EP3417514A1

EP3417514A1 - Contact system for contacting a braid to a contact element

Info

Publication number: EP3417514A1
Application number: EP17731915.9A
Authority: EP
Inventors: Gottfried Fleischer; Karl Fröschl; Schwent
Original assignee: Gebauer and Griller Kabelwerke GmbH
Current assignee: Gebauer and Griller Kabelwerke GmbH
Priority date: 2017-05-12
Filing date: 2017-06-22
Publication date: 2018-12-26
Anticipated expiration: 2037-06-22
Also published as: EP3422480A1; EP3422481A1; US20210143562A1; WO2018206127A1; EP3422480B1; CN110582894B; CN110582894A; US11362445B2; EP3417514B1; EP3422481B1

Abstract

The invention relates to a contact system for contacting an aluminium braid (7) to a contact element (1) comprising - an electrically conducting cable (4); - the aluminium braid (7) comprising a plurality of aluminium wires, which is arranged to run at least in sections between a primary isolation (6) and a secondary isolation (8) of the electrically conducting cable (4); - the contact element (1) which can be pushed onto the electrically conducting cable (4) having an outer sleeve (3) and an inner sleeve (2) which can be inserted therein. To achieve a contact system which makes possible, in a simple fashion, a reliable contacting of an aluminium braid to a contact element without additional soldering systems being required, according to the invention 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 areas of different size of cross-section and the contact surfaces (2a, 3a) are designed in such a manner that the aluminium braid (7) is clamped in a contact position by the inner sleeve (2) being pushed axially inside the outer sleeve (3) and contact is made with the contact element (1).

Description

CONTACT SYSTEM FOR CONTACTING A VISOR SHEET AND

A CONTACT ELEMENT

FIELD OF THE INVENTION

The invention relates to a contact system for contacting an aluminum braided shield comprising a contact element

an electrically conductive cable with an electrical

Inner conductor, surrounding the electrical inner conductor primary insulation and the Primäri solation surrounding

Secondary isolation;

comprising a plurality of aluminum wires comprising aluminum wires

Braided screen, which is arranged at least partially extending between the primary insulation and the secondary insulation of the electrically conductive cable;

which can be pushed onto the electrically conductive cable

Contact element which se an Außenhül and at least partially in the outer sleeve insertable inner sleeve.

STATE OF THE ART

Electrical cables whose inner conductors carry high voltages require electrical shielding to prevent interference with nearby electrical or electronic components. Similarly, the shield can also be provided to protect the inner conductor against external electrical and / or magnetic interference. For the purpose of shielding a braided shield, which consists of a plurality of strands of an electrically conductive material, is provided which surrounds the electrical inner conductor. The braided shield is usually located within a cable sheath and is between a

Primary insulation, also called inner jacket, which is arranged between the inner conductor and braided shield, and a

Secondary insulation, also called outer sheath or cable sheath, which surrounds the braided shield outside, arranged. In order to increase the shielding effect of the shielding braid can additionally be provided either between the primary insulation and the braided shield or between the braided shield and the secondary insulation, a shielding film, which is usually a plastic-laminated aluminum foil. This screen foil transmits no appreciable currents and is not mitkontaktiert in the case of contacting the screen braid, but separated when exposing the shield braid.

To the shield of the inner conductor or the

To ensure equipotential bonding of the shielding braid, it is necessary that the shielding braid in the end regions of the electrical cable is connectable to a ground. For this purpose, at least one contact element is usually provided at each end of the cable, which are electrically connected to the screen braid and to the ground

can be connected.

Known methods for connecting a braided shield made of copper with a contact element, for example disclosed in DE 10 2015 004 485 B4, are usually realized in that a support sleeve is pushed onto the secondary insulation of the cable and the exposed braided shield is knocked back over the support sleeve. The contact part is then on support sleeve and the resting thereon

Guided screen and for contacting with a

suitable tool radially compressed, for example

crimped. By the pressing process, the braid between support sleeve and contact part is clamped. These methods can only be used on materials with good

Transverse conductivity can be used, since the compression of the shield braid takes place only selectively.

As a conductive material for braided shields are also aluminum or aluminum alloys, which is used due to its low mass in many applications, such as the automotive sector, especially in electrically powered cars. However, if aluminum wires or an aluminum alloy are pressed together, these wires naturally already have only one very hard to penetrate oxide layer on its surface. Due to the radial compression, a contacting process for a braided screen which is customary in copper technology is not capable of contacting all the aluminum wires of the

Aluminum screen mesh with the contact element to produce, as forming on the aluminum wires

Oxide layers the transverse conductivity in the pressed

Prevent areas. Thus, by known methods, the oxide layers can not be broken for all wires in the braided shield. It has also been found that with known contacting methods in aluminum braided shields no stable connection can be achieved over a thermal cycling load. In order to enable the uniform shielding contact with these materials, known connection methods for aluminum braided shields use additional measures to ensure the contacting of all aluminum wires and

if necessary, be able to break the oxide layer.

For example, it is known from DE 10 2012 00 137 B4 that in the connection of an aluminum screen braid with a sleeve, the braided shield is knocked back over the sleeve and the connection is made by means of ultrasonic welding. In this process, via heat supply a

Cohesive connection between screen braid and

Contact part made.

On the one hand, this type of connection technique has the disadvantage that the quality of the connection always influences the quality of the connection, in this case above all adherent ones

Substances from the previous processes Interference factors. On the other hand, the production of such electrically conductive connections between an aluminum braided screen and a contact element is more expensive depending on the presence

Welding systems that are not yet portable and therefore not flexible. OBJECT OF THE INVENTION

It is therefore an object of the invention to overcome the disadvantages of the prior art and to propose a system which in a simple manner a reliable

Contacting an aluminum screen mesh with a

Contact element allows without additional

Welding systems are necessary. PRESENTATION OF THE INVENTION

This object is achieved in a contact system according to the invention for contacting an aluminum screen mesh with a contact element of the type mentioned above in that the inner sleeve having a first contact surface and the outer sleeve has a second contact surface for contacting the aluminum screen mesh, wherein the first and / or second Contact surface each having regions with different sized cross-section with respect to a conductor axis of the electrically conductive cable,

and wherein the contact surfaces are formed such that the aluminum wires of the aluminum screen mesh in a contact position of the contact part by axial

Inserted telescoping of inner sleeve and outer sleeve between the contact surfaces and clamped with the contact part

are contacted.

