EP1573862B1 - Electrical terminal connection, especially for connecting an outer conductor of a coaxial cable - Google Patents

Abstract

The termination connection has a plug element (1) with a plug part (111) and a sleeve attachment (111d), for reception of the outer conductor (19a) of the coaxial cable (19), fitting into an opening (3) in a housing wall (7), for providing an electrical connection with the latter. The plug part has 2 axially offset plug sections (111a,111b), the opening having 2 axially offset reception sections (211a,211b) of slightly lesser size.

Description

The invention relates to an electrical connection connection, in particular for the connection of an outer conductor of a coaxial cable according to the preamble of claim 1.

Electrical connection connections, in particular for the connection of an outer conductor of a coaxial cable, regularly consist of a plug-in element which can be plugged into a socket or generally into a coupling with a corresponding plug receiving opening.

Such coupling devices may for example also be formed on an electrically conductive metal part, a plate, a wall, ie generally a housing part or an electrically conductive housing, to which, for example, an electrical coaxial cable to be connected. The inner conductor is insulated from the outer conductor and is thereby inserted into an inner conductor coupling part. The provided with a corresponding outer conductor sleeve coaxial contacted while sleeve-shaped part of the coupling device in order to produce an electrical connection from the outer conductor of the coaxial cable to the plug element and, as a rule, to a housing or housing part.

When using flexible coaxial cables, which are known to be unable to absorb large bending moments or radial forces, but then come on various problems. On the one hand, a frictional connection of the outer conductor, for example, with an electrical housing without the use of additional parts can not be realized.

Therefore, e.g. has already been proposed according to US 2001/0053633 A1, to press a plug-in element in a receiving opening of a metallic wall. For this purpose, usually the end of a coaxial conductor is stripped accordingly, i. Also, the outer conductor stripped over a certain Axialmaß to put on an adapter part, which is formed in the form of a metal sleeve. The space between the inner wall of the sleeve-shaped adapter part and the Koaxialkabelaußenleiters is electrically connected by soldering. This adapter part is then pressed non-positively into a bore, which is for example formed on an electrically conductive housing, housing part, an intermediate wall, etc. The inner conductor can then protrude inward through the corresponding bore in the housing wall part and be electrically connected there by customary means.

If castings are used in such press-fit connections, press-fit sleeves with a corresponding external knurling must be used due to large tolerances. The sleeves each have a radially projecting and circumferential ring, which rests in the pressed-in position on the outside of the electrical wall to be contacted or the stop, etc. However, since this stop surface can never rest evenly (due to unevenness of the corresponding stop wall, misalignment of Einpresstempels etc.), there are no clear, unambiguous and always reproducible electrical contact conditions, combined with all the resulting disadvantages. There is also the risk of relaxation through relaxation and thermal cycling.

In DE 73 35 171 U a device for connecting an outer conductor and the strain relief of a coaxial cable is described, it can not be clearly seen from the drawings, whether the plug element is inserted into a receiving opening only or even pressed.

Finally, however, electrical connecting devices are also known, in particular for coaxial cables, in which a contact sleeve is placed on the coaxial cable at the plug end over a certain axial length on a stripped outer conductor region, which then interacts with a union nut to generate axial forces. The union nut can be turned on a corresponding thread approach, which is formed for example on the housing wall to be contacted. However, since the union nut can also have a minimum radial clearance, although radially inwardly in the region in which the outer conductor jacket of the coaxial cable is inserted, undefined electrical contacts also result here.

From DE 198 24 808 C1 discloses a holder for elongated body with an electrical shielding known, said known holder has two mutually offset receiving portions, which are associated with at least two offset in the insertion direction mating plug sections. The arrangement of the plug-in element in the receiving opening takes place by pressing the plug-in element into the receiving opening.

