EP0697706A2 - Armature holding structure for an electromagnetic relay - Google Patents

Armature holding structure for an electromagnetic relay Download PDF

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Publication number
EP0697706A2
EP0697706A2 EP95110514A EP95110514A EP0697706A2 EP 0697706 A2 EP0697706 A2 EP 0697706A2 EP 95110514 A EP95110514 A EP 95110514A EP 95110514 A EP95110514 A EP 95110514A EP 0697706 A2 EP0697706 A2 EP 0697706A2
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EP
European Patent Office
Prior art keywords
spring
section
anchor
armature
bearing
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.)
Granted
Application number
EP95110514A
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German (de)
French (fr)
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EP0697706A3 (en
EP0697706B1 (en
Inventor
Horst Hendel
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Siemens AG
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Siemens AG
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Publication of EP0697706A2 publication Critical patent/EP0697706A2/en
Publication of EP0697706A3 publication Critical patent/EP0697706A3/en
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Publication of EP0697706B1 publication Critical patent/EP0697706B1/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
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/24—Parts rotatable or rockable outside coil
    • H01H50/28—Parts movable due to bending of a blade spring or reed

Definitions

  • the invention relates to an armature holder for an electromagnetic relay with a flat yoke leg arranged parallel to a coil core, which forms on its end face a bearing edge for a plate-shaped armature and at least one retaining pin projecting over the end face, the armature being arranged approximately at right angles to the yoke leg and with the coil core forms a working air gap, further with an armature spring made of sheet metal, which is fastened flat with a bearing section on the armature side facing away from the coil core and is held on the retaining pin with a biasing section.
  • An anchor bracket of this type is already known for a relay, which is described in DE 35 28 715 A1.
  • the armature rests on the end face of the yoke leg, it having a recess in the area of a respective holding pin.
  • the armature spring is bent outwards in the bearing area away from the yoke leg and fastened with its retaining tabs on the smooth surface of the retaining pin or pins, which must be done, for example, due to the effective forces by a welding process or in a similar manner. Since the bearing point of the armature does not coincide with the axis of movement of the spring, a certain bearing friction in the armature bearing can be expected, which is undesirable.
  • the aim of the present invention is to provide an anchor bracket of the type mentioned, in which a very low-friction and abrasion-resistant anchor bearing is created by a specific anchor-yoke-spring combination.
  • the anchor together with the spring should be easy to assemble with few parts, especially with a few simple operations; at the same time, clamping effects between anchor, yoke and spring should be avoided.
  • this goal is achieved with an anchor bracket of the type mentioned in that the bearing edge is formed between the end face and the broad side of the yoke leg facing the core, that the anchor is supported with its end face on the broad side of the yoke leg, that the anchor spring with its Bearing section rests on the end face of the yoke leg and that the biasing portion of the armature spring is supported on the holding pin with such a preload that the bearing inner edge formed between the bearing section of the spring and the armature end face is pressed against the bearing edge of the yoke leg.
  • the anchor does not rest on the end face of the yoke leg as in most conventional cases, rather it is supported with its end face on the broad side of the yoke, the end face of the anchor forming an inner bearing edge together with the anchor spring, which includes the bearing edge formed by the end of the yoke leg.
  • the bearing axis of the armature and that of the spring coincide with it so that the friction in the bearing is minimized. Due to the direction of the forces with which the armature is pressed into the bearing, it is also sufficient to simply hang the prestressing section of the armature spring from the yoke outside facing away from the armature into a notch or the like of the holding pin. This also results in simple assembly, since a welding process or the like is not required. (The anchor is connected to the anchor spring by welding or riveting before it is mounted on the yoke.)
  • the anchor With the type of anchor bearing provided here on the broad side of the yoke leg, the anchor can remain connected to the yoke leg without cuts over the entire yoke width, which has a good effect on the magnetic transition, because neither the anchor spring nor the retaining pin cut through the bearing edge.
  • the bearing edge should have a smaller cross-section than the inner edge formed between the armature end face and the bearing section of the spring, with the choice of the attachment point of the prestressing section of the spring on the Retaining pin the restoring force for the anchor is specified.
  • the hook-in point and thus the restoring force can be adjusted by deforming the retaining pin, that is, by bending it about an axis parallel to the bearing edge.
  • the preload section expediently interlocks with the retaining pin in such a way that it and the anchor are secured against displacement in the direction parallel to the bearing axis.
  • the bearing edge is divided into two separate edge sections by the projecting retaining pin or by additional yoke stages, the bearing section of the armature spring corresponding to the edge sections forming two spring bars between which the prestressing section is cut free.
  • a reverse embodiment would also be conceivable, in which a central edge section with a bearing section of the armature spring would be provided between two lateral holding pins and two spring prestressing sections, but in this case the stability of the armature guide would be lower due to the narrower support base of the armature spring on the yoke leg.
  • the anchor spring is also designed so that the biasing portion and the bearing portion or the spring bars are adjacent to each other on a common spring end portion and get their mutual bias by opposite elastic expansion out of the plane of the spring end portion.
  • This common spring end section expediently extends parallel to the outer broad side of the yoke leg, while the bearing section and the biasing section of the armature spring are offset in an L-shaped manner toward the anchor or toward the holding pin.
  • the common spring section expediently extends parallel to the yoke leg at a certain distance, as a result of which it can be deflected during the armature movement and results in a softer spring characteristic.
  • the biasing portion is formed by a central recess to form a spring clip with a relatively small cross section, which is supported in a notch of the retaining pin.
  • the transverse web of the spring clip, which is suspended on the retaining pin, is shaped in the shape of an arc inwards, as a result of which the abovementioned securing against displacement in the direction of the armature bearing axis results.
  • the relay shown in the drawing has a core 1 in a base body or coil body, not shown, which is connected to an L-shaped yoke 2, a free yoke leg 21 extending parallel to the core.
  • An armature 3 is mounted on the yoke leg 21 and forms a working air gap with a core pole plate 4. It is held by an anchor spring 10 in a manner to be described later;
  • a second contact spring 11a indicated by dashed lines in FIG. 4, can be used, for example, to make bridges or double contacts.
  • the power supply to the contact spring takes place via a strand 8 and a connection element, not shown.
  • the end face of the armature 3 is coupled to the broad surface of the yoke leg 21 facing the core.
  • the yoke leg forms a bearing edge 22 on its end face, which is, however, formed in the form of two edge sections only on the outer regions of the yoke leg 21.
  • the armature spring 10, which is cut out in the form of a frame in the bearing area, has a bearing section in the form of two spring bars 12 which are fastened to rest on the outside of the armature 3 facing away from the core, for example by rivets 31.
  • the spring bars 12 form an inner edge 32 with the end face of the armature 3, which rests on the bearing edge 22.
  • the end face 23 of the yoke leg 21 is slightly chamfered, so that the bearing edge 22 has an angle of slightly less than 90 ° in cross section in order to ensure the free movement of the armature 3 with the spring bars 12 on the bearing edge 22.
  • the armature spring 10 is preferably made of a harder material than the soft iron of the yoke 2, for example of stainless steel. In this way, the material pairing of the yoke on the one hand and the armature spring on the other hand results in a good bearing property.
  • the yoke leg 21 is slightly extended and thus forms yoke steps 24, which secure the armature against lateral impact and additionally improve the magnetic coupling of the armature 3 to the yoke leg 21.
  • the width of the yoke steps 24 is selected such that a distance to the spring bars 12 remains in each case in order to avoid a frictional movement between the spring bars and the yoke step.
  • the yoke leg 21 has, in the extension of its end face and in the middle between the two yoke stages 24, a projecting retaining pin 25 which has a notch 26 for hanging in a prestressing section 13 of the armature spring.
  • This biasing section 13 is formed by a central recess 17 to form a spring clip with a relatively narrow web width and thus a small cross section, so that it has a soft spring characteristic.
  • the transverse web 14 of the spring clip located in the hooking notch 26 of the retaining pin is also drawn inward in an arc shape, as a result of which the spring clip and with it the anchor are centered.
  • a mounting bracket 15 is also formed, with the help of which the spring clip can be gripped and hung during assembly.
  • the armature-armature-spring combination with the forces F1 and F2 is pressed against the bearing edge 22 in two directions.
  • the position of the attachment point in the notch 26 generates a prestressing moment for the armature with respect to its pivot point on the inner edge 32, as a result of which the rest contact force is determined.
  • the retaining pin 25 is weakened in cross section by an adjusting notch 27 so that it can be deformed along the double arrow 28 in order to set the hooking point in the notch 26 and thus the pretension.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Impact Printers (AREA)

