EP4080062A1 - Elektrohydraulisches stellglied und verfahren - Google Patents

Elektrohydraulisches stellglied und verfahren Download PDF

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Publication number
EP4080062A1
EP4080062A1 EP22168727.0A EP22168727A EP4080062A1 EP 4080062 A1 EP4080062 A1 EP 4080062A1 EP 22168727 A EP22168727 A EP 22168727A EP 4080062 A1 EP4080062 A1 EP 4080062A1
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EP
European Patent Office
Prior art keywords
hydraulic
hydraulic unit
chamber
actuator
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP22168727.0A
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English (en)
French (fr)
Inventor
Mika SAHLMAN
Peter Stambro
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.)
NORRHYDRO Oy
Original Assignee
NORRHYDRO Oy
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 NORRHYDRO Oy filed Critical NORRHYDRO Oy
Publication of EP4080062A1 publication Critical patent/EP4080062A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005—With rotary or crank input
    • F15B7/006—Rotary pump input
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—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
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20569—Type of pump capable of working as pump and 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
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—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
    • F15B2211/60—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
    • F15B2211/70—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
    • F15B2211/7052—Single-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
    • F15B2211/705—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
    • F15B2211/76—Control of force or torque of the output member
    • F15B2211/761—Control of a negative load, i.e. of a load generating hydraulic energy
    • 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
    • F15B2211/76—Control of force or torque of the output member
    • F15B2211/763—Control of torque of the output member by means of a variable capacity motor, i.e. by a secondary control on the 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/785—Compensation of the difference in flow rate in closed fluid circuits using differential actuators
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/88—Control measures for saving energy

