EP0564794B1 - Double acting electromagnetic actuator - Google Patents

Double acting electromagnetic actuator Download PDF

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Publication number
EP0564794B1
EP0564794B1 EP93102605A EP93102605A EP0564794B1 EP 0564794 B1 EP0564794 B1 EP 0564794B1 EP 93102605 A EP93102605 A EP 93102605A EP 93102605 A EP93102605 A EP 93102605A EP 0564794 B1 EP0564794 B1 EP 0564794B1
Authority
EP
European Patent Office
Prior art keywords
double
armature
tube
solenoid actuator
actuator according
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.)
Expired - Lifetime
Application number
EP93102605A
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German (de)
French (fr)
Other versions
EP0564794A1 (en
Inventor
Hermann Sanzenbacher
Roland Schempp
Berthold Dipl.-Ing. Pfuhl (Fh)
Volkmar Dipl.-Ing. Leutner
Friedhelm Dr. Dipl.-Ing. Zehner
Frank Dipl.-Ing. Simon
Joachim Dipl.-Ing. Zumbraegel
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0564794A1 publication Critical patent/EP0564794A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1684—Armature position measurement using coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1692—Electromagnets or actuators with two coils

Definitions

  • the invention relates to an electromechanical double-stroke magnet according to the type specified in the preamble of claim 1.
  • Such an electromechanical double-stroke magnet is already known from the publication WO 91/05957, the double-stroke magnet, which is designed in a wet design, being used to control a multi-way control valve.
  • the proportional double-stroke magnet has two electromagnetic coils, each of which is supplied with a bias current in the rest position of the armature, which is approximately half the maximum current.
  • This double solenoid therefore achieves a high level of dynamics and manages with a low control current. It does not require polarized permanent magnets and can also generate pulling and pushing forces.
  • a disadvantage of this double-stroke magnet is that, with its wet construction, the sealing of several components must be carried out and is therefore difficult.
  • the proportional double-stroke magnet has relatively complex pole pieces with complex ring geometries, which lead to an expensive construction. Furthermore, no displacement transducer system is provided on the double-stroke magnet, so that it is used for position control loops is not immediately usable. Furthermore, the double-stroke magnet has a relatively long construction, its axial length almost corresponding to twice the diameter of the coils. In many applications, such long magnets cannot be used.
  • a proportional magnet for the electrical control of hydraulic valves is known from the document EP 0 278 227 A3, which in addition to a pressure tube construction also has an integrated displacement measuring system.
  • This proportional magnet is a single-acting design with a single coil, in which no pulling and pushing forces can be generated. The dynamics of such single-acting proportional magnets are therefore not sufficient in certain applications, although this design also requires higher control currents.
  • this proportional magnet is too long in the axial direction for some applications, since its displacement sensor system is arranged relatively far away from the electromagnetic coil. Due to the asymmetrical force relationships in the single-acting magnet, the design of a position control is also made more difficult.
  • a highly dynamic proportional magnet for valve control which has a pressure tube construction and an integrated position measuring system.
  • two electromagnetic coils are arranged one above the other and can be controlled in the same or opposite directions, so that the actuating force can be varied from zero to a maximum value.
  • This proportional magnet is designed as a single stroke magnet and has a mounting point for a pickup tube in the armature tube, which is located at a relatively large distance from the coil and thus results in a long single stroke magnet.
  • the electromechanical double-stroke magnet according to the invention with the characterizing features of the main claim has the advantage that, while maintaining its special properties such as high dynamics, low control current and symmetrical force ratios, it enables a cost-effective and particularly compact design in the axial direction.
  • the use of a pressure pipe makes it easier to master the problems associated with sealing and integrating a measuring system.
  • relatively simple magnetic pole shapes can be used in the pressure pipe, and a favorable course of the force-displacement characteristic curves can be achieved in connection with different armature pole ring covers. It is advantageous that
  • the magnetic flux is conducted essentially over radial air gaps.
  • a short armature design i.e. realize its length in relation to the diameter, whereby its anchor mass can be reduced while maintaining a high level of force.
  • the design of the double stroke magnet enables a reduction in the magnetic leakage flux, in particular in the area of the position measuring system.
  • a particularly short design of the double lifting magnet in the axial direction results when the fastening point of the pickup tube in the armature tube lies essentially in the same radial plane in which there is also a housing wall which conducts the magnetic flux of the internal coil and which at the same time supports the pressure tube in the housing.
  • a precise operation of the displacement measuring system in connection with a short construction is favored in that in addition to the sheathing of the pick-up coils an additional shielding disk is arranged between them and the housing wall which conducts the magnetic flux. It is furthermore expedient for a compact construction if the adjustably arranged pick-up coils are supported on the pressure pipe via plate springs.
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
  • the single figure shows a longitudinal section through an embodiment of an electromechanical double-stroke magnet according to the invention.
  • the figure shows a longitudinal section through an electromechanical double-stroke magnet 10, which essentially consists of a double-acting proportional magnet 11 and a displacement measuring system 12, which are arranged in a common housing 13 made of magnetically conductive material.
  • the housing 13 has a valve-side, first end face 14, on which a proportional valve, not shown, can be attached in a manner known per se.
  • a continuous hollow bore 15 extends in the longitudinal direction to an opposite, valve-facing, second end face 16.
  • This hollow bore 15 is stepped down several times and forms a first section 17 with a larger diameter that is open towards the valve-side end face 14, which receives, among other things, two electromagnetic coils 18 and 19 of the proportional magnet 11.
  • a second section 20 with a smaller diameter adjoins the first section 17 in the hollow bore 15, in which a pressure tube 21 of the double lifting magnet 10 is guided and supported.
  • the second section 20 of the hollow bore 15 merges into a third section 22 with a larger diameter, which is open to the second end face 16.
  • the pressure tube 21 inserted into the offset hollow bore 15 consists of several individual parts which are put together, soldered to one another and then machined so that the pressure tube 21 results in a one-piece component after it has been machined.
  • the one-piece pressure tube 21 essentially consists of a multi-section anchor tube 23 and a one-section pick-up tube 24 with a smaller diameter that is firmly connected to it.