Abstract

The fixing has at least one fixing pin (25) provided by an extension of the flat yoke arm (21) extending parallel to the coil core (1), which provides a bearing edge (22) for the armature plate (3), lying at right angles to the yoke arm. A bearing section (12) of the armature spring (10) lies against the end face (32) of the yoke arm, with a tensioning section (13) projecting beyond the yoke arm end face held by the fixing pin, to provide a spring bias holding the armature plate against the bearing edge of the yoke arm. The fixing point of the bias section of the spring relative to the fixing pin determines the resetting force for the armature plate.

Description

Die Erfindung betrifft eine Ankerhalterung für ein elektromagnetisches Relais mit einem parallel zu einem Spulenkern angeordneten flachen Jochschenkel, der an seiner Stirnseite eine Lagerkante für einen plattenförmigen Anker sowie mindestens einen über die Stirnseite vorspringenden Haltezapfen bildet, wobei der Anker annähernd rechtwinkelig zum Jochschenkel angeordnet ist und mit dem Spulenkern einen Arbeitsluftspalt bildet, ferner mit einer aus Blech geformten Ankerfeder, welche mit einem Lagerabschnitt auf der dem Spulenkern abgewandten Ankerseite flach aufliegend befestigt ist und mit einem Vorspannabschnitt an dem Haltezapfen gehalten ist.The invention relates to an armature holder for an electromagnetic relay with a flat yoke leg arranged parallel to a coil core, which forms on its end face a bearing edge for a plate-shaped armature and at least one retaining pin projecting over the end face, the armature being arranged approximately at right angles to the yoke leg and with the coil core forms a working air gap, further with an armature spring made of sheet metal, which is fastened flat with a bearing section on the armature side facing away from the coil core and is held on the retaining pin with a biasing section.

