EP0990246B1 - Electromagnet system and method of manufacturing such a system - Google Patents

Electromagnet system and method of manufacturing such a system Download PDF

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Publication number
EP0990246B1
EP0990246B1 EP98934755A EP98934755A EP0990246B1 EP 0990246 B1 EP0990246 B1 EP 0990246B1 EP 98934755 A EP98934755 A EP 98934755A EP 98934755 A EP98934755 A EP 98934755A EP 0990246 B1 EP0990246 B1 EP 0990246B1
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EP
European Patent Office
Prior art keywords
core
thread
yoke
round hole
magnet system
Prior art date
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Expired - Lifetime
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EP98934755A
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German (de)
French (fr)
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EP0990246A2 (en
Inventor
Rudolf Baur
Horst Hendel
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TE Connectivity Solutions GmbH
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Tyco Electronics Logistics AG
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Publication of EP0990246A2 publication Critical patent/EP0990246A2/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H01H2050/367—Methods for joining separate core and L-shaped yoke

Definitions

  • the invention relates to an electromagnetic system with a yoke and a core that has a mounting end in a round hole a yoke section is attached, the core one, preferably cylindrical, and at its fastening end has a conical section, the latter with a diameter exceeding the diameter of the round hole Core diameter penetrates the material of the yoke. Moreover the invention relates to a method for joining core and Yoke with such a system.
  • an electromagnetic system is the beginning known type, in which the core with its cylindrical Shaft from the outside through a round hole of the yoke leg and with its end cone section jammed in a hole in the yoke leg becomes.
  • the core is subjected to impulsive impacts.
  • the core adjustment is only one way there, namely in the direction of the core insert.
  • the aim of the invention is to provide an electromagnetic system to improve the type mentioned so that a good and reliable Connection and magnetic coupling of core and Yoke is easily achieved using this connection exactly - both forward and backward - adjustable is.
  • this goal is achieved in that a thread is formed in the conical section of the core, which is also conical in the threadless wall extended recess of the yoke screwed in a self-deforming manner is.
  • the cone section is therefore of the core and the conical inner wall of the round hole already matched to each other in the yoke section.
  • the final Fastening into each other and fine positioning are done however, by turning over that on the cone section of the core trained thread, which when screwing into the smooth inner surface of the round hole is buried.
  • This one Thread on the core is relatively easy to make, because a vote with a suitably pre-made complementary nut thread in the yoke is not required. Due to the material displacement when screwing in the thread core there are no additional measures in the yoke section both an excellent tight fit and a good one magnetic coupling between the two parts.
  • a special one good coupling results when the thread on the Core is formed as a flat thread, that is, if the individual turns of the thread groove (or the thread grooves at a multiple thread) in relation to the groove depth have a large distance, so that a flattened thread web arises, which is trapezoidal in cross-section or one-sided steeper flank is approximately sawtooth-shaped.
  • the cone section of the core and the conical inner wall of the Round holes in the yoke can, for example, be at an angle the core axis between 0.5 ° and 5 °.
  • an angle similar to tapered sleeves and Taper shanks for self-locking tool attachment is the angle of the cone shell with respect to the axis between 1 ° and 2 °, preferably at approximately 1.5 ° (1 ° 30 ') or between 1 ° 25 'and 1 ° 30' for the so-called Morse cone.
  • this small pitch angle it would also be conceivable to the shaft of the Core with the mounting section slightly conical throughout (with a gradient of about 1 °).
  • the thread on the tapered section can be made if the thread groove (or thread grooves) has a constant inner core diameter has (or have). That means, that the thread at the narrowest point of the cone section is not or little buried while it is widened Cut deeper and deeper at the end.
  • a special one simple manufacture and processing result in the design as a rolling thread.
  • both the yoke and the core are annealed.
  • the soft annealed yoke also has the advantage that it is slightly expanded or deformed when screwing in the thread core, so that no excessively high torques are required are.
  • With the core it is advantageous if it is rolled up of the thread is annealed, since then the thread rolling Throw created on the thread flanks by material displacement undergoes a certain hardening and thus turns when screwed in of the core lighter in the annealed, threadless Digs the material of the round hole.
  • a surface coating made of copper or Copper-graphite facilitate screwing in and prevent seizure. This can be done almost without additional effort, since a coating, for example with Cu, anyway as corrosion protection is desired.
  • the thread runs partly only in the coating, which is a kind of lubrication serves.
  • the double relay shown in Figure 1 has two magnet systems each with a yoke 1 that has a longitudinal section 11 and has a cross section 12.
  • a core 2 with a round cross section is fastened, which will be described in detail later.
  • This core 2 has a pole end 21 with a pole face 22, which forms a working air gap with an anchor 3.
  • the example of a double relay shown in FIG. 1 are two longitudinal yoke legs 11 connected in one piece, and the common anchor 3 acts alternately with the two cores 2 together. This example shows that in such a case the core can only be inserted by can be mounted outside through the yoke leg 12. Otherwise could the invention in the same way for a Single relay with only one yoke and one core applied become.
  • the double relay shown also has a known Way a bobbin 4 as a carrier for two windings 5th as well as contact springs 6 and fixed contacts 7.
  • This relay structure is known for itself and needs in connection with the present Invention not to be discussed further.
  • the coil core 2 is in each case with a fastening end 23 a round hole 13 of the yoke cross leg 12 attached.
  • This Round hole 13 is in adaptation to the core 2 from the inside (from the Coil) flared outwards and with the diameter of the core so that the described below Penetration a good tight fit and a good magnetic Coupling results.
  • the core 2 has a cylindrical one Shank 24, the diameter of which is slightly smaller than that narrowest diameter of the round hole 13 so that it from the outside easily inserted into the coil through the yoke section 12 can be. Furthermore, the core 2 has a conical section 25, which widens conically towards the fastening end 23 is. The slope has an angle ⁇ towards the end the axis of the core, which are approximately between 0.5 ° and 5 ° can. However, as already mentioned, this angle is preferably lie between 1 ° and 2 °.
  • the round hole 13 has in approximately the same slope. But while the Inner surface of the round hole 13 is kept smooth, is on the threaded portion 25 has a rolling thread, the Threaded web 27 has a flattened top.
  • Figure 4 is an enlarged view the detail IV in Figure 3 shows. From this you can see that the depth of the thread groove 26 compared to the thread pitch s (with a single thread) is low, so that the threaded web 27 has a flattened upper side 28, thus a trapezoidal cross section according to FIG has.
  • the inside diameter of the thread is for manufacturing reasons preferably kept the same so that the thread groove 26 at the beginning of the cone section 25 - that is, at its smallest diameter - little or no surface is buried, while this groove always ends 23 gets deeper.
  • a multi-start thread could also be provided.
  • Figure 4 has the thread groove 26 an opening angle ⁇ of approx.
  • the width of the surface 28 of the threaded web 27 (near the end 23), about half the slope s is.
  • other conditions are also possible.
  • a thread cross-section in the form of a flattened sawtooth be provided.
  • Threaded web 27 a flattened top 28, which for example again a width near the end 23 has, which corresponds to about half the thread pitch s.
  • Thread bridge In the area of the smaller cone diameter is the Thread bridge, of course, even wider, since there is the thread groove has a smaller depth d.
  • Hexagonal recess molded into the attack of a Allows turning tool.
  • Hexagons can also be chosen any other shape which enables the attack of a screwing tool.
  • the round hole 13 preferably first preformed by a punching needle and then using a conical pin to form a calibrated conical extension.
  • the yoke becomes after that soft annealed to produce homogeneous magnetic properties and a certain flexibility when screwing in the core pretend.
  • the core is made in the usual way with the cylindrical shaft 24 and the conical shoulder 25 and the hexagonal recess 29 manufactured. It is then also annealed and afterwards passed through a thread rolling device where on the cone section 25 the flat thread already described rolled up becomes. The rolling process creates on the flanks the thread web 27 by material displacement small poses 30. These poses 30 experience a slight hardening and thereby improve penetration when the core is screwed in of the thread in the threadless inner surface of the round hole 13th
  • the core 2 prepared in this way is, as already mentioned, inserted from the outside through the round hole 13 until the cone section 25 clamps with its thread in the round hole 13. After that with a suitable turning tool and using a certain axial force further turned, whereby the thread digs into the material of the yoke.
  • the Core can be turned very precisely in the axial direction - be positioned opposite an anchor, whereby the thread also a certain backward adjustment by turning back allows. In any case, this is a good tightness of the core in the yoke and good magnetic Coupling between the core and the yoke guaranteed.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)

