EP3016208B1 - Electric device comprising a contact assembly and manufacturing methof of a enclosure of a contact assembly - Google Patents

Description

The invention relates to an electronic device comprising a contact arrangement of a stamped grid and a terminal according to the preamble of claim 1 and a corresponding terminal contact, an electronic device and a method for producing this device.

Punching grids are known for central electrical systems of motor vehicles. For example, reference is made to the DE 197 13 008 C1 , Knife contacts and blade receiving contacts are used to electrically connect fuses, relays and other electrical or electronic components that have a blade receiving contact or a blade contact. The contacts of the components are inserted into or onto the connection contacts of the stamped grid.

A related type contact arrangement with punched grid and with a terminal contact, which has two contact springs, which are integral with each other in a foot area, is in the EP 1 301 063 B1 described. A related connection contact is in EP 1 531 522 B1 described.

In DE 10 2013 111 963 A1 a plate element with Tiefziehbohrung for press-fit contacts is shown. The plate member has collar portions which are made by deep drawing and which are arranged on a recess of the plate member. In this recess, a contact element can be inserted, which deforms when inserted into the recess.

In EP 1 301 063 B1 a punched grid is shown with a terminal contact and a blade receiving contact. The stamped grid is encapsulated with plastic. The connection contact is in the Punching grid can be pressed or pressed in order to achieve high mechanical strength.

The invention has for its object to provide an electronic device having an improved tolerance to vibration and an increased contact area in relation to the space required.

This object is achieved by an electronic device according to claim 1.

The invention describes an electronic device according to claim 1 comprising a contact arrangement for electrical contacting, wherein the contact arrangement comprises at least one stamped grid and a connection contact for electrically contacting the contact arrangement, wherein the stamped grid has an opening for insertion of the terminal and protruding from an opening plane clamping means, wherein a clamping portion of the terminal contact at least partially inserted into the opening and mechanically fixable by means of the clamping means to form an electrically conductive contact surface, wherein the clamping portion has latching means which are latched to the clamping means in such a way that movement of the terminal against a direction of insertion of the terminal is prevented, wherein the stamped grid is bordered by a skirt, which has a recess for at least partially receiving the clamping means and the Klemmabschnit ts. The mechanical fixation of the clamping portion is in particular solvable.

Advantageously, a cost-producible contact arrangement is thus provided, by means of which a vibration-tolerant electrical contact can be realized, whereby voltage drops or voltage peaks can be avoided. It can also be provided in an advantageous manner in relation to the space requirement of the contact arrangement comparatively large contact area for power transmission between the lead frame and the terminal contact, whereby larger currents are transferable or the risk of electrical overloads can be reduced because the current density over the contact surface at same space requirement may be lower. The number of connection contacts, for example, a grouped connection contact, can thus be reduced, whereby the space required in relation to the transmittable power is lower and lower costs arise. Due to a possible improved design specification of the contact surface of the contact resistance is better predictable, since there is a lower dispersion of these values. This allows a longer life of the contact arrangement and / or a lower signal or power loss. In the case of shocks can be made possible by means of the contact arrangement according to the invention, an automatic return of the terminal in a desired position.

The opening plane is based on the surrounding stamped grid as well as conceivable by the originally existing at this point stamped grid area. In many cases, the imaginary opening plane thus corresponds to a surface or plane formed by the further stamped grid in the vicinity of the opening.

According to a preferred embodiment of the contact arrangement according to the invention, the clamping means act to form the mechanically releasable fixation with inserted connection contact by means of an elastic restoring force on the clamping portion. As a result, the clamping portion is subject to a clamping effect, whereby a position-tolerant mechanical Fixation is realized. The clamping forces or the forces for forming the contact surface can be specified according to the requirements. Mechanical wear and associated contamination can thus be reduced. It is in the fixation thus a detachable connection.

The clamping means are preferably arranged opposite one another in such a way that opposite directions of action of the elastic restoring forces result.

The clamping portion preferably has at least two oppositely directed at an opening angle surfaces for connecting to the clamping means of the stamped grid and forming an electrically conductive connection.

According to one embodiment of the invention, the clamping means are arranged opposite each other with an opening angle to each other, which has another - especially lower - value to form the elastic restoring forces of the clamping means with inserted connection contact, as in non-plugged connection contact.