Eine Ankerhalterung dieser Art ist bereits bei einem Relais bekannt, welches in der DE 35 28 715 A1 beschrieben ist. Dort liegt der Anker auf der Stirnseite des Jochschenkels auf, wobei er im Bereich eines jeweiligen Haltezapfens eine Ausnehmung besitzt. Die Ankerfeder ist im Lagerbereich vom Jochschenkel weg nach außen gebogen und mit ihren Haltelappen auf der glatten Oberfläche des oder der Haltezapfen befestigt, was beispielsweise aufgrund der wirksamen Kräfte durch einen Schweißvorgang oder auf eine ähnliche Weise geschehen muß. Da der Lagerpunkt des Ankers dort nicht mit der Bewegungsachse der Feder übereinstimmt, ist mit einer gewissen Lagerreibung im Ankerlager zu rechnen, was unerwünscht ist.An anchor bracket of this type is already known for a relay, which is described in DE 35 28 715 A1. There, the armature rests on the end face of the yoke leg, it having a recess in the area of a respective holding pin. The armature spring is bent outwards in the bearing area away from the yoke leg and fastened with its retaining tabs on the smooth surface of the retaining pin or pins, which must be done, for example, due to the effective forces by a welding process or in a similar manner. Since the bearing point of the armature does not coincide with the axis of movement of the spring, a certain bearing friction in the armature bearing can be expected, which is undesirable.

Ziel der vorliegenden Erfindung ist es, eine Ankerhalterung der eingangs genannten Art zu schaffen, bei der durch eine bestimmte Anker-Joch-Feder-Kombination ein sehr reib- und abriebarmes Ankerlager geschaffen wird. Der Anker samt Feder soll leicht und mit wenigen Teilen, insbesondere auch mit wenigen einfachen Arbeitsgängen montierbar sein; zugleich sollen Klemmeffekte zwischen Anker, Joch und Feder vermieden werden.The aim of the present invention is to provide an anchor bracket of the type mentioned, in which a very low-friction and abrasion-resistant anchor bearing is created by a specific anchor-yoke-spring combination. The anchor together with the spring should be easy to assemble with few parts, especially with a few simple operations; at the same time, clamping effects between anchor, yoke and spring should be avoided.

Erfindungsgemäß wird dieses Ziel mit einer Ankerhalterung der eingangs genannten Art dadurch erreicht, daß die Lagerkante zwischen der Stirnseite und der dem Kern zugewandten Breitseite des Jochschenkels gebildet ist, daß der Anker mit seiner Stirnseite an der Breitseite des Jochschenkels gelagert ist, daß die Ankerfeder mit ihrem Lagerabschnitt auf der Stirnseite des Jochschenkels aufliegt und daß der Vorspannabschnitt der Ankerfeder an dem Haltezapfen mit derartiger Vorspannung abgestützt ist, daß die zwischen dem Lagerabschnitt der Feder und der Anker-Stirnseite gebildete Lager-Innenkante gegen die Lagerkante des Jochschenkels gedrückt wird.According to the invention this goal is achieved with an anchor bracket of the type mentioned in that the bearing edge is formed between the end face and the broad side of the yoke leg facing the core, that the anchor is supported with its end face on the broad side of the yoke leg, that the anchor spring with its Bearing section rests on the end face of the yoke leg and that the biasing portion of the armature spring is supported on the holding pin with such a preload that the bearing inner edge formed between the bearing section of the spring and the armature end face is pressed against the bearing edge of the yoke leg.

Bei der erfindungsgemäßen Ankerhalterung liegt also der Anker nicht wie in den meisten herkömmlichen Fällen auf der Stirnseite des Jochschenkels auf, vielmehr ist er mit seiner Stirnseite an der Breitseite des Joches gelagert, wobei die Stirnseite des Ankers zusammen mit der Ankerfeder eine Lager-Innenkante bildet, die die von dem Ende des Jochschenkels gebildete Lagerkante umfaßt. Die Lagerachse des Ankers und die der Feder fallen damit zusammen, so daß die Reibung im Lager minimiert wird. Durch die Richtung der Kräfte, mit denen der Anker in das Lager gedrückt wird, genügt es auch, den Vorspannabschnitt der Ankerfeder einfach von der dem Anker abgewandten Jochaußenseite her in eine Kerbe oder dergleichen des Haltezapfens einzuhängen. Dadurch ergibt sich auch eine einfache Montage, da ein Schweißvorgang oder ähnliches nicht erforderlich ist. (Die Verbindung des Ankers mit der Ankerfeder durch Schweißen oder Nieten erfolgt bereits vor dessen Montage am Joch.)In the anchor holder according to the invention, the anchor does not rest on the end face of the yoke leg as in most conventional cases, rather it is supported with its end face on the broad side of the yoke, the end face of the anchor forming an inner bearing edge together with the anchor spring, which includes the bearing edge formed by the end of the yoke leg. The bearing axis of the armature and that of the spring coincide with it so that the friction in the bearing is minimized. Due to the direction of the forces with which the armature is pressed into the bearing, it is also sufficient to simply hang the prestressing section of the armature spring from the yoke outside facing away from the armature into a notch or the like of the holding pin. This also results in simple assembly, since a welding process or the like is not required. (The anchor is connected to the anchor spring by welding or riveting before it is mounted on the yoke.)