As electrical inner conductor of electrically conductive material, preferably copper, aluminum or at least one of these metals-containing alloys are understood in the context of the invention both individual conductors as well as several

Single conductors existing strands or a package of two, three, four or more strands, which are covered by the primary insulation. The electrical inner conductor defines a

Conductor axis, which follows the course of the electrical cable, so in sections may be straight, curved or angled. However, at least in the area of the contacting, the conductor axis generally runs in a straight line. Under sleeve is usually understood an element which comprises a, preferably centric, through-opening and a through-opening having, preferably rotationally symmetrical, shell body. The passage opening can basically any geometric

Have cross-section, as long as the implementation of at least a portion of the electrically conductive cable is ensured. The inner sleeve is that sleeve, which in the

Contact position is arranged in the radial direction closer to the inner conductor. In other words, the inner sleeve is pushed onto the electrically conductive cable, so that the

Through opening of the inner sleeve, in the sequence

Called cable duct, advantageously to the

Geometry of the electrical inner conductor of the cable is adapted, for example, circular, elliptical or substantially polygonal. The sheath body of the inner sleeve is such

designed such that the inner sleeve is at least partially inserted into the outer sleeve, wherein the first

Contact surface of the inner sleeve is usually formed by a radially outer peripheral surface of the inner sleeve. in the

In general, the insertability is achieved in that the outer dimensions of the inner sleeve is smaller than or equal to the inner dimensions of the through hole of the outer sleeve. The second contact surface of the outer sleeve is usually from a radially inner peripheral surface, that is from the

Boundary surface of the passage opening of the outer sleeve, formed.

In any case, the contact surfaces are defined by a surface of the inner sleeve or the outer sleeve and theoretically include a volume. If, in the light of the invention, a cross-section of a contact surface is used, this analogously means the cross-section of the enclosed volume which is normal to the conductor axis

is aligned.

In the contact position, the aluminum braid is located between the contact surfaces, so that the

Aluminum wires of the aluminum screen braid, preferably preferably all aluminum wires, both the first

Contact surface as well as the second contact surface. By inventively provided

different sized cross sections at least one of

Contact surfaces of inner sleeve and outer sleeve, which are usually arranged correspondingly in the contact position with each other, are the contact surfaces

contacting aluminum wires of the aluminum shield braid already clamped by axial telescoping of outer sleeve and inner sleeve. Due to the different cross sections, with a circular cross-section these correspond to the diameter, in different areas at least one of

interacting contact surfaces, which areas either continuously or abruptly merge into each other, at least one area is defined, in which at

Pushing the sleeves of the contact surfaces exerted a force acting on the aluminum braid clamping force. Each of the contact surfaces preferably has regions with different sized cross-sections.

Thus, either an electrical contact between the

Outer sleeve and / or the inner sleeve and the aluminum wires made to allow potential equalization. For the choice of the geometry of the cooperative

Contact surfaces of the sleeves comes in a variety of forms in question, as long as through the design of the

Contact surfaces and their cross sections at least one

Area defined by which when pushing the sleeves together one acting on the aluminum shield

Clamping force is exercised.

Under axial telescoping or compressing is understood in the context of the invention that the two sleeves are pushed into each other in the direction of a conductor axis or pressed and not the compression, as known from the prior art, by subsequent radial pressing, for example. Crimping achieved becomes. Thus, a uniform contact between the aluminum wires and the

Contact element already by telescoping the sleeves achieved because the compression is no longer radial or punctiform, but evenly over the contact surface and the aluminum wires running. Although the invention relates to an aluminum screen braid made of aluminum wires is expressly noted that the contact element according to the invention also for

Shield braids made of other materials or alloys, for example, copper or copper alloys is suitable.

To the contact between the aluminum wires of the

To ensure aluminum screen mesh and the contact element in a simple manner, in particular in order to penetrate the oxide layer of the aluminum wires safely, is provided in an embodiment of the invention that the contact surfaces are further formed such that in the contact position of the contact element by axial

Compression of outer sleeve and inner sleeve one

Pinching / shearing of the aluminum wires of the aluminum screen braid and cold welding of the aluminum wires of the aluminum screen braid with the contact element takes place.

The contact between aluminum screen braid and

Contact element is thus achieved in the embodiment that the contact surfaces of the inner sleeve and

Outer sleeve are designed such that the oxide layer having surface as possible all aluminum wires of the aluminum screen braid during axial compression of inner sleeve and outer sleeve is broken, so that a

Cold welding between at least one contact surface and the aluminum braid can arise. To the

Breaking the surface, the aluminum wires are squeezed during compression or at least partially

sheared / sheared off so that it becomes a

Cold welding between the aluminum wires and at least one of the sleeves, so the inner sleeve and / or the outer sleeve comes. By the, preferably mutually corresponding areas of different cross-section of the contact surfaces, at least one area is defined in turn, in which when compressing a pressure peak forms. This

Range usually corresponds to the area in which the clamping force is exerted. A cold-welded state can thus be achieved if the sleeves, for example, starting from the contact position in which the aluminum braided shield is clamped between the contact surfaces, are axially compressed.

In cold welding, the effect is exploited that

Aluminum tends to flow using very high pressure and thereby with contacting materials

can be cold-welded. Such a compound is insoluble and electrically conductive. In other words, by choosing the geometry of the cooperating contact surfaces, taking into account the regions of different sized cross sections

ensured that the oxide layer in the axial

Compressing the sleeves is reliably broken by placing the aluminum wires of the aluminum screen mesh in an area defined by the contact surfaces

squeezed or (sheared) sheared. At the same time, the connection by means of the contact system according to the invention due to the local shear / pinch and the cold welding taking place there is insensitive to superficial contamination of the aluminum shield braid. For the choice of the geometry of

cooperating contact surfaces of the sleeves comes in a variety of forms in question, as long as through the design of the contact surfaces and their areas with

at least one region is defined in which at least one region is defined during axial compression

Pressure peak forms, which can be used to pinch / shear the

Aluminum wires and ultimately leads to cold welding.