  • the anchor tube 23 with a larger diameter than the receiver tube 24 there are between an external pressure tube piece 25 and an internal one Pressure tube part 26 arranged two sleeve-shaped intermediate pieces 27, 28, between which a hollow cylindrical middle piece 29 is located.
  • the pressure pipe piece 25 the pressure pipe part 26 and the middle piece 29 are made of magnetically conductive material.
  • the pressure tube piece 25 can therefore work in its hollow cylindrical region as a pole piece 31, while the pressure tube part 26 forms a corresponding pole piece 32, which each cooperate with an armature 33 arranged in the armature tube 23.
  • the pressure pipe section 25 has an outwardly projecting ring flange 34 with which the pressure pipe 21 is guided in the first section 17 of the hollow bore 15, while on the other hand the pressure pipe part 26 is guided on its outer circumference in the region of the second section 20 of the hollow bore 15.
  • the intermediate pieces 27, 28 and the middle piece 29 have simple, hollow cylindrical shapes with flat, radially extending end faces, so that complicated ring geometries are eliminated.
  • the two electromagnetic coils 18, 19 are arranged on the outer circumference of the pressure tube 21 in the annular space which lies between the first section 17 of the hollow bore 15 and the armature tube 23.
  • the coils 18, 19 are identical to one another, are concentric with one another and are arranged one behind the other on the armature tube 23, being separated from one another by a pole disk 35 made of magnetic flux-conducting material, which is located radially between the inner wall of the housing 13 and the outer diameter of the center piece 29 extends.
  • the coils 18, 19, which are identical to one another have a particularly short overall length in the axial direction, so that their common axial length corresponds approximately to the outer diameter of the coils 18, 19.
  • the armature 33 is mounted twice with the aid of a plunger 36. That part of the plunger 36 which projects outwards through the pressure pipe piece 25 forms a first bearing point 37 in a magnetic core 38 which is inserted into the pressure tube piece 25 from the first end face 14. An opposite end 39 of the plunger 36 is guided in a second bearing 41 which is formed in the pressure tube part 26. Immediately adjacent to the second bearing point 41 there is a fastening point 42 in the pressure tube part 26, in which the cup-shaped pickup tube 24 with its open end, on which a thickened outer collar is arranged, is tightly fastened in the anchor tube 23.
  • the pickup tube 24, which consists of magnetically non-conductive material, is generally brazed in the fastening point 42.
  • the fastening point 42 lies in the same radial plane as the second section 20 of the hollow bore 15 and thus also in the region of the pressure tube part 26 serving as pole shoe 32.
  • a housing wall 43 assigned to the second section 20 of the hollow bore 15, which is affected by the magnetic flux of the internal coil 19 is flowed through, is relatively thin. In this way, the measuring system 12 arranged in the third section 22 of the hollow bore 15 can be built relatively close to the inner coil 19, so that a particularly short construction results in the axial direction.
  • the displacement measuring system 12 has a coil body 45 which carries the measuring coils 44 and which is arranged on the pickup tube 24 so as to be axially displaceable.
  • the coil body 45 is surrounded on all sides by an iron-metallic sheathing 46, from which an assigned connecting cable is only led upwards through an opening in a manner not shown.
  • the sheathing 46 is supported on the side facing the armature tube 23 via a non-magnetic spacer 47, a shielding disk 48 made of annealed, soft magnetic material and disc springs 49 on the armature tube 23, so that the coil body 45 together with its sheathing 46 with the aid of a self-locking nut 51 is axially adjustable.
  • an anti-rotation device is on the outside of the casing 46 52 arranged.
  • the outside diameter of the shielding disk 48 is chosen to be as large as possible and makes full use of the diameter of the third section 22.
  • the outer diameter of the shielding disk 48 is in this way significantly larger than the diameter of the sheath 46 and also larger than the inner diameter of the coil 17.
  • the third section 22 of the hollow bore 15 is closed to the outside by an end cap 53.
  • a ferrite core 54 is arranged in the interior of the pickup tube 24 as part of the displacement measuring system 12 and is fixed non-positively on a core carrier 56 with the aid of a compression spring 55.
  • the core carrier 56 is fastened in the end 39 of the plunger 36, the axial fixing thereof being easy to carry out with the aid of a caulking 57.
  • the caulking 57 is expediently in the area between the fastening point 42 and the second bearing point 41.
  • a through hole 58 arranged in the magnetic core 38, a longitudinal hole 59 arranged in the armature 33 and a blind hole 61 running in the pressure tube part 26 ensure that in a double stroke magnet attached to a valve 10 pressure medium inside the pressure tube 21 reaches into the interior of the sensor tube 24 and pressure equalization between the individual rooms can take place.
  • the longitudinal bore 59 is placed radially outward as far as possible in order to reduce the eddy currents occurring in the magnetic circuit.
  • the armature 33 of the double-stroke magnet 10 has a short design, based on its axial length in relation to its diameter, as a result of which a reduction in the armature mass can be achieved with a constant high level of force.
  • the magnetic force characteristics can be influenced by the geometric overlap with which the armature end faces the associated intermediate pieces 27 or 28 protrude and thereby form radially extending working air gaps 62 and 63 in the region of the pole shoes 31 and 32 respectively.
  • the mode of operation of the double-stroke magnet 10 basically corresponds to the function of previously known double-stroke magnets, so that only shortly thereafter is it dealt with.
  • the armature 33 is acted upon with the aid of the two coils 18, 19 with two separate magnetic circuits, which each generate a force in the working air gaps 62 and 63. These two forces are directed against each other, so that the double-stroke magnet 10 can generate pulling and pushing forces in contrast to single-acting proportional magnets.
  • the two coils 18, 19 are each supplied with a bias current in the rest position of the armature 33, which is approximately half the maximum current. The opposing forces acting on the armature 33 keep it in the rest position.
  • the magnetic flux of the inner coil 19 flows through the housing wall 43 during operation and flows in the pressure tube part 26 past the fastening point 42 to the pole shoe 32. Despite the relatively close The axial position of the measuring coils 44 in relation to the housing wall 43 prevents the sheathing 46 and the additional shielding disk 48 from interfering stray flux from the housing 13 into the measuring coils 44, so that the measuring system 12 can work precisely and correctly, despite the compact design of the double solenoid 10.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem elektromechanischen Doppelhubmagnet nach der im Oberbegriff des Anspruchs 1 näher angegebenen Gattung.The invention relates to an electromechanical double-stroke magnet according to the type specified in the preamble of claim 1.