Abstract

The invention relates to an electromagnet system, comprising a yoke (1) and a round core (2) having a cylindrical shaft and an enlarged conical segment (25) extending outwards, towards a fixing end. The shaft of the core is inserted into a round hole (13) of the yoke from the outside. The conical segment (25) of the core also has a thread used to screw the conical section (25) into the threadless round hole (13) of the yoke (1). This enables the core to be positioned accurately and provides a tight fit and a good magnetic coupling.

Description

Die Erfindung betrifft ein Elektromagnetsystem mit einem Joch und einem Kern, der mit einem Befestigungsende in einem Rundloch eines Jochabschnittes befestigt ist, wobei der Kern einen, vorzugsweise zylindrischen, Schaft und an seinem Befestigungsende einen konischen Abschnitt aufweist, welch letzterer mit einem den Durchmesser des Rundloches übersteigenden Kerndurchmesser das Material des Joches durchdringt. Außerdem betrifft die Erfindung ein Verfahren zum Fügen von Kern und Joch bei einem derartigen System.The invention relates to an electromagnetic system with a yoke and a core that has a mounting end in a round hole a yoke section is attached, the core one, preferably cylindrical, and at its fastening end has a conical section, the latter with a diameter exceeding the diameter of the round hole Core diameter penetrates the material of the yoke. Moreover The invention relates to a method for joining core and Yoke with such a system.