As a rule, one of the sleeves is made of copper or one, preferably coated, copper alloy and serves as a contact sleeve while the other sleeve acts as a support sleeve. Advantageously, the cold welding takes place both between the contact sleeve and between the

Support sleeve and the aluminum screen braid instead.

In a further embodiment of the invention it is provided that the second contact surface of the outer sleeve limits an insertion volume for the inner sleeve and the first contact surface of the inner sleeve by a in the

Insertion volume insertable section of the inner sleeve

is trained. The insertion volume of the outer sleeve is usually through a portion of the passage opening,

preferably completely through the passage opening,

educated. By the design of insertion volume of the

Outer sleeve and insertable portion of the inner sleeve can be in a simple manner, the interaction of

Reach contact surfaces.

According to a further embodiment variant of the invention, provision is made for the introduction volume and / or the insertable section to be at least relative to the conductor axis

partially rejuvenate. By the taper of at least one, preferably both, the contact surfaces

forming element (s) is achieved in a simple manner, a geometry of the contact surfaces, which a

Clamping or crushing / shearing causes the aluminum screen braid in the contact position. In the tapered portion of that region forms, which exerts a clamping force on the aluminum wires or a

Crushing / shearing of the aluminum wires causes. It goes without saying that two, three, four or more tapered sections can be provided. In other

In words, the contact surfaces may be formed such that in an intermediate position of the contact part, in which the inner sleeve is partially inserted into the outer sleeve, forms a gap for receiving the aluminum screen mesh between the contact surfaces and the gap has at least one cross-sectional constriction.

A particularly space-saving design of the contact element is in a preferred embodiment thereof ensures that the inner sleeve is completely received in the contact position of the outer sleeve in the contact position. In other words, the entire inner sleeve is formed as an insertable section.

In order to be able to produce and define the areas with different sized cross-section in the contact surfaces in a simple manner, is in another

Embodiment variant of the invention provided that the first and / or the second contact surface are formed at least partially oblique to the conductor axis in the contact position. In other words, the imaginary extensions of the first and / or second contact surfaces intersect the conductor axis.

In a particularly simple manner, a clamping and / or a compression / shearing of the aluminum wires of the aluminum screen mesh between the contact surfaces in a preferred embodiment can be achieved in that the first and / or the second contact surface is conical. Due to the taper, which usually refers to the conductor axis, the at least one

Contact surface, preferably both contact surfaces, it is achieved that the contact surfaces by an axial displacement of the sleeves in the contact position exert a clamping force on the aluminum wires or a pressure spike for crushing / shearing (ie cold welding) of the

Training aluminum wires. It goes without saying that the contact surfaces are formed corresponding to each other, at least when both contact surfaces are conical.

An increase in the clamping force or a particularly efficient definition of a region in which a cold welding is generated, in another preferred

Embodiment variant achieved in that the first and the second contact surface are conical, wherein the opening angle of the cones at least partially

are different in size. Due to the different Opening angle relative to the conductor axis occurs when pushing axially together on the one hand to an increase in the clamping force in that area in which the clear distance between the contact surfaces is minimal. On the other hand, this can define an area between the contact surfaces, in which a pressure peak forms during the compression of the sleeves. Because of this pressure spike, shear / crushing of the aluminum wires to form the cold weld can be achieved.

The effects mentioned above in connection with the conical contact surfaces can be further improved in that the first and / or the second contact surface has at least one kink. Under kink is the change in slope in the cone or truncated cone

Contact surface understood or said differently the continuous transition between two merging sections with different opening angles of the contact surface. Each kink defines a circumferential contact edge on which a pressure peak is formed and / or which one

Clamping force exerts on the aluminum screen mesh. Advantageous effects are already observed if only one of the contact surfaces has a kink. However, variants are also conceivable in which a contact surface has several kinks or both contact surfaces have one or more kinks. The kinks in turn define the area in which in the contact position, the clamping force is exerted on the aluminum wires or in the

Contact position forms the pressure peak.

As a further possibility to achieve clamping and / or crushing / shearing of the aluminum wires of the aluminum screen mesh between the contact surfaces of the sleeves, is in a particularly preferred

Embodiment variant of the invention provided that the first and / or the second contact surface has at least one stage. Below a level becomes an erratic

Magnification or reduction of the corresponding

Contact surface defining cross-sectional area normal understood the conductor axis. Such a configuration can be with any geometric shape of

Combining contact surfaces, for example, the first and / or second contact surface may have a cylindrical shape or the conical shape described above. It is advantageous if both contact surfaces to each other

have corresponding first and second stages. By the at least one first and / or second stage, in turn, the area is defined in which in the contact position, the pressure peak for exerting the clamping force or for

Crushing / shearing and cold welding of the aluminum wires of the aluminum screen mesh forms. There are already observed beneficial effects, if only one of

Contact surfaces has a step. However, variants are also conceivable in which a contact surface has several stages or both contact surfaces have one or more stages.

In order to enhance the advantages mentioned above in connection with the stages, according to a further particularly preferred embodiment of the invention, it is provided that the

first contact surface at least a first stage and the second contact surface at least a second stage

each having a peripheral

Forming contact edge and the aluminum screen mesh is contacted in the contact position of the contact edges. The contact edges in turn defines that region in which the pressure peak is in the contact position

Exercise the clamping force or for crushing / shear and

Cold welding of the aluminum wires of the aluminum screen mesh forms.

It is advantageous for equipotential bonding if one of the

Sleeves is designed as a contact sleeve, via which the

Potential equalization is made possible and the other sleeve is designed as a support sleeve. In order to achieve good connection properties between the aluminum wires of the aluminum screen braid and the contact sleeve it is special

advantageous if the contact sleeve made of copper or a Copper alloy is made. Depending on the application, either the inner sleeve or the outer sleeve may be formed as a contact sleeve. It is also conceivable that both

Contact sleeve and support sleeve made of copper or a

Copper alloy are made. Therefore, in further

Embodiments of the invention provided that the

Inner sleeve and / or the outer sleeve is made of copper or a copper alloy. Particularly good clamping properties or

Cold welding properties and electrical

Line properties will be in another

Embodiment achieved in that one of the sleeves is made of copper or a copper alloy and the other sleeve made of aluminum or a

Aluminum alloy is made. By the made of aluminum or an aluminum alloy sleeve, so as the

Support sleeve formed sleeve is further the

Corrosion tendency of the aluminum wires in the area of the

Contact element minimized. In order to achieve a particularly high strength of the support sleeve, it can also be made of stainless steel, which is preferably protected against corrosion, for example by means of a corrosion-inhibiting coating.