Es ist schon ein solcher elektromechanischer Doppelhubmagnet aus der Druckschrift WO 91/05957 bekannt, wobei der in nasser Bauweise ausgeführte Doppelhubmagnet zum Ansteuern eines Mehrwege-Regelventils verwendet wird. Der proportional arbeitende Doppelhubmagnet weist zwei elektromagnetische Spulen auf, die in Ruhestellung des Ankers jeweils mit einem Vorstrom beaufschlagt werden, der etwa die Hälfte des Maximalstroms beträgt. Dieser Doppelhubmagnet erreicht daher eine hohe Dynamik und kommt mit geringem Ansteuerstrom aus. Er benötigt keine polarisierten Permanentmagnete und kann zudem ziehende und drückende Kräfte erzeugen. Bei diesem Doppelhubmagnet ist nun von Nachteil, daß bei seiner nassen Bauweise die Abdichtung von mehreren Bauelementen übernommen werden muß und sich daher schwierig gestaltet. Dabei weist der proportional arbeitende Doppelhubmagnet relativ aufwendige Polschuhe mit komplexen Ringgeometrien auf, die zu einer kostspieligen Bauweise führen. Ferner ist an dem Doppelhubmagnet kein Wegaufnehmersystem vorgesehen, so daß er für Lageregelkreise nicht unmittelbar verwendbar ist. Ferner baut der Doppelhubmagnet verhältnismäßig lang, wobei seine axiale Länge nahezu dem doppelten Durchmesser der Spulen entspricht. In vielen Einsatzfällen sind solche lang bauenden Magnete nicht verwendbar.Such an electromechanical double-stroke magnet is already known from the publication WO 91/05957, the double-stroke magnet, which is designed in a wet design, being used to control a multi-way control valve. The proportional double-stroke magnet has two electromagnetic coils, each of which is supplied with a bias current in the rest position of the armature, which is approximately half the maximum current. This double solenoid therefore achieves a high level of dynamics and manages with a low control current. It does not require polarized permanent magnets and can also generate pulling and pushing forces. A disadvantage of this double-stroke magnet is that, with its wet construction, the sealing of several components must be carried out and is therefore difficult. The proportional double-stroke magnet has relatively complex pole pieces with complex ring geometries, which lead to an expensive construction. Furthermore, no displacement transducer system is provided on the double-stroke magnet, so that it is used for position control loops is not immediately usable. Furthermore, the double-stroke magnet has a relatively long construction, its axial length almost corresponding to twice the diameter of the coils. In many applications, such long magnets cannot be used.

Ferner ist aus der Druckschrift EP 0 278 227 A3 ein Proportionalmagnet zur elektrischen Ansteuerung hydraulischer Ventile bekannt, der neben einer Druckrohrbauweise auch ein integriertes Wegmeßsystem aufweist. Bei diesem Proportionalmagnet handelt es sich um eine einfach wirkende Bauweise mit einer einzigen Spule, bei der auch keine ziehenden und drückenden Kräfte erzeugbar sind. Die Dynamik solcher einfach wirkender Proportionalmagnete reicht daher in bestimmten Anwendungsfällen nicht aus, wobei diese Bauform auch höhere Ansteuerströme erfordert. Hinzu kommt, daß dieser Proportionalmagnet für manche Einsatzfälle in axialer Richtung zu lang baut, da sein Wegaufnehmersystem relativ weit entfernt von der elektromagnetischen Spule angeordnet ist. Durch die unsymmetrischen Kraftverhältnisse beim einfach wirkenden Magneten wird auch die Auslegung einer Lageregelung erschwert.Furthermore, a proportional magnet for the electrical control of hydraulic valves is known from the document EP 0 278 227 A3, which in addition to a pressure tube construction also has an integrated displacement measuring system. This proportional magnet is a single-acting design with a single coil, in which no pulling and pushing forces can be generated. The dynamics of such single-acting proportional magnets are therefore not sufficient in certain applications, although this design also requires higher control currents. In addition, this proportional magnet is too long in the axial direction for some applications, since its displacement sensor system is arranged relatively far away from the electromagnetic coil. Due to the asymmetrical force relationships in the single-acting magnet, the design of a position control is also made more difficult.

Weiterhin ist aus der DE-A-3 241 521 ein hochdynamischer Proportionalmagnet zur Ventilansteuerung bekannt, der eine Druckrohrbauweise und ein integriertes Wegmeßsystem aufweist. Hier sind zwei elektromagnetische Spulen übereinander angeordnet und gleich- oder gegensinnig ansteuerbar, so daß die Stellkraft von Null bis zu einem Maximalwert veränderbar ist. Dieser Proportionalmagnet ist als Einfachhubmagnet ausgebildet und hat eine Befestigungsstelle eines Aufnehmerrohrs im Ankerrohr, die in relativ großem Abstand von der Spule liegt und damit einen lang bauenden Einfachhubmagneten ergibt.Furthermore, from DE-A-3 241 521 a highly dynamic proportional magnet for valve control is known, which has a pressure tube construction and an integrated position measuring system. Here two electromagnetic coils are arranged one above the other and can be controlled in the same or opposite directions, so that the actuating force can be varied from zero to a maximum value. This proportional magnet is designed as a single stroke magnet and has a mounting point for a pickup tube in the armature tube, which is located at a relatively large distance from the coil and thus results in a long single stroke magnet.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße elektromechanische Doppelhubmagnet mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß er unter Beibehaltung seiner besonderen Eigenschaften wie hohe Dynamik, geringer Ansteuerstrom und symmetrische Kraftverhältnisse eine kostengünstige und in axialer Richtung besonders kompakte Bauform ermöglicht. Durch die Verwendung eines Druckrohrs lassen sich die Probleme bezüglich Abdichtung und Integration eines Wegmeßsystems leichter beherrschen. Ferner lassen sich im Druckrohr relativ einfache Magnetpolformen verwenden, wobei in Verbindung mit unterschiedlichen Anker-Polringüberdeckungen ein günstiger Verlauf der Kraft-Weg-Kennlinien erzielbar ist. Dabei ist von Vorteil daßThe electromechanical double-stroke magnet according to the invention with the characterizing features of the main claim has the advantage that, while maintaining its special properties such as high dynamics, low control current and symmetrical force ratios, it enables a cost-effective and particularly compact design in the axial direction. The use of a pressure pipe makes it easier to master the problems associated with sealing and integrating a measuring system. In addition, relatively simple magnetic pole shapes can be used in the pressure pipe, and a favorable course of the force-displacement characteristic curves can be achieved in connection with different armature pole ring covers. It is advantageous that