Bei der hier vorgesehenen Art der Ankerlagerung an der Breitseite des Jochschenkels kann der Anker auch ohne Einschnitte über die ganze Jochbreite mit dem Jochschenkel in Verbindung bleiben, was sich für den magnetischen Übergang gut auswirkt, weil weder die Ankerfeder noch der Haltezapfen die Lagerkante durchschneiden. Um dem Anker im Lager Bewegungsfreiheit zu verschaffen, ohne daß diese allein durch die Elastizität der Ankerfeder im Lagerbereich erzeugt werden muß, sollte die Lagerkante im Querschnitt einen kleineren Winkel als die zwischen der Ankerstirnseite und dem Lagerabschnitt der Feder gebildete Innenkante aufweisen, wobei durch Wahl des Einhängepunktes des Vorspannabschnitts der Feder an dem Haltezapfen die Rückstellkraft für den Anker vorgegeben ist. Durch Deformation des Haltezapfens, also durch eine Biegung um eine zur Lagerkante parallele Achse, kann der Einhängepunkt und damit die Rückstellkraft justiert werden. Zweckmäßigerweise greift der Vorspannabschnitt mit dem Haltezapfen kraftschlüssig in der Weise ineinander, daß er und mit ihm der Anker gegen eine Verschiebung in Richtung parallel zur Lagerachse gesichert sind.With the type of anchor bearing provided here on the broad side of the yoke leg, the anchor can remain connected to the yoke leg without cuts over the entire yoke width, which has a good effect on the magnetic transition, because neither the anchor spring nor the retaining pin cut through the bearing edge. To allow the anchor in the warehouse freedom of movement provide, without this having to be generated solely by the elasticity of the armature spring in the bearing area, the bearing edge should have a smaller cross-section than the inner edge formed between the armature end face and the bearing section of the spring, with the choice of the attachment point of the prestressing section of the spring on the Retaining pin the restoring force for the anchor is specified. The hook-in point and thus the restoring force can be adjusted by deforming the retaining pin, that is, by bending it about an axis parallel to the bearing edge. The preload section expediently interlocks with the retaining pin in such a way that it and the anchor are secured against displacement in the direction parallel to the bearing axis.

In einer bevorzugten Ausführungsform ist die Lagerkante durch den vorspringenden Haltezapfen bzw. durch zusätzliche Jochstufen in zwei voneinander getrennte Kantenabschnitte unterteilt, wobei der Lagerabschnitt der Ankerfeder entsprechend den Kantenabschnitten zwei Federstege bildet, zwischen denen der Vorspannabschnitt freigeschnitten ist. Denkbar wäre zwar auch eine umgekehrte Ausführungsform, bei der ein mittlerer Kantenabschnitt mit einem Lagerabschnitt der Ankerfeder zwischen zwei seitlichen Haltezapfen und zwei Feder-Vorspannabschnitten vorgesehen wäre, doch wäre in diesem Fall durch die schmälere Auflagebasis der Ankerfeder auf dem Jochschenkel die Stabilität der Ankerführung geringer.In a preferred embodiment, the bearing edge is divided into two separate edge sections by the projecting retaining pin or by additional yoke stages, the bearing section of the armature spring corresponding to the edge sections forming two spring bars between which the prestressing section is cut free. A reverse embodiment would also be conceivable, in which a central edge section with a bearing section of the armature spring would be provided between two lateral holding pins and two spring prestressing sections, but in this case the stability of the armature guide would be lower due to the narrower support base of the armature spring on the yoke leg.

Bei der bevorzugten Ausführungsform ist weiterhin die Ankerfeder so gestaltet, daß der Vorspannabschnitt und der Lagerabschnitt bzw. die Federstege nebeneinander an einem gemeinsamen Federendabschnitt zusammenhängen und ihre gegenseitige Vorspannung durch entgegengesetzte elastische Spreizung aus der Ebene des Federendabschnittes heraus erhalten. Dieser gemeinsame Federendabschnitt erstreckt sich zweckmäßigerweise parallel zur äußeren Breitseite des Jochschenkels, während der Lagerabschnitt und der Vorspannabschnitt der Ankerfeder jeweils versetzt zueinander jeweils L-förmig zum Anker bzw. zum Haltezapfen hin abgebogen sind. Der gemeinsame Federabschnitt erstreckt sich zweckmäßigerweise mit einem gewissen Abstand parallel zum Jochschenkel, wodurch er bei der Ankerbewegung selbst durchgebogen werden kann und eine weichere Federcharakteristik ergibt.In the preferred embodiment, the anchor spring is also designed so that the biasing portion and the bearing portion or the spring bars are adjacent to each other on a common spring end portion and get their mutual bias by opposite elastic expansion out of the plane of the spring end portion. This common spring end section expediently extends parallel to the outer broad side of the yoke leg, while the bearing section and the biasing section of the armature spring are offset in an L-shaped manner toward the anchor or toward the holding pin. The common spring section expediently extends parallel to the yoke leg at a certain distance, as a result of which it can be deflected during the armature movement and results in a softer spring characteristic.

