EP1390959B1 - Magnet arrangement - Google Patents

Magnet arrangement Download PDF

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Publication number
EP1390959B1
EP1390959B1 EP02740320A EP02740320A EP1390959B1 EP 1390959 B1 EP1390959 B1 EP 1390959B1 EP 02740320 A EP02740320 A EP 02740320A EP 02740320 A EP02740320 A EP 02740320A EP 1390959 B1 EP1390959 B1 EP 1390959B1
Authority
EP
European Patent Office
Prior art keywords
magnet arrangement
arrangement according
armature
displacement sensor
closure
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 - Fee Related
Application number
EP02740320A
Other languages
German (de)
French (fr)
Other versions
EP1390959A2 (en
Inventor
Klaus HÖFLING
Hans-Georg Schubert
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.)
Bosch Rexroth AG
Original Assignee
Bosch Rexroth AG
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 Bosch Rexroth AG filed Critical Bosch Rexroth AG
Publication of EP1390959A2 publication Critical patent/EP1390959A2/en
Application granted granted Critical
Publication of EP1390959B1 publication Critical patent/EP1390959B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1684—Armature position measurement using coils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator
    • Y10T137/8242—Electrical

Definitions

  • the invention relates to a magnet arrangement for an electromechanical drive, in particular for a fluidic valve, according to the preamble of claim 1.
  • Such a magnet assembly is as part of a hydraulic directional control valve from the publication "Novel, cost-effective drives for proportional valves in fluid technology,” magazine “ O + P Oil Hydraulics and Pneumatics "43 (1999) No. 4, pages 252 to 258 known.
  • a control piston In the housing of a directional control valve, a control piston is mounted axially displaceable, which controls the size of the flowing over the directional control valve pressure medium flow.
  • a pole tube is screwed into the housing from both sides. Over each pole tube a coil is pushed.
  • a cylindrical armature is guided, which exerts a force deflecting the control piston when current is applied to the coil surrounding it.
  • the transducer Connected to the one armature is a position transducer which converts the position of the armature into an electrical output signal which is a measure of the position of the armature. Since the control piston of the directional control valve is non-positively coupled to the armature, the electrical output signal of the displacement sensor is also a measure of the position of the control piston.
  • the transducer has a fixed part in the form of a coil assembly and a movable part, the core. The core is held on a core carrier, which on the of the Control piston side facing away from the armature is held.
  • the pole tube is closed on the side of the displacement transducer by a closure member which is provided with an axial recess.
  • a pressure pipe is guided out of the pole tube to the outside.
  • the closure member and the pressure tube guided therethrough close the armature space pressure-tight to the outside.
  • the over the closure member in the axial direction protruding part of the pressure tube is concentrically surrounded by a coil assembly which forms the stationary part of the transducer.
  • the coil arrangement is arranged in a separate housing. This housing is held by a clamping bracket which engages in an outer annular groove of the closure member to the pole tube.
  • a toothing is provided which prevents rotation of the housing relative to the pole tube.
  • the core of the transducer moves in the area enclosed by the coil assembly portion of the pressure tube.
  • the housing of the stationary part of the transducer abuts against the coil and secures the coil in the axial direction.
  • This type of attachment of the coil is more expensive than the usual in a pole tube without transducer receptacle of the coil by a nut which engages in an external thread on the closure member, and increases the variety of parts.
  • the arrangement of the transducer in the axial extension of the pole tube makes the transducer provided with the directional control valve vulnerable to vibrations that can lead to tearing off the transducer in extreme cases.
  • a 2/2-way seat valve with an inductive displacement sensor for the guided in a pole tube armature of the actuating magnet is in the US-A-5,669,413 , which discloses a magnet arrangement according to the preamble of claim 1, described.
  • a closure member of the pole tube integrally continues into a pressure tube for receiving a sensor core. On the pressure tube, a sensor coil is pushed. The sensor coil is protected by a cover which surrounds the pressure tube and a part of the pole tube.
  • the US-A-4,833,352 describes an inductive displacement sensor for a fuel injection pump.
  • the movement of a piston guided in a piston bore is detected.
  • a coil support - also made of plastic - used.
  • the bobbin protrudes from the cover part inwards into the piston bore.
  • a pin with sensor core protrudes into a cavity of the bobbin.
  • the bobbin is circumferentially surrounded by a sleeve liquid-tight.
  • the invention has for its object to provide a magnet assembly of the type mentioned, in which the Risk of damage due to vibration is significantly reduced.
  • FIG. 1 shows a section through a magnet assembly 10 with a pole tube 11, a guided in the pole tube 11 anchor 12 and a closure member 13.
  • the pole tube 11 is screwed into a housing 14 only schematically shown a fluidic valve.
  • a plunger 15 is formed on the housing 14 side facing, which deflects a control piston of the valve, not shown here.
  • the magnetic coil 16 is between the housing 14 and a nut 17, in an external thread 18 of the closure member 13 engages, held.
  • a spring 19 is arranged between the armature 12 and the closure member 13, a spring 19 is arranged. The spring 19 ensures a defined position of the armature 12 when the magnetic coil 16 is not energized.
  • the spring 19 may be omitted if otherwise provided for a defined position of the armature 12 with de-energized magnetic coil 16. If the magnetic coil 16 is energized, the armature 12 is deflected accordingly.
  • On the closure member 13 facing side of the armature 12 is provided with a core 20 core holder 21 is arranged.
  • the core 20 forms the moving part of a displacement transducer.
  • the transducer converts the position of the armature 12 into an electrical signal which is a measure of the position of the armature 12.
  • the closure member 13 is provided with a recess 24 which is closed by a closure member 25. Details of the connection of the closure member 25 with the closure member 13 are not shown in detail. Both parts can z. B. are glued together.
  • a plug 26 is frontally integrated.
  • the closure member 25 is provided with a recess 27 which merges into the recess 24 of the closure member 13.
  • a coil arrangement comprising two secondary coils 28a and 28b and a primary coil 28c surrounding them forms, together with a carrier 36, the stationary part of the displacement transducer.
  • the carrier 36 with the coils 28a, 28b and 28c is disposed in the recess 24 of the closure member 13.
  • the coils 28 a and 28 b and 28 c are arranged concentrically with the core 20. Further details of the transducer are based on FIG. 2 described.
  • FIG. 2 shows a part of the in the FIG. 1 shown magnet assembly 10 in an enlarged view.
  • the collar 30 is supported on an armature 12 facing annular surface 31 of the closure member 13 from.
  • a circumferential weld 32 provides a pressure-tight connection between the collar 30 of the pressure tube 29 and the closure member 13. On the weld 32 can be omitted if between the collar 30 and the closure member 13 in other ways, a pressure-tight connection is made.
  • the free end of the pole tube 11 is crimped in a first annular groove 33 of the closure member 13.
  • a sealing ring 34 is disposed between the closure member 13 and the pole tube 11 in a further annular groove 35.
  • the solenoid 16 can be pushed onto the pole tube 11, the outer diameter d 18 of the external thread 18 is slightly smaller than the outer diameter d 11 of the pole tube 11 is selected.
  • the coil ends of the coils 28a, 28b and 28c arranged on the carrier 36 two coil ends, indicated at 37 and 38, are shown.
  • the winding ends 37, 38 are connected in the simplest case directly to pins 41, 42 of the connector 26. It is also possible, as in the FIG.
  • a printed circuit board 39 which is equipped with electrical components 44, 45 of an electrical evaluation circuit.
  • the winding ends 37, 38 are connected to the input of the evaluation circuit and the output of the evaluation circuit to the pins 41, 42.
  • FIG. 3 shows a further closure member 50 with a closure member 51.