Definitions

  • the present invention relates to electrohydraulic actuators.
  • Electro-hydraulic actuators are apparatuses, in which at least a fluid pressure actuator, a pump driving the actuator and an electric motor rotating the pump are combined. Electro-hydraulic actuators are used in applications, where it is beneficial not to have an external hydraulic system with external pumps, tubing and the like. Electro-hydraulic actuators are also used in applications, where simplicity of system architecture and safety and reliability are essential, such as in aerospace industry.
  • An object of the present invention is to provide a new type of an electrohydraulic actuator and a new method.
  • the object of the invention is achieved by a method and an electrohydraulic actuator which are characterized by what is stated in the independent claims. Some embodiments of the invention are disclosed in the dependent claims.
  • an electrohydraulic actuator comprises an electric motor, a first hydraulic unit, and a second hydraulic unit.
  • the electric motor, the first hydraulic unit, and the second hydraulic unit are connected together such that they convey energy between them.
  • the first hydraulic unit is arranged to feed hydraulic fluid to a hydraulic actuator and the electric motor is arranged to control the feed of hydraulic fluid to the hydraulic actuator by means of the first hydraulic unit.
  • the second hydraulic unit is connected to a hydraulic accumulator. Furthermore, when one of the first hydraulic unit and the second hydraulic unit displaces hydraulic fluid to its pressure port the other may be arranged to displace hydraulic fluid to a low-pressure port and vice versa.
  • Electrical energy may be transferred to pressure, for example.
  • the energy stored to the hydraulic accumulator may be reused.
  • the energy from the hydraulic accumulator may be used for providing higher momentary power, for example. It is also possible to transfer energy stored to the hydraulic accumulator to electric network. Also, the speed of the hydraulic actuator is controlled in a simple manner. All in all, the solution is simple and reliable.
  • the first hydraulic unit is a fixed displacement hydraulic unit.
  • Such a solution is easy to implement and durable. Because the electric motor rotates the fixed displacement hydraulic unit the control of the hydraulic actuator is versatile.
  • the second hydraulic unit is a variable displacement hydraulic unit.
  • the control of the flows of the hydraulic fluid may be made in various ways and still the electric motor and the variable displacement hydraulic unit may be simply mechanically connected.
  • the variable displacement hydraulic unit may be arranged to displace hydraulic fluid. When both the hydraulic units rotate, they displace hydraulic fluid as described above.
  • the electric motor, the first hydraulic unit, and the second hydraulic unit are mechanically connected to each other.
  • Such a solution is durable.
  • variable displacement hydraulic unit is non-overcenter. Such a solution is cost effective.
  • the hydraulic actuator may be a single-acting cylinder, a double acting cylinder, or a rotating cylinder.
  • the hydraulic actuator is a single-acting cylinder and when one of the first hydraulic unit and the second hydraulic unit displaces hydraulic fluid to its pressure port the other may be arranged to displace hydraulic fluid to a tank via the low-pressure port and vice versa.
  • FIG. 1 shows an electrohydraulic actuator 1.
  • the electrohydraulic actuator 1 comprises a first hydraulic unit 2.
  • the first hydraulic unit 2 may be a rotating hydraulic unit such as a hydraulic pump/motor.
  • the first hydraulic unit 2 is a fixed displacement hydraulic unit.
  • the first hydraulic unit 2 is connected to a hydraulic actuator 3.
  • the hydraulic actuator 3 in Figure 1 is a single-acting cylinder. Feeding hydraulic fluid by the first hydraulic unit 2 to a chamber 4 of the hydraulic actuator 3 raises the piston 5 of the hydraulic actuator 3.
  • the electric motor 6 rotates the first hydraulic unit 2.
  • means for controlling the electric motor are not shown in Figure 1 .
  • characteristics to an electrohydraulic actuator electric motor 6 is arranged to control the feed of hydraulic fluid to the hydraulic actuator 3 by means of the first hydraulic unit 2.
  • the electrohydraulic actuator 1 also comprises a second hydraulic unit 7.
  • the second hydraulic unit 7 may be a rotating hydraulic unit such as a hydraulic pump/motor. In the embodiment shown in Figure 1 the second hydraulic unit 7 is a variable displacement hydraulic unit.
  • the second hydraulic unit 7 is connected to a hydraulic accumulator 8.
  • the electric motor 6, the first hydraulic unit 2, and the second hydraulic unit 7 are connected together such that they convey energy between them.
  • the electric motor 6, the first hydraulic unit 2, and the second hydraulic unit 7 may be mechanically or electrically connected to each other.
  • the second hydraulic unit 7 displaces hydraulic fluid via its low-pressure port 7b to a tank 9 and vice versa.
  • first hydraulic unit 2 displaces hydraulic fluid to its pressure port
  • second hydraulic unit 7 displaces hydraulic fluid via its low-pressure port 7b to the tank 9.
  • energy stored as pressure to the hydraulic accumulator 8 may be used for boosting the feed of hydraulic fluid to the hydraulic actuator 3.
  • hydraulic fluid may be fed from the hydraulic accumulator 8 to rotate the second hydraulic unit 7. Because the hydraulic units 2 and 7 are connected such that they convey energy between them the energy in the hydraulic accumulator 8 enhances feeding the fluid to the hydraulic actuator 3.
  • the piston 5 When the piston 5 is allowed to lower due to gravity, for example, the piston 5 pushes hydraulic fluid to the first hydraulic unit 2 rotating it.
  • the first hydraulic unit 2 displaces hydraulic fluid via its low-pressure port 2b to the tank 9.
  • the rotation of the first hydraulic unit 2 causes the second hydraulic unit 7 to displace hydraulic fluid to its pressure port 7a and therethrough to the hydraulic accumulator 8.
  • Energy is thus stored to the hydraulic accumulator 8.
  • electric energy from an electric network may be stored to the hydraulic accumulator 8 such that the electric motor 6 is rotated, naturally providing that not all the energy supplied to the electric motor 6 is used for other purposes such as raising the piston 5.
  • Figures 2 , 3, and 4 show electrohydraulic actuators 1 having double acting cylinders 3.
  • hydraulic fluid is fed either to a first chamber 4a or to a second chamber 4b.
  • Feeding hydraulic fluid to the first chamber 4a moves the piston 5 upwards in the Figures.
  • Feeding hydraulic fluid to the second chamber 4b moves the piston 5 downwards in the Figures.
  • one of the ports of the first hydraulic unit 2 is not directly connected to the tank 9 but to a hydraulic line 11 connected to the second chamber 4b of the hydraulic actuator 3. All in all, the embodiment shown in Figure 2 is simple and reliable. However, when the volumes on the opposite sides of the piston 5 are different, energy cannot be recovered efficiently when the pressure raises above a pressure limit.
  • the solutions shown in Figures 3 and 4 obviate the shortcoming mentioned in connection with the embodiment shown in Figure 2 .
  • the embodiment shown in Figure 3 comprises a third hydraulic unit 10, which is connected to the first hydraulic unit 2, and the second hydraulic unit 7 such that they convey energy between them.
  • the third hydraulic unit 10 may be a rotating hydraulic unit such as a hydraulic pump/motor.
  • the third hydraulic unit 10 is a fixed displacement hydraulic unit.
  • one of the ports of the second hydraulic unit 7 is directly connected to the hydraulic accumulator 8 and the other port of the second hydraulic unit 7 is directly connected to the tank 9.
  • one of the ports of the second hydraulic unit 7 is not directly connected to the tank 9 but to a hydraulic line 11 connected to the second chamber 4b of the hydraulic actuator 3.
  • the embodiment shown in Figure 4 does not need so many rotating hydraulic units as the embodiment shown in Figure 3 .
  • valves needed are not mainly shown in the Figures.
  • the hydraulic actuator 3 is a double acting cylinder having the first chamber 4a on the first side of the piston 5 and the second chamber 4b on the second side of the piston 5.
  • One of the ports of the first hydraulic unit 2 is directly connected to the first chamber 4a and the other port of the first hydraulic unit 2 is directly connected to the second chamber 4b.
  • One of the ports of the second hydraulic unit 7 is directly connected to the hydraulic accumulator 8 and the other port is directly connected to the second chamber 4b.
  • the other port of the second hydraulic unit 7 may be directly connected either to the second chamber 4b or to the first chamber 4a, especially when the volumes of the first chamber 4a and the second chamber 4b are equal.
  • the volume of the second chamber 4b is smaller than the volume of the first chamber 4a. That means that the effective surface area of the piston 5 on the side of the second chamber 4b is smaller than the effective surface area of the piston 5 on the side of the first chamber 4a. If the volume of the second chamber 4b is smaller than the volume of the first chamber 4a it is preferable that the other port of the second hydraulic unit 7 is directly connected to the second chamber 4b to enhance efficient energy recovery and overall operation of the electrohydraulic actuator 1.
  • both the first hydraulic unit 2 and the second hydraulic unit 7 are fixed displacement hydraulic units.
  • the electric motor 6, the first hydraulic unit 2, and the second hydraulic unit 7 are electrically connected to each other.
  • variable displacement hydraulic unit may be non-overcenter.
  • the hydraulic actuator 3 is a double acting cylinder, or a rotating cylinder the second hydraulic unit 7 may be over-center.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
EP22168727.0A 2021-04-23 2022-04-19 Elektrohydraulisches stellglied und verfahren Withdrawn EP4080062A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20215477 2021-04-23

