阅读说明：本技术 用于使屏蔽织物和接触元件接触的接触系统 (Contact system for contacting a shielding fabric with a contact element ) 是由 G·弗莱舍 K·弗勒施尔 M·施瓦特 于 2017-06-22 设计创作，主要内容包括：本发明涉及一种用于使铝屏蔽织物(7)与接触元件(1)接触的接触系统,其包括：——导电电缆(4)；——包括多条铝线的铝屏蔽织物(7),该铝屏蔽织物至少局部地在所述导电电缆(4)的初级绝缘件(6)与次级绝缘件(8)之间延伸地设置；——能推到导电电缆(4)上的接触元件(1),该接触元件包括外套筒(3)和能推入到该外套筒中的内套筒(2)。为了实现一种接触系统,该接触系统能够以简单的方式和方法实现铝屏蔽织物与接触元件可靠接触,而无需附加的焊接设备,按照本发明建议,所述内套筒(2)具有第一接触表面(2a)并且所述外套筒(3)具有第二接触表面(3a),其中,每个接触表面(2a、3a)分别具有带有不同大小的横截面的区域,并且所述接触表面(2a、3a)构造为使得铝屏蔽织物(7)在接触位置中通过使内套筒(2)和外套筒(3)沿轴向彼此嵌套移动而被夹紧并且与接触部件(1)接触。(The invention relates to a contact system for contacting an aluminium shielding fabric (7) with a contact element (1), comprising: -an electrically conductive cable (4); -an aluminium shielding fabric (7) comprising a plurality of aluminium wires, arranged extending at least partially between a primary insulation (6) and a secondary insulation (8) of the electrically conductive cable (4); -a contact element (1) that can be pushed onto the electrically conductive cable (4), the contact element comprising an outer sleeve (3) and an inner sleeve (2) that can be pushed into the outer sleeve. In order to create a contact system which makes it possible to achieve a reliable contact of the aluminum shielding fabric with the contact element in a simple manner and without additional welding equipment, it is proposed according to the invention that the inner sleeve (2) has a first contact surface (2a) and the outer sleeve (3) has a second contact surface (3a), wherein each contact surface (2a, 3a) has a region with a cross section of different size, and the contact surfaces (2a, 3a) are designed such that the aluminum shielding fabric (7) is clamped in the contact position by moving the inner sleeve (2) and the outer sleeve (3) axially into one another and into contact with the contact part (1).)

1. Contact system for contacting an aluminium shielding fabric (7) with a contact element (1), comprising:

-an electrically conductive cable (4) having an electrical inner conductor (5), a primary insulation (6) surrounding the electrical inner conductor (5) and a secondary insulation (8) surrounding the primary insulation (6);

-an aluminium shielding fabric (7) comprising a plurality of aluminium wires, arranged extending at least partially between a primary insulation (6) and a secondary insulation (8) of the electrically conductive cable (4);

-a contact element (1) that can be pushed onto an electrically conductive cable (4), comprising an outer sleeve (3) and an inner sleeve (2) that can be pushed at least partially into the outer sleeve (3),

characterized in that the inner sleeve (2) has a first contact surface (2a) and the outer sleeve (3) has a second contact surface (3a) for contacting the aluminum shielding fabric (7),

Wherein the first contact surface (2a) and/or the second contact surface (3a) have areas with cross-sections of different sizes with respect to a conductor axis (15) of the electrically conductive cable (4),

and the contact surfaces (2a, 3a) are configured such that the aluminium wires of the aluminium shielding fabric (7) are clamped between the contact surfaces (2a, 3a) and in contact with the contact component (1) in the contact position of the contact component (1) by moving the inner sleeve (2) and the outer sleeve (3) in an axial direction into each other.

2. Contact system according to claim 1, characterised in that the contact surfaces (2a, 3a) are furthermore configured such that in the contact position of the contact element (1) the aluminium wires of the aluminium shielding fabric (7) are pressed/sheared by pressing the outer sleeve (3) and the inner sleeve (2) together in the axial direction and the aluminium wires of the aluminium shielding fabric (7) are cold-welded with the contact element (1).

3. The contact system according to any one of claims 1 to 2, characterized in that the second contact surface (3a) of the outer sleeve (3) defines an insertion volume (9) for the inner sleeve (2), and the first contact surface (2a) of the inner sleeve (2) is constituted by a section (10) of the inner sleeve (2) which is insertable into the insertion volume (9).

4. the contact system according to claim 3, characterized in that the insertion volume (9) and/or the insertable section (10) is at least partially narrowed with respect to the conductor axis (15).

5. The contact system according to any one of claims 3 to 4, characterised in that the inner sleeve (2) is completely accommodated in the insertion volume (9) of the outer sleeve (3) in the contact position.

6. Contact system according to one of claims 1 to 5, characterized in that the first contact surface (2a) and/or the second contact surface (3a) are formed extending at least partially obliquely to a conductor axis (15) in the contact position.

7. The contact system according to any one of claims 1 to 6, characterised in that the first contact surface (2a) and/or the second contact surface (3a) are conically formed.

8. The contact system according to any one of claims 1 to 7, characterised in that the first contact surface (2a) and the second contact surface (3a) are conically formed, wherein the opening angles of the cones are at least locally not as large.

9. Contact system according to any one of claims 7 to 8, characterised in that the first contact surface (2a) and/or the second contact surface (3a) has at least one bend (12).

10. The contact system according to any one of claims 1 to 9, characterised in that the first contact surface (2a) and/or the second contact surface (3a) has at least one step (13, 14).

11. The contact system according to any one of claims 1 to 10, characterised in that the first contact surface (2a) has at least one first step (13) and the second contact surface (3a) has at least one second step (14), wherein the steps (13, 14) respectively constitute a surrounding contact edge and an aluminium shielding fabric (7) is in contact with the contact edge in the contact position.

12. The contact system according to any one of claims 1 to 11, characterized in that the inner sleeve (2) and/or the outer sleeve (3) are made of copper or a copper alloy.

13. Contact system according to any one of claims 1 to 12, wherein one of the sleeves (2, 3) is made of copper or a copper alloy and the respective other sleeve (3, 2) is made of aluminum or an aluminum alloy or stainless steel.

14. Contact system according to any one of claims 12 to 13, characterised in that the sleeve (2, 3) made of copper or a copper alloy has an anti-corrosion coating.

15. Contact system according to any one of claims 1 to 14, characterised in that the secondary insulation (8) is removed at least in the area of the electrically conductive cable (4) in which the contact element (1) is arranged in the contact position, wherein the area with the smallest cross section of the first contact surface (2a) adjoins the area of the cable (4) with the secondary insulation (8).