To the corrosion properties of the made of copper or a copper alloy sleeve, preferably the

Contact sleeve to improve and reduce the tendency of the aluminum wires to corrode, is provided in a further particularly preferred embodiment of the invention that the made of copper or a copper alloy sleeve has a corrosion-inhibiting coating. For such a corrosion-inhibiting coating are suitable

in particular nickel and / or tin or nickel and / or tin-containing alloys as coating materials.

That's between primary insulation and secondary insulation

arranged to contact aluminum screen braid with the contact element, it is usually necessary that Cut cable and strip the aluminum screen braid at an open end of the cable, so at least to remove the secondary insulation, and to position the inner sleeve relative to the electrical conductor. It is therefore provided in a further embodiment of the invention that the secondary insulation at least in that area of the

electrically conductive cable is removed, in which the

Contact element is arranged in the contact position, wherein the smallest cross-section of the first contact surface having region adjacent to the secondary insulation having region of the cable.

While it is known in the art that the contact element in the contact position on the

Secondary insulation of the cable sits and the braided screen is folded back over the contact element to pass through the

subsequent radial compression or welding the

Not to damage inner conductor, it is through the

However, the inventive design of inner sleeve and outer sleeve possible, the contact element saving space in

stripped area of the cable, so in that area in which the secondary insulation is removed to arrange. The reason for this is that the clamping or cold welding only by telescoping or axial

Compression of inner sleeve and outer sleeve is achieved and thus there is no risk that the inner conductor is injured by the axial compression of the sleeves. Preferably, the inner sleeve is inserted between the primary insulation and the aluminum braided shield, so that the inner sleeve, on the one hand, contacts the primary insulation and, on the other hand, the aluminum braided screen. Therefore, in a further preferred embodiment of the invention, it is provided that the inner sleeve in the contact position between the

Primary insulation and the aluminum screen mesh is arranged, preferably a cable bushing of the inner sleeve contacts the primary insulation. Thus, both inner sleeve and outer sleeve or at least their

Contact surfaces in the radial direction in the stripped

Area of the cable. In a further embodiment variant of the invention, it is provided that the aluminum braided screen is folded over the first contact surface of the inner sleeve and a cable bushing of the inner sleeve contacts the secondary insulation or the aluminum braided screen. If the inner sleeve sits in the contact position on the secondary insulation and thus the cable bushing, that is the through hole, the inner sleeve contacts the secondary insulation, the

Aluminum braided shield to be contacted over the first contact surface for contacting. A special

Space-saving construction is achieved by the fact that the

Inner sleeve in the stripped area of the cable over the

Aluminum screen braid is pushed and then the

Aluminum braid is folded over the first contact surface. The cable gland contacts the section of the aluminum screen braid adjacent to the primary insulation and the first contact surface

recoiled part of the aluminum screen braid.

The object mentioned above is also achieved by a method for contacting one of aluminum wires

formed, an electrical inner conductor of an electrically conductive cable surrounding aluminum shield braid and a contact element,

wherein the contact element has an inner sleeve with a first contact surface and an outer sleeve with a second

Contact surface includes, taking the following steps

be performed:

- if necessary, remove a section of the

Aluminum screen braid surrounding secondary insulation and / or a portion of a surrounding inner conductor

Primary insulation in the area of an open end of the

electric cable;

- If necessary, sliding the inner sleeve and outer sleeve onto the electrically conductive cable;

Placing the inner sleeve between the aluminum braided shield and the inner conductor, wherein the aluminum braided shield abuts against the first contact surface; Moving the outer sleeve in the direction of the inner sleeve in a contact position of the contact part in which the second

Contact surface of the outer sleeve contacts the aluminum screen braid and the aluminum wires of the aluminum screen braid is clamped between the contact surfaces.

In this case, first the electrically conductive cable is cut to length and a resulting open end of the cable stripped, wherein the stripping at least the secondary insulation is removed in that or up to that area in which the contact with the contact element is to be produced. It goes without saying that even an already cut cable with stripped open end can be used.

Subsequently, inner sleeve and outer sleeve are pushed onto the cable, wherein the cable through the passage opening of the sleeves, respectively insertion volume and cable gland, is performed. However, it is also conceivable that the electrical cable is already delivered prefabricated, so outer sleeve and inner sleeve only pushed together or

must be pressed together.

If the contact element is to be arranged in the contact position in the non-stripped region of the cable, it is necessary to first postpone the inner sleeve on the secondary insulation, then turn over the aluminum braid on the secondary insulation or on the inner sleeve and subsequently the outer sleeve from the direction of the stripped

Move the area of the cable towards the inner sleeve. In other words, the inner sleeve between the

Secondary insulation and the folded back portion of the aluminum screen braid placed. According to a further embodiment of the invention, it is therefore provided that first the inner sleeve is pushed over the secondary insulation and subsequently the aluminum braided shield is folded over the first contact surface before the outer sleeve is displaced in the direction of the inner sleeve. In this case, the outer sleeve from the direction of the open end of the cable in Direction of the secondary insulation having portion of the electrically conductive cable to move in the

Contact position to be brought. But if the contact element in the contact position in

space-saving manner should be arranged in the stripped region of the cable, as in a preferred

Embodiment variant of the invention is provided, the outer sleeve is first pushed onto the secondary insulation of the cable. The inner sleeve is subsequently between the

Primary insulation and the aluminum shield braid inserted so that no turning of the aluminum shield braid is necessary. Subsequently, the outer sleeve in

Direction of the stripped portion of the cable or pushed in the direction of the inner sleeve. According to another

Embodiment of the invention is therefore intended that first the outer sleeve is pushed over the secondary insulation and subsequently the inner sleeve between the aluminum braided shield and primary insulation is inserted before the outer sleeve is moved in the direction of the inner sleeve. At this time, the outer sleeve is shifted from the portion of the electric wire having the secondary insulation toward the open end of the cable to be brought into the contact position.

