EP2858180A1 - Electrical contact element for a plug-in connection with a circuit board - Google Patents

Electrical contact element for a plug-in connection with a circuit board Download PDF

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Publication number
EP2858180A1
EP2858180A1 EP14003404.2A EP14003404A EP2858180A1 EP 2858180 A1 EP2858180 A1 EP 2858180A1 EP 14003404 A EP14003404 A EP 14003404A EP 2858180 A1 EP2858180 A1 EP 2858180A1
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EP
European Patent Office
Prior art keywords
spring legs
contact element
contact
spring
bore
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EP14003404.2A
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German (de)
French (fr)
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EP2858180B1 (en
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Uberto Gamaggio
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/51—Fixed connections for rigid printed circuits or like structures
    • H01R12/55—Fixed connections for rigid printed circuits or like structures characterised by the terminals
    • H01R12/58—Fixed connections for rigid printed circuits or like structures characterised by the terminals terminals for insertion into holes
    • H01R12/585—Terminals having a press fit or a compliant portion and a shank passing through a hole in the printed circuit board

Definitions

  • the invention relates to a contact element for producing a plug connection with a bore having an inner wall, in particular for connection to a printed circuit board, wherein the contact element is designed as a contact post with a spring element integrally attached thereto, which has two mutually parallel spring legs.
  • Such a contact element which has an elastic deformable plane, which makes it suitable for insertion through a through hole in a printed circuit board.
  • the elastically deformable surface comprises two mutually parallel spring legs, which are interconnected by a deformable bridge. This is intended to ensure that the spring legs rest against the inner wall of the bore of the circuit board.
  • the deformable bridge comprises in cross-section a flat portion which extends at right angles to the two opposite spring legs and has an upper and a lower surface. From the opposite ends of the upper surface extend outwardly two oblique areas adjacent to the spring legs.
  • this object is achieved in a contact element of the type mentioned above in that the spring legs in a first axis forming plug-in direction are separated by a over its entire length the same width gap having, wherein the spring legs have transversely to the insertion direction and transverse to the opening formed by the slot in a first axis a convexly curved outer contour, and that the spring legs during a plugging operation in the bore in a direction transverse to the plug-in direction deformable and partially rotatable.
  • the width of the spring leg is dimensioned so that when inserting the contact element into a hole in a circuit board, the spring legs through the wall of the bore, d. H. in the spring area of the spring legs, be compressed and compress.
  • the diameter of the bore is so narrow in at least one region in a spring plane, that the existing of an electrically conductive material contact element can only be resiliently inserted at rest with its spring element, wherein the spring legs inward, d. H. to the gap between them, spring down.
  • Such a Kaltlötharm has a good electrical conductivity and a good thermal conductivity.
  • a good electrical connection is made with the inner wall of the bore, wherein the Torsional movement of the spring leg at least in its last phase represents a rolling motion on the inner wall of the bore.
  • the wall of the bore preferably remains rigid and undamaged. This can create a very advantageous electrical connector between the contact element and the circuit board.
  • the spring legs which spring in the gap formed between them, a very precisely metered spring force and a precisely predetermined spring travel are achieved.
  • the resilient mounting within the bore ensures high contact forces and a permanently good contact. Due to the fact that the spring forces continue to act in the mated connection once produced in the bore, the good contact properties are also of long service life even in the case of adverse environmental influences.
  • a particular advantage of the invention is that the outer contours or individual areas of the outer contours of the spring legs completely or at least over a wide circumference cling tightly to the inner contour of the bore and form a cold soldering with the inner contour, so that the spring legs gas-tight on the inner contour abut and gas-tight contact zones with the wall of the bore form. This prevents the penetration of oxygen and moisture into these areas so that corrosion does not occur. Only the fact that these areas remain corrosion-free, the required electrical conductivity is permanently ensured.
  • the contact element is preferably made of a copper alloy, in particular of a copper wrought alloy. Especially spring materials are suitable. .
  • the spring legs in the first axis in Toward each other have a trough-shaped depression. Through the trough-shaped depression divided by the gap it is achieved that the spring legs have a high degree of elasticity and, when they are inserted into the bore of the printed circuit board, form a large contact outer area with the bore of the printed circuit board. This assists in the production of a fixed connection to the wall of the bore to the printed circuit board by a cold solder joint.
  • the recess of the spring legs forms a cross-sectionally substantially trapezoidal recess.
  • the spring legs in cross-section transversely to the direction of the first axis each have quadrangular contours with rounded corners.
  • spring legs in cross-section in each case to a second and a third axis diagonal direction on the sides facing away from each other, d. H. at the outer edges, each having a trough-shaped recess.
  • the fact that the spring legs are rounded in each case with advantage at their insertion-side tips in the insertion direction, they can be easily inserted into the bore of a circuit board. It allows a gentle introduction into the circuit board, so that it is spared. As a result, the tracks on the circuit board and surrounding components are little burdened. A buckling of the press-in zone of the circuit board is avoided.
  • the contact element according to the invention has a high elastic deformation proportion, which is higher than that of contact elements according to the prior art.
  • the gap protrudes counter to the insertion direction over the length of the trough in the direction of the contact post. Also by this measure, the elasticity of the spring legs is supported.
  • the legs in the first direction approximately in the middle of their length each have a wider contour which tapers toward both the contact post and its tips.
  • the trough formed between the legs extends in the first direction, i. H. in the plug-in direction, flatter in the direction of the contact post and also flat in the direction of the tips of the legs, so there rises slightly.
  • a galvanic coating is preferably used.
  • a particularly low insertion force is ensured in the circuit board and formed by the torsional force of the individual legs an optimal contacting surface for printed circuit board hole.
  • the open tips of the spring legs allow a flat spring characteristic with a particularly gentle and low insertion force when introduced into a bore.
  • the contacting made possible according to the invention is based on a flexible press-in zone, as formed by the two spring legs.
  • the contact element provided according to the invention has a reduced scattering of the spring force.
  • the shape of the spring legs results in a uniform distribution of the Hertzian stresses and the deformations in the contact zones; in particular, these are much smaller than contact elements according to the prior art.
  • good self-concentration in the press-in zone is achieved by the selected shape of the spring leg with the trough-shaped recess.
  • the shape of the spring leg also ensures that a large conductor cross-section is present with a large deformation path. This results in a high current carrying capacity with low current heating.
  • the contact element has a compact design that supports miniaturization.
  • a contact element 1 ( Fig. 1 to 6 ) comprises at its upper end a contact post 2, which in turn carries at its lower end two integrally connected with the contact post 2 and separated by a narrow gap 3 spring legs 4, 5.
  • the gap 3 extends in the direction of a Axis A and preferably has the same width over its entire length; the gap 3 is formed during punching by a shearing process.
  • the spring legs 4, 5 have on their outer sides in each case convexly curved outer contours 6, 7.
  • the spring legs have an axisymmetric, the gap 3 cross trough-shaped recess or trough 8, which extends substantially over the entire length of the spring leg 4, 5 or the length of the gap 3, but also a greater or lesser length than the gap 3 can have.
  • the spring legs 4, 5 At their tips 16 and 17, the spring legs 4, 5 each have a rounding.
  • the recess 8 forms in cross section ( Fig. 2 ), ie transverse to the direction of the axis A, a substantially trapezoidal recess 9. Laterally of the recess form the spring legs 4, 5 each quadrangular contours 10, 11 and 12, 13, each having rounded corners. In a diagonal direction relative to an axis B and an axis C, a depression 14 is present between the quadrangular contours 10 and 12, and a depression 15 is provided between the contours 11 and 13.
  • the trough 8 flattens off both in the direction of the contact post 2 and in the direction of the tips 16, 17.
  • contours 12, 13 are finally a large area on the inner wall of the bore 21 and make a wide contact zone with the bore 21 ago, so that excellent electrical conductivity and thermal conductivity during the transition from the spring legs 4, 5 are generated to the bore 21.

