EP3834280A1 - Entraînement piézoélectrique, en particulier en tant qu'élément de réglage automatique pour un composant de véhicule - Google Patents

Entraînement piézoélectrique, en particulier en tant qu'élément de réglage automatique pour un composant de véhicule

Info

Publication number
EP3834280A1
EP3834280A1 EP19755296.1A EP19755296A EP3834280A1 EP 3834280 A1 EP3834280 A1 EP 3834280A1 EP 19755296 A EP19755296 A EP 19755296A EP 3834280 A1 EP3834280 A1 EP 3834280A1
Authority
EP
European Patent Office
Prior art keywords
piezo actuator
bracket
piezo
receiving
legs
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Withdrawn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
EP19755296.1A
Other languages
German (de)
English (en)
Inventor
Stefan Kirsch
Volker Dicke
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.)
Behr Hella Thermocontrol GmbH
Original Assignee
Behr Hella Thermocontrol 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 Behr Hella Thermocontrol GmbH filed Critical Behr Hella Thermocontrol GmbH
Publication of EP3834280A1 publication Critical patent/EP3834280A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H02N2/04—Constructional details
    • H02N2/043—Mechanical transmission means, e.g. for stroke amplification
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H10N30/206—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using only longitudinal or thickness displacement, e.g. d33 or d31 type devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user

