required, these are delivered via a storage system.
  • a storage system consumes a lot of energy and has a heavy control, which is why improved actuator systems are required.
  • the electrohydrostatic actuator system comprises a volume and / or speed-variable hydraulic machine driven by an electric motor, for providing a volume flow of a hydraulic fluid, and a main axis movable by the hydraulic fluid with at least one first chamber, the first chamber being hydraulically connected to the hydraulic machine via at least one first main hydraulic line and one first main valve via a connecting line.
  • the actuator system comprises a secondary axis which can be moved by the hydraulic fluid and has at least one first chamber, the first chamber being hydraulically connected to the hydraulic machine via at least one first secondary hydraulic line and a first secondary valve via a connecting line.
  • Secondary hydraulic line hydraulically connected in the area between the first chamber of the secondary axis and the first secondary valve.
  • an electrohydrostatic actuator system which has a volume and / or speed-variable hydraulic machine driven by an electric motor and a main axis and a secondary axis, each with at least one chamber.
  • the at least one chamber of the main and secondary axes is hydraulically connected to a main or secondary hydraulic line and to the hydraulic machine via a main or secondary valve. There is a between the chamber of the secondary axis and the secondary valve
  • Hydraulic accumulator arranged, which is hydraulically connected to the secondary hydraulic line.
  • Electric motors are known in the prior art and serve to drive the hydraulic machine.
  • the hydraulic machine is variable in volume and / or speed and can preferably operate in two possible directions of flow of the hydraulic fluid in the closed mode
  • the hydraulic machine can also have either a variable-speed electric motor and a constant pump or a constant-speed electric motor and a variable displacement pump or one
  • variable-speed electric motor and a variable displacement pump.
  • the hydromachine is determined by factors such as system costs, reliability, approved noise emissions or efficiency.
  • the axes of the actuator system according to the invention are movable, whereby
  • Hydraulic fluid and the associated pressure build-up or pressure reduction is provided.
  • the main axis can be a forming axis and the secondary axis can be a clamping axis.
  • a workpiece to be machined is clamped by the clamping axis and by the
  • Forming axis (reshaping).
  • the axes can also have further functions.
  • the main axis and / or the secondary axis is mechanically and in particular preloaded with a spring system and / or a weight system.
  • the present invention is particularly advantageous since a process which requires two axes can be controlled by means of a single hydraulic machine - as will be explained in more detail later.
  • main and secondary should not be understood to mean that one of the axes is more important than the other, but only serve the
  • both axes can also perform the same function, such as clamping a workpiece.
  • Both the main axis and the secondary axis have at least one first chamber into which hydraulic fluid can flow.
  • the chambers are each hydraulically connected to a connection of the hydraulic machine via a line and a valve.
  • the hydraulic machine operated by the electric motor thus provides a hydraulic fluid flow in the respective first chambers of the main and
  • Arrangement of the hydraulic accumulator according to the invention is achieved by clamping the Hydraulic fluids of the secondary axis also clamped the hydraulic fluid in the hydraulic accumulator, so that the pressure of the hydraulic fluid in the first chamber
  • Secondary axis corresponds to the pressure of the hydraulic fluid in the hydraulic accumulator.
  • the hydraulic machine can be used, after clamping the secondary axis, to clamp or control the primary axis.
  • the primary axis can be operated by means of the same hydraulic machine, in particular a parallel operation of both axes by means of a single one
  • the hydraulic fluid is biased in the connection lines.
  • the prestressing can be provided, for example, by means of a further hydraulic machine, a pressure accumulator or the like.
  • the connecting lines are the lines that the main or
  • the pressure in the connecting lines can be 10 bar, for example. Main reason for that
  • Biasing is to ensure a minimum pressure in the two
  • the first secondary hydraulic line can be hydraulically connected to a drain line and a safety valve and / or a 2-way valve, in particular a drain valve.
  • Such a drain system can also be used and arranged accordingly on the main hydraulic line. Accordingly, the drain lines of the main hydraulic line and the secondary hydraulic line can also be the same. It is also within the meaning of the invention that the hydraulic fluid expanded in the discharge line flows into a tank, where it can be used for further purposes.
  • the tank can be the same tank that is used to feed hydraulic fluid into the system, thereby providing a closed system.
  • cleaning, venting and / or cooling devices can also be connected to the drain line, so that, for example, the hydraulic fluid is vented, for example, before it is fed back into the system.
  • the connecting line can also be arranged in such a way that it only serves to relax the hydraulic accumulator, while the first chamber of the secondary axis is relaxed by means of a further line, for example by means of the connecting line, which is also connected to the tank. This allows you to control exactly where the pressure relief is to take place.
  • the hydraulic machine can be used to relax the chambers of the main and / or secondary axis.
  • the hydraulic machine can provide a hydraulic fluid flow from one of the chambers into the tank by means of a swallow flow.
  • the first chamber of the main axis and the first chamber of the secondary axis are the same
  • Hydraulic machine connection line hydraulically connected.
  • the further connecting line of the hydraulic machine can, for example, be hydraulically connected to the tank from which the hydraulic fluid is used to clamp the actuator system. Only by setting the main or secondary valve is it possible to set in which of the chambers a hydraulic fluid flow is provided by the hydraulic machine. For this it is advantageous and a further one according to the invention
  • the first main valve and / or the first secondary valve are controlled valves.
  • both valves can be controlled, since this enables an improved and more precise actuator control and the process sequences can thus be controlled more easily.
  • the secondary valve can also be a continuous valve, so that a local constant pressure system is generated by the hydraulic accumulator and the valve.
  • the control can take place in any way known in the prior art, for example by means of electrically controlled valves.
  • the main axis has at least one second chamber, the second chamber having at least one second main hydraulic line and one second main valve
  • Connection line is hydraulically connected to the hydraulic machine.
  • the secondary axis also has at least one second chamber, the second chamber being hydraulically connected to the hydraulic machine with at least one second secondary hydraulic line and a second secondary valve via a connecting line.
  • the main axis and the secondary axis can be selected from a group which contains, for example, differential cylinders, common-mode cylinders, telescopic cylinders and similar cylinders.
  • the choice of axis typology depends on the function that the axes must perform; for example, the main axis can be a differential cylinder if the axis is used in a press.
  • the main axis and secondary axis do not necessarily have to be designed as the same cylinder type.
  • both the main axis and the secondary axis each have a second chamber
  • the second chamber of the main axis and the second chamber of the secondary axis are hydraulically connected to the same connecting line of the hydraulic machine
  • Connection line is different from the connection line with which the first chamber of the main and secondary axes is hydraulically connected. It is advantageous if the respective second chambers of the axes are connected on the same line, since fewer lines are thus used and the system can be operated in a simplified manner.
  • the first main valve and the first secondary valve As for the first main valve and the first secondary valve, the first main valve and the first secondary valve
  • At least one of the controlled valves can be unlocked by means of a control valve.
  • At least one of the control valves is hydraulically connected to at least one of the connecting lines of the hydraulic machine by means of check valves.
  • Hydraulic fluid which is in the system thus also flows through the circuits of the control valves, as a result of which no additional clamping and in particular no additional independent control circuit is required.
  • the main axis and the secondary axis are operated in parallel or sequentially by the same hydraulic machine.
  • the parallel operation of the axes generally consists of several steps.
  • the secondary axis is clamped by means of the hydraulic machine, the hydraulic accumulator or hydraulic fluid in the hydraulic accumulator also being clamped by clamping the first chamber of the secondary axis. If there is sufficient pressure in the first chamber of the secondary axis, the connection to the hydraulic machine is interrupted by means of the secondary valve. Since the clamped hydraulic accumulator is connected to the chamber of the secondary axis, the remains
  • an actuator system according to the invention is also claimed by means of one of the methods described above.
  • the system can be used for forming molded parts, for deep-drawing molded parts or by other similar processes in which an electrohydrostatic actuator system is required.
  • Fig. 2 is a schematic representation of an exemplary embodiment of the
  • FIG. 1 system according to the invention according to FIG. 1;
  • FIG. 4 shows a schematic illustration of a further exemplary embodiment of the system according to the invention according to FIG. 1;
  • FIG. 5 shows a schematic illustration of a further exemplary embodiment, the secondary axis being pretensioned
  • FIG. 6 a schematic representation of a further exemplary embodiment of the system according to the invention according to FIG. 5;
  • FIG. 1 shows a general arrangement of an exemplary embodiment of the actuator system 1 according to the invention with two movable axes.
  • the exemplary embodiment of the actuator system 1 according to the invention has a volume and / or speed variable driven by an electric motor 10
  • Hydraulic machine 11 for providing a volume flow of a hydraulic fluid.
  • the system 1 also has a main axle 20, which is designed as a differential cylinder with a first chamber 22 and a second chamber 24, the first chamber 22 through a first main hydraulic line 52 and through a first connection line 12 and the second chamber 24 through a second Main hydraulic line 54 and through a second connection line 14, each with a connection of the
  • Hydraulic machine 11 are hydraulically connected.
  • a first and a second main valve 23 and 25 are located between the hydraulic machine and the first and the second chamber 22, 24 of the main axis 20
  • a valve arrangement 90 and a hydraulic accumulator 40 are hydraulically connected to the secondary axis 30. Some embodiments of how the valve arrangement 90 is designed are explained in the next figures.
  • the arrangement should be such that it is possible to operate both the main axis 20 and the secondary axis 30 sequentially and / or in parallel by means of a single hydraulic machine 11. It is important, for example, that the valve arrangement 90 can be used to block a hydraulic fluid flow from the first and / or second chambers 32, 34 of the secondary axis 30 in the direction of or to the hydraulic machine 11 as desired, so that the hydraulic machine 11 mainly points to the main axis 20 acts. Furthermore, the valve arrangement 90 should be designed in such a way that the first and / or second chambers 32, 34 of the secondary axis 30 can be relaxed.
  • the system 1 has a source 80 and a biasing source 82, which serve to bias the connecting lines 12 and 14 of the hydraulic machine 11.
  • the hydraulic machine 11 is also hydraulically connected to a tank 84, from which the hydraulic machine 11 takes hydraulic fluid and feeds it into the system.
  • Another line 98b with a further unlockable valve 94 serves both for the hydraulic connection of the source 80 and the biasing source 82 with the
  • Hydraulic machine 11 as well as to relax the second chamber 24, 34 of the main and / or secondary axis 20, 30.
  • a drain line 42 can be hydraulically connected to an unlockable valve 43 at the connection of the hydraulic accumulator and to the tank 84.
  • Hydraulic accumulator 40 can be relaxed by means of the additional line 42 and the unlockable valve 43.
  • FIG. 2 shows an exemplary embodiment of the system according to the invention from FIG. 1. The general structure of system 1 is unchanged.
  • the arrangement of the valves on the secondary axis 30 differs.
  • the secondary axis 30 is shown as a differential cylinder, the arrangement of a synchronous cylinder also being conceivable.