Aus der EP 0 593 517 B1 ist ein Elektromagnetsystem der eingangs genannten Art bekannt, bei dem der Kern mit seinem zylindrischen Schaft von der Außenseite her durch ein Rundloch des Jochschenkels gesteckt und mit seinem endseitigen Kegelabschnitt in einer Bohrung des Jochschenkels verklemmt wird. Zum Festklemmen und zur Einstellung der Endposition wird der Kern dabei mit impulsartigen Stößen beaufschlagt. Auf diese Weise ergibt sich zwar ein guter Festsitz des Kerns, doch können die impulsartigen Stöße an anderen mit dem Magnetsystem verbundenen Elementen, beispielsweise an Kontakten, unerwünschte Erschütterungen und Reibungen hervorrufen. Außerdem ist die Justierung des Kerns dort nur in einer Richtung, nämlich in Richtung des Kerneinschubes, möglich.From EP 0 593 517 B1 an electromagnetic system is the beginning known type, in which the core with its cylindrical Shaft from the outside through a round hole of the yoke leg and with its end cone section jammed in a hole in the yoke leg becomes. For clamping and setting the end position the core is subjected to impulsive impacts. In this way, there is a good tight fit of the Kerns, but the impulsive impacts on others with the Elements connected to the magnet system, for example on contacts, cause unwanted shocks and friction. Also, the core adjustment is only one way there, namely in the direction of the core insert.

Aus der DE 31 48 052 A1 ist auch bereits ein elektromagnetisches Relais bekannt, dessen Spulenkern mittels eines Feingewindes in einer entsprechend ebenfalls mit einem Feingewinde versehenen Bohrung durch Einschrauben befestigt und justiert wird. Diese exakte Schraubverbindung erfordert aber nicht nur eine aufwendige Herstellung und Montage der Teile, sondern sie erzeugt allein auch keinen ausreichenden Festsitz, so daß zusätzliche Fixiermittel erforderlich sind. So wird beispielsweise vorgeschlagen, einen Kunststoffkleber auf das Feingewinde aufzutragen oder den Kern zur Sicherung mit einer zusätzlichen Kontermutter zu versehen. Beides erfordert einen zusätzlichen Aufwand, ferner könnte das Fixiermittel im Gewinde die magnetische Kopplung beeinträchtigen, während die zusätzliche Kontermutter auch einen zusätzlichen Platz beansprucht.From DE 31 48 052 A1 there is already an electromagnetic one Relay known, the coil core by means of a fine thread in a correspondingly also with a fine thread provided and fixed by screwing in and adjusted becomes. This exact screw connection not only requires a complex manufacture and assembly of the parts, but it alone does not produce a sufficient tight fit, so that additional fixatives are required. For example suggested putting a plastic glue on that Apply fine thread or the core to secure with a to provide an additional lock nut. Both require one additional effort, the fixative could also be in the thread affect the magnetic coupling while the additional lock nut also takes up an additional space.

Ziel der Erfindung ist es, ein Elektromagnetsystem der eingangs genannten Art so zu verbessern, daß eine gute und zuverlässige Verbindung und magnetische Kopplung von Kern und Joch auf einfache Weise erreicht wird, wobei diese Verbindung genau - und zwar sowohl vorwärts als auch rückwärts - einstellbar ist.The aim of the invention is to provide an electromagnetic system to improve the type mentioned so that a good and reliable Connection and magnetic coupling of core and Yoke is easily achieved using this connection exactly - both forward and backward - adjustable is.

Erfindungsgemäß wird dieses Ziel dadurch erreicht, daß auf dem Kegelabschnitt des Kerns ein Gewinde ausgebildet ist, welches in die an sich gewindelose Wand der ebenfalls konisch erweiterten Ausnehmung des Joches selbst-verformend eingedreht ist.According to the invention this goal is achieved in that a thread is formed in the conical section of the core, which is also conical in the threadless wall extended recess of the yoke screwed in a self-deforming manner is.

Bei dem erfindungsgemäßen Magnetsystem sind also der Kegelabschnitt des Kerns und die konische Innenwand des Rundloches im Jochabschnitt bereits aneinander angepaßt. Die endgültige Befestigung ineinander und die Feinpositionierung erfolgen jedoch durch Drehen über das auf dem Kegelabschnitt des Kerns ausgebildete Gewinde, welches sich beim Eindrehen in die glatte Innenoberfläche des Rundloches eingräbt. Dieses eine Gewinde auf dem Kern ist verhältnismäßig einfach herzustellen, da eine Abstimmung mit einem entsprechend vorgefertigten komplementären Muttergewinde im Joch nicht erforderlich ist. Durch die Materialverdrängung beim Einschrauben des Gewindekerns in den Jochabschnitt ergibt sich auch ohne Zusatzmaßnahmen sowohl ein hervorragender Festsitz als auch eine gute magnetische Kopplung zwischen den beiden Teilen. Eine besonders gute Kopplung ergibt sich dann, wenn das Gewinde auf dem Kern als Flachgewinde ausgebildet ist, das heißt, wenn die einzelnen Windungen der Gewindenut (bzw. der Gewindenuten bei einem mehrgängigen Gewinde) im Verhältnis zur Nuttiefe einen großen Abstand aufweisen, so daß ein abgeflachter Gewindesteg entsteht, der im Querschnitt trapezförmig oder auch bei einseitig steilerer Flanke annähernd sägezahnförmig ist.In the magnet system according to the invention, the cone section is therefore of the core and the conical inner wall of the round hole already matched to each other in the yoke section. The final Fastening into each other and fine positioning are done however, by turning over that on the cone section of the core trained thread, which when screwing into the smooth inner surface of the round hole is buried. This one Thread on the core is relatively easy to make, because a vote with a suitably pre-made complementary nut thread in the yoke is not required. Due to the material displacement when screwing in the thread core there are no additional measures in the yoke section both an excellent tight fit and a good one magnetic coupling between the two parts. A special one good coupling results when the thread on the Core is formed as a flat thread, that is, if the individual turns of the thread groove (or the thread grooves at a multiple thread) in relation to the groove depth have a large distance, so that a flattened thread web arises, which is trapezoidal in cross-section or one-sided steeper flank is approximately sawtooth-shaped.