  • the circuit board 39 is - as in the FIGS. 1 and 2 shown - held on the carrier 36 for the coils 28a, 28b and 28c of the stationary part of the displacement sensor.
  • the carrier 36 is pushed over a pressure tube 53 ', which in turn is held on the closure member 50.
  • the pressure tube 53 is provided with a collar 54.
  • the collar 54 is supported on the annular surface 31 of the closure member 50 from.
  • the collar 54 is provided on the armature 12 side facing with a recess 55 which serves as a guide for in the FIG. 1 illustrated spring 19 is formed.
  • the collar 54 is pressure-tightly connected to the closure member 50.
  • the circuit board 39 is provided with soldering points 57 and 58 to which the winding ends 37 and 38 are connected.
  • An electrical cable 60 is guided in the axial direction through the closure part 51. In the passage area, the cable 60 is surrounded by a spout 61.
  • a the extension part 51 extending tubular extension 62 is formed as an additional anti-buckling.
  • the individual lines 63, 64 of the cable 60 are connected to further solder points 65, 66 of the printed circuit board 39.
  • the soldering points 57, 58 are connected to the soldering points 65, 66.
  • the circuit board 39 with a through the electronic components 44, 45 shown schematically Evaluation circuit connected, whose input to the solder pads 57, 58 and whose output is connected to the solder pads 65, 66.
  • FIG. 4 shows a third closure member 67, in which a designed as a plate 68 closure member is bolted to the closure member 67.
  • the plug 26 is integrally formed with the terminal pins 41, 42.
  • the circuit board 39 is mechanically held on the terminal pins 41, 42.
  • the carrier 36 is held on the circuit board 39.
  • the unit formed from the plate 68, the terminal pins 41, 42, the circuit board 39 and the carrier 36 is pushed over the pressure tube 53.
  • the printed circuit board 39 with the schematically illustrated electrical components 44, 45 of an evaluation circuit is arranged in a recess 70 of the plate 68.
  • the winding ends 37, 38 of the coils 28a, 28b, 28c are connected to the input of the evaluation circuit.
  • the pins 41, 42 of the plug 26 are electrically connected to the output of the evaluation circuit.
  • the plate 68 is held on the closure member 67 by circumferentially distributed screws, of which in the FIG. 4 two screws 77, 78 are visible.
  • FIG. 5 shows a section along in the FIG. 4 shown line BB.
  • two additional screws 79 and 80 are visible in addition to the screws 77 and 78.
  • two further pins 81, 82 and two other electronic components 84, 85 are also visible.
  • FIG. 6 shows a further closure member 87.
  • the preparation of the closure part of the closure member 87 takes place - as described below - by casting with plastic.
  • the pressure tube 53 projects into the recess 24 of the closure member 87 and is pressure-tight connected to it.
  • the carrier 36 with the coils 28a, 28b, 28c is pushed over the pressure tube 53.
  • On the carrier 36 the circuit board 39 is held.
  • the pins 41, 42 are mechanically held on the circuit board 39.
  • This structure is used in a multi-part tool shown only schematically, which consists of a base plate 90, two mold halves 91 a, 91 b and an insert 92.
  • the mold halves 91a, 91b enclose a space 94 which determines the later shape of the closure part and of the molded-on connector.
  • the mold halves 91a, 91b are divided along a plane passing through the central axis of the closure member 87 level such that demolding of the closure member and plug provided closure member is possible.
  • the plastic mass can be evenly distributed in the form, are provided in the tool and / or in the closure member 87 in the usual way Steigerbohritch. they are in the FIG. 6 not shown.
  • FIG. 7 shows a closure member 100 to which a closure member 101 is connected via a screw connection.
  • the pressure tube 29 projects into the cylindrically shaped recess 24 of the closure part 100. It is supported by its collar 30 on the front side of the closure part 100 facing the armature of the magnet arrangement.
  • the recess 24 of the closure member 100 is provided with an internal thread 104 and the closure member 101 with a corresponding external thread 105.
  • the internal thread 104 of the closure member 100 and the external thread 105 of the closure member 101 form a screw, the rotational movement of the closure member 101 relative to the closure member 100 in an axial movement between the two parts transforms.
  • the printed circuit board 39 is held on the closing part 101.
  • the carrier 36 with the coils 28a, 28b and 28c, which form the stationary part of the transducer held.
  • the region of the terminating part 101, in which the carrier 36 with the coils 28a to 28c is located, is arranged within the recess 24 of the closure part 100.
  • the carrier 36 encloses the pressure tube 29 concentrically. The distance between the pressure tube 29 and the carrier 36 is selected so that the carrier 36 can be moved with little play relative to the pressure tube 29.
  • a counter nut 108 provided with an internal thread 107 is screwed, which in the operation of the displacement transducer an unintentional rotation of the closure part 101 against prevents the closure member 100.
  • the lock nut 108 is screwed against the closure member 100, with its internal thread 107 is supported on the external thread 105 of the closure member 101 and provided with the reference numeral 110 end face on the closure member 100th At the end facing away from the closure member 100 of the end portion 101 of the plug 26 with the pins 41, 42 is formed.
  • the position of the core 20, which forms the movable part of the transducer is shown in dashed lines.
  • the axial distance between the stationary and the movable part of the transducer can be changed.
  • the terms “stationary part” and “movable part” of the transducer refer to the operation of the transducer, in which the armature of the magnet assembly moves the core 20 and the carrier 36 is fixedly arranged with the coils 28a to 28c with respect to the valve housing.
  • the core is held in a position fixed to the valve housing and the closure member 101 so long against the closure member 100 and thus against the valve housing rotated until the voltage applied to the pins 41, 42 electrical output signal has reached a desired value , This situation is secured as described above by tightening the lock nut 108 against unintentional rotation.
  • closure member and closure member allows, if necessary, a zero shift of the electrical output signal to mechanical To make ways.
  • a zero shift can be z. B. correct manufacturing tolerances with respect to the axial position of the stationary part of the transducer.
  • switching signals can be generated from the continuous output signal of the displacement transducer, which signals the reaching of positions of the control piston of a directional control valve determined by the threshold values.
  • the combination of the electrical signals can be both outside of the closure member and within the closure member, z. B. by the arrangement of additional electronic components on the circuit board 39 done.
  • the switching signals are available in addition to the continuous output signal of the transducer and can be further processed independently of each other in facilities for control and / or monitoring.

Abstract

The invention relates to a magnet arrangement for an electromechanical drive comprising a cylindrical armature guided in a pole tube, whereby the position of the armature is transformed into an electric signal. A displacement sensor with a fixed and a mobile part is connected to the armature. One side of the armature is embodied in such a way that it transfers the movement of the armature. The other side of the armature is connected to the moveable part of the displacement sensor. The pole tube is provided with a closure part on the side of the displacement sensor. A pressure tube is guided in an outward direction through an axial recess of the closure part. The moveable part of the displacement sensor moves in the pressure tube. The pressure tube is enclosed by the fixed part of the displacement sensor. In order to prevent the displacement sensor from being damaged by vibrations, the fixed part of the displacement sensor is arranged in a recess of the closure part. Magnet arrangements of said variety are, preferably, used for electric re-positioning in liquid valves.

Description

Die Erfindung betrifft eine Magnetanordnung für einen elektromechanischen Antrieb, insbesondere für ein fluidisches Ventil, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a magnet arrangement for an electromechanical drive, in particular for a fluidic valve, according to the preamble of claim 1.