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  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

Ein Kontaktelement (1) zur Herstellung einer Steckverbindung mit einer eine innere Wandung aufweisenden Bohrung (21), ist dadurch gekennzeichnet, dass die Federschenkel (4, 5) in einer eine erste Achse (A) bildenden Steckrichtung durch einen über seine gesamte Länge die gleiche Breite aufweisenden Spalt (3) voneinander getrennt sind, wobei die Federschenkel (4, 5) quer zur Steckrichtung und quer zu der von dem Schlitz gebildeten Öffnung eine konvex gebogene äußere Kontur (6, 7) haben, und dass die Federschenkel (4, 5) während eines Steckvorgangs in der Bohrung (21) in einer zur Steckrichtung transversalen Ebene verformbar sind. Hierbei ist das Kontaktelement (1) als Kontaktpfosten (2) mit einem einstückig daran angebrachten Federelement ausgebildet, welches zwei zueinander parallele Federschenkel (4, 5) aufweist.

Figure imgaf001
A contact element (1) for producing a plug connection with a bore (21) having an inner wall, is characterized in that the spring legs (4, 5) in a plug-in direction forming a first axis (A) by a the same over its entire length Width having gap (3) are separated from each other, wherein the spring legs (4, 5) transversely to the insertion direction and transverse to the opening formed by the slot have a convexly curved outer contour (6, 7), and that the spring legs (4, 5 ) are deformable during a plugging operation in the bore (21) in a plane transverse to the plugging direction. Here, the contact element (1) as a contact post (2) is formed with a spring element integrally attached thereto, which has two mutually parallel spring legs (4, 5).
Figure imgaf001

Description

Die Erfindung bezieht sich auf ein Kontaktelement zur Herstellung einer Steckverbindung mit einer eine innere Wandung aufweisenden Bohrung, insbesondere zur Verbindung mit einer Leiterplatte, wobei das Kontaktelement als Kontaktpfosten mit einem einstückig daran angebrachten Federelement ausgebildet ist, welches zwei zueinander parallele Federschenkel aufweist.The invention relates to a contact element for producing a plug connection with a bore having an inner wall, in particular for connection to a printed circuit board, wherein the contact element is designed as a contact post with a spring element integrally attached thereto, which has two mutually parallel spring legs.

Aus EP 0 831 558 A2 ist ein derartiges Kontaktelement bekannt, das eine elastische verformbare Ebene aufweist, die es zum Durchstecken durch eine durchgehende Bohrung in einer Leiterplatte geeignet macht. Dabei umfasst die elastisch verformbare Fläche zwei zueinander parallele Federschenkel, die durch eine verformbare Brücke miteinander verbunden sind. Dadurch soll erreicht werden, dass die Federschenkel an der inneren Wandung der Bohrung der Leiterplatte anliegen. Die verformbare Brücke umfasst im Querschnitt einen flachen Bereich, der sich im rechten Winkel zu den beiden gegenüberliegenden Federschenkeln erstreckt und eine obere und eine untere Oberfläche aufweist. Von den einander gegenüberliegenden Enden der oberen Oberfläche erstrecken sich nach außen zwei schräge Bereiche, die an die Federschenkel angrenzen.Out EP 0 831 558 A2 Such a contact element is known, which has an elastic deformable plane, which makes it suitable for insertion through a through hole in a printed circuit board. In this case, the elastically deformable surface comprises two mutually parallel spring legs, which are interconnected by a deformable bridge. This is intended to ensure that the spring legs rest against the inner wall of the bore of the circuit board. The deformable bridge comprises in cross-section a flat portion which extends at right angles to the two opposite spring legs and has an upper and a lower surface. From the opposite ends of the upper surface extend outwardly two oblique areas adjacent to the spring legs.