16. contact system according to any one of claims 1 to 15, characterised in that the inner sleeve (2) is arranged between the primary insulation (6) and the aluminium shielding fabric (7) in the contact position.

17. The contact system according to any one of claims 1 to 14, characterised in that the aluminium shielding fabric (7) is folded over onto the first contact surface (2a) of the inner sleeve (2) and the cable lead-through (11) of the inner sleeve (2) contacts the secondary insulation (8) or the aluminium shielding fabric (7).

18. Method for bringing an aluminium shielding fabric (7) consisting of aluminium wires, which surrounds an electric inner conductor (5) of an electrically conductive cable (4), into contact with a contact element (1),

Wherein the contact element (1) comprises an inner sleeve (2) with a first contact surface (2a) and an outer sleeve (3) with a second contact surface (3a) for contacting an aluminum shielding fabric (7),

Wherein the first contact surface (2a) and/or the second contact surface (3a) have areas with cross-sections of different sizes with respect to a conductor axis (15) of the electrically conductive cable (4),

And, carrying out the following steps:

-optionally removing a section of the secondary insulation (8) surrounding the aluminium shielding fabric (7) and/or a section of the primary insulation (6) surrounding the inner conductor (5) in the region of the open end of the cable (4);

-pushing the inner sleeve (2) and the outer sleeve (3) onto the conductive cable (4) if necessary;

-placing the inner sleeve (2) between the aluminium shielding fabric (7) and the inner conductor (5), wherein the aluminium shielding fabric (7) abuts against the first contact surface (2 a);

-moving the outer sleeve (3) towards the inner sleeve (2) into a contact position of the contact means (1) in which the second contact surface (3a) of the outer sleeve (3) contacts the aluminium shielding fabric (7) and the aluminium wires of the aluminium shielding fabric (7) are clamped between said contact surfaces (2a, 3 a).

19. The method according to claim 18, characterized in that the following method steps are additionally carried out:

-continuing the movement and pressing of the outer sleeve (3) towards the inner sleeve (2) such that the aluminium wires of the aluminium shielding fabric (7) are pressed/sheared by the pressure loading of the contact surfaces (2a, 3a) and the aluminium wires of the aluminium shielding fabric (7) are cold welded on the contact surfaces (2a, 3a) of the contact element (1).

20. Method according to any one of claims 18 to 19, characterized in that the outer sleeve (3) is first pushed onto the secondary insulation (8) and then the inner sleeve (2) is pushed between the aluminium shielding fabric (7) and the primary insulation (6) before the outer sleeve (3) is moved towards the inner sleeve (2).

21. method according to any of claims 18 to 19, characterized in that the inner sleeve (2) is first pushed onto the secondary insulation (8) and then the aluminium shielding fabric (7) is folded over onto the first contact surface (2a) before the outer sleeve (3) is moved towards the inner sleeve (2).

22. Method according to any one of claims 18 to 19, characterized in that the inner sleeve (2) is first pushed onto the aluminium shielding fabric (7) and then the section of the aluminium shielding fabric (7) protruding beyond the inner sleeve (2) is folded over onto the first contact surface (2a) before the outer sleeve (3) is moved towards the inner sleeve (2).

23. Method according to any one of claims 18 to 22, characterized in that a system for contacting according to any one of claims 1 to 17 is used for producing a cold-welded connection.

Technical Field

the invention relates to a contact system for contacting an aluminum shielding fabric with a contact element, comprising:

An electrically conductive cable having an electrical inner conductor, a primary insulation surrounding the electrical inner conductor, and a secondary insulation surrounding the primary insulation;

An aluminum shielding fabric comprising a plurality of aluminum wires, the aluminum shielding fabric being disposed at least partially extending between a primary insulation and a secondary insulation of the conductive cable;

a contact element that can be pushed (or slipped) onto the electrically conductive cable, the contact element comprising an outer sleeve and an inner sleeve that can be pushed at least partially into the outer sleeve.

Background

The cable (the inner conductor of which conducts the high voltage) needs to be electrically shielded to prevent influences on nearby electrical or electronic components. Likewise, the shielding can also be provided for protecting the inner conductor against external electrical and/or magnetic interference. For shielding purposes, a shielding fabric consisting of a plurality of strands of electrically conductive material is provided, which surrounds the electrical inner conductor. In this case, the shielding fabric is usually located in the cable jacket and is arranged here between the primary insulation (also referred to as inner jacket, which is arranged between the inner conductor and the shielding fabric) and the secondary insulation (also referred to as outer jacket or cable jacket, which surrounds the shielding fabric on the outside). In order to increase the shielding effect of the shielding textile, a shielding film, which is usually a plastic-bonded aluminum film, can additionally be arranged between the primary insulation and the shielding textile or between the shielding textile and the secondary insulation. The shielding films do not carry significant current and do not contact together in the case of contacting the shielding fabric, but are separated when the shielding fabric is exposed.

In order to ensure the potential compensation of the shielding or the shielding fabric of the inner conductor, it is necessary that the shielding fabric can be connected to a ground line in the end region of the cable. For this purpose, at least one contact element is usually provided on each end of the cable, which contact element is connected electrically conductively to the shielding fabric and can be connected to a ground line.

Known methods for connecting a shielding fabric made of copper to a contact element, for example, as disclosed in DE102015004485B4, are usually carried out by pushing a support sleeve onto the secondary insulation of the cable and folding the exposed shielding fabric back onto the support sleeve. The contact part is then guided over the support sleeve and the shielding fabric situated thereon and is pressed radially, for example crimped, with a suitable tool for the contact. By means of the pressing process, the shielding fabric is clamped between the support sleeve and the contact part. The method can be used only in materials with good transverse conductivity, since the pressing of the shielding fabric takes place only in points.

Aluminum or aluminum alloys, which are used in many fields of application, for example in the automotive field, in particular in electrically driven vehicles, on account of their low mass, are also suitable as conductive materials for shielding fabrics. However, if aluminum wires made of aluminum or an aluminum alloy are pressed against one another, these wires of course already have an oxide layer on their surface which is very difficult to penetrate. The contact process for the shielding fabric, which is customary in copper technology, cannot establish contact of all the aluminum wires of the aluminum shielding fabric with the contact element due to radial pressing, since the oxide layer formed on the aluminum wires prevents lateral conductivity in the pressed region. The oxide layer is therefore not penetrable by all threads in the shielding fabric by known methods. It has also been found that a connection which is stable under temperature-alternating loads cannot be realized in an aluminum shielding fabric using the known contact methods.

in order to be able to achieve a uniform shielding contact in the material, known connection methods for aluminum shielding fabrics use additional measures to ensure contact of all aluminum wires and to be able to cleave the oxide layer if necessary. It is known, for example, from DE10201200137B4 that, when an aluminum shielding fabric is connected to the sleeve, the shielding fabric is folded back onto the sleeve and the connection is established by means of ultrasonic welding. In the method, a material-locking connection is produced between the shielding fabric and the contact element by means of heat transfer.