Publications (1)

Publication Number Publication Date
EP4080062A1 true EP4080062A1 (de) 2022-10-26

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EP22168727.0A Withdrawn EP4080062A1 (de) 2021-04-23 2022-04-19 Elektrohydraulisches stellglied und verfahren

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641644A1 (de) * 1993-09-02 1995-03-08 Maschinenfabrik Müller-Weingarten AG Verfahren zur Regelung des Antriebs einer hydraulischen Presse und Vorrichtung zur Durchführung des Verfahrens
DE102004061559A1 (de) * 2004-12-21 2006-06-29 Brueninghaus Hydromatik Gmbh Hydraulischer Antrieb
CN1987124A (zh) * 2006-12-14 2007-06-27 浙江大学 一种液压配重可变的节能液压升降***
CN101956405A (zh) * 2010-07-15 2011-01-26 吉林大学 一种工程机械动臂下降的重力势能回收装置
EP2640657A2 (de) * 2010-11-18 2013-09-25 National Oilwell Varco Norway AS Hebungsausgleichssystem
CN107131159A (zh) * 2017-06-20 2017-09-05 北京交通大学 重力载荷下电动静液作动***

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641644A1 (de) * 1993-09-02 1995-03-08 Maschinenfabrik Müller-Weingarten AG Verfahren zur Regelung des Antriebs einer hydraulischen Presse und Vorrichtung zur Durchführung des Verfahrens
DE102004061559A1 (de) * 2004-12-21 2006-06-29 Brueninghaus Hydromatik Gmbh Hydraulischer Antrieb
CN1987124A (zh) * 2006-12-14 2007-06-27 浙江大学 一种液压配重可变的节能液压升降***
CN101956405A (zh) * 2010-07-15 2011-01-26 吉林大学 一种工程机械动臂下降的重力势能回收装置
EP2640657A2 (de) * 2010-11-18 2013-09-25 National Oilwell Varco Norway AS Hebungsausgleichssystem
CN107131159A (zh) * 2017-06-20 2017-09-05 北京交通大学 重力载荷下电动静液作动***

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