der Magnetfluß im wesentlichen über radiale Luftspalte geführt wird. Zudem lässt sich bei diesem Doppelhubmagnet eine kurze Ankerbauform, d.h. seine Länge im Verhältnis zum Durchmesser, realisieren, wodurch dessen Ankermasse bei gleichbleibend hohem Kraftniveau reduziert werden kann. Fernerhin ermöglicht die Bauform des Doppelhubmagneten eine Reduzierung des Magnetstreuflußes, insbesondere im Bereich des Wegmeßsystems. Eine in axialer Richtung besonders kurze Bauform des Doppelhubmagneten ergibt sich, wenn die Befestigungsstelle des Aufnehmerrohrs im Ankerrohr im wesentlichen in der gleichen radialen Ebene liegt, in welcher auch eine den Magnetfluß der innenliegenden Spule leitende Gehäusewand liegt, welche zugleich das Druckrohr im Gehäuse abstützt. Eine genaue Arbeitsweise des Wegmeßsystems in Verbindung mit einer kurzen Bauweise wird dadurch begünstigt, daß zusätzlich zur Ummantelung der Aufnehmerspulen zwischen diesen und der den Magnetfluß leitenden Gehäusewand eine zusätzliche Abschirmscheibe angeordnet ist. Zweckmäßig für eine kompakte Bauweise ist ferner, wenn die justierbar angeordneten Aufnehmerspulen sich über Tellerfedern am Druckrohr abstützen.the magnetic flux is conducted essentially over radial air gaps. In addition, a short armature design, i.e. realize its length in relation to the diameter, whereby its anchor mass can be reduced while maintaining a high level of force. Furthermore, the design of the double stroke magnet enables a reduction in the magnetic leakage flux, in particular in the area of the position measuring system. A particularly short design of the double lifting magnet in the axial direction results when the fastening point of the pickup tube in the armature tube lies essentially in the same radial plane in which there is also a housing wall which conducts the magnetic flux of the internal coil and which at the same time supports the pressure tube in the housing. A precise operation of the displacement measuring system in connection with a short construction is favored in that in addition to the sheathing of the pick-up coils an additional shielding disk is arranged between them and the housing wall which conducts the magnetic flux. It is furthermore expedient for a compact construction if the adjustably arranged pick-up coils are supported on the pressure pipe via plate springs.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Doppelhubmagneten möglich. Sie unterstützen vor allem eine einfache und kompakte Bauweise und begünstigen zudem eine leichte Montage des Doppelhubmagneten.The measures listed in the subclaims allow advantageous developments and improvements of the double-stroke magnet specified in claim 1. Above all, they support a simple and compact design and also promote easy assembly of the double-stroke magnet.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt einen Längsschnitt durch eine erfindungsgemäße Ausführungsform eines elektromechanischen Doppelhubmagneten.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The single figure shows a longitudinal section through an embodiment of an electromechanical double-stroke magnet according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Figur zeigt einen Längsschnitt durch einen elektromechanischen Doppelhubmagnet 10, der im wesentlichen aus einem doppelt wirkenden Proportionalmagneten 11 und einem Wegmeßsystem 12 besteht, die in einem gemeinsamen Gehäuse 13 aus magnetisch leitendem Material angeordnet sind. Das Gehäuse 13 weist eine ventilseitige, erste Stirnfläche 14 auf, an der in an sich bekannter Weise ein nicht näher gezeichnetes Proportionalventil angebaut werden kann.The figure shows a longitudinal section through an electromechanical double-stroke magnet 10, which essentially consists of a double-acting proportional magnet 11 and a displacement measuring system 12, which are arranged in a common housing 13 made of magnetically conductive material. The housing 13 has a valve-side, first end face 14, on which a proportional valve, not shown, can be attached in a manner known per se.

Im Gehäuse 13 verläuft ausgehend von der ventilseitigen Stirnfläche 14 in Längsrichtung eine durchgehende Hohlbohrung 15 zu einer entgegengesetzt liegenden, ventilabgewandten, zweiten Stirnfläche 16. Diese Hohlbohrung 15 ist mehrfach abgesetzt und bildet einen zur ventilseitigen Stirnfläche 14 hin offenen, ersten Abschnitt 17 mit größerem Durchmesser, welcher unter anderem zwei elektromagnetische Spulen 18 bzw. 19 des Proportionalmagneten 11 aufnimmt. An den ersten Abschnitt 17 schließt sich in der Hohlbohrung 15 ein zweiter Abschnitt 20 mit kleinerem Durchmesser an, in dem ein Druckrohr 21 des Doppelhubmagneten 10 geführt und gelagert ist. Der zweite Abschnitt 20 der Hohlbohrung 15 geht in einen dritten Abschnitt 22 mit größerem Durchmesser über, der zur zweiten Stirnfläche 16 hin offen ist.In the housing 13, starting from the valve-side end face 14, a continuous hollow bore 15 extends in the longitudinal direction to an opposite, valve-facing, second end face 16. This hollow bore 15 is stepped down several times and forms a first section 17 with a larger diameter that is open towards the valve-side end face 14, which receives, among other things, two electromagnetic coils 18 and 19 of the proportional magnet 11. A second section 20 with a smaller diameter adjoins the first section 17 in the hollow bore 15, in which a pressure tube 21 of the double lifting magnet 10 is guided and supported. The second section 20 of the hollow bore 15 merges into a third section 22 with a larger diameter, which is open to the second end face 16.