From DE 20 22 318 B2 can also be a tubular mounting element in the manner of an electrical connection connection for high-frequency-tight insertion and mounting of components of a radio interference suppression in shielding walls as known to remove, which comprises a plug-in element which cooperates with a receiving opening formed in a housing wall. This plug-in element has at least two offset plug-in and axial plug-in sections, which have different diameters and are separated from each other in the axial direction by a circumferential groove. The plug portion with the larger diameter has a knurling on its peripheral surface. To produce the electrical connection, the plug element is pressed into the corresponding receiving opening of the housing wall. In the press-in process, a material displacement of the housing wall takes place in the groove of the plug-in element, whereby an axial fixation of the plug-in element in the housing wall is effected. Furthermore, a penetration of the knurling in the housing wall is noted, whereby a rotational fixation (rotation) of the plug element in the housing wall is made possible.

Finally, EP 1 087 466 A2 describes a sleeve-shaped connection connector with a plug-in element, which cooperates with a receiving opening, which is introduced into a housing wall. The plug-in element has there also on its peripheral surface a knurling.

For the sake of completeness, it should also be mentioned that, of course, outer conductors of flexible coaxial cables can also be electrically connected to a housing by soldering. Basically, this is a good electrical connection produced. However, it should be noted that surfaces of cast housings are not solderable. This would first require that the castings be galvanized. On the one hand, this would lead to a considerable increase in costs. On the other hand quality problems occur with complicated contours with a uniform layer thickness. In addition, large amounts of heat during soldering are required, which would lead to high thermal loads on the housing and the cable.

If the described electrical connection devices are provided in an electromagnetic field (for example an antenna), additional, hitherto unknown problems result. Because in this case, not only the on the inside of Koaxialkabelaußenleiters always detectable current flow is present, but due to the electromagnetic field also takes place on the outside of the outer conductor, a current flow instead.

Now, if one of the above-mentioned, known in the prior art electrical connection means selected, it has the consequence that although the current flowing on the inside of the outer conductor defined current to Can flow inside the coupling element, but not the current flowing on the outside of the outer conductor current to the outside of the coupling element. Due to mechanical or thermal loads, vibrations and settling phenomena, the contact conditions change and interference signals occur.

Object of the present invention is therefore to provide an improved electrical connection connection, in which clearly defined and always clearly reproducible electrical contact conditions can be produced both between the inside of Koaxialkabelaußenleiters and housing and between the outside of Koaxialkabelaußenleiters and housing, and especially even if the electrical connection connection is in an electric field.

The object is achieved according to the features specified in claim 1.

Advantageous embodiments of the invention are specified in the subclaims.

The improved electrical connection connection is characterized in that both the hereinafter partially also as a plug-in element 1 designated plug connection element as well as the associated hereinafter partially also referred to as a receiving opening coupling element, in which the plug element can be inserted, in the axial direction of insertion at least two stages. The plug element, viewed in the insertion direction, has a first plug-in section and, in the axial direction thereafter, at least one (preferably spaced apart) second plug portion, which has a radially larger transverse extent than the first radial plug portion at least in partial circumferential regions. Also in two stages and cooperating the coupling device is designed. In this case, the plug-in sections of the plug-in element are provided on their outer circumference with corresponding engagement elevations, that is to say a kind of knurl, which has a radial or outer or spacing dimension before production of the plug connection which is at least slightly larger than the corresponding dimensions of the receiving opening. Thus, an inner and an outer engagement zone are formed by intermeshing, namely an inner engagement zone interacting in the plug-in direction smaller dimensioned plug-in portion which cooperates with a first and / or further inside and at least with a correspondingly matched, slightly smaller-sized coupling opening, wherein the trailing in the insertion direction larger sized plug portion cooperates with a correspondingly slightly larger sized portion in the receiving opening (coupling means). Through the inner press-in zone, an optimal contact between outer conductor inner side and the inner side of the coupling is produced, which can for example also simultaneously represent the inside of a housing part or a housing. Through the outer press-in zone, an optimal contact between the outer conductor outside and the outer side of the clutch is produced, that is, for example, again a housing outside. As a result, in contrast to the prior art always two unique and optimal electrical contact connections between plug-in device and coupling device, ie between plug-in element and receiving opening realized.

Preferably, a sleeve-shaped plug element made of a material which is harder than the material of the coupling device is used, i. For example, the material of a plate to be contacted, wall, housing wall or generally a housing, etc., wherein the receiving opening is introduced for receiving the plug-in element. Preferably, however, the material of the sleeve-shaped plug-in element should have the same or at least similar large thermal expansion coefficient as the material of the coupling device.