Bei elektrischen Steckverbindungen besteht die Anforderung, eine sichere elektrische Kontaktierung auch unter widrigen Umgebungseinflüssen wie Temperaturschwankungen, mechanischen Vibrationen und dgl., zu gewährleisten. Insbesondere für den Einsatz an Bord eines Fahrzeugs muss die Kontaktsicherheit auch unter derartigen Einflüssen für die gesamte Lebensdauer erhalten werden.In electrical connectors there is a requirement to ensure a secure electrical contact even under adverse environmental influences such as temperature fluctuations, mechanical vibrations and the like .. In particular, for use on board a vehicle, the contact reliability must be maintained even under such influences for the entire life.

Es ist die Aufgabe der Erfindung, ein Kontaktelement zu schaffen, das gute Kontakteigenschaften hat und gleichzeitig kostengünstig herzustellen ist.It is the object of the invention to provide a contact element which has good contact properties and at the same time is inexpensive to manufacture.

Gemäß der Erfindung wird diese Aufgabe bei einem Kontaktelement der eingangs genannten Art dadurch gelöst, dass die Federschenkel in einer eine erste Achse bildenden Steckrichtung durch einen über seine gesamte Länge die gleiche Breite aufweisenden Spalt voneinander getrennt sind, wobei die Federschenkel quer zur Steckrichtung und quer zu der von dem Schlitz gebildeten Öffnung in einer ersten Achse eine konvex gebogene äußere Kontur haben, und dass die Federschenkel während eines Steckvorgangs in der Bohrung in einer zur Steckrichtung transversalen Ebene verformbar und teilweise verdrehbar sind.According to the invention, this object is achieved in a contact element of the type mentioned above in that the spring legs in a first axis forming plug-in direction are separated by a over its entire length the same width gap having, wherein the spring legs have transversely to the insertion direction and transverse to the opening formed by the slot in a first axis a convexly curved outer contour, and that the spring legs during a plugging operation in the bore in a direction transverse to the plug-in direction deformable and partially rotatable.

Die Breite der Federschenkel ist so bemessen, dass beim Einstecken des Kontaktelements in eine Bohrung einer Leiterplatte die Federschenkel durch die Wandung der Bohrung, d. h. im Federbereich der Federschenkel, zusammengedrückt werden und einfedern. Der Durchmesser der Bohrung ist also in mindestens einem Bereich in einer Federebene so schmal, dass das aus einem elektrisch leitfähigen Material bestehende Kontaktelement im Ruhezustand mit seinem Federelement nur federnd eingesteckt werden kann, wobei die Federschenkel nach innen, d. h. zu dem Spalt zwischen ihnen, einfedern.The width of the spring leg is dimensioned so that when inserting the contact element into a hole in a circuit board, the spring legs through the wall of the bore, d. H. in the spring area of the spring legs, be compressed and compress. The diameter of the bore is so narrow in at least one region in a spring plane, that the existing of an electrically conductive material contact element can only be resiliently inserted at rest with its spring element, wherein the spring legs inward, d. H. to the gap between them, spring down.

Bei diesem Einfederungsvorgang vollzieht sich gleichzeitig eine Drehbewegung der Federschenkel in einer zur Steckrichtung transversalen Schnittebene im Bereich der Bohrung. Bei dieser Drehbewegung werden die Federschenkel durch die Innenwandung der Bohrung geführt und in Richtung zum Mittelpunkt der Bohrung verbogen. Auf diese Weise wird eine vollständig oder wenigstens im Wesentlichen reversible elastische Drehung der Federschenkel ausgeführt, die nach Beendigung des Steckvorgangs zu einem guten und breite Flächenbereiche der äußeren Konturen der Federschenkel umfassenden Anliegen der Federschenkel an der Innenwandung der Bohrung führt. Dies hat die Entstehung breiter gasdicht an der Innenwandung anliegender Zonen der Federschenkel zur Folge, wobei über einen Zeitraum von bis zu 24 Stunden eine Kaltlötverbindung zwischen dem Federschenkel und dem Bereich aus der Innenwandung der Bohrung entsteht. Eine solche Kaltlötverbindung weist eine gute elektrische Leitfähigkeit und eine gute Temperaturleitfähigkeit auf. Durch den Einsatz der Dreh- oder Torsionsbewegung der Federschenkel in der Bohrung wird eine gute elektrische Verbindung mit der Innenwand der Bohrung hergestellt, wobei die Torsionsbewegung der Federschenkel wenigstens in ihrer letzten Phase eine Abrollbewegung auf der Innenwandung der Bohrung darstellt.In this compression process takes place at the same time a rotational movement of the spring legs in a direction transverse to the insertion direction cutting plane in the bore. During this rotational movement, the spring legs are guided through the inner wall of the bore and bent in the direction of the center of the bore. In this way, a completely or at least substantially reversible elastic rotation of the spring legs is performed, which leads to a good and wide surface areas of the outer contours of the spring leg comprehensive concerns the spring leg on the inner wall of the bore after completion of the plug-in operation. This has the emergence of broad gas-tight on the inner wall adjacent zones of the spring leg result, over a period of up to 24 hours a Kaltlötverbindung between the spring leg and the region of the inner wall of the bore is formed. Such a Kaltlötverbindung has a good electrical conductivity and a good thermal conductivity. Through the use of the rotational or torsional movement of the spring legs in the bore, a good electrical connection is made with the inner wall of the bore, wherein the Torsional movement of the spring leg at least in its last phase represents a rolling motion on the inner wall of the bore.