Das in die abgesetzte Hohlbohrung 15 eingeführte Druckrohr 21 besteht aus mehreren Einzelteilen, die so zusammengesteckt, miteinander verlötet und anschließend bearbeitet sind, daß das Druckrohr 21 nach seiner Bearbeitung ein einstückiges Bauelement ergibt. Das einstückige Druckrohr 21 besteht im wesentlichen aus einem mehrgliedrigen Ankerrohr 23 und einem damit fest verbundenen, eingliedrigen Aufnehmerrohr 24 mit kleinerem Durchmesser. Bei dem Ankerrohr 23 mit gegenüber dem Aufnehmerrohr 24 größeren Durchmesser sind zwischen einem außenliegenden Druckrohrstück 25 und einem innenliegenden Druckrohrteil 26 zwei hülsenförmige Zwischenstücke 27, 28 angeordnet, zwischen denen ein hohlzylindrisches Mittelstück 29 liegt. Während die beiden Zwischenstücke 27, 28 aus magnetisch nicht leitendem Material bestehen, sind das Druckrohrstück 25, das Druckrohrteil 26 sowie das Mittelstück 29 aus magnetisch leitendem Material hergestellt. Das Druckrohrstück 25 kann daher in seinem hohlzylindrischen Bereich als Polschuh 31 arbeiten, während das Druckrohrteil 26 einen entsprechenden Polschuh 32 bildet, die jeweils mit einem im Ankerrohr 23 angeordneten Anker 33 zusammenarbeiten. Das Druckrohrstück 25 weist dabei einen nach außen kragenden Ringflansch 34 auf, mit dem das Druckrohr 21 im ersten Abschnitt 17 der Hohlbohrung 15 geführt ist, während andererseits das Druckrohrteil 26 an seinem Außenumfang im Bereich des zweiten Abschnitts 20 der Hohlbohrung 15 geführt ist. Die Zwischenstücke 27, 28 sowie das Mittelstück 29 weisen dabei einfache, hohlzylindrische Formen mit ebenen, radial verlaufenden Stirnflächen auf, so daß komplizierte Ringgeometrien entfallen.The pressure tube 21 inserted into the offset hollow bore 15 consists of several individual parts which are put together, soldered to one another and then machined so that the pressure tube 21 results in a one-piece component after it has been machined. The one-piece pressure tube 21 essentially consists of a multi-section anchor tube 23 and a one-section pick-up tube 24 with a smaller diameter that is firmly connected to it. In the case of the anchor tube 23 with a larger diameter than the receiver tube 24, there are between an external pressure tube piece 25 and an internal one Pressure tube part 26 arranged two sleeve-shaped intermediate pieces 27, 28, between which a hollow cylindrical middle piece 29 is located. While the two intermediate pieces 27, 28 consist of magnetically non-conductive material, the pressure pipe piece 25, the pressure pipe part 26 and the middle piece 29 are made of magnetically conductive material. The pressure tube piece 25 can therefore work in its hollow cylindrical region as a pole piece 31, while the pressure tube part 26 forms a corresponding pole piece 32, which each cooperate with an armature 33 arranged in the armature tube 23. The pressure pipe section 25 has an outwardly projecting ring flange 34 with which the pressure pipe 21 is guided in the first section 17 of the hollow bore 15, while on the other hand the pressure pipe part 26 is guided on its outer circumference in the region of the second section 20 of the hollow bore 15. The intermediate pieces 27, 28 and the middle piece 29 have simple, hollow cylindrical shapes with flat, radially extending end faces, so that complicated ring geometries are eliminated.

Am Außenumfang des Druckrohres 21 sind in dem ringförmigen Raum, der zwischen dem ersten Abschnitt 17 der Hohlbohrung 15 und dem Ankerrohr 23 liegt, die beiden elektromagnetischen Spulen 18, 19 angeordnet. Die Spulen 18, 19 sind untereinander gleich ausgebildet, liegen konzentrisch zueinander und sind hintereinander auf dem Ankerrohr 23 angeordnet, wobei sie voneinander durch eine Polscheibe 35 aus magnetflußleitendem Material getrennt sind, die sich radial zwischen der Innenwand des Gehäuses 13 und dem Außendurchmesser des Mittelstücks 29 erstreckt. Die untereinander gleichen Spulen 18, 19 weisen in axialer Richtung eine besonders kurze Baulänge auf, so daß ihre gemeinsame axiale Länge ungefähr dem Außendurchmesser der Spulen 18, 19 entspricht.The two electromagnetic coils 18, 19 are arranged on the outer circumference of the pressure tube 21 in the annular space which lies between the first section 17 of the hollow bore 15 and the armature tube 23. The coils 18, 19 are identical to one another, are concentric with one another and are arranged one behind the other on the armature tube 23, being separated from one another by a pole disk 35 made of magnetic flux-conducting material, which is located radially between the inner wall of the housing 13 and the outer diameter of the center piece 29 extends. The coils 18, 19, which are identical to one another, have a particularly short overall length in the axial direction, so that their common axial length corresponds approximately to the outer diameter of the coils 18, 19.

Der Anker 33 ist mit Hilfe eines Stößels 36 zweifach gelagert. Der durch das Druckrohrstück 25 nach außen ragende Teil des Stößels 36 bildet eine erste Lagerstelle 37 in einem Magnetkern 38, der in das Druckrohrstück 25 von der ersten Stirnfläche 14 her eingesetzt ist. Ein entgegengesetzt liegendes Ende 39 des Stößels 36 ist in einer zweiten Lagerstelle 41 geführt, die im Druckrohrteil 26 ausgebildet ist. Unmittelbar angrenzend an die zweite Lagerstelle 41 befindet sich im Druckrohrteil 26 eine Befestigungsstelle 42, in der das becherförmige Aufnehmerrohr 24 mit seinem offenen Ende, an dem ein verdickter Außenbund angeordnet ist, in dem Ankerrohr 23 dicht befestigt ist. Das Aufnehmerrohr 24, das aus magnetisch nicht leitendem Material besteht, wird in der Befestigungsstelle 42 in der Regel hart verlötet. Die Befestigungsstelle 42 liegt auf diese Weise in der gleichen radialen Ebene wie der zweite Abschnitt 20 der Hohlbohrung 15 und somit auch im Bereich des als Polschuh 32 dienenden Druckrohrteils 26. Eine dem zweiten Abschnitt 20 der Hohlbohrung 15 zugeordnete Gehäusewand 43, welche von dem Magnetfluß der innenliegenden Spule 19 durchströmt wird, ist relativ dünn ausgebildet. Auf diese Weise kann das im dritten Abschnitt 22 der Hohlbohrung 15 angeordnete Wegmeßsystem 12 verhältnismäßig nahe an die innenliegende Spule 19 herangebaut werden, so daß sich in axialer Richtung eine besonders kurze Bauweise ergibt.The armature 33 is mounted twice with the aid of a plunger 36. That part of the plunger 36 which projects outwards through the pressure pipe piece 25 forms a first bearing point 37 in a magnetic core 38 which is inserted into the pressure tube piece 25 from the first end face 14. An opposite end 39 of the plunger 36 is guided in a second bearing 41 which is formed in the pressure tube part 26. Immediately adjacent to the second bearing point 41 there is a fastening point 42 in the pressure tube part 26, in which the cup-shaped pickup tube 24 with its open end, on which a thickened outer collar is arranged, is tightly fastened in the anchor tube 23. The pickup tube 24, which consists of magnetically non-conductive material, is generally brazed in the fastening point 42. In this way, the fastening point 42 lies in the same radial plane as the second section 20 of the hollow bore 15 and thus also in the region of the pressure tube part 26 serving as pole shoe 32. A housing wall 43 assigned to the second section 20 of the hollow bore 15, which is affected by the magnetic flux of the internal coil 19 is flowed through, is relatively thin. In this way, the measuring system 12 arranged in the third section 22 of the hollow bore 15 can be built relatively close to the inner coil 19, so that a particularly short construction results in the axial direction.

