EP3536976B1 - Actionneur avec accumulateur - Google Patents

Actionneur avec accumulateur Download PDF

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Publication number
EP3536976B1
EP3536976B1 EP18160844.9A EP18160844A EP3536976B1 EP 3536976 B1 EP3536976 B1 EP 3536976B1 EP 18160844 A EP18160844 A EP 18160844A EP 3536976 B1 EP3536976 B1 EP 3536976B1
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EP
European Patent Office
Prior art keywords
storage
actuator
hydraulic fluid
energy
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18160844.9A
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German (de)
English (en)
Other versions
EP3536976A1 (fr
Inventor
Georg Bachmaier
Patrick Fröse
Wolfgang Zöls
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.)
Metismotion GmbH
Original Assignee
Metismotion GmbH
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 Metismotion GmbH filed Critical Metismotion GmbH
Priority to EP18160844.9A priority Critical patent/EP3536976B1/fr
Priority to DK18160844.9T priority patent/DK3536976T3/da
Publication of EP3536976A1 publication Critical patent/EP3536976A1/fr
Application granted granted Critical
Publication of EP3536976B1 publication Critical patent/EP3536976B1/fr
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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
    • F15B1/027—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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators

Definitions

  • the invention relates to a memory actuator and a method for operating a memory actuator.
  • an actuator is understood to be a device or a device that converts electrical signals into mechanical movement or another physical quantity and can thus perform work.
  • actuator concepts such as hydraulic or pneumatic actuators.
  • solid-state actuators and polymer actuators are also so-called solid-state actuators and polymer actuators.
  • One form of a solid-state actuator is the piezo actuator, in which a directional deformation of a piezoelectric material (piezo for short) is used to perform work. If a piezo actuator is combined with a hydraulic system, a so-called piezo hydraulic actuator is obtained. All actuator concepts have in common that when the actuator moves mechanically, it does work. The, in particular mechanical, power provided by the actuator depends essentially on the product of force and speed.
  • This product results in a code number of the actuator that characterizes the respective actuator. If more power is required in an application than the actuator can provide, a larger variant of the actuator is usually used, for example. In the case of piezo actuators, for example, this can be a version with a larger volume, for example the drive. However, simply enlarging the actuator can lead to high costs. In addition, the space required for the corresponding actuator increases, which is undesirable or not feasible in some applications, for example in special medical applications. As an alternative to larger actuator versions, there is also the option of using actuators that have a different actuator concept. However, this is often not possible because of the desired efficiencies and thus Services cannot be realized using an alternative actuator concept either.
  • the U.S. 6,070,408 A discloses a hydraulic device with hydraulic supply means and an accumulator with a pressure piston and means for sensing the accumulator piston position to indicate a load request to a control means to selectively actuate the hydraulic supply device to meet the hydraulic load request and provide a relative pressure pulse-free operation by actuating the hydraulic supply device in response to the position and movement of the accumulator piston.
  • the EP 3 045 737 A1 discloses a hydraulic loading and propulsion system, an aircraft using the same, and corresponding methods for extending and retracting a hydraulic actuator. Furthermore, from the DE 10 2017 205 404 A1 a hydraulic control device is known.
  • the object of the present invention is therefore to create a storage actuator and a method for operating such a storage actuator, the output device of which can be operated with a particularly high output.
  • a first aspect of the invention relates to a storage actuator for actuating an output device, with the output device, with at least one energy store and with a drive device.
  • energy is in the energy store in at least one first operating state of the storage actuator storable.
  • the storage actuator has at least one second operating state, in which at least part of the energy stored in the energy storage can be provided by the energy storage, whereby the output device can be supplied with the provided energy and can thereby be actuated.
  • the first operating state can be referred to as the memory state.
  • the second operating state can be referred to as the actuating state.
  • the storage actuator according to the invention has the advantage that, due to the at least two operating states and the associated storage of the energy in the first operating state and the subsequent release of the energy in the second operating state, the output device can be operated with a particularly high output.
  • the output device is preferably a mechanical output device.
  • At least one reservoir is provided for providing a hydraulic fluid.
  • the hydraulic fluid can be conveyed into the energy store by means of the drive device, whereby the energy can be stored in the energy store, with the energy store in the second operating state at least part of the hydraulic fluid stored in the energy store and thereby at least part of the hydraulic fluid stored in the energy store Provides energy, whereby the output device can be actuated by means of the hydraulic fluid provided.
  • the components can be a weight that is lifted into a storage position, the kinetic energy being converted into positional energy, that is to say potential energy.
  • the component can have at least one, in particular elastic, deformable element and / or one compressible Include fluid, wherein the element is deformed and / or the fluid is compressed, the hydraulic fluid is introduced into the energy store.
  • the component stores energy which is transmitted by means of the hydraulic fluid.
  • energy is stored by means of the energy store.
  • the energy store can store the energy.
  • the energy can also be converted into pressure and / or deformation energy instead of into position energy, for example by deforming and / or compressing the component.
