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WO2018189153A1 - Alimentation électrique autonome pour moteurs et pompes hydrostatiques - Google Patents

Alimentation électrique autonome pour moteurs et pompes hydrostatiques Download PDF

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Publication number
WO2018189153A1
WO2018189153A1 PCT/EP2018/059116 EP2018059116W WO2018189153A1 WO 2018189153 A1 WO2018189153 A1 WO 2018189153A1 EP 2018059116 W EP2018059116 W EP 2018059116W WO 2018189153 A1 WO2018189153 A1 WO 2018189153A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
hydraulic
hydraulic unit
adjustment element
adjustment
Prior art date
Application number
PCT/EP2018/059116
Other languages
English (en)
Inventor
Suenje Marsch
Harry Rasch
Bernd Hames
Andreas Schumacher
Original Assignee
Danfoss Power Solutions Gmbh & Co Ohg
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 Danfoss Power Solutions Gmbh & Co Ohg filed Critical Danfoss Power Solutions Gmbh & Co Ohg
Publication of WO2018189153A1 publication Critical patent/WO2018189153A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/002—Hydraulic systems to change the pump delivery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/28—Control of machines or pumps with stationary cylinders
    • F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/30—Control of machines or pumps with rotary cylinder blocks
    • F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
    • F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure

Definitions

  • the present invention relates according to the preamble of claim 1 to a variable displacement hydraulic unit comprising a casing, a positionable adjustment element for adjusting the dis- placement volume of the driving mechanism of the hydraulic unit and a control unit for controlling an adjustment unit featuring an actuator to position the adjustment element.
  • Variable displacement hydraulic units such as hydrostatic motors or pumps, are known from the state of the art. They generally comprise a servo control system with a servo piston slide-ably disposed in a servo cylinder.
  • the servo piston acts commonly via a piston rod on an adjustment element for adjusting the stroke or displacement of the hydraulic unit.
  • An exemplary adjustment element is a tiitable swash-plate in an axial piston hydraulic unit.
  • the position of the servo piston is controlled by supplying or draining hydraulic fluid to or from an end face of the servo piston under control of a control unit acting on a control valve.
  • the control unit comprises, for example, a microcontroller that controls electric power supplied to actuators of the control valve.
  • Hydraulic units of the state of the art require extensive wiring when they are mounted in their operating environment, such as agricultural machinery, like harvesters or tractors, or in building equipment, like road construction machines or vehicles, like excavators or graders. In these applications the hydraulic units are used for propelling the machinery or for driving auxiliary equipment, like forklifts or the shovels of excavators. At least for control purpose, the different actuators and sensors of the hydraulic unit must be connected to electronic control units and/or, if they are non-mechanically or non-hydraulically driven, to electrical power sources in order to operate properly. This entails the provision of electrical connectors and wiring that may have to be led over considerable distances in the equipment. Such wiring is susceptible to damage and entry of water and dirt, in particular at the connectors, given the rough and/or harsh environment and handling of the working machine. Also, an external power source or power supply must be provided that energizes the electrical components of a hydraulic unit.
  • the object of the invention is solved by providing a hydraulic unit that further comprises an integrated self-sustaining (autarkic) electrical power supply that is located in or at the casing of the hydraulic unit and that energizes at least the control unit and the actuator.
  • an integrated self-sustaining (autarkic) electrical power supply that is located in or at the casing of the hydraulic unit and that energizes at least the control unit and the actuator.
  • the invention eliminates space required for the installation of wire harnesses and minimizes the possibility of water ingression through electrical wires and connectors.
  • the risk of damage is reduced, because no wires can be damaged by the harsh environment present on, e.g., a building site.
  • downtime and maintenance are reduced.
  • a tedious and time consuming search for broken wires in such vehicles and machines is eliminated.
  • control unit comprises means capable to receive setting commands from a joystick or another remote controller external to the hydraulic unit in a wireless way or by a single Bus-signal line. These commands are processed in the control unit that generates voltages or currents to control the actuator.
  • control unit comprises a microprocessor that controls the entire operation of the hydraulic unit in accordance with the setting commands transmitted to the hydraulic unit by a remote controller, e.g., a joystick in the operator ' s cab.
  • the electrical power supply is an electrical generator that is drivable directly or indirectly by a rotating element of the driving mechanism.
  • a rotating element is, for example, a driving or driven shaft of the hydraulic unit.