Definitions

  • Piezo drive especially as an automatic actuator
  • the invention relates to a piezo drive which is to be used in particular as an automatic actuator for a vehicle component and which is used in particular to generate haptic feedback in an operating device.
  • Piezo drives are used for a wide variety of applications. In this case, the variability in length of a piezoelectric element in one direction of action is used in the case of electrical control in order to mechanically excite a component or unit to be moved.
  • One application in the automotive industry is the use of a piezo drive to generate haptic feedback on an operating device.
  • Such an operating device has a touch screen or a touch pad which is mechanically excited briefly or in a pulse-like manner if valid manual operation has been detected.
  • the invention relates to a piezo actuator with a gear, which is also referred to in specialist circles as a piezo actuator with mechanical reinforcement.
  • piezo actuators which have a multiplicity of stacked piezoelectric elements (hereinafter referred to as piezo elements).
  • piezo elements Such a piezo actuator acts mechanically on a movement conversion construction or a corresponding conversion gear, by means of which a slight change in length of the piezo actuator in the effective direction, which takes place with a comparatively high force, is converted into a larger movement with a correspondingly lower force.
  • piezo drives with conversion gears are described in DE-U-20 2008 017 833, US-B-6 246 132, US-A-4 952 835, WO-A-2017/1762019, US-B-9 523 294, EP- A-3 056 977, WO-A-2014/164018, WO-A-2016/067831, US-B-6 465 936, WO-A-2014/096565, US-A-2016/0 027 263, DE- A-10 2016 116 763, JP-A-2008-287402, EP-A-1 035 015, DE-B-23 05 277, DE-C-42 14 220 and DE-B-199 81 030.
  • Adhesive techniques are usually used to connect the piezo actuator to the implementation design. These involve a lot of effort in mass production.
  • the object of the invention is to provide a piezo drive with a piezo actuator with mechanical reinforcement which is improved in terms of its manufacture and susceptibility to errors.
  • the invention provides a piezo drive, in particular as an automatic actuator for a vehicle component, e.g. for the generation of haptic feedback in operating devices, the piezo drive being provided with
  • a piezo actuator made of a piezoelectric material, the piezo actuator having a longitudinal extension between two ends with opposite end faces, which defines a direction of action of the piezo actuator along which the piezo actuator expands and contracts, a conversion gear coupled to the piezo actuator for converting one expansion in the effective direction of the piezo actuator and a subsequent contraction of the piezo actuator in each case in a movement directed at an angle of not equal to 0 degrees, in particular of 90 degrees, to the longitudinal extent of the piezo actuator,
  • the conversion gear has an elastic bracket and / or a bracket with an elastic material, the two opposite and spaced receiving legs and one between these extending connecting legs with at least one portion directed away from the piezo actuator in relation to the position or curved in the direction of this, and wherein the piezo actuator is received at both ends of the receiving legs so that it rests against the adhesive and the connecting leg of the bracket is arranged on the side of the piezo actuator.
  • the piezo actuator of the drive according to the invention can be reversibly expanded with regard to its direction of action and has two ends facing away from one another and between them one or a plurality of piezo elements stacked one on top of the other.
  • the piezo actuator expands in its effective direction through electrical control of the piezo element (s). If the control voltage is deactivated, the piezo actuator contracts again because of its elasticity.
  • the use of ceramics has established itself as a piezoelectric material. However, it is also possible to use printable piezoelectric polymers, which are still being researched on.
  • a (movement) conversion gear is coupled to the piezo actuator, which converts an expansion and a subsequent contraction of the piezo actuator into (opposing) movements, which are preferably 90 ° to the longitudinal extension of the piezo actuator and thus at right angles to the direction in which the piezo actuator is changed in length, implemented. Constructions other than 90 ° between the direction of the length change and the direction of movement of the conversion gear, ie angles between 90 ° and 0 °, are also possible.
  • a bracket that is designed to be elastic acts as the conversion gear. The elasticity of the bracket can be realized either constructively or by choosing the material. The bracket extends at least within a section along the piezo actuator at a distance that changes from this.
  • the bracket has two opposite and spaced-apart receiving legs, between which a connecting leg of the bracket extends. So essentially the bracket is in Side view viewed U-shaped. Within its connecting leg there is the previously mentioned section in which the distance of the connecting leg to a longitudinal axis running between the receiving legs of the bracket changes, starting from a first distance value (distance to the longitudinal axis of the piezo actuator) enlarged or alternatively reduced.
  • the piezo actuator is held clamped between the receiving legs of the bracket of the conversion gear.
  • the piezo actuator bears at its two ends on the receiving legs or is received by these, so that the connecting leg of the bracket extends essentially to the side next to the piezo actuator, with the distance to the latter changing in particular in the aforementioned section , If the piezo actuator now expands in the direction of action when electrically actuated, the elastic yoke stretches, so that the distance of the said (distance change) section from the piezo actuator changes. This change is then used to identify an element, component or unit or the like. to move.
  • the shape of the (distance-changing) section of the connecting leg of the bracket between its receiving legs (which may optionally have receiving elements) surrounding the ends of the piezo actuator determines the size of the movement stroke (and the orientation of the movement) that the connecting section undergoes and the size the ratio of the linear expansion of the piezo actuator and the movement stroke.
  • a role in which angles regions of the (distance change) section run relative to the longitudinal axis of the piezo actuator e.g. trapezoidal or U-shaped or circular arc-shaped course of the section).
  • the piezo actuator is not adhesively connected to the receiving legs. Rather, the piezo actuator is preferably received in an essentially form-fitting manner by the receiving legs and bears against these, without being adhesively connected to them. This applies to the front of the Piezo actuator. If necessary, the portions of the circumferential surface of the piezo actuator adjoining the end faces also rest on the receiving legs of the bracket or brackets. This system is also glue-free.