Eine derartige Magnetanordnung ist als Bestandteil eines hydraulischen Wegeventils aus der Veröffentlichung "Neuartige, kostengünstige Antriebe für Proportionalventile in der Fluidtechnik", Zeitschrift " O+P Ölhydraulik und Pneumatik" 43(1999)Nr. 4, Seiten 252 bis 258 bekannt. In dem Gehäuse eines Wegeventils ist ein Steuerkolben axial verschiebbar gelagert, der die Größe des über das Wegeventil fließenden Druckmittelstroms steuert. In axialer Verlängerung des Steuerkolbens ist von beiden Seiten je ein Polrohr in das Gehäuse geschraubt. Über jedes Polrohr ist eine Spule geschoben. In jedem der beiden Polrohre ist ein zylinderförmigen Anker geführt, der bei Strombeaufschlagung der ihn umschlie-βenden Spule eine den Steuerkolben auslenkende Kraft ausübt. Mit dem einen Anker ist ein Wegaufnehmer verbunden, der die Position des Ankers in ein elektrisches Ausgangssignal umformt, das ein Maß für die Position des Ankers ist. Da der Steuerkolben des Wegeventils mit dem Anker kraftschlüssig gekoppelt ist, ist das elektrische Ausgangssignal des Wegaufnehmers auch ein Maß für die Position des Steuerkolbens. Der Wegaufnehmer besitzt einen ortsfesten Teil in Form einer Spulenanordnung und einen beweglichen Teil, den Kern. Der Kern ist an einem Kernträger gehalten, der auf der von dem Steuerkolben abgewandten Seite an dem Anker gehalten ist. Das Polrohr ist auf der Seite des Wegaufnehmers durch ein Verschlußteil abgeschlossen, das mit einer axialen Ausnehmung versehen ist. Durch diese Ausnehmung ist ein Druckrohr aus dem Polrohr nach außen geführt. Das Verschlußteil und das durch dieses hindurch geführten Druckrohr schließen den Ankerraum druckdicht nach außen ab. Der über das Verschlußteil in axialer Richtung hinausragende Teil des Druckrohrs ist von einer Spulenanordnung konzentrisch umschlossen, die den ortsfesten Teil des Wegaufnehmers bildet. Die Spulenanordnung ist in einem eigenen Gehäuse angeordnet. Dieses Gehäuse ist durch einen Klemmbügel, der in eine äußere Ringnut des Verschlußteils eingreift, an dem Polrohr gehalten. Zusätzlich ist eine Verzahnung vorgesehen, die eine Verdrehung des Gehäuses gegenüber dem Polrohr verhindert. Der Kern-des Wegaufnehmers bewegt sich in dem von der Spulenanordnung umschlossenen Bereich des Druckrohrs. Das Gehäuse des ortsfesten Teils des Wegaufnehmers liegt an der Spule an und sichert die Spule in axialer Richtung. Diese Art der Befestigung der Spule ist aufwendiger als die bei einem Polrohr ohne Wegaufnehmer übliche Befestigung der Spule durch eine Mutter, die in ein Außengewinde am Verschlußteil eingreift, und vergrößert die Teilevielfalt. Die Anordnung des Wegaufnehmers in axialer Verlängerung des Polrohrs macht das mit dem Wegaufnehmer versehene Wegeventil anfällig für Vibrationen, die im Extremfall zu einem Abreißen des Wegaufnehmers führen können.Such a magnet assembly is as part of a hydraulic directional control valve from the publication "Novel, cost-effective drives for proportional valves in fluid technology," magazine " O + P Oil Hydraulics and Pneumatics "43 (1999) No. 4, pages 252 to 258 known. In the housing of a directional control valve, a control piston is mounted axially displaceable, which controls the size of the flowing over the directional control valve pressure medium flow. In the axial extension of the control piston, a pole tube is screwed into the housing from both sides. Over each pole tube a coil is pushed. In each of the two pole tubes, a cylindrical armature is guided, which exerts a force deflecting the control piston when current is applied to the coil surrounding it. Connected to the one armature is a position transducer which converts the position of the armature into an electrical output signal which is a measure of the position of the armature. Since the control piston of the directional control valve is non-positively coupled to the armature, the electrical output signal of the displacement sensor is also a measure of the position of the control piston. The transducer has a fixed part in the form of a coil assembly and a movable part, the core. The core is held on a core carrier, which on the of the Control piston side facing away from the armature is held. The pole tube is closed on the side of the displacement transducer by a closure member which is provided with an axial recess. Through this recess, a pressure pipe is guided out of the pole tube to the outside. The closure member and the pressure tube guided therethrough close the armature space pressure-tight to the outside. The over the closure member in the axial direction protruding part of the pressure tube is concentrically surrounded by a coil assembly which forms the stationary part of the transducer. The coil arrangement is arranged in a separate housing. This housing is held by a clamping bracket which engages in an outer annular groove of the closure member to the pole tube. In addition, a toothing is provided which prevents rotation of the housing relative to the pole tube. The core of the transducer moves in the area enclosed by the coil assembly portion of the pressure tube. The housing of the stationary part of the transducer abuts against the coil and secures the coil in the axial direction. This type of attachment of the coil is more expensive than the usual in a pole tube without transducer receptacle of the coil by a nut which engages in an external thread on the closure member, and increases the variety of parts. The arrangement of the transducer in the axial extension of the pole tube makes the transducer provided with the directional control valve vulnerable to vibrations that can lead to tearing off the transducer in extreme cases.

Ein 2/2-Wegesitzventil mit einem induktiven Wegsensor für den in einem Polrohr geführten Anker des Betätigungsmagneten ist in der US-A-5 669 413 , die eine Magnetanordnung gemäß dem Oberbegriff des Anspruchs 1 offenbart, beschrieben. Ein Verschlussteil des Polrohrs setzt sich einstückig in ein Druckrohr zur Aufnahme eines Sensorkerns fort. Auf das Druckrohr ist eine Sensorspule aufgeschoben. Die Sensorspule ist durch einen Deckel, welcher das Druckrohr und einen Teil des Polrohrs umgreift geschützt.A 2/2-way seat valve with an inductive displacement sensor for the guided in a pole tube armature of the actuating magnet is in the US-A-5,669,413 , which discloses a magnet arrangement according to the preamble of claim 1, described. A closure member of the pole tube integrally continues into a pressure tube for receiving a sensor core. On the pressure tube, a sensor coil is pushed. The sensor coil is protected by a cover which surrounds the pressure tube and a part of the pole tube.

Die US-A-4 833 352 beschreibt einen induktiven Wegsensor für eine Kraftstoffeinspritzpumpe. Es wird die Bewegung eines in einer Kolbenbohrung geführten Kolbens erfasst. In ein Kunststoff-Deckelteil zum Abschließen der Kolbenbohrung ist ein Spulenträger - ebenfalls aus Kunststoff - eingesetzt. Der Spulenträger steht vom Deckelteil aus nach innen in die Kolbenbohrung vor. Ein Stift mit Sensorkern ragt in einen Hohlraum des Spulenträgers hinein. Der Spulenträger ist umfangsseitig von einer Hülse flüssigkeitsdicht umgegeben.The US-A-4,833,352 describes an inductive displacement sensor for a fuel injection pump. The movement of a piston guided in a piston bore is detected. In a plastic cover part for completing the piston bore, a coil support - also made of plastic - used. The bobbin protrudes from the cover part inwards into the piston bore. A pin with sensor core protrudes into a cavity of the bobbin. The bobbin is circumferentially surrounded by a sleeve liquid-tight.