Der Kegelabschnitt des Kerns und die konische Innenwand des Rundlochs im Joch können beispielsweise einen Winkel gegenüber der Kernachse zwischen 0,5° und 5° haben. Vorzugsweise wählt man aber einen Winkel ähnlich wie bei Kegelhülsen und Kegelschäften für selbsthemmende Werkzeugbefestigung. Hierbei liegt der Winkel des Kegelmantels gegenüber der Achse zwischen 1° und 2°, vorzugsweise bei annähernd 1,5° (1°30') bzw. zwischen 1°25' und 1°30' beim sog. Morse-Kegel. Bei diesem geringen Steigungswinkel wäre es auch denkbar, den Schaft des Kerns mit dem Befestigungsabschnitt durchgehend leicht konisch (mit etwa 1° Steigung) auszubilden. Besonders einfach läßt sich das Gewinde auf dem Kegelabschnitt herstellen, wenn die Gewindenut (bzw. Gewindenuten) einen gleichbleibenden Innen-Kerndurchmesser aufweist (bzw. aufweisen). Das bedeutet, daß das Gewinde an der engsten Stelle des Kegelabschnittes nicht oder nur wenig eingegraben ist, während es zum verbreiterten Ende hin immer tiefer eingeschnitten ist. Eine besonders einfache Herstellung und Verarbeitung ergibt sich bei der Ausgestaltung als Rollgewinde.The cone section of the core and the conical inner wall of the Round holes in the yoke can, for example, be at an angle the core axis between 0.5 ° and 5 °. Preferably but you choose an angle similar to tapered sleeves and Taper shanks for self-locking tool attachment. in this connection is the angle of the cone shell with respect to the axis between 1 ° and 2 °, preferably at approximately 1.5 ° (1 ° 30 ') or between 1 ° 25 'and 1 ° 30' for the so-called Morse cone. With this small pitch angle, it would also be conceivable to the shaft of the Core with the mounting section slightly conical throughout (with a gradient of about 1 °). Particularly easy the thread on the tapered section can be made if the thread groove (or thread grooves) has a constant inner core diameter has (or have). That means, that the thread at the narrowest point of the cone section is not or little buried while it is widened Cut deeper and deeper at the end. A special one simple manufacture and processing result in the design as a rolling thread.

Zur Verbesserung der magnetischen Eigenschaften werden zweckmäßigerweise sowohl das Joch als auch der Kern weichgeglüht. Das weich geglühte Joch hat zudem den Vorteil, daß es sich beim Eindrehen des Gewindekerns leicht aufweitet bzw. verformt, so daß keine allzu hohen Drehmomente erforderlich sind. Beim Kern ist es von Vorteil, wenn er vor dem Aufrollen des Gewindes geglüht wird, da dann der beim Gewinderollen durch Materialverdrängung erzeugte Aufwurf an den Gewindeflanken eine gewisse Härtung erfährt und sich so beim Eindrehen des Kerns leichter in das weichgeglühte, gewindelose Material des Rundloches eingräbt. To improve the magnetic properties are expedient both the yoke and the core are annealed. The soft annealed yoke also has the advantage that it is slightly expanded or deformed when screwing in the thread core, so that no excessively high torques are required are. With the core, it is advantageous if it is rolled up of the thread is annealed, since then the thread rolling Throw created on the thread flanks by material displacement undergoes a certain hardening and thus turns when screwed in of the core lighter in the annealed, threadless Digs the material of the round hole.

Außerdem kann eine Oberflächenbeschichtung aus Kupfer oder Kupfer-Graphit das Eindrehen erleichtern und ein Fressen verhindern. Dies kann fast ohne zusätzlichen Aufwand erfolgen, da eine Beschichtung, beispielsweise mit Cu, ohnehin als Korrosionsschutz erwünscht ist. Das Gewinde verläuft zum Teil lediglich in der Beschichtung, die als eine Art Schmierung dient.In addition, a surface coating made of copper or Copper-graphite facilitate screwing in and prevent seizure. This can be done almost without additional effort, since a coating, for example with Cu, anyway as corrosion protection is desired. The thread runs partly only in the coating, which is a kind of lubrication serves.