  • the secondary axis 30 has a first chamber 32 and one through the first
  • Secondary hydraulic line 62 with the first chamber 32 connected hydraulic accumulator 40, and a second chamber 34.
  • the valve arrangement 90 comprises a secondary valve 33, the first chamber 32 and the second chamber 34 of the secondary axis through the first
  • the first secondary valve 33 is a 4/2-way valve 33 with a flow position and a blocking position, so that both the first secondary hydraulic line 62 and the second secondary hydraulic lines 64 are either open simultaneously or blocked simultaneously.
  • the hydraulic machine 11 can work directly in the two chambers 32, 34 of the secondary axis 30 and in the hydraulic accumulator 40.
  • the hydraulic machine 11 can provide a hydraulic fluid flow into the first chamber 32 of the secondary axis 30 and into the hydraulic accumulator 40, so that the secondary axis 30 is clamped while hydraulic fluid is withdrawn from the second chamber 34.
  • the secondary valve 33 can be set to flow and the valves 92 and / or 94 can be unlocked so that hydraulic fluid can flow into the preload source 82.
  • Hydraulic accumulator 40 can be relieved directly into the tank 84 by means of a valve 43 and a drain line 42.
  • Figure 3 shows a similar exemplary embodiment of the actuator system according to the invention as Figure 2, wherein the valve assembly 90 instead of a single secondary valve, a first secondary valve 33 which is connected to the first
  • Secondary hydraulic line 62 is arranged and comprises a second secondary valve 35, which is arranged on the second secondary hydraulic line 64.
  • both the first and the second secondary valve 33, 35 are controlled 2/2-way valves, each with a flow and a blocking division.
  • FIG. 4 shows an exemplary alternative embodiment of the system 1 according to the invention according to one of the previous figures.
  • the valve arrangement 90 comprises a 4/3-way valve 33 with a throughflow
  • Secondary hydraulic line 62 and the second secondary hydraulic line 64 is arranged and a 2/2-way valve 35 with a flow and blocking position, which is arranged on a line that the hydraulic accumulator 40 and
  • a drain line 94 is connected to the 4/3-way valve 33, so that either the first chamber 32 or the second chamber 34 of the secondary axis 30 is connected to the drain line 94 at the respective flow positions. Furthermore, the drain line 94 is hydraulically connected to the tank 84, so that when the hydraulic fluid is released from one of the two chambers 32, 34, it can flow directly into the tank 84.
  • the second secondary valve 35 blocks the connection of the secondary axis 30 and the hydraulic accumulator 40 to the connecting line 12 and accordingly to the rest of the system 1.
  • the hydraulic accumulator 40 can be expanded, for example, by means of the second secondary valve 35, through the line 12, 98a and by unlocking the valve 92 or, as shown in the previous figures, by an alternative line 42.
  • the secondary axis 30 can also be a preloaded cylinder instead of a differential cylinder.
  • the cylinder can be pretensioned by means of a spring or also by means of a weight system, the cylinder having at least one ventilation device on its pretensioned chamber 34, so that the air can escape during the pressing process.
  • valve arrangement 90 in this example comprises according to the invention
  • Embodiment a 2-way valve 33 with a flow and a blocking position; the first chamber 32 of the secondary axis 30 through the first hydraulic line 62 and the secondary valve 33 with the connecting line 12, or with the hydraulic machine 11 hydraulically connected.
  • the pressure accumulator 40 is also hydraulically connected both to the secondary hydraulic line 62 and to the secondary valve 33.
  • the secondary valve 33 and the controlled valve 92 can be unlocked, for example, so that the relaxed hydraulic fluid flows into the preload source 82.
  • the hydraulic accumulator 40 can also be hydraulically connected to a drain valve 43 on the tank 84 by a drain line 42. In this embodiment, however, the first chamber 32 is only possible at the same time as the
  • Hydraulic accumulator 40 to relax.
  • the selected valve arrangement 90 can be used to relax the first chamber 32 of the secondary axis 30 and the hydraulic accumulator 40 individually or together.
  • the valve assembly 90 includes one with the secondary hydraulic line
  • valve arrangement comprises a second secondary valve 35 which, as in the previous example as a 2-way valve, connects the connection line 12 to the secondary axis 30 and / or the hydraulic accumulator 40.
  • first main hydraulic line main axis 54 second main hydraulic line first chamber of the main axis 62 first secondary hydraulic line first main valve 64 second secondary hydraulic line second chamber of the main axis 80 source

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Abstract

The electro-hydrostatic actuator system according to the invention comprises a volume-variable and/or rotational-speed-variable hydro machine, which is driven by an electric motor, for providing a volume flow of an hydraulic fluid, and a main shaft which is movable by the hydraulic fluid and which has at least one first chamber, wherein the first chamber, with at least one first main hydraulic line and a first main valve, is hydraulically connected to the hydro machine via a connection line. The actuator system according to the invention further comprises a secondary shaft which is movable by the hydraulic fluid and which has at least one first chamber, wherein the first chamber, with at least one first secondary hydraulic line and a first secondary valve, is hydraulically connected to the hydro machine via a connection line. Furthermore, according to the invention, a hydraulic accumulator is hydraulically connected to the first secondary hydraulic line in the area between the first chamber of the secondary shaft and the first secondary valve.

Description

Elektrohydrostatisches Aktuatorsystem  Electrohydrostatic actuator system
Die vorliegende Erfindung betrifft ein elektrohydrostatisches Aktuatorsystem und insbesondere ein elektrohydrostatisches Aktuatorsystem mit zwei beweglichen Achsen. The present invention relates to an electrohydrostatic actuator system and in particular to an electrohydrostatic actuator system with two movable axes.
Im Stand der Technik sind elektrohydrostatische Aktuatorsysteme weitgehend bekannt, wobei üblicherweise jeweils nur ein Verbraucher durch einen Aktuator betrieben wird. Werden mehrere Verbraucher im System verwendet, dann werden im Stand der Technik mehrere Aktuatoren benötigt. Electrohydrostatic actuator systems are largely known in the prior art, usually only one consumer being operated by one actuator at a time. If several consumers are used in the system, several actuators are required in the prior art.
Sobald mehrere Verbraucher gleichzeitig mit einer oder mehreren parallelen As soon as several consumers simultaneously with one or more parallel
Pumpeneinheiten betrieben werden, wird der Volumenstrom den Weg des geringsten Widerstandes nehmen und die Verbraucher, beispielsweise die Achsen, bewegen sich Undefiniert, was zu einem nicht steuerbaren System führt. Pump units are operated, the volume flow will take the path of least resistance and the consumers, for example the axes, move undefined, which leads to a non-controllable system.
Weiterhin kann zur Verwendung von mehreren Aktuatoren ein Konstantdrucksystem bereitgestellt werden. Dieses wird entweder kontinuierlich oder nicht kontinuierlich durch einen Pumpenstrang gespeist, wobei wenn Spitzenleistungen benötigt werden, diese über einen Speichersystem abgegeben werden. Ein solches System verbraucht jedoch viel Energie und weist eine schwere Steuerung auf, weswegen verbesserte Aktuatorysteme benötigt werden. Furthermore, a constant pressure system can be provided for the use of several actuators. This is either continuously or non-continuously fed by a pump train, whereby if peak performances are required, these are delivered via a storage system. However, such a system consumes a lot of energy and has a heavy control, which is why improved actuator systems are required.
Ausgehend von diesem Stand der Technik ist es somit Aufgabe der vorliegenden Erfindung, die Nachteile des Standes der Technik wenigstens teilweise zu überwinden oder zu verbessern. Starting from this prior art, it is therefore an object of the present invention to at least partially overcome or improve the disadvantages of the prior art.
Die Aufgabe wird mit einer Vorrichtung gemäß Anspruch 1 gelöst. Bevorzugte The object is achieved with a device according to claim 1. Preferred
Ausführungsformen und Abwandlungen sind Gegenstand der Unteransprüche. Ein erfindungsgemäßes Verfahren zur Verwendung des erfindungsgemäßen Systems wird in den Ansprüchen 15 und 16 spezifiziert. Embodiments and modifications are the subject of the dependent claims. A method according to the invention for using the system according to the invention is specified in claims 15 and 16.
Das erfindungsgemäße elektrohyd rostatische Aktuatorsystem umfasst dabei eine von einem Elektromotor angetriebene volumen- und/oder drehzahl-variable Hydromaschine, zur Bereitstellung eines Volumenstroms eines Hydraulikfluids, und eine durch das Hydraulikfluid bewegbare Hauptachse mit mindestens einer ersten Kammer, wobei die erste Kammer mit wenigstens einer ersten Haupthydraulikleitung und einem ersten Hauptventil über eine Anschlussleitung mit der Hydromaschine hydraulisch verbunden ist. The electrohydrostatic actuator system according to the invention comprises a volume and / or speed-variable hydraulic machine driven by an electric motor, for providing a volume flow of a hydraulic fluid, and a main axis movable by the hydraulic fluid with at least one first chamber, the first chamber being hydraulically connected to the hydraulic machine via at least one first main hydraulic line and one first main valve via a connecting line.
Weiterhin umfasst das erfindungsgemäße Aktuatorsystem eine durch das Hydraulikfluid bewegbare Sekundärachse mit mindestens einer ersten Kammer, wobei die erste Kammer mit wenigstens einer ersten Sekundärhydraulikleitung und einem ersten Sekundärventil über eine Anschlussleitung mit der Hydromaschine hydraulisch verbunden ist. Furthermore, the actuator system according to the invention comprises a secondary axis which can be moved by the hydraulic fluid and has at least one first chamber, the first chamber being hydraulically connected to the hydraulic machine via at least one first secondary hydraulic line and a first secondary valve via a connecting line.
Erfindungsgemäß ist weiterhin ein Hydrospeicher mit der ersten According to the invention there is also a hydraulic accumulator with the first
Sekundärhydraulikleitung im Bereich zwischen der ersten Kammer der Sekundärachse und dem ersten Sekundärventil hydraulisch verbunden.  Secondary hydraulic line hydraulically connected in the area between the first chamber of the secondary axis and the first secondary valve.
Erfindungsgemäß wird dementsprechend, ein elektrohydrostatisches Aktuatorsystem bereitgestellt, welches eine von einem Elektromotor angetriebene volumen- und/oder drehzahl-variable Hydromaschine und eine Hauptachse und eine Sekundärachse, mit jeweils mindestens einer Kammer, aufweist. Die mindestens eine Kammer der Haupt- und Sekundärachse ist jeweils mit einer Haupt- bzw. Sekundärhydraulikleitung und über ein Haupt- bzw. Sekundärventil mit der Hydromaschine hydraulisch verbunden. Zwischen der Kammer der Sekundärachse und dem Sekundärventil ist ein According to the invention, an electrohydrostatic actuator system is accordingly provided which has a volume and / or speed-variable hydraulic machine driven by an electric motor and a main axis and a secondary axis, each with at least one chamber. The at least one chamber of the main and secondary axes is hydraulically connected to a main or secondary hydraulic line and to the hydraulic machine via a main or secondary valve. There is a between the chamber of the secondary axis and the secondary valve
Hydrospeicher angeordnet, welcher mit der Sekundärhydraulikleitung hydraulisch verbunden ist. Hydraulic accumulator arranged, which is hydraulically connected to the secondary hydraulic line.