Der Erfindung liegt die Aufgabe zugrunde, eine Magnetanordnung der eingangs genannten Art zu schaffen, bei der die Gefahr von Beschädigungen aufgrund von Vibrationen deutlich verringert ist.The invention has for its object to provide a magnet assembly of the type mentioned, in which the Risk of damage due to vibration is significantly reduced.

Diese Aufgabe wird durch das im Anspruch 1 gekennzeichnete Merkmal gelöst. Da der gesamte Wegaufnehmer innerhalb des Verschlußteils des Polrohrs angeordnet ist, ergibt sich ein sehr kompakter Aufbau der Magnetanordnung, bei der der Wegaufnehmer auch gegen mechanische Beschädigung geschützt ist. Für den ortsfesten Teil des Wegaufnehmers ist kein gesondertes Gehäuses erforderlich. Zudem entfallen Maßnahmen für die Befestigung eines derartigen Gehäuses an dem Polrohr. Die den ortsfesten Teil des Wegaufnehmers enthaltenden Verschlußteile können für sich allein gefertigt und geprüft werden.This object is achieved by the feature characterized in claim 1. Since the entire displacement sensor is arranged within the closure part of the pole tube, results in a very compact construction of the magnet assembly, in which the transducer is also protected against mechanical damage. For the fixed part of the transducer no separate housing is required. In addition, eliminates measures for the attachment of such a housing to the pole tube. The closure parts containing the stationary part of the transducer can be manufactured and tested by itself.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet. Sie umfassen konstruktive Einzelheiten der Magnetanordnung, insbesondere solche, die eine einfache Anordnung der elektronischen Bauteile einer Schaltungsanordnung zum Auswerten der Ausgangssignale des Wegaufnehmers sowie einen einfachen Anschluß von externen elektrischen Leitungen erlauben. Die Unteransprüche umfassen auch konstruktive Maßnahmen, die die Ausgestaltung des Verschlußteils des Polrohrs betreffen.Advantageous developments of the invention are characterized in the subclaims. They comprise structural details of the magnet arrangement, in particular those which permit a simple arrangement of the electronic components of a circuit arrangement for evaluating the output signals of the position sensor and a simple connection of external electrical lines. The dependent claims also include constructive measures that relate to the configuration of the closure member of the pole tube.

Die Erfindung wird im folgenden mit ihren weiteren Einzelheiten anhand von in den Zeichnungen dargestellten Ausführungsbeispielen näher erläutert. Es zeigen

Figur 1
einen Schnitt durch eine erfindungsgemäß ausgebildete Magnetanordnung,
Figur 2
den Bereich des Verschlußteils der in der Figur 1 dargestellten Magnetanordnung in vergrößerter Darstellung,
Figur 3
einen Schnitt durch ein weiteres Verschlußteil mit Abschlußteil für eine erfindungsgemäße Magnetanordnung,
Figur 4
einen Schnitt durch ein drittes Verschlußteil mit Abschlußteil für eine erfindungsgemäße Magnetanordnung,
Figur 5
einen Schnitt durch das in der Figur 4 dargestellte Abschlußteil,
Figur 6
einen Schnitt durch ein viertes Verschlußteil für eine erfindungsgemäße Magnetanordnung und
Figur 7
einen Schnitt durch ein weiteres Verschlußteil mit Abschlußteil, wobei das Verschlußteil und das Abschlußteil über einen Gewindetrieb miteinander verbunden sind.
The invention will be explained in more detail below with its further details with reference to embodiments shown in the drawings. Show it
FIG. 1
a section through a magnet arrangement according to the invention,
FIG. 2
the area of the closure part in the FIG. 1 shown magnet arrangement in an enlarged view,
FIG. 3
a section through a further closure part with a closing part for a magnet arrangement according to the invention,
FIG. 4
a section through a third closure member with a closing part for a magnet arrangement according to the invention,
FIG. 5
a cut through that in the FIG. 4 illustrated conclusion part,
FIG. 6
a section through a fourth closure member for a magnet assembly according to the invention and
FIG. 7
a section through a further closure part with the closure part, wherein the closure part and the closure part are connected to each other via a screw drive.

Gleiche Bauteile sind in den Figuren mit den gleichen Bezugszeichen versehen.Identical components are provided in the figures with the same reference numerals.

Die Figur 1 zeigt einen Schnitt durch eine Magnetanordnung 10 mit einem Polrohr 11, einem in dem Polrohr 11 geführten Anker 12 und einem Verschlußteil 13. Das Polrohr 11 ist in ein nur schematisch dargestelltes Gehäuse 14 eines fluidischen Ventils geschraubt. An den Anker 12 ist auf der dem Gehäuse 14 zugewandten Seite ein Stößel 15 angeformt, der einen hier nicht dargestellten Steuerkolben des Ventils auslenkt. Eine nur schematisch dargestellte Magnetspule 16 umschließt das Polrohr 11. Die Magnetspule 16 ist zwischen dem Gehäuse 14 und einer Mutter 17, die in ein Außengewinde 18 des Verschlußteils 13 eingreift, gehalten. Zwischen dem Anker 12 und dem Verschlußteil 13 ist eine Feder 19 angeordnet. Die Feder 19 sorgt für eine definierte Lage des Ankers 12, wenn die Magnetspule 16 nicht bestromt ist. Die Feder 19 kann entfallen, wenn auf andere Weise für eine definierte Lage des Ankers 12 bei unbestromter Magnetspule 16 gesorgt ist. Wird die Magnetspule 16 bestromt, wird der Anker 12 entsprechend ausgelenkt. Auf der dem Verschlußteil 13 zugewandten Seite des Ankers 12 ist ein mit einem Kern 20 versehener Kernhalter 21 angeordnet. Der Kern 20 bildet den beweglichen Teil eines Wegaufnehmers. Der Wegaufnehmer formt die Position des Ankers 12 in ein elektrisches Signal um, das ein Maß für die Position des Ankers 12 ist. Das Verschlußteil 13 ist mit einer Ausnehmung 24 versehen, die durch ein Abschlußteil 25 verschlossen ist. Einzelheiten der Verbindung des Abschlußteils 25 mit dem Verschlußteil 13 sind nicht im Einzelnen dargestellt. Beide Teile können z. B. miteinander verklebt werden. In das Abschlußteil 25 ist stirnseitig ein Stecker 26 integriert. Das Abschlußteil 25 ist mit einer Ausnehmung 27 versehen, die in die Ausnehmung 24 des Verschlußteils 13 übergeht. Eine aus zwei Sekundärspulen 28a und 28b sowie einer diese umgebenden Primärspulen 28c bestehende Spulenanordnung bildet zusammen mit einem Träger 36 den ortsfesten Teil des Wegaufnehmers. Der Träger 36 mit den Spulen 28a, 28b und 28c ist in der Ausnehmung 24 des Verschlußteils 13 angeordnet. Die Spulen 28a und 28b sowie 28c sind konzentrisch zu dem Kern 20 angeordnet. Weitere Einzelheiten des Wegaufnehmers sind anhand der Figur 2 beschrieben.The FIG. 1 shows a section through a magnet assembly 10 with a pole tube 11, a guided in the pole tube 11 anchor 12 and a closure member 13. The pole tube 11 is screwed into a housing 14 only schematically shown a fluidic valve. At the armature 12, a plunger 15 is formed on the housing 14 side facing, which deflects a control piston of the valve, not shown here. A magnetic coil 16 shown only schematically surrounds the pole tube 11. The magnetic coil 16 is between the housing 14 and a nut 17, in an external thread 18 of the closure member 13 engages, held. Between the armature 12 and the closure member 13, a spring 19 is arranged. The spring 19 ensures a defined position of the armature 12 when the magnetic coil 16 is not energized. The spring 19 may be omitted if otherwise provided for a defined position of the armature 12 with de-energized magnetic coil 16. If the magnetic coil 16 is energized, the armature 12 is deflected accordingly. On the closure member 13 facing side of the armature 12 is provided with a core 20 core holder 21 is arranged. The core 20 forms the moving part of a displacement transducer. The transducer converts the position of the armature 12 into an electrical signal which is a measure of the position of the armature 12. The closure member 13 is provided with a recess 24 which is closed by a closure member 25. Details of the connection of the closure member 25 with the closure member 13 are not shown in detail. Both parts can z. B. are glued together. In the end part 25, a plug 26 is frontally integrated. The closure member 25 is provided with a recess 27 which merges into the recess 24 of the closure member 13. A coil arrangement comprising two secondary coils 28a and 28b and a primary coil 28c surrounding them forms, together with a carrier 36, the stationary part of the displacement transducer. The carrier 36 with the coils 28a, 28b and 28c is disposed in the recess 24 of the closure member 13. The coils 28 a and 28 b and 28 c are arranged concentrically with the core 20. Further details of the transducer are based on FIG. 2 described.