It is particularly space-saving, if the inner sleeve in

stripped area is pushed directly onto the applied to the primary insulation aluminum braid and the aluminum braided shield in the stripped area of

electrically conductive cable is folded over the first contact surface. The aluminum braided screen is exposed so far that a section over the deferred inner sleeve projects and can be turned over. Subsequently, the outer sleeve is then in the direction of the secondary insulation having region of the electrically conductive cable

postponed. According to a further embodiment of the

The invention is therefore intended that first the inner sleeve is pushed over the aluminum braided shield and

below a protruding over the inner sleeve section the aluminum shield braid is turned over the first contact surface before the outer sleeve in the direction of

Inner sleeve is moved. In this case, the outer sleeve from the direction of the open end of the cable in the direction of the secondary insulation having region of the electric

conductive cable moved to the contact position

to be brought.

In any case, in all the variants mentioned above,

optionally with the interposition of the primary insulation and / or the secondary insulation, the inner sleeve placed in the radial direction between the inner conductor and braided shield placed.

By the axial telescoping of outer sleeve and

Inner sleeve, the aluminum wires of the aluminum screen braid between the contact surfaces are clamped, as described in detail in the context of the contact system in detail. To the contact between the aluminum wires of the

To ensure aluminum screen braid and the contact element in a simple manner, in particular in order to be able to penetrate the oxide layer of the aluminum wires safely, is provided in a variant of the method according to the invention that further following method step

is carried out:

Continue moving and pressing the outer sleeve in the direction of the inner sleeve so by the pressurization of the

Contact surfaces a bruise / shear of

Aluminum wires of aluminum screen braid and

Cold welding of the aluminum wires of the aluminum screen braid takes place at the contact surfaces of the contact element.

It is particularly advantageous if a system according to the invention is used in combination with a method according to the invention or if a system according to the invention can be produced by a method according to the invention. BRIEF DESCRIPTION OF THE FIGURES

The invention will now be explained in more detail with reference to exemplary embodiments. The drawings are exemplary and are intended to set forth the inventive idea, but under no circumstances

narrow down or even finish playing.

Showing:

Fig. 1 is a sectional view of an inventive

Contact system in a contact position;

Fig. 2 is an axonometric view of the contact system in the

Contact position;

Fig. 3 is an axonometric view of a first

Embodiment of the contact system in an intermediate position;

Fig. 4 is an axonometric view of a second

Embodiment of the contact system in an intermediate position;

5 is an enlarged detail view of a contact element of the first embodiment;

6 is an enlarged detail view of a contact element of a second embodiment;

Fig. 7a, b, c, d are sectional views of the first embodiment in several successive positions; Fig. 8a, b, c, d are sectional views of the second

Embodiment in several successive positions;

9 is a sectional view of a third embodiment ^¬ example of the contact system in the contact position. 10 is a sectional view of a fourth embodiment ^¬ example of the contact system in the contact position.

WAYS FOR CARRYING OUT THE INVENTION

Figures 1 and 2 show the basic structure of a contact system according to the invention for contacting a

Aluminum screen mesh 7 with a contact element 1. The aluminum screen braid 7 comprises a variety of

Aluminum wires and runs between a primary insulation and a secondary insulation 8 of an electrically conductive

Cable 4. The structure of the cable 4, which can be seen in particular in Figures 2 and 4, looks like this: The core of the cable 4 is by an electric

Inner conductor 5 is formed, which defines a rectilinear conductor axis 15 in the figures. In the present figures, the inner conductor 5 is formed by a plurality of individual conductors bundled as a strand and has a substantially circular cross-section. It goes without saying that the number of individual conductors of a strand and the number of strands or the geometry of the

Cross-section are irrelevant to the invention itself.

Basically, therefore, for example, both individual conductors as well as elliptical or polygonal cross sections of

Inner conductor 5 conceivable. On the inner conductor 5 is a

Primary insulation 6, also called inner sheath or conductor insulation, applied, which provides an insulation between the

Inner conductor 5 and the aluminum screen mesh 7 causes. On the aluminum braid 7 is then a

Secondary insulation 8, also outer sheath or cable sheath

called, applied, which inner conductor 5 and aluminum screen braid 7 isolated from the environment. Before the contacting of the aluminum screen mesh 7 and the contact element 1 can be realized, usually the electrically conductive cable 4 must be cut to length, so that an open end of the cable 4 is formed. In that area of the electrically conductive cable 4, in which the

Contact element 1 can be arranged in the contact position, the secondary insulation 8 is removed. In the following, therefore, in this context, the stripped area is spoken. In general, the stripped portion is disposed in the portion of the open end of the cable 4 and extends, as shown in the figures, to the end of the cable 4. Furthermore, as can be seen in the figures, also

end portion of the cable 4 of primary insulation 6, aluminum screen braid 7 and secondary insulation 8 freed be so that the inner conductor 5 is exposed for electrical connection.

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 for contacting the aluminum screen braid 7 in the illustrated contact position

are formed. The inner sleeve 2 is at least

partially inserted into the outer sleeve 3. At least one of the two sleeves 2, 3 is designed as a contact sleeve and for the purpose of equipotential bonding with a ground

electrically connectable. Since the contact surfaces 2a, 3a of the sleeves 2, 3 are such

are formed such that the aluminum wires of the aluminum screen mesh 7 in the contact position of the contact part 1 by axial telescoping of inner sleeve 2 and

Outer sleeve 3 between the contact surfaces 2a, 3a clamped and contacted with the contact part 1, the aluminum braided shield 7 is clamped in the illustrated contact position between the contact surfaces 2a, 3a. Furthermore, the contact surfaces 2 a, 3 a in the exemplary embodiments are also designed such that in the contact position of the

Contact element 1 by axial compression of

Outer shell 3 and inner sleeve 2 a crushing / shearing of the aluminum wires of the aluminum screen mesh 7 and

Cold welding of the aluminum wires of the aluminum screen braid 7 takes place with the contact element 1. This configuration is achieved in that the contact surfaces 2a, 3a have regions of different cross-section, in the present case of different diameters. Therefore, the electrical connection between the aluminum wires of the

Aluminum shield braid 7 and the contact element 1 in the illustrated contact position made by cold welding. In other words, the aluminum wires are welded in the contact position with the contact element 1. In principle, the contact surfaces 2 a, 3 a surrounding the aluminum screen mesh 7 are in any case one

uniform contacting of all possible aluminum wires achieved without a radial compression, such as crimping, or that an additional welding is necessary.