This connection technique has the following disadvantages: the quality of the shield strands also always influences the quality of the connection, whereby the adhering substances from previous processes are mainly disturbance-influencing variables. On the other hand, the establishment of such an electrically conductive connection between the aluminum shielding fabric and the contact element depends on the presence of expensive soldering equipment, which for this reason is not yet portable and therefore not flexibly usable.

Disclosure of Invention

The object of the present invention is therefore to overcome the disadvantages of the prior art and to provide a system which in a simple manner enables reliable contacting of the aluminum shielding fabric with the contact element without additional welding equipment.

The object is achieved in a contact system according to the invention for contacting an aluminum shielding fabric with a contact element of the type mentioned at the outset in that the inner sleeve has a first contact surface and the outer sleeve has a second contact surface for contacting the aluminum shielding fabric, wherein the first contact surface and/or the second contact surface have areas with cross sections of different sizes with respect to a conductor axis of the electrically conductive cable, and the contact surfaces are designed such that the aluminum wires of the aluminum shielding fabric are clamped between the contact surfaces and are in contact with the contact part in a contact position of the contact part by moving the inner sleeve and the outer sleeve axially into contact with one another.

In the sense of the present invention, not only a single conductor but also a strand consisting of a plurality of single conductors or a group of two, three, four or more strands surrounded by a primary insulation is understood to be an electrical inner conductor made of an electrically conductive material, preferably copper, aluminum or an alloy comprising at least one of these metals. The electrical inner conductor defines a conductor axis, which may follow the course of the cable, i.e. run locally straight, curved or angled. However, the conductor axis extends generally linearly, at least in the contact region.

A sleeve is generally understood to be an element which comprises a preferably central through-opening and a preferably rotationally symmetrical outer casing having the through-opening. In this case, the through-opening can in principle have any geometric cross section, as long as it ensures the guidance through at least one section of the electrically conductive cable. The inner sleeve is here a sleeve which is arranged in the contact position in the radial direction next to the inner conductor. In other words, the inner sleeve can be pushed onto the electrically conductive cable such that the through-hole of the inner sleeve (which is referred to hereinafter as cable lead-through) is advantageously matched to the geometry of the electrical inner conductor of the cable, for example circular, elliptical or substantially polygonal. The outer shell of the inner sleeve is designed in such a way that the inner sleeve can be pushed at least partially into the outer sleeve, wherein the first contact surface of the inner sleeve is usually formed by the radially outer circumferential surface of the inner sleeve. Usually, the pushability is achieved in that the outer dimension of the inner sleeve is smaller than or equal to the inner dimension of the through hole of the outer sleeve. The second contact surface of the outer sleeve is usually formed by the radially inner circumferential surface (with reference to the defining surface of the through-hole of the outer sleeve).

The contact surface is in any case defined by the surface of the inner sleeve or the outer sleeve and virtually forms a volume. If reference is made according to the invention to a cross section of the contact surface, this is to be understood in the sense of a cross section of the volume formed, which cross section is oriented perpendicularly to the conductor axis.

The aluminum shielding fabric is arranged between the contact surfaces in the contact position such that the aluminum wires of the aluminum shielding fabric (preferably as much as possible of all the aluminum wires) contact both the first contact surface and the second contact surface. Due to the differently sized cross sections of at least one of the contact surfaces in the inner sleeve and the outer sleeve, which are arranged according to the invention, which contact surfaces are usually arranged in correspondence with each other in the contact position, the aluminum wires of the aluminum shielding fabric contacting the contact surfaces have been clamped by moving the outer sleeve and the inner sleeve in an axial direction into nesting with each other. By means of different cross sections, in the case of circular cross sections, which correspond to the diameters in different regions of at least one of the co-acting contact surfaces, which regions merge continuously or in jumps into one another, at least one region is defined in which the clamping forces acting on the aluminum shielding fabric by the contact surfaces are exerted when the sleeves are moved into one another. Preferably, each contact surface has a region with a cross section of different size.

thus, an electrical contact is established between the outer sleeve and/or the inner sleeve and the aluminum wire, so that a potential compensation can be achieved. In order to select the geometry of the co-operating contact surfaces of the sleeves, various shapes are contemplated, as long as at least one region is defined by the design of the contact surfaces and their cross-sections, by means of which a clamping force acting on the aluminum shielding fabric is exerted when the sleeves are moved into nesting with one another.

In this context, the term axially nested with one another or pressed together means that the two sleeves are axially nested with one another or pressed against one another in the direction of the conductor axis and that the pressing is not effected by subsequent radial pressing (for example crimping) as is known from the prior art. Uniform contact between the aluminum wire and the contact element has therefore already been achieved by moving the sleeves one inside the other, since the pressing no longer takes place radially or in a punctiform manner, but rather extends uniformly over the contact surface and the aluminum wire.

Although the invention relates to an aluminium shielding fabric made of aluminium wires, it is explicitly pointed out that the contact element according to the invention is also suitable for shielding fabrics made of other materials or alloys, for example made of copper or copper alloys.

In order to ensure contact between the aluminum wires of the aluminum shielding fabric and the contact element in a simple manner, in particular in order to be able to reliably penetrate the oxide layer of the aluminum wires, it is provided in one embodiment of the invention that the contact surfaces are furthermore configured in such a way that, in the contact position of the contact element, the aluminum wires of the aluminum shielding fabric are pressed/sheared by axially pressing the outer sleeve and the inner sleeve together and are cold-welded to the contact element.

In this embodiment variant, the contact between the aluminum shielding fabric and the contact element is thus achieved in that the contact surfaces of the inner sleeve and the outer sleeve are configured in such a way that the surfaces of as many as possible all aluminum wires of the aluminum shielding fabric with the oxide layer split when the inner sleeve and the outer sleeve are pressed together in the axial direction, so that a cold weld can be produced between at least one contact surface and the aluminum shielding fabric. In order to split the surface, the aluminum wire is squeezed or at least partially sheared/sheared off when being squeezed together, so that a cold weld occurs between the aluminum wire and at least one of the sleeves (i.e. the inner and/or outer sleeve). The regions of different cross sections of the contact surface, which preferably correspond to one another, again define at least one region in which a pressure peak is formed when pressing together. The regions generally correspond to regions to which a clamping force is also applied. The cold-welded state can thus be achieved by pressing the sleeves together, for example, axially, starting from a contact position in which the aluminum shielding fabric is clamped between the contact surfaces.