Das Wegmeßsystem 12 weist einen die Meßspulen 44 tragenden Spulenkörper 45 auf, der axial verschiebbar auf dem Aufnehmerrohr 24 angeordnet ist. Der Spulenkörper 45 ist allseitig von einer eisenmetallischen Ummantelung 46 umgeben, aus der lediglich nach oben durch eine Öffnung in nicht näher gezeichneter Weise ein zugeordnetes Anschlußkabel herausgeführt wird. Die Ummantelung 46 stützt sich auf der dem Ankerrohr 23 zugewandten Seite über eine nicht magnetische Abstandsscheibe 47, eine Abschirmscheibe 48 aus geglühtem, weichmagnetischem Material und Tellerfedern 49 am Ankerrohr 23 ab, so daß der Spulenkörper 45 zusammen mit seiner Ummantelung 46 mit Hilfe einer selbstsichernden Mutter 51 axial justierbar ist. Zum Schutz gegen Verdrehen ist außen an der Ummantelung 46 eine Verdrehsicherung 52 angeordnet. Der Außendurchmesser der Abschirmscheibe 48 wird möglichst groß gewählt und nutzt den Durchmesser des dritten Abschnitts 22 voll aus. Der Außendurchmesser der Abschirmscheibe 48 ist auf diese Weise wesentlich größer als der Durchmesser der Ummantelung 46 und auch größer als der Innendurchmesser der Spule 17. Der dritte Abschnitt 22 der Hohlbohrung 15 ist nach außen hin durch eine Abschlußkappe 53 verschlossen.The displacement measuring system 12 has a coil body 45 which carries the measuring coils 44 and which is arranged on the pickup tube 24 so as to be axially displaceable. The coil body 45 is surrounded on all sides by an iron-metallic sheathing 46, from which an assigned connecting cable is only led upwards through an opening in a manner not shown. The sheathing 46 is supported on the side facing the armature tube 23 via a non-magnetic spacer 47, a shielding disk 48 made of annealed, soft magnetic material and disc springs 49 on the armature tube 23, so that the coil body 45 together with its sheathing 46 with the aid of a self-locking nut 51 is axially adjustable. To protect against rotation, an anti-rotation device is on the outside of the casing 46 52 arranged. The outside diameter of the shielding disk 48 is chosen to be as large as possible and makes full use of the diameter of the third section 22. The outer diameter of the shielding disk 48 is in this way significantly larger than the diameter of the sheath 46 and also larger than the inner diameter of the coil 17. The third section 22 of the hollow bore 15 is closed to the outside by an end cap 53.

Im Inneren des Aufnehmerrohrs 24 ist als Teil des Wegmeßsystems 12 ein Ferritkern 54 angeordnet, der mit Hilfe einer Druckfeder 55 kraftschlüssig auf einem Kernträger 56 fixiert ist. Der Kernträger 56 seinerseits ist im Ende 39 des Stößels 36 befestigt, wobei dessen axiale Festlegung mit Hilfe einer Verstemmung 57 leicht durchführbar ist. Die Verstemmung 57 liegt dabei zweckmäßig im Bereich zwischen der Befestigungsstelle 42 und der zweiten Lagerstelle 41.A ferrite core 54 is arranged in the interior of the pickup tube 24 as part of the displacement measuring system 12 and is fixed non-positively on a core carrier 56 with the aid of a compression spring 55. The core carrier 56, in turn, is fastened in the end 39 of the plunger 36, the axial fixing thereof being easy to carry out with the aid of a caulking 57. The caulking 57 is expediently in the area between the fastening point 42 and the second bearing point 41.

Eine in dem Magnetkern 38 angeordnete Durchgangsbohrung 58, eine im Anker 33 angeordnete Längsbohrung 59 sowie eine im Druckrohrteil 26 verlaufende Sacklochbohrung 61 sorgen dafür, daß bei einem an einem Ventil angebauten Doppelhubmagneten 10 Druckmittel innerhalb des Druckrohrs 21 bis in den Innenraum des Aufnehmerrohrs 24 gelangen und ein Druckausgleich zwischen den einzelnen Räumen stattfinden kann. Die Längsbohrung 59 ist radial möglichst weit nach außen gelegt um die im Magnetkreis auftretenden elektrischen Wirbelströme zu reduzieren.A through hole 58 arranged in the magnetic core 38, a longitudinal hole 59 arranged in the armature 33 and a blind hole 61 running in the pressure tube part 26 ensure that in a double stroke magnet attached to a valve 10 pressure medium inside the pressure tube 21 reaches into the interior of the sensor tube 24 and pressure equalization between the individual rooms can take place. The longitudinal bore 59 is placed radially outward as far as possible in order to reduce the eddy currents occurring in the magnetic circuit.

