EP0374304B1 - Electromagnetic relay - Google Patents

Electromagnetic relay Download PDF

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Publication number
EP0374304B1
EP0374304B1 EP88121581A EP88121581A EP0374304B1 EP 0374304 B1 EP0374304 B1 EP 0374304B1 EP 88121581 A EP88121581 A EP 88121581A EP 88121581 A EP88121581 A EP 88121581A EP 0374304 B1 EP0374304 B1 EP 0374304B1
Authority
EP
European Patent Office
Prior art keywords
armature
spring
yoke
bearing
bearing plate
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
EP88121581A
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German (de)
French (fr)
Other versions
EP0374304A1 (en
Inventor
Herbert Mitschik
Fritz Hinrichs
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE8888121581T priority Critical patent/DE3882049D1/en
Priority to EP88121581A priority patent/EP0374304B1/en
Priority to ES198888121581T priority patent/ES2040826T3/en
Priority to AT88121581T priority patent/ATE91041T1/en
Priority to JP1324132A priority patent/JPH02226632A/en
Publication of EP0374304A1 publication Critical patent/EP0374304A1/en
Priority to US07/649,266 priority patent/US5065127A/en
Application granted granted Critical
Publication of EP0374304B1 publication Critical patent/EP0374304B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 electromagnetic relay with coil, core and yoke and with a flat armature mounted on a free end of the yoke and with a leaf spring for storing and resetting the armature, the leaf spring forming a bearing plate which rests on an outer surface of the yoke and protrudes over the end of the yoke in such a way that a bearing notch for a bearing edge of the armature is formed between the end face of the yoke and the bearing plate, and a return spring is integrally formed on the bearing plate, which engages around the bearing edge of the armature and with one opposite to the bearing plate extending portion engages in a recess of the armature.
  • the softer return spring should also take up as little space as possible and be easy to manufacture and assemble.
  • the return spring has a first section which is cut out in the form of a straight spring tongue from the central region of the bearing plate and divides the bearing plate into two plate sections on which the armature rests only with lateral regions of its bearing edge, and in that the return spring has a second section bent toward the armature and cut in a U-shape in the bent leaf spring plane, which extends with approximately the same shape on both sides of a plane of symmetry intersecting the spring tongue.
  • An essential element of the anchor bearing according to the invention is the specially shaped leaf spring, which performs various functions.
  • the return spring consists - if you look at it stretched into a sheet metal plane - from a straight section in the area of the bearing plate and a substantially symmetrical, approximately ring-shaped section with respect to the axis of the straight section, whereby the overall shape of a question mark is formed.
  • the central cut-out of the tongue-shaped spring section of the return spring from the bearing plate itself also ensures that the contact surface of the armature on the remaining lateral plate sections is considerably reduced, so that the bearing friction becomes small overall.
  • a further reduction in the bearing friction is achieved if the edges of the plate sections facing the spring tongue are bent away from the armature by a small angle, so that the bearing surface for the armature is further reduced; in addition, it is definitely avoided in this way that a sharp Edge of the bearing plate comes into contact with the bearing edge of the anchor.
  • the return spring requires little space, since a substantial part of the spring length is already in the area of the bearing plate and therefore does not require any additional volume.
  • the arcuate or annular end section of the return spring encompasses the armature and projects beyond it, it is expedient to have it run parallel to the armature on the outside. In this way, the bearing and return spring requires practically no space beyond the armature space.
  • the bearing plate expediently has molded-in fastening tabs on both sides, which encompass the yoke, each mounting tab being guided in a recess in the yoke and suspended at its free end in each case at both corners with a latching lug on the edge of the recess.
  • this double attachment of the fastening tabs for the bearing plate has the advantage that the entire leaf spring and thus the armature are positioned more precisely, which in turn ensures the response reliability with the lowest possible excitation power.
  • the recess in the armature is expediently designed as a continuous window, the tip of the return spring resting on an inner wall of the window. In this way, the armature with its recess is easier to manufacture.
