EP2615696B1 - Kontakt für Kraftpressverbindung - Google Patents

Kontakt für Kraftpressverbindung Download PDF

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Publication number
EP2615696B1
EP2615696B1 EP20130151020 EP13151020A EP2615696B1 EP 2615696 B1 EP2615696 B1 EP 2615696B1 EP 20130151020 EP20130151020 EP 20130151020 EP 13151020 A EP13151020 A EP 13151020A EP 2615696 B1 EP2615696 B1 EP 2615696B1
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EP
European Patent Office
Prior art keywords
branches
contact
prong
opening
thickness
Prior art date
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Active
Application number
EP20130151020
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English (en)
French (fr)
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EP2615696A1 (de
Inventor
Bertrand Chague
Philippe Abgrall
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.)
Axon'Mechatronics
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Axon'Mechatronics
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Publication of EP2615696A1 publication Critical patent/EP2615696A1/de
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Classifications

    • 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 intended to be fitted or inserted into force in a hole arranged for this purpose in a printed circuit.
  • This contact is used more particularly to circulate a high intensity current, for example 20 to 35 amperes.
  • these contacts can be used to fix electrical components, mechatronic or electromechanical on a printed circuit after it has been made.
  • the axial support exerted by the contact via its support portion generates mechanical stresses in the printed circuit, which are likely to deform it and as a result of damaging some of the components fixed on it.
  • support portions does not provide a satisfactory solution to ensure a satisfactory fit of contacts of the type presented in introduction, intended to be force-fitted into a hole in a printed circuit board.
  • the object of the invention is to provide a force-fitting contact in an insertion hole formed in a printed circuit, the contact comprising a heel and a rod; the rod having an elongate opening dividing the rod, at a certain axial distance from the heel, into two branches; the rod having a first end formed integrally with the heel, and a second end on the side opposite the heel; contact that can be engaged with a relatively constant force, regardless of the diameter of the insertion hole in the range of allowable diameters, and has an extraction force also sufficient in the same range of diameters.
  • 'opening' means a passage through the rod from side to side, along an axis perpendicular to the axis of the rod, as a needle eye; "Heel” means a portion of the contact which widens considerably relative to the rod, forming a shoulder.
  • the width of the opening is decreasing in the third and fourth parts means that the width decreases (generally progressively) in these parts, with possibly one or more portions of constant width in these parts; however it is excluded that there is an increase in the width in the direction towards the second end of the rod.
  • a part has a generally decreasing thickness (in the direction of the first towards the second end of the stem) only signifies that the thickness of the branches at the end of this part which is on the side of the first end the rod is greater than the thickness of the branches at the end of this part which is on the side of the second end. It follows that in this part, the branches may optionally comprise a portion of increasing thickness.
  • the 'generally increasing thickness' or 'overall decreasing thickness' portions are respectively 'increasing thickness' or 'decreasing thickness'.
  • the indication that a part has a decreasing thickness (in a given direction) then means that the thickness only decreases, possibly with one or more bearings, in the considered direction, without being able to increase locally; and the indication that a part has an increasing thickness has the opposite meaning.
  • the characteristics indicated relate to the contact in the unconstrained state, that is to say when it is not inserted into the printed circuit.
  • the stem Due to the presence of the opening and the thickness profiles of the different parts of the branches of the stem, the stem has a part curved having a width (in the transverse direction) called 'maximum width'.
  • This maximum width is chosen to be greater than the diameter of an insertion hole provided in a printed circuit, and in which the contact must be inserted.
  • the profile of the branches of the stem with the four parts stated above leads to the existence of a maximum thickness of branches at a plane extending between the second and third parts. This maximum is arranged axially between two planes of minimum thickness, which respectively separate the first and second parts, and the third and fourth parts.
  • branches have a certain rigidity in their central part, most of the plastic deformation occurring at the minimum thickness planes, generally relatively close to the ends of the branches.
  • the two branches of the contact can be likened to a bi-recessed beam.
  • the maximum stresses occur at the two embeddings, which leads to having a part of maximum plastic deformation in the vicinity of these.