Die Figur 2 zeigt einen Ausschnitt aus der in der Figur 1 dargestellten Magnetanordnung 10 in vergrößerter Darstellung. Bauteile, die oben bereits beschrieben worden sind, werden im Zusammenhang mit der Figur 2 nicht noch einmal beschrieben. Ein einseitig geschlossenes Druckrohr 29, das an seinem offenen Ende mit einem Kragen 30 versehen ist, ragt in die Ausnehmung 24 des Verschlußteils 13 hinein. Der Kragen 30 stützt sich an einer dem Anker 12 zugewandten Ringfläche 31 des Verschlußteils 13 ab. Eine umlaufende Schweißnaht 32 sorgt für eine druckdichte Verbindung zwischen dem Kragen 30 des Druckrohrs 29 und dem Verschlußteil 13. Auf die Schweißnaht 32 kann verzichtet werden, wenn zwischen dem Kragen 30 und dem Verschlußteil 13 auf andere Weise eine druckdichte Verbindung hergestellt ist. Alternativ hierzu ist es möglich, Verschlußteil und Druckrohr einstückig auszuführen. Das freie Ende des Polrohrs 11 ist in eine erste Ringnut 33 des Verschlußteils 13 gebördelt. Ein Dichtring 34 ist zwischen dem Verschlußteil 13 und dem Polrohr 11 in einer weiteren Ringnut 35 angeordnet. Damit die Magnetspule 16 auf das Polrohr 11 geschoben werden kann, ist der Außendurchmesser d18 des Außengewindes 18 geringfügig kleiner als der Außendurchmesser d11 des Polrohrs 11 gewählt. Von den Wicklungsenden der auf dem Träger 36 angeordneten Spulen 28a, 28b und 28c sind zwei Wicklungsenden, die mit 37 und 38 bezeichnet sind, dargestellt. Die Wicklungsenden 37, 38 sind im einfachsten Fall direkt mit Anschlußstiften 41, 42 des Steckers 26 verbunden. Es ist auch möglich, wie in der Figur 2 schematisch dargestellt, an den Anschlußstiften 41, 42 des Steckers 26 eine Leiterplatte 39 zu halten, die mit elektrischen Bauteilen 44, 45 einer elektrischen Auswertungsschaltung bestückt ist. In diesem Fall sind die Wicklungsenden 37, 38 mit dem Eingang der Auswertungsschaltung und der Ausgang der Auswertungsschaltung mit den Anschlußstiften 41, 42 verbunden.The FIG. 2 shows a part of the in the FIG. 1 shown magnet assembly 10 in an enlarged view. Components that have already been described above, in connection with the FIG. 2 not described again. A unilaterally closed pressure tube 29, which is provided at its open end with a collar 30, projects into the recess 24 of the closure part 13. The collar 30 is supported on an armature 12 facing annular surface 31 of the closure member 13 from. A circumferential weld 32 provides a pressure-tight connection between the collar 30 of the pressure tube 29 and the closure member 13. On the weld 32 can be omitted if between the collar 30 and the closure member 13 in other ways, a pressure-tight connection is made. Alternatively, it is possible to perform closure member and pressure tube in one piece. The free end of the pole tube 11 is crimped in a first annular groove 33 of the closure member 13. A sealing ring 34 is disposed between the closure member 13 and the pole tube 11 in a further annular groove 35. Thus, the solenoid 16 can be pushed onto the pole tube 11, the outer diameter d 18 of the external thread 18 is slightly smaller than the outer diameter d 11 of the pole tube 11 is selected. Of the coil ends of the coils 28a, 28b and 28c arranged on the carrier 36, two coil ends, indicated at 37 and 38, are shown. The winding ends 37, 38 are connected in the simplest case directly to pins 41, 42 of the connector 26. It is also possible, as in the FIG. 2 shown schematically, to hold at the terminal pins 41, 42 of the connector 26, a printed circuit board 39 which is equipped with electrical components 44, 45 of an electrical evaluation circuit. In this case the winding ends 37, 38 are connected to the input of the evaluation circuit and the output of the evaluation circuit to the pins 41, 42.

Die Figur 3 zeigt ein weiteres Verschlußteil 50 mit einem Abschlußteil 51. Die Leiterplatte 39 ist - wie in den Figuren 1 und 2 dargestellt - an dem Träger 36 für die Spulen 28a, 28b und 28c des ortsfesten Teils des Wegaufnehmers gehalten. Der Träger 36 ist über ein Druckrohr 53 geschoben,' das seinerseits an dem Verschlußteil 50 gehalten ist. Das Druckrohr 53 ist mit einem Kragen 54 versehen. Der Kragen 54 stützt sich an der Ringfläche 31 des Verschlußteils 50 ab. Der Kragen 54 ist auf der dem Anker 12 zugewandten Seite mit einer Ausnehmung 55 versehen, die als Führung für die in der Figur 1 dargestellte Feder 19 ausgebildet ist. Durch eine umlaufende Schweißnaht 32 ist der Kragen 54 druckdicht mit dem Verschlußteil 50 verbunden. Die Leiterplatte 39 ist mit Lötpunkten 57 und 58 versehen, mit denen die Wicklungsenden 37 und 38 verbunden sind. Ein elektrisches Kabel 60 ist in axialer Richtung durch das Abschlußteil 51 geführt. Im Durchgangsbereich ist das Kabel 60 von einer Tülle 61 umgeben. An das Abschlußteil 51 ist als zusätzlicher Knickschutz ein das Abschlußteil 51 verlängernder rohrförmiger Fortsatz 62 angeformt. Die einzelnen Leitungen 63, 64 des Kabels 60 sind mit weiteren Lötpunkten 65, 66 der Leiterplatte 39 verbunden. Im einfachsten Fall, d. h. wenn keine Auswertungsschaltung vorgesehen ist, sind die Lötpunkte 57, 58 mit den Lötpunkten 65, 66 verbunden. In dem in der Figur 3 dargestellten Ausführungsbeispiel ist die Leiterplatte 39 mit einer durch die elektronischen Bauelemente 44, 45 schematisch dargestellten Auswertungsschaltung verbunden, deren Eingang mit den Lötpunkten 57, 58 und deren Ausgang mit den Lötpunkten 65, 66 verbunden ist.The FIG. 3 shows a further closure member 50 with a closure member 51. The circuit board 39 is - as in the FIGS. 1 and 2 shown - held on the carrier 36 for the coils 28a, 28b and 28c of the stationary part of the displacement sensor. The carrier 36 is pushed over a pressure tube 53 ', which in turn is held on the closure member 50. The pressure tube 53 is provided with a collar 54. The collar 54 is supported on the annular surface 31 of the closure member 50 from. The collar 54 is provided on the armature 12 side facing with a recess 55 which serves as a guide for in the FIG. 1 illustrated spring 19 is formed. By a circumferential weld 32, the collar 54 is pressure-tightly connected to the closure member 50. The circuit board 39 is provided with soldering points 57 and 58 to which the winding ends 37 and 38 are connected. An electrical cable 60 is guided in the axial direction through the closure part 51. In the passage area, the cable 60 is surrounded by a spout 61. At the end part 51, a the extension part 51 extending tubular extension 62 is formed as an additional anti-buckling. The individual lines 63, 64 of the cable 60 are connected to further solder points 65, 66 of the printed circuit board 39. In the simplest case, ie if no evaluation circuit is provided, the soldering points 57, 58 are connected to the soldering points 65, 66. In the in the FIG. 3 illustrated embodiment, the circuit board 39 with a through the electronic components 44, 45 shown schematically Evaluation circuit connected, whose input to the solder pads 57, 58 and whose output is connected to the solder pads 65, 66.