The effect that aluminum flows easily using very high pressures and can thus be cold-welded to materials in contact is exploited in cold welding. This connection is not releasable and electrically conductive.

In other words, by selecting the geometry of the co-acting contact surfaces taking into account the areas with differently sized cross sections, it is ensured that the oxide layer is reliably penetrated when the sleeves are pressed together in the axial direction in such a way that the aluminum wires of the aluminum shielding fabric are pressed or sheared off in the area defined by the contact surfaces. At the same time, the connection by means of the contact system according to the invention is insensitive to surface contamination of the aluminum shielding fabric due to the local shearing/pressing and the cold welding carried out there. In order to select the geometry of the co-acting contact surfaces of the sleeve, various shapes can be considered, as long as at least one region is defined by the design of the contact surfaces and their regions with different cross-sections, in which region a pressure peak is formed when pressing together in the axial direction, which pressure peak leads to a pressing/shearing of the aluminum wire and ultimately to a cold welding.

Typically, one of the sleeves is made of copper or a preferably coated copper alloy and serves as a contact sleeve, while the other sleeve serves as a support sleeve. In an advantageous manner, the cold welding is carried out not only between the contact sleeves but also between the support sleeve and the aluminum shielding fabric.

In a further embodiment of the invention, it is provided that the second contact surface of the outer sleeve defines an insertion volume for the inner sleeve, and the first contact surface of the inner sleeve is formed by a section of the inner sleeve which can be inserted into the insertion volume. The insertion volume of the outer sleeve is usually formed by a section of the through-hole, preferably completely. The cooperation of the contact surfaces can be achieved in a simple manner by the insertion volume of the outer sleeve and the design of the insertable section of the inner sleeve.

According to a further embodiment of the invention, the insertion volume and/or the insertable section is/are at least partially narrowed with respect to the conductor axis. By the narrowing of at least one, preferably two, elements forming the contact surface, the geometry of the contact surface, which causes the clamping or the pressing/shearing of the aluminum shielding fabric in the contact position, is achieved in a simple manner. In the narrowed section, a region is formed which exerts a clamping force on the aluminum wire or causes a compression/shearing of the aluminum wire. It goes without saying that two, three, four or more narrowing sections can also be provided. In other words, the contact surfaces can be configured such that in an intermediate position of the contact part, in which the inner sleeve is pushed partially into the outer sleeve, a gap for accommodating the aluminum shielding fabric is formed between the contact surfaces and has at least one cross-sectional constriction.

In a preferred embodiment, a particularly space-saving design of the contact element is achieved in that the inner sleeve is completely accommodated in the insertion volume of the outer sleeve in the contact position. In other words, the entire inner sleeve is configured as an insertable section.

in order to be able to create and define regions with different cross sections in the contact surface in a simple manner, it is provided in a further embodiment of the invention that the first contact surface and/or the second contact surface are formed in the contact position at least in regions extending obliquely to the conductor axis. In other words, an imaginary extension of the first contact surface and/or the second contact surface intersects the conductor axis.

In a particularly simple manner, in a preferred embodiment variant, the clamping and/or compression/shearing of the aluminum wires of the aluminum shielding fabric between the contact surfaces can be achieved in that the first contact surface and/or the second contact surface are conically formed. The tapering of at least one contact surface, preferably both contact surfaces, which is generally related to the conductor axis, is achieved by the contact surfaces exerting a clamping force on the aluminum wire or forming a pressure peak for the pressing/shearing (i.e. cold welding) of the aluminum wire by moving the sleeve axially into the contact position. It is self-evident here that the contact surfaces are formed corresponding to one another, at least if the two contact surfaces are formed conically.

In a further preferred embodiment, the increase in the clamping force or the particularly effective definition of the region in which the cold welding occurs is achieved in that the first contact surface and the second contact surface are formed conically, wherein the opening angles of the cones are at least locally not the same. Due to the different opening angles with respect to the conductor axis, an increase in the clamping force occurs when the axial displacement into each other is carried out, on the one hand, in the region of the smallest clear distance between the contact surfaces. On the other hand, a region between the contact surfaces can thereby be defined in which a pressure peak is formed when the sleeve is pressed together. Based on the pressure peak, shearing/extrusion of the aluminum wire can be achieved to establish the cold weld.

Furthermore, the effect mentioned above in connection with the conical contact surface can be further improved in that the first contact surface and/or the second contact surface has at least one bend. A bend is understood here to mean a change in the slope of a conical or frustoconical contact surface or else a continuous transition between two sections which transition into one another and have different contact surface angles. In this case, each bend defines a circumferential contact edge, on which a pressure peak is formed and/or which exerts a clamping force on the aluminum shielding fabric. Advantageous effects have been observed when only one contact surface has a bend. However, variants are also conceivable in which one contact surface has a plurality of folds, or both contact surfaces have one or more folds. The bend in turn defines a region in which a clamping force is exerted on the aluminum wire in the contact position or in which a pressure peak is formed.

As a further possibility for achieving a clamping and/or a pressing/shearing of the aluminum wires of the aluminum shielding fabric between the contact surfaces of the sleeve, it is provided in a particularly preferred embodiment of the invention that the first contact surface and/or the second contact surface has at least one step. A step is understood here as a sudden increase or decrease of the cross section defining the respective contact surface perpendicular to the conductor axis. This design can be combined with any geometry of the contact surfaces, for example the first contact surface and/or the second contact surface may have a cylindrical shape or the previously described conical shape. It is advantageous here if the two contact surfaces have a first step portion and a second step portion which correspond to one another. In turn, a region is defined by the at least one first step and/or second step, in which a pressure peak is formed in the contact position for applying a clamping force or for pressing/shearing and cold welding the aluminum wires of the aluminum shielding fabric. Advantageous effects have been observed when only one of the contact surfaces has a step. However, variants are also conceivable in which one contact surface has a plurality of steps or in which two contact surfaces have one or more steps.