The clamping portion preferably has latching means which can be latched to the clamping means in such a way that movement of the connection contact in at least one direction of movement, in particular against a direction of insertion of the connection contact, is prevented. The connection contact thus has in the mounted state a preferably against a direction of insertion restricted freedom of movement, whereby a falling out or simple withdrawal is avoided. Locking means may expediently also be provided or only on the clamping means.

When inserting the terminal contact the clamping means are first opened by the locking means in such a way that results in a smaller opening angle of the clamping means until they occupy an opening angle after engagement of the locking means, which is smaller than the opening angle in the original position.

The clamping means expediently protrude out of the stamped grid in a direction opposite to the contact springs.

Preferably, the clamping means formed components of the stamped grid and with this in one piece. It is in the clamping means expediently partly punched or pronounced and bent components of the stamped grid, whereby a particularly inexpensive production is possible.

To increase the current carrying capacity is preferably carried out a grouping of multiple terminals to a common terminal contact. The grouping can be carried out, for example, by punching the separate connection contacts and subsequent joining or by cold forming of the grouped connection contact or the separate connection contacts and subsequent assembly. By appropriate design can be dispensed with a grouping when the individual terminal contact, for example, has a greater thickness.

The stamped grid is preferably enclosed by means of a mount, for example a housing component of an electronic device, which has a recess for at least partially Receiving the clamping means and the clamping portion. The enclosure is preferably designed such that a separation of different work areas, in particular an electronic device is realized. Using the contact arrangement according to the invention, a particularly cost-effective production of an enclosed contact arrangement for electrically contacting functional assemblies of separated work areas can be carried out without having to provide additional components, which in particular would have to be manufactured and assembled separately. This can save material and process costs. Often it is necessary, for example within an electronic device such areas of different work environments, such as purity class, temperature and / or pressure to provide and separate them from each other, in particular so that no possible unilateral or mutual influence takes place. This can be, for example, the separation of a region of supply electronics from a region of an electrical consumer, for example an electric motor, whose working environment is not subject to such restrictive purity conditions. The electrical supply or signal transmission via this delimitation must nevertheless be ensured without limiting the insulating effect separating the areas.

The clamping section is preferably flat or curved in areas for forming the contact surfaces. The clamping means are expediently likewise formed either flat or arcuate in areas for forming the contact surfaces. In particular, for an embodiment of the contact arrangement in which the clamping sections and the clamping means are designed arcuate in areas for forming a contact surface, further degrees of freedom result the movement of the terminal, whereby manufacturing and / or assembly tolerances compensated and mechanical stresses can be avoided in particular on the contact surfaces of the contact arrangement.

The terminal contact and / or the clamping means may have coatings for improving the electrical conductivity or reducing corrosion. In particular, a coating may be provided only in the region of the intended contact surface.

The stamped grid is preferably enclosed by means of a border, which has a recess for at least partially receiving the clamping means and the clamping section. The enclosure expediently forms a housing part of an electronic device comprising the contact arrangement.

Furthermore, the invention relates to a connection contact for connection to a stamped grid, which is characterized in that the clamping portion has at least two mutually oppositely oriented surfaces for connecting with clamping means of a stamped grid and forming an electrically conductive connection.

Preferably, the terminal contact for receiving a blade contact is formed, which has two spaced apart by a Einsteckschlitz contact springs, which are integral with each other in a clamping portion. Alternatively, it is preferred that the connection contact is designed for pressing into a contacting opening, for example a printed circuit board. This can be done in an advantageous manner, a direct and screwless contacting the contact arrangement with a circuit board, with an automated assembly is possible. To this end can be provided for introducing a Einpressbereichs of the terminal contact holes.

The enclosure separates according to a preferred embodiment within the electronic device different work areas, in particular a range of supply electronics of a range of an electrical load.

The invention further describes a method according to claim 9 for producing an enclosure of the contact arrangement according to the invention, in which a molding for forming a contact arrangement at least partially receiving recess is at least partially introduced into an opening of a stamped grid, wherein clamping means covered by the stamped grid clamping means by the molding in Insertion direction are deflected and due to their elastic restoring forces a clamping force is exerted on the molding in such a way that the stamped grid is mechanically fixed with respect to the molding, and then an injection molding material is injected into the stamped grid at least partially comprehensive injection molding tool.

Preferably, the clamping means are brought by introducing the molding in a reversible deflection of about 90 ° with respect to the stamped grid.

The molded part preferably projects beyond the ends of the deflected clamping means in the inserted state. As a result, in particular the engagement of the latching means or the clamping portion of the terminal contact can take place later.

By means of the method according to the invention, in a single injection molding process, a border enclosing a stamped grid be realized, which is designed for the separation of different work areas, in particular an electronic device. Furthermore, the undercuts preferably provided for the contact arrangement according to the invention are realized in the enclosure.

Further preferred embodiments will become apparent from the subclaims and the following description of exemplary embodiments with reference to figures.

Fig. 1

ein Ausführungsbeispiel der erfindungsgemäßen Kontaktanordnung 1 in montiertem Zustand in Schnittdarstellung,

Fig. 2

Ausführungsbeispiele der erfindungsgemäßen Kontaktanordnung 1 in montiertem Zustand mit verschiedenen Anschlusskontakten 2 in Schnittdarstellung,

Fig. 3

eine Ausführungsform eines Stanzgitters 3 gemäß der Erfindung,

Fig. 4

eine Detaildarstellung eines beispielhaften Kontaktbereichs A der Kontaktanordnung 1,

Fig. 5

Darstellungen einer zeitliche Abfolge beim kontaktieren von Anschlusskontakt 2 mit Stanzgitter 3,

Fig. 6

Ausführungsbeispiele gruppierter Anschlusskontakte gemäß der Erfindung in perspektivischer Darstellung,

Fig. 7

weitere bevorzugte Ausführungsformen des Anschlusskontakts 2 und Stanzgitters 3 der erfindungsgemäßen Kontaktanordnung 1,

Fig. 8

einen gruppierten Anschlusskontakt gemäß der Ausführungsform der Fig. 7,

Fig. 9

vorhandene Freiheitsgrade des Anschlusskontakts 2 gemäß dem Ausführungsbeispiel der Fig. 7 und 8,

Fig. 10

verschiedene perspektivische Darstellungen weiterer bevorzugter Ausführungsformen des Anschlusskontakts 2 und Stanzgitters 3 der erfindungsgemäßen Kontaktanordnung 1,

Fig. 11

Kontaktanordnung 1, umfassend die Ausführungsformen des Anschlusskontakts 2 und Stanzgitters 3 gemäß Fig. 10,

Fig. 12

einen in eine Kontaktierungsöffnung einer Leiterplatte 5 eingebrachten Anschlusskontakt 2 gemäß der Ausführungsform nach Fig. 10,

Fig. 13

ein Einbringungsvorgang von Anschlusskontakt 2 zur Kontaktierung mit Stanzgitter 3 am Beispiel der Ausführungsform gemäß Fig. 11,

Fig. 14

ein Kraft-Weg Diagramm der Kontaktanordnung 1 am Beispiel der Ausführungsform gemäß Fig. 11,

Fig. 15

eine Anordnung zur Erläuterung des erfindungsgemäßen Spritzgussverfahrens zur Herstellung einer Einfassung 4 der erfindungsgemäße Kontaktanordnung 1 und

Fig. 16

eine bevorzugte Ausführungsform von Formteil 10 zur Einbringung in Öffnung 3.1 von Stanzgitter 3.

The invention will be explained in more detail with reference to embodiments illustrated in the drawings. Show it

Fig. 1

An embodiment of the contact arrangement 1 according to the invention in the assembled state in a sectional view,

Fig. 2

Embodiments of the contact arrangement 1 according to the invention in the assembled state with different terminal contacts 2 in a sectional view,

Fig. 3

an embodiment of a stamped grid 3 according to the invention,

Fig. 4

a detailed representation of an exemplary contact area A of the contact arrangement 1,

Fig. 5

Representations of a chronological sequence when contacting terminal 2 with stamped grid 3,

Fig. 6

Exemplary embodiments of grouped connection contacts according to the invention in perspective view,

Fig. 7

Further preferred embodiments of the terminal 2 and punched grid 3 of the contact arrangement 1 according to the invention,

Fig. 8

a grouped terminal contact according to the embodiment of Fig. 7 .

Fig. 9

existing degrees of freedom of the terminal 2 according to the embodiment of the Fig. 7 and 8th .

Fig. 10

various perspective views of further preferred embodiments of the terminal 2 and punched grid 3 of the contact arrangement 1 according to the invention,

Fig. 11

Contact arrangement 1, comprising the embodiments of the terminal 2 and punched grid 3 according to Fig. 10 .

Fig. 12

a introduced into a contact hole of a printed circuit board 5 terminal contact 2 according to the embodiment according to Fig. 10 .

Fig. 13

an insertion process of terminal 2 for contacting with stamped grid 3 using the example of the embodiment according to Fig. 11 .

Fig. 14

a force-displacement diagram of the contact arrangement 1 using the example of the embodiment according to Fig. 11 .

Fig. 15

an arrangement for explaining the injection molding method according to the invention for producing a skirt 4 of the contact arrangement 1 and the invention

Fig. 16

a preferred embodiment of molded part 10 for insertion into opening 3.1 of stamped grid. 3

To provide a brief and simple description of the embodiments, like elements are given the same reference numerals.

FIG. 1 shows a sectional view of an embodiment of the contact arrangement 1 according to the invention in the contacted state, which has at least terminal contact 2 and punched grid 3, wherein stamped grid 3 is bordered by enclosure 4. Mount 4 has a recess 4.1 for receiving the contact arrangement 1. Terminal contact 2 is preferably a Blechstanz- and embossed part, which is designed as a blade receiving contact (spring contact). This has two contact springs 2.1, which are separated by a plug-in slot 2.2. The insertion slot 2.2 is open at one end and is provided for insertion of a knife contact, not shown, between the two contact springs 2.1. At the open end of the insertion slot 2.2, the contact springs 2.1 free. At a closed end of the insertion slot 2.2, the contact springs 2.1 merge in one piece into the clamping section 2.3, which is designed to be inserted into a designated opening 3.1 of stamped grid 3. Clamping section 2.3 is configured according to the example with a flat surface to form a flat contact surface with clamping means 3.2 of lead frame 3 and has at the two ends locking means 2.4. The ends may preferably be flexible or rigid. Punching grid 3 has in the region of the opening 3.1 on opposite, protruding from the plane of the stand grid 3, flexible or rigid clamping means 3.2, which has a flat contact area for Providing contact of punched grid 3 with connection contact 2. The clamping means are preferably realized by means of deformation, in particular bending, of a component of the stamped grid or by means of joining corresponding elements to the stamped grid 3. The locking means 2.4 are locked in the mounted state to the not bordered by enclosure 4 ends of the clamping means 3.2. Alternatively, latching openings can also be provided in the clamping means 3.2 for latching the latching means 2.4.

Embodiments of contact arrangement 1 with exemplary dimensions are in the subfigures a) and b) of FIG. 2 shown, which differ by a different width training of the arcuate clamping portion 2.3 in the connection region of the contact springs 2.1, whereby - alternatively to a choice according to different materials - among other things, the flexibility of the ends of the clamping portion 2.3 can be made variable. Preferably, terminal contact 2 is designed in such a way that clamping forces have the lowest possible impact on the distance defined by insertion slot 2.2 of the contact springs 2.1, otherwise, for example, an increased distance may result after assembly of terminal 2 and optionally the electrical connection to the insertion slot 2.2 adversely affect knife contact to be introduced. The embodiment according to Fig. 2 b) Due to the wider design of the clamping portion 2.3 in the connecting region of the contact springs 2.1 an improved stiffness against deformations of this kind compared to the embodiment of Fig. 2 a) , Another way to ensure a Einsteckschlitzes 2.2 with the expected dimensions in the assembled state, for example, a design of the insertion slot 2.2 with a shorter distance of the contact springs 2.1 in the unassembled state, so that after the assembly results in the expected spacing as a result of the clamping forces, or a thicker material thickness and / or joining or grouping a plurality of terminal contacts 2, which may lead to higher manufacturing costs.

Another preferred embodiment of terminal contact 2 is in Fig. 2c) shown, which advantageously allows particularly low mechanical loads on the contact springs 2.1 and the clamping section 2.3, resulting in comparatively little impact on slot 2.2. This lower power transmission results in particular from the laterally arranged recesses 2.5 in the transition from the contact springs 2.1 to the clamping section 2.3.

In Fig. 3 an exemplary embodiment of stamped grid 3 is shown with dimensions in a front, top and side view, in which in an unassembled state of terminal 2 for opening angle α of the clamping means 3.2 are provided about 50 °. Opening 3.1 is rectangular in shape, as can be seen from the top view. The embodiments described and shown in the figures have planar clamping means 3.2, wherein alternative geometries, such as rounding, waveforms or ribs are possible. At the ends of the clamping means 3.2 are in accordance with the in Fig. 3 Punching grid 3 shown moldings provided which can support a latching of the locking means 2.4 of terminal contact 2.