  • bent-up limiting lugs are formed on the long sides of the bearing plate on both sides of the armature. At most, the anchor abuts these lateral limiting tabs in a point-like manner in its axis of rotation, so that even when the anchor is displaced from its central mounting, for example by a shock, there is hardly any increase in friction.
  • end-side limiting tabs can also be provided on the end faces of the plate sections.
  • the leaf spring expediently consists of magnetically highly conductive steel, for example a chromium-nickel steel, so that the conduction of the magnetic flux through the bearing is improved.
  • the relay shown in FIG. 1 has a magnet system with a coil 1, an angular yoke 2, a core 3 and a plate-shaped armature 4 mounted on the free yoke end 2a, which forms a working air gap with the core 3.
  • the armature 4 actuates a U-shaped contact spring 6 via a rod-shaped slide 5, which can be switched between fixed mating contact elements 7.
  • the contact spring 6 and the mating contact elements 7 are anchored in a base body 8, which together with a cap 9 forms a housing for the relay.
  • a leaf spring 10 which is now described in more detail with reference to FIGS. 2 to 5, is used for storing and resetting the armature.
  • This leaf spring 10 has a section 11 resting on the yoke end 2a, which serves as a bearing plate and protrudes beyond the yoke end 2a.
  • two side plate sections 12 are formed which, with the end edge 2b of the yoke (FIG. 2), form an approximately rectangular bearing notch, in which the armature with its bearing edge or cut to an acute angle Bearing edge 4b lies. Due to the central free cut, the anchor rests only on relatively short distances of the plate sections 12, so that there is little bearing friction.
  • the plate sections 12 each have boundary tabs 14 bent open opposite the side edges of the armature, against which the armature abuts when it should be moved from the center, for example by an impact. However, the armature only abuts these limiting tabs 14 in the area of its axis of rotation, so that the friction is not significantly increased.
  • end-side limiting tabs 15 are bent upwards, which also catch the armature in the event of impacts in the direction perpendicular to the axis of rotation or parallel to the coil axis.
  • the leaf spring Since the leaf spring also serves to return the armature to its rest position, it has an integrally formed return spring 16, which approximately has the shape of a question mark when projected into a plane.
  • a tongue-shaped straight section 16a is cut free in the center of the bearing plate, that is, between the plate sections 12, which results in an elongated soft spring without requiring additional space.
  • the approximately ring-shaped section 16b of the return spring runs approximately symmetrically to the central axis of the tongue section 16a, the tip 16c, which is returned to the armature, pointing almost again towards the center towards the tongue-shaped section 16a.
  • the entire annular portion 16b is bent around the armature end and extends largely parallel to the outside of the armature, so that the spring does not take up any additional space when one takes into account the already necessary freedom of movement for the armature in the housing.
  • the tip 16c of the return spring engages in a window-shaped opening 4c of the armature and lies on an inner wall of the window such that a restoring moment is exerted on the armature around the bearing edge 4b.
  • 2 shows the anchor in the fallen-off state with solid lines, while the dash-dotted lines show the anchor in the drawn-in state.
  • the leaf spring is hooked onto the yoke by means of two laterally formed fastening tabs 17 which grip around the yoke on both sides.
  • the fastening tabs 17 lie in recesses 2c of the yoke.
  • the ends of the tabs 17 are widened on both sides and thus form locking lugs 18 with which the fastening tabs are hooked onto the edges of the cutouts 2c on both sides.
  • This double detent results in a very precise and secure positioning of the bearing plate sections 12 and the return spring 16.
  • the angled ends 19 of the fastening tabs make it easy to attach them to the yoke without additional special tools.
  • the leaf spring 10 is first placed on the yoke (see FIG. 2).
  • the anchor is then installed, the spring section 16b or 16c first being bent back and then inserted into the window 4c of the anchor.
  • the arc section 16d which initially projects upwards due to its shape (see FIG. 2), is bent downward after the insertion of the armature by the prestress (see 16d ′ in FIG. 2), so that the space required for the spring is further reduced.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Locating Faults (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