Ein erfindungsgemäßes Verfahren zum Herstellen eines erfindungsgemäßen Elektromagnetsystems weist im wesentlichen die folgenden Schritte auf:

  • Erzeugung eines konischen Rundloches in dem Jochabschnitt;
  • Erzeugung eines Kerns mit einem zylindrischen Schaft und einem zum freien Ende hin erweiterten Kegelabschnitt an einem Ende des Kerns;
  • Erzeugung eines Gewindes auf dem Kegelabschnitt;
  • Durchstecken des zylindrischen Schaftes des Kerns durch das Rundloch des Jochabschnittes, bis der Kegelabschnitt in dem Rundloch klemmt und
  • Drehen des Kerns in Gewinderichtung unter Anwendung einer Axialkraft, bis das freie Ende des zylindrischen Schaftes eine vorgegebene Position erreicht hat.
Besondere Ausgestaltungen der einzelnen Verfahrensschritte sind in den Unteransprüchen angegeben.A method according to the invention for producing an electromagnet system according to the invention essentially has the following steps:
  • Creating a conical round hole in the yoke section;
  • Creating a core with a cylindrical shaft and a tapered portion flared at one end of the core;
  • Creating a thread on the tapered portion;
  • Push the cylindrical shaft of the core through the round hole of the yoke section until the cone section clamps in the round hole and
  • Turning the core in the thread direction using an axial force until the free end of the cylindrical shaft has reached a predetermined position.
Special configurations of the individual process steps are specified in the subclaims.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel anhand der Zeichnungen näher erläutert. Es zeigt

  • Figur 1 ein Doppelrelais mit zwei gekoppelten, erfindungsgemäßen Magnetsystemen,
  • Figur 2 und 3 einen teilweise aufgeschnittenen Kern eines Magnetsystems gemäß Figur 1 in perspektivischer Darstellung und in Seitenansicht,
  • Figur 4 einen vergrößerten Detailausschnitt IV aus Figur 3 und
  • Figur 5 den gleichen Ausschnitt wie Figur 4, jedoch mit einer abgewandelten Gewindeform.
    • The invention is explained in more detail using an exemplary embodiment with reference to the drawings. It shows
  • FIG. 1 shows a double relay with two coupled magnet systems according to the invention,
  • 2 and 3 show a partially cut core of a magnet system according to FIG. 1 in a perspective view and in a side view,
  • Figure 4 is an enlarged detail IV of Figure 3 and
  • Figure 5 shows the same section as Figure 4, but with a modified thread shape.

    • Das in Figur 1 gezeigte Doppelrelais besitzt zwei Magnetsysteme mit jeweils einem Joch 1, das einen Längsabschnitt 11 und einen Querabschnitt 12 besitzt. In jedem der Joch-Querabschnitte 12 ist ein Kern 2 mit rundem Querschnitt befestigt, der später noch im einzelnen beschrieben wird. Jeder dieser Kerne 2 besitzt ein Polende 21 mit einer Polfläche 22, die mit einem Anker 3 einen Arbeitsluftspalt bildet. In dem in Figur 1 dargestellten Beispiel eines Doppelrelais sind die beiden Joch-Längsschenkel 11 einstückig miteinander verbunden, und der gemeinsame Anker 3 wirkt abwechselnd mit den beiden Kernen 2 zusammen. Aus diesem Beispiel ergibt sich, daß in einem solchen Fall der Kern nur durch Einstecken von außen durch den Jochschenkel 12 montiert werden kann. Ansonsten könnte die Erfindung aber in gleicher Weise auch für ein Einfachrelais mit nur einem Joch und einem Kern angewendet werden.The double relay shown in Figure 1 has two magnet systems each with a yoke 1 that has a longitudinal section 11 and has a cross section 12. In each of the yoke cross sections 12 a core 2 with a round cross section is fastened, which will be described in detail later. Everyone this core 2 has a pole end 21 with a pole face 22, which forms a working air gap with an anchor 3. By doing The example of a double relay shown in FIG. 1 are two longitudinal yoke legs 11 connected in one piece, and the common anchor 3 acts alternately with the two cores 2 together. This example shows that in such a case the core can only be inserted by can be mounted outside through the yoke leg 12. Otherwise could the invention in the same way for a Single relay with only one yoke and one core applied become.

    Das dargestellte Doppelrelais besitzt weiterhin in bekannter Weise einen Spulenkörper 4 als Träger für zwei Wicklungen 5 sowie Kontaktfedern 6 und Festkontakte 7. Dieser Relaisaufbau ist für sich bekannt und braucht im Zusammenhang mit der vorliegenden Erfindung nicht weiter erörtert zu werden.The double relay shown also has a known Way a bobbin 4 as a carrier for two windings 5th as well as contact springs 6 and fixed contacts 7. This relay structure is known for itself and needs in connection with the present Invention not to be discussed further.