Während des Einsteckens des Kontaktelements bleibt die Wandung der Bohrung bevorzugt starr und unbeschädigt. Damit lässt sich zwischen dem Kontaktelement und der Leiterplatte eine sehr vorteilhafte elektrische Steckverbindung schaffen. Mit den Federschenkeln, die in dem zwischen ihnen gebildeten Spalt einfedern, werden eine sehr genau dosierte Federkraft und ein exakt vorgegebener Federweg erzielt. Die federnde Aufnahme innerhalb der Bohrung sorgt für hohe Kontaktkräfte und eine dauerhaft gute Kontaktierung. Dadurch, dass die Federkräfte auch in der in der Bohrung einmal hergestellten zusammengesteckten Verbindung weiterwirken, sind die guten Kontakteigenschaften auch bei widrigen Umwelteinflüssen von langer Lebensdauer.During insertion of the contact element, the wall of the bore preferably remains rigid and undamaged. This can create a very advantageous electrical connector between the contact element and the circuit board. With the spring legs, which spring in the gap formed between them, a very precisely metered spring force and a precisely predetermined spring travel are achieved. The resilient mounting within the bore ensures high contact forces and a permanently good contact. Due to the fact that the spring forces continue to act in the mated connection once produced in the bore, the good contact properties are also of long service life even in the case of adverse environmental influences.

Ein besonderer Vorteil der Erfindung besteht darin, dass die Außenkonturen oder einzelne Bereiche der Außenkonturen der Federschenkel sich ganz oder wenigstens über einen weiten Umfang fest an die Innenkontur der Bohrung anschmiegen und eine kalte Verlötung mit der Innenkontur bilden, so dass die Federschenkel gasdicht an der Innenkontur anliegen und gasdichte Kontaktzonen mit der Wandung der Bohrung ausbilden. Dadurch wird das Eindringen von Sauerstoff und Feuchtigkeit in diese Bereiche verhindert, so dass es nicht zur Korrosion kommt. Nur dadurch, dass diese Bereiche korrosionsfrei bleiben, wird dauerhaft die erforderliche elektrische Leitfähigkeit gewährleistet.A particular advantage of the invention is that the outer contours or individual areas of the outer contours of the spring legs completely or at least over a wide circumference cling tightly to the inner contour of the bore and form a cold soldering with the inner contour, so that the spring legs gas-tight on the inner contour abut and gas-tight contact zones with the wall of the bore form. This prevents the penetration of oxygen and moisture into these areas so that corrosion does not occur. Only the fact that these areas remain corrosion-free, the required electrical conductivity is permanently ensured.

Das Kontaktelement wird bevorzugt aus einer Kupferlegierung hergestellt, insbesondere aus einer Kupferknetlegierung. Ganz besonders sind Federwerkstoffe geeignet. ,The contact element is preferably made of a copper alloy, in particular of a copper wrought alloy. Especially spring materials are suitable. .

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen, der Beschreibung und den Zeichnungen.Advantageous developments of the invention will become apparent from the dependent claims, the description and the drawings.

Vorzugsweise ist vorgesehen, dass die Federschenkel in der ersten Achse in Richtung zueinander eine muldenförmige Vertiefung aufweisen. Durch die durch den Spalt geteilte muldenförmige Vertiefung wird erreicht, dass die Federschenkel, eine große Elastizität haben und, wenn sie in die Bohrung der Leiterplatte hineingesteckt sind, einen großen Kontaktaußenbereich mit der Bohrung der Leiterplatte bilden. Dies unterstützt die Herstellung einer fest an der Wandung der Bohrung anliegenden Verbindung mit der Leiterplatte durch eine Kaltlötverbindung.It is preferably provided that the spring legs in the first axis in Toward each other have a trough-shaped depression. Through the trough-shaped depression divided by the gap it is achieved that the spring legs have a high degree of elasticity and, when they are inserted into the bore of the printed circuit board, form a large contact outer area with the bore of the printed circuit board. This assists in the production of a fixed connection to the wall of the bore to the printed circuit board by a cold solder joint.

In einer weiteren vorteilhaften Ausgestaltung ist vorgesehen, dass die Vertiefung der Federschenkel eine im Querschnitt im Wesentlichen trapezförmige Ausnehmung bildet.In a further advantageous embodiment, it is provided that the recess of the spring legs forms a cross-sectionally substantially trapezoidal recess.

Vorteilhaft ist es auch, wenn die Federschenkel im Querschnitt quer zur Richtung der ersten Achse jeweils viereckförmige Konturen mit verrundeten Ecken aufweisen.It is also advantageous if the spring legs in cross-section transversely to the direction of the first axis each have quadrangular contours with rounded corners.

Ebenso ist von Vorteil, wenn die Federschenkel im Querschnitt in zu einer zweiten und einer dritten Achse jeweils diagonalen Richtung an den voneinander abgewandten Seiten, d. h. an den Außenkanten, jeweils eine muldenförmige Ausnehmung aufweisen.It is also advantageous if the spring legs in cross-section in each case to a second and a third axis diagonal direction on the sides facing away from each other, d. H. at the outer edges, each having a trough-shaped recess.

Dadurch, dass die Federschenkel mit Vorteil an ihren einsteckseitigen Spitzen in Einsteckrichtung jeweils verrundet sind, lassen sie sich leicht in die Bohrung einer Leiterplatte einführen. Es wird eine sanfte Einführung in die Leiterplatte ermöglicht, so dass diese geschont wird. Hierdurch werden die Leiterbahnen auf der Leiterplatte und umliegende Bauteile wenig belastet. Ein Einknicken der Einpresszone der Leiterplatte wird vermieden. Das erfindungsgemäße Kontaktelement hat einen hohen elastischen Deformationsanteil, der höher ist als der von Kontaktelementen nach dem Stand der Technik.The fact that the spring legs are rounded in each case with advantage at their insertion-side tips in the insertion direction, they can be easily inserted into the bore of a circuit board. It allows a gentle introduction into the circuit board, so that it is spared. As a result, the tracks on the circuit board and surrounding components are little burdened. A buckling of the press-in zone of the circuit board is avoided. The contact element according to the invention has a high elastic deformation proportion, which is higher than that of contact elements according to the prior art.