  • the stored energy can be released again, in particular back into or to the hydraulic fluid.
  • energy in particular in the form of pressure energy
  • the energy store can be filled with energy particularly easily by means of the hydraulic fluid, so that the output device can be operated particularly advantageously with a particularly high output.
  • the storage actuator comprises at least the drive device having a drive actuator for conveying the hydraulic fluid.
  • the storage actuator comprises the energy store for storing hydraulic fluid or energy that can be transmitted by the hydraulic fluid.
  • the, in particular hydraulic, accumulator actuator comprises a chamber with a piston element arranged movably in the chamber, which divides the chamber into a first chamber area, in which the hydraulic fluid can be conveyed by means of the drive device, and a second chamber area. The piston element can be moved from a first position into a second position by means of or by conveying the hydraulic fluid into the first chamber region.
  • the storage actuator comprises at least one resetting device, by means of which the piston element can be moved from the second position into the first position, in which the piston element releases the second flow opening and blocks the first flow opening, so that at least part of the hydraulic fluid introduced into the energy storage device is released from the Energy store can be introduced into the second chamber region via the second through-flow opening.
  • the storage actuator has an output device which can be supplied and thereby driven with at least part of the hydraulic fluid introduced into the second chamber area.
  • the first position in which the piston element can be located can also be referred to as the actuation position and characterizes an actuation phase or the actuation state of the entire storage actuator.
  • the second position can also be referred to as the storage position, in which the storage actuator, in particular its drive device comprising the drive actuator, provides mechanical energy by means of which the hydraulic fluid is supplied to the energy store, so that energy is stored in the energy store by means of the hydraulic fluid. If the piston element is in the storage position, the actuator, in particular the piston element, is in the storage state or the first operating state.
  • a particularly large mechanical output can be provided by the storage actuator.
  • the piston element according to the invention which divides the chamber into a first chamber area and a second chamber area, makes it possible to store a particularly large, predeterminable amount of energy and a corresponding amount in the form of power through the first position and second position that it can occupy on the output device of the storage actuator to provide or to deliver.
  • the storage actuator works in two phases, or it has at least the two mentioned operating states: the storage state, during which the piston element is in the second position or storage position, and the actuation state, during which the piston element is in the first position or actuation position .
  • the storage actuator according to the invention is particularly suitable for applications in which a trigger time of the storage actuator plays a secondary role, but in which a particularly high output with as constant a force and speed as possible over the entire actuation phase is desired on the output device.
  • the period during which the actuation takes place that is to say the duration of the actuation phase, is the actuation time, that is to say the time during which a position or movement takes place on the output device.
  • the trigger time is the time that elapses from the first actuation of the drive actuator or its switching on until the actuation begins.
  • the start of the actuation is the start of a movement on the output device.
  • the in particular mechanical energy provided by the drive device or the at least one drive actuator for example in the form of hydraulic energy, is stored in the in particular hydraulic energy store.
  • the hydraulic fluid is conveyed or moved into the first chamber area of the chamber by means of the drive actuator.
  • the piston element If the piston element is initially in the first position and the hydraulic fluid is conveyed to or into the first chamber area by means of the drive actuator, the piston element is thereby moved from the first position into the second position.
  • the piston element provides the first through-flow opening, which extends from the first chamber area at least indirectly to that for storage the hydraulic fluid formed energy storage leads freely.
  • the hydraulic fluid can flow from the first chamber area into the energy store.
  • the hydraulic fluid or the energy contained in the hydraulic fluid can thus be stored in the energy store, in particular by introducing the hydraulic fluid into the energy store.
  • the energy contained in the hydraulic fluid is generated, in particular, by applying a pressure to the hydraulic fluid, by means of which, in particular, mechanical work, in particular on the output device, can be brought about or performed.
  • the piston element can move from the second position to the first position can be moved. In the second position, the second through-flow opening is released and the first through-flow opening is blocked. By blocking the first through-flow opening, no hydraulic fluid can flow or flow back from the energy store into the first chamber area.
  • the hydraulic fluid can now flow from the energy store into the second chamber region through the released second through-flow opening, or the hydraulic fluid can be introduced or conveyed into it.
  • the hydraulic fluid introduced or conveyed into the second chamber area via the second through-flow opening or a part of this hydraulic fluid can be conveyed or conveyed further into the output device.
  • the output device can be supplied with at least part of the hydraulic fluid and can be driven by it, so that the storage actuator on the output device and thus can perform mechanical work on its output.
  • the storage actuator is particularly suitable for applications in which the tripping time plays a secondary role. Therefore, the storage phase or the storage state is not time-critical, whereby it can be guaranteed to a particularly large extent that the energy store can be filled with sufficient energy to provide the required power for the actuation state or the actuation itself.
  • the storage actuator according to the invention can provide a particularly large power or a comparatively small drive actuator can experience a particularly large increase in power, which in alternative actuator concepts would be associated with particularly high costs and / or can lead to a particularly large amount of installation space.