  • the generator may be connected directly to this shaft or by means of an intermediate set of gears. Such a connection may be per- manent or temporary by means of a clutch that is activated when electrical power is required, e.g. to charge a rechargeable battery.
  • a section of such a shaft may be configured as the rotor of an electrical generator.
  • the electrical generator is integrated in a speed sensor provided to measure the rotational speed of a shaft of the hydraulic unit.
  • the electrical power supply is an electrical generator which is drivable by a hydraulic flow within the hydraulic unit.
  • a hydraulic flow for driving the generator can be provided by a charge pump within the hydraulic unit or may be branched- off of a system pressure line, a working line or a loop-flushing line of the hydraulic unit.
  • the electrical generator may be integrated in a flow meter present in one of the hydraulic fluid lines of the hydraulic unit.
  • Still another embodiment of the present invention ensues from an electrical power supply that further comprises a rechargeable battery for providing electric current to the control unit or to a microcontroller and/or to the actuator and/or to sensors located within the hydraulic unit.
  • a rechargeable battery for providing electric current to the control unit or to a microcontroller and/or to the actuator and/or to sensors located within the hydraulic unit.
  • the rechargeable battery is chargeable by the generator.
  • the electrical generator used in implementing the invention may be of an alternating current type (AC) or of a direct current type (DC). If the output of the generator is used to charge a rechargeable battery it is preferred to use a DC-generator or to provide an AC/DC converter if an AC-generator is used.
  • the output voltage and/or current of the generator is regulated as required from the components of the hydraulic unit.
  • the necessary hardware is included in the package of the hydraulic unit of the invention. Such hardware is well known in the state of the art, so that further details are not necessary for their definition.
  • the present invention also includes a control unit that is configured as an on-off switching de- vice that in a first state of operation supplies electrical power from the power supply to one or more actuators of a control valve and in a second state of operation isolates the one or more actuators from the power supply.
  • the switching device is configured to provide several different voltage levels that are selectable by means of a wireless command module.
  • the control unit comprises means capable to receive in a wireless way or by a single Bus-signal line setting commands from a joystick or another remote controller external to the hydraulic unit.
  • a preferred embodiment of the invention includes a microcontroller or micropro- cessor that is integrated in the hydraulic unit and that is configured to receive external command signals that are transmitted in a wireless manner.
  • These command signals can be provided in an exemplary manner by command modules that emit coded electromagnetic or optical radiation, such as infrared.
  • command modules may be hand-held or alternatively mounted in the cabin of, for example, a tractor, excavator or grader.
  • the hydraulic unit of the invention is equipped with appropriate sensors or antennas that can receive the command signals and feed them to the control unit.
  • control unit comprises an electronic displacement unit (EDC) and the actuator is a solenoid which can be commanded by a microcontroller or a switching unit in order to change the position of the control spool in the control unit.
  • EDC electronic displacement unit
  • control spool is configured to control at least one hydraulic pressure supplied to or discharged from the adjustment unit in order to move the adjustment element.
  • the adjustment unit e.g., comprises a servo unit, whose servo piston is capable to position the adjustment element, wherein the servo piston can be pressurized single-sided or double-sided.
  • the control spool can act also mechanically, i.e. directly on the adjustment unit and/or the adjustment element.
  • the hydraulic unit is of the axial piston type featuring a tiltable swashplate or bent axis as positionable adjustment element, wherein the adjustment element is tiltable from an initial position in only one direction or in two directions.
  • the fluid flow in the hydraulic unit may be selected in two opposite directions.
  • the hydraulic unit is of the radial piston type or the orbiter type, wherein the adjustment unit is capable to change the eccentricity of the adjustment element with respect to a drive shaft axis of the driving mechanism.
  • the invention also includes a hydraulic unit in which the adjustment unit is of a purely electromechanical design.
  • the control valve and the servo unit are replaced by an electrical actuator that directly or indirectly exerts a force on the adjustment element of the driving unit.
  • the actuator can be realized in the form of an electro-magnet with a push-rod connected, for example, to a tiltable swash-plate or by an electro motor with a rack and pinion coupling to the swash-plate. It is understood, that this modification of the hydraulic unit applies also to variable displacement radial piston hydraulic motors or pumps, and are covered by the knowledge of a person with skills in the relevant art, hence covered also by the inventive idea.
  • the present invention also includes a hydraulic unit that further comprises one or more sensors that monitor the operation of the hydraulic unit and whose signals are routed to the control unit in order to control its operation.
  • exemplary sensors are capable to detect the angle or eccentricity of the adjustment element or the rotational speed of the driving mechanism.
  • Other sensors monitor the flow rate within a hydraulic line or the pressure within a hydraulic line.
  • Still other sensors may be provided to determine the temperature of the hydraulic fluid or a physical com- ponent of the hydraulic unit.
  • sensors that determine the charge and/or generating level of the electrical power supply are provided in implementing the invention. It is clear that any combination of the mentioned sensors can be selected in implementing the invention.
  • the signal or the signals of the one or more sensors are transmittable to the control unit, e.g., a microcontroller, and/or to a joystick or to a remote controller external to the hydraulic unit in a wireless way or via a Bus-signal line.
  • control unit e.g., a microcontroller, and/or to a joystick or to a remote controller external to the hydraulic unit in a wireless way or via a Bus-signal line.
  • Figure 1 shows a first embodiment of a hydraulic unit according to the invention in a schematic representation
  • Figure 2 depicts schematically a second embodiment of a hydraulic unit according to the invention
  • FIG. 1 shows an exemplary embodiment of a hydraulic unit 1 according to the invention in a schematic presentation.
  • the hydraulic unit 1 comprise a casing 50 in which a driving mechanism 2 is located, for example a variable adjustable driving mechanism 2 of a variable displacement pump, as shown in Figure 1 .
  • the displacement volume of the driving mechanism 2 - comprising in case of an axial piston pump a rotatable driveable cylinder block in which work pistons can reciprocate - is determined in this case by the angle position of an adjustment element 3 limiting the stroke of the pistons.
  • This adjustment element 3 may be positioned, for example, by a lever or rod.
  • the adjustment element 3 may be configured as a swash plate, a bent axis or as any other suitable mechanism for setting the operational parameters of driving mechanisms of hydraulic units.
  • the position of the adjustment element 3 is controlled by means of an adjustment unit 7 that is under control of a control unit 9.
  • Driving mechanism 2 is fluidiy connected to two pressure lines, e.g. a high pressure line 1 1 for delivering hydraulic fluid under high pressure, e.g. to a hydraulic motor, and a low pressure line 12 that supplies fluid to be pressurized by the driving mechanism 2 of the hydraulic pump 1 .
  • Both pressure lines 1 1 and 12 can be connected to a closed hydraulic fluid circuit between a hydraulic motor, not shown in Figure 1 , and the pump ' s driving mechanism 2, which, in this exemplary embodiment, is part of a hydraulic pump 1 having an input drive shaft 29.
  • the driving mechanism 2 is driven through a driving shaft 29 connected to an internal combustion engine 100 such as a diesel engine.
  • a coupling mechanism 101 can be provided that can be incorporated fully or in part in cas- As shown in Figure 1 in an exemplary and non-limiting manner, a fraction of the high pressure fluid is branched off from high pressure line 1 1 and routed through an electrical generator 13 to low pressure line 12.
  • the voltage output of generator 13, assumed here to be of an alternating current (AC) type, is led by electrical wiring, represented here as electrical lines 15 and 16 to an AC/DC converter.
  • This AC/DC converter is configured to provide DC currents at one or several voltage levels as required by control unit 9, a rechargeable battery 14 and/or an adjustment unit 7.
  • AC/DC converter 28 may be configured to be under control of control unit 9.
  • generator 13 serves mainly to charge battery 14 and to keep its voltage at an essentially constant level as needed to keep hydraulic unit 1 functional.
  • This set-up corresponds to a preferred embodiment of the integrated self-sustaining (autarkic) power supply 10 of the invention.
  • Control unit 9 may be configured as a microcontroller in a preferred embodiment of the invention.
  • control unit 9 is in the form of a signal receiving and current switching device that directly supplies power derived from power supply 10 and of a predetermined level to actuators present in adjustment unit 7.
  • a switching device is activated by means of external signal supplied from an external command module in a wireless manner or by a Bus-line or by mechanical means.
  • Such a signal e.g., can be received by an antenna 30 and guided for instance by a signal line 31 to control unit 9.
  • Control unit 9 is connected to adjustment unit 7 by means of at least one power line 19 and at least one signal line 18.
  • Power line 19 supplies one or more actuators present in the adjustment unit 7 with current as required to set the stroke or displacement of the driving mechanism 2.
  • the actuators not shown in Figure 1 , move the adjustment element 3, for example a swash plate, to a desired position as determined by control unit 9.
  • Signal line 18 represents one or more electrical connections that lead from sensors, not shown in Figure 1 , to control unit 9.