Elektromotoren sind im Stand der Technik bekannt und dienen zum Antrieb der Hydromaschine.  Electric motors are known in the prior art and serve to drive the hydraulic machine.
Die Hydromaschine ist volumen- und/oder drehzahl-variabel und kann vorzugsweise im Betrieb zwei mögliche Flussrichtungen des Hydraulikfluids im geschlossenen The hydraulic machine is variable in volume and / or speed and can preferably operate in two possible directions of flow of the hydraulic fluid in the closed mode
Hydraulikkreislauf bereitstellen. Die Hydromaschine kann ferner entweder einen drehzahl-variablen Elektromotor aufweisen und eine Konstantpumpe oder einen drehzahl-konstanten Elektromotor und eine Verstell pumpe oder einen Provide the hydraulic circuit. The hydraulic machine can also have either a variable-speed electric motor and a constant pump or a constant-speed electric motor and a variable displacement pump or one
drehzahl-variablen Elektromotor und eine Verstell pumpe. Die Auswahl der variable-speed electric motor and a variable displacement pump. The selection of the
Hydromaschine wird dabei von Faktoren wie z.B. Systemkosten, Zuverlässigkeit, zugelassene Geräuschemission oder Wirkungsgrad bestimmt. Die Achsen des erfindungsgemäßen Aktuatorsystems sind beweglich, wobei The hydromachine is determined by factors such as system costs, reliability, approved noise emissions or efficiency. The axes of the actuator system according to the invention are movable, whereby
vorzugsweise die Bewegung durch in den Kammern ein- oder austretendes preferably the movement by entering or leaving the chambers
Hydraulikfluid und den damit verbundenen Druckauf- oder Druckabbau bereitgestellt wird. Hydraulic fluid and the associated pressure build-up or pressure reduction is provided.
Beispielsweise kann gemäß einer erfindungsgemäßen Ausführungsform die Hauptachse eine Umformungsachse und die Sekundärachse eine Spannachse sein. Dabei wird ein zu bearbeitendes Werkstück durch die Spannachse aufgespannt und durch die For example, according to an embodiment of the invention, the main axis can be a forming axis and the secondary axis can be a clamping axis. A workpiece to be machined is clamped by the clamping axis and by the
Umformungsachse (Um-)geformt. Gemäß jedoch weiterer Ausführungsformen können die Achsen auch weitere Funktionen haben. Forming axis (reshaping). However, according to further embodiments, the axes can also have further functions.
Gemäß einer weiteren erfindungsgemäßen Ausführungsform des Aktuatorsystems ist die Hauptachse und/oder die Sekundärachse mechanisch und insbesondere mit einem Federsystem und/oder einem Gewichtssystem vorgespannt. According to a further embodiment of the actuator system according to the invention, the main axis and / or the secondary axis is mechanically and in particular preloaded with a spring system and / or a weight system.
Vorteilhaft ist dabei insbesondere, die Verwendung der Achsen für den gleichen Prozessablauf und nicht für unterschiedliche und miteinander nicht korrelierte It is particularly advantageous here that the axes are used for the same process flow and not for different ones that are not correlated with one another
Funktionen. Sind nämlich die Funktionen miteinander verbunden, so ist die vorliegende Erfindung besonders vorteilhaft, da mittels einer einzigen Hydromaschine - wie später mehr im Detail erklärt wird - ein Prozess, welches zwei Achsen benötigt, gesteuert werden kann. Functions. If the functions are connected to one another, the present invention is particularly advantageous since a process which requires two axes can be controlled by means of a single hydraulic machine - as will be explained in more detail later.
Die Begriffe„Haupt-" und„Sekundärachse" sollen nicht dahingehend verstanden sein, dass eine der Achsen wichtiger ist als die andere, sondern dienen nur der The terms "main" and "secondary" should not be understood to mean that one of the axes is more important than the other, but only serve the
Unterscheidung der Achsen; insbesondere können auch beide Achsen eine gleiche Funktion ausführen, wie beispielsweise das Aufspannen eines Werkstücks. Differentiation of axes; in particular, both axes can also perform the same function, such as clamping a workpiece.
Sowohl die Hauptachse als auch die Sekundärachse weisen mindestens eine erste Kammer, in die Hydraulikfluid strömen kann, auf. Die Kammern sind jeweils über eine Leitung und über ein Ventil mit einem Anschluss der Hydromaschine hydraulisch verbunden. Die durch den Elektromotor betriebene Hydromaschine stellt somit eine Hydraulikfluidströmung in den jeweiligen ersten Kammern der Haupt- und Both the main axis and the secondary axis have at least one first chamber into which hydraulic fluid can flow. The chambers are each hydraulically connected to a connection of the hydraulic machine via a line and a valve. The hydraulic machine operated by the electric motor thus provides a hydraulic fluid flow in the respective first chambers of the main and
Sekundärachse bereit, wodurch eine Bewegung der Achsen erfolgt. Secondary axis ready, which causes the axes to move.
Vorteilhaft bei dieser erfindungsgemäßen Ausführungsform ist dabei die Anordnung des Hydrospeichers an der ersten Sekundärhydraulikleitung im Bereich zwischen der ersten Kammer der Sekundärachse und dem ersten Sekundärventil. Durch die The arrangement of the hydraulic accumulator on the first secondary hydraulic line in the region between the first chamber of the secondary axis and the first secondary valve is advantageous in this embodiment according to the invention. Through the
erfindungsgemäße Anordnung des Hydrospeichers wird durch das Aufspannen des Hydraulikfluids der Sekundärachse auch das Hydraulikfluid im Hydrospeicher aufgespannt, so dass der Druck des Hydraulikfluids in der ersten Kammer der Arrangement of the hydraulic accumulator according to the invention is achieved by clamping the Hydraulic fluids of the secondary axis also clamped the hydraulic fluid in the hydraulic accumulator, so that the pressure of the hydraulic fluid in the first chamber
Sekundärachse dem Druck des Hydraulikfluids im Hydrospeicher entspricht. Secondary axis corresponds to the pressure of the hydraulic fluid in the hydraulic accumulator.
Somit ist es möglich, durch schließen des Sekundärventils, den Druck im Bereich der ersten Kammer der Sekundärachse sowie in der Sekundärhydraulikleitung mittels des Hydraulikspeicher aufrecht zu erhalten, ohne die Hydromaschine für den Druckerhalt zu benötigen. It is thus possible, by closing the secondary valve, to maintain the pressure in the region of the first chamber of the secondary axis and in the secondary hydraulic line by means of the hydraulic accumulator without the need for the hydraulic machine to maintain the pressure.
Die Hydromaschine kann dementsprechend, nach dem Aufspannen der Sekundärachse, zum Aufspannen bzw. zur Steuerung der Primärachse verwendet werden. Somit kann die Primärachse mittels der gleichen Hydromaschine betrieben werden, wobei insbesondere ein paralleles Arbeiten beider Achsen, mittels einer einzigen Accordingly, the hydraulic machine can be used, after clamping the secondary axis, to clamp or control the primary axis. Thus, the primary axis can be operated by means of the same hydraulic machine, in particular a parallel operation of both axes by means of a single one
Hydromaschine möglich ist. Hydro machine is possible.
Die Verwendung einer einzigen Hydromaschine zur parallelen Steuerung von zwei Achsen ist vorteilhaft, da es sowohl zu einer Aufwandersparnis als auch zu einer Kostenersparnis führt. Des Weiteren findet eine Verringerung der benötigten The use of a single hydraulic machine for the parallel control of two axes is advantageous since it leads to both a saving in costs and a saving in costs. Furthermore, there is a reduction in the required
Vorrichtungen statt, was wiederrum zu einer Minimierung von potenziellen Ausfällen und/oder Beschädigungen führt. Devices instead, which in turn minimizes potential failures and / or damage.
Gemäß einer weiteren erfindungsgemäßen Ausführungsform ist das Hydraulikfluid in den Anschlussleitungen vorgespannt. Das Vorspannen kann beispielswiese mittels einer weiteren Hydromaschine, einem Druckspeicher oder Ähnlichem bereitgestellt werden. According to a further embodiment according to the invention, the hydraulic fluid is biased in the connection lines. The prestressing can be provided, for example, by means of a further hydraulic machine, a pressure accumulator or the like.
Die Anschlussleitungen sind dabei die Leitungen, welche das Haupt- bzw. The connecting lines are the lines that the main or
Sekundärventil mit den Anschlüssen der Hydromaschine hydraulisch verbinden. Dabei ist das Vorspannen der Anschlussleitungen vorteilhaft, da somit stets ein gewisser Druck im System herrscht; somit muss nicht kontinuierlich Hydraulikfluid aus einem vollständig entspannten Zustand zu dem erwünschten Zustand aufgespannt werden, was wiederum zu einer substantiellen Energieeinsparung führt. Der Druck in den Anschlussleitungen kann beispielsweise 10 bar betragen. Hauptgrund für die  Hydraulically connect the secondary valve to the connections of the hydraulic machine. Pretensioning of the connecting lines is advantageous since there is always a certain pressure in the system; thus, hydraulic fluid does not have to be continuously expanded from a fully relaxed state to the desired state, which in turn leads to substantial energy savings. The pressure in the connecting lines can be 10 bar, for example. Main reason for that
Vorspannung ist die Gewährleistung eines Mindestdrucks in den beiden Biasing is to ensure a minimum pressure in the two
Aktuatorkammern und damit die Vermeidung von Kavitation auch bei starkem Actuator chambers and thus the avoidance of cavitation even with strong ones
Druckabfall, z.B. bei schnellen Druckwechseln und Bewegungen. Ferner kann gemäß einer weiteren erfindungsgemäßen Ausführungsform die erste Sekundärhydraulikleitung mit einer Ablassleitung und einem Sicherheitsventil und/oder einem 2-Wegeventil, insbesondere einem Ablassventil, hydraulisch verbunden sein. Pressure drop, for example with rapid pressure changes and movements. Furthermore, according to a further embodiment according to the invention, the first secondary hydraulic line can be hydraulically connected to a drain line and a safety valve and / or a 2-way valve, in particular a drain valve.
Durch die Ablassleitung kann der Druck in der Sekundärhydraulikleitung und The pressure in the secondary hydraulic line and
dementsprechend der Druck der ersten Kammer der Sekundärachse und der Druck des Hydrospeicher entspannt werden. accordingly, the pressure of the first chamber of the secondary axis and the pressure of the hydraulic accumulator are relaxed.