Preferably, an axial knurling or a Kreuzrändelung is provided. The knurled teeth can be formed pointed, wherein they are preferably provided at its leading end with insertion bevels. These serve to prevent the formation of chips during the press connection process.

The entire mode of action is preferably such that the knurling tips of the plug-in connection element engage in the housing material of the cooperating and generally sleeve-shaped coupling element. This results in an elastic and plastic deformation of the corresponding material. This in turn results in an excellent frictional connection. As a result of the elastic deformation component, the described connection can thus also be used in the case of thermal cycling loads and it is not necessary to form a positive securing of the position of the plug-in element.

Preferably, the entire system can be tuned so that both outer knurls simultaneously contact corresponding material holes in the coupling device. This facilitates the centering and alignment of the sleeve prior to pressing.

In principle, however, the system is also tunable such that, for example, first the leading press-in section of the electrical plug connection elements in the corresponding receiving portion in the coupling element and then only after a, albeit small axial Einpressbewegung the subsequent second press-in with the outer larger-sized receiving portion of the coupling device in Contact device or vice versa.

The inventively significantly improved defined contact situations both in the inner and on the outer connector region result from the fact that the number of contacts is equal to the number of Rändelspitzen. The contacts are preferably evenly distributed around the circumference. In addition, gas-tight, metallic end contacts can be realized, as are destroyed by the sliding movement during pressing oxide layers and at the same time takes place a self-cleaning process.

In one embodiment of the invention can be provided that acting as a stop portion between the smaller dimensioned leading plug-in portion and the subsequent, equipped with a larger diameter plug-in portion of a correspondingly shaped stopper portion strikes in the coupling device which lies in the interior of the coupling device. If the coupling device is formed, for example, in an electrically conductive housing wall, then the inner stop lies in the inner portion of the housing wall. This results in optimal mounting conditions, since the press-fit process can be easily terminated by a force limit. Finally, this also higher bending loads of preferably sleeve-shaped plug-in connection elements are possible. By realized in the interior of the clutch stop limit and no dirt particles can penetrate into the housing or in the coupling device.

Due to this design, the diameter of a press-fit stamp used can be the same size or even smaller than the diameter of the preferably sleeve-shaped plug-in connection device. Because the axial feed movement is limited by the mentioned step stop. This ensures that the coupling device or the housing is not partially pressed during the pressing process and impressions of the stamp are visible after the assembly process.

Finally, the axial length of the preferably sleeve-shaped and subsequently also partially referred to as plug-in connector plug element is dimensioned so that the height of the press-in portion of the height or axial length of the coupling device corresponds, which has particular advantages when the coupling device part of a plate to be contacted or. Housing wall is. Because high-frequency alternating currents flow due to the skin effect on the surface of conductors, Thus, an optimal flow of current to the inside and outside of the housing wall equipped with the receiving opening or the like is realized.

It also proves to be advantageous if an at least small circumferential groove is provided between the two press-in sections on the electrical plug connection element. As a result, for example, the knurled structure can be cut cleanly in the outer peripheral areas of the two press-in sections. As a result, it is also possible to produce a clearly and clearly defined step-shaped stop surface between the press-in sections.

Finally, even over the larger-sized press-fit portion of the plug-in element, a shoulder may be formed, which prevents the solder from flowing to the two pressing surfaces when the cable is soldered to the preferably sleeve-shaped plug-in connection device.

Of course, the sleeve-shaped plug element can be soldered before being pressed into the coupling device with the outer conductor of a coaxial cable. In the same way, however, a press-fitting process into the coupling device is only possible in order subsequently to solder the electrical conductor, in particular the outer conductor of a coaxial cable, in a second step.

The multi-stage connection device according to the invention can be used particularly advantageously if the coupling element is to be produced by casting and must be provided with draft angles.