  • the memory actuator according to the invention can be designed such that it has a particularly high force density, which can represent a boundary condition for operating the memory actuator. The required power density cannot be provided by alternative actuator concepts either.
  • the force density can be selected particularly advantageously through the energy store of the storage actuator according to the invention.
  • the force density can be understood as the ratio of the volume of the output device that can be filled with hydraulic fluid in relation to the entire volume of the storage actuator, that is, a total of all components that can be filled with hydraulic fluid, such as the chamber and the energy store.
  • the storage unit of the actuator is implemented or designed in such a way that the power stored in it in the form of energy, in particular due to the storage position of the piston element, is not released during the storage of the energy provided by the drive device.
  • the energy store is sufficiently filled with hydraulic fluid, so that, for example, a predeterminable or desired and thus sufficient amount of energy is stored in the energy store, which is sufficient, for example, to actuate the output device, then, for example, the delivery of the hydraulic fluid to the or ended in the first chamber area.
  • the piston element releases, in particular automatically, the energy stored in the energy store, in particular in that the piston element is moved from the second position into the first position by means of the resetting device. The energy is thus released passively, that is to say without further action, for example by a user and / or the drive device of the storage actuator.
  • the storage actuator according to the invention can deliver particularly constant output parameters, in particular in terms of force and / or speed, during the actuation phase, in particular when a certain amount of energy is already contained in the energy storage device before the storage state preceding the actuation phase. That is, the storage actuator is filled with hydraulic fluid or with a corresponding amount of hydraulic fluid, so that during the storage process only enough volume of the hydraulic fluid has to be pumped into the energy store to ensure a required stroke ⁇ S of the output or the output device.
  • the amount of hydraulic fluid required or the volume of hydraulic fluid required ⁇ V depends on the Product of ⁇ S and an output cross section A of the output device.
  • the energy can advantageously be stored and only released when a sufficient amount is available. Another advantage is that the energy is released automatically and without a separate triggering unit, ie in a passive manner.
  • the actual drive actuator can provide little actual power to the drive device, which means that costs can be kept particularly low.
  • installation space can be saved by the storage actuator according to the invention.
  • a particularly high, realizable energy density can be generated with the storage actuator and this can be integrated particularly advantageously in possible application scenarios.
  • the storage actuator can be designed to be able to provide a particularly high mechanical power.
  • the drive actuator is designed as a solid-state actuator, in particular as a piezo actuator, and / or a polymer actuator.
  • the actuator concept of the drive device can be selected from a large number of actuator concepts.
  • Solid body and polymer actuators often have in common that they have a travel path or travel path which is particularly short, which means that certain applications cannot be implemented with these actuator concepts.
  • the travel range is limited by the maximum deformability of the piezo.
  • a piezo actuator can, for example, provide a particularly high force density for this purpose.
  • the storage actuator according to the invention can advantageously enlarge an application range of, for example, solid-state actuators, such as the piezo actuator.
  • a combination of force density and power can be designed particularly advantageously.
  • the memory actuator according to the invention can thus in particular be designed as a piezo-hydraulic storage actuator.
  • the storage actuator has a check valve which is arranged in the first throughflow opening and which blocks in the direction of the first chamber region.
  • the drive device has a drive chamber that can be supplied with the hydraulic fluid and a drive piston element that partially delimits the drive chamber and that can be driven by the drive actuator, by means of which the hydraulic fluid from the drive chamber into the first chamber area and via the first chamber area and the first flow opening is to be promoted in the energy store.
  • the drive piston element is driven by means of the drive actuator and thereby moved, at least part of the hydraulic fluid initially received in the drive chamber is conveyed out of the drive chamber by means of the drive piston element.
  • the drive device has a hydraulic cylinder which is at least partially formed by the drive chamber and the drive piston element and which functions as a so-called working cylinder.
  • the energy from the hydraulic fluid is converted into an effective force that is particularly easy to control or handle implemented, by means of which the energy store can be particularly advantageously filled with energy or hydraulic fluid.
  • the energy store can be particularly advantageously filled with energy or hydraulic fluid.
  • the drive piston element executes strokes caused by the drive actuator to convey the hydraulic fluid at a frequency of less than 10,000 Hertz, in particular less than 1000 Hertz.
  • This low frequency for a drive actuator, in particular designed as a piezo actuator enables, for example, particularly energy-efficient and low-wear operation of the piezo actuator and thus of the entire, in particular piezo-hydraulic, storage actuator.
  • the output device has an output chamber into which the hydraulic fluid can be introduced, and an output piston element which partially delimits the output chamber and which has an output surface that can be acted upon by the hydraulic fluid introduced into the output chamber.
  • the output piston element can be driven by subjecting the output surface of the output piston element to the hydraulic fluid introduced into the output chamber.
  • the output piston element and the output chamber at least partially form a hydraulic cylinder which particularly advantageously converts or uses the hydraulic fluid stored in the energy store to operate the actuator, whereby, for example, a desired output speed and / or a desired output force are provided by the storage actuator in a particularly advantageous manner can.