Vorzugsweise wird vorgesehen, dass der Spalt entgegen der Einsteckrichtung über die Länge der Mulde in Richtung zu dem Kontaktpfosten hinausragt. Auch durch diese Maßnahme wird die Elastizität der Federschenkel unterstützt.It is preferably provided that the gap protrudes counter to the insertion direction over the length of the trough in the direction of the contact post. Also By this measure, the elasticity of the spring legs is supported.

In vorteilhafter Weise haben die Schenkel in der ersten Richtung in etwa in der Mitte ihrer Länge jeweils eine breitere Kontur, die sich sowohl in Richtung zu dem Kontaktpfosten als auch zu ihren Spitzen hin jeweils verjüngt.Advantageously, the legs in the first direction approximately in the middle of their length each have a wider contour which tapers toward both the contact post and its tips.

Vorzugsweise verläuft die zwischen den Schenkeln gebildete Mulde in der ersten Richtung, d. h. in der Steckrichtung, in Richtung zu dem Kontaktpfosten flacher und in Richtung zu den Spitzen der Schenkel ebenfalls flacher, steigt dort also leicht an.Preferably, the trough formed between the legs extends in the first direction, i. H. in the plug-in direction, flatter in the direction of the contact post and also flat in the direction of the tips of the legs, so there rises slightly.

Zur Herstellung einer guten und dauerhaften Leitfähigkeit wird vorzugsweise eine galvanische Beschichtung verwendet. Dadurch wird eine besonders niedrige Einpresskraft in die Leiterplatte gewährleistet und durch die Torsionskraft der einzelnen Schenkel eine optimale Kontaktierungsoberfläche zur Leiterplattenbohrung gebildet. Die offenen Spitzen der Federschenkel ermöglichen eine flache Federkennlinie mit einer besonders sanften und niedrigen Einpresskraft beim Einbringen in eine Bohrung.To produce a good and permanent conductivity, a galvanic coating is preferably used. As a result, a particularly low insertion force is ensured in the circuit board and formed by the torsional force of the individual legs an optimal contacting surface for printed circuit board hole. The open tips of the spring legs allow a flat spring characteristic with a particularly gentle and low insertion force when introduced into a bore.

Die gemäß der Erfindung ermöglichte Kontaktierung basiert auf einer flexiblen Einpresszone, wie sie durch die beiden Federschenkel gebildet wird. Gegenüber herkömmlichen Kontaktelementen weist das erfindungsgemäß vorgesehene Kontaktelement eine verringerte Streuung der Federkraft auf. Durch die Form der Federschenkel kommt es zu einer gleichmäßigen Verteilung der Hertzschen Pressungen und der Deformationen in den Kontaktzonen; insbesondere sind diese gegenüber Kontaktelementen nach dem Stand der Technik viel geringer. Es kommt nur zu einer minimalen Verformung der metallischen Durchkontaktierung in der Leiterplattenbohrung, so dass sich das Kontaktelement auch für dünne Leiterplatten eignet. Ebenso wird durch die gewählte Form der Federschenkel mit der muldenförmigen Ausnehmung eine gute Selbstkonzentrierung in der Einpresszone erreicht.The contacting made possible according to the invention is based on a flexible press-in zone, as formed by the two spring legs. Compared to conventional contact elements, the contact element provided according to the invention has a reduced scattering of the spring force. The shape of the spring legs results in a uniform distribution of the Hertzian stresses and the deformations in the contact zones; in particular, these are much smaller than contact elements according to the prior art. There is only a minimal deformation of the metallic via in the PCB bore, so that the contact element is also suitable for thin circuit boards. Likewise, good self-concentration in the press-in zone is achieved by the selected shape of the spring leg with the trough-shaped recess.

Ebenso sorgt die Form der Federschenkel auch dafür, dass ein großer Leiterquerschnitt bei gleichzeitig großem Deformationsweg vorhanden ist. Dadurch ergibt sich eine hohe Stromtragfähigkeit bei geringer Stromerwärmung. Das Kontaktelement hat eine kompakte Bauweise, die die Miniaturisierung unterstützt.Likewise, the shape of the spring leg also ensures that a large conductor cross-section is present with a large deformation path. This results in a high current carrying capacity with low current heating. The contact element has a compact design that supports miniaturization.

Nachstehend wird die Erfindung anhand eines Ausführungsbeispiels näher erläutert. Es zeigen:

Fig. 1
eine Draufsicht auf ein Kontaktelement,
Fig. 2
eine Schnittansicht des Kontaktelements gemäß Fig. 1 entlang einer Schnittlinie I - I aus Fig. 1,
Fig. 3
eine Seitenansicht des Kontaktelements,
Fig. 4
eine perspektivische Ansicht der Vorderseite des Kontaktelements,
Fig. 5
eine Ansicht von der vorderen Spitze her,
Fig. 6
eine perspektivische Ansicht der Rückseite des Kontaktelements,
Fig. 7
eine Schnittansicht eines Ausschnitts des Kontaktelements, das in einer Spannvorrichtung eingespannt ist,
Fig. 8a - 8c
perspektivische Ansichten eines Ausschnitts eines mit seinen Federschenkeln in eine Bohrung einer Leiterplatte eingesteckten Kontaktelements von der Rückseite, wobei die Federschenkel in den verschiedenen Steckpositionen die Bohrung der Leiterplatte durchragen, und
Fig. 9a - 9c
zu den perspektivischen Ansichten gemäß Fig. 8a bis 8c zugehörige Schnittansichten, jeweils gemäß einer zugehörigen Schnittlinie VIIIa - VIIIa, VIIIb - VIIIb bzw. VIIIc - VIIIc des Kontaktelements entsprechend den Steckpositionen in der Leiterplatte.
The invention will be explained in more detail with reference to an embodiment. Show it:
Fig. 1
a plan view of a contact element,
Fig. 2
a sectional view of the contact element according to Fig. 1 along a section line I - I out Fig. 1 .
Fig. 3
a side view of the contact element,
Fig. 4
a perspective view of the front of the contact element,
Fig. 5
a view from the front tip,
Fig. 6
a perspective view of the back of the contact element,
Fig. 7
FIG. 3 a sectional view of a section of the contact element which is clamped in a tensioning device, FIG.
Fig. 8a - 8c
perspective views of a section of a plugged with his spring legs in a hole in a printed circuit board contact element from the back, wherein the spring legs in the various plug positions, the bore of the circuit board protrude, and
Fig. 9a - 9c
according to the perspective views Fig. 8a to 8c corresponding sectional views, in each case according to an associated section line VIIIa - VIIIa, VIIIb - VIIIb or VIIIc - VIIIc of the contact element corresponding to the plug positions in the circuit board.