Der Anker 33 des Doppelhubmagneten 10 weist eine kurze Bauform auf, bezogen auf seine axiale Länge im Verhältnis zu seinem Durchmesser, wodurch sich bei gleichbleibend hohem Kraftniveau eine Reduzierung der Ankermasse erzielen lässt. Eine Beeinflussung der Magnetkraftkennlinien lässt sich dabei durch die geometrische Überdeckung erreichen, mit welcher die Ankerstirnflächen die zugeordneten Zwischenstücke 27 bzw. 28 überragen und dabei im Bereich der Polschuhe 31 bzw. 32 radial verlaufende Arbeitsluftspalte 62 bzw. 63 bilden.The armature 33 of the double-stroke magnet 10 has a short design, based on its axial length in relation to its diameter, as a result of which a reduction in the armature mass can be achieved with a constant high level of force. The magnetic force characteristics can be influenced by the geometric overlap with which the armature end faces the associated intermediate pieces 27 or 28 protrude and thereby form radially extending working air gaps 62 and 63 in the region of the pole shoes 31 and 32 respectively.

Die Wirkungsweise des Doppelhubmagneten 10 entspricht grundsätzlich der Funktion vorbekannter Doppelhubmagneten, so daß nur kurz darauf eingeganen wird. Beim Doppelhubmagnet 10 wird der Anker 33 mit Hilfe der beiden Spulen 18, 19 mit zwei voneinander getrennten magnetischen Kreisen beaufschlagt, die jeweils eine Kraft in den Arbeitsluftspalten 62 bzw. 63 erzeugen. Diese beiden Kräfte sind gegeneinander gerichtet, so daß der Doppelhubmagnet 10 im Gegensatz zu einfach wirkenden Proportionalmagneten ziehende und drückende Kräfte erzeugen kann. Zweckmäßigerweise werden die beiden Spulen 18, 19 in Ruhestellung des Ankers 33 jeweils mit einem Vorstrom beaufschlagt, der etwa die Hälfte des Maximalstroms beträgt. Die entgegengesetzt dabei auf den Anker 33 wirkenden Kräfte halten ihn in Ruhestellung. Durch Änderung der Bestromung in einer oder in beiden Spulen 18, 19 wird das Kräftegleichgewicht am Anker 33 gestört und er kann eine resultierende Kraft in der einen oder anderen Richtung erzeugen. Durch diese Vormagnetisierung wird die Dynamik des Doppelhubmagneten 10 verbessert, da die zur Verfügung stehende Kraft voll in Dynamik umgesetzt werden kann. Zudem ist der von der elektrischen Ansteuerung zur Verfügung zu stellende Maximalstrom wegen der beiden Spulen 18, 19 bei gleicher Maximalkraftdifferenz nur ca. halb so groß wie bei üblichen Proportionalmagneten, so daß der Doppelhubmagnet 10 mit einem geringen Ansteuerstrom auskommt. Durch die symmetrische Ausgestaltung der Kraftverhältnisse wird die Auslegung einer Lageregelung mit Hilfe des Wegmeßsystems 12 erheblich vereinfacht.The mode of operation of the double-stroke magnet 10 basically corresponds to the function of previously known double-stroke magnets, so that only shortly thereafter is it dealt with. In the case of the double-stroke magnet 10, the armature 33 is acted upon with the aid of the two coils 18, 19 with two separate magnetic circuits, which each generate a force in the working air gaps 62 and 63. These two forces are directed against each other, so that the double-stroke magnet 10 can generate pulling and pushing forces in contrast to single-acting proportional magnets. Advantageously, the two coils 18, 19 are each supplied with a bias current in the rest position of the armature 33, which is approximately half the maximum current. The opposing forces acting on the armature 33 keep it in the rest position. By changing the current in one or both coils 18, 19, the balance of forces at armature 33 is disturbed and it can generate a resultant force in one direction or the other. This premagnetization improves the dynamics of the double-stroke magnet 10, since the force available can be fully converted into dynamics. In addition, because of the two coils 18, 19, the maximum current to be made available by the electrical control is only about half as large as with conventional proportional magnets, with the same maximum force difference, so that the double-stroke magnet 10 manages with a low control current. The symmetrical design of the force relationships considerably simplifies the design of a position control with the aid of the position measuring system 12.

Der Magnetfluß der innenliegenden Spule 19 durchströmt im Betrieb die Gehäusewand 43 und fließt in dem Druckrohrteil 26 vorbei an der Befestigungsstelle 42 zu dem Polschuh 32. Trotz der relativ nahen axialen Lage der Meßspulen 44 zur Gehäusewand 43 verhindert hierbei die Ummantelung 46 sowie die zusätzliche Abschirmscheibe 48 einen störenden Streufluß aus dem Gehäuse 13 in die Meßspulen 44, so daß das Meßsystem 12 trotz der kompakten Bauweise des Doppelhubmagneten 10 genau und einwandfrei arbeiten kann.The magnetic flux of the inner coil 19 flows through the housing wall 43 during operation and flows in the pressure tube part 26 past the fastening point 42 to the pole shoe 32. Despite the relatively close The axial position of the measuring coils 44 in relation to the housing wall 43 prevents the sheathing 46 and the additional shielding disk 48 from interfering stray flux from the housing 13 into the measuring coils 44, so that the measuring system 12 can work precisely and correctly, despite the compact design of the double solenoid 10.

Selbstverständlich sind an der gezeigten Ausführungsform Änderungen möglich, ohne vom Gedanken der Erfindung abzuweichen. So kann anstelle des gezeigten Wegmeßsystems mit drei Meßspulen für eine Transformatorenbauweise auch ein Spulenkörper mit zwei Drosselspulen verwendet werden. Auch ist es möglich, die Befestigungsstelle 42 im Druckrohrteil 26 in Richtung zum Anker 33 hin zu verlegen, ohne die Vorteile der kompakten Bauweise zu verlassen. Fernerhin wäre es möglich, die Verstemmung 57 für eine weitere Baulängenreduzierung auf die andere Seite der zweiten Lagerstelle 41 zu verlegen, wobei sie auch innerhalb des Ankers 33 angeordnet werden könnte. Auch wäre es denkbar, anstelle des gezeigten Aufnehmerrohrs 24 an dessem offenen Ende einen radialen Flansch vorzusehen und es damit an der radialen Stirnseite des Druckrohrteils 26 zu befestigen, so daß hierbei wenig axialer Bauraum verloren geht. Obwohl die gezeigte Bauweise des Doppelhubmagneten 10 besonders vorteilhaft ist, kann bei Bedarf auch auf eines der Abschirmelemente, insbesondere die Abschirmscheibe 48, verzichtet werden.Of course, changes can be made to the embodiment shown without departing from the spirit of the invention. Thus, instead of the displacement measuring system shown with three measuring coils for a transformer construction, a coil body with two choke coils can also be used. It is also possible to move the fastening point 42 in the pressure tube part 26 in the direction of the armature 33 without leaving the advantages of the compact design. Furthermore, it would be possible to move the caulking 57 to the other side of the second bearing 41 for a further reduction in overall length, whereby it could also be arranged within the armature 33. It would also be conceivable to provide a radial flange instead of the pick-up tube 24 shown at its open end and thus to fasten it to the radial end face of the pressure tube part 26, so that little axial installation space is lost. Although the design of the double-stroke magnet 10 shown is particularly advantageous, one of the shielding elements, in particular the shielding disk 48, can also be dispensed with if required.