  • the output piston element has a hydraulically effective output surface which can be acted upon by the hydraulic fluid introduced into the output chamber.
  • the driven piston element can be driven and thus moved, in particular in a translatory manner. Due to the described design of the output device, for example, a particularly large amount of power can be made available at the output or the output piston element.
  • the restoring device has at least one spring which is tensioned more strongly in the second position than in the first position and thereby provides a spring force or restoring force at least in the second position, by means of which the piston element moves from the second position, the storage position , is movable into the first position, the actuating position.
  • the piston element is acted upon with hydraulic fluid in the first chamber part in such a way that the spring is tensioned in such a way, especially when the storage position is reached, that a restoring force prevails in the spring, which is particularly passive, i.e.
  • the piston element is moved into the actuating position, so that the second throughflow opening is opened, through which the hydraulic fluid can flow into the output device via the second chamber region.
  • the energy store is designed as a bellows pressure accumulator which has at least one storage chamber and at least one bellows arranged in the storage chamber, which can be elastically compressed by introducing the hydraulic fluid into the storage chamber.
  • the bellows By introducing hydraulic fluid into the energy store by means of the drive device, the bellows is compressed, in particular elastically, whereby energy can be stored in the memory.
  • the bellows compressed in the storage state relaxes so that the energy of the bellows is transferred to the hydraulic fluid in order to drive the output device.
  • the energy store which is thus designed as a so-called gas pressure store, can, for example, have an inner and an outer bellows, each of which is in particular at least partially formed from metal. Furthermore, the bellows can have a stop, in particular a mechanical stop, by means of which it is prevented that energy is already given off during the storage state.
  • a bellows pressure accumulator as an energy store, the storage actuator according to the invention can be designed, for example, to be particularly compact and / or particularly inexpensive.
  • Other types of hydraulic and / or gas pressure accumulators can additionally or alternatively be used as energy stores.
  • a second check valve is provided, via which the hydraulic fluid can be introduced from the drive device into the first chamber area.
  • a backflow of hydraulic fluid into the drive device can be prevented in a particularly advantageous manner by the second check valve, as a result of which the energy store can be charged particularly efficiently.
  • hydraulic fluid can additionally be introduced into the energy store instead of flowing back into the drive device.
  • a third check valve is provided, via which the output device can be supplied with the hydraulic fluid from the second chamber area.
  • a backflow of the hydraulic fluid from the output device, in particular from the output chamber, into the second chamber area is prevented or kept particularly low, which means that the output device can be actuated particularly efficiently and, when changing from the actuation position to the storage position, for example, prevents or prevents the output piston element from moving back can be kept particularly low.
  • the energy store can be at least predominantly, in particular completely, filled with the hydraulic fluid within a maximum of 10 seconds, in particular within a maximum of one second, during which the piston element is continuously in the second position or the storage position. That is, the energy store can be charged with the energy at least predominantly, in particular completely, during the storage state, in particular within a maximum of one second, in order to be able to operate the output device with the required power during the following actuation state.
  • a time interval that occurs between the switching on of the drive actuator for storing the energy and the actual switchover of the storage actuator to the actuation state can be understood as a so-called trigger time. This means that the trigger time of the memory actuator according to the invention is less than ten or one second and is therefore particularly short, which results in a particularly wide range of applications for using the memory actuator according to the invention.
  • a second aspect of the invention relates to a method for actuating an output device by means of a storage actuator, in which, in a first operating state of the storage actuator, at least one energy storage device is by means of a drive device of the storage actuator is supplied with energy, whereby the energy is stored in the energy store, wherein in a second operating state of the storage actuator the energy store provides at least part of the energy stored in the energy store, whereby the output device is supplied with the energy provided and thereby by means of the energy provided is operated.
  • the method according to the invention can advantageously be carried out in such a way that the stored energy is automatically released.
  • the energy can be held available or stored, that is to say a storage state or the storage state can be locked until, for example, the energy is released manually.
  • the energy can be stored up to a certain, in particular predeterminable, amount of energy. If this amount is reached, the output device can be driven automatically, for example.
  • the memory actuator according to the invention is operated by means of the method according to the invention or the method according to the invention is carried out on the memory actuator according to the invention.
  • Advantages and advantageous configurations of the first aspect of the invention are to be regarded as advantages and advantageous configurations of the second aspect of the invention and vice versa.
  • FIG 1 shows, in a schematic sectional view, a storage actuator 10 which has an output device 32.
  • the output device 32 represents an output of the storage actuator 10.
  • the storage actuator 10 is designed to operate the output device 32 and comprises at least one energy store 18 and a drive device 14, by means of which energy can be stored in the energy store 18 in at least one first operating state of the storage actuator 10.
  • the storage actuator 10 can have at least one second operating state in which at least part of the energy stored in the energy storage device 18 can be provided by the energy storage device 18, whereby the output device 32 can be supplied with the energy provided and can thereby be actuated.