Ein Kontaktelement 1 (Fig. 1 bis 6) umfasst an seinem oberen Ende einen Kontaktpfosten 2, der seinerseits an seinem unteren Ende zwei einstückig mit dem Kontaktpfosten 2 verbundene und durch einen schmalen Spalt 3 voneinander getrennte Federschenkel 4, 5 trägt. Der Spalt 3 erstreckt sich in Richtung einer Achse A und hat über seine ganze Länge vorzugsweise dieselbe Breite; der Spalt 3 entsteht beim Stanzen durch einen Scherprozess.A contact element 1 ( Fig. 1 to 6 ) comprises at its upper end a contact post 2, which in turn carries at its lower end two integrally connected with the contact post 2 and separated by a narrow gap 3 spring legs 4, 5. The gap 3 extends in the direction of a Axis A and preferably has the same width over its entire length; the gap 3 is formed during punching by a shearing process.

Die Federschenkel 4, 5 weisen an ihren Außenseiten jeweils konvex gebogene äußere Konturen 6, 7 auf. Außerdem weisen die Federschenkel eine achssymmetrische, den Spalt 3 übergreifende muldenförmige Ausnehmung oder Mulde 8 auf, die sich im Wesentlichen über die gesamte Länge der Federschenkel 4, 5 oder die Länge des Spalts 3 erstreckt, die aber auch eine größere oder geringere Länge als der Spalt 3 haben kann. An ihren Spitzen 16 bzw. 17 weisen die Federschenkel 4, 5 jeweils eine Verrundung auf.The spring legs 4, 5 have on their outer sides in each case convexly curved outer contours 6, 7. In addition, the spring legs have an axisymmetric, the gap 3 cross trough-shaped recess or trough 8, which extends substantially over the entire length of the spring leg 4, 5 or the length of the gap 3, but also a greater or lesser length than the gap 3 can have. At their tips 16 and 17, the spring legs 4, 5 each have a rounding.

Die Vertiefung 8 bildet im Querschnitt (Fig. 2), d. h. quer zur Richtung der Achse A, eine im Wesentlichen trapezförmige Ausnehmung 9. Seitlich der Ausnehmung bilden die Federschenkel 4, 5 jeweils viereckförmige Konturen 10, 11 und 12, 13, die jeweils verrundete Ecken aufweisen. In einer zu einer Achse B und einer Achse C diagonalen Richtung ist zwischen den viereckförmigen Konturen 10 und 12 eine Mulde 14 und zwischen den Konturen 11 und 13 eine Mulde 15 vorhanden.The recess 8 forms in cross section ( Fig. 2 ), ie transverse to the direction of the axis A, a substantially trapezoidal recess 9. Laterally of the recess form the spring legs 4, 5 each quadrangular contours 10, 11 and 12, 13, each having rounded corners. In a diagonal direction relative to an axis B and an axis C, a depression 14 is present between the quadrangular contours 10 and 12, and a depression 15 is provided between the contours 11 and 13.

Die Mulde 8 flacht sich sowohl in Richtung zu dem Kontaktpfosten 2 als auch in Richtung zu den Spitzen 16, 17 ab.The trough 8 flattens off both in the direction of the contact post 2 and in the direction of the tips 16, 17.

Ein zwischen Backen 18, 19 (Fig. 7) einer Spannvorrichtung 20 mit seinen Federschenkeln 4, 5 eingebrachtes Kontaktelement 1 zeigt insbesondere in den durch Pfeile D, E, F, G angedeuteten Richtungen eine gute Anlage an den Backen 18, 19.A between jaws 18, 19 ( Fig. 7 ) a tensioning device 20 with its spring legs 4, 5 introduced contact element 1, in particular in the direction indicated by arrows D, E, F, G directions a good contact with the jaws 18, 19th

Zu Beginn des Einsteckens des Kontaktelements 1 in eine Bohrung 21 (Fig. 8a, Fig. 9a) in einer Leiterplatte, deren Bohrung in Fig. 8a - 8c jeweils durch den dunkel eingefärbten Bereich dargestellt ist, werden die Federschenkel 4, 5 zunächst nur in dem an die Vertiefung 8 angrenzenden Bereich zusammengedrückt, so dass der Spalt 3 in diesem Bereich verschwindet und nur noch in dem an die Konturen 12, 13 angrenzenden Bereich erhalten bleibt.At the beginning of insertion of the contact element 1 in a bore 21 (FIG. Fig. 8a . Fig. 9a ) in a circuit board whose bore in Fig. 8a - 8c each represented by the dark colored area, the spring legs 4, 5 are first compressed only in the area adjacent to the recess 8 area, so that the gap 3 disappears in this area and only is still preserved in the contiguous to the contours 12, 13 area.