For mounting the armature at the free end of the yoke, the relay has a leaf spring (10) which forms on the one hand a bearing plate (11) resting on the yoke and on the other hand a restoring spring (16) formed on in one piece. The restoring spring is cut free with a first section (16a) out of the centre of the bearing plate (11) so that the bearing plate is divided into two plate sections (12) on which the armature rests solely with lateral regions of its bearing edge. In addition, the restoring spring is cut at its free end in an arc shape approximately symmetrically in respect of the central axis of the bearing plate. In this way, an approximately symmetrical restoring force acting on the armature is obtained. <IMAGE>

Description

Die Erfindung betrifft ein elektromagnetisches Relais mit Spule, Kern und Joch sowie mit einem an einem freien Ende des Joches gelagerten flachen Anker und mit einer Blattfeder zur Lagerung und Rückstellung des Ankers, wobei die Blattfeder eine Lagerplatte bildet, welche auf einer Außenoberfläche des Joches aufliegt und über das Ende des Joches derart vorsteht, daß zwischen der Stirnfläche des Joches und der Lagerplatte eine Lagerkerbe für eine Lagerkante des Ankers gebildet wird und wobei an der Lagerplatte einstückig eine Rückstellfeder angeformt ist, die die Lagerkante des Ankers umgreift und mit einem sich gegenläufig zur Lagerplatte erstreckenden Abschnitt in eine Ausnehmung des Ankers eingreift.The invention relates to an electromagnetic relay with coil, core and yoke and with a flat armature mounted on a free end of the yoke and with a leaf spring for storing and resetting the armature, the leaf spring forming a bearing plate which rests on an outer surface of the yoke and protrudes over the end of the yoke in such a way that a bearing notch for a bearing edge of the armature is formed between the end face of the yoke and the bearing plate, and a return spring is integrally formed on the bearing plate, which engages around the bearing edge of the armature and with one opposite to the bearing plate extending portion engages in a recess of the armature.

Ein derartiges Relais ist aus der EP-A-0 251 034 bekannt. In einer der dort gezeigten Ausführungsformen, bei der die Lagerplatte und die Rückstellfeder bereits einteilig ausgeführt sind, ergibt sich jedoch das Problem, daß die erst am Ende der Lagerplatte angeformte Rückstellfeder verhältnismäßig viel Platz braucht, um eine große Federlänge und dadurch eine weiche Federcharakteristik zu erzielen. Trotzdem ist die dort gezeigte Feder noch verhältnismäßig hart. Da auch die Reibung im Bereich der Ankerlagerung dort noch verhältnismäßig hoch ist, kann die Rückstellfeder auch nicht beliebig weich gemacht werden. Die verhältnismäßig große Reibung und die verhältnismäßig harte Rückstellfeder bedingen auch eine größere Auslegung des Magnetsystems, um ein sicheres Ansprechen zu gewährleisten. Die Ansprechleistung sollte jedoch möglichst gering gehalten werden.Such a relay is known from EP-A-0 251 034. In one of the embodiments shown there, in which the bearing plate and the return spring are already made in one piece, the problem arises that the return spring which is only formed at the end of the bearing plate requires a relatively large amount of space in order to achieve a long spring length and thereby a soft spring characteristic . Nevertheless, the spring shown there is still relatively hard. Since the friction in the area of the armature bearing is still relatively high there, the return spring cannot be made as soft as desired. The relatively large friction and the relatively hard return spring also require a larger design of the magnet system in order to ensure a reliable response. However, the response power should be kept as low as possible.

Deshalb ist es Aufgabe der Erfindung, bei einem Relais der eingangs genannten Art die Ankerlagerung mit einer neu gestalteten Lagerfeder zu verbesssern, so daß mit geringerer Lagerreibung und einer weicheren Rückstellfeder die Ansprecherregung kleiner gemacht werden kann. Die weichere Rückstellfeder soll dabei auch möglichst wenig Platz beanspruchen und leicht herzustellen bzw. zu montieren sein.It is therefore an object of the invention to improve the armature mounting with a newly designed bearing spring in a relay of the type mentioned at the outset, so that the response to excitation is lower with less bearing friction and a softer return spring can be made. The softer return spring should also take up as little space as possible and be easy to manufacture and assemble.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Rückstellfeder einen ersten Abschnitt besitzt, der in Form einer geraden Federzunge aus dem Mittenbereich der Lagerplatte freigeschnitten ist und die Lagerplatte in zwei Plattenabschnitte unterteilt, auf denen der Anker lediglich mit seitlichen Bereichen seiner Lagerkante aufliegt, und daß die Rückstellfeder einen zum Anker hin abgebogenen und in der abgebogenen Blattfederebene U-förmig geschnittenen zweiten Abschnitt besitzt, der sich mit annähernd gleicher Form zu beiden Seiten einer die Federzunge schneidenden Symmetrieebene erstreckt.According to the invention this object is achieved in that the return spring has a first section which is cut out in the form of a straight spring tongue from the central region of the bearing plate and divides the bearing plate into two plate sections on which the armature rests only with lateral regions of its bearing edge, and in that the return spring has a second section bent toward the armature and cut in a U-shape in the bent leaf spring plane, which extends with approximately the same shape on both sides of a plane of symmetry intersecting the spring tongue.