Weiterhin ist es vorteilhaft, daß der Vorspannabschnitt durch eine Mittenausnehmung zu einem Federbügel mit verhältnismäßig geringem Querschnitt geformt ist, der in einer Einhängekerbe des Haltezapfens abgestützt ist. Der an dem Haltezapfen eingehängte Quersteg des Federbügels ist dabei bogenförmig nach innen geformt, wodurch sich die erwähnte Sicherung gegen Verschiebung in Richtung der Ankerlagerachse ergibt.It is also advantageous that the biasing portion is formed by a central recess to form a spring clip with a relatively small cross section, which is supported in a notch of the retaining pin. The transverse web of the spring clip, which is suspended on the retaining pin, is shaped in the shape of an arc inwards, as a result of which the abovementioned securing against displacement in the direction of the armature bearing axis results.

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

  • Figur 1 ein teilweise schematisch - ohne Grundkörper und Spule - dargestelltes Relais mit erfindungsgemäßer Ankerhalterung in Seitenansicht,
  • Figur 2 eine perspektivische Darstellung der Ankerhalterung an dem Relais von Figur 1,
  • Figur 3 und Figur 4 weitere Ansichten der Ankerhalterung, in Figur 1 von oben bzw. von der rechten Stirnseite her gesehen.
The invention is explained in more detail using an exemplary embodiment with reference to the drawing. It shows
  • FIG. 1 is a partially schematic - without base body and coil - shown relay with anchor holder according to the invention in side view,
  • FIG. 2 shows a perspective illustration of the armature holder on the relay from FIG. 1,
  • Figure 3 and Figure 4 further views of the anchor bracket, seen in Figure 1 from above or from the right end.

Das in der Zeichnung dargestellte Relais besitzt in einem nicht gezeichneten Grundkörper bzw. Spulenkörper einen Kern 1, der mit einem L-förmigen Joch 2 verbunden ist, wobei sich ein freier Jochschenkel 21 parallel zum Kern erstreckt. Ein Anker 3 ist an dem Jochschenkel 21 gelagert und bildet mit einer Kernpolplatte 4 einen Arbeitsluftspalt. Er ist über eine Ankerfeder 10 auf später noch zu beschreibende Weise gehalten; an der Ankerfeder 10 ist eine Kontaktfeder 11 einstückig angeformt, welche an ihrem freien Ende Kontaktstücke 5 trägt, die zwischen zwei Gegenkontaktelementen 6 und 7 umschaltbar sind. Eine in Figur 4 gestrichelt angedeutete zweite Kontaktfeder 11a kann beispielsweise zur Brücken- oder Doppelkontaktgabe dienen. Die Stromzufuhr zur Kontaktfeder erfolgt über eine Litze 8 und ein weiter nicht dargestelltes Anschlußelement. Der Anker 3 ist mit seiner Stirnseite an die dem Kern zugewandte Breitfläche des Jochschenkels 21 gekoppelt. Dabei bildet der Jochschenkel an seiner Stirnseite eine Lagerkante 22, welche allerdings in Form von zwei Kantenabschnitten nur an den Außenbereichen des Jochschenkels 21 ausgebildet ist. Die im Lagerbereich rahmenförmig ausgeschnittene Ankerfeder 10 besitzt einen Lagerabschnitt in Form zweier Federstege 12, welche auf der vom Kern abgewandten Außenseite des Ankers 3 aufliegend befestigt sind, beispielsweise durch Niete 31. Die Federstege 12 bilden mit der Stirnseite des Ankers 3 eine Innenkante 32, die auf der Lagerkante 22 aufliegt. Dabei ist die Stirnseite 23 des Jochschenkels 21 leicht angeschrägt, so daß die Lagerkante 22 im Querschnitt einen Winkel von etwas weniger als 90° besitzt, um die freie Beweglichkeit des Ankers 3 mit den Federstegen 12 auf der Lagerkante 22 zu gewährleisten. Die Ankerfeder 10 besteht vorzugsweise aus einem härteren Werkstoff als das Weicheisen des Joches 2, beispielsweise aus nicht rostendem Stahl. Auf diese Weise ergibt sich durch die Werkstoffpaarung des Joches einerseits und der Ankerfeder andererseits eine gute Lagereigenschaft.The relay shown in the drawing has a core 1 in a base body or coil body, not shown, which is connected to an L-shaped yoke 2, a free yoke leg 21 extending parallel to the core. An armature 3 is mounted on the yoke leg 21 and forms a working air gap with a core pole plate 4. It is held by an anchor spring 10 in a manner to be described later; On the armature spring 10, a contact spring 11 is integrally formed, which contact pieces at its free end 5 carries, which are switchable between two counter-contact elements 6 and 7. A second contact spring 11a, indicated by dashed lines in FIG. 4, can be used, for example, to make bridges or double contacts. The power supply to the contact spring takes place via a strand 8 and a connection element, not shown. The end face of the armature 3 is coupled to the broad surface of the yoke leg 21 facing the core. Here, the yoke leg forms a bearing edge 22 on its end face, which is, however, formed in the form of two edge sections only on the outer regions of the yoke leg 21. The armature spring 10, which is cut out in the form of a frame in the bearing area, has a bearing section in the form of two spring bars 12 which are fastened to rest on the outside of the armature 3 facing away from the core, for example by rivets 31. The spring bars 12 form an inner edge 32 with the end face of the armature 3, which rests on the bearing edge 22. The end face 23 of the yoke leg 21 is slightly chamfered, so that the bearing edge 22 has an angle of slightly less than 90 ° in cross section in order to ensure the free movement of the armature 3 with the spring bars 12 on the bearing edge 22. The armature spring 10 is preferably made of a harder material than the soft iron of the yoke 2, for example of stainless steel. In this way, the material pairing of the yoke on the one hand and the armature spring on the other hand results in a good bearing property.