  • the forces necessary for the insertion or respectively the extraction of the contact remain in the predefined ranges desired for these forces, and this in a wide range of values for the diameter of the insertion hole in the printed circuit.
  • the retention reliability provided by the contact according to the invention also makes it possible not to provide heel support on the printed circuit to maintain the axial position of the contact.
  • This lack of support also reduces the risk of tin wiskers forming (tin filaments that form spontaneously some time after the insertion of the contact in the printed circuit), by removing the mechanical stresses between the support surface of the heel and the metallized hole of the circuit board.
  • the thickness of the branches varies continuously, in order to avoid stress concentrations in the branches.
  • each of the branches has an inner surface facing the other leg, and an outer surface on a side opposite to the inner surface.
  • a second object of the invention is to provide an electrical component, mechatronic or electromechanical, comprising at least one contact adapted to be inserted into an insertion hole arranged in a printed circuit; said at least one contact being such that, when mounting the component to the rest of the circuit, it can be inserted into the insertion hole with a relatively constant force, regardless of the diameter of this hole in a predefined range of diameters admissible, the extraction force also remaining sufficient in this same range of diameters.
  • said at least one contact is a contact as defined above.
  • the component can be in particular a connector, that is to say a component connected to a cable.
  • a third object of the invention is to provide a printed circuit, comprising at least one component, electrical, mechatronic or electromechanical, at least one contact is inserted into an insertion hole arranged in the printed circuit; said at least one contact being such that during assembly of the component it could have been inserted into the insertion hole with a relatively constant force, irrespective of the diameter of this hole within a predefined range of permissible diameters, the force extraction also remaining sufficient in this same range of diameters.
  • the contact is a contact as defined above.
  • the contacts 10 objects of the invention are manufactured by cutting and forming, in this case from bronze sheets. Any other conductive material with similar mechanical properties could also be used.
  • Figures 1A , 1B and 1C represent contacts formed in sheets of respective thicknesses 1 mm, 0.8 mm and 0.6 mm.
  • the contacts 10 are formed by cutting into these bronze sheets. It follows that the contacts 10 have a constant section throughout the thickness of the sheet, that is to say that their section is the same regardless of the plane considered parallel to the faces of the sheet.
  • the shape of the contacts 10, in the different embodiments is simply defined by front views 1A, 1B and 1C.
  • the foregoing is not, however, entirely accurate for the lower and upper planes of the contacts. Indeed, the corners of the protruding edges of the contacts 10 are rounded and have connecting fillet 12. This softening of the protruding edges is intended to prevent the formation of chips during the insertion of the contacts 10 in the printed circuits.
  • the contacts 10 are contacts intended to be fitted or forcibly inserted into insertion holes 45 arranged in printed circuits.
  • FIG. 1A and 3 represent a first embodiment of the contact 10, on the one hand in the state without constraint ( Fig.1A ), and secondly fitted into a hole 45 of a printed circuit 50 ( Fig.3 ).
  • the printed circuit 50 is in the form of a flat plate.
  • the hole 45 is a cylindrical hole of diameter D, formed in the circuit 50 perpendicular to the surface 52 thereof. To allow a durable maintenance of the contact 10 and ensure that the electrical current can flow well from the contact to the printed circuit, the hole 45 is equipped with a cylindrical sleeve 60, within which the contact 10 is inserted.
  • the contact 10 is in the general form of a rod 30, formed integrally with a heel 20.
  • the rod 30 has an elongated opening (or passageway) 32 which passes through the contact 10 in a Y direction which is both perpendicular to the X axis of the rod and to the general plane of the contact.
  • the opening 32 divides the rod into two branches 34A and 34B.
  • the contact 10 is symmetrical with respect to the XY plane.
  • the rod 30 has a connecting portion 14 which connects the branches 34A, 34B to the heel.
  • This joining portion 14 has parallel edges 15.
  • the rod extends beyond the branches 34A, 34B by a tip 16, which constitutes the free end of the contact 10.
  • This tip 16 has a general shape of decreasing width in order to facilitate the insertion of the contact 10 into the hole d insertion 45.
  • the opening 32 is formed at a certain distance d nonzero of the heel. Thanks to this distance, the opening 32 can play its role, which will be specified later, when the contact 10 is placed inside the insertion hole of the circuit 50, without any contact ( generator of mechanical stresses) between the heel 20 and the circuit 50.
  • the contact 10 is placed coaxially with the X axis of the hole 45 and then moved in the insertion direction A to the desired insertion position.
  • the maximum width L of the branches of the contact 10 is intended to be greater than the diameter D of the hole 45.