In order to reinforce the advantages mentioned above in connection with the step, according to another particularly preferred embodiment of the invention it is provided that the first contact surface has at least one first step and the second contact surface has at least one second step, wherein the steps each form a surrounding contact edge and the aluminum shielding fabric is in contact with the contact edges in the contact position. The contact edges in turn define a region in which a pressure peak is formed in the contact location for applying a clamping force or for pressing/shearing and cold-welding the aluminum wires of the aluminum shielding fabric.

for the potential compensation, it is advantageous if one of the sleeves is designed as a contact sleeve, via which the potential compensation can be carried out, and the other sleeve is designed as a support sleeve. In order to achieve good connection properties between the aluminum wires of the aluminum shielding fabric and the contact sleeve, it is particularly advantageous if the contact sleeve is made of copper or a copper alloy. Depending on the field of application, the inner sleeve or the outer sleeve may be configured to contact the sleeve. It is also conceivable that not only the contact sleeve but also the support sleeve is made of copper or a copper alloy. In a further embodiment of the invention, it is therefore provided that the inner sleeve and/or the outer sleeve are made of copper or a copper alloy.

In a further embodiment, particularly good clamping or cold welding properties and electrical line properties are achieved in that one of the sleeves is made of copper or a copper alloy and the respective other sleeve is made of aluminum or an aluminum alloy. The corrosion tendency of the aluminum wire in the region of the contact elements is further minimized by the sleeve made of aluminum or an aluminum alloy, i.e. the sleeve configured to support the sleeve. In order to achieve a particularly high strength of the support sleeve, the support sleeve can also be made of stainless steel, which is preferably protected against corrosion, for example by means of a corrosion protection coating.

in order to also improve the corrosion properties of the sleeve made of copper or a copper alloy, preferably a contact sleeve, and to reduce the corrosion tendency of the aluminum wire, in a further particularly preferred embodiment of the invention it is provided that the sleeve made of copper or a copper alloy has an anti-corrosion coating. For such a corrosion-resistant coating, in particular an alloy comprising nickel and/or tin or nickel and/or tin is suitable as coating material.

In order to be able to bring the aluminium shielding fabric arranged between the primary and secondary insulation into contact with the contact elements, it is generally necessary to cut the cable and to de-sheath the aluminium shielding fabric at the open end of the cable, i.e. to remove at least the secondary insulation, and to position the inner sleeve relative to the electrical conductor. In a further embodiment of the invention, it is therefore provided that the secondary insulation is removed at least in the region of the electrically conductive cable in which the contact element is arranged in the contact position, wherein the region with the smallest cross section of the first contact surface adjoins the region of the cable with the secondary insulation.

While it is known from the prior art that the contact element is placed on the secondary insulation of the cable in the contact position and the shielding fabric is folded back onto the contact element in order not to damage the inner conductor by subsequent radial pressing or welding, it is possible with the configuration according to the invention of the inner sleeve and the outer sleeve to arrange the contact element in the cable in the region of the insulation sheath removed, i.e. in the region of the secondary insulation removed, in a space-saving manner. The reason for this is that the clamping or cold welding is only achieved by the inner sleeve and the outer sleeve being moved into one another or being pressed together axially, and therefore there is absolutely no risk of damage to the inner conductor as a result of axial compression of the sleeves. Preferably, the inner sleeve is pushed in between the primary insulation and the aluminum shielding fabric, so that the inner sleeve contacts the primary insulation on the one hand and the aluminum shielding fabric on the other hand. In a further preferred embodiment of the invention, it is therefore provided that the inner sleeve is arranged between the primary insulation and the aluminum shielding fabric in the contact position, wherein preferably the cable lead-through of the inner sleeve contacts the primary insulation. Thus, not only the inner sleeve but also the outer sleeve or at least the contact surfaces thereof are located in the radial direction in the region of the cable that is skinned.

in a further embodiment of the invention, it is provided that the aluminum shielding fabric is folded over onto the first contact surface of the inner sleeve, and the cable lead-through of the inner sleeve contacts the secondary insulation or the aluminum shielding fabric. When the inner sleeve is located on the secondary insulation in the contact position and therefore the cable lead-through (in reference to the through-hole) of the inner sleeve contacts the secondary insulation, the aluminum shielding fabric has to be folded over onto the first contact surface for the contact. A particularly space-saving configuration is achieved in that the inner sleeve is pushed onto the aluminum shielding textile in the region of the cable that is de-insulated and thereafter the aluminum shielding textile is folded over onto the first contact surface. Here, the cable lead-through contacts a section of the aluminum shielding fabric which bears against the primary insulation, and the first contact surface contacts a folded-back portion of the aluminum shielding fabric.

the object mentioned at the outset is also achieved by a method for contacting an aluminum shielding fabric, which is composed of aluminum wires and surrounds an electrical inner conductor of an electrically conductive cable, with a contact element, wherein the contact element comprises an inner sleeve with a first contact surface and an outer sleeve with a second contact surface, wherein the following steps are carried out:

If appropriate, a section of the secondary insulation surrounding the aluminum shielding fabric and/or a section of the primary insulation surrounding the inner conductor is removed in the region of the open end of the cable;

-pushing the inner sleeve and the outer sleeve onto the conductive cable if necessary;

-placing the inner sleeve between the aluminium shielding fabric and the inner conductor, wherein the aluminium shielding fabric abuts against the first contact surface;

-moving the outer sleeve towards the inner sleeve into a contact position of the contact means in which the second contact surface of the outer sleeve contacts the aluminium shielding fabric and the aluminium wires of the aluminium shielding fabric are clamped between said contact surfaces.

in this case, the electrically conductive cable is first cut off and the open cable end produced thereby is stripped, wherein at least the secondary insulation is removed in the region where contact is to be established with the contact element or up to this region during stripping. It goes without saying that it is also possible to use a cut cable with an open end which is stripped.

the inner sleeve and the outer sleeve are then pushed onto the cable, wherein the cable is guided through the through-opening of the sleeve or the insertion volume and the cable lead-through. However, it is also conceivable that the cable has been provided in a prefabricated manner, so that the outer sleeve and the inner sleeve only have to be pushed or squeezed together.

If the contact elements are to be arranged in the contact position in the region of the cable that is not skinned, it is necessary first to push the inner sleeve onto the secondary insulation, then to fold the aluminum shielding fabric over onto the secondary insulation or onto the inner sleeve, and then to push the outer sleeve from the direction of the skinned region of the cable towards the inner sleeve. In other words, the inner sleeve is placed between the secondary insulation and the folded back section of the aluminum shielding fabric. Therefore, according to a further embodiment variant of the invention, it is provided that the inner sleeve is first pushed onto the secondary insulation and then the aluminum shielding fabric is folded over onto the first contact surface before the outer sleeve is moved toward the inner sleeve. The outer sleeve is moved from the open end of the cable to the region of the electrically conductive cable with the secondary insulation in order to be brought into the contact position.

if, however, the contact elements are to be arranged in the contact position in a space-saving manner in the area of the cable that is to be stripped, as is provided in a preferred embodiment variant of the invention, the outer sleeve is first pushed onto the secondary insulation of the cable. The inner sleeve is then pushed between the primary insulation and the aluminum shielding fabric, so that it is no longer necessary to fold over the aluminum shielding fabric. The outer sleeve is then pushed towards the de-insulated region of the cable or towards the inner sleeve. Therefore, according to a further embodiment variant of the invention, it is provided that the outer sleeve is first pushed onto the secondary insulation and then the inner sleeve is pushed between the aluminum shielding fabric and the primary insulation before the outer sleeve is moved towards the inner sleeve. The outer sleeve is moved from the region of the cable with the secondary insulation to the open end of the cable in order to be brought into the contact position.