Zwischen den beiden Federstegen 12 ist der Jochschenkel 21 geringfügig verlängert und bildet so jeweils Jochstufen 24, welche den Anker gegen seitliche Stöße sichern und zusätzlich die magnetische Kopplung des Ankers 3 zum Jochschenkel 21 verbessern. Die Breite der Jochstufen 24 ist jedoch so gewählt, daß jeweils ein Abstand zu den Federstegen 12 verbleibt, um eine Reibbewegung zwischen den Federstegen und der Jochstufe zu vermeiden.Between the two spring bars 12, the yoke leg 21 is slightly extended and thus forms yoke steps 24, which secure the armature against lateral impact and additionally improve the magnetic coupling of the armature 3 to the yoke leg 21. However, the width of the yoke steps 24 is selected such that a distance to the spring bars 12 remains in each case in order to avoid a frictional movement between the spring bars and the yoke step.

Weiterhin besitzt der Jochschenkel 21 in Verlängerung seiner Stirnseite und in der Mitte zwischen den beiden Jochstufen 24 einen vorspringenden Haltezapfen 25, der eine Kerbe 26 zum Einhängen eines Vorspannabschnittes 13 der Ankerfeder aufweist. Dieser Vorspannabschnitt 13 ist durch eine mittige Ausnehmung 17 zu einem Federbügel mit verhältnismäßig schmaler Stegbreite und damit geringem Querschnitt ausgebildet, so daß er eine weiche Federcharakteristik aufweist. Der in der Einhängekerbe 26 des Haltezapfens liegende Quersteg 14 des Federbügels ist außerdem bogenförmig nach innen gezogen, wodurch der Federbügel und mit ihm der Anker zentriert wird. An dem Quersteg 14 ist außerdem eine Montagelasche 15 angeformt, mit deren Hilfe der Federbügel bei der Montage ergriffen und eingehängt werden kann.Furthermore, the yoke leg 21 has, in the extension of its end face and in the middle between the two yoke stages 24, a projecting retaining pin 25 which has a notch 26 for hanging in a prestressing section 13 of the armature spring. This biasing section 13 is formed by a central recess 17 to form a spring clip with a relatively narrow web width and thus a small cross section, so that it has a soft spring characteristic. The transverse web 14 of the spring clip located in the hooking notch 26 of the retaining pin is also drawn inward in an arc shape, as a result of which the spring clip and with it the anchor are centered. On the crossbar 14, a mounting bracket 15 is also formed, with the help of which the spring clip can be gripped and hung during assembly.

Der vom Anker abgewandte Federendabschnitt 16 der Ankerfeder, der die Federstege 12 mit dem Federbügel 13 verbindet, erstreckt sich parallel zum Jochschenkel 21 an dessen vom Kern abgewandter Außenseite, und zwar mit einem Abstand von dem Jochschenkel. Dadurch kann sich dieser Federendschnitt 16 bei der Ankerbewegung durchbiegen, so daß die Federcharakteristik insgesamt weicher wird. Aus der Ebene des Federendabschnittes 16 sind also die den Lagerabschnitt bildenden Federstege 12 und der Federbügel 13 jeweils etwa rechtwinkelig in Richtung auf den Anker abgebogen, allerdings zueinander versetzt. Dadurch entfalten sich Vorspannkräfte F1 und F2 mit einem durch die Entfernung der Einhängekerbe 26 zur Lagerkante 22 gebildeten Hebelarm. Durch die entgegengesetzte Auseinanderspreizung der Federstege 12 einerseits und des Federbügels 13 andererseits aus der gemeinsamen Federebene des Federendabschnittes 16 wird die Anker-Ankerfeder-Kombination mit den Kräften F1 und F2 in zwei Richtungen gegen die Lagerkante 22 gedrückt. Zusätzlich wird durch die Lage des Einhängepunktes in der Kerbe 26 ein Vorspannmoment für den Anker bezüglich seines Drehpunktes an der Innenkante 32 erzeugt, wodurch die Ruhekontaktkraft bestimmt wird. Durch eine Justierkerbe 27 ist der Haltezapfen 25 im Querschnitt so geschwächt, daß er entlang dem Doppelpfeil 28 deformiert werden kann, um den Einhängepunkt in der Kerbe 26 und damit die Vorspannung einzustellen.The spring end section 16 of the armature spring facing away from the armature, which connects the spring bars 12 to the spring clip 13, extends parallel to the yoke leg 21 on its outer side facing away from the core, namely at a distance from the yoke leg. This allows this spring end cut 16 to bend during the armature movement, so that the spring characteristic is softer overall. From the plane of the spring end section 16, the spring webs 12 and the spring clip 13 forming the bearing section are each bent approximately at right angles in the direction of the armature, but offset from one another. Preloading forces F1 and F2 thereby develop with a lever arm formed by the removal of the hanging notch 26 from the bearing edge 22. Due to the opposite spreading apart of the spring bars 12 on the one hand and the spring clip 13 on the other hand from the common spring plane of the spring end section 16, the armature-armature-spring combination with the forces F1 and F2 is pressed against the bearing edge 22 in two directions. In addition, the position of the attachment point in the notch 26 generates a prestressing moment for the armature with respect to its pivot point on the inner edge 32, as a result of which the rest contact force is determined. The retaining pin 25 is weakened in cross section by an adjusting notch 27 so that it can be deformed along the double arrow 28 in order to set the hooking point in the notch 26 and thus the pretension.