Figur 1:

eine schematische Querschnittsdarstellung durch ein erstes erfindungsgemäßes Ausführungsbeispiel mit einem hülsenförmigen Steckelement (aufgesetzt auf einen abisolierten Abschnitt eines Außenleiters eines Koaxialkabels) und einer in einer Gehäusewandung ausgebildeten Aufnahmeöffnung (Kupplungseinrichtung) vor dem Pressverbinden;

Figur 2:

eine schematische perspektivische Darstellung einer bevorzugten Ausführungsform eines hülsenförmigen Steckelementes;

Figur 3:

eine entsprechende schematische perspektivische Darstellung des in Figur 2 wiedergegebenen hülsenförmigen Steckelementes, jedoch von eher rückwärtiger Seite her betrachtet;

Figur 4:

eine weitere perspektivische Darstellung, jedoch gegenüber Figur 3 unter stärker rückwärtigem Betrachtungswinkel;

Figur 5:

eine zu Figur 1 entsprechende.Darstellung nach Beenden der.Pressverbindung;

Figur. 6:

ein abgewandeltes Ausführungsbeispiel zu Figur 5, bei welchem die Aufnahmeöffnung (Kupplungseinrichtung) an einem verdickten Gehäuseabschnitt ausgebildet ist;

Figur 7:

ein zu Figur 1 bis 5 abgewandeltes Ausführungsbeispiel, bei welchem das zweistufige Steckelement von der entgegengesetzten Seite her in die an der Gehäusewandung ausgebildeten Aufnahmeöffnung (Kupplungseinrichtung) einführbar ist;

Figur 8:

ein zu Figur 1 bis 5 abgewandeltes Ausführungsbeispiel, bei welchem das Steckelement mit seinem zweistufigen Pressansatz nicht von einer Axialbohrung zur Aufnahme einer elektrischen Anschlussleitung, insbesondere koaxialen Anschlussleitung durchsetzt ist, sondern mit einer senkrecht dazu verlaufenden Aufnahmebohrung in einem Aufnahmeabschnitt;

Figur 9:

eine zu Figur 8 entsprechende Darstellung aber eher auf die Vorderseite des hülsenförmigen Steckelementes gerichtet;

Figur 10:

eine perspektivische Darstellung eines abgewandelten Ausführungsbeispiels mit eher rechteckförmiger Grundgestaltung; und

Figur 11:

eine entsprechende Darstellung zu Figur 10 in perspektivischer Wiedergabe, jedoch eher von der rückwärtigen Seite betrachtet.

The invention will be explained in more detail with reference to embodiments. Showing:

FIG. 1:

a schematic cross-sectional view through a first embodiment according to the invention with a sleeve-shaped plug-in element (mounted on a stripped portion of an outer conductor of a coaxial cable) and formed in a housing wall receiving opening (coupling means) before the press connection;

FIG. 2:

a schematic perspective view of a preferred embodiment of a sleeve-shaped plug-in element;

FIG. 3:

a corresponding schematic perspective view of the reproduced in Figure 2 sleeve-shaped plug element, but viewed from the rear side;

FIG. 4:

a further perspective view, but with respect to Figure 3 at a greater rearward viewing angle;

FIG. 5:

a representation corresponding to FIG. 1 after terminating the press connection;

Figure. 6:

a modified embodiment of Figure 5, wherein the receiving opening (Coupling device) is formed on a thickened housing portion;

FIG. 7:

a modified to Figure 1 to 5 embodiment in which the two-stage plug-in element from the opposite side into the formed on the housing wall receiving opening (coupling means) can be inserted;

FIG. 8:

a modified to Figure 1 to 5 embodiment in which the plug-in element is not penetrated by an axial bore for receiving an electrical connection line, in particular coaxial connection line with its two-stage pressing approach, but with a perpendicular thereto receiving bore in a receiving portion;

FIG. 9:

an illustration corresponding to Figure 8 but rather directed to the front of the sleeve-shaped plug-in element;

FIG. 10:

a perspective view of a modified embodiment with a more rectangular basic design; and

FIG. 11:

a corresponding representation of Figure 10 in perspective view, but viewed from the rear side.

Hereinafter, a first embodiment will be described with reference to FIGS.

FIG. 1 shows, in a schematic cross-section, a coaxial connection which comprises, on the one hand, a plug-in element 1 and, on the other hand, a coupling device 3 which, in the embodiment shown, is in the form of a two-step bore in a wall 7, i. an electrically conductive housing wall 7 or part of a housing forming wall 7 is formed.