  • the receiving legs can have receiving elements that have a corresponding receiving recess into which the ends of the piezo actuator are immersed.
  • the piezo actuator is protected from tensile forces, to which piezoceramic material generally reacts very sensitively. If the piezo actuator used in accordance with the invention were to unintentionally contract from the non-electrically actuated rest position, this is possible without risk in the invention, since there is no firm connection between the piezo actuator and the receiving legs of the bracket consists. In addition, there is protection against external misuse forces, which cannot lead to the piezo actuator and the piezo elements being pulled apart.
  • the conversion gear has a further connecting leg, which is opposite the other connecting leg of the bracket and is also curved, whereby the two connecting legs are essentially symmetrical to each other.
  • the further connecting leg has at least one section along its extent between the receiving legs, in which the distance of the further connecting leg along its extent between the receiving legs to the longitudinal axis running between the receiving legs initially starts from to a third distance value enlarged to a fourth distance value - or alternatively reduced.
  • the conversion gear has two connecting legs arranged on opposite lateral sides of the piezo actuator, each of which has a distance that changes with respect to the piezo actuator within at least one section to the piezo actuator.
  • the conversion gear thus has a (frame) bracket running around the piezo actuator, in which the piezo actuator is arranged, with its ends resting on the frame, namely on the receiving legs of the bracket.
  • the conversion gear can have receiving elements which are fitted into or received by the receiving legs.
  • the receiving legs themselves can also be designed as receiving elements, for example, encompassing the ends of the piezo actuator on all sides.
  • the two connecting legs of the bracket of the conversion gear according to the aforementioned development of the invention can run symmetrically to one another, the central longitudinal axis of the piezo actuator forming the axis of symmetry in this case, or also not running symmetrically.
  • the direction and the movement stroke are defined in which the movement of the change in length of the piezo actuator is implemented.
  • the bracket is oval, lenticular or elliptical in shape, the receiving legs being arranged at the ends of the longer axis of the oval or the lens or ellipse and which are spaced apart
  • To the longitudinal axis changing sections of the connecting legs define the smaller axis of the oval, lenticular or elliptical bracket.
  • a major axis and a minor axis can be defined for an ellipse or lens or for an oval.
  • the main axis is the longer of the two diameters defined by the oval, lens or ellipse shape.
  • the piezo actuator either extends along the main axis or the minor axis of the ellipse or oval shape.
  • the spacing change sections of the two brackets then lie along the minor axis or along the main axis.
  • the receiving limbs of the bracket preferably enclose the ends of the piezo actuator on at least two sides facing away from one another and in particular on all sides.
  • the two receiving legs of the bracket can have receiving elements, in the receiving recesses of which the ends of the piezo actuator are immersed.
  • These receiving elements are expediently by means of mechanical fastening elements such as screws, pins, rivets or the like. connected to the receiving legs of the bracket.
  • the conversion gear is made from a stamped, cut or lasered metal.
  • the bracket is designed as a metal strip element which has two ends facing away from one another and which, when viewed from the side, is bent in a C-shape, where, in the case of a central section lying in the longitudinal extension of the metal strip element, the one receiving leg of the bracket and the two ends of the metal strip element form the second receiving leg of the bracket or a receiving element forming the receiving leg of the bracket is arranged between these two ends of the metal strip element.
  • Two opposite tabs can be arranged to the side of the central section, which, when angled in the same direction, together with the central section form a receptacle which rests on all sides at one end of the piezo actuator.
  • Such tabs can also be provided on one of the ends of the metal strip element, where, after being bent in the same direction, they form a receptacle on the other receptacle leg of the bracket for the other end of the piezo actuator together with at least one of the two ends.
  • the piezo actuator should be held clamped in the conversion gear or in the bracket in order to stretch the bracket even with the slightest changes in length.
  • the bracket has a tensioning element which is arranged on one of the two receiving legs and can be positioned in the direction of the course of the connecting axis and to define its abutment on the end face of one of the ends of the piezo actuator and the pressing force applied to the piezo actuator is fixable in position on the receiving leg.
  • This tensioning element is advantageously an entry screw, the threaded shaft end of which acts on one of the front ends of the piezo actuator or acts on a receiving element receiving this end in order to move it towards the piezo actuator / to press.
  • the conversion gear can have a correspondingly curved oval, lens or elliptical metal strip.
  • the metal strip is bent over in relation to its central section. This central section then forms a receptacle for one end of the piezo actuator.
  • the free ends of the metal strip element are bent over to form a second receptacle for the other end of the piezo actuator.
  • These two ends of the metal strip element can be connected to one another or held together with the aid of a screw. In an advantageous embodiment of the invention, this screw can then also perform the function of the previously described adjusting screw for applying a pretension to the piezo actuator.
  • FIGS. 2 to 5 show a schematic representation of a vehicle operating unit from the front with a touch pad or touch screen, which is stimulated by a piezo drive in order to generate haptic feedback and thus for tactile feedback of a manual touch input, FIGS. 2 to 5
  • FIG. 1 Various representations of the components of a first exemplary embodiment of a piezo drive and which can be used in the operating unit according to FIG. 1
  • FIG. 1 Various representations of components of a second exemplary embodiment of a piezo drive, which can be used in the operating unit according to FIG. 1.
  • FIG. 1 shows a front view of an operating unit 10 for a vehicle, in which the operating element 12 is designed as a touch screen or touch pad, on which a valid input of an operating command is tactilely reported back by a pulse-like mechanical excitation (haptic feedback) ,
  • the control unit 10 has a piezo drive 14 which e.g. is arranged and effective between the housing wall 17 of the housing 16 of the operating unit 10 and its operating element 12.