Bei fortschreitendem Einstecken des Kontaktelements 1 in die Bohrung 21 (Fig. 8b, 8c; Fig. 9b, 9c) verbreitert sich der Spalt 3 in dem an die Konturen 12, 13 angrenzenden Bereich im Querschnitt keilförmig zu einem Spalt 3' (Fig. 8b) und einem Spalt 3" (Fig. 8c), indem die Konturen 12, 13 durch die Innenwandung der Bohrung 21 geführt und dadurch während des Einstecken weiter tordiert werden.With progressive insertion of the contact element 1 in the bore 21 ( Fig. 8b, 8c ; Fig. 9b, 9c ) widens the gap 3 in the contiguous to the contours 12, 13 region in cross-section wedge-shaped to a gap 3 ' Fig. 8b ) and a gap 3 "( Fig. 8c ), by the contours 12, 13 are guided through the inner wall of the bore 21 and thereby further twisted during insertion.

Dabei liegen die Konturen 12, 13 schließlich großflächig an der Innenwandung der Bohrung 21 an und stellen eine breite Kontaktzone mit der Bohrung 21 her, so dass eine hervorragende elektrische Leitfähigkeit und Wärmeleitfähigkeit beim Übergang von den Federschenkeln 4, 5 zu der Bohrung 21 erzeugt werden. Gleichzeitig entstehen großflächige gasdichte Kontaktbereiche 22, 23, in die insbesondere kein Sauerstoff eindringen kann, wodurch Korrosion in den Kontaktbereichen 22, 23 verhindert wird.The contours 12, 13 are finally a large area on the inner wall of the bore 21 and make a wide contact zone with the bore 21 ago, so that excellent electrical conductivity and thermal conductivity during the transition from the spring legs 4, 5 are generated to the bore 21. At the same time arise large-area gas-tight contact areas 22, 23, in particular, no oxygen can penetrate, whereby corrosion in the contact areas 22, 23 is prevented.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Kontaktelementcontact element
22
KontaktpfostenContact post
33
Spaltgap
44
Federschenkelspring leg
55
Federschenkelspring leg
66
Konturcontour
77
Konturcontour
88th
Muldetrough
99
Ausnehmungrecess
1010
Konturcontour
1111
Konturcontour
1212
Konturcontour
1313
Konturcontour
1414
Muldetrough
1515
Muldetrough
1616
Spitzetop
1717
Spitzetop
1818
Backejaw
1919
Backejaw
2020
Spannvorrichtungjig
2121
Bohrungdrilling
2222
Kontaktbereichcontact area
2323
Kontaktbereichcontact area
AA
Achseaxis
BB
Achseaxis
CC
Achseaxis
DD
Pfeilarrow
Ee
Pfeilarrow
FF
Pfeilarrow
GG
Pfeilarrow

Claims (12)