The example of Fig. 4 Accordingly, the opening angle α of the clamping means 3.2 in the assembled state of terminal contact 2 is about 30 °. The angle β of the clamping means 3.2 facing sides of the ends of clamping section 2.3 is to form the largest possible contact area A accordingly about 30 °. In particular, by specifying the angle and the flexibility or rigidity of the clamping means 3.2 and the ends of the clamping portion 2.3, the contact areas A and clamping forces can be adapted to respective applications. For example, for a contact arrangement 1 which comprises four connection contacts 2, theoretically a total contact area of: $$4\cdot 4.3\mathrm{mm}\left(\mathrm{contact\; area}\mathrm{A}\right)\cdot 0.4\mathrm{mm}\left(\mathrm{thickness}\mathrm{<figure-callout\; id="2"\; label="einses\; contact\; terminal"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">einses\; </figure-callout>}\mathrm{contact\; terminal}2\right)\cdot 2\left(\mathrm{number}\mathrm{contacted}\mathrm{contact\; areas}\mathrm{A}\mathrm{Per}\mathrm{<figure-callout\; id="2"\; label="contact\; terminal"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">contact\; terminal</figure-callout>}2\right)=13.76{\mathrm{<figure-callout\; id="2"\; label="mm"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">mm</figure-callout>}}^2$$

The Fig. 5 shows the procedure for introducing terminal 2 in stamped grid 3, wherein in the unassembled state opening angle α of the clamping means 3.2 according to the example 50 ° and after the introduction of terminal contact 2 is 30 °. During the insertion of terminal 2, the clamping means 3.2 are opened by the ends or initially by the locking means 2.4 of clamping section 2.3 and guided by the engagement of the locking means 2.4 in the contacting position, which has a narrower opening angle α compared to the original opening angle. By the locking means 2.4 prevents terminal 2 can be pulled axially against the insertion direction of the clamp or pushed out by the clamping forces. An excessively deep insertion is prevented by the clamping forces and enclosure 4. Due to the fact that the latching means do not rest directly in the depression 4. 1 of the surround 4, the resulting freedom of movement advantageously makes it possible to tolerate vibrations. A removal of terminal contact 2 can be done for example by means of a dedicated tool, which the clamping means 3.2 of lead frame 3 via the locking means 2.4 of terminal contact. 2 spaced apart and may remain in this way during the removal of terminal contact 2. In the case of a misalignment of connection contact 2 in the direction of insertion, for example as a result of vibrations, an automatic repositioning takes place through the portion of the clamping forces directed counter to the direction of insertion. A generated by the contact assembly 1 electrical contact thus remains even with mechanical shocks.

In Fig. 6 a) and b) Alternative embodiments of contact arrangement 1, each with a plurality of grouped connection contacts 2 are shown. According to the embodiment of the Fig. 6 a) have only the outermost connection contacts 2 locking means 2.4. Alternatively, all terminal contacts 2 can have latching means 2.4, as in FIG Fig. 6b) represented, or it will be arranged terminal contacts 2 with and without locking means 2.4 in different ways from the variants shown.

Further preferred embodiments of the contact arrangement 1 according to the invention or of the connection contact 2 and punched grid 3 are in the FIGS. 7 . 8th and 9 shown. Bezel 4 is not shown in these figures, but may be provided in a comparable manner. By these embodiments, additional degrees of freedom are obtained, whereby in particular an increased compensation of tolerances during assembly and mechanical tolerances is possible and unintentional mechanical stresses on or caused by the contact arrangement 1 can be avoided. The assembly process can also be done at a different angle from the target angle. Tolerances can be correspondingly larger and thus costs can be saved. Also in the assembled state an adaptability is maintained, whereby the electrical contact is not affected by changing environmental conditions. The degrees of freedom also allow in the mounted state adjustable functional units, such as multimedia displays, which allow variable orientations.

Terminal contact 2 has according to the embodiments of Fig. 7 . 8th and 9 a clamping section 2.3, which is designed to be arcuate in the region of the contact surfaces 3.2 to be formed with the contact surface, as in Fig. 7 a) displayed. Accordingly, the clamping means are 3.2 of stamped grid 3 in the intended area for the contact area, in section, arcuate, as in the different perspectives and perspective sectional views of Fig. 7b) is shown. The shape of the surface of the clamping means 2.3 provided for the contact surface preferably corresponds to a spherical cap but may also assume different shapes.

The Fig. 8 shows a grouped terminal contact, which comprises a plurality of individual terminal contacts 2, as already for the embodiment of Fig. 6 has been described. The embodiment according to FIG. 8 is preferably designed in such a way that in connection with the lead frame 3, as in the FIGS. 7 and 9 shown results in a substantially globoidale contact surface A.