Eine solches Ablasssystem, kann entsprechend auch an der Haupthydraulikleitung verwendet und angeordnet werden. Entsprechend können die Ablassleitungen der Haupthydraulikleitung und der Sekundärhydraulikleitung auch gleich sein. Im Sinne der Erfindung ist es auch, dass das in der Ablassleitung entspannte Hydraulikfluid in einen Tank strömt, wo es für weitere Zwecke verwendet werden kann. Der Tank kann dabei der gleiche Tank sein, der zur Einspeisung von Hydraulikfluid ins System dient, wodurch ein geschlossenes System bereitgestellt wird. Ferner, können auch Reinigungs-, Entlüftungs- und/oder Kühlvorrichtungen an der Ablassleitung verbunden sein, so dass beispielsweise das Hydraulikfluid bevor es in das System wieder eingespeist wird, zum Beispiel entlüftet wird. Such a drain system can also be used and arranged accordingly on the main hydraulic line. Accordingly, the drain lines of the main hydraulic line and the secondary hydraulic line can also be the same. It is also within the meaning of the invention that the hydraulic fluid expanded in the discharge line flows into a tank, where it can be used for further purposes. The tank can be the same tank that is used to feed hydraulic fluid into the system, thereby providing a closed system. Furthermore, cleaning, venting and / or cooling devices can also be connected to the drain line, so that, for example, the hydraulic fluid is vented, for example, before it is fed back into the system.
Die Anschlussleitung kann auch so angeordnet sein, dass sie nur zur Entspannung des Hydrospeichers dient, während die erste Kammer der Sekundärachse mittels einer weiteren Leitung, beispielsweise mittels der Anschlussleitung, welche auch mit dem Tank verbunden ist, entspannt wird . Somit kann genau gesteuert werden wo die Druckentspannung erfolgen soll. The connecting line can also be arranged in such a way that it only serves to relax the hydraulic accumulator, while the first chamber of the secondary axis is relaxed by means of a further line, for example by means of the connecting line, which is also connected to the tank. This allows you to control exactly where the pressure relief is to take place.
Es ist auch im Sinne der Erfindung, dass die Hydromaschine zur Entspannung der Kammern der Haupt- und/oder Sekundärachse verwendet werden kann. Beispielsweise kann die Hydromaschine durch einen Schluckstrom eine Hydraulikfluidströmung aus einer der Kammern in den Tank bereitstellen. It is also within the scope of the invention that the hydraulic machine can be used to relax the chambers of the main and / or secondary axis. For example, the hydraulic machine can provide a hydraulic fluid flow from one of the chambers into the tank by means of a swallow flow.
Gemäß einer weiteren erfindungsgemäßen Ausführungsform ist die erste Kammer der Hauptachse und die erste Kammer der Sekundärachse mit der gleichen According to a further embodiment according to the invention, the first chamber of the main axis and the first chamber of the secondary axis are the same
Anschlussleitung der Hydromaschine hydraulisch verbunden. Hydraulic machine connection line hydraulically connected.
Die weitere Anschlussleitung der Hydromaschine kann dabei beispielsweise mit dem Tank hydraulisch verbunden sein, aus welchem das Hydraulikfluid zum Aufspannen des Aktuatorsystems entwendet wird. Nur durch die Einstellung des Haupt- bzw. Sekundärventil ist es somit möglich, einzustellen in welcher der Kammern ein Hydraulikfluidstrom durch die Hydromaschine bereitgestellt wird. Dafür ist es vorteilhaft und eine weitere erfindungsgemäße The further connecting line of the hydraulic machine can, for example, be hydraulically connected to the tank from which the hydraulic fluid is used to clamp the actuator system. Only by setting the main or secondary valve is it possible to set in which of the chambers a hydraulic fluid flow is provided by the hydraulic machine. For this it is advantageous and a further one according to the invention
Ausführungsform, dass das erste Hauptventil und/oder das erste Sekundärventil gesteuerte Ventile sind. Insbesondere ist es vorteilhaft, wenn beide Ventile steuerbar sind, da somit mehr eine verbesserte und genauere Aktuatorsteuerung ermöglicht wird und die Prozessabläufe somit leichter kontrolliert werden können. Das Sekundärventil kann gemäß weiterer erfindungsgemäßen Ausführungsformen auch ein Stetigventil sein, so dass ein lokales Konsta ntd rucksystem durch dem Hydrospeicher und dem Ventil erzeugt wird. Embodiment that the first main valve and / or the first secondary valve are controlled valves. In particular, it is advantageous if both valves can be controlled, since this enables an improved and more precise actuator control and the process sequences can thus be controlled more easily. According to further embodiments according to the invention, the secondary valve can also be a continuous valve, so that a local constant pressure system is generated by the hydraulic accumulator and the valve.
Die Steuerung kann dabei auf beliebige im Stand der Technik bekannten Wege erfolgen, wie beispielsweise mittels elektrisch gesteuerter Ventile. The control can take place in any way known in the prior art, for example by means of electrically controlled valves.
Bei einer weiteren erfindungsgemäßen Ausführungsform weist die Hauptachse mindestens eine zweite Kammer auf, wobei die zweite Kammer mit wenigstens einer zweiten Haupthydraulikleitung und einem zweiten Hauptventil über eine In a further embodiment according to the invention, the main axis has at least one second chamber, the second chamber having at least one second main hydraulic line and one second main valve
Anschlussleitung mit der Hydromaschine hydraulisch verbunden ist. Connection line is hydraulically connected to the hydraulic machine.
In einer weiteren erfindungsgemäßen Ausführungsform des Aktuatorsystems weist auch die Sekundärachse mindestens eine zweite Kammer auf, wobei die zweite Kammer mit wenigstens einer zweiten Sekundärhydraulikleitung und einem zweiten Sekundärventil über eine Anschlussleitung mit der Hydromaschine hydraulisch verbunden ist. In a further embodiment of the actuator system according to the invention, the secondary axis also has at least one second chamber, the second chamber being hydraulically connected to the hydraulic machine with at least one second secondary hydraulic line and a second secondary valve via a connecting line.
Bei den Ausführungsformen, in denen die Achsen mindestens zwei Kammern aufweisen, können die Hauptachse und die Sekundärachse aus einer Gruppe ausgewählt werden, welche beispielsweise Differentialzylinder, Gleichtaktzylinder, Teleskopzylinder und ähnliche Zylinder enthält. Die Wahl der Achsentypologie ist dabei abhängig von der Funktion, welche die Achsen ausüben müssen; beispielsweise kann die Hauptachse ein Differentialzylinder sein, falls die Achse in einer Presse verwendet wird. Die Hauptachse und Sekundärachse müssen nicht unbedingt als gleicher Zylindertyp ausgebildet sein. In the embodiments in which the axes have at least two chambers, the main axis and the secondary axis can be selected from a group which contains, for example, differential cylinders, common-mode cylinders, telescopic cylinders and similar cylinders. The choice of axis typology depends on the function that the axes must perform; for example, the main axis can be a differential cylinder if the axis is used in a press. The main axis and secondary axis do not necessarily have to be designed as the same cylinder type.
Falls sowohl die Hauptachse und die Sekundärachse jeweils eine zweite Kammer aufweisen, dann sind, gemäß einer weiteren erfindungsgemäßen Ausführungsform, die zweite Kammer der Hauptachse und die zweite Kammer der Sekundärachse mit der gleichen Anschlussleitung der Hydromaschine hydraulisch verbunden, wobei die If both the main axis and the secondary axis each have a second chamber, then, according to a further embodiment according to the invention, the second chamber of the main axis and the second chamber of the secondary axis are hydraulically connected to the same connecting line of the hydraulic machine, the
Anschlussleitung verschieden ist zu der Anschlussleitung, mit welcher die erste Kammer der Haupt- und Sekundärachse hydraulisch verbunden ist. Es ist vorteilhaft, wenn die jeweiligen zweiten Kammern der Achsen an derselben Leitung verbunden sind, da somit weniger Leitungen verwendet werden und das System vereinfacht betrieben werden kann. Connection line is different from the connection line with which the first chamber of the main and secondary axes is hydraulically connected. It is advantageous if the respective second chambers of the axes are connected on the same line, since fewer lines are thus used and the system can be operated in a simplified manner.
Gemäß einer weiteren erfindungsgemäßen Ausführungsform sind das zweite According to a further embodiment according to the invention, the second
Hauptventil und/oder das zweite Sekundärventil gesteuerte Ventile. Main valve and / or the second secondary valve controlled valves.
Wie schon für das erste Hauptventil und das erste Sekundärventil, bietet die As for the first main valve and the first secondary valve, the
Steuerbarkeit der zweiten Haupt- und/oder Sekundärventile eine verbesserte Controllability of the second main and / or secondary valves an improved
Steuerung des gesamten Systems, wodurch sich die Effizienz des Systems verbessert und somit energie- und kostensparender betrieben werden kann. Control of the entire system, which improves the efficiency of the system and can thus be operated in an energy and cost-saving manner.
Gemäß einer weiteren erfindungsgemäßen Ausführungsform des Aktuatorsystem ist mindestens eines der gesteuerten Ventile mittels eines Steuerungsventil entsperrbar. According to a further embodiment of the actuator system according to the invention, at least one of the controlled valves can be unlocked by means of a control valve.
Gemäß einer noch weiteren erfindungsgemäßen Ausführungsform des Aktuatorsystems ist wenigstens eines der Steuerungsventile mittels Rückschlagventile an mindestens einer der Anschlussleitungen der Hydromaschine hydraulisch verbunden. According to yet another embodiment of the actuator system according to the invention, at least one of the control valves is hydraulically connected to at least one of the connecting lines of the hydraulic machine by means of check valves.
Das heißt, dass die Kreisläufe der Steuerungsventile für die Haupt- und/oder This means that the circuits of the control valves for the main and / or
Sekundärventile an den Anschlussleitungen der Hydromaschine hydraulisch verbunden sind. Somit fließt Hydraulikfluid, welches im System ist, auch durch die Kreisläufe der Steuerungsventile, wodurch kein zusätzliches Aufspannen und insbesondere kein zusätzlicher unabhängiger Steuerungskreislauf benötigt wird. Secondary valves on the connecting lines of the hydraulic machine are hydraulically connected. Hydraulic fluid which is in the system thus also flows through the circuits of the control valves, as a result of which no additional clamping and in particular no additional independent control circuit is required.
Weiterhin wird ein Verfahren zum Betreiben des erfindungsgemäßen Furthermore, a method for operating the invention
elektrohydrostatischen Aktuatorsystem gemäß einer der beschriebenen electrohydrostatic actuator system according to one of the described
Ausführungsformen beansprucht. Gemäß einem solchen erfindungsgemäßen Verfahren werden die Hauptachse und die Sekundärachse parallel oder sequentiell durch die gleiche Hydromaschine betrieben.Embodiments claimed. According to such a method according to the invention, the main axis and the secondary axis are operated in parallel or sequentially by the same hydraulic machine.
Dies ist eines gegenüber den in dem Stand der Technik bekannten Verfahren vorteilhaftes Verfahren, da insbesondere das parallele Betreiben der Achsen mittels einer einzigen Hydromaschine mehrere schon erwähnte Vorteile mit sich bringt.  This is a method which is advantageous compared to the methods known in the prior art, since in particular the parallel operation of the axes by means of a single hydraulic machine brings with it several advantages which have already been mentioned.
Das parallele betreiben der Achsen besteht im Allgemeinen aus mehreren Schritten. Als erstes wird die Sekundärachse mittels der Hydromaschine aufgespannt, wobei durch das Aufspannen der ersten Kammer der Sekundärachse auch der Hydrospeicher bzw. das Hydraulikfluid im Hydrospeicher aufgespannt wird. Bei ausreichendem Druck in der ersten Kammer der Sekundärachse wird mittels des Sekundärventils die Verbindung zur Hydromaschine unterbrochen. Da der aufgespannte Hydrospeicher mit der Kammer der Sekundärachse verbunden ist, bleibt die The parallel operation of the axes generally consists of several steps. First, the secondary axis is clamped by means of the hydraulic machine, the hydraulic accumulator or hydraulic fluid in the hydraulic accumulator also being clamped by clamping the first chamber of the secondary axis. If there is sufficient pressure in the first chamber of the secondary axis, the connection to the hydraulic machine is interrupted by means of the secondary valve. Since the clamped hydraulic accumulator is connected to the chamber of the secondary axis, the remains
Sekundärachse aufgespannt. Dementsprechend wird die Hydromaschine zur Secondary axis spanned. Accordingly, the hydromachine becomes
Bereitstellung eines Hydraulikfluidstromes in die Primärachse verwendet. Nach dem Ablauf werden die Achsen entspannt. Providing a hydraulic fluid flow used in the primary axis. After the run, the axes are relaxed.
Nicht zuletzt wird auch die Verwendung eines erfindungsgemäßen Aktuatorsystems mittels eines der oben beschriebenen Verfahrens beansprucht. Dabei kann das System zur Umformung von Formteilen, zum Tiefziehen von Formteilen oder durch andere ähnliche Verfahren bei denen ein elektrohydrostatisches Aktuatorsystems benötigt wird, verwendet werden. Last but not least, the use of an actuator system according to the invention is also claimed by means of one of the methods described above. The system can be used for forming molded parts, for deep-drawing molded parts or by other similar processes in which an electrohydrostatic actuator system is required.
Die Erfindung wird nachfolgend anhand verschiedener Ausführungsbeispiele erläutert, wobei darauf hingewiesen wird, dass durch diese Beispiele Abwandlungen  The invention is explained below on the basis of various exemplary embodiments, it being pointed out that these examples make modifications
beziehungsweise Ergänzungen, wie sie sich für den Fachmann unmittelbar ergeben, mit umfasst sind. or additions as they immediately arise for the expert are included.
Dabei zeigen: Show:
Fig. 1: eine schematische allgemeine Darstellung eines erfindungsgemäßen Systems; 1: a schematic general representation of a system according to the invention;
Fig. 2 eine schematische Darstellung einer beispielhaften Ausführungsform des Fig. 2 is a schematic representation of an exemplary embodiment of the
erfindungsgemäßen Systems gemäß der Figur 1;  system according to the invention according to FIG. 1;
Fig. 2: eine schematische Darstellung einer beispielhaften Ausführungsform des 2: a schematic representation of an exemplary embodiment of the
erfindungsgemäßen Systems gemäß der Figur 2;  system according to the invention according to FIG. 2;
Fig. 4: eine schematische Darstellung einer weiteren beispielhaften Ausführungsform des erfindungsgemäßen Systems gemäß der Figur 1; 4 shows a schematic illustration of a further exemplary embodiment of the system according to the invention according to FIG. 1;
Fig. 5: eine schematische Darstellung einer weiteren beispielhaften Ausführungsform, wobei die Sekundärachse vorgespannt ist; 5 shows a schematic illustration of a further exemplary embodiment, the secondary axis being pretensioned;
Fig. 6: eine schematische Darstellung einer weiteren beispielhaften Ausführungsform des erfindungsgemäßen Systems gemäß der Figur 5; 6: a schematic representation of a further exemplary embodiment of the system according to the invention according to FIG. 5;
Figur 1 zeigt eine allgemeine Anordnung einer beispielhaften erfindungsgemäßen Ausführungsform des Aktuatorsystems 1 mit zwei beweglichen Achsen. Die beispielhafte erfindungsgemäße Ausführungsform des Aktuatorsystems 1 weist eine von einem Elektromotor 10 angetriebene volumen- und/oder drehzahl-variable FIG. 1 shows a general arrangement of an exemplary embodiment of the actuator system 1 according to the invention with two movable axes. The exemplary embodiment of the actuator system 1 according to the invention has a volume and / or speed variable driven by an electric motor 10
Hydromaschine 11, zur Bereitstellung eines Volumenstroms eines Hydraulikfluids. Hydraulic machine 11, for providing a volume flow of a hydraulic fluid.
Das System 1 weist weiterhin eine Hauptachse 20 auf, welche als Differentialzylinder mit einer ersten Kammer 22 und einer zweiten Kammer 24 ausgestaltet ist, wobei die erste Kammer 22 durch eine erste Haupthydraulikleitung 52 und durch eine erste Anschlussleitung 12 und die zweite Kammer 24 durch eine zweite Haupthydraulikleitung 54 und durch eine zweite Anschlussleitung 14 mit jeweils einem Anschluss der The system 1 also has a main axle 20, which is designed as a differential cylinder with a first chamber 22 and a second chamber 24, the first chamber 22 through a first main hydraulic line 52 and through a first connection line 12 and the second chamber 24 through a second Main hydraulic line 54 and through a second connection line 14, each with a connection of the
Hydromaschine 11 hydraulisch verbunden sind. Hydraulic machine 11 are hydraulically connected.
Zwischen der Hydromaschine und der ersten bzw. der zweiten Kammer 22, 24 der Hauptachse 20 sind jeweils ein erstes und ein zweites Hauptventil 23 und 25 A first and a second main valve 23 and 25 are located between the hydraulic machine and the first and the second chamber 22, 24 of the main axis 20
angeordnet. Diese sind in der Figur 1 als gesteuerte 2/2 Wegeventil mit einer arranged. These are shown in Figure 1 as a controlled 2/2 way valve with a
Durchfluss- und einer Sperrsteilung dargestellt. Flow and a barrier division shown.
Weiterhin, wie in Figur 1 ersichtlich, weist die beispielhafte erfindungsgemäße Furthermore, as can be seen in FIG. 1, the example according to the invention
Ausführungsform des Aktuatorsystems 1 eine Sekundärachse 30 auf, welche ebenfalls eine erste Kammer 32 und eine zweite Kammer 34 aufweist, wobei die erste Kammer 32 durch eine erste Sekundärhydraulikleitung 62 und durch die erste Anschlussleitung 12 und die zweite Kammer 34 durch eine zweite Sekundärhydraulikleitung 64 und durch die zweite Anschlussleitung 14, mit jeweils einem Anschluss der Hydromaschine 11 hydraulisch verbunden ist. Embodiment of the actuator system 1 on a secondary axis 30, which also has a first chamber 32 and a second chamber 34, the first chamber 32 through a first secondary hydraulic line 62 and through the first connection line 12 and the second chamber 34 through a second secondary hydraulic line 64 and through the second connection line 14 is hydraulically connected to a connection of the hydraulic machine 11.
Gemäß der vorliegenden erfindungsgemäßen beispielhaften Ausführungsform ist eine Ventilanordnung 90 und ein Hydrospeicher 40 mit der Sekundärachse 30 hydraulisch verbunden. Einige Ausführungsformen, wie die Ventilanordnung 90 ausgestaltet ist, werden in den nächsten Figuren erläutert. According to the exemplary embodiment according to the present invention, a valve arrangement 90 and a hydraulic accumulator 40 are hydraulically connected to the secondary axis 30. Some embodiments of how the valve arrangement 90 is designed are explained in the next figures.
Im Allgemeinen soll die Anordnung so erfolgen, dass es möglich ist mittels einer einzigen Hydromaschine 11 sowohl die Hauptachse 20 als auch die Sekundärachse 30 sequentiell und/oder Parallel zu bedienen. Es ist beispielsweise wichtig, dass mittels der Ventilanordnung 90 eine Hydraulikfluidströmung von der ersten und/oder zweiten Kammern 32, 34 der Sekundärachse 30 in Richtung von oder zu der Hydromaschine 11 nach Belieben gesperrt werden kann, so dass die Hydromaschine 11 hauptsächlich auf die Hauptachse 20 einwirkt. Ferner sollte die Ventilanordnung 90 so ausgestaltet sein, dass ein Entspannen der ersten und/oder zweiten Kammer 32, 34 der Sekundärachse 30 ermöglicht wird. In general, the arrangement should be such that it is possible to operate both the main axis 20 and the secondary axis 30 sequentially and / or in parallel by means of a single hydraulic machine 11. It is important, for example, that the valve arrangement 90 can be used to block a hydraulic fluid flow from the first and / or second chambers 32, 34 of the secondary axis 30 in the direction of or to the hydraulic machine 11 as desired, so that the hydraulic machine 11 mainly points to the main axis 20 acts. Furthermore, the valve arrangement 90 should be designed in such a way that the first and / or second chambers 32, 34 of the secondary axis 30 can be relaxed.
_ g _ Des weiterem weist das System 1 eine Quelle 80 und eine Vorspannquelle 82 auf, welche zur Vorspannung der Anschlussleitungen 12 und 14 der Hydromaschine 11 dienen. Die Hydromaschine 11 ist weiterhin mit einem Tank 84 hydraulisch verbunden, aus welchem die Hydromaschine 11 Hydraulikfluid entnimmt und in das System speist. _ g _ Furthermore, the system 1 has a source 80 and a biasing source 82, which serve to bias the connecting lines 12 and 14 of the hydraulic machine 11. The hydraulic machine 11 is also hydraulically connected to a tank 84, from which the hydraulic machine 11 takes hydraulic fluid and feeds it into the system.