    Der Spulenkern 2 ist jeweils mit einem Befestigungsende 23 in einem Rundloch 13 des Joch-Querschenkels 12 befestigt. Dieses Rundloch 13 ist in Anpassung an den Kern 2 von innen (von der Spule) nach außen konisch erweitert und mit dem Durchmesser des Kerns so abgestimmt, daß die nachfolgend beschriebene Durchdringung einen guten Festsitz und eine gute magnetische Kopplung ergibt.The coil core 2 is in each case with a fastening end 23 a round hole 13 of the yoke cross leg 12 attached. This Round hole 13 is in adaptation to the core 2 from the inside (from the Coil) flared outwards and with the diameter of the core so that the described below Penetration a good tight fit and a good magnetic Coupling results.

    Der Kern 2 besitzt gemäß den Figuren 2 und 3 einen zylindrischen Schaft 24, dessen Durchmesser etwas kleiner ist als der engste Durchmesser des Rundloches 13, so daß er von außen leicht durch den Jochabschnitt 12 in die Spule eingesteckt werden kann. Weiterhin besitzt der Kern 2 einen Kegelabschnitt 25, der zum Befestigungsende 23 hin konisch erweitert ist. Die Steigung weist zum Ende hin einen Winkel α gegenüber der Achse des Kerns auf, der etwa zwischen 0,5° und 5° liegen kann. Vorzugsweise wird aber dieser Winkel, wie bereits erwähnt, zwischen 1° und 2° liegen. Das Rundloch 13 weist im übrigen annähernd die gleiche Steigung auf. Während aber die Innenoberfläche des Rundloches 13 glatt gehalten ist, ist auf dem Gewindeabschnitt 25 ein Rollgewinde ausgebildet, dessen Gewindesteg 27 eine abgeflachte Oberseite aufweist. Deutlich ist dies in Figur 4 zu sehen, die eine vergrößerte Darstellung der Einzelheit IV in Figur 3 zeigt. Hieraus ist zu sehen, daß die Tiefe der Gewindenut 26 im Vergleich zur Gewindesteigung s (bei einem eingängigen Gewinde) gering ist, so daß der Gewindesteg 27 eine abgeflachte Oberseite 28 aufweist, also gemäß Figur 4 einen trapezförmigen Querschnitt besitzt. Der Innendurchmesser des Gewindes wird aus Fertigungsgründen vorzugsweise gleich gehalten, so daß die Gewindenut 26 zu Beginn des Kegelabschnittes 25 - also bei dessen kleinstem Durchmesser - nicht oder nur wenig in die Oberfläche eingegraben ist, während diese Nut zum Ende 23 hin immer tiefer wird. Anstelle des dargestellten eingängigen Gewindes könnte auch ein mehrgängiges Gewinde vorgesehen werden. Gemäß Figur 4 besitzt die Gewindenut 26 einen Öffnungswinkel γ von ca. 60°, wobei die Breite der Oberfläche 28 des Gewindesteges 27 (in der Nähe des endes 23), etwa die Hälfte der Steigung s beträgt. Es sind aber auch andere Verhältnisse möglich. Beispielsweise kann, wie in einer Abwandlung gemäß Figur 5 gezeigt, ein Gewindequerschnitt in Form eines abgeflachten Sägezahns vorgesehen werden. Auch in diesem Fall besitzt der Gewindesteg 27 eine abgeflachte Oberseite 28, welche beispielsweise in der Nähe des Endes 23 wiederum eine Breite aufweist, die etwa der Hälfte der Gewindesteigung s entspricht. Im Bereich des kleineren Kegeldurchmessers ist der Gewindesteg natürlich noch breiter, da dort die Gewindenut eine geringere Tiefe d aufweist. Zum Eindrehen des Kerns 2 in das Rundloch 13 ist vom Befestigungsende 23 her zentrisch eine Sechskant-Ausnehmung eingeformt, die den Angriff eines Drehwerkzeugs ermöglicht. Natürlich könnte anstelle des Sechskants auch eine beliebige andere Form gewählt werden, die den Angriff eines Schraubwerkzeuges ermöglicht.According to FIGS. 2 and 3, the core 2 has a cylindrical one Shank 24, the diameter of which is slightly smaller than that narrowest diameter of the round hole 13 so that it from the outside easily inserted into the coil through the yoke section 12 can be. Furthermore, the core 2 has a conical section 25, which widens conically towards the fastening end 23 is. The slope has an angle α towards the end the axis of the core, which are approximately between 0.5 ° and 5 ° can. However, as already mentioned, this angle is preferably lie between 1 ° and 2 °. The round hole 13 has in approximately the same slope. But while the Inner surface of the round hole 13 is kept smooth, is on the threaded portion 25 has a rolling thread, the Threaded web 27 has a flattened top. Clear this can be seen in Figure 4, which is an enlarged view the detail IV in Figure 3 shows. From this you can see that the depth of the thread groove 26 compared to the thread pitch s (with a single thread) is low, so that the threaded web 27 has a flattened upper side 28, thus a trapezoidal cross section according to FIG has. The inside diameter of the thread is for manufacturing reasons preferably kept the same so that the thread groove 26 at the beginning of the cone section 25 - that is, at its smallest diameter - little or no surface is buried, while this groove always ends 23 gets deeper. Instead of the single thread shown a multi-start thread could also be provided. According to Figure 4 has the thread groove 26 an opening angle γ of approx. 60 °, the width of the surface 28 of the threaded web 27 (near the end 23), about half the slope s is. However, other conditions are also possible. For example can, as shown in a modification according to FIG. 5, a thread cross-section in the form of a flattened sawtooth be provided. In this case too Threaded web 27 a flattened top 28, which for example again a width near the end 23 has, which corresponds to about half the thread pitch s. In the area of the smaller cone diameter is the Thread bridge, of course, even wider, since there is the thread groove has a smaller depth d. To screw in the core 2 in the circular hole 13 is centrically one from the fastening end 23 Hexagonal recess molded into the attack of a Allows turning tool. Of course, instead of Hexagons can also be chosen any other shape which enables the attack of a screwing tool.