In a particularly space-saving manner, the inner sleeve is pushed directly onto the aluminum shielding fabric which bears against the primary insulation in the region of the insulation displacement and the aluminum shielding fabric is folded over onto the first contact surface in the region of the insulation displacement of the electrically conductive cable. The aluminum shielding fabric is exposed to such an extent that a section can project beyond the pushed-on inner sleeve and be folded over. The outer sleeve is then moved towards the area of the conductive cable having the secondary insulation. Thus, according to a further embodiment variant of the invention, provision is made for: the inner sleeve is first pushed onto the aluminium shielding fabric and then the section of the aluminium shielding fabric protruding beyond the inner sleeve is folded over onto the first contact surface before moving the outer sleeve towards the inner sleeve. The outer sleeve is moved from the direction of the cable open end toward the region of the electrically conductive cable having the secondary insulation in order to be brought into the contact position.

In all of the above-mentioned variants, the inner sleeve is placed in any case (if necessary under the intermediate layer of the primary insulation and/or the secondary insulation) between the inner conductor and the shielding fabric, viewed in the radial direction.

the aluminum wires of the aluminum shielding fabric are clamped between the contact surfaces by moving the outer sleeve and the inner sleeve in an axial direction into nesting relation with each other, as described in detail at the beginning in connection with the contact system.

In order to ensure in a simple manner a contact between the aluminum wires of the aluminum shielding fabric and the contact element, in particular to be able to reliably penetrate the oxide layer of the aluminum wires, it is provided in one embodiment of the method according to the invention that the following method steps are additionally carried out:

-continuing to move and press the outer sleeve towards the inner sleeve such that the aluminium wires of the aluminium shielding fabric are pressed/sheared by the pressure loading of the contact surfaces and cold welded on the contact surfaces of the contact elements. It is particularly advantageous if the system according to the invention is used in conjunction with the method according to the invention or if the system according to the invention can be produced by the method according to the invention.

drawings

The invention will now be explained in more detail with the aid of examples. The figures are exemplary and are intended to illustrate the inventive concept, but in no way limit the invention or even merely describe it.

In the drawings:

Fig. 1 shows a cross-sectional view of a contact system according to the invention in a contact position;

FIG. 2 shows a three-way view of the contact system in the contact position;

FIG. 3 shows a three-way view of the first embodiment of the contact system in an intermediate position;

FIG. 4 shows a three-way view of the second embodiment of the contact system in an intermediate position;

FIG. 5 shows an enlarged detail of the contact element of the first embodiment;

FIG. 6 shows an enlarged detail of a contact element of the second embodiment;

FIGS. 7a, 7b, 7c, 7d show sectional views of the first exemplary embodiment in several successive positions;

FIGS. 8a, 8b, 8c, 8d show sectional views of the second exemplary embodiment in a plurality of successive positions;

Fig. 9 shows a sectional view of a third embodiment of the contact system in the contact position;

Fig. 10 shows a cross-sectional view of a fourth embodiment of the contact system in the contact position.

Detailed Description

Fig. 1 and 2 show the basic structure of a contact system according to the invention for contacting an aluminum shielding fabric 7 with a contact element 1. The aluminium shielding fabric 7 comprises a plurality of aluminium wires and extends between the primary and secondary insulation 8 of the conductive cable 4. The structure of the cable 4, which is visible in particular in fig. 2 and 4, appears here as follows: the core of the cable 4 is constituted by an electrical inner conductor 5 defining a conductor axis 15 extending straight in the figure. In the present figure, the inner conductor 5 is made up of a plurality of single conductors gathered into a litz wire and has a substantially circular cross section. It is self-evident here that the number of individual conductors of the litz wire and the number of litz wires or the geometry of the cross section are not critical to the invention itself. Thus, in principle, for example, not only a single conductor but also an oval or polygonal cross section of the inner conductor 5 can be envisaged. Mounted on the inner conductor 5 is a primary insulation 6, also called inner jacket or conductor insulation, which effects the insulation between the inner conductor 5 and the aluminium shielding fabric 7. On the aluminium shielding fabric 7 is then mounted a secondary insulation 8, also called outer jacket or cable jacket, which insulates the inner conductor 5 and the aluminium shielding fabric 7 from the surroundings.

Before the contact of the aluminium shielding fabric 7 with the contact element 1 can be achieved, the electrically conductive cable 4 must usually be cut off so that an open end of the cable 4 is formed. The secondary insulation 8 is removed in the area of the electrically conductive cable 4 in which the contact element 1 can be arranged. Therefore, the areas of the deintenized skin are discussed later in this regard. Usually, the deinsed region is arranged in the section of the open end of the cable 4 and extends as visible in the drawing up to the end of the cable 4. Furthermore, as can be seen in the figure, the end-side section of the cable 4 can also be cleared of the primary insulation 6, the aluminum shielding fabric 7 and the secondary insulation 8, so that the inner conductor 5 for the electrical connection is exposed.

The contact element 1 comprises an inner sleeve 2 with a first contact surface 2a and an outer sleeve 3 with a second contact surface 3a, wherein the contact surfaces 2a, 3a are configured for contacting the aluminum shielding fabric 7 in the shown contact position. The inner sleeve 2 can be pushed into the outer sleeve 3 at least in regions. At least one of the two sleeves 2, 3 is designed as a contact sleeve and can be electrically connected to a ground line for the purpose of potential compensation.