The plug-in element 1 is sleeve-shaped and has an actual plug-in insert 111 which comprises a leading plug-in section 111a and a second plug-in section 111b following in the plugging direction. Both plug portions 111a and 111b are provided offset in the insertion direction, ie in the axial direction by the width of an annular groove 111c to each other. The annular groove 111c has a smaller diameter than the two outer diameters of the plug-in inserts 111a and 111b.

It can be seen from the illustration according to FIGS. 1 to 5 that the plug-in element 1 is still formed on the rear side 1a, which is in the direction of insertion, with an axially elongated sleeve projection 111d.

The plug-in element 1 has an inner bore 17, which is at least slightly larger than the outer diameter of a stripped outer conductor 19a of a coaxial cable 19. The axial length of the inner bore 17 passes through almost the entire axial length of the plug-in element 1 with Rückbelassung a stop shoulder 21 with a bore 23. with slightly smaller diameter than the inner bore 17. This stop shoulder 21 with the thus formed annular projection 21a is thus formed on the forward insertion direction 1b in the insertion direction. As a result, the coaxial cable 19, stripped down to the outer conductor 19a, can be inserted into the plug-in element 1 as far as it will go against the stop shoulder 21. Before the further connection with the receiving opening 3 or after the connection to the coupling device 3, a soldering process can then be carried out in order to electrically connect the outer conductor 19a to the electrically conductive plug element 1 by means of the solder 25. The corresponding inner conductor 19b ultimately penetrates the plug-in element 1 in a suitable length, as shown for example in FIG. It can also be seen from the drawings that the bore 23 is dimensioned to be large enough for the inner conductor 19b of the coaxial cable 19 to be passed and plugged without any electrical contact between the inner conductor and the plug element 3 in the finally positioned state.

As can also be seen from FIGS. 2 to 4, the plug-in section 111a located in the plug-in direction has a smaller outer diameter than the second plug-in section 111b following in the plug-in direction. Both plug-in sections are provided on their outer circumference with a knurling 27, for example, an axial knurling or a Kreuzrändelung etc., the outer diameter before connection with the coupling device 3 is at least slightly larger than the corresponding inner diameter of the below-mentioned coupling device. 3

As can be seen from the embodiment of Figure 1, which is in this case in the form of an electrical Housing wall 7 incorporated coupling device 3 also formed in two stages and has a first receiving portion 211a with a smaller diameter and a second axial offset to the second receiving portion 211b with a larger diameter. The two diameters or the two shapes and sizes of the receiving plug portions 211a and 211b are basically adapted to the shape and size of the two likewise offset plug portions 111a and 111b and only differ in that the outer periphery of the plug lugs by the knurling introduced there 27 prior to insertion into the receiving opening 3 (coupling device) is slightly larger than the respectively associated receiving portions 211a and 211b. However, the core diameter of the provided with a knurl plug-in sections are smaller than the corresponding inner diameter of the receiving opening 3, so that contact after pressing only the knurling tips and only low joining forces are necessary even at great excess. The introduction of the circumferential annular groove 111c results in production-related advantages in the production of the knurling 27 formed on the outer circumference. In the feed direction, the respective knurling 27 is provided with a flattening 29 in each case in order to prevent chip formation during assembly. The forwardly facing in the insertion direction surface 31 of the larger sized plug portion 111b serves simultaneously as a stop surface or stop shoulder 31 which is formed on a corresponding stop surface or stop shoulder 33 in the transition from the smaller dimensioned to the larger-sized receiving portion 211a and 211b of the receiving opening 3.

To prepare the solid compound is then over a suitable pressing tool (which can be dimensioned smaller than the diameter of the larger sized plug portion 111b) the plug element 1 pressed into the partly also referred to as coupling element 3 receiving opening 3, the outer protruding teeth of the knurls 27 are now notched into the material of the housing wall 7 , The sliding movement destroys possible oxide layers and a self-cleaning effect occurs, which ensures an electrically perfect optimum contact.