    Bei der Herstellung des Magnetsystems wird das Rundloch 13 vorzugsweise zunächst durch eine Stanznadel vorgeformt und anschließend mittels eines konischen Stiftes zur Bildung einer konischen Erweiterung kalibriert. Das Joch wird danach weichgeglüht, um homogene magnetische Eigenschaften zu erzeugen und eine gewisse Nachgiebigkeit beim Eindrehen des Kerns vorzugeben.When manufacturing the magnet system, the round hole 13 preferably first preformed by a punching needle and then using a conical pin to form a calibrated conical extension. The yoke becomes after that soft annealed to produce homogeneous magnetic properties and a certain flexibility when screwing in the core pretend.

    Der Kern wird in üblicher Weise mit dem zylindrischen Schaft 24 und dem Kegelansatz 25 sowie der Sechskant-Ausnehmung 29 hergestellt. Er wird dann ebenfalls weichgeglüht und danach durch eine Gewinderollvorrichtung geführt, wo auf dem Kegelabschnitt 25 das bereits beschriebene Flachgewinde aufgerollt wird. Durch den Rollvorgang entstehen an den Flanken des Gewindesteges 27 durch Materialverdrängung kleine Aufwürfe 30. Diese Aufwürfe 30 erfahren eine leichte Härtung und verbessern dadurch beim Eindrehen des Kerns das Eindringen des Gewindes in die gewindelose Innenoberfläche des Rundloches 13.The core is made in the usual way with the cylindrical shaft 24 and the conical shoulder 25 and the hexagonal recess 29 manufactured. It is then also annealed and afterwards passed through a thread rolling device where on the cone section 25 the flat thread already described rolled up becomes. The rolling process creates on the flanks the thread web 27 by material displacement small poses 30. These poses 30 experience a slight hardening and thereby improve penetration when the core is screwed in of the thread in the threadless inner surface of the round hole 13th

    Der so vorbereitete Kern 2 wird also, wie bereits erwähnt, von außen durch das Rundloch 13 gesteckt, bis der Kegelabschnitt 25 mit seinem Gewinde in dem Rundloch 13 klemmt. Danach wird er mit einem geeigneten Drehwerkzeug und unter Anwendung einer gewissen Axialkraft weiter eingedreht, wobei sich das Gewinde in das Material des Joches eingräbt. Der Kern kann durch Drehen auf diese Weise sehr genau in Axialrichtung - gegenüber einem Anker - positioniert werden, wobei das Gewinde auch eine gewisse Rückwärts-Justierung durch Zurückdrehen ermöglicht. In jedem Fall ist auf diese Weise ein guter Festsitz des Kerns im Joch und eine gute magnetische Kopplung zwischen dem Kern und dem Joch gewährleistet.The core 2 prepared in this way is, as already mentioned, inserted from the outside through the round hole 13 until the cone section 25 clamps with its thread in the round hole 13. After that with a suitable turning tool and using a certain axial force further turned, whereby the thread digs into the material of the yoke. The Core can be turned very precisely in the axial direction - be positioned opposite an anchor, whereby the thread also a certain backward adjustment by turning back allows. In any case, this is a good tightness of the core in the yoke and good magnetic Coupling between the core and the yoke guaranteed.

    Claims (15)