However, the electrical contact by simply pushing together or compressing the sleeves 2.3

producible. On two possible geometric configurations of

Contact surfaces 2a, 3a, which achieve the two effects mentioned above will be discussed in detail below.

FIG. 3 shows an axonometric view of a first one

Embodiment of the system according to the invention in one

Intermediate position in which the contact surfaces 2a, 3a of the sleeves 2.3 are not yet in contact with the aluminum screen braid 7. It can be seen clearly that the first contact surface 2a of the inner sleeve 2 is conical, so that the size of the cross sections or diameter normal to the conductor axis 15 along the entire longitudinal extent of the sleeves 2.3 change. In other words, both contact surfaces 2a, 3a run obliquely to the

Head axis 15. It can also be seen that the

Contact surface 2a two sections different

Slope, which merge into one another at a kink 12. In this case, the contact surface 2a in a first, in the present illustration of the outer sleeve 3 facing portion on a larger opening angle, is therefore steeper than in the second section.

FIG. 4 shows an axonometric view analogous to FIG. 3 of a second exemplary embodiment of the invention

Systems in the intermediate position. Here it can be seen that the first contact surface 2a of the inner sleeve 2 of three

cylindrical sections of different size cross-section or diameter is composed, wherein two first stages 13 each separate two successive sections from each other. In Figure 5 is a contact element 1 of the first

Embodiment, in Figure 6, a contact element 1 of the second embodiment, that is, in each case the inner sleeve 2 and the outer sleeve 3, shown in detail. It can be seen immediately that inner sleeve 2 and outer sleeve 3 each have a through opening and that the

Inner sleeve 2 at least partially in the outer sleeve 3 can be inserted. The passage opening of the inner sleeve 2 is formed as a cable bushing 11, through which the cable 4 is feasible. The first contact surface 2a of the inner sleeve 2 is formed by an outer peripheral surface of the inner sleeve 2

educated .

The passage opening of the outer sleeve 3 is as

Insertion volume 9 for receiving an insertable portion 10 of the inner sleeve 2 is formed and further serves for

Carrying out the cable 4. In the present embodiment, the insertable section 10 comprises the entire extension of the inner sleeve 2, so that the inner sleeve 2 in the

Contact position is completely absorbed in the outer sleeve 3. In alternative embodiments, it is also conceivable that the insertable section 10 only part of the

Longitudinal extent of the inner sleeve 2 includes, so that a part of the inner sleeve 2 protrudes in the contact position of the outer sleeve 3 also. The second contact surface 3a is formed by an inner peripheral surface of the outer sleeve 3a and limits the insertion volume 9. In both embodiments, it can be seen that the

Geometry of the first contact surface 2a with the second contact surface 3a corresponds, insofar as that

between the contact surfaces 2 a, 3 a, the aluminum screen braid 7 is clamped or kaltverschweißbar.

In Figure 5, the previously in connection with the first

Embodiment described conicity of the first

Contact surface 2a again shown kink 12 inclusive.

Next to that is the conical training of the second one Contact surface 3a of the outer sleeve 3 can be seen. In the present embodiment, the differ

Opening angle of the cones of the contact surfaces 2a, 3a

from each other, so that when inserting the inner sleeve 2 in the outer sleeve 3 and when pushing the outer sleeve 3 on the inner sleeve 2, a wedge-shaped cross-sectional constriction is achieved. By the bend 12 that area is defined in which of the contact surfaces 2a, 3a a clamping force on the

Aluminum wires is exercised or in which a

Pressure peak for crushing / shearing and cold welding of the aluminum wires is formed. The area is thus a circumferential one defined by the kink

Contact edge.

By contrast, in FIG. 6, the first steps 13 of the first contact surface 2 a described above in connection with the second embodiment variant can be seen. Now, the second contact surface 3a is also shown, which has with the first stages 13 cooperating second stages 14, which divides the second contact surface 3a in three sections. When inserting the inner sleeve 2 into the outer sleeve 3 or when sliding the outer sleeve 3 onto the inner sleeve 2, a wedge-like cross-sectional constriction is again achieved by the interaction of the steps 13, 14. In other words, the range is defined by the stages 13,14, in which of the

Contact surfaces 2a, 3a a clamping force on the

Aluminum wires is exercised or in which a

Pressure peak for crushing / shearing and cold welding of the aluminum wires is formed. In this embodiment, a circumferential contact edge is formed by each of the stages 13, 14, which constitutes the above-mentioned range.

Figures 7a, b, c, d and 8a, b, c, d show different

Positions of the contact element 1 and the inner sleeve 2 and the outer sleeve 3 during the contacting process, wherein in the former figures, a system according to the first

Embodiment and in the latter figures, a system according to the second embodiment is shown. In a first step (to be seen in FIGS. 7a, 7b or 8a, 8b), the outer sleeve 3 is pushed onto the electrically conductive cable 4 in each case. The outer sleeve 3 is thereby pushed beyond the stripped area, so that the outer sleeve 3 comes to rest over the secondary insulation 8. Around

to be able to ensure that the outer sleeve 3 on the

Secondary insulation 8 is pushed, is the smallest

Diameter of its passage opening is greater than or equal to the diameter of the cable 4 together with secondary insulation 8. In other words, the cable 4 is partially received in the insertion volume 9 of the outer sleeve 3.

The second step (shown in FIGS. 7b, 7c and 8b, 8c) is that the inner sleeve 2 is pushed onto the electrically conductive cable 4. In this case, the smallest diameter of the cable bushing 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 Figures 7c and 8c is the

Inner sleeve 2 inserted between the primary insulation 6 and the aluminum screen braid 7, so that the aluminum braid 7 contacts the first contact surface 2a. It is also conceivable that the aluminum braided screen 7 is lifted in a separate step from the primary insulation 6 and after pushing the inner sleeve 2 is placed on the first contact surface 2a, for example by means of the step described below or in a separate step.