Fig. 9 shows in the sub-figures a), b) and c) according to this embodiment of contact arrangement 1 present degrees of freedom on the example of a grouped terminal, which is composed of a plurality of individual terminals 2, wherein by the clamping forces of the clamping means 3.2 and / or the clamping section 2.3 a automatic resetting of the grouped connection contact in a desired position, as for the embodiments already described, can be realized. By way of example, possible angular degrees of freedom are shown in the subfigures. The subfigure a) of Fig. 9 show a tilt of terminal 2 with respect to the desired position in a direction parallel to the terminal 2 and with respect to lead frame 3 level by an angle of about 2 °. In Fig. 9b) is a slope of terminal 2 by about 6 ° in a direction of the terminal 2 and the lead frame 3 vertical plane and in Fig. 9c) is shown a rotation of terminal 2 relative to punched grid 3 in a lead frame 3 parallel and terminal 2 vertical plane. The shown deviations from the desired position can also occur together.

Further preferred embodiments of the contact arrangement 1 according to the invention or of the connection contact 2 and punched grid 3 are in the FIGS. 10 to 13 shown. By means of this embodiment, in particular the freedom of movement parallel to the insertion direction can be further increased, whereby an improvement of the compensation of vibrations or mechanical shocks can be achieved. In addition, a direct electrical contact with a circuit board is possible.

In the sub-figure a) of Fig. 10 is terminal contact 2 and in the partial figure b) lead frame 3 shown in different perspective views. In contrast to the previously described embodiments, terminal contact 2 has a substantially tweezer-shaped main body, which also has two clamping springs 2.1 with an intermediate slot 2.2 and a clamping section 2.3, wherein the clamping springs 2.1 in a clamping section 2.3 remote from the part of the terminal 2 integral with each other and , as in Fig. 12 imaged, for example, in a plug-in opening of a circuit board 5 are designed for insertion. Thus, the terminal contact 2 can be manufactured in a cost effective manner, for example, from a formed punched strip. In the area of connection contact 2 inserted in the printed circuit board 5, the latter preferably has corresponding formations 2.6 for fixing within the circuit board opening and avoiding abrasion particles. Alternatively, it is also possible to dispense with such shaping. Clamping section 2.3 has a substantially diamond-shaped form, wherein this merges on the one hand in the clamping springs 2.1 with a corresponding slot opening and on the opposite side is not one piece into each other. The clamping section 2.3 preferably comprises the locking means 2.4, which are realized according to this example as wells and provided for locking the clamping means 3.2, as in the Fig. 11 is shown on the assembled state of the contact arrangement 1. It may alternatively be provided deviating latching formations. The clamping means 3.2 of lead frame 3 have according to this embodiment, planar surfaces, wherein angle α in the unassembled state example, is about 70 °. The clamping means 3.2 are preferably bent in particular for the realization of a defined contact surface A and improved mechanical fixation at the ends. By this deformation, the contact surface A can be adjusted or increased. Alternatively, this transformation can be implemented in another way or completely dispensed with.

On the basis of in the FIGS. 13 and 14 shown positions of terminal 2 relative to stamped grid 3, the assembly process of contact assembly 1 will be described below. When inserting terminal 2 in opening 3.1 is carried out according to position I. a first contact of the terminal 2 and the clamping means 3.2, which act through the clamping section 2.3 and / or the clamping means 3.2 is not caused by the elastic deformation of restoring forces. Upon further insertion of terminal 2 in the negative z-direction, the clamping means 3.2 are opened by clamping section 2.3 until reaching the widest point of this angle α so smaller. In the course of this process, clamping section 2.3 touches the bottom of the enclosure 4, whereby, upon further application of force to connection contact 2 in the negative z-direction, the diamond-shaped basic shape is compressed and its widest point widened accordingly. After passing through this widest point by the clamping means 3.2, these move back in the direction of the relaxed position due to the restoring forces and the angle α is again larger (Pos. II.). Subsequently, by a further movement in the negative z-direction and thus compression of clamping section 2.3, a locking of the clamping means 3.2 in the wells 2.4 of terminal 2 can be effected, as in position III. is shown. In this position, the angle α corresponds to that in the unmounted state.