  • sensors monitor and measure certain parameters required for the proper operation of hydraulic unit 1 . These parameters may include pressure levels of the hydraulic fluid at various positions in the hydraulic unit 1 or flow rates or rotational speeds of the drive shaft 29, e.g., or the position of adjustment element 3.
  • Other power and signal lines, not shown in Figure 1 may lead to other components of hydraulic unit 1 , such as sensors or actuators forming part of hydraulic unit 1 and situated in or on casing 50 of hydraulic unit 1 .
  • the generator 13 is of a direct current (DC) type, which obviates the need for a current or voltage converter.
  • generator 13 can be powered in many different ways in implementing the invention.
  • the hydraulic fluid under pressure driving the generator 13 could be provided by the output of the pump in hydraulic unit 1 in a system pressure line, as shown in Figure 1 or by a charge pump or branched off from a loop flushing line of hydraulic unit 1 .
  • the generator 13 could be driven by purely mechanical means, as will be explained in more detail below.
  • FIG 2 a particularly preferred embodiment of a hydraulic unit 1 of the invention is depicted in a schematic manner. Shown is a simplified version of a conventional type of a hydraulic motor that is widely used in the state of the art.
  • adjustment unit 7 comprises a control valve 24 and a servo unit 4 with a servo cylinder 5 and a servo piston 6 slide-ably mounted therein.
  • the driving mechanism 2 depicted in Figure 2 is assumed to be a variable displacement hydrostatic motor that is powered by hydraulic fluid under pressure provided by a high pressure line 1 1 connected to a hydraulic pump, not shown in Figure 2.
  • a hydraulic line 21 connected to a two-way check valve 20 branches off from high pressure line 1 1 and leads to control valve 24.
  • Control valve 24 has an outlet line 27 with a through flow reducing orifice 22 that leads to servo cylinder 5.
  • Fluid flows through the con- trol valve 24, and regulates the pressure level in a front chamber of the servo cylinder 5 by means of an actuator 8, acting on one side of a control piston 25.
  • the actuator 8 is energized by the control unit 9.
  • a spring 26, whose action opposes that of actuator 8, is provided for moving control piston 25 in control valve 24 back to the initial position, when the actuator 8 is de- energized.
  • Control unit 9 comprises, for example, a microcontroller and means to convert the output of generator
  • control unit 9 Connected to control unit 9 is a rechargeable battery
  • an electrical power line 17 connects control unit 9 with an actuator 8 of control valve 24. Activation of actuator 8 through power line 17 shifts control piston 25 of control valve 24 thus regulating the flow of hydraulic fluid to servo unit 4, which changes the position of adjustment element 3. This in turn sets the displacement of driving mechanism 2 and hence the maximum available torque and speed of rotation at driving shaft 29.
  • Power line 17 represents symbolically any electrical connection that supplies power to actuators or other similar components of hydraulic unit 1 .
  • Control unit 9 is also in communication by means of a signal line 18 with a sensor 23.
  • This sensor 23 is configured here as a rotational speed sensor for driving shaft 29.
  • generator 13 is integrated with a rotational speed sensor operably connected to driving shaft 29.
  • the electrical power required to activate and operate control unit 9, adjustment unit 7 and sensors 23, is provided in a preferred embodiment by the rechargeable battery 14 provided in or at casing 50, e.g. on the outside of casing 50.
  • the charge level of this battery 14 is maintained by current provided by electrical generator 13 when driving mechanism 2 is in motion, as shown in Figure 2, or when hydraulic fluid drives generator 13, as depicted in Figurel .
  • an initial rotation of driving shaft 29 under action of internal combustion engine 100 would cause driving mechanism 2 to rotate and produce electricity in generator 13 that is coupled either hydraulically or mechanically to the driving mechanism 2.
  • This electricity powers control unit 9 that in turn activates the other components of hydraulic unit 1 .
  • driving mechanism 2 is initially set at maximal displacement when actuator 8 is de-energized, because then a sufficient flow of hydraulic fluid to power generator 13 is produced instantly. As soon as the produced power level is sufficient to operate control unit 9 and adjustment unit 7 of the hydraulic unit 1 can be operated in the same manner as known from the state of the art, without electrical power supply lines to the hydraulic unit 1 .
  • the casing 50 contains all electrical and mechanical components of hydraulic unit 1 .
  • hydraulic unit 1 requires no external electrical cabling or connections, with the possible exception of an antenna or a sensor for the reception of external wirelessly transmitted command signals or a single Bus line for the input of such signals.
  • casing 50 is provided solely with connection elements for supply and drainage of hydraulic fluid and with coupling elements for connecting the driving shaft 29 of driving mechanism 2, preferable with a gear box axel or with an internal combustion engine 100 or a drive train or any other propel application.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