In the last step, the outer sleeve 3 is then displaced in the direction of the inner sleeve 2 until in the contact position the second contact surface 3a and the first contact surface 2a contact the aluminum braided shield 7 and the

Aluminum wires of the aluminum screen mesh 7 between the contact surfaces 2 a, 3 a are clamped and the electrical contact between the contact element 1 and the aluminum screen mesh 7 is made. In this case, defined in the first embodiment, the wedge-shaped taper or the Kink 12 and in the second embodiment, the stages 13,14 that portion of the contact surfaces 2a, 3a, in which in the contact position, the clamping force is exerted on the aluminum screen braid 7.

Upon further compression of inner sleeve 2 and

Outer sleeve 3 form at the bend 12 or at the steps 13,14 (ie at the peripheral contact edges) pressure peaks, which first to a compression and further

Compressing to an at least partial crushing or shearing, preferably a complete shearing, the lead aluminum wires, so that a cold welding of the aluminum wires of the aluminum screen braid 7 with the

Contact element 1 takes place. By squeezing or shearing the aluminum wires, the oxide layer having the

Broken surface of the aluminum wires and thus broken the oxide layer and a re-education of the

Protected oxide layer, so that a change temperature resistant, good conductive electrical connection between the aluminum shield braid 7 and the contact element 1 is ensured when the aluminum wires after compression in the

Contact position with the contact element 1 are cold-welded.

As a rule, one of the two sleeves 2, 3, that is to say either the inner sleeve 2 or the outer sleeve 3, is in the form of a contact sleeve

formed, which is made of copper or a copper alloy, and preferably a corrosion-inhibiting

Coating, such as nickel and / or tin or alloys thereof. About this contact sleeve is the

Equipotential bonding of the aluminum shield braid 7 with a mass possible in which the contact sleeve by means of a

Equalizing conductor is electrically connected to the ground. The other sleeve is formed as a support sleeve and is made of aluminum or an aluminum alloy to reduce the corrosion of the aluminum wires.

It goes without saying that any combination of the first and second embodiments are also suitable for achieving the same technical effects. Also are from the geometry of the contact surfaces 2 a, 3 a shown in the exemplary embodiments deviating geometries conceivable, if they a clamping or compression / shearing the

Alloy aluminum screen braid 7 aluminum wires.

FIG. 9 shows a third exemplary embodiment of the invention

mapped contact system according to the invention, in which the inner sleeve 2 in the contact position on the

Secondary insulation 8 sits. In order to be able to clamp the aluminum braided screen 7 between the contact surfaces 2a, 3a, a section of the aluminum screen braid 7 has been pushed back over the first contact surface 2a. The outer sleeve 3 is in the axial direction, ie in the direction of the conductor axis 15, pushed onto the inner sleeve 2 to the clamping or

Compression / shearing of the aluminum wires of the aluminum screen braid 7 between the two contact surfaces 2a, 3a to allow.

The method for contacting the aluminum screen braid 7 with the contact element 1 differs from those previously described in connection with the first two due to the different structure of the contact systems

Embodiment described methods: In a first step, the inner sleeve 2 is on the open end of the

pushed electrically conductive cable 4 and pushed over the stripped area away on the secondary insulation 8. If the first contact surface 2a - as in the illustrated embodiment - areas with

it is different in cross-section

advantageous if the region with the smallest cross-section is directed towards the open end of the cable 4. In the present embodiment, the

Contact surfaces 2a, 3a as in the first and in the fourth

Embodiment conical, but it is also conceivable that the contact surfaces 2a, 3a have analogously to the second embodiment stages or a combination of slopes and steps. In the present embodiment, the inner sleeve 2 is flush with the secondary insulation 8, wherein also a left-side or right-side offset is conceivable. Subsequently, an exposed by the stripping portion of the aluminum screen mesh 7 is folded over the first contact surface 2a, so that the

Aluminum shield braid 7 is folded back and rests on the first contact surface 2a. In the last step, the outer sleeve 3 is then displaced from the direction of the open end of the cable 4 in the direction of the inner sleeve 2, so that the aluminum braid 7 first between the

Contact surfaces 2a, 3a clamped and further compacted by axial compression and cold-welded. By such a configuration can be

Conventional methods in which a turning of the aluminum screen braid 7 is provided, in a simple manner with the advantageous for aluminum clamping or

Cold welding by telescoping or

Compress the sleeves 2.3 together.

FIG. 10 shows a fourth exemplary embodiment of the invention

contact system according to the invention, which is constructed similar to the third embodiment described above. In this case, the inner sleeve 2 is seated in the contact position, in contrast to the previously described embodiment not on the secondary insulation 8, but on an exposed portion of the aluminum screen mesh 7. The aluminum screen mesh 7 is thus over a larger area

exposed or stripped when it is turned over.

The method for contacting the aluminum screen braid 7 is carried out analogously to the method described above, wherein the inner sleeve 2 is just pushed onto the exposed portion of the aluminum screen braid 7 and over the inner sleeve 2 projecting portion of the

Aluminum screen braid 7 over the first

Contact surface 2a is turned over. The sliding of the outer sleeve 3 is carried out as previously described. The like

Design allows a particularly space-saving arrangement of the contact element 1 in the contact position. Only by the telescoping or pressing together of the sleeves 2.3 for making the contact is a resting the inner sleeve 2 on the aluminum screen braid 7 allows, as lying under the inner sleeve 2 aluminum screen braid 7 could be injured in conventional radial pressing operations. In addition to this, the

Secondary insulation 8 as a stop for positioning the

Inner sleeve 2 can be used.