Die Figur 4 zeigt ein drittes Verschlußteil 67, bei dem ein als Platte 68 ausgebildetes Abschlußteil mit dem Verschlußteil 67 verschraubt ist. An die Platte 68 ist der Stecker 26 mit den Anschlußstiften 41, 42 angeformt. Die Leiterplatte 39 ist an den Anschlußstiften 41, 42 mechanisch gehalten. Wie in der Figur 2 dargestellt, ist der Träger 36 an der Leiterplatte 39 gehalten. Die aus der Platte 68, den Anschlußstiften 41, 42, der Leiterplatte 39 und dem Träger 36 gebildete Einheit ist über das Druckrohr 53 geschoben. Die Leiterplatte 39 mit den schematisch dargestellten elektrischen Bauteilen 44, 45 einer Auswertungsschaltung ist in einer Ausnehmung 70 der Platte 68 angeordnet. Die Wicklungsenden 37, 38 der Spulen 28a, 28b, 28c sind mit dem Eingang der Auswertungsschaltung verbunden. Die Anschlußstifte 41, 42 des Steckers 26 sind elektrisch mit dem Ausgang der Auswertungsschaltung verbunden. Die Platte 68 ist an dem Verschlußteil 67 durch über den Umfang verteilte Schrauben gehalten, von denen in der Figur 4 zwei Schrauben 77, 78 sichtbar sind.The FIG. 4 shows a third closure member 67, in which a designed as a plate 68 closure member is bolted to the closure member 67. To the plate 68, the plug 26 is integrally formed with the terminal pins 41, 42. The circuit board 39 is mechanically held on the terminal pins 41, 42. Like in the FIG. 2 shown, the carrier 36 is held on the circuit board 39. The unit formed from the plate 68, the terminal pins 41, 42, the circuit board 39 and the carrier 36 is pushed over the pressure tube 53. The printed circuit board 39 with the schematically illustrated electrical components 44, 45 of an evaluation circuit is arranged in a recess 70 of the plate 68. The winding ends 37, 38 of the coils 28a, 28b, 28c are connected to the input of the evaluation circuit. The pins 41, 42 of the plug 26 are electrically connected to the output of the evaluation circuit. The plate 68 is held on the closure member 67 by circumferentially distributed screws, of which in the FIG. 4 two screws 77, 78 are visible.

Die Figur 5 zeigt einen Schnitt entlang der in der Figur 4 dargestellten Linie B-B. In dieser Darstellung sind zusätzlich zu den Schrauben 77 und 78 zwei weitere Schrauben 79 und 80 sichtbar. In diesem Schnitt sind außerdem zwei weitere Anschlußstifte 81, 82 sowie zwei weitere elektronische Bauelemente 84, 85 sichtbar.The FIG. 5 shows a section along in the FIG. 4 shown line BB. In this illustration, two additional screws 79 and 80 are visible in addition to the screws 77 and 78. In this section, two further pins 81, 82 and two other electronic components 84, 85 are also visible.

Die Figur 6 zeigt ein weiteres Verschlußteil 87. Die Herstellung des Abschlußteils des Verschlußteils 87 erfolgt - wie im Folgenden beschrieben - durch Vergießen mit Kunststoff. Das Druckrohr 53 ragt in die Ausnehmung 24 des Verschlußteils 87 und ist druckdicht mit ihm verbunden. Der Träger 36 mit den Spulen 28a, 28b, 28c ist über das Druckrohr 53 geschoben. An dem Träger 36 ist die Leiterplatte 39 gehalten. Die Anschlußstifte 41, 42 sind mechanisch an der Leiterplatte 39 gehalten. Dieses Gebilde ist in ein nur schematisch dargestelltes mehrteiliges Werkzeug eingesetzt, das aus einer Grundplatte 90, zwei Formhälften 91a, 91b und einem Einsatz 92 besteht. Zusammen mit dem Einsatz 92 umschließen die Formhälften 91a, 91b einen Raum 94, der die spätere Form des Abschlußteils und des an dieses angeformten Steckers bestimmt. Die Formhälften 91a, 91b sind entlang einer durch die Mittelachse des Verschlußteils 87 verlaufenden Ebene derart geteilt, daß ein Entformen des mit Abschlußteil und Stecker versehenen Verschlußteils möglich ist. Über einen nur schematisch dargestellten Kanal 95 werden der Raum 94 und die Ausnehmung 24 beim Vergießen mit flüssigem Kunststoff gefüllt. Damit sich die Kunststoffmasse gleichmäßig in der Form verteilen kann, sind in dem Werkzeug und/oder in dem Verschlußteil 87 in üblicher Weise Steigerbohrungen vorgesehen. Sie sind in der Figur 6 nicht dargestellt. Da der Kunststoff auch elektrische Schaltungsteile berührt, ist es erforderlich, für das Abschlußteil einen elektrisch isolierenden Kunststoff zu verwenden. Zum Entformen des mit Abschlußteil und Stecker versehenen Verschlußteils 87 werden nach dem Erstarren der Kunststoffmasse die Formhälften 91a und 91b seitlich auseinandergezogen und der Einsatz 92 nach oben herausgezogen.The FIG. 6 shows a further closure member 87. The preparation of the closure part of the closure member 87 takes place - as described below - by casting with plastic. The pressure tube 53 projects into the recess 24 of the closure member 87 and is pressure-tight connected to it. The carrier 36 with the coils 28a, 28b, 28c is pushed over the pressure tube 53. On the carrier 36, the circuit board 39 is held. The pins 41, 42 are mechanically held on the circuit board 39. This structure is used in a multi-part tool shown only schematically, which consists of a base plate 90, two mold halves 91 a, 91 b and an insert 92. Together with the insert 92, the mold halves 91a, 91b enclose a space 94 which determines the later shape of the closure part and of the molded-on connector. The mold halves 91a, 91b are divided along a plane passing through the central axis of the closure member 87 level such that demolding of the closure member and plug provided closure member is possible. Via a channel 95 shown only schematically, the space 94 and the recess 24 are filled during pouring with liquid plastic. Thus, the plastic mass can be evenly distributed in the form, are provided in the tool and / or in the closure member 87 in the usual way Steigerbohrungen. they are in the FIG. 6 not shown. Since the plastic also touches electrical circuit parts, it is necessary to use an electrically insulating plastic for the final part. For demolding of the closing part 87 provided with the closure part and plug, after the solidification of the plastic compound, the mold halves 91a and 91b are pulled apart laterally and the insert 92 is pulled upwards.