Since the contact surfaces 2a, 3a of the sleeves 2, 3 are configured such that the aluminum wires of the aluminum shielding fabric 7 are clamped and brought into contact with the contact component 1 in the contact position of the contact component 1 by moving the inner sleeve 2 and the outer sleeve 3 axially within each other between the contact surfaces 2a, 3a, the aluminum shielding fabric 7 is clamped between the contact surfaces 2a, 3a in the contact position shown. Furthermore, the contact surfaces 2a, 3a are also configured in the embodiment such that in the contact position of the contact element 1 the aluminum wires of the aluminum shielding fabric 7 are pressed/sheared and the aluminum wires of the aluminum shielding fabric 7 are cold-welded with the contact element 1 by pressing the outer sleeve 3 and the inner sleeve 2 together in the axial direction. The construction is achieved in that the contact surfaces 2a, 3a have areas of different cross-section, in the present case areas of different diameter. The electrical connection between the aluminum wires of the aluminum shielding fabric 7 and the contact element 1 is thus established by means of cold welding in the shown contact position. In other words, the aluminum wire is welded to the contact element 1 in the contact position.

In principle, a uniform contact of as many as possible all aluminum wires is achieved in any case by the contact surfaces 2a, 3a surrounding the aluminum shielding fabric 7 without radial pressing, for example crimping, or without additional welding. The electrical contact can still be established by simply pushing or squeezing the sleeves 2, 3 together.

Two possible geometrical designs of the contact surfaces 2a, 3a, which achieve the two effects described above, are discussed in detail below.

Fig. 3 shows a three-way view of the first embodiment of the system according to the invention in a neutral position, in which the contact surfaces 2a, 3a of the sleeves 2, 3 have not yet been in contact with the aluminium shielding fabric 7. It is evident here that the first contact surface 2a of the inner sleeve 2 is conically formed, so that the size of the cross section or the diameter perpendicular to the conductor axis 15 varies along the entire longitudinal extension of the sleeves 2, 3. In other words, the two contact surfaces 2a, 3a extend obliquely to the conductor axis 15. It can also be seen that the contact surface 2a has two sections of different slope, which merge into one another at the bend 12. In this case, the contact surface 2a has a larger opening angle, i.e. a steeper opening angle, in the first section in the present illustration toward the outer sleeve 3 than in the second section.

Fig. 4 shows a three-way view similar to fig. 3 of a second embodiment of the system according to the invention in an intermediate position. It can be seen here that the first contact surface 2a of the inner sleeve 2 consists of three cylindrical sections of different cross-sections or diameters, wherein two first steps 13 each separate two sections one after the other from each other.

The contact element 1 of the first embodiment is shown in detail in fig. 5 and the contact element 1 of the second embodiment is shown in fig. 6, respectively referring to the inner sleeve 2 and the outer sleeve 3. In this case, it can be seen directly that the inner sleeve 2 and the outer sleeve 3 each have a through-opening, and the inner sleeve 2 can be pushed at least partially into the outer sleeve 3. The through-hole of the inner sleeve 2 is configured as a cable lead-through 11 through which the cable 4 can be guided. The first contact surface 2a of the inner sleeve 2 is constituted by the outer circumferential surface of the inner sleeve 2.

The through-opening of the outer sleeve 3 is designed to receive an insertion volume 9 of an insertable section 10 of the inner sleeve 2 and, furthermore, to guide the cable 4 through. In the present embodiment, the insertable section 10 surrounds the entire extension of the inner sleeve 2, so that the inner sleeve 2 is completely accommodated in the outer sleeve 3 in the contact position. In an alternative embodiment variant, it is also conceivable for the insertable section 10 to comprise only a part of the longitudinal extension of the inner sleeve 2, so that a part of the inner sleeve 2 projects from the outer sleeve 3 in the contact position. The second contact surface 3a is formed by an inner circumferential surface of the outer sleeve 3a and defines an insertion volume 9.

In both embodiments it can be seen that the geometry of the first contact surface 2a corresponds to the geometry of the second contact surface 3a, as long as the aluminium shielding fabric 7 can be clamped or cold-weldable between the contact surfaces 2a, 3 a.

The tapering of the first contact surface 2a described previously in connection with the first embodiment is again shown in fig. 5 together with the bend 12. Furthermore, the conical configuration of the second contact surface 3a of the outer sleeve 3 can now also be seen. In the present embodiment, the opening angles of the tapers of the contact surfaces 2a, 3a differ from one another, so that a wedge-shaped cross-sectional constriction is achieved when the inner sleeve 2 is pushed into the outer sleeve 3 or when the outer sleeve 3 is pushed onto the inner sleeve 2. The bend 12 defines a region in which a clamping force is exerted by the contact surfaces 2a, 3a on the aluminum wire or in which pressure peaks for the pressing/shearing and cold welding of the aluminum wire are formed. The region is thus a circumferential contact edge defined by the bend.

While in fig. 6 the first step 13 of the first contact surface 2a previously described in connection with the second embodiment variant can be seen. Now also the second contact surface 3a is shown, which has a second step 14 cooperating with the first step 13, which second step 14 divides the second contact surface 3a into three sections. When the inner sleeve 2 is pushed into the outer sleeve 3 or when the outer sleeve 3 is pushed onto the inner sleeve 2, the wedge-shaped cross-sectional constriction is again achieved by the cooperation of the steps 13, 14. In other words, the step 13, 14 defines a region in which a clamping force is exerted by the contact surfaces 2a, 3a on the aluminum wire or in which pressure peaks for the pressing/shearing and cold welding of the aluminum wire are formed. In this exemplary embodiment, a circumferential contact edge is formed by each of the steps 13, 14, which contact edge represents the aforementioned region.

Fig. 7a, 7b, 7c, 7d and fig. 8a, 8b, 8c, 8d show different positions of the contact element 1 or the inner sleeve 2 and the outer sleeve 3 during the contacting process, wherein in the first-mentioned figure the system according to the first embodiment is shown and in the last-mentioned figure the system according to the second embodiment is shown.

In a first step (visible in fig. 7a, 7b or fig. 8a, 8 b), the outer sleeve 3 is pushed onto the conductive cable 4, respectively. In this case, the outer sleeve 3 is pushed beyond the region of the skin to be stripped, so that the outer sleeve 3 bears against the secondary insulation 8. In order to be able to ensure that the outer sleeve 3 can be pushed onto the secondary insulation 8, the minimum diameter of the through-hole of the outer sleeve is greater than or equal to the diameter of the cable 4 together with the secondary insulation 8. In other words, the cable 4 is locally accommodated in the insertion volume 9 of the outer sleeve 3.

