EP3422480B1 - Système de contact destiné à la mise en contacte d'un tressage de blindage et d'un élément de contact - Google Patents

Système de contact destiné à la mise en contacte d'un tressage de blindage et d'un élément de contact Download PDF

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Publication number
EP3422480B1
EP3422480B1 EP18190109.1A EP18190109A EP3422480B1 EP 3422480 B1 EP3422480 B1 EP 3422480B1 EP 18190109 A EP18190109 A EP 18190109A EP 3422480 B1 EP3422480 B1 EP 3422480B1
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EP
European Patent Office
Prior art keywords
contact
braided shield
inner sleeve
sleeve
aluminum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18190109.1A
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German (de)
English (en)
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EP3422480A1 (fr
Inventor
Gottfried Fleischer
Karl Fröschl
Michael SCHWENT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gebauer and Griller Kabelwerke GmbH
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Gebauer and Griller Kabelwerke GmbH
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Publication of EP3422480A1 publication Critical patent/EP3422480A1/fr
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Publication of EP3422480B1 publication Critical patent/EP3422480B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0524—Connection to outer conductor by action of a clamping member, e.g. screw fastening means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
    • H01R4/5083—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using a wedge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
    • H01R4/5016—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using a cone
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors

Definitions

  • the invention relates to a contact system for contacting an aluminum braided shield with a contact element an electrically conductive cable with an electrical inner conductor, a primary insulation surrounding the electrical inner conductor and a secondary insulation surrounding the primary insulation;
  • the aluminum braided screen comprising a plurality of aluminum wires, which is arranged to run at least in sections between the primary insulation and the secondary insulation of the electrically conductive cable;
  • the contact element which can be pushed onto the electrically conductive cable and which comprises an outer sleeve and an inner sleeve which can be pushed into the outer sleeve at least in sections.
  • a braided shield which consists of a large number of strands made of an electrically conductive material, is provided, which encloses the electrical inner conductor.
  • the braided shield is usually located within a cable jacket and is arranged between primary insulation, also called inner jacket, which is arranged between the inner conductor and braided shield, and secondary insulation, also called outer jacket or cable jacket, which surrounds the braided shield on the outside.
  • a shielding foil can be provided, which is usually a plastic-laminated aluminum foil. This shielding film does not transmit any noteworthy currents and is not also contacted if the braided shield is contacted, but is separated when the braided shield is exposed.
  • the braided shield can be connected to a ground in the end regions of the electrical cable.
  • at least one contact element is usually provided at each end of the cable, which are electrically conductively connected to the braided shield and can be connected to ground.
  • Known method for connecting a braided shield made of copper to a contact element are usually realized in that a support sleeve is pushed onto the secondary insulation of the cable and the exposed braided shield is folded back over the support sleeve. The contact part is then passed over the support sleeve and the braided shield resting on it and, for contacting, is radially pressed, for example crimped, with a suitable tool. During the pressing process, the braided shield is clamped between the support sleeve and the contact part.
  • conductive material for braided shields are aluminum or aluminum alloys, which due to its low mass is used in many areas of application, for example in the automotive sector, in particular in electrically powered automobiles.
  • aluminum wires made of aluminum or an aluminum alloy are pressed together, these wires naturally only have one very difficult to penetrate oxide layer on its surface.
  • a contacting process for a braided shield which is common in copper technology, is not able to establish contact with all the aluminum wires of the braided aluminum shield with the contact element due to the radial compression, since the oxide layers that form on the aluminum wires prevent transverse conductivity in the pressed areas.
  • