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EP1390959B1 - Ensemble magnetique - Google Patents

Ensemble magnetique 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 - Lifetime
Application number
EP02740320A
Other languages
German (de)
English (en)
Other versions
EP1390959A2 (fr
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/fr
Application granted granted Critical
Publication of EP1390959B1 publication Critical patent/EP1390959B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)

Abstract

L'invention concerne un ensemble magnétique pour entraînement électromécanique, comprenant un induit cylindrique guidé dans un tube polaire, la position de l'induit étant convertie en signal électrique. A cet effet, un capteur de déplacement composé d'une partie fixe et d'une partie mobile est relié à l'induit. Une face de l'induit est façonnée de manière à transmettre le mouvement de l'induit, l'autre face étant reliée à la partie mobile du capteur de déplacement. Le tube polaire est pourvu, côté capteur de déplacement, d'une pièce de fermeture. Un évidement axial disposé dans cette pièce de fermeture permet le passage d'un tube de pression vers l'extérieur. Dans ce tube de pression, qui est entouré d'un élément fixe du capteur de déplacement, se déplace la partie mobile du capteur de déplacement. Afin d'éviter un endommagement du capteur de déplacement par des vibrations, la partie fixe du capteur de déplacement est logée dans un évidement de la pièce de fermeture. Des ensembles magnétiques de ce type sont utilisés notamment pour le retour électrique en position sur des soupapes actionnées par un fluide.

Claims (16)

  1. Ensemble magnétique pour un entraînement électromécanique de soupape à fluide, avec une ancre en forme de cylindre guidée dans un tube polarisé et avec une bobine d'aimant entourant le tube polarisé et avec un détecteur de course transformant la position de l'ancre en un signal électrique qui comporte une partie fixe sur place et une partie mobile et dans lequel un côté de l'ancre est réalisé pour transmettre le mouvement de l'ancre et l'autre côté de l'ancre est relié à la partie mobile du détecteur de course, le tube polarisé étant pourvu, sur le côté du détecteur de course, d'une partie de fermeture (13 ; 50 ; 67 ; 87 ; 100) et la partie mobile (20) du détecteur de course étant guidée dans un tube de pression (29 ; 53), caractérisé en ce que le tube de pression ressort dans un évidement (24) de la partie de fermeture (13 ; 50 ; 67 ; 87 ; 100) et que la partie fixe sur place (28a à 28c, 36 ; 28a à 28c, 69) du détecteur de course est disposée dans l'évidement (24).
  2. Ensemble magnétique selon la revendication 1, caractérisé en ce qu'une partie de terminaison (25 ; 51 ; 68) est maintenue au niveau de la partie de fermeture (13 ; 50 ; 67 ; 87 ; 100).
  3. Ensemble magnétique selon la revendication 2, caractérisé en ce que les câbles de raccordement électriques (63, 64) du détecteur de course sont guidés à travers la partie de terminaison (51).
  4. Ensemble magnétique selon la revendication 2, caractérisé en ce qu'une fiche mâle (26) est intégrée dans la partie de terminaison (25 ; 68 ; 101).
  5. Ensemble magnétique selon la revendication 3 ou 4, caractérisé en ce que la partie de terminaison (25 ; 51 ; 68) est pourvue d'un évidement (27 ; 70) qui se transforme en l'évidement (24) de la partie de fermeture (13 ; 50 ; 67).
  6. Ensemble magnétique selon la revendication 5, caractérisé en ce qu'une plaque conductrice (39) est disposée dans l'évidement (27 ; 70) de la partie de terminaison (25 ; 51; 68; 101).
  7. Ensemble magnétique selon la revendication 6, caractérisé en ce que la plaque conductrice (39) est maintenue au niveau des tiges de raccordement (41, 42) de la fiche mâle (26).
  8. Ensemble magnétique selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le tube de pression (29 ; 53) est pourvu d'une collerette (30 ; 54) qui s'appuie contre une surface annulaire (31), orientée vers l'ancre (12), de la partie de fermeture (13 ; 50 ; 67 ; 87 ; 100).
  9. Ensemble magnétique selon la revendication 8, caractérisé en ce que la collerette (54) sert de guide (55) pour un ressort (19) disposé entre l'ancre (12) et la partie de fermeture (50 ; 67 ; 87).
  10. Ensemble magnétique selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie de fermeture (13 ; 50 ; 67 ; 87 ; 100) est pourvue d'un filetage extérieur (18) dont le diamètre extérieur (d18) est inférieur au diamètre extérieur (d11) du tube polarisé (11).
  11. Ensemble magnétique selon l'une quelconque des revendications 2 à 10, caractérisé en ce que la partie de terminaison est en matière plastique et est injectée au niveau de la partie de fermeture (87).
  12. Ensemble magnétique selon l'une quelconque des revendications 2 à 10, caractérisé en ce que la partie fixe sur place (28a à 28c, 36) du détecteur de course est maintenue contre la partie de terminaison (101) et que la partie de terminaison (101) peut être réglée dans la direction axiale par rapport à la partie de fermeture (100).
  13. Ensemble magnétique selon la revendication 12, caractérisé en ce que la partie de terminaison (101) est reliée à la partie de fermeture (100) par l'intermédiaire d'un entraînement fileté (104, 105).
  14. Ensemble magnétique selon la revendication 13, caractérisé en ce que la partie de fermeture (100) est pourvue d'un filetage intérieur (104) et que la partie de terminaison (101) est pourvue d'un filetage extérieur (105).
  15. Ensemble magnétique selon l'une quelconque des revendications 12 à 14, caractérisé en ce que des moyens de fixation (108) sont prévus qui empêchent une torsion involontaire de la partie de terminaison (101) par rapport à la partie de fermeture (100).
  16. Ensemble magnétique selon la revendication 15, caractérisé en ce que la partie de terminaison (101) est pourvue d'un contre-écrou (108) dont le filetage intérieur (107) prend appui contre le filetage extérieur (105) de la partie de terminaison (101) et dont la surface frontale (110) orientée vers la partie de fermeture (100) s'appuie contre celle-ci.
EP02740320A 2001-05-17 2002-05-08 Ensemble magnetique Expired - Lifetime EP1390959B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10124007 2001-05-17
DE10124007 2001-05-17
PCT/DE2002/001652 WO2002093592A2 (fr) 2001-05-17 2002-05-08 Ensemble magnetique

Publications (2)

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

Family

ID=7685120

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02740320A Expired - Lifetime EP1390959B1 (fr) 2001-05-17 2002-05-08 Ensemble magnetique

Country Status (4)

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

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Publication number Priority date Publication date Assignee Title
US4833352A (en) * 1987-06-20 1989-05-23 Lucas Industries Public Limited Company Linear inductive transducer

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

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