Die Figur 7 zeigt ein Verschlußteil 100, mit dem ein Abschlußteil 101 über eine Schraubverbindung verbunden ist. Soweit in der Figur 7 Einzelheiten dargestellt sind, die bereits im Zusammenhang mit vorhergehenden Figuren beschrieben worden sind, werden für die entsprechenden Bauteile im Folgenden dieselben Bezugszeichen wie in den vorhergehenden Figuren verwendet. Das Druckrohr 29 ragt in die zylinderförmig ausgestaltete Ausnehmung 24 des Verschlußteils 100. Es stützt sich mit seinem Kragen 30 an der dem Anker der Magnetanordnung zugewandten Stirnseite des Verschlußteils 100 ab. Die Ausnehmung 24 des Verschlußteils 100 ist mit einem Innengewinde 104 versehen und das Abschlußteil 101 mit einem entsprechenden Außengewinde 105. Das Innengewinde 104 des Verschlußteils 100 und das Außengewinde 105 des Abschlußteils 101 bilden einen Gewindetrieb, der eine Drehbewegung des Abschlußteils 101 gegenüber dem Verschlußteil 100 in eine axiale Bewegung zwischen den beiden Teilen umformt. Die Leiterplatte 39 ist an dem Abschlußteil 101 gehalten. An der Leiterplatte 39 sind der Träger 36 mit den Spulen 28a, 28b und 28c, die den ortsfesten Teil des Wegaufnehmers bilden, gehalten. Der Bereich des Abschlußteils 101, in dem sich der Träger 36 mit den Spulen 28a bis 28c befindet, ist innerhalb der Ausnehmung 24 des Verschlußteils 100 angeordnet. Der Träger 36 umschließt das Druckrohr 29 konzentrisch. Der Abstand zwischen dem Druckrohr 29 und dem Träger 36 ist so gewählt, daß sich der Träger 36 mit geringem Spiel gegenüber dem Druckrohr 29 bewegen läßt. Auf das Außengewinde 105 des Abschlußteils 101 ist eine mit einem Innengewinde 107 versehene Kontermutter 108 geschraubt, die im Betrieb des Wegaufnehmers eine unbeabsichtigte Verdrehung des Abschlußteils 101 gegenüber dem Verschlußteil 100 verhindert. Um die relative Lage des Abschlußteils 101 gegenüber dem Verschlußteil 100 zu sichern, wird die Kontermutter 108 gegen das Verschlußteil 100 geschraubt, wobei sich ihr Innengewinde 107 an dem Außengewinde 105 des Abschlußteils 101 abstützt und die mit dem Bezugszeichen 110 versehene Stirnfläche an dem Verschlußteil 100. An das von dem Verschlußteil 100 abgewandte Ende des Abschlußteils 101 ist der Stecker 26 mit den Anschlußstiften 41, 42 angeformt. Die Lage des Kerns 20, der den beweglichen Teil des Wegaufnehmers bildet, ist mit Strichlinien dargestellt. Durch Drehen des Abschlußteils 101 gegenüber dem Verschlußteil 100 läßt sich der axiale Abstand zwischen dem ortsfesten und dem beweglichen Teil des Wegaufnehmers verändern. Die Begriffe "ortsfester Teil" und "beweglicher Teil" des Wegaufnehmers beziehen sich auf den Betrieb des Wegaufnehmers, bei dem der Anker der Magnetanordnung den Kern 20 bewegt und der Träger 36 mit den Spulen 28a bis 28c bezüglich des Ventilgehäuses ortsfest angeordnet ist. Um den Wegaufnehmer zu justieren, wird der Kern in einer zu dem Ventilgehäuse ortsfesten Lage gehalten und das Abschlußteil 101 so lange gegenüber dem Verschlußteil 100 und damit gegenüber dem Ventilgehäuse gedreht, bis das an den Anschlußstiften 41, 42 anstehende elektrische Ausgangssignal einen gewünschten Wert angenommen hat. Diese Lage wird wie oben beschrieben durch Anziehen der Kontermutter 108 gegen eine unbeabsichtigte Verdrehung gesichert.The FIG. 7 shows a closure member 100 to which a closure member 101 is connected via a screw connection. As far as in the FIG. 7 Details are shown, which have already been described in connection with previous figures, the same reference numerals are used for the corresponding components in the following as in the preceding figures. The pressure tube 29 projects into the cylindrically shaped recess 24 of the closure part 100. It is supported by its collar 30 on the front side of the closure part 100 facing the armature of the magnet arrangement. The recess 24 of the closure member 100 is provided with an internal thread 104 and the closure member 101 with a corresponding external thread 105. The internal thread 104 of the closure member 100 and the external thread 105 of the closure member 101 form a screw, the rotational movement of the closure member 101 relative to the closure member 100 in an axial movement between the two parts transforms. The printed circuit board 39 is held on the closing part 101. On the circuit board 39, the carrier 36 with the coils 28a, 28b and 28c, which form the stationary part of the transducer, held. The region of the terminating part 101, in which the carrier 36 with the coils 28a to 28c is located, is arranged within the recess 24 of the closure part 100. The carrier 36 encloses the pressure tube 29 concentrically. The distance between the pressure tube 29 and the carrier 36 is selected so that the carrier 36 can be moved with little play relative to the pressure tube 29. On the external thread 105 of the closure part 101, a counter nut 108 provided with an internal thread 107 is screwed, which in the operation of the displacement transducer an unintentional rotation of the closure part 101 against prevents the closure member 100. In order to secure the relative position of the closure member 101 relative to the closure member 100, the lock nut 108 is screwed against the closure member 100, with its internal thread 107 is supported on the external thread 105 of the closure member 101 and provided with the reference numeral 110 end face on the closure member 100th At the end facing away from the closure member 100 of the end portion 101 of the plug 26 with the pins 41, 42 is formed. The position of the core 20, which forms the movable part of the transducer is shown in dashed lines. By turning the closure member 101 relative to the closure member 100, the axial distance between the stationary and the movable part of the transducer can be changed. The terms "stationary part" and "movable part" of the transducer refer to the operation of the transducer, in which the armature of the magnet assembly moves the core 20 and the carrier 36 is fixedly arranged with the coils 28a to 28c with respect to the valve housing. In order to adjust the transducer, the core is held in a position fixed to the valve housing and the closure member 101 so long against the closure member 100 and thus against the valve housing rotated until the voltage applied to the pins 41, 42 electrical output signal has reached a desired value , This situation is secured as described above by tightening the lock nut 108 against unintentional rotation.

Die anhand der Figur 7 beschriebene Ausgestaltung von Verschlußteil und Abschlußteil erlaubt es, bei Bedarf eine Nullpunktverschiebung des elektrischen Ausgangssignals auf mechanischem Wege vorzunehmen. Mit einer derartigen Nullpunktverschiebung lassen sich z. B. fertigungsbedingte Toleranzen hinsichtlich der axialen Position des ortsfesten Teils des Wegaufnehmers korrigieren. Darüber hinaus ist es auch möglich, durch eine axiale Verstellung des ortsfesten Teils des Wegaufnehmers gegenüber dem Verschlußteil den Bereich des elektrischen Ausgangssignals zu verändern, so daß sich z. B. anstelle eines Ausgangssignals, das sich zwischen einem negativen und einem positiven Maximalwert bewegt, ein elektrisches Ausgangssignal ergibt, das sich zwischen Null und einem positiven Maximalwert bzw. zwischen Null und einem negativen Maximalwert bewegt.The basis of the FIG. 7 described embodiment of closure member and closure member allows, if necessary, a zero shift of the electrical output signal to mechanical To make ways. With such a zero shift can be z. B. correct manufacturing tolerances with respect to the axial position of the stationary part of the transducer. In addition, it is also possible to change by an axial adjustment of the stationary part of the transducer relative to the closure member, the range of the electrical output signal, so that z. B. instead of an output signal that moves between a negative and a positive maximum value, an electrical output signal that moves between zero and a positive maximum value or between zero and a negative maximum value.