In dieser erfindungsgemäßen beispielshaften Ausführungsform strömt bei der In this exemplary embodiment according to the invention flows at the
Entspannung einer der beiden ersten Kammern 22 bzw. 32 der Primär- bzw. Relaxation of one of the two first chambers 22 or 32 of the primary or
Sekundärachse 20, 30 das Hydraulikfluid in die Vorspannquelle 82 oder den Tank 84. Dies kann beispielsweise mittels der Hydromaschine 11 erfolgen und/oder, wie in der Figur 1 dargestellt, durch eine zusätzliche Leitung 98a, welche durch ein entsperrbares Ventil 92, in diesem Fall ein entsperrbares Rückschlagventil, mit dem Tank 84 oder der Vorspannquelle 82 verbunden ist. Secondary axis 20, 30, the hydraulic fluid into the biasing source 82 or the tank 84. This can be done, for example, by means of the hydraulic machine 11 and / or, as shown in FIG. 1, by an additional line 98a, which in this case by an unlockable valve 92 an unlockable check valve connected to tank 84 or bias source 82.
Eine weitere Leitung 98b mit einem weiteren entsperrbaren Ventil 94 dient sowohl zur hydraulischen Verbindung der Quelle 80 und der Vorspannquelle 82 mit der Another line 98b with a further unlockable valve 94 serves both for the hydraulic connection of the source 80 and the biasing source 82 with the
Hydromaschine 11 als auch zur Entspannung der zweiten Kammer 24, 34 der Haupt- und/oder Sekundärachse 20, 30. Hydraulic machine 11 as well as to relax the second chamber 24, 34 of the main and / or secondary axis 20, 30.
Alternativ oder zusätzlich kann eine Ablassleitung 42 mit einem entsperrbaren Ventil 43 an dem Anschluss des Hydrospeicher und mit dem Tank 84 hydraulisch verbunden sein. Gemäß weitere beispielhafter erfindungsgemäßen Ausführungsformen kann der Alternatively or additionally, a drain line 42 can be hydraulically connected to an unlockable valve 43 at the connection of the hydraulic accumulator and to the tank 84. According to further exemplary embodiments according to the invention, the
Hydrospeicher 40 mittels der zusätzlichen Leitung 42 und dem entsperrbaren Ventil 43 entspannt werden. Hydraulic accumulator 40 can be relaxed by means of the additional line 42 and the unlockable valve 43.
Figur 2 zeigt eine beispielhafte Ausführungsform des erfindungsgemäßen Systems aus Figur. 1. Dabei ist der allgemeine Aufbau des Systems 1 unverändert. FIG. 2 shows an exemplary embodiment of the system according to the invention from FIG. 1. The general structure of system 1 is unchanged.
Unterschiedlich ist die Anordnung der Ventile an der Sekundärachse 30. Insbesondere, wie in Figur 2 ersichtlich ist die Sekundärachse 30 als Differentialzylinder dargestellt, wobei auch die Anordnung eines Gleichgangzylinders vorstellbar ist. Die Sekundärachse 30 weist dabei eine erste Kammer 32 auf und ein durch die erste The arrangement of the valves on the secondary axis 30 differs. In particular, as can be seen in FIG. 2, the secondary axis 30 is shown as a differential cylinder, the arrangement of a synchronous cylinder also being conceivable. The secondary axis 30 has a first chamber 32 and one through the first
Sekundärhydraulikleitung 62 mit der ersten Kammer 32 verbundenen Hydrospeicher 40, und eine zweite Kammer 34 auf. Secondary hydraulic line 62 with the first chamber 32 connected hydraulic accumulator 40, and a second chamber 34.
Die Ventilanordnung 90 umfasst dabei ein Sekundärventil 33, wobei die erste Kammer 32 und die zweite Kammer 34 der Sekundärachse durch die erste The valve arrangement 90 comprises a secondary valve 33, the first chamber 32 and the second chamber 34 of the secondary axis through the first
Sekundärhydraulikleitung 62 bzw. der zweiten Sekundärhydraulikleitung 64, durch das gemeinsame Sekundärventil 33 mit der Hydromaschine hydraulisch verbunden sind. In der beispielhaften erfindungsgemäßen Ausführungsform gemäß Figur 2 ist das erste Sekundärventil 33 ein 4/2 Wegeventil 33 mit einer Durchflussstellung und einer Sperrstellung, so dass sowohl die erste Sekundärhydraulikleitung 62 als auch die zweite Sekundärhydraulikleitungen 64 entweder gleichzeitig offen oder gleichzeitig gesperrt sind. Im ersten Fall, kann die Hydromaschine 11 direkt in den beiden Kammern 32, 34 der Sekundärachse 30 sowie in den Hydrospeicher 40 arbeiten. Beispielsweise kann die Hydromaschine 11 ein Hydraulikfluidstrom in die erste Kammer 32 der Sekundärachse 30 und in den Hydraulikspeicher 40 bereitstellen, so dass die Sekundärachse 30 aufgespannt wird, während Hydraulikfluid aus der zweiten Kammer 34 entzogen wird. Secondary hydraulic line 62 or the second secondary hydraulic line 64, through which common secondary valve 33 are hydraulically connected to the hydraulic machine. In the exemplary embodiment according to the invention according to FIG. 2, the first secondary valve 33 is a 4/2-way valve 33 with a flow position and a blocking position, so that both the first secondary hydraulic line 62 and the second secondary hydraulic lines 64 are either open simultaneously or blocked simultaneously. In the first case, the hydraulic machine 11 can work directly in the two chambers 32, 34 of the secondary axis 30 and in the hydraulic accumulator 40. For example, the hydraulic machine 11 can provide a hydraulic fluid flow into the first chamber 32 of the secondary axis 30 and into the hydraulic accumulator 40, so that the secondary axis 30 is clamped while hydraulic fluid is withdrawn from the second chamber 34.
Im zweiten Fall, also wenn das Sekundärventil 33 in die Sperrsteilung gebracht wird, wird die hydraulische Verbindung der Sekundärachse 30 zur Hydromaschine 11 durch das Ventil 33 unterbrochen, wobei die Sekundärachse 30 durch den Hydrospeicher 40 in einem aufgespannten Zustand verbleibt. Die Hydromaschine 11 kann In the second case, that is to say when the secondary valve 33 is brought into the blocking division, the hydraulic connection of the secondary axis 30 to the hydraulic machine 11 is interrupted by the valve 33, the secondary axis 30 remaining in a clamped state by the hydraulic accumulator 40. The hydraulic machine 11 can
dementsprechend in diesem Fall in die Primärachse 20 einwirken, während die accordingly in this case act in the primary axis 20 while the
Sekundärachse in einem aufgespannten Zustand bleibt. Secondary axis remains in a clamped state.
Falls eine Entspannung der ersten und/oder zweiten Kammer der Sekundärachse 30 beabsichtig wird, kann das Sekundärventil 33 auf Durchfluss gestellt werden und die Ventile 92 und/oder 94 entsperrt werden, so dass Hydraulikfluid in die Vorspannquelle 82 strömen kann. If relaxation of the first and / or second chamber of the secondary axis 30 is intended, the secondary valve 33 can be set to flow and the valves 92 and / or 94 can be unlocked so that hydraulic fluid can flow into the preload source 82.
Wie auch schon in der beispielhaften Ausführungsform der Figur 1, kann der As in the exemplary embodiment in FIG. 1, the
Hydrospeicher 40 mittels eines Ventils 43 und einer Ablassleitung 42 direkt in den Tank 84 entlastet werden. Hydraulic accumulator 40 can be relieved directly into the tank 84 by means of a valve 43 and a drain line 42.
Figur 3 zeigt eine ähnliche beispielhafte erfindungsgemäße Ausführungsform des Aktuatorsystems wie Figur 2, wobei die Ventilanordnung 90 anstatt eines einzelnen Sekundärventil ein erstes Sekundärventil 33, welches an die erste Figure 3 shows a similar exemplary embodiment of the actuator system according to the invention as Figure 2, wherein the valve assembly 90 instead of a single secondary valve, a first secondary valve 33 which is connected to the first
Sekundärhydraulikleitung 62 angeordnet ist und ein zweites Sekundärventil 35, welches an die zweite Sekundärhydraulikleitung 64 angeordnet ist, umfasst. Secondary hydraulic line 62 is arranged and comprises a second secondary valve 35, which is arranged on the second secondary hydraulic line 64.
In dieser beispielhaften erfindungsgemäßen Ausführungsform sind sowohl das erste als auch das zweite Sekundärventil 33, 35 gesteuerte 2/2-Wegeventile mit jeweils einer Durchfluss- und einer Sperrsteilung. Somit kann die Beaufschlagung und die In this exemplary embodiment according to the invention, both the first and the second secondary valve 33, 35 are controlled 2/2-way valves, each with a flow and a blocking division. Thus, the loading and the
Entspannung der ersten und/oder der zweiten Kammer 32, 34 der Sekundärachse einzeln gesteuert werden. Figur 4 zeigt eine beispielhafte alternative Ausführungsform des erfindungsgemäßen Systems 1 gemäß einer der vorherigen Figuren. Relaxation of the first and / or the second chamber 32, 34 of the secondary axis can be controlled individually. FIG. 4 shows an exemplary alternative embodiment of the system 1 according to the invention according to one of the previous figures.
In dieser beispielhaften erfindungsgemäßen Ausführungsform des Aktuatorsystem 1 umfasst die Ventilanordnung 90 ein 4/3-Wegeventil 33 mit einer Durchfluss-, In this exemplary embodiment of the actuator system 1 according to the invention, the valve arrangement 90 comprises a 4/3-way valve 33 with a throughflow,
Kreuzdurchfluss- und Sperrsteilung, welches sowohl an der ersten Cross flow and barrier division, which both at the first
Sekundärhydraulikleitung 62 als auch an der zweiten Sekundärhydraulikleitung 64 angeordnet ist und ein 2/2-Wegeventil 35 mit einer Durchfluss- und Sperrstellung, welches auf einer Leitung angeordnet ist, die den Hydrospeicher 40 und die Secondary hydraulic line 62 and the second secondary hydraulic line 64 is arranged and a 2/2-way valve 35 with a flow and blocking position, which is arranged on a line that the hydraulic accumulator 40 and
Sekundärachse 30 mit der Anschlussleitung 12 verbindet. Connects secondary axis 30 to the connecting line 12.
Insbesondere ist eine Ablassleitung 94 an dem 4/3-Wegeventil 33 angeschlossen, so dass bei den jeweiligen Durchflussstellungen entweder die erste Kammer 32 oder die zweite Kammer 34 der Sekundärachse 30 mit der Ablassleitung 94 verbunden ist. Ferner ist die Ablassleitung 94 mit dem Tank 84 hydraulisch verbunden, so dass das beim Entspannen des Hydraulikfluids aus einer der zwei Kammern 32, 34, dieser direkt in den Tank 84 strömen kann. In particular, a drain line 94 is connected to the 4/3-way valve 33, so that either the first chamber 32 or the second chamber 34 of the secondary axis 30 is connected to the drain line 94 at the respective flow positions. Furthermore, the drain line 94 is hydraulically connected to the tank 84, so that when the hydraulic fluid is released from one of the two chambers 32, 34, it can flow directly into the tank 84.