Wesentliches Element der erfindungsgemäßen Ankerlagerung ist also die speziell geformte Blattfeder, die verschiedene Funktionen erfüllt. Die Rückstellfeder besteht dabei - wenn man sie in eine Blechebene gestreckt betrachtet - aus einem geraden Abschnitt im Bereich der Lagerplatte und einem zur Achse des geraden Abschnitts im wesentlichen symmetrischen, annähernd ringförmigen Abschnitt, wodurch insgesamt die Form eines Fragezeichens gebildet ist. Auf diese Weise erhält man nicht nur eine große Federlänge bei geringem Platzbedarf, sondern man erreicht auch, daß die Feder am Anker in der Nähe von dessen Mittelachse angreift, so daß die Lagerkräfte annähernd symmetrisch verteilt werden. Durch den mittigen Ausschnitt des zungenförmigen Federabschnittes der Rückstellfeder aus der Lagerplatte selbst wird zudem erreicht, daß die Auflagefläche des Ankers auf den verbleibenden seitlichen Plattenabschnitten erheblich verringert wird, so daß die Lagerreibung insgesamt klein wird.An essential element of the anchor bearing according to the invention is the specially shaped leaf spring, which performs various functions. The return spring consists - if you look at it stretched into a sheet metal plane - from a straight section in the area of the bearing plate and a substantially symmetrical, approximately ring-shaped section with respect to the axis of the straight section, whereby the overall shape of a question mark is formed. In this way, not only is a large spring length obtained with a small footprint, but it is also achieved that the spring engages the armature in the vicinity of its central axis, so that the bearing forces are distributed approximately symmetrically. The central cut-out of the tongue-shaped spring section of the return spring from the bearing plate itself also ensures that the contact surface of the armature on the remaining lateral plate sections is considerably reduced, so that the bearing friction becomes small overall.

Eine weitere Verringerung der Lagerreibung erreicht man, wenn die der Federzunge zugewandten Kanten der Plattenabschnitte um einen kleinen Winkel vom Anker weg aufgebogen sind, so daß die Auflagefläche für den Anker weiter verkleinert wird; außerdem wird auf diese Weise auf jeden Fall vermieden, daß eine scharfe Kante der Lagerplatte mit der Lagerkante des Ankers in Berührung kommt.A further reduction in the bearing friction is achieved if the edges of the plate sections facing the spring tongue are bent away from the armature by a small angle, so that the bearing surface for the armature is further reduced; in addition, it is definitely avoided in this way that a sharp Edge of the bearing plate comes into contact with the bearing edge of the anchor.

Die Rückstellfeder benötigt, wie bereits erwähnt, nur wenig Platz, da ein wesentlicher Teil der Federlänge bereits im Bereich der Lagerplatte liegt und somit kein zusätzliches Volumen benötigt. Soweit der bogenförmige oder ringförmige Endabschnitt der Rückstellfeder den Anker umfaßt und über diesen hinaussteht, ist es zweckmäßig, ihn an der Außenseite parallel zum Anker verlaufen zu lassen. Auf diese Weise benötigt die Lager-und Rückstellfeder praktisch keinen über den Ankerraum hinausgehenden Platz.As already mentioned, the return spring requires little space, since a substantial part of the spring length is already in the area of the bearing plate and therefore does not require any additional volume. Insofar as the arcuate or annular end section of the return spring encompasses the armature and projects beyond it, it is expedient to have it run parallel to the armature on the outside. In this way, the bearing and return spring requires practically no space beyond the armature space.

Zweckmäßigerweise besitzt die Lagerplatte beiderseits angeformte Befestigungslappen, die das Joch umgreifen, wobei jeder Befestigungslappen in einer Aussparung des Joches geführt ist und an seinem freien Ende jeweils an beiden Ecken mit je einer Rastnase am Rand der Aussparung eingehängt ist. Gegenüber der aus der EP-A-0 251 034 hat diese doppelte Einhängung der Befestigungslappen für die Lagerplatte den Vorteil, daß die gesamte Blattfeder und damit auch der Anker exakter positioniert werden, wodurch wiederum die Ansprechsicherheit bei kleinstmöglicher Erregerleistung sichergestellt ist. Die Ausnehmung im Anker wird zweckmäßigerweise als durchgehendes Fenster ausgebildet, wobei die Spitze der Rückstellfeder auf einer Innenwand des Fensters aufliegt. Auf diese Weise ist der Anker mit seiner Ausnehmung einfacher zu fertigen.The bearing plate expediently has molded-in fastening tabs on both sides, which encompass the yoke, each mounting tab being guided in a recess in the yoke and suspended at its free end in each case at both corners with a latching lug on the edge of the recess. Compared to that from EP-A-0 251 034, this double attachment of the fastening tabs for the bearing plate has the advantage that the entire leaf spring and thus the armature are positioned more precisely, which in turn ensures the response reliability with the lowest possible excitation power. The recess in the armature is expediently designed as a continuous window, the tip of the return spring resting on an inner wall of the window. In this way, the armature with its recess is easier to manufacture.

Zur Erhöhung der Funktionssicherheit ist weiterhin in einer zweckmäßigen Ausführungsform vorgesehen, daß an den Längsseiten der Lagerplatte zu beiden Seiten des Ankers hochgebogene Begrenzungslappen angeformt sind. An diesen seitlichen Begrenzungslappen stößt der Anker allenfalls punktförmig in seiner Drehachse an, so daß selbst bei einer Verschiebung des Ankers aus seiner mittigen Lagerung, etwa durch einen Stoß, kaum eine Erhöung der Reibung auftritt. Als zusätzliche Stoßsicherung können auch an den Stirnseiten der Plattenabschnitte stirnseitige Begrenzungslappen vorgesehen werden.In order to increase the functional reliability, it is further provided in an expedient embodiment that bent-up limiting lugs are formed on the long sides of the bearing plate on both sides of the armature. At most, the anchor abuts these lateral limiting tabs in a point-like manner in its axis of rotation, so that even when the anchor is displaced from its central mounting, for example by a shock, there is hardly any increase in friction. As an additional shock protection, end-side limiting tabs can also be provided on the end faces of the plate sections.

Die Blattfeder besteht zweckmäßigerweise aus magnetisch gut leitendem Stahl, beispielsweise einem Chrom-Nickel-Stahl, so daß die Leitung des magnetischen Flusses über die Lagerung verbessert wird.The leaf spring expediently consists of magnetically highly conductive steel, for example a chromium-nickel steel, so that the conduction of the magnetic flux through the bearing is improved.

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

  • FIG 1 ein erfindungsgemäßes Relais in Seitenansicht mit aufgeschnittenem Gehäuse,
  • FIG 2 bis 4 die Lagerung des Ankers aus FIG 1 in vergrößerter Darstellung in drei unterschiedlichen Ansichten,
  • FIG 5 die Lager- und Rückstellfeder des Relais in perspektivischer Ansicht.
The invention is explained in more detail using an exemplary embodiment with reference to the drawing. It shows
  • 1 shows a relay according to the invention in a side view with the housing cut open,
  • 2 to 4 show the mounting of the armature from FIG. 1 in an enlarged representation in three different views,
  • 5 shows the bearing and return spring of the relay in a perspective view.

Das in FIG 1 dargestellte Relais besitzt ein Magnetsystem mit einer Spule 1, einem winkelförmigen Joch 2, einem Kern 3 und einem an dem freien Jochende 2a gelagerten plattenförmigen Anker 4, der mit dem Kern 3 einen Arbeitsluftspalt bildet. Der Anker 4 betätigt über einen stangenförmigen Schieber 5 eine U-förmige Kontaktfeder 6, welche zwischen feststehenden Gegenkontaktelementen 7 umschaltbar ist. Die Kontaktfeder 6 sowie die Gegenkontaktelemente 7 sind in einem Grundkörper 8 verankert, der zusammen mit einer Kappe 9 ein Gehäuse für das Relais bildet.The relay shown in FIG. 1 has a magnet system with a coil 1, an angular yoke 2, a core 3 and a plate-shaped armature 4 mounted on the free yoke end 2a, which forms a working air gap with the core 3. The armature 4 actuates a U-shaped contact spring 6 via a rod-shaped slide 5, which can be switched between fixed mating contact elements 7. The contact spring 6 and the mating contact elements 7 are anchored in a base body 8, which together with a cap 9 forms a housing for the relay.