  • the control unit 10 can, for example, also have other control elements such as keys 18 and / or a turntable 20.
  • FIGS. 2 to 5 A first exemplary embodiment for the piezo drive 14 is shown in FIGS. 2 to 5 shown.
  • the piezo drive 14 is provided with a piezo actuator 22, which has a stack of individual piezo elements 24. The electrical contacting of these piezo elements 24 is not shown in the figures for the sake of clarity.
  • the piezo drive 14 also has a metal bracket 26, which in this exemplary embodiment is provided with two receiving legs 28, 30, of which the ends 32, 34 of the piezo actuator 22 are received with their end faces 33, 35 facing away from one another.
  • the other receiving leg 30 is as one formed further receiving element 40, which also has a receiving recess 42 for the other end 34 of the piezo actuator 22. Both receiving elements 36, 40 are fastened to the bracket 26 by means of screws 44.
  • two connecting legs 46, 48 extend between the receiving legs 28, 30 of the bracket 26, of which the connecting leg 46 is arranged on one lateral side of the piezo actuator 22, while the other connecting leg 48 is located on the aforementioned one the first connecting leg 46 is arranged opposite on the opposite lateral side of the piezo actuator 22.
  • the special feature of the two connecting legs 46, 48 is that each has a connecting section 50 or 52, within which the distance between the respective connecting leg 46 and the piezo actuator 22 changes, in this exemplary embodiment increased and reduced from there again , Each connection section 50 thus has, as it were, an apex region 54, 56 which is the furthest away from the piezo actuator.
  • the two connecting legs 46, 48 thus extend in relation to the piezo actuator 22 as viewed from this, but could also be curved in the opposite direction. It is also possible for one connecting leg to be convex, that is to say directed away from the piezo actuator 22, while the other connecting leg is to be concave, that is to say in the direction of the piezo actuator 22.
  • the bracket 26, as indicated in FIG. 1 is fastened on the one hand to the operating element 12 and on the other hand to the housing 16.
  • the housing 16 e.g. Screws 57.
  • the piezo actuator 22 When an electrical voltage is applied to the piezo actuator 22, the latter extends in the longitudinal direction, that is to say in the direction of the axis 58. As a result, the sections 50, 52 of the connecting legs 46, 48 move in the direction of the piezo actuator 22. In this way, based on the application according to FIG. 1, the operating element 12 would be moved in the direction of the arrow 60, and then, when there was no more voltage at the piezo actuator 22, itself to move back again, specifically in the direction of arrow 62. During this process, the piezo actuator 22 initially expands and contracts the connecting legs 46, 48 (see arrows 64 and 65 in FIG. 1), in order then to stop fitting Contract tension. The bracket 26 with the connecting legs 46, 48 thus forms a motion conversion gear 70.
  • the advantage of the construction of the piezo drive 14 according to the invention is that the piezo actuator 22 rests on its two ends 32, 34 in the receiving recesses 38, 42 on the receiving elements 36, 40 without being glued there.
  • the ends 32, 34 of the piezo actuator 22 should contact the bottoms of the receiving recesses 38, 42 when the piezo actuator 22 is not electrically excited, or the piezo actuator 22 should be held clamped in the bracket 26 in its rest position.
  • a clamping element 66 is used, which in this exemplary embodiment has the form of a clamping screw 68, which, for example, as shown in FIG. 4, has the shaft end 71 at one of the ends (in this exemplary embodiment, at the end 32) of the piezo actuator 22 is applied.
  • this bracket 26 is designed as a metal strip element 72, the central section 74 of which, viewed in the longitudinal direction, forms the first receiving leg 28. Sections 76, 78 for the two connecting legs 46, 48 are located on both sides of this middle section 74. Within these two sections 76, 78 there is also the area for the apex area 54, 56. according to FIGS. 4 and 5 is the possibility of producing the bracket as a metal stamped part. No casting or milling processes are therefore required to produce the bracket 26.
  • the bracket 26 has essentially the shape of an ellipse or an oval.
  • the extension leg 46 extends from a first distance value (see at 80 in FIG. 5 the distance of the connection section 50 from the piezo actuator 22) to a larger second distance value (see at 82 in FIG. 5) Distance of the apex region 54 from the piezo actuator 22), which lies in the region of the apex regions 54, 56 of the connecting leg in question, in order to then again from there to a reduced further distance value (see also the distance in FIG. 5 at 84 this embodiment is equal to the distance value at 80), which can be, for example, equal to the first distance value.
  • the distance of the connecting leg 48 at the beginning of the connecting section 52 can be the same or different from the distance value 80 of the connecting section 50.
  • the (fourth) distance value 83 in the vertex region 56 may be the same or different from the distance 82.
  • the distance value 85 of the connection section 52 can be different from the distance value 84 of the connection section 50.
  • FIGS. 6 to 8 a second exemplary embodiment of a piezo drive 14 'according to the invention is shown.
  • the individual parts of this piezo drive 14 ' have the same construction or function as the elements of the piezo drive 14 of FIGS. 2 to 5, they are shown in FIGS. 6 to 8 with the same reference numerals as in FIGS. 2 to 5 marked.
  • the piezo drive 14 '. 6 to 8 of the bracket 26 is designed as a bent metal strip element 72.
  • the receiving legs are provided with separate receiving elements 36, 40, are in the embodiment of FIGS. 6 to 8 these receiving elements 36, 40 by means of individual bendable tabs of the metal strip fenelements 72 formed.
  • the metal strip element 72 has two laterally arranged bending tabs 86 in the central section 74. Two further bending lugs 88 are formed on one of the two ends 90, 92 of the metal strip element 72. At both ends 90, 92 there are further bending tabs 94, which are smaller in this exemplary embodiment, as shown in FIG. 7.
  • FIG. 8 How the individual bending tabs are shaped in this case is shown in FIG. 8.
  • the two ends 90, 92 of the metal strip element 72 are furthermore each provided with a hole 96. In the bent state, these two holes 96 are aligned in that the two ends 90, 92 of the metal strip element lie one above the other, as shown in FIG. 8.
  • a tensioning screw 68 extends through the holes 96 aligned with one another as tensioning element 66, which e.g. is in threaded engagement with a screw nut (not shown) lying against the inside of the receiving leg 30 or element with an internal threaded bore for the clamping screw 68.
  • stirrups or metal strips on the bending lines are provided with embossments or beads and can therefore be designed like film hinges ,