  • the drive device 14 comprises a drive actuator 12.
  • the drive actuator 12 is advantageously designed as a piezo actuator, for example, alternatively, it can be designed as a different solid-state actuator and / or as a polymer actuator. In principle, any actuator concepts are possible as drive actuator 12.
  • a hydraulic fluid can be conveyed by means of the drive actuator 12 and thus by means of the drive device 14.
  • the storage actuator 10 further comprises a chamber 16 and the energy store 18.
  • a piston element 20 is arranged in the chamber 16 such that it can be moved in translation and divides the chamber 16 into a first chamber area 22 and a second chamber area 24.
  • the hydraulic fluid can be conveyed into the first chamber region 22 by means of the drive device 14.
  • At least one reservoir 38 in particular in the form of a tank, is provided to provide the hydraulic fluid, which in the first operating state can be conveyed into the energy store 18 by means of the drive device 14, whereby the energy can be stored in the energy store 18.
  • the energy store 18 can provide at least part of the hydraulic fluid stored in the energy store 18 and thereby at least part of the energy stored in the energy store 18, whereby the output device 32 can be actuated by means of the provided hydraulic fluid.
  • the piston element 20 By conveying the hydraulic fluid into the first chamber region 22, the piston element 20 can be moved from a first position, which is also referred to as the actuating position, into a second position, which is also referred to as the storage position.
  • the piston element is in the storage position in the first operating state and in the actuating position during the second operating state.
  • the first operating state is therefore referred to as the memory state and the second operating state as the actuating state.
  • the piston element 20 releases a first throughflow opening 26 of the accumulator actuator 10.
  • the piston element 10 blocks a second throughflow opening 28 of the storage actuator 10 in the second position, so that in the second position the hydraulic fluid conveyed into the first chamber area 22 can be introduced or flows from the first chamber area 22 via the first throughflow opening 26 into the energy store 18.
  • the storage actuator 10 has at least one resetting device 30, by means of which the piston element 20 can be moved from the second position into the first position, in which the piston element 20 releases the second throughflow opening 28 and blocks the first throughflow opening 26, so that at least part of the hydraulic fluid introduced into the energy store 18 can be introduced from the energy store 18 via the second through-flow opening 28 into the second chamber region 24.
  • the storage actuator 10 includes the output device 32, which can be supplied with at least part of the hydraulic fluid introduced into the second chamber region 24 and can thereby be driven.
  • the chamber 16 and a second chamber 34 of the storage actuator 10 connected to the chamber 16 in a fluidically conductive manner can be essentially cylindrical.
  • The, in particular hydraulic, storage actuator 10 is, while the piston element 20 is in the storage position, in a first phase (storage phase) or the first operating state, which is also referred to as the storage state.
  • the storage actuator 10 in particular its drive device 14, provides mechanical energy, which is stored in the energy store 18 by means of the hydraulic fluid.
  • the storage actuator 10 is in a second phase (actuation phase) or the second operating state, which is also referred to as the actuation state.
  • the output device 32 is actuated by means of the energy stored in the energy store 18 and thereby moved, for example, whereby an actuation can be effected by means of the output device 32.
  • the storage actuator 10 can be operated in such a way that the storage state or the storage of energy is not time-critical, that is, sufficient energy can be stored to provide the power required or required in the actuation state for the complete actuation phase.
  • the storage actuator 10 shown is of interest for applications in which, for example, an increase in the performance of an actuator would be associated with excessive costs and alternative actuator concepts compared to the Piezo actuator designed drive actuator 12, for example, can not achieve the desired force density.
  • the drive actuator 12 of the drive device 14 in the embodiment shown pumps the hydraulic fluid from the drive device 14 into the first chamber area 22 via a second check valve 36, so that the hydraulic fluid can be introduced into the first chamber area 22.
  • the drive device 14 in the exemplary embodiment shown has a drive chamber which can be supplied with the hydraulic fluid and a drive piston element which partially delimits the drive chamber and which can be driven by the drive actuator 12, by means of which the hydraulic fluid from the drive chamber into the first chamber area 24 by driving the drive piston element and is to be conveyed via the first chamber region 24 through the first flow opening 26 into the energy store 18.
  • the drive chamber and the drive piston element are shown in FIG FIG 1 Not shown.
  • the hydraulic fluid can be provided, for example, by the tank designed as a reservoir 38, which is located in the blocking direction on the same side of the second check valve 36 as the drive device 14.
  • a first check valve 40 which blocks in the direction of the first chamber region 24, is advantageously arranged in the first through-flow opening 26.
  • the hydraulic fluid is pumped or conveyed into the first chamber region 22 of the chamber 16 via the second check valve 36 and an opening 42 by means of the drive device 14. Due to the low compressibility of the hydraulic fluid, the piston element 20 is pressed against the restoring device 30, as a result of which the first throughflow opening 26 and thus the first check valve 40 are released.