Zur Lagerung und Rückstellung des Ankers dient eine Blattfeder 10, die anhand der FIG 2 bis 5 nunmehr näher beschrieben wird. Diese Blattfeder 10 besitzt einen auf dem Jochende 2a aufliegenden Abschnitt 11, der als Lagerplatte dient und über das Jochende 2a vorsteht. Durch Freischneiden des Mittelteiles, der später noch erläutert wird, sind dabei zwei seitliche Plattenabschnitte 12 gebildet, die mit der Endkante 2b des Joches (FIG 2) eine etwa rechtwinkelige Lagerkerbe bilden, in welcher der Anker mit seiner spitzwinklig zugeschnittenen Lagerkante oder Lagerschneide 4b liegt. Durch den mittigen Freischnitt liegt der Anker nur auf verhältnismäßig kurzen Strecken der Plattenabschnitte 12 auf, so daß sich eine geringe Lagerreibung ergibt. Diese Auflagestrecke ist zusätzlich dadurch verringert, daß die Innenkanten 13 der Plattenabschnitte 12 vom Anker weg etwas aufgebogen sind, so daß keine scharfen Kanten am Anker anliegen. Außerdem besitzen die Plattenabschnitte 12 jeweils den Seitenkanten des Ankers gegenüberliegend aufgebogene Begrenzungslappen 14, an denen der Anker anstößt, wenn er etwa durch einen Stoß aus der Mitte bewegt werden sollte. An diesen Begrenzungslappen 14 stößt der Anker aber lediglich punktförmig im Bereich seiner Drehachse an, so daß hierdurch die Reibung nicht wesentlich vergrößert wird. Zusätzlich sind stirnseitige Begrenzungslappen 15 nach oben aufgebogen, welche den Anker auch bei Stößen in Richtung senkrecht zur Drehachse bzw. parallel zur Spulenachse auffangen.A leaf spring 10, which is now described in more detail with reference to FIGS. 2 to 5, is used for storing and resetting the armature. This leaf spring 10 has a section 11 resting on the yoke end 2a, which serves as a bearing plate and protrudes beyond the yoke end 2a. By cutting free the central part, which will be explained later, two side plate sections 12 are formed which, with the end edge 2b of the yoke (FIG. 2), form an approximately rectangular bearing notch, in which the armature with its bearing edge or cut to an acute angle Bearing edge 4b lies. Due to the central free cut, the anchor rests only on relatively short distances of the plate sections 12, so that there is little bearing friction. This contact distance is further reduced by the fact that the inner edges 13 of the plate sections 12 are slightly bent away from the anchor, so that no sharp edges lie against the anchor. In addition, the plate sections 12 each have boundary tabs 14 bent open opposite the side edges of the armature, against which the armature abuts when it should be moved from the center, for example by an impact. However, the armature only abuts these limiting tabs 14 in the area of its axis of rotation, so that the friction is not significantly increased. In addition, end-side limiting tabs 15 are bent upwards, which also catch the armature in the event of impacts in the direction perpendicular to the axis of rotation or parallel to the coil axis.

Da die Blattfeder auch zur Ankerrückstellung in seine Ruhelage dient, besitzt sie eine einstückig angeformte Rückstellfeder 16, welche bei Projektion in eine Ebene annähernd die Form eines Fragezeichens besitzt. Dabei ist ein zungenförmiger gerader Abschnitt 16a im Bereich der Lagerplatte mittig freigeschnitten, also zwischen den Plattenabschnitten 12, wodurch sich bereits eine langgestreckte weiche Feder ohne zusätzlichen Platzbedarf ergibt. Der annähernd ringförmige Abschnitt 16b der Rückstellfeder verläuft annähernd symmetrisch zur Mittelachse des Zungenabschnitts 16a, wobei die zum Anker hin zurückgeführte Spitze 16c nahezu wieder zur Mitte auf den zungenförmigen Abschnitt 16a hinzeigt. Der gesamte ringförmige Abschnitt 16b ist allerdings um das Ankerende herum abgebogen und erstreckt sich weitgehend parallel zur Ankeraußenseite, so daß die Feder keinen zusätzlichen Platz beansprucht, wenn man den ohnehin notwendigen Bewegungsspielraum für den Anker im Gehäuse in Betracht zieht.Since the leaf spring also serves to return the armature to its rest position, it has an integrally formed return spring 16, which approximately has the shape of a question mark when projected into a plane. A tongue-shaped straight section 16a is cut free in the center of the bearing plate, that is, between the plate sections 12, which results in an elongated soft spring without requiring additional space. The approximately ring-shaped section 16b of the return spring runs approximately symmetrically to the central axis of the tongue section 16a, the tip 16c, which is returned to the armature, pointing almost again towards the center towards the tongue-shaped section 16a. However, the entire annular portion 16b is bent around the armature end and extends largely parallel to the outside of the armature, so that the spring does not take up any additional space when one takes into account the already necessary freedom of movement for the armature in the housing.