  • the insertion of the contact 10 in the hole 45 forces the two legs 34A, 34B to come into contact with the edge of the hole 45 and then gradually to compress radially and move closer to each other.
  • the contacts object of the invention are structured so that the insertion and extraction forces remain in fairly narrow ranges, and this in a relatively wide range of values of the diameter D of the insertion hole.
  • the first end 36 of the rod is formed integrally with the heel 20.
  • a first parameter that determines the effectiveness of the contact 10 is the thickness T of the branches 34A, 34B of the contact. This thickness T is measured in the transverse direction Z, perpendicular to the X directions of the rod 30 and Y of the opening 32.
  • the thickness T of the branches is counted along the axis X of the rod with respect to the axial extent E of the opening 32.
  • 0% of the extent E corresponds to the plane in which the branches 34A, 34B are born at the first end 36 of the opening 32, and 100% of the extent E corresponds to the last plane in which the branches are formed, on the side of the second end 37.
  • each of the branches 34A, 34B is constituted successively, in a direction away from the heel, by a first part 41 of generally decreasing thickness; a second portion 42 of generally increasing thickness, a third portion 43 of generally decreasing thickness, and a fourth portion 44 of generally increasing thickness.
  • the thickness of the branches is substantially decreasing and then substantially increasing.
  • these parts are respectively of decreasing and increasing thickness, but that is tolerated on a portion of the branches, of reduced axial extension, a variation of the thickness of the branches in the opposite direction, as that which appears on the Figure 2A in Part 41, in the vicinity of Part 42.
  • the thickness of the branches is substantially decreasing and then substantially increasing. This means that these parts are respectively of decreasing and increasing thickness, only being tolerated on a portion of the branches, of reduced axial extension, a variation of the thickness of the branches in the opposite direction.
  • the second important parameter is the width of the opening 32. This width decreases in the third and fourth parts. This causes the branches 34A and 34B to maintain a relatively large thickness on the side of the free end of the contact (end opposite the heel).
  • the plasticization of the rod occurs mainly at the ends of the branches which are on the side of the first end of the rod.
  • the radial elastic force F has an intensity less than that which would be in the absence of plasticization.
  • the plasticization occurs mainly at the end of the branches on the side of the heel, because of the small width of the opening near the free end of the contact, the end of the branches close to the free end of the contact retains a wide range of elastic deformation and therefore, the force required to insert the contact remains moderate.
  • first plane P which separates the second and third parts is situated according to the embodiments presented between 50% and 70% of the axial extent of the branches.
  • first plane P the inner surfaces of the branches have protruding portions S.
  • the opening 32 generally has an enlarged portion at the first and second portions, which extends in the direction of the second end of the rod by a portion of decreasing width at the second and third and fourth portions. As a result, the opening 32 has, in the direction from the first to the second end of the rod, on its axial extent, a width W increasing and decreasing.
  • each of the internal surfaces of the branches has a concave portion 24.
  • the maximum width W of the opening 32 is at the level of the second part, not far from the first part.
  • these concave portions 24 extend over the entire first portion and a large portion of the second portion.
  • the first part is stiffened by a portion of increasing thickness.
  • each of the inner surfaces 38 has a projecting portion S '.
  • the concave portions 24 are thus in the extension of these protruding portions S 'on the free end side of the rod 30.
  • the concave portions 24 extend on the end of the first portion 41 (on the side of the second end 37 of the rod) and a large part of the second part 42.
  • the inner surfaces 38 of the branches 34A, 34B form parallel planes (axially) of the third part. This allows for a plan in which the branches have a minimum thickness, at the junction between the third and fourth parts.
  • the outer surfaces 54 of the branches consist essentially of a curved portion 56, of cylindrical shape (of axis parallel to the Y axis). This shape allows a regular distribution of the forces that apply to the point of contact between the outer surfaces 54 and the inner surface of the hole 45.
  • the curved portion 56 extends over the entire axial extension of the branches, and extends even slightly over the junction portion 14 and the tip 16 of the rod 30.
  • the curved portions 56 do not extend over the entire first portion 41, but instead extend from the side of the heel 20 by straight portions 58.
  • These straight portions 58 consist of portions of planes perpendicular to the Z axis. In this embodiment, the curved portions 56 therefore only extend over 70% of the axial extent of the branches.
  • the straight portions 58 and the edges 15 of the joining portion 14 extend in the same parallel planes.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)