L'invention concerne une unité hydraulique à cylindrée variable (1) comprenant un boîtier (50), un élément de réglage positionnable (3) pour régler le volume de déplacement d'un mécanisme d'entraînement (2) et une unité de commande (9) pour commander une unité de réglage (7) comportant un actionneur (8) pour positionner l'élément de réglage (3). L'unité hydraulique (1) comprend en outre une source d'alimentation électrique autonome (autarcique) intégrée (10) qui est située dans ou sur le boîtier (50) et qui alimente au moins l'unité de commande (9) et l'actionneur (8).
PCT/EP2018/059116 2017-04-13 2018-04-10 Alimentation électrique autonome pour moteurs et pompes hydrostatiques WO2018189153A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017206415.3 2017-04-13
DE102017206415.3A DE102017206415A1 (de) 2017-04-13 2017-04-13 Selbsterhaltende stromversorgung für hydrostatische pumpen und motoren

Publications (1)

Publication Number Publication Date
WO2018189153A1 true WO2018189153A1 (fr) 2018-10-18

Family

ID=62002121

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/059116 WO2018189153A1 (fr) 2017-04-13 2018-04-10 Alimentation électrique autonome pour moteurs et pompes hydrostatiques

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DE (1) DE102017206415A1 (fr)
WO (1) WO2018189153A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019211466B3 (de) 2019-07-31 2020-10-15 Danfoss Power Solutions Gmbh & Co. Ohg Hydraulikeinheit mit variabler Verdrängung sowie Verfahren zum Betreiben einer Hydraulikeinheit
DE112021007138T5 (de) 2021-03-26 2023-12-21 Circor Pumps North America, Llc Hocheffizientes dichtungsölsystem
IT202100019937A1 (it) * 2021-07-27 2023-01-27 Sti S R L Posizionatore intelligente e wireless

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD211603A1 (de) 1982-11-18 1984-07-18 Orsta Hydraulik Veb K Verstelleinrichtung fuer radialkolbenmaschinen mit veraenderlichem verdraengungsvolumen
DE3907409A1 (de) * 1989-03-08 1990-09-20 Bosch Gmbh Robert Einrichtung an einer verstellbaren hydrostatischen pumpe
EP2138720A2 (fr) * 2008-06-24 2009-12-30 MALI Holding AG Dispositif de réglage pour le réglage de machines à pistons axiaux.
EP2693054A1 (fr) 2012-08-01 2014-02-05 Sauer-Danfoss GmbH & Co. OHG Dispositif de commande pour entraînements hydrostatiques

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1959547A3 (fr) * 2008-04-21 2009-03-04 Eberhard Kist Installation de production de courant
DE202012001910U1 (de) * 2012-02-17 2012-03-28 Gerhard Bauer Hydraulische Windkraftanlage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD211603A1 (de) 1982-11-18 1984-07-18 Orsta Hydraulik Veb K Verstelleinrichtung fuer radialkolbenmaschinen mit veraenderlichem verdraengungsvolumen
DE3907409A1 (de) * 1989-03-08 1990-09-20 Bosch Gmbh Robert Einrichtung an einer verstellbaren hydrostatischen pumpe
EP2138720A2 (fr) * 2008-06-24 2009-12-30 MALI Holding AG Dispositif de réglage pour le réglage de machines à pistons axiaux.
EP2693054A1 (fr) 2012-08-01 2014-02-05 Sauer-Danfoss GmbH & Co. OHG Dispositif de commande pour entraînements hydrostatiques

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Publication number Publication date
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