Durch Verknüpfung des elektrischen Ausgangssignals des Wegaufnehmers mit vorgebbaren Schwellenwerten in Form von elektrischen Signalen lassen sich aus dem stetigen Ausgangssignal des Wegaufnehmers bei Bedarf Schaltsignale erzeugen, die das Erreichen von durch die Schwellenwerte bestimmten Positionen des Steuerkolbens eines Wegeventils signalisieren. Die Verknüpfung der elektrischen Signale kann dabei sowohl außerhalb des Verschlußteils als auch innerhalb des Verschlußteils, z. B. durch die Anordnung von zusätzlichen elektronischen Bauteilen auf der Leiterplatte 39, erfolgen. Die Schaltsignale stehen zusätzlich zu dem stetigen Ausgangssignal des Wegaufnehmers zur Verfügung und können unabhängig von einander in Einrichtungen zur Steuerung und/oder Überwachung weiterverarbeitet werden.By linking the electrical output signal of the displacement transducer with predefinable threshold values in the form of electrical signals, switching signals can be generated from the continuous output signal of the displacement transducer, which signals the reaching of positions of the control piston of a directional control valve determined by the threshold values. The combination of the electrical signals can be both outside of the closure member and within the closure member, z. B. by the arrangement of additional electronic components on the circuit board 39 done. The switching signals are available in addition to the continuous output signal of the transducer and can be further processed independently of each other in facilities for control and / or monitoring.

Claims (16)

  1. Magnet arrangement for an electromechanical drive for a fluidic valve, having a cylindrical armature which is guided in a pole tube, and having a magnet coil which surrounds the pole tube, and having a displacement sensor which converts the position of the armature into an electrical signal and has a stationary part and a movable part, in which arrangement one side of the armature is designed to transmit the movement of the armature and the other side of the armature is connected to the movable part of the displacement sensor, with the pole tube being provided with a closure part (13; 50; 67; 87; 100) on the side of the displacement sensor, and with the movable part (20) of the displacement sensor being guided in a pressure tube (29; 53), characterized in that the pressure tube projects into a recess (24) in the closure part (13; 50; 67; 87; 100), and in that the stationary part (28a to 28c, 36; 28a to 28c, 69) of the displacement sensor is arranged in the recess (24).
  2. Magnet arrangement according to Claim 1, characterized in that a termination part (25; 51; 68) is held on the closure part (13; 50; 67; 87; 100).
  3. Magnet arrangement according to Claim 2, characterized in that electrical connection lines (63, 64) of the displacement sensor are guided through the termination part (51).
  4. Magnet arrangement according to Claim 2, characterized in that a plug (26) is integrated in the termination part (25; 68; 101).
  5. Magnet arrangement according to Claim 3 or Claim 4, characterized in that the termination part (25; 51; 68) is provided with a recess (27; 70) which merges with the recess (24) in the closure part (13; 50; 67).
  6. Magnet arrangement according to Claim 5, characterized in that a printed circuit board (39) is arranged in the recess (27; 70) in the termination part (25; 51; 68; 101).
  7. Magnet arrangement according to Claim 6, characterized in that the printed circuit board (39) is held on the terminal pins (41, 42) of the plug (26).
  8. Magnet arrangement according to one of Claims 1 to 7, characterized in that the pressure tube (29; 53) is provided with a collar (30; 54) which is supported on an annular face (31), which faces the armature (12), of the closure part (13; 50; 67; 87; 100).
  9. Magnet arrangement according to Claim 8, characterized in that the collar (54) is in the form of a guide (55) for a spring (19) which is arranged between the armature (12) and the closure part (50; 67; 87).
  10. Magnet arrangement according to one of the preceding claims, characterized in that the closure part (13; 50; 67; 87; 100) is provided with an external thread (18), the outside diameter (d18) of the said external thread being smaller than the outside diameter (d11) of the pole tube (11).
  11. Magnet arrangement according to one of Claims 2 to 10, characterized in that the termination part is composed of plastic and is injection-moulded onto the closure part (87).
  12. Magnet arrangement according to one of Claims 2 to 11, characterized in that the stationary part (28a to 28c, 36) of the displacement sensor is held on the termination part (101), and in that the termination part (101) can be adjusted in relation to the closure part (100) in the axial direction.
  13. Magnet arrangement according to Claim 12, characterized in that the termination part (101) is connected to the closure part (100) by means of a screw mechanism (104, 105).
  14. Magnet arrangement according to Claim 13, characterized in that the closure part (100) is provided with an internal thread (104), and the termination part (101) is provided with an external thread (105).
  15. Magnet arrangement according to one of Claims 12 to 14, characterized in that securing means (108) which prevent unintentional rotation of the termination part (101) in relation to the closure part (100) are provided.
  16. Magnet arrangement according to Claim 15, characterized in that the termination part (101) is provided with a check nut (108), the internal thread (107) of the said check nut being supported on the external thread (105) of the termination part (101), and that end face (110) of the said check nut which faces the closure part (100) being supported on the said closure part.
EP02740320A 2001-05-17 2002-05-08 Magnet arrangement Expired - Fee Related EP1390959B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10124007 2001-05-17
DE10124007 2001-05-17
PCT/DE2002/001652 WO2002093592A2 (en) 2001-05-17 2002-05-08 Magnet arrangement

Publications (2)

Publication Number Publication Date
EP1390959A2 EP1390959A2 (en) 2004-02-25
EP1390959B1 true EP1390959B1 (en) 2011-12-14

Family

ID=7685120

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02740320A Expired - Fee Related EP1390959B1 (en) 2001-05-17 2002-05-08 Magnet arrangement

Country Status (4)

Country Link
US (1) US7093613B2 (en)
EP (1) EP1390959B1 (en)
DE (1) DE10220405A1 (en)
WO (1) WO2002093592A2 (en)

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DE102009041159B4 (en) * 2009-09-14 2022-12-08 Magnet-Schultz Gmbh & Co. Kg Displacement sensor unit and arrangement with the displacement sensor unit
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DE202014102940U1 (en) * 2014-06-27 2014-07-23 Bürkert Werke GmbH Valve with a plunger and a sensor
DE102017121094A1 (en) * 2017-09-12 2019-03-14 Bürkert Werke GmbH & Co. KG Valve control head
DE102019104192A1 (en) * 2019-02-19 2020-08-20 Eto Magnetic Gmbh Magnetic actuator device, magnetically actuatable valve, method with the magnetic actuator device and method for producing the magnetic actuator device
CN112945426B (en) * 2021-01-29 2022-02-01 西南石油大学 Vibrating wire sensor and stress displacement testing method
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Also Published As

Publication number Publication date
DE10220405A1 (en) 2002-11-21
US20040129318A1 (en) 2004-07-08
US7093613B2 (en) 2006-08-22
WO2002093592A3 (en) 2003-02-20
WO2002093592A2 (en) 2002-11-21
EP1390959A2 (en) 2004-02-25

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