  • the restoring device 30 advantageously has at least one spring 44.
  • the spring 44 is in the second position, i.e. in the storage position, tensed more than in the actuating position, as a result of which the spring 44 provides a spring force, at least in the storage position, by means of which the piston element 20 can be moved from the storage position into the actuation position.
  • the hydraulic fluid flows via the first check valve 40 at least indirectly into the energy store 18, which is connected to the first chamber area 22 via the chamber 34 and a further opening 46 in a fluidically conductive manner during the storage state.
  • the first check valve 40 prevents hydraulic fluid from flowing back from the second chamber 34 into the first chamber region 22. Due to the position of the piston element 20 in the storage position, the second throughflow opening 28 is blocked, in particular automatically, as a result of which no hydraulic fluid can flow out of the second chamber 34 and thus the energy storage device 18 into the second chamber region 24. If the hydraulic fluid is not conveyed by the drive device 14, the piston element 20 is moved translationally within the first chamber by the restoring force of the spring 44, so that the piston element 20 is shifted from the storage position into the actuating position, in particular translationally.
  • the piston element 20 is designed in such a way that leakage through the, in particular radial, gap between the piston element 20 and a wall of the chamber 16 is particularly small. That is to say, a fluidic exchange of the hydraulic fluid between the first chamber region 22 and the second chamber region 24 past the piston element 20 is particularly small, in particular negligible.
  • the in FIG 1 The energy store 18 shown is designed, for example, as a pneumatic and / or hydraulic store, that is, the more fluid or hydraulic fluid the drive actuator 12 pumps via the second check valve 36, the more energy is stored in the energy store 18.
  • the energy store 18 is already filled with sufficient hydraulic fluid or contains sufficient energy before the start of the storage state, so that only as much fluid volume ⁇ V has to be pumped into the energy store 18 or the second chamber 34 to ensure a required stroke ⁇ S of the output device 32 .
  • the pressure within the components of the, in particular hydraulic, storage actuator 10 to be filled with hydraulic fluid, such as in particular the energy store 18, should reach or apply a certain initial pressure, which is, for example, above an ambient pressure in the vicinity of the storage actuator 10.
  • the output device 32 has an output chamber 48 into which the hydraulic fluid can be introduced. Furthermore, the output device 32 has the output piston element 50 which partially delimits the output chamber 48 and which has an output surface 52 that can be acted upon by the hydraulic fluid introduced into the output chamber 48. By subjecting the output surface 52 to the hydraulic fluid introduced into the output chamber 48, the output piston element 50 can be driven.
  • the storage actuator 10 advantageously has a third check valve 54, via which the output device 32 can be supplied with the hydraulic fluid from the second chamber region 24. If the energy storage is ended, i.e. the drive actuator 12 stops conveying the hydraulic fluid via the check valve 36 into at least the first chamber region 22, the hydraulic fluid can then flow into the output device 32 after the piston element 20 has been reset by the reset device 30, whereby the output force and the output speed and thus the power, in particular at the output piston element 50, are provided. In this case, the, in particular translational, movement of the output piston element 50 takes place when the hydraulic fluid acts on the hydraulically effective output surface 52.
  • the drive piston element of the drive device 14, which executes the strokes caused by the drive actuator 12 to convey the hydraulic fluid can be moved back and forth at a frequency of less than 1000 Hertz, whereby the drive actuator 12 and thus the entire drive device 14, for example, are particularly wear-resistant and thus can be operated with little maintenance.
  • the storage state and thus the storage of energy advantageously take less than a second.
  • the piston element 20 is continuously in the second position, and the energy store 18 is at least predominantly, in particular completely, filled with the hydraulic fluid or can be filled with it during the period of time mentioned.
  • the period mentioned is also referred to as the trigger time, so that the trigger time of the memory actuator 10 can be less than one second.
  • the change between the storage state and the actuation state occurs passively, i.e.
  • FIG 2 shows a schematic sectional view of a further embodiment of the, in particular piezo-hydraulic, storage actuator 10, the second chamber 34 or the energy store 18 being designed as a bellows pressure accumulator which has at least one storage chamber, the second chamber 34, and at least one bellows 56 arranged in the storage chamber which is elastically compressible by introducing the hydraulic fluid into the storage chamber, the second chamber 34.
  • the FIG 2 shows only one half of the chambers of the memory actuator 10, since for reasons of symmetry, in particular due to a cylindrical design of the chamber 16 or 34 of the embodiment, no further information in FIG FIG 2 could be won.
  • the bellows pressure accumulator in FIG 2 an inner metal bellows 58 and an outer metal bellows 60, as a result of which, for example, a gas pressure accumulator or pressure accumulator which is particularly unsusceptible to malfunctions can be realized.
  • the embodiment shows a mechanical stop 62 of the bellows 56. This stop 62 can ensure that a certain amount of energy in the hydraulic fluid can already be held, so that only the fluid volume ⁇ V in the chamber region 22 or in the chamber 16 and thus in the energy store 18 must be introduced, which is required to ensure the required stroke ⁇ S on the output piston 50, the required volume being calculated over the area A of the output area 52 and the length ⁇ S of the stroke.