Claims (12)

  1. Kontakt (1) für ein Aufpressen in ein in einer gedruckten Schaltung ausgebildetes Einsetzloch, wobei der Kontakt einen Fuß (20) und einen Schaft (30) umfasst,
    wobei der Schaft eine langgestreckte Öffnung (32) aufweist, die den Schaft in einem bestimmten axialen Abstand von dem Fuß in zwei Schenkel (34A, 34B) unterteilt,
    wobei der Schaft ein erstes Ende (36), das mit dem Fuß integral ausgebildet ist, und ein zweites Ende (37) auf der von dem Fuß abgewandten Seite aufweist, und
    wobei in einer Hinrichtung von dem ersten zu dem zweiten Ende des Schaftes ein jeder der Schenkel nacheinander durch einen ersten Teil (41) mit allgemein abnehmender Dicke, einen zweiten Teil (42) mit allgemein zunehmender Dicke, einen dritten Teil (43) mit allgemein abnehmender Dicke und einen vierten Teil (44) mit allgemein zunehmender Dicke gebildet ist, und
    wobei in einer Hinrichtung von dem ersten zu dem zweiten Ende des Schaftes eine Breite (W) der Öffnung in dem vierten Teil abnehmend ist,
    wobei der Kontakt dadurch gekennzeichnet ist, dass die Breite (W) der Öffnung in dem dritten Teil abnehmend ist.
  2. Kontakt nach Anspruch 1, wobei eine erste Ebene (P), die den zweiten und den dritten Teil trennt, bei mehr als 45 % und vorzugsweise bei mehr als 50 % der axialen Erstreckung (E) der Schenkel gelegen ist.
  3. Kontakt nach Anspruch 1 oder 2, wobei eine erste Ebene (P), die den zweiten und den dritten Teil trennt, bei weniger als 70 % der axialen Erstreckung (E) der Schenkel gelegen ist.
  4. Kontakt nach einem der Ansprüche 1 bis 3, wobei ein jeder der Schenkel eine gegenüber dem anderen Schenkel gelegene Innenfläche (38) aufweist und im Bereich einer ersten Ebene (P), welche den zweiten und den dritten Teil trennt, eine jede der Innenflächen einen vorspringenden Abschnitt (S) aufweist.
  5. Kontakt nach einem der Ansprüche 1 bis 4, wobei ein jeder der Schenkel eine gegenüber dem anderen Schenkel gelegene Innenfläche (38) aufweist und im Bereich axial von einem Abschnitt des ersten Teils (41) eine jede der Innenflächen einen vorspringenden Abschnitt (S') aufweist.
  6. Kontakt nach einem der Ansprüche 1 bis 5, wobei ein jeder der Schenkel eine gegenüber dem anderen Schenkel gelegene Innenfläche (38) und eine Außenfläche (54) auf einer von der Innenfläche abgewandten Seite aufweist, eine jede der Außenflächen einen gewölbten Abschnitt (56), insbesondere von zylindrischer Form, umfasst, der sich wenigstens von 35 % bis 80 % der axialen Erstreckung der Schenkel erstreckt.
  7. Kontakt nach einem der Ansprüche 1 bis 6, wobei das Verhältnis zwischen der maximalen Breite der Öffnung (32) und der maximalen Breite (L) des Schaftes zwischen 0,28 und 0,5 beträgt.
  8. Kontakt nach einem der Ansprüche 1 bis 7, wobei die innere Öffnung in der Hinrichtung von dem ersten zu dem zweiten Ende des Schaftes, über die gesamte axiale Erstreckung des Schaftes, eine zunehmende, dann abnehmende Breite aufweist.
  9. Kontakt nach einem der Ansprüche 1 bis 8, wobei eine maximale Breite (W) der Öffnung sich in der ersten Hälfte der axialen Erstreckung (E) der Schenkel befindet.
  10. Kontakt nach einem der Ansprüche 1 bis 9, wobei eine Ebene maximaler Breite der Öffnung dem Fuß axial näher gelegen ist als eine Ebene maximaler Breite des Schaftes.
  11. Elektrisches, mechatronisches oder elektromechanisches Bauelement, insbesondere ein Verbinder, umfassend wenigstens einen Kontakt nach einem der Ansprüche 1 bis 10.
  12. Gedruckte Schaltung, umfassend wenigstens ein Bauelement nach Anspruch 11, und wobei ein Kontakt unter dem wenigstens einen Kontakt des wenigstens einen Bauelements in ein in der Schaltung ausgebildetes Einsetzloch eingesetzt ist.
EP20130151020 2012-01-12 2013-01-11 Kontakt für Kraftpressverbindung Active EP2615696B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1250319A FR2985864B1 (fr) 2012-01-12 2012-01-12 Contact pour emmanchement en force

Publications (2)

Publication Number Publication Date
EP2615696A1 EP2615696A1 (de) 2013-07-17
EP2615696B1 true EP2615696B1 (de) 2015-05-20

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Application Number Title Priority Date Filing Date
EP20130151020 Active EP2615696B1 (de) 2012-01-12 2013-01-11 Kontakt für Kraftpressverbindung

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EP (1) EP2615696B1 (de)
FR (1) FR2985864B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015225701A (ja) * 2014-05-26 2015-12-14 株式会社オートネットワーク技術研究所 プレスフィット端子
EP3544121B1 (de) * 2018-03-19 2022-05-04 Mahle International GmbH Elektrische heizvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9004090U1 (de) * 1990-04-09 1990-06-13 ELCO Elektronik GmbH, 5240 Betzdorf Einpreßkontakt
DE19726759A1 (de) * 1997-06-24 1999-01-07 Elco Europ Gmbh Einpreßkontakt
US7008272B2 (en) * 2003-10-23 2006-03-07 Trw Automotive U.S. Llc Electrical contact

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Publication number Publication date
FR2985864B1 (fr) 2014-02-07
FR2985864A1 (fr) 2013-07-19
EP2615696A1 (de) 2013-07-17

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