Does not apply now acting in the negative z-direction press-in force, the elastic restoring forces of the compressed clamping section 2.3 act in the positive z-direction, through the latching in the recesses 2.7 clamping means 3.2, which are thus elastically deformed in the positive z-direction, whereby angle α is increased, further movement is prevented when the restoring forces of the clamping means 3.2 and the clamping portion 2.3 are in balance. The position IV thus achieved represents the desired position of terminal contact 2 with respect to leadframe 3 or the desired contacting position. The terminal contact 2 movably fixing in this position results in clamping forces Restoring forces, which also act in such a way that an automatic repositioning can be done in the desired position, if mechanical shocks or vibrations occur. A further movement of the terminal 2 in the negative z-direction, in particular when introduced into opening 3.1 of lead frame 3 is prevented by the closed end of recess 4.1 of enclosure 4, as in for Pos. V of FIG. 13 shown.

The Fig. 14 shows an exemplary force-displacement diagram of the contact arrangement 1 using the example of the embodiment according to FIG Fig. 11 , Starting from the nominal position of terminal contact 2 at the intersection of the axis of the deflection in the z-direction (ordinate) and the axis of the applied force F (abscissa), with further pressing of terminal 2 in recess 4.1 (neg. Z-direction) is a growing Force applied against the resilient clamping sections 2.3 of terminal 2.3, as shown in position V. of Fig. 13 is also comprehensible. When force is applied to connection contact 2 in the positive z-direction, there is also an increasing force counteracting the removal, so that at least one automatic fall-out is prevented.

Based on FIGS. 15 and 16 the method according to the invention for the realization of the enclosure 4 will be described below, which for the mechanical fixation of contact arrangement 1 and for example for the separation of work areas of different purity classes within an electronic device. This can be, for example, the separation of a region of supply electronics from a region of an electrical consumer. The supply electronics are expediently located in an area of a housing which is at least partially separated by the enclosure the electronic device - in particular a motor vehicle - and the electrical consumer in another area of the housing or the electronic device. Fig. 15 shows various sectional views of an embodiment of the injection molding, wherein the sake of clarity - except for molding 10 - was dispensed with the representation of the injection molding tool.

According to the method, lead frame 3 for the realization of enclosure 4 expediently molded by means of a suitable material, for example plastic, in an injection molding process, wherein at least one molding 10 is provided for generating recess 4.1, which in the preferred by means of a preceding process step, eg a punching process , generated opening 3.1 is introduced. In this process, the clamping means 3.2 are brought in accordance with the embodiment described by molding 10 in an elastically deformed and. With respect to the fixed angle α for the unassembled state reversible deflection of about 90 °. Preferably, the present clamping forces of the clamping means 3.2 fix on molding 10 punched grid 3 during the injection molding process in this position. Shaped part 10 preferably projects beyond the ends of the clamping means 3.2, which later in particular the engagement of the locking means 2.4 and 2.3 of the clamping portion can be made possible. Subsequently, the injection molding material is injected into the injection mold. After cooling of the enclosure 4, the injection mold and molding 10 can be removed, the clamping means 3.2 take the original deflection again. A production of other injection molded parts for the separation of the work areas is thus not necessary in an advantageous manner. A preferred embodiment of molded part 10 is shown in FIG Fig. 16 shown. According to this example, a plurality of spacers 10.1 for resting on stamped grid. 3 provided by means of which the relative position of the molded part 10 to stamped grid 3 and the thickness of the stamped grid 3 covering material can be specified in an improved manner. Spacers (not shown) can also be provided on the opposite side of the stamped grid, whereby positioning of the stamped grid in the injection-molding tool can be further improved, and thus, in particular, the resulting wall thicknesses of the border 4 have smaller tolerances. For example, can be achieved by a greater distance of the spacer 10.1 improved parallel alignment of the molding 10 to stamped grid. In order to provide in the region of stamped grid 3 facing away from the depression 4.1, at the transition to the part of the molding 10 to be introduced in the opening 3.1, an area not enclosed by the enclosure 4 is provided, corresponding to that in FIG FIGS. 15 and 16 illustrated example of the molding 10, base 10.2 provided.

At the contact surface of the clamping means 3.2 to enclosure 4, it may come to adhesion forces following the removal of molding 10 and as a result, to adhere to the clamping means 3.2 and a breaking out of particles of enclosure 4. This can expediently be avoided by appropriate preparation of the clamping means 3.2 with an adhesion-reducing agent, so-called mold release agent. Likewise, an optimization of the parameters, such as the materials and / or geometries, enables a reduction or avoidance of the adhesion forces.