Claims (13)

  1. Double-acting electromechanical solenoid actuator, in particular for actuating a valve slide, having two electric coils (18, 19) which are concentric with respect to one another and are arranged in a housing (13) one next to the other on an essentially tubular body and are separated from one another by means of a magnetic flux-conducting pole disc (35), the body receiving in its interior an armature (33) which is mounted with its associated plunger (36) on both sides of the armature and is guided so as to be longitudinally movable, and in which pole shoes (31, 32) form with the armature (33) associated working air gaps (62, 63), characterized in that the tubular body is constructed as an essentially sleeve-shaped pressure pipe (21) which comprises an armature tube (23), which bears the two coils (18, 19), and a pick-up tube (24) which is arranged in said armature tube (23) in a leakproof and fixed fashion and is integrally connected by its open end to the armature tube (23) at an attachment point (42) and on whose projecting, free end a displacement measuring system (12) for the travel of the armature (33) is arranged, in that the attachment point (42) is located in the axial direction in a region of the armature tube (23) which is penetrated by the magnetic flux of the internal coil (19), and in that the integral armature tube (23) has two external sections which serve as pole shoes (31, 32) and are constructed as a pressure pipe element (25) and as a pressure pipe component (26) which receives the attachment point (42) and between which two non-magnetic intermediate elements (27, 28), which are separated from one another by a magnetic flux-conducting centre element (29), are located.
  2. Double-acting solenoid actuator according to Claim 1, characterized in that the attachment point (42) is essentially located in a radial plane with respect to the housing (13), in which plane a housing wall (43) which conducts the magnetic flux of the internal coil (19) supports the armature tube (23) in the housing (13).
  3. Double-acting solenoid actuator according to one of Claims 1 to 2, characterized in that the two intermediate elements (27, 28) and the centre element (29) are each constructed as hollow-cylindrical elements with planar end faces.
  4. Double-acting solenoid actuator according to one of Claims 1 to 3, characterized in that the armature (33) forms, together with the pole shoes (31, 32) on the pressure pipe element (25) and on the pressure pipe component (26), working air gaps (62, 63) in which the magnetic flux is transferred essentially radially.
  5. Double-acting solenoid actuator according to Claim 3 or 4, characterized in that the axial length of the armature (33) essentially corresponds to the length of a coil (18, 19) and in particular both coils (18, 19) are of the same size.
  6. Double-acting solenoid actuator according to one or more of Claims 1 to 5, characterized in that the measurement coils (44), arranged on the outside of the pick-up tube (24), of the displacement measuring system (12) are surrounded by a magnetically screening casing (46).
  7. Double-acting solenoid actuator according to Claim 6, characterized in that an additional screening element (48) is arranged between the casing (46) and the components (43, 26) through which the magnetic flux of the internal coil (19) flows.
  8. Double-acting solenoid actuator according to Claim 7, characterized in that the screening element consists, as a disc (48), of low-retentivity material whose external diameter is greater than that of the casing (46) and than the internal diameter of the coil (19).
  9. Double-acting solenoid actuator according to one of Claims 6 to 8, characterized in that the measurement coils (44), with the casing (46), and the screening element (48) are arranged on the pick-up tube (24) in an axially adjustable fashion and are supported on the pressure pipe (21) by means of cup springs (49).
  10. Double-acting solenoid actuator according to one or more of Claims 1 to 9, characterized in that a core carrier (56) which is made of non-magnetic material and which projects into the pick-up tube (24) is attached to the plunger (36) of the armature (33), a ferrite core (54) of the displacement measurement system (12) being guided in a sliding fashion on the said core carrier (56) and being held in an end position by a spring (55).
  11. Double-acting solenoid actuator according to Claim 10, characterized in that a bearing point (41) for the plunger (36) is arranged in the pressure pipe component (26) between the attachment point (42) and the armature (33), and the core carrier (56) is connected to the plunger (36) in a positively engaging fashion, in particular caulked, in the region between the attachment point (42) and the bearing point (41).
  12. Double-acting solenoid actuator according to one or more of the preceding claims, characterized in that the axial length of the two coils (18, 19) together corresponds essentially to their external diameter.
  13. Double-acting solenoid actuator according to one or more of Claims 1 to 12, characterized in that the housing (13) receives the sleeve-shaped pressure pipe (21) in a continuous, multiply stepped hollow hole (15) whose part (20) with a smaller diameter separates two parts (17, 22) with a larger diameter, the pressure pipe (21) being mounted with an annular flange (34) in the part (17) which receives the coils (18, 19) and has a larger diameter and being mounted with its armature tube (23) in the part (20) with a small diameter, while the pick-up coils (44), with the casing (46), and the screening disc (48) are arranged in the other part (22) with a large diameter.
EP93102605A 1992-03-16 1993-02-19 Double acting electromagnetic actuator Expired - Lifetime EP0564794B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4208367 1992-03-16
DE4208367A DE4208367A1 (en) 1992-03-16 1992-03-16 ELECTROMECHANICAL DOUBLE LIFT MAGNET

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EP0564794A1 EP0564794A1 (en) 1993-10-13
EP0564794B1 true EP0564794B1 (en) 1996-05-08

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DE (2) DE4208367A1 (en)

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Also Published As

Publication number Publication date
EP0564794A1 (en) 1993-10-13
JP3423343B2 (en) 2003-07-07
DE4208367A1 (en) 1993-09-23
JPH0613229A (en) 1994-01-21
DE59302488D1 (en) 1996-06-13

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