The two-stage contact mechanism ensures that currents from both the inside and the outside of the coaxial cable outer conductor - especially when it is in an electromagnetic field - clearly defined to the housing wall 7 can flow back and forth, namely both over the contact area A. between the leading plug portion 111a in interaction with the receiving portion 211a as well as further by the further interaction in the contact area B between the plug-in direction trailing second plug portion 111b and the receiving portion 211b.

The respectively clearly defined electrical contact zones are marked with A and B in FIG.

Of course, a plurality of inner holes 17 for receiving coaxial cables can be provided on the plug-in element 1.

The embodiment according to FIG. 6 differs from the previous one only in that the wall section 7 is provided in the region of the receiving opening 3 with respect to the remaining housing or wall sections 7 with a material thickening 7 '.

Based on the embodiment 7 is merely shown that the arrangement of the axially offset plug portions 111a and 111b and the associated receiving portions 211a and 211b of the receiving opening 3 can also be formed inversely to the embodiment of Figure 1 and 5. In the embodiment according to FIG. 7, the plug-in element 1 is inserted from the inside of the housing into the corresponding recess. In this case, the solder connections between the plug-in element 1 and the coaxial cable can be produced after the press connection between plug-in element 1 and coupling device 3 has already been made. In this case, the cable must be passed through the coupling opening 211 before being pressed in.

In the embodiment according to FIG. 8, it is shown that the plug-in element 1 does not have to be sleeve-shaped, but rather that the corresponding inner bore 17 can also be formed transversely to the axial direction of the plug-in projections 111a and 111b in a rearward section 111f of the plug-in element 1 to form a stop shoulder 21 , It is also possible to provide knurls at both ends of the plug-in element and to contact with this plug-in element simultaneously 2 parallel housing walls.

FIGS. 10 and 11 further show that the plug-in element 1 does not necessarily have to approximate in an axial view of the circular shape. They are also elliptical Shapes, rectangular shapes or general n-polygonal or other basic shapes conceivable. Accordingly, the receiving portions 211a and 211b of the coupling device 3 would then have to be designed. Also in this embodiment, it is such that the considered in the axial or insertion direction peripheral contour or cross-sectional area or the cross-sectional size of the leading in the insertion direction plug-in projection 111a is preferably smaller overall than the cross-sectional sizes of downstream in the insertion direction second plug-in projection 111b. Under certain circumstances, however, would also be sufficient if at least in a cross-sectional extension of the leading plug portion 111a is dimensioned smaller than the trailing plug portion 111b. In addition, the cross-sectional shapes of the two plug sections may be different, for example, the leading plug section be designed rectangular, comparable to Figure 10, wherein the larger sized trailing plug-in portion, for example, again has a circular cross-sectional shape.

It also follows from the drawings that the respective axial height of the plug-in sections coincides with the axial heights of the receiving sections of the coupling device. As a result, in each case the leading in the direction of insertion boundary surface arranged with the outside in the insertion direction trailing boundary surface in alignment with the inside and outside housing wall sections.

Claims (17)