Die Spitze 16c der Rückstellfeder greift in einen fensterförmigen Durchbruch 4c des Ankers ein und liegt auf einer Innenwand des Fensters derart auf, daß auf den Anker ein Rückstellmoment um die Lagerkante 4b herum ausgeübt wird. FIG 2 zeigt den Anker in abgefallenem Zustand mit ausgezogenen Linien, während die strichpunktierten Linien den Anker im angezogenen Zustand zeigen.The tip 16c of the return spring engages in a window-shaped opening 4c of the armature and lies on an inner wall of the window such that a restoring moment is exerted on the armature around the bearing edge 4b. 2 shows the anchor in the fallen-off state with solid lines, while the dash-dotted lines show the anchor in the drawn-in state.

Die Blattfeder ist mittels zweier seitlich angeformter Befestigungslappen 17 am Joch eingehängt, welche das Joch beiderseits umgreifen. Die Befestigungslappen 17 liegen dabei in Aussparungen 2c des Joches. Die Enden der Lappen 17 sind beiderseits verbreitert und bilden somit Rastnasen 18, mit denen die Befestigungslappen an den Kanten der Aussparungen 2c jeweils doppelseitig eingehängt sind. Durch diese doppelte Rastung ergibt sich eine sehr genaue und sichere Positionierung der Lagerplattenabschnitte 12 und der Rückstellfeder 16. Durch die abgewinkelten Enden 19 der Befestigungslappen ist ein leichtes Aufstecken bei der Montage auf das Joch ohne zusätzliche Spezialwerkzeuge ermöglicht.The leaf spring is hooked onto the yoke by means of two laterally formed fastening tabs 17 which grip around the yoke on both sides. The fastening tabs 17 lie in recesses 2c of the yoke. The ends of the tabs 17 are widened on both sides and thus form locking lugs 18 with which the fastening tabs are hooked onto the edges of the cutouts 2c on both sides. This double detent results in a very precise and secure positioning of the bearing plate sections 12 and the return spring 16. The angled ends 19 of the fastening tabs make it easy to attach them to the yoke without additional special tools.

Bei der Montage wird zunächst die Blattfeder 10 auf das Joch aufgesteckt (siehe FIG 2). Dann wird der Anker montiert, wobei der Federabschnitt 16b bzw. 16c zunächst zurückgebogen und dann in das Fenster 4c des Ankers eingesetzt wird. Es ist aber auch möglich, zunächst den Anker mit der Blattfeder zu verbinden und die vormontierte Baugruppe von Anker und Feder auf das Joch aufzustecken. Der Bogenabschnitt 16d, der zunächst aufgrund seiner Formgebung nach oben vorsteht (siehe FIG 2), wird nach dem Einsetzen des Ankers durch die Vorspannung nach unten gebogen (siehe 16d′ in FIG 2), so daß der Platzbedarf für die Feder weiter verringert wird.During assembly, the leaf spring 10 is first placed on the yoke (see FIG. 2). The anchor is then installed, the spring section 16b or 16c first being bent back and then inserted into the window 4c of the anchor. However, it is also possible to first connect the armature to the leaf spring and to fit the pre-assembled armature and spring assembly onto the yoke. The arc section 16d, which initially projects upwards due to its shape (see FIG. 2), is bent downward after the insertion of the armature by the prestress (see 16d ′ in FIG. 2), so that the space required for the spring is further reduced.

Claims (8)