Kontaktelement (1) zur Herstellung einer Steckverbindung mit einer eine innere Wandung aufweisenden Bohrung (21), insbesondere in einer Leiterplatte, wobei das Kontaktelement (1) als Kontaktpfosten (2) mit einem einstückig daran angebrachten Federelement ausgebildet ist, welches zwei zueinander parallele Federschenkel (4, 5) aufweist,
dadurch gekennzeichnet,
dass die Federschenkel (4, 5) in einer eine erste Achse (A) bildenden Steckrichtung durch einen über seine gesamte Länge die gleiche Breite aufweisenden Spalt (3) voneinander getrennt sind, wobei die Federschenkel (4, 5) quer zur Steckrichtung und quer zu der von dem Schlitz gebildeten Öffnung eine konvex gebogene äußere Kontur (6, 7) haben, und dass die Federschenkel (4, 5) während eines Steckvorgangs in der Bohrung (21) in einer zur Steckrichtung transversalen Ebene verformbar sind.Contact element (1) for producing a plug connection with an inner wall having bore (21), in particular in a printed circuit board, wherein the contact element (1) as a contact post (2) is formed with a spring element integrally attached thereto, which two parallel spring legs ( 4, 5),
characterized,
in that the spring legs (4, 5) are separated from one another in a plug-in direction forming a first axis (A) by a gap (3) having the same width over its entire length, wherein the spring legs (4, 5) are transverse to the plugging direction and transverse to the opening formed by the slot have a convexly curved outer contour (6, 7), and that the spring legs (4, 5) during a plugging operation in the bore (21) are deformable in a plane transverse to the plugging direction. Kontaktelement (1) nach Anspruch 1,
dadurch gekennzeichnet,
dass die Federschenkel (4, 5) in Richtung zueinander eine muldenförmige Vertiefung (8) aufweisen.Contact element (1) according to claim 1,
characterized,
that the spring legs (4, 5) towards each other a trough-shaped recess (8). Kontaktelement (1) nach Anspruch 2,
dadurch gekennzeichnet,
dass die Vertiefung (8) der Federschenkel (4, 5) eine im Querschnitt im Wesentlichen trapezförmige Ausnehmung bildet.Contact element (1) according to claim 2,
characterized,
that the recess (8) of the spring legs (4, 5) forms a recess which is essentially trapezoidal in cross-section. Kontaktelement (1) nach Anspruch 2 oder 3,
dadurch gekennzeichnet,
dass während des Steckvorgangs durch die Federschenkel (4, 5) eine Drehbewegung vollziehbar ist.Contact element (1) according to claim 2 or 3,
characterized,
that during the plugging operation by the spring legs (4, 5) a rotational movement is executable. Kontaktelement (1) nach Anspruch 4,
dadurch gekennzeichnet,
dass der Drehpunkt der Drehbewegung im Bereich des Spalts (3) liegt.Contact element (1) according to claim 4,
characterized,
that the pivot point of the rotational movement in the region of the gap (3). Kontaktelement (1) nach Anspruch 5,
dadurch gekennzeichnet,
dass der Drehpunkt der Drehbewegung der Federschenkel (4, 5) während der Dauer des Steckvorgangs veränderbar ist und dass insbesondere der Drehpunkt während der Dauer des Steckvorgangs in Richtung zu der Vertiefung (8) verschiebbar ist.Contact element (1) according to claim 5,
characterized,
in that the point of rotation of the rotary movement of the spring legs (4, 5) is variable during the duration of the plugging operation and in that, in particular, the pivot point is displaceable in the direction of the recess (8) during the duration of the plugging operation. Kontaktelement (1) nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
dass die Federschenkel (4, 5) im Querschnitt quer zur Richtung der ersten Achse auf ihren Außenseiten jeweils viereckförmige Konturen (10, 11; 12, 13) mit verrundeten Ecken aufweisen.Contact element (1) according to one of claims 1 to 6,
characterized,
that the spring legs (4, 5) in cross-section transverse to the direction of the first axis on their outer sides each have quadrangular contours (10, 11, 12, 13) with rounded corners. Kontaktelement (1) nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
dass die Federschenkel (4, 5) im Querschnitt in zu einer zweiten (B) und einer dritten Achse (C) jeweils diagonalen Richtung an den voneinander abgewandten Seiten jeweils eine muldenförmige Ausnehmung (13, 14) aufweisen.Contact element (1) according to one of claims 1 to 7,
characterized,
that the spring legs (4, 5) each have a trough-shaped recess (13, 14) in cross-section in each case to a second (B) and a third axis (C) diagonal direction on the sides facing away from each other. Kontaktelement (1) nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
dass die Federschenkel (4, 5) an ihren einsteckseitigen Spitzen (16, 17) in Einsteckrichtung jeweils verrundet sind.Contact element (1) according to one of claims 1 to 8,
characterized,
that the spring legs (4, 5) are each rounded at their insertion-side tips (16, 17) in the insertion direction. Kontaktelement (1) nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet,
dass der Spalt (3) entgegen der Einsteckrichtung über die Länge der Vertiefung (8) in Richtung zu dem Kontaktpfosten (2) hinausragt.Contact element (1) according to one of claims 1 to 9,
characterized,
that the gap (3) counter to the insertion direction over the length of the recess (8) in the direction of the contact post (2) protrudes. Kontaktelement (1) nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet,
dass die Federschenkel (4, 6) in der ersten Richtung (A) in etwa in der Mitte ihrer Länge jeweils eine breitere Kontur (10, 11) haben, die sich sowohl in Richtung zu dem Kontaktpfosten (2) als auch zu ihren Spitzen (16, 17) hin jeweils verjüngt.Contact element (1) according to one of claims 1 to 10,
characterized,
in that the spring legs (4, 6) in the first direction (A) each have a wider contour (10, 11) approximately in the middle of their length, which extend both in the direction of the contact post (2) and its tips ( 16, 17) towards each tapered. Kontaktelement (1) nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet,
dass die zwischen den Federschenkeln (4, 5) gebildete Vertiefung oder Mulde (8) in der ersten Richtung (A) in Richtung zu dem Kontaktpfosten (2) flacher und in Richtung zu den Spitzen (16, 17) der Federschenkel (4, 5) ebenfalls flacher ausgebildet ist.Contact element (1) according to one of claims 1 to 11,
characterized,
in that the recess or depression (8) formed between the spring legs (4, 5) is flatter in the first direction (A) in the direction towards the contact post (2) and towards the tips (16, 17) of the spring legs (4, 5) ) is also flatter.
EP14003404.2A 2013-10-02 2014-10-02 Electrical contact element for a plug-in connection with a circuit board Not-in-force EP2858180B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201320008679 DE202013008679U1 (en) 2013-10-02 2013-10-02 Electrical contact element for a plug connection with a printed circuit board

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Publication Number Publication Date
EP2858180A1 true EP2858180A1 (en) 2015-04-08
EP2858180B1 EP2858180B1 (en) 2017-04-12

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ID=51661853

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DE (1) DE202013008679U1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138309A1 (en) * 1983-08-04 1985-04-24 System Kontakt Gesellschaft für elektronische Bauelemente mbH Compliant press-fit electrical contact
DE4132996A1 (en) * 1991-05-16 1992-11-19 Telefunken Systemtechnik Contact pin with solder tag for circuit board - has slit in underside of tag with varying width for reception and retention of liq. solder
EP0831558A2 (en) 1996-09-20 1998-03-25 Molex Incorporated Press-fit pin for use in a printed circuit board
JP2000332370A (en) * 1999-05-21 2000-11-30 Sanwa Denki Kogyo Co Ltd Compliant terminal
US6231402B1 (en) * 1998-04-14 2001-05-15 Nec Corporation Press-in contact and manufacturing method thereof
US6338632B1 (en) * 2000-07-05 2002-01-15 Hon Hai Precision Ind. Co., Ltd. Compliant, press fit electrical contact having improved retention

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028202B4 (en) * 2004-06-09 2006-10-05 Veigel, Andreas, Ing.(grad.) press-fit
JP5541305B2 (en) * 2012-03-16 2014-07-09 第一精工株式会社 Connector terminal for press-fit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138309A1 (en) * 1983-08-04 1985-04-24 System Kontakt Gesellschaft für elektronische Bauelemente mbH Compliant press-fit electrical contact
DE4132996A1 (en) * 1991-05-16 1992-11-19 Telefunken Systemtechnik Contact pin with solder tag for circuit board - has slit in underside of tag with varying width for reception and retention of liq. solder
EP0831558A2 (en) 1996-09-20 1998-03-25 Molex Incorporated Press-fit pin for use in a printed circuit board
US6231402B1 (en) * 1998-04-14 2001-05-15 Nec Corporation Press-in contact and manufacturing method thereof
JP2000332370A (en) * 1999-05-21 2000-11-30 Sanwa Denki Kogyo Co Ltd Compliant terminal
US6338632B1 (en) * 2000-07-05 2002-01-15 Hon Hai Precision Ind. Co., Ltd. Compliant, press fit electrical contact having improved retention

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DE202013008679U1 (en) 2015-01-05

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