1. An electrical terminal connection, especially for connecting an outer conductor (19a) of a coaxial cable (19),
   having a plug-in element (1), which has a plug-in section (111) and a sleeve attachment (111d) for the purpose of accommodating and connecting an electrical conductor, and
   having an accommodating opening (3), which interacts with the plug-in element (1) and is formed in a housing wall (7),
   the plug-in element (1) being pressed into the accommodating opening (3) for the purpose of making the electrical connection to the housing wall (7),
   characterized
   in that the electrical terminal connection is designed to have two stages,
   in that the plug-in element (1) has at least two plug-in sections (111a, 111b) which are formed such that they are offset in the plug-in and axial direction,
   both the plug-in section (111a) which leads in the plug-in direction and the plug-in section (111b) which lags in the plug-in direction being provided with a knurl (27) on their outer circumference,
   in that the accommodating opening (3) has a first and a second accommodating section (211a, 211b) which lie such that they are offset in the plug-in and axial direction of the plug-in element (1), and
   in that the two plug-in sections (111a, 111b) and the two accommodating sections (211a, 211b), complementary thereto, are designed to have differing cross-sectional sizes, the radial or outer dimension of the plug-in sections (111a, 111b), which are provided with the knurl (27), being slightly greater than the radial or inner dimension of the accommodating sections (211a, 211b) respectively interacting therewith.
2. The terminal connection as claimed in claim 1, characterized in that the cross-sectional size of the leading plug-in section (111a) is smaller than the cross-sectional size of the lagging plug-in section (111b), at least in a partial circumferential region and transverse to the plug-in direction of the plug-in element (1).
3. The terminal connection as claimed in claim 1, characterized in that the cross-sectional size of the leading plug-in section (111a) is smaller than the cross-sectional size of the lagging plug-in section (111b) in the entire circumferential region and transverse to the plug-in direction of the plug-in element (1).
4. The terminal connection as claimed in claim 2, characterized in that the first accommodating section (211a) of the accommodating opening (3) is smaller than the offset, second accommodating section (211b), at least in a partial circumferential region corresponding to the partial circumferential region of the plug-in section (111a) interacting therewith.
5. The terminal connection as claimed in claim 3, characterized in that the first accommodating section (211a) of the accommodating opening (3) is smaller than the offset, second accommodating section (211b) in the entire circumferential region corresponding to the circumferential region of the plug-in section (111a) interacting therewith.
6. The terminal connection as claimed in claim 1, characterized in that the inner surfaces of the accommodating sections (211a, 211b) of the accommodating opening (3) are designed to have no knurls.
7. The terminal connection as claimed in claim 1, characterized in that, of the outer circumferential surfaces of a plug-in section (111a, 111b) which each interact in pairs and the inner surface of the associated accommodating section (211a, 211b) of the accommodating opening (3), in each case only one section is formed with a knurl (27) and the other surface interacting therewith is formed without a knurl.
8. The terminal connection as claimed in one of claims 1 to 7, characterized in that the knurl (27) is in the form of an axial knurl or in the form of a transverse knurl.
9. The terminal connection as claimed in one of claims 1 to 8, characterized in that the knurl (27) is provided with leading flattened sections (29) in the plug-in direction.
10. The terminal connection as claimed in one of claims 1 to 9, characterized in that a circumferential annular groove (111c) arranged therebetween is provided between the two outer circumferential surfaces of the plug-in sections (111a, 111b).
11. The terminal connection as claimed in one of claims 1 to 10, characterized in that the surface (31), which leads in the plug-in direction, of the lagging plug-in section (111b) of the plug-in element (1) acts as a stop shoulder which interacts with a corresponding stop surface (33) between the first and second accommodating section (211a, 211b) of the accommodating opening (3).
12. The terminal connection as claimed in one of claims 1 to 11, characterized in that the entire axial plug-in height of the plug-in attachment (111) corresponds to the axial accommodating height of the accommodating opening (3) such that, once the pressing-in procedure has been carried out, the plug-in insert (111) which has been pressed into the accommodating opening (3) ends flush with the housing wall (7) both on the inside and on the outside.
13. The terminal connection as claimed in one of claims 1 to 12, characterized in that the cross-sectional shape of the plug-in sections (111a, 111b) of the plug-in element (1) and the accommodating sections (211a, 211b), interacting therewith, of the accommodating opening (3) are circular or n-polygonal.
14. The terminal connection as claimed in one of claims 1 to 13, characterized in that the plug-in element (1) or housing wall (7) provided with the knurl (27) is made of a harder material than the housing wall (7) or plug-in element (1) interacting therewith.
15. The terminal connection as claimed in one of claims 1 to 14, characterized in that the sleeve attachment (111d) of the plug-in element (1) is arranged axially, counter to the plug-in direction, on the lagging plug-in section (111b) for the purpose of connecting the coaxial cable (19).
16. The terminal connection as claimed in one of claims 1 to 14, characterized in that the sleeve attachment (111d) of the plug-in element (1) is arranged axially, in the plug-in direction, on the leading plug-in section (111a) for the purpose of connecting the coaxial cable (19).
17. The terminal connection as claimed in one of claims 1 to 16, characterized in that a plurality of internal holes (17) are formed on the plug-in element (1) for the purpose of accommodating coaxial cable (19).

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