  1. Electromagnetic relay having a coil, core and yoke and having a flat armature (4) which is supported at a free end of the yoke (2), and having a leaf spring (10) for supporting and resetting the armature, with the following features:
    - the leaf spring (10) forms a bearing plate (11) which rests on an outer surface of the yoke (2) and projects beyond the end (2a) of the yoke in such a manner that a bearing notch for a bearing edge (4b) of the armature (4) is formed between the end surfaces of the yoke and of the bearing plate (10);
    - a resetting spring (16) is integrally formed on the bearing plate (11), which resetting spring (16) engages around the bearing edge of the armature (4) and engages by means of a section (16c), which extends in the opposite direction to the bearing plate, into a recess (4c) in the armature,
    characterised by the following additional features:
    - the resetting spring (16) has a first section (16a) which is cut free in the form of a straight spring tongue from the central region of the bearing plate (11) and divides the bearing plate into two plate sections (12) on which the armature (4) rests only with side regions of its bearing edge (4b); and
    - the resetting spring (16) has a second section (16b), which is bent towards the armature (4), is cut in a U-shape in the bent leaf-spring plane and extends with an approximately identical shape on both sides of a plane of symmetry which intersects the spring tongue (16a).
  2. Relay according to Claim 1, characterised in that the arc-shaped section (16b) of the resetting spring (16) is arranged with its leaf-spring plane essentially parallel to the armature.
  3. Relay according to Claim 1 or 2, characterised in that the edges (13) of the plate sections (12) facing the spring tongue (16a) are bent away through a small angle from the armature (4).
  4. Relay according to one of Claims 1 to 3, characterised in that attachment flaps (17) which are integrally formed on both sides on the bearing plate (11) engage around the yoke (2), each attachment flap (17) being guided in a recess (2c) in the yoke and being suspended at the free end, in each case at both corners, by means of in each case one latching tab (18) on the edge of the recess (2c).
  5. Relay according to one of Claims 1 to 4, characterised in that the recess in the armature (4) is constructed as a continuous window (4c), the tip (16c) of the resetting spring (16) resting on an inner wall of the window.
  6. Relay according to one of Claims 1 to 5, characterised in that boundary flaps (14) are provided, which are bent up on the longitudinal sides of the plate sections (12) on both sides of the armature (4).
  7. Relay according to one of Claims 1 to 6, characterised in that boundary flaps (15) at the ends are provided on the ends of the plate sections (12), for the armature.
  8. Relay according to one of Claims 1 to 7, characterised in that the leaf spring (10) comprises highly magnetically conductive steel, preferably chrome-nickel steel.
EP88121581A 1988-12-23 1988-12-23 Electromagnetic relay Expired - Lifetime EP0374304B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE8888121581T DE3882049D1 (en) 1988-12-23 1988-12-23 ELECTROMAGNETIC RELAY.
EP88121581A EP0374304B1 (en) 1988-12-23 1988-12-23 Electromagnetic relay
ES198888121581T ES2040826T3 (en) 1988-12-23 1988-12-23 ELECTROMAGNETIC RELAY.
AT88121581T ATE91041T1 (en) 1988-12-23 1988-12-23 ELECTROMAGNETIC RELAY.
JP1324132A JPH02226632A (en) 1988-12-23 1989-12-15 Solenoid relay
US07/649,266 US5065127A (en) 1988-12-23 1991-01-30 Leaf spring for an electromagnetic relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88121581A EP0374304B1 (en) 1988-12-23 1988-12-23 Electromagnetic relay

Publications (2)

Publication Number Publication Date
EP0374304A1 EP0374304A1 (en) 1990-06-27
EP0374304B1 true EP0374304B1 (en) 1993-06-23

Family

ID=8199715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121581A Expired - Lifetime EP0374304B1 (en) 1988-12-23 1988-12-23 Electromagnetic relay

Country Status (6)

Country Link
US (1) US5065127A (en)
EP (1) EP0374304B1 (en)
JP (1) JPH02226632A (en)
AT (1) ATE91041T1 (en)
DE (1) DE3882049D1 (en)
ES (1) ES2040826T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5260677A (en) * 1991-11-04 1993-11-09 Gamble John G Snap-acting normally closed AC relay
DE19544625C2 (en) * 1995-11-30 2001-05-31 Hella Kg Hueck & Co Armature bearing for a hinged armature relay
US5982257A (en) * 1996-10-31 1999-11-09 Siemens Electromechanical Components, Inc. Integral armature retention spring for electromagnetic relays
ES2240617T3 (en) * 2001-08-10 2005-10-16 Tyco Electronics Amp Gmbh SWITCH RELAY WITH IMPROVED ARMOR SPRING.
DE102012202084A1 (en) * 2012-02-13 2013-08-14 Siemens Aktiengesellschaft Hinged armature bearing for magnetic release

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1094366B (en) * 1958-03-06 1960-12-08 Asea Ab Armature bearing in an electromagnetic relay
DE7033403U (en) * 1970-09-08 1970-12-17 Kienzle Uhrenfabriken Gmbh RETURN SPRING FOR FOLDING ANCHORS.
DE3120117C2 (en) * 1981-05-20 1984-10-31 Siemens AG, 1000 Berlin und 8000 München Magnet system for a relay
US4670727A (en) * 1985-07-18 1987-06-02 Siemens Aktiengesellschaft Electromagnetic relay
DE3675852D1 (en) * 1985-08-09 1991-01-10 Siemens Ag ELECTROMAGNETIC RELAY.
US4818965A (en) * 1986-06-23 1989-04-04 Siemens Aktiengesellschaft Electromagnetic relay

Also Published As

Publication number Publication date
US5065127A (en) 1991-11-12
JPH02226632A (en) 1990-09-10
DE3882049D1 (en) 1993-07-29
ATE91041T1 (en) 1993-07-15
ES2040826T3 (en) 1993-11-01
EP0374304A1 (en) 1990-06-27

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