REFERENCE LIST Contact element

inner sleeve

a first contact surface outer sleeve

a second contact surface electrically conductive cable

inner conductor

primary insulation

Aluminum braided shield

Secondary insulation

Einführvolumen

insertable section

Grommet

kink

first stage

second step

conductor axis

Claims

1. Contact system for contacting an aluminum screen braid (7) with a contact element (1)

full

an electrically conductive cable (4) with an electrical inner conductor (5), a primary insulation (6) surrounding the electrical inner conductor (5) and a surrounding primary insulation (6)

Secondary insulation (8);

the aluminum screen braid (7) comprising a plurality of aluminum wires and arranged at least in sections between the primary insulation (6) and the secondary insulation (8) of the electrically conductive cable (4);

that on the electrically conductive cable (4)

Slidable contact element (1), which a

Outer sleeve (3) and at least partially in the outer sleeve (3) insertable inner sleeve (2),

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 screen mesh (7)

exhibit,

wherein the first (2a) and / or second contact surface (2a, 3a) regions with different sized cross-section relative to a conductor axis (15) of the electrically

having conductive cable (4),

and wherein the contact surfaces (2a, 3a) are so

are formed so that the aluminum wires of the aluminum screen braid (7) in a contact position of the

Contact part (1) by axial telescoping of inner sleeve (2) and outer sleeve (3) between the Contact surfaces (2a, 3a) clamped and with the

Contact part (1) are contacted.

Contact system according to claim 1, characterized in that the contact surfaces (2a, 3a) are further formed such that in the contact position of the

Contact element (1) by axially compressing the outer sleeve (3) and inner sleeve (2) a

Squeezing / shearing of the aluminum wires of the aluminum screen braid (7) and cold welding of the

Aluminum wires of the aluminum shield braid (7) with the contact element (1) takes place.

Contact system according to one of claims 1 to 2, characterized in that the second contact surface (3a) of the outer sleeve (3) has an insertion volume (9) for the

Inner sleeve (2) limited and the first

Contact surface (2a) of the inner sleeve (2) by a in the insertion volume (9) insertable portion (10) of the inner sleeve (2) is formed.

Contact system according to claim 3, characterized in that insertion volume (9) and / or insertable

Section (10) with respect to the conductor axis (15) at least partially taper.

Contact system according to one of claims 3 to 4, characterized in that the inner sleeve (2) in the

Contact position is completely in the insertion volume (9) of the outer sleeve (3) is added.

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

Contact system according to one of claims 1 to 7, characterized in that the first (2a) and the second

Contact surface (3a) are conical, wherein the opening angle of the cones are at least partially different sizes.

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

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

Contact system according to one of claims 1 to 10, characterized in that the first contact surface (2a) at least a first stage (13) and the second

Contact surface (3a) at least one second stage (14), wherein the steps (13,14) each have a

form circumferential contact edge and the aluminum screen mesh (7) in the contact position of the

Contact edges is contacted.

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

Contact system according to one of claims 1 to 12, characterized in that one of the sleeves (2,3) is made of copper or a copper alloy and the respective other sleeve (3,2) made of aluminum or a

Aluminum alloy or stainless steel is made. Contact system according to one of claims 12 to 13, characterized in that the copper or a

Copper alloy manufactured sleeve (2,3) a

having corrosion-inhibiting coating.

Contact system according to one of claims 1 to 14, characterized in that the secondary insulation (8) is at least in that region of the electrically conductive cable (4) is removed, in which the contact element (1) is arranged in the contact position,

where the smallest cross section of the first

Contact surface (2a) having region adjacent to the secondary insulation (8) having region of the cable (4).

Contact system according to one of claims 1 to 15, characterized in that the inner sleeve (2) in the

Contact position between the primary insulation (6) and the aluminum braid (7) is arranged.

Contact system according to one of claims 1 to 14, characterized in that the aluminum braided shield (7) over the first contact surface (2a) of the inner sleeve (2) is folded over and a cable bushing (11) of the inner sleeve (2) the secondary insulation (8). or that

Aluminum braided shield (7) contacted.

Method for contacting an aluminum screen braid (7) formed of aluminum wires and surrounding an electrical inner conductor (5) of an electrically conductive cable (4) with a contact element (1),

wherein the contact element (1) has an inner sleeve (2) with a first contact surface (2a) and a

Outer sleeve (3) with a second contact surface (3a) for contacting the aluminum screen braid (7),

wherein the first (2a) and / or the two contact surfaces (3a) regions of different sized cross-section has a conductor axis (15) of the electrically conductive cable (4),

and wherein the following steps are performed:

optionally removing a portion of the aluminum screen braid (7) surrounding

Secondary insulation (8) and / or a portion of a primary insulation (6) surrounding the inner conductor (5) in the region of the open end of the electric cable (4);

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

Placing the inner sleeve (2) between the aluminum braided shield (7) and inner conductor (5), wherein the

Aluminum screen braid (7) at the first

Contact surface (2a) is applied;

Move the outer sleeve (3) in the direction of

Inner sleeve (2) in a contact position of

Contact part (1) in which the second contact surface (3a) of the outer sleeve (3) contacts the aluminum screen braid (7) and the aluminum wires of the aluminum screen braid (7) between the

Contact surfaces (2a, 3a) is clamped.

19. The method according to claim 18, characterized in that

the following process step is carried out further:

Continue moving and pressing the outer sleeve (3) in the direction of the inner sleeve (2) so that through the

Pressurization of the contact surfaces (2a, 3a) a crushing / shearing of the aluminum wires of the aluminum screen braid (7) and cold welding of the

Aluminum wires of the aluminum screen braid (7) on the contact surfaces (2a, 3a) of the contact element (1) takes place.

20. The method according to any one of claims 18 to 19, characterized

in that first the outer sleeve (3) is pushed over the secondary insulation (8) and subsequently the Inner sleeve (2) between aluminum braided shield (7) and primary insulation (6) is inserted before the

Outer sleeve (3) in the direction of the inner sleeve (2) is moved.

Method according to one of claims 18 to 19, characterized in that first the inner sleeve (2) is pushed over the secondary insulation (8) and subsequently the aluminum braided shield (7) over the first

Contact surface (2a) is turned before the

Outer sleeve (3) in the direction of the inner sleeve (2) is moved.

Method according to one of claims 18 to 19, characterized in that first the inner sleeve (2) is pushed over the aluminum braided shield (7) and

Subsequently, a section of the aluminum screen braiding (7) projecting beyond the inner sleeve (2) is folded over the first contact surface (2a) before the outer sleeve (3) is displaced in the direction of the inner sleeve (2).

Method according to one of claims 18 to 22, characterized in that a system for contacting according to one of claims 1 to 17 for the preparation of

Cold welding connection is used.