For example, results for the described embodiment, when using CUSn015 as a material for the stamped grid. The force exerted by the clamping means 3.2 force can be influenced in particular by the radius in the transition to the rest of the lead frame 3 become. According to an exemplary embodiment of the method, the force for fixing the position of the punched grid 3 relative to the molded part 10 is approximately 370 N. The contact pressure per clamping means on the molded part 10 caused by the elastic restoring forces of the clamping means 3.2 is thus 370 N / 33 mm ² (11 MPa or 110 bar), wherein the 33 mm ² correspond to an exemplary surface of a clamping means.

As a result of this contact pressure of the clamping means 3.2 on the molded part 10, an injection of injection-molding material between them is avoided during the injection. To increase this pressure are preferred points for injecting the injection molding material perpendicular to the surfaces of the deflected at 90 ° clamping means 3.2, as in Fig. 15 are represented by triangles, whereby the contact pressure can thus be changed by the injection pressure in the course of injection molding. Using Ultradur B4030 G6 (BASF PBT GF30) as the injection molding material, an injection pressure in the range between about 250 bar to about 1800 bar, in particular 253 bar, is preferably used for the described arrangement of the injection points. The differential pressure between the injection side and the molded part side is thus exemplarily 253 bar - 1 bar (atmospheric pressure). In sum, with the above-calculated contact pressure of 110 bar, which are caused by the elastic restoring forces, one obtains during the injection a total pressure of about 362 bar at each clamping means 3.2, which corresponds to a force of about 1217 kN.

Claims (9)

1. Electronic device comprising a contact assembly (1) for making electric contact, wherein the contact assembly has at least one punched grid (3) and a connecting contact (2) for making electric contact with the contact assembly (1), wherein the punched grid (3) has an opening (3.1) for the insertion of the connecting contact (2) and clamping means (3.2) projecting out of an opening plane, wherein a clamping section (2.3) of the connecting contact (2) can be inserted at least partly into the opening (3.1) and fixed mechanically by the clamping means (3.2), forming an electrically conductive contact surface (A),
   characterized in that
   the clamping section (2.3) has latching means (2.4) which can be latched in on the clamping means (3.2) in such a way that a movement of the connecting contact (2) counter to an insertion direction of the connecting contact (2) is prevented, wherein the punched grid (3) is enclosed by means of an enclosure (4) of the device, wherein the enclosure has a recess (4.1) for the at least partial accommodation of the clamping means (3.2) and the clamping section (2.3) .
2. Electronic device according to Claim 1, characterized in that the clamping means (3.2) are arranged opposite each other in such a way that the result is opposite directions of action of the elastic restoring forces.
3. Electronic device according to one of the preceding claims, characterized in that the clamping section (2.3) has at least two surfaces aligned opposite each other at an opening angle (β) for connection to the clamping means (3.2) of the punched grid (3) and forming an electrically conductive connection.
4. Electronic device according to one of the preceding claims, characterized in that the clamping means (3.2) are arranged opposite each other with an opening angle (α) relative to each other which, in order to form the elastic restoring forces of the clamping means (3.2), has a lower value when the connecting contact (2) is inserted than when a connecting contact (2) is not inserted.
5. Electronic device according to one of the preceding claims, characterized in that the connecting contact (2) is designed to receive a blade contact which has two contact springs (2.1) spaced apart by an insertion slot (2.2), which are connected to each other in one piece in a clamping section (2.3), or in that the connecting contact (2) is designed to be pressed into a contact-making opening.
6. Electronic device according to one of the preceding claims, characterized in that the clamping means (3.2) are reshaped constituent parts of the punched grid (3) and integral with the latter.
7. Electronic device according to one of the preceding claims, characterized in that the clamping section (2.3) is flat or arcuate in regions for forming the contact surfaces.
8. Electronic device according to one of the preceding claims, characterized in that the enclosure (4) separates different working regions within the electronic device, in particular a region of supply electronics from a region of an electronic consumer.
9. Method for producing a device according to Claim 1, wherein the following steps are carried out in the method:

   - introducing a moulding (10) at least partly into the opening (3.1) of the punched grid (3) to form a recess (4.1) at least partly accommodating the contact assembly (1),

   - deflecting the clamping means (3.2) enclosed by the punched grid (3) by means of the moulding (10) in the introduction direction, wherein, because of its elastic restoring forces, a clamping force is exerted on the moulding (10) in such a way that the punched grid (3) is mechanically fixed with respect to the moulding (10), and then

   - injecting an injection-moulding material into an injection mould at least partly enclosing the punched grid (3).

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