  • the mechanical stop 62 serves to prevent the already stored energy from being released during the storage state.
  • hydraulic fluid can be applied to the stop 62 in such a way that the bellows 56 can be compressed or is compressed by the application of the action.
  • the first check valve 40 is introduced into the chamber 34 and thus into the energy store 18, it elastically deforms the bellows 56 there, whereby energy can be stored by means of the hydraulic fluid by compressing the bellows 56.
  • piezo-hydraulic, storage actuator 10 in which the energy store 18 is combined with the drive device 14 and the output device 32 in such a way that the storage actuator 10 can be operated by means of two phases, the storage phase and the actuation phase, a lot of power can be generated which the drive actuator 12 itself cannot provide, which opens up a wide range of possibilities for using the memory actuator 10.

Landscapes

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

Claims (12)

  1. Actionneur à accumulateur (10) destiné à actionner un dispositif de sortie (32) et comprenant le dispositif de sortie (32), au moins un accumulateur d'énergie (18), un dispositif d'entraînement (14) permettant d'emmagasiner, dans au moins un premier état de fonctionnement de l'actionneur à accumulateur (10), de l'énergie dans l'accumulateur d'énergie (18), l'actionneur à accumulateur (10) présentant au moins un deuxième état de fonctionnement dans lequel au moins une partie de l'énergie emmagasinée dans l'accumulateur d'énergie (18) peut être fournie par l'accumulateur d'énergie (18), de façon à ce que le dispositif de sortie (32) puisse être alimenté avec l'énergie fournie et ainsi être actionné, au moins un réservoir (38) étant prévu pour fournir un fluide hydraulique qui, dans le premier état de fonctionnement, peut être acheminé jusque dans l'accumulateur d'énergie (18) au moyen du dispositif d'entraînement (14) de façon à ce que l'énergie puisse être emmagasinée dans l'accumulateur d'énergie (18), et l'accumulateur d'énergie (18) fournissant, dans le deuxième état de fonctionnement, au moins une partie du fluide hydraulique emmagasiné dans l'accumulateur d'énergie (18) et ainsi au moins la partie de l'énergie emmagasinée dans l'accumulateur d'énergie (18) de façon à ce que le dispositif de sortie (32) puisse être actionné au moyen du fluide hydraulique fourni,
    l'actionneur à accumulateur comportant en outre :
    - le dispositif d'entraînement (14) comprenant au moins un actionneur d'entraînement (12) et destiné à acheminer le fluide hydraulique ;
    - une chambre (16) ;
    - un élément formant piston (20) qui est disposé de manière mobile dans la chambre (16) et qui divise la chambre (16) en une première zone de chambre (22), dans laquelle le fluide hydraulique peut être acheminé au moyen du dispositif d'entraînement (14), et une deuxième zone de chambre (24) et qui peut être déplacé, par l'acheminement du fluide hydraulique jusque dans la première zone de chambre (22), d'une première position à une deuxième position dans laquelle l'élément formant piston (20) libère une première ouverture de passage d'écoulement (26) et bloque une deuxième ouverture de passage d'écoulement (28) de sorte que le fluide hydraulique acheminé jusque dans la première zone de chambre (22) puisse être introduit dans l'accumulateur d'énergie (18) depuis la première zone de chambre (22) par la première ouverture de passage d'écoulement (26) ;
    - au moins un dispositif de rappel (30), qui permet de déplacer l'élément formant piston (20) de la deuxième position à la première position dans laquelle l'élément formant piston (20) libère la deuxième ouverture de passage d'écoulement (28) et bloque la première ouverture de passage d'écoulement (26) de sorte qu'au moins une partie du fluide hydraulique introduit dans l'accumulateur d'énergie (18) puisse être introduite de l'accumulateur d'énergie (18) jusque dans la deuxième zone de chambre (24) par la deuxième ouverture de passage d'écoulement (28) ; et
    - le dispositif de sortie (32) qui peut être alimenté avec au moins une partie du fluide hydraulique introduit dans la deuxième zone de chambre (24) et peut ainsi entraîné.
  2. Actionneur à accumulateur (10) selon la revendication 1, l'actionneur d'entraînement (12) étant conçu comme un actionneur à semi-conducteurs, en particulier comme un piézo-actionneur, et/ou un actionneur à polymère.
  3. Actionneur à accumulateur (10) selon la revendication 1 ou 2, une première soupape anti-retour (40), qui est bloquée en direction de la première zone de chambre (22), étant disposée dans la première ouverture de passage d'écoulement (26).