Landscapes

  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'entraînement piézoélectrique est équipé d'un actionneur piézoélectrique (22) extensible de manière réversible par rapport à sa direction longitudinale, qui comprend deux extrémités opposées (32, 34) ainsi que deux côtés latéraux en regard l'un de l'autre. Un organe de conversion (70) est couplé à l'actionneur piézoélectrique (22) pour la conversion d'une extension et d'une contraction subséquente de l'actionneur piézoélectrique (22) respectivement en un mouvement orienté selon un angle différent de 0 degré, en particulier de 90 degrés pour la direction longitudinale de l'actionneur piézoélectrique (22). L'organe de conversion (70) comprend un étrier élastique (26) qui comprend deux branches de réception (28, 30) opposées et écartées l'une de l'autre et une branche de liaison (46, 48) s'étendant entre celles-ci avec au moins un secteur (50, 52) orienté, par rapport à la position de l'actionneur piézoélectrique (22), éloigné de celui-ci ou cintré en direction de celui-ci. L'actionneur piézoélectrique (22) est reçu au niveau de ses deux extrémités (32, 34) par les branches de réception (28, 30) et reposant contre ces dernières et la branche de liaison (46, 48) de l'étrier (26) est disposée latéralement à un des deux côtés latéraux de l'actionneur piézoélectrique (22).
EP19755296.1A 2018-08-06 2019-07-31 Entraînement piézoélectrique, en particulier en tant qu'élément de réglage automatique pour un composant de véhicule Withdrawn EP3834280A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018119063 2018-08-06
PCT/EP2019/070684 WO2020030507A1 (fr) 2018-08-06 2019-07-31 Entraînement piézoélectrique, en particulier en tant qu'élément de réglage automatique pour un composant de véhicule

Publications (1)

Publication Number Publication Date
EP3834280A1 true EP3834280A1 (fr) 2021-06-16

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Family Applications (1)

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EP19755296.1A Withdrawn EP3834280A1 (fr) 2018-08-06 2019-07-31 Entraînement piézoélectrique, en particulier en tant qu'élément de réglage automatique pour un composant de véhicule

Country Status (6)

Country Link
US (1) US20210296563A1 (fr)
EP (1) EP3834280A1 (fr)
JP (1) JP2021533720A (fr)
KR (1) KR20210040384A (fr)
CN (1) CN112602263A (fr)
WO (1) WO2020030507A1 (fr)

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WO2020030507A1 (fr) 2020-02-13
CN112602263A (zh) 2021-04-02
KR20210040384A (ko) 2021-04-13
JP2021533720A (ja) 2021-12-02
US20210296563A1 (en) 2021-09-23

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