Das zweite Sekundärventil 35 sperrt die Verbindung der Sekundärachse 30 und den Hydrospeicher 40 mit der Anschlussleitung 12 und entsprechend mit dem restlichen System 1. The second secondary valve 35 blocks the connection of the secondary axis 30 and the hydraulic accumulator 40 to the connecting line 12 and accordingly to the rest of the system 1.
Der Hydrospeicher 40 kann beispielsweise mittels des zweiten Sekundärventils 35, durch die Leitung 12, 98a und durch Entsperren des Ventils 92 entspannt werden oder, wie in den vorherigen Figuren gezeigt, durch eine alternative Leitung 42. The hydraulic accumulator 40 can be expanded, for example, by means of the second secondary valve 35, through the line 12, 98a and by unlocking the valve 92 or, as shown in the previous figures, by an alternative line 42.
Wie in Figur 5 gezeigt, kann gemäß einer weiteren beispielhaften Ausführungsform die Sekundärachse 30 anstatt eines Differentialzylinders auch ein vorgespannter Zylinder sein. As shown in FIG. 5, according to a further exemplary embodiment, the secondary axis 30 can also be a preloaded cylinder instead of a differential cylinder.
Das Vorspannen des Zylinders kann mittels einer Feder oder auch mittels eines Gewichtssystems erfolgen, wobei der Zylinder mindestens eine Entlüftungsvorrichtung an seiner vorgespannten Kammer 34 aufweist, damit beim Pressablauf, die Luft entkommen kann. The cylinder can be pretensioned by means of a spring or also by means of a weight system, the cylinder having at least one ventilation device on its pretensioned chamber 34, so that the air can escape during the pressing process.
Die Ventilanordnung 90 umfasst in dieser beispielshaften erfindungsgemäßen The valve arrangement 90 in this example comprises according to the invention
Ausführungsform ein 2-Wegeventil 33 mit einer Durchfluss- und einer Sperrstellung; dabei ist die erste Kammer 32 der Sekundärachse 30 durch die erste Hydraulikleitung 62 und dem Sekundärventil 33 mit der Anschlussleitung 12, bzw. mit der Hydromaschine 11 hydraulisch verbunden. Embodiment a 2-way valve 33 with a flow and a blocking position; the first chamber 32 of the secondary axis 30 through the first hydraulic line 62 and the secondary valve 33 with the connecting line 12, or with the hydraulic machine 11 hydraulically connected.
Weiterhin ist auch der Druckspeicher 40 sowohl zu der Sekundärhydraulikleitung 62 als auch mit dem Sekundärventil 33 hydraulisch verbunden. Zum Entspannen der ersten Kammer 32 und des Hydrospeichers 40, können beispielsweise das Sekundärventil 33 und das gesteuerte Ventil 92 entsperrt werden, so dass das entspannte Hydraulikfluid in die Vorspannquelle 82 strömt. Alternativ kann der Hydrospeicher 40 auch in dieser beispielhaften erfindungsgemäßen Ausführungsform durch eine Ablassleitung 42 mit einem Ablassventil 43 an dem Tank 84 hydraulisch verbunden sein. Es ist in dieser Ausführungsform jedoch nur möglich die erste Kammer 32 zeitgleich mit dem Furthermore, the pressure accumulator 40 is also hydraulically connected both to the secondary hydraulic line 62 and to the secondary valve 33. To relax the first chamber 32 and the hydraulic accumulator 40, the secondary valve 33 and the controlled valve 92 can be unlocked, for example, so that the relaxed hydraulic fluid flows into the preload source 82. Alternatively, in this exemplary embodiment according to the invention, the hydraulic accumulator 40 can also be hydraulically connected to a drain valve 43 on the tank 84 by a drain line 42. In this embodiment, however, the first chamber 32 is only possible at the same time as the
Hydrospeicher 40 zu entspannen. Hydraulic accumulator 40 to relax.
In der beispielhaften erfindungsgemäßen Ausführungsform, die in Figur 6 gezeigt wird, kann hingegen mittels der ausgewählten Ventilanordnung 90 die erste Kammer 32 der Sekundärachse 30 und der Hydrospeicher 40 jeweils einzeln oder zusammen entspannt werden. In the exemplary embodiment according to the invention, which is shown in FIG. 6, on the other hand, the selected valve arrangement 90 can be used to relax the first chamber 32 of the secondary axis 30 and the hydraulic accumulator 40 individually or together.
Dabei umfasst die Ventilanordnung 90 ein mit der Sekundärhydraulikleitung The valve assembly 90 includes one with the secondary hydraulic line
verbundenes 3-Wegeventil, mit einer Durchfluss-, einer Kreuzfluss- und einer connected 3-way valve, with one flow, one cross flow and one
Sperrsteilung. Ferner umfasst die Ventilanordnung ein zweites Sekundärventil 35, welches, wie im vorherigen Beispiel als ein 2-Wegeventil, die Anschlussleitung 12 mit der Sekundärachse 30 und/oder dem Hydrospeicher 40 verbindet, ausgestaltet ist. Blocking division. Furthermore, the valve arrangement comprises a second secondary valve 35 which, as in the previous example as a 2-way valve, connects the connection line 12 to the secondary axis 30 and / or the hydraulic accumulator 40.
Ist das zweite Sekundärventil 35 gesperrt und ist das erste Sekundärventil 33 auf Kreuzflussstellung geschaltet, dann wird eine Verbindung zwischen der ersten Kammer der Sekundärachse und dem Tank 84 mittels einer Leitung 94 hergestellt. Auch hier kann der Hydrospeicher 40 durch eine Ablassleitung 42 mit einem Ablassventil 43 mit dem Tank 84 hydraulisch verbunden sein; somit kann durch die Sperrung des ersten Sekundärventils 33 und Öffnen des Ablassventils 43 ein alleiniges Entspannen des Hydrospeichers 40 erreicht werden. Bezugszeichenliste ktuatorsystem 35 zweites Sekundärventil If the second secondary valve 35 is blocked and the first secondary valve 33 is switched to the cross flow position, then a connection is established between the first chamber of the secondary axis and the tank 84 by means of a line 94. Here, too, the hydraulic accumulator 40 can be hydraulically connected to the tank 84 through a drain line 42 with a drain valve 43; Thus, by blocking the first secondary valve 33 and opening the drain valve 43, the hydraulic accumulator 40 can be relaxed only. Reference numeral ktuatorsystem 35 second secondary valve
Elektromotor 40 Hydrospeicher Electric motor 40 hydraulic accumulators
Hydromaschine 42 Ablassleitung Hydromachine 42 drain pipe
erste Anschlussleitung 43 2-Wegeablassventil first connection line 43 2-way drain valve
zweite Anschlussleitung 52 erste Haupthydraulikleitung Hauptachse 54 zweite Haupthydraulikleitung erste Kammer der Hauptachse 62 erste Sekundärhydraulikleitung erstes Hauptventil 64 zweite Sekundärhydraulikleitung zweite Kammer der Hauptachse 80 Quelle second connecting line 52 first main hydraulic line main axis 54 second main hydraulic line first chamber of the main axis 62 first secondary hydraulic line first main valve 64 second secondary hydraulic line second chamber of the main axis 80 source
zweites Hauptventil 82 Vorspannquelle second main valve 82 biasing source
Sekundärachse 84 Tank Secondary axis 84 tank
erste Kammer der Sekundärachse 90 Ventilanordnung first chamber of secondary axis 90 valve assembly
erstes Sekundärventil 94 Ablassleitung first secondary valve 94 drain line
zweite Kammer der Sekundärachse 98a, 98b Ablassleitungen second chamber of the secondary axis 98a, 98b drain lines

Claims

Patentansprüche Claims
1. Elektrohydrostatisches Aktuatorsystem (1) mit wenigstens zwei beweglichen 1. Electrohydrostatic actuator system (1) with at least two movable
Achsen umfassend:  Comprehensive axes:
eine von einem Elektromotor (10) angetriebene volumen- und/oder  a volume and / or driven by an electric motor (10)
drehzahl-variable Hydromaschine (11) mit zwei Anschlussleitungen zur  Speed-variable hydraulic machine (11) with two connection lines for
Bereitstellung eines Volumenstroms eines Hydraulikfluids;  Provision of a volume flow of a hydraulic fluid;
eine durch das Hydraulikfluid bewegbare Hauptachse (20) mit mindestens einer ersten Kammer (22), wobei die erste Kammer (22) mit wenigstens einer ersten Haupthydraulikleitung (52) und einem ersten Hauptventil (23) über eine  a main axis (20) movable by the hydraulic fluid with at least a first chamber (22), the first chamber (22) with at least a first main hydraulic line (52) and a first main valve (23) via a
Anschlussleitung mit der Hydromaschine (11) hydraulisch verbunden ist;  Connection line is hydraulically connected to the hydraulic machine (11);
eine durch das Hydraulikfluid bewegbare Sekundärachse (30) mit mindestens einer ersten Kammer (32), wobei die erste Kammer (32) mit wenigstens einer ersten Sekundärhydraulikleitung (62) und einem ersten Sekundärventil (33) über eine Anschlussleitung mit der Hydromaschine (11) hydraulisch verbunden ist;  a secondary axis (30) which can be moved by the hydraulic fluid and has at least one first chamber (32), the first chamber (32) with at least one first secondary hydraulic line (62) and a first secondary valve (33) being hydraulically connected to the hydraulic machine (11) via a connecting line connected is;
dadurch gekennzeichnet, dass  characterized in that
ein Hydrospeicher (40) mit der ersten Sekundärhydraulikleitung (62) im Bereich zwischen der ersten Kammer (32) der Sekundärachse (30) und dem ersten  a hydraulic accumulator (40) with the first secondary hydraulic line (62) in the area between the first chamber (32) of the secondary axis (30) and the first
Sekundärventil (33) hydraulisch verbunden ist.  Secondary valve (33) is hydraulically connected.
2. Elektrohydrostatisches Aktuatorsystem (1) nach Anspruch 1 dadurch  2. Electrohydrostatic actuator system (1) according to claim 1 thereby
gekennzeichnet, dass das Hydraulikfluid in den Anschlussleitungen vorgespannt ist.  characterized in that the hydraulic fluid is biased in the connecting lines.
3. Elektrohydrostatisches Aktuatorsystem (1) nach einem der vorherigen Ansprüche dadurch gekennzeichnet, dass ein weiterer Hydrospeicher mit der ersten Haupthydraulikleitung (52) im Bereich zwischen der ersten Kammer (22) der Hauptachse (20) und dem ersten Hauptventil (23) hydraulisch verbunden ist.  3. Electrohydrostatic actuator system (1) according to one of the preceding claims, characterized in that a further hydraulic accumulator is hydraulically connected to the first main hydraulic line (52) in the region between the first chamber (22) of the main axis (20) and the first main valve (23) .