    1. An electromagnet system having a yoke (1) and a core (2) which is secured by a securing end (23) in a round hole (13) in a yoke portion (12), the core (2) having a preferably cylindrical shaft (24) and a conical portion (25) which widens towards its securing end (23) and penetrates the material of the yoke by a core diameter exceeding the diameter of the round hole (13),
         characterised in that there is made on the conical portion (25) a thread (26, 27) which is screwed into the per se non-threaded wall of the also conically widened recess (13) in the yoke (1) in a self-deforming manner.
    2. A magnet system according to Claim 1, characterised in that the thread on the conical portion (25) of the core (2) has a flattened thread web (27, 28).
    3. A magnet system according to Claim 2, characterised in that the thread web has an approximately trapezoidal cross-section (Figure 4).
    4. A magnet system according to Claim 2, characterised in that the thread web (27) has an approximately sawtooth-shaped cross-section (Figure 5).
    5. A magnet system according to one of Claims 1 to 4, characterised in that the conical portion (25) of the core (2) has a lead angle (α) of its outer surface of between 0.5° and 5° with respect to its axis.
    6. A magnet system according to Claim 5, characterised in that the lead angle (α) is between 1° and 2°, preferably approximately 1.5°.
    7. A magnet system according to one of Claims 1 to 6, characterised in that the thread (26, 27) on the conical portion (25) of the core (2) is provided with a constant diameter of the thread groove (26).
    8. A magnet system according to one of Claims 1 to 7, characterised in that the thread on the conical portion (25) of the core (2) is a rolled thread.
    9. A magnet system according to one of Claims 1 to 8, characterised in that the yoke (1) and the core (2) are soft-annealed.
    10. A magnet system according to one of Claims 1 to 9, characterised in that the end face (23) of the conical portion (25) has an axial prismatic recess, in particular a hexagon socket (29), for receiving a rotary tool.
    11. A method of manufacturing an electromagnet system according to one of Claims 1 to 10,
         characterised by the following steps:
      producing a conical round hole (13) in a yoke portion (12);
      manufacturing a core (2) having a cylindrical shaft (24) and a conical portion (25) which is widened towards the free end;
      producing a thread (26, 27) on the conical portion (25);
      pushing the cylindrical shaft (24) of the core (2) through the round hole (13) in the yoke portion (12) until the conical portion is clamped in the round hole; and
      rotating the core (2) in the direction of the thread, applying an axial force, until the free end of the cylindrical shaft (24) has reached a predetermined position.
    12. A method according to Claim 11, characterised in that the round hole (13) is punched, and is sized using a conical pin.
    13. A method according to Claim 11 or 12, characterised in that the thread (26, 27) is produced by the rolling method.
    14. A method according to one of Claims 11 to 13, characterised in that the yoke (1) is soft-annealed after the conical round hole (13) has been produced.
    15. A method according to Claim 13 or 14, characterised in that the core (2) is soft-annealed before the thread is rolled.
    EP98934755A 1997-06-19 1998-05-20 Electromagnet system and method of manufacturing such a system Expired - Lifetime EP0990246B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19726055A DE19726055C1 (en) 1997-06-19 1997-06-19 Electromagnet system with method of jointing core and yoke
    DE19726055 1997-06-19
    PCT/DE1998/001386 WO1998059351A2 (en) 1997-06-19 1998-05-20 Electromagnet system and method for assembling a core and a yoke in such a system

    Publications (2)

    Publication Number Publication Date
    EP0990246A2 EP0990246A2 (en) 2000-04-05
    EP0990246B1 true EP0990246B1 (en) 2002-08-28

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98934755A Expired - Lifetime EP0990246B1 (en) 1997-06-19 1998-05-20 Electromagnet system and method of manufacturing such a system

    Country Status (8)

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    US (1) US6300851B1 (en)
    EP (1) EP0990246B1 (en)
    JP (1) JP3923092B2 (en)
    KR (1) KR100515433B1 (en)
    CA (1) CA2294156C (en)
    DE (2) DE19726055C1 (en)
    TW (1) TW382715B (en)
    WO (1) WO1998059351A2 (en)

    Families Citing this family (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JP3590738B2 (en) * 1999-04-27 2004-11-17 Ｎｅｃトーキン株式会社 Electromagnetic relay, adjustment method and assembly method thereof
    US7548146B2 (en) * 2006-12-27 2009-06-16 Tyco Electronics Corporation Power relay
    JP4803206B2 (en) * 2008-04-24 2011-10-26 パナソニック電工株式会社 Electromagnet for relay
    EP3025846B1 (en) * 2014-11-28 2019-11-13 Crompton Technology Group Limited Composite tension/compression strut

    Family Cites Families (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3209294A (en) * 1962-10-23 1965-09-28 Westinghouse Electric Corp Magnetic core structures
    DE3148052A1 (en) * 1981-12-04 1983-06-09 Robert Bosch Gmbh, 7000 Stuttgart Electromagnetic relay and method for its production
    US4720909A (en) * 1983-10-31 1988-01-26 Amf Inc. Method of manufacturing miniature power switching relays
    EP0528833B1 (en) * 1990-05-14 1994-08-03 Siemens Aktiengesellschaft Electromagnetic switching system and process for producing the same
    DE4122705C1 (en) * 1991-07-09 1992-07-30 Siemens Ag, 8000 Muenchen, De
    US5311162A (en) * 1993-05-14 1994-05-10 Evolutionary Concepts, Inc. Solenoid device
    JPH0917312A (en) * 1995-06-27 1997-01-17 Matsushita Electric Works Ltd Polar relay

    Also Published As

    Publication number Publication date
    CA2294156C (en) 2006-12-05
    KR20010013931A (en) 2001-02-26
    WO1998059351A2 (en) 1998-12-30
    US6300851B1 (en) 2001-10-09
    DE59805327D1 (en) 2002-10-02
    JP3923092B2 (en) 2007-05-30
    TW382715B (en) 2000-02-21
    CA2294156A1 (en) 1998-12-30
    DE19726055C1 (en) 1998-11-12
    WO1998059351A3 (en) 1999-03-18
    KR100515433B1 (en) 2005-09-20
    EP0990246A2 (en) 2000-04-05
    JP2002508881A (en) 2002-03-19

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