  4. Actionneur à accumulateur (10) selon les revendications 1 à 3, le dispositif d'entraînement (14) comportant une chambre d'entraînement qui peut être alimentée avec le fluide hydraulique et un élément formant piston d'entraînement qui délimite partiellement la chambre d'entraînement, qui peut être entraîné par l'actionneur d'entraînement (12) et qui permet d'acheminer, par entraînement de l'élément formant piston d'entraînement, le fluide hydraulique de la chambre d'entraînement jusque dans la première zone de chambre (22) et, par la première zone de chambre (22) et la première ouverture de passage d'écoulement (26), jusque dans l'accumulateur d'énergie (18).
  5. Actionneur à accumulateur (10) selon la revendication 4, l'élément formant piston d'entraînement effectuant des courses, provoquées par l'actionneur d'entraînement (12) et destinées à acheminer le fluide hydraulique, à une fréquence inférieure à 10000 Hertz, en particulier inférieure à 1000 Hertz.
  6. Actionneur à accumulateur (10) selon les revendications 1 à 5, le dispositif de sortie (32) comportant une chambre de sortie (48), dans laquelle le fluide hydraulique peut être introduit, et un élément formant piston de sortie (50) qui délimite partiellement la chambre de sortie (48), qui comporte une surface de sortie (52) sur laquelle le fluide hydraulique, introduit dans la chambre de sortie (48), peut agir et qui peut être entraîné par action du fluide hydraulique, introduit dans la chambre de sortie (48), sur la surface de sortie (52) .
  7. Actionneur à accumulateur (10) selon les revendications 1 à 6, le dispositif de rappel (30) comportant au moins un ressort (44) qui est plus fortement tendu dans la deuxième position que dans la première position et qui fournit ainsi, au moins dans la deuxième position, une force de ressort qui permet de déplacer l'élément formant piston (20) de la deuxième position à la première position.
  8. Actionneur à accumulateur (10) selon les revendications 1 à 7, l'accumulateur d'énergie (18) étant conçu comme un accumulateur de pression à soufflet qui comporte au moins une chambre d'accumulation (34) et au moins un soufflet (56) qui est disposé dans la chambre d'accumulation (34) et qui peut être comprimé élastiquement par introduction du fluide hydraulique dans la chambre d'accumulation (34).
  9. Actionneur à accumulateur (10) selon les revendications 1 à 8, une deuxième soupape anti-retour (36) étant prévue qui permet d'introduire le fluide hydraulique du dispositif d'entraînement (14) dans la première zone de chambre (22).
  10. Actionneur à accumulateur (10) selon les revendications 1 à 9, une troisième soupape anti-retour (54) étant prévue qui permet d'alimenter le dispositif de sortie (32) avec le fluide hydraulique provenant de la deuxième zone de chambre (24).
  11. Actionneur à accumulateur (10) selon les revendications 1 à 10, l'accumulateur d'énergie (18) pouvant être rempli au moins essentiellement, en particulier complètement, avec le fluide hydraulique pendant une durée de 10 secondes maximum, en particulier d'une seconde maximum, pendant laquelle l'élément formant piston (20) est constamment dans la deuxième position.
  12. Procédé d'actionnement d'un dispositif de sortie (32) au moyen d'un actionneur à accumulateur (10) selon l'une des revendications précédentes, procédé dans lequel, dans un premier état de fonctionnement de l'actionneur à accumulateur (10), au moins un accumulateur d'énergie (18) est alimenté en énergie au moyen d'un dispositif d'entraînement (14) de l'actionneur à accumulateur (10), l'énergie étant emmagasinée dans l'accumulateur d'énergie (18), l'accumulateur d'énergie (18) fournissant, dans un deuxième état de fonctionnement de l'actionneur à accumulateur (10), au moins une partie de l'énergie emmagasinée dans l'accumulateur d'énergie (18) de façon à ce que le dispositif de sortie (32) soit alimenté avec l'énergie fournie et ainsi actionné au moyen de l'énergie fournie.
EP18160844.9A 2018-03-09 2018-03-09 Actionneur avec accumulateur Active EP3536976B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18160844.9A EP3536976B1 (fr) 2018-03-09 2018-03-09 Actionneur avec accumulateur
DK18160844.9T DK3536976T3 (da) 2018-03-09 2018-03-09 Lageraktuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18160844.9A EP3536976B1 (fr) 2018-03-09 2018-03-09 Actionneur avec accumulateur

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EP3536976B1 true EP3536976B1 (fr) 2020-11-11

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KR20220137752A (ko) * 2020-02-14 2022-10-12 메티스모션 게엠베하 액추에이터 장치 및 이러한 액추에이터 장치를 작동시키기 위한 방법

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US6070408A (en) * 1997-11-25 2000-06-06 Caterpillar Inc. Hydraulic apparatus with improved accumulator for reduced pressure pulsation and method of operating the same
GB201500553D0 (en) * 2015-01-14 2015-02-25 Bae Systems Plc Hydraulic Actuators
US10247204B2 (en) * 2016-04-01 2019-04-02 Yamada Manufacturing Co., Ltd. Hydraulic control apparatus and hydraulic control method

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DK3536976T3 (da) 2021-01-25

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