Claims (11)

Ankerhalterung für ein elektromagnetisches Relais mit einem parallel zu einem Spulenkern (1) angeordneten flachen Jochschenkel (21), der an seiner Stirnseite (23) eine Lagerkante (22) für einen plattenförmigen Anker (3) sowie mindestens einen über die Stirnseite vorspringenden Haltezapfen (25) bildet, wobei der Anker annähernd rechtwinkelig zum Jochschenkel angeordnet ist und mit dem Spulenkern einen Arbeitsluftspalt bildet, ferner mit einer aus Blech geformten Ankerfeder (10), welche mit einem Lagerabschnitt (12) auf der dem Spulenkern (1) abgewandten Ankerseite flach aufliegend befestigt ist und mit einem Vorspannabschnitt (13) an dem Haltezapfen (25) gehalten ist, dadurch gekennzeichnet, daß die Lagerkante (22) zwischen der Stirnseite (23) und der dem Kern zugewandten Breitseite des Jochschenkels (21) gebildet ist, daß der Anker (3) mit seiner Stirnseite an der Breitseite des Jochschenkels (21) gelagert ist, daß die Ankerfeder (10) mit ihrem Lagerabschnitt (12) auf der Stirnseite des Jochschenkels (21) aufliegt und daß der Vorspannabschnitt (13) der Ankerfeder an dem Haltezapfen (25) mit derartiger Vorspannung abgestutzt ist, daß die zwischen dem Lagerabschnitt (12) der Feder und der Anker-Stirnseite gebildete Lager-Innenkante (32) gegen die Lagerkante (22) des Jochschenkels gedrückt wird.Armature holder for an electromagnetic relay with a flat yoke leg (21) arranged parallel to a coil core (1), which has on its end face (23) a bearing edge (22) for a plate-shaped armature (3) and at least one retaining pin (25) projecting over the end face ) forms, wherein the armature is arranged approximately at right angles to the yoke leg and forms a working air gap with the coil core, further with an armature spring (10) formed from sheet metal, which is fastened flat lying with a bearing section (12) on the armature side facing away from the coil core (1) and is held with a prestressing section (13) on the holding pin (25), characterized in that the bearing edge (22) is formed between the end face (23) and the broad side of the yoke leg (21) facing the core such that the armature ( 3) is mounted with its end face on the broad side of the yoke leg (21) that the armature spring (10) with its bearing section (12) on the forehead side of the yoke leg (21) rests and that the biasing section (13) of the armature spring on the retaining pin (25) is supported with such a preload that the bearing inner edge (32) formed between the bearing section (12) of the spring and the end face of the armature is pressed against the bearing edge (22) of the yoke leg. Ankerhalterung nach Anspruch 1, dadurch gekennzeichnet, daß die Lagerkante (22) im Querschnitt einen kleineren Winkel als die zwischen Ankerinnenseite und Lagerabschnitt der Feder gebildete Innenkante (32) aufweist und daß durch Festlegung des Einhängepunktes (26) des Vorspannabschnittes (13) der Feder an dem Haltezapfen (25) eine Rückstellkraft für den Anker (3) vorgegeben ist.Anchor bracket according to claim 1, characterized in that the bearing edge (22) has a smaller cross-section than the inner edge (32) formed between the inside of the anchor and the bearing section of the spring, and that the spring is attached by fixing the point of attachment (26) of the prestressing section (13) the retaining pin (25) is given a restoring force for the armature (3). Ankerhalterung nach Anspruch 2, dadurch gekennzeichnet, daß der Lagerabschnitt (12) der Ankerfeder (10) mit der gelagerten Stirnseite des Ankers einen rechten Winkel bildet und daß die Lagerkante (22) des Jochschenkels durch eine Abschrägung der Jochstirnseite (23) einen Querschnittswinkel von weniger als 90° besitzt.Anchor holder according to claim 2, characterized in that the bearing section (12) of the anchor spring (10) is at a right angle with the mounted end face of the anchor forms and that the bearing edge (22) of the yoke leg has a cross-sectional angle of less than 90 ° by chamfering the yoke face (23). Ankerhalterung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Einhängepunkt (26) des Vorspannabschnitts (13) durch Deformation des Haltezapfens (25) verstellbar ist.Anchor holder according to one of claims 1 to 3, characterized in that the suspension point (26) of the pretensioning section (13) can be adjusted by deforming the holding pin (25). Ankerhalterung nach Anspruch 4, dadurch gekennzeichnet, daß der Haltezapfen (25) im Bereich zwischen dem Einhängepunkt (26) des Vorspannabschnittes (13) und dem Übergang zum Jochschenkel (21) eine Justierkerbe (27) aufweist.Anchor holder according to claim 4, characterized in that the holding pin (25) has an adjusting notch (27) in the area between the hooking point (26) of the prestressing section (13) and the transition to the yoke leg (21). Ankerhalterung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Vorspannabschnitt (13) und der Lagerabschnitt (12)nebeneinander an einem gemeinsamen Federendabschnitt (16) der Ankerfeder zusammenhängen und ihre Vorspannung durch entgegengesetzte elastische Spreizung aus der Ebene des Federendabschnittes (16) erhalten.Anchor holder according to one of claims 1 to 5, characterized in that the prestressing section (13) and the bearing section (12) are connected side by side on a common spring end section (16) of the anchor spring and their prestressing by means of opposite elastic expansion from the plane of the spring end section (16) receive. Ankerhalterung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Lagerkante (22) in zwei voneinander getrennte Kantenabschnitte unterteilt ist, zwischen denen der Haltezapfen (25) an dem Jochschenkel (21) angeformt ist und daß der Lagerabschnitt (12) der Ankerfeder (10) entsprechend den Kantenabschnitten zwei Federstege (12) bildet, zwischen denen der Vorspannabschnitt (13) freigeschnitten ist.Anchor holder according to one of claims 1 to 6, characterized in that the bearing edge (22) is divided into two mutually separate edge sections, between which the retaining pin (25) is integrally formed on the yoke leg (21) and that the bearing section (12) of the anchor spring (10) forms two spring bars (12) corresponding to the edge sections, between which the prestressing section (13) is cut free. Ankerhalterung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß der gemeinsame Federendabschnitt (16) sich parallel zur Breitseite des Jochschenkels (21) erstreckt und daß der Lagerabschnitt (12) und der Vorspannabschnitt (13) jeweils versetzt zueinander L-förmig zum Anker (3) bzw. zum Haltezapfen (25) hin abgebogen sind.Anchor holder according to claim 6 or 7, characterized in that the common spring end section (16) extends parallel to the broad side of the yoke leg (21) and that the bearing section (12) and the prestressing section (13) are each offset L-shaped to the anchor (3 ) or bent towards the retaining pin (25). Ankerhalterung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß der Vorspannabschnitt (13) durch eine Mittenausnehmung zu einem Federbügel geformt ist, der in einer Einhängekerbe (26) des Haltezapfens (25) abgestützt ist.Anchor holder according to claim 7 or 8, characterized in that the prestressing section (13) is formed by a central recess to form a spring clip which is supported in a hook-in notch (26) of the retaining pin (25). Ankerhalterung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Vorspannabschnitt (13) an dem Haltezapfen (25) durch kraftschlüssiges Ineinandergreifen gegen eine Verschiebung in Richtung parallel zur Lagerkante (22) gesichert ist.Anchor holder according to one of claims 1 to 9, characterized in that the prestressing section (13) on the holding pin (25) is secured against displacement in the direction parallel to the bearing edge (22) by a force-locking interlocking. Ankerhalterung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß an der Ankerfeder (10) eine über das bewegliche Ankerende hinausragende Kontaktfeder (11) einstückig angeformt ist.Anchor holder according to one of claims 1 to 10, characterized in that a contact spring (11) projecting beyond the movable anchor end is integrally formed on the anchor spring (10).
EP95110514A 1994-08-19 1995-07-05 Armature holding structure for an electromagnetic relay Expired - Lifetime EP0697706B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4429552 1994-08-19
DE4429552A DE4429552A1 (en) 1994-08-19 1994-08-19 Anchor bracket for an electromagnetic relay

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EP0697706A2 true EP0697706A2 (en) 1996-02-21
EP0697706A3 EP0697706A3 (en) 1998-02-25
EP0697706B1 EP0697706B1 (en) 1999-10-13

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EP (1) EP0697706B1 (en)
JP (1) JPH0869736A (en)
DE (2) DE4429552A1 (en)

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Also Published As

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DE4429552A1 (en) 1996-02-22
DE59507034D1 (en) 1999-11-18
EP0697706A3 (en) 1998-02-25
EP0697706B1 (en) 1999-10-13
JPH0869736A (en) 1996-03-12
US5534834A (en) 1996-07-09

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