4. Elektrohydrostatisches Aktuatorsystem (1) nach einem der vorherigen Ansprüche dadurch gekennzeichnet, dass die erste Sekundärhydraulikleitung (62) und/oder die erste Haupthydraulikleitung (52) mit einer Ablassleitung (94) und einem  4. Electrohydrostatic actuator system (1) according to one of the preceding claims, characterized in that the first secondary hydraulic line (62) and / or the first main hydraulic line (52) with a drain line (94) and one
Sicherheitsventil und/oder einem 2-Wegeventil, insbesondere einem Ablassventil, hydraulisch verbunden sind.  Safety valve and / or a 2-way valve, in particular a drain valve, are hydraulically connected.
5. Elektrohyd rostatisches Aktuatorsystem (1) nach einem der vorherigen Ansprüche dadurch gekennzeichnet, dass die erste Kammer (23) der Hauptachse (20) und die erste Kammer (32) der Sekundärachse (30) mit der gleichen Anschlussleitung der Hydromaschine (11) hydraulisch verbunden sind. 5. Electrohydrostatic actuator system (1) according to one of the preceding claims, characterized in that the first chamber (23) of the main axis (20) and the first chamber (32) of the secondary axis (30) is hydraulically connected to the same connecting line of the hydraulic machine (11).
6. Elektrohydrostatisches Aktuatorsystem (1) nach einem der vorherigen Ansprüche dadurch gekennzeichnet, dass das erste Hauptventil (23) und/oder das erste Sekundärventil (33) gesteuerte Ventile sind.  6. Electrohydrostatic actuator system (1) according to one of the preceding claims, characterized in that the first main valve (23) and / or the first secondary valve (33) are controlled valves.
7. Elektrohydrostatisches Aktuatorsystem (1) nach einem der vorherigen Ansprüche dadurch gekennzeichnet, dass die Hauptachse und/oder die Sekundärachse mechanisch, und insbesondere mit einem Federsystem oder einem Gewichtssystem vorgespannt ist.  7. Electrohydrostatic actuator system (1) according to one of the preceding claims, characterized in that the main axis and / or the secondary axis is mechanically biased and in particular with a spring system or a weight system.
8. Elektrohydrostatisches Aktuatorsystem (1) nach einem der vorherigen Ansprüchen dadurch gekennzeichnet, dass die Hauptachse (20) mindestens eine zweite Kammer (24) aufweist, wobei die zweite Kammer (24) mit wenigstens einer zweiten Haupthydraulikleitung und einem zweiten Hauptventil (25) über eine  8. Electrohydrostatic actuator system (1) according to one of the preceding claims, characterized in that the main axis (20) has at least one second chamber (24), the second chamber (24) with at least a second main hydraulic line and a second main valve (25) a
Anschlussleitung mit der Hydromaschine (11) hydraulisch verbunden ist.  Connection line with the hydraulic machine (11) is hydraulically connected.
9. Elektrohydrostatisches Aktuatorsystem (1) nach einem der vorherigen Ansprüche dadurch gekennzeichnet, dass die Sekundärachse (30) mindestens eine zweite Kammer (34) aufweist, wobei die zweite Kammer (34) mit wenigstens einer zweiten Sekundärhydraulikleitung und einem zweiten Sekundärventil über eine  9. Electrohydrostatic actuator system (1) according to one of the preceding claims, characterized in that the secondary axis (30) has at least one second chamber (34), the second chamber (34) with at least a second secondary hydraulic line and a second secondary valve via a
Anschlussleitung mit der Hydromaschine (11) hydraulisch verbunden ist.  Connection line with the hydraulic machine (11) is hydraulically connected.
10. Elektrohydrostatisches Aktuatorsystem (1) nach den Ansprüchen 7 und 8 dadurch gekennzeichnet, dass die zweite Kammer (25) der Hauptachse (20) und die zweite Kammer (35) der Sekundärachse (30) mit der gleichen Anschlussleitung der Hydromaschine (11) hydraulisch verbunden sind, wobei die Anschlussleitung verschieden zu der Anschlussleitung der ersten Kammer (25) der Hauptachse (20) und die ersten Kammer (35) der Sekundärachse (30) ist.  10. Electrohydrostatic actuator system (1) according to claims 7 and 8, characterized in that the second chamber (25) of the main axis (20) and the second chamber (35) of the secondary axis (30) with the same connecting line of the hydraulic machine (11) hydraulically are connected, the connecting line being different from the connecting line of the first chamber (25) of the main axis (20) and the first chamber (35) of the secondary axis (30).
11. Elektrohydrostatisches Aktuatorsystem (1) nach den Ansprüchen 7 und 8 oder 9 dadurch gekennzeichnet, dass das zweite Hauptventil (25) und/oder das zweite Sekundärventil (35) gesteuerte Ventile sind.  11. Electrohydrostatic actuator system (1) according to claims 7 and 8 or 9, characterized in that the second main valve (25) and / or the second secondary valve (35) are controlled valves.
12. Elektrohydrostatisches Aktuatorsystem (1) nach den Ansprüchen 5 und 10 dadurch gekennzeichnet, dass mindestens eines der gesteuerten Ventile mittels eines Steuerungsventils entsperrbar ist.  12. Electrohydrostatic actuator system (1) according to claims 5 and 10, characterized in that at least one of the controlled valves can be unlocked by means of a control valve.
13. Elektrohydrostatisches Aktuatorsystem (1) nach Anspruch 11 dadurch  13. Electrohydrostatic actuator system (1) according to claim 11
gekennzeichnet, dass wenigstens eines der Steuerungsventile mittels Rückschlagventile an mindestens einer der Anschlussleitungen der Hydromaschine (11) hydraulisch verbunden sind. characterized in that at least one of the control valves by means of Check valves are hydraulically connected to at least one of the connecting lines of the hydraulic machine (11).
14. Elektrohydrostatisches Aktuatorsystem (1) nach einem der vorherigen Ansprüche dadurch gekennzeichnet, dass die Hauptachse eine Umformungsachse ist und die Sekundärachse eine Spannachse ist.  14. Electrohydrostatic actuator system (1) according to one of the preceding claims, characterized in that the main axis is a forming axis and the secondary axis is a clamping axis.
15. Verfahren zum Betreiben eines elektrohydrostatische Aktuatorsystem gemäß einem der Ansprüche 1 bis 14 dadurch gekennzeichnet, dass die Hauptachse (20) und die Sekundärachse (30) parallel oder sequentiell durch die gleiche Hydromaschine (11) betrieben werden.  15. A method for operating an electrohydrostatic actuator system according to one of claims 1 to 14, characterized in that the main axis (20) and the secondary axis (30) are operated in parallel or sequentially by the same hydraulic machine (11).
16. Verfahren zum Betreiben eines elektrohydrostatische Aktuatorsystem nach 16. A method of operating an electrohydrostatic actuator system
Anspruch 15 dadurch gekennzeichnet, dass das Hydraulikfluid in dem  Claim 15 characterized in that the hydraulic fluid in the
Hydrospeicher (40) beim Einspannen der Sekundärachse (30) aufgespannt wird. Hydraulic accumulator (40) is clamped when clamping the secondary axis (30).
17. Verwendung eines elektrohydrostatische Aktuatorsystem gemäß einem der 17. Use of an electrohydrostatic actuator system according to one of the
Ansprüche 1 bis 14 mit einem Verfahren gemäß den Ansprüchen 15 und 16 zur Umformung von Formteilen, Tiefziehen von Formteilen oder ähnliche  Claims 1 to 14 with a method according to claims 15 and 16 for forming molded parts, deep-drawing molded parts or the like
Verwendungen.  Uses.
EP19790498.0A 2018-11-13 2019-10-17 Electro-hydrostatic actuator system Active EP3880975B1 (en)

Applications Claiming Priority (2)

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DE102018128318.0A DE102018128318A1 (en) 2018-11-13 2018-11-13 Electrohydrostatic actuator system
PCT/EP2019/078273 WO2020099060A1 (en) 2018-11-13 2019-10-17 Electro-hydrostatic actuator system

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3609692B1 (en) * 2017-08-01 2021-07-21 Moog GmbH Apparatus for controlling the switch over of hydraulic cylinders
DE102021123910A1 (en) * 2021-09-15 2023-03-16 HMS - Hybrid Motion Solutions GmbH Hydraulic drive system with a 4Q pump unit
CN115026233A (en) * 2022-05-30 2022-09-09 湖州机床厂有限公司 Ring forging hydraulic press and control method thereof

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE894384C (en) 1948-11-09 1953-12-21 Clearing Machine Corp Hydraulic sheet metal drawing press
IT1260615B (en) 1993-03-02 1996-04-22 Fiat Auto Spa PROCEDURE AND HYDRAULIC PRESS FOR THE MOLDING OF SHEETS
EP1233191B1 (en) * 2001-02-17 2005-11-09 Globemag L.P. Hydraulic oscillator as a machine drive
JP4576639B2 (en) * 2005-05-16 2010-11-10 アイダエンジニアリング株式会社 Die cushion device for press machine
CN2852100Y (en) * 2005-12-23 2006-12-27 中国矿业大学 Hydraulic system of high-speed wire rope and gasket friction experiment machine
SE531309C2 (en) * 2006-01-16 2009-02-17 Volvo Constr Equip Ab Control system for a working machine and method for controlling a hydraulic cylinder of a working machine
CN106226161A (en) 2009-05-22 2016-12-14 国际计测器株式会社 Oil hydraulic system and general-purpose test device
DE102011116964A1 (en) * 2010-11-11 2012-05-16 Robert Bosch Gmbh Hydraulic axis
US9051714B2 (en) * 2011-09-30 2015-06-09 Caterpillar Inc. Meterless hydraulic system having multi-actuator circuit
DE102014218887B3 (en) * 2014-09-19 2016-01-28 Voith Patent Gmbh Hydraulic drive with fast lift and load stroke
DE102015210350A1 (en) * 2015-06-05 2016-12-08 Robert Bosch Gmbh Hydraulic circuit for pressure medium supply of a hydraulic consumer in a closed hydraulic circuit
JP6002285B1 (en) * 2015-07-10 2016-10-05 アイダエンジニアリング株式会社 Die cushion device combined with slide cushion device and control method thereof
AT518192B1 (en) * 2016-01-22 2017-11-15 Engel Austria Gmbh Hydraulic device for a molding machine
DE102016113882A1 (en) * 2016-07-27 2018-02-01 Moog Gmbh Electro-hydrostatic drive system
JP6646697B2 (en) * 2018-03-05 2020-02-14 アイダエンジニアリング株式会社 Cushion pin equalization device, die cushion device with cushion pin equalization function, and cushion pin equalization method
DE102018120000A1 (en) * 2018-08-16 2020-02-20 Moog Gmbh Electrohydrostatic actuator system with suction tank

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EP3880975B1 (en) 2022-12-07
US20220003250A1 (en) 2022-01-06

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