The second step (shown in figures 7b, 7c and 8b, 8 c) consists in pushing the inner sleeve 2 onto the electrically conductive cable 4. The minimum diameter of the cable leadthrough 11 is greater than or equal to the diameter of the cable 4 together with the primary insulation 6, so that the inner sleeve 2 can be pushed onto the primary insulation 6.

as can be seen in fig. 7c and 8c, the inner sleeve 2 is pushed in between the primary insulation 6 and the aluminum shielding fabric 7, so that the aluminum shielding fabric 7 is in contact with the first contact surface 2 a. It is also conceivable here for the aluminum shielding fabric 7 to be lifted off the primary insulation 6 in a separate step and to be slipped onto the first contact surface 2a after the inner sleeve 2 has been pushed up, for example by means of the steps described below or in a separate step.

the outer sleeve 3 is then moved in a final step towards the inner sleeve 2 until, in the contact position, the second contact surface 3a and the first contact surface 2a contact the aluminium shielding fabric 7 and the aluminium wires of the aluminium shielding fabric 7 are clamped between the contact surfaces 2a, 3a and an electrical contact is established between the contact element 1 and the aluminium shielding fabric 7. The wedge-shaped taper or bend 12 in the first exemplary embodiment and the steps 13, 14 in the second exemplary embodiment thereby define the region of the contact surfaces 2a, 3a in which a clamping force is exerted on the aluminum shielding fabric 7 in the contact position.

When the inner sleeve 2 and the outer sleeve 3 are pressed together further, a pressure peak forms at the folds 12 or at the steps 13, 14 (i.e. at the encircling contact edges), which pressure peak first leads to a compression and, when pressed together further, to an at least partial pressing or shearing, preferably a complete shearing, of the aluminum wire, so that a cold welding of the aluminum wire of the aluminum shielding fabric 7 with the contact element 1 takes place. By pressing or shearing the aluminum wire, the surface of the aluminum wire with the oxide layer is cracked and thus the oxide layer is penetrated and the oxide layer is prevented from reforming, so that when the aluminum wire is cold-welded in the contact position with the contact element 1 in the contact position after being pressed together, a good electrically conductive connection between the aluminum shielding fabric 7 and the contact element 1 against temperature changes is ensured.

Usually, one of the two sleeves 2, 3, i.e. the inner sleeve 2 or the outer sleeve 3, is designed as a contact sleeve which is made of copper or a copper alloy and preferably has an anti-corrosion coating, for example made of nickel and/or tin or an alloy thereof. By means of the contact sleeve, a potential compensation of the aluminum shielding fabric 7 with the earth wire is possible, in which potential compensation the contact sleeve is electrically connected with the earth wire by means of a compensation conductor. The respective other sleeve is configured as a support sleeve and is made of aluminum or an aluminum alloy to reduce corrosion of the aluminum wire.

It goes without saying that any combination of the first and second embodiments is equally suitable for achieving the same technical effect. Geometries different from the geometry of the contact surfaces 2a, 3a shown in the embodiments are also conceivable, if it is possible to achieve a clamping or compression/shearing of the aluminium wires of the aluminium shielding fabric 7.

Fig. 9 shows a third exemplary embodiment of the contacting system according to the invention, in which the inner sleeve 2 rests on the secondary insulation 8 in the contact position. In order to be able to clamp the aluminium shielding fabric 7 between the contact surfaces 2a, 3a, a section of the aluminium shielding fabric 7 is folded back onto the first contact surface 2 a. The outer sleeve 3 can be pushed onto the inner sleeve 2 in the axial direction, i.e. in the direction of the conductor axis 15, in order to be able to achieve clamping or compression/shearing of the aluminum wires of the aluminum shielding fabric 7 between the two contact surfaces 2a, 3 a.

The method for bringing the aluminum shielding fabric 7 into contact with the contact element 1 differs from the method described above in connection with the first two embodiment variants due to the different configuration of the contact system: in a first step, the inner sleeve 2 is pushed over the open end of the electrically conductive cable 4 and over the deinsulated region onto the secondary insulation 8. If the first contact surface 2a (as in the illustrated embodiment) has areas with cross-sections of different sizes, it is advantageous if the area with the smallest cross-section is oriented towards the open end of the cable 4. In the present exemplary embodiment, the contact surfaces 2a, 3a are designed conically as in the first exemplary embodiment and the fourth exemplary embodiment, but it is likewise conceivable for the contact surfaces 2a, 3a to have step portions or a combination of inclined surfaces and step portions, similar to the second exemplary embodiment. In the present exemplary embodiment, the inner sleeve 2 is closed flush with the secondary insulation 8, wherein a left-hand or right-hand offset is also conceivable. The section of the aluminum shielding fabric 7 exposed by the insulation stripping is then folded back onto the first contact surface 2a, so that the aluminum shielding fabric 7 is folded back and placed on the first contact surface 2 a. In a final step, the outer sleeve 3 is then moved from the direction of the open end of the cable 4 towards the inner sleeve 2, so that the aluminum shielding fabric 7 is first clamped between the contact surfaces 2a, 3a and is further compressed or sheared and cold-welded by pressing together in the axial direction. With this design, the conventional methods, in which the folding-over of the aluminum shielding fabric 7 is provided, can be combined in a simple manner with the clamping or cold welding of the aluminum facilitated by the sleeves 2, 3 being moved or pressed into one another.

Fig. 10 shows a fourth embodiment of the contact system according to the invention, which is constructed analogously to the third embodiment described above. In contrast to the previously described exemplary embodiments, the inner sleeve 2 is not placed on the secondary insulation 8 in the contact position, but on the exposed section of the aluminum shielding fabric 7. Therefore, the aluminum shield fabric 7 is exposed or de-insulated over a larger area than the area where it is folded over.

the method for contacting the aluminum shielding fabric 7 is carried out analogously to the method described above, wherein the inner sleeve 2 is pushed just over the exposed section of the aluminum shielding fabric 7 and the section of the aluminum shielding fabric 7 projecting beyond the inner sleeve 2 is folded over onto the first contact surface 2 a. Pushing the outer sleeve 3 up takes place as described before. This configuration enables a particularly space-saving arrangement of the contact elements 1 in the contact position. The abutment of the inner sleeve 2 against the aluminum shielding fabric 7 can only be achieved by the sleeves 2, 3 being moved or pressed into contact with one another in a nested manner according to the invention in order to establish contact, since the aluminum shielding fabric 7 located below the inner sleeve 2 can be damaged during a conventional radial pressing process. In addition to this, the secondary insulation 8 can be used as a stop for positioning the inner sleeve 2.

List of reference numerals

1 contact element

2 inner sleeve

2a first contact surface

3 outer sleeve

3a second contact surface

4 conductive cable

5 inner conductor

6 Primary insulation

7 aluminum shielding fabric

8 Secondary insulation

9 insertion volume

10 insertable segment

11 cable guide passage part

12 bending part

13 first step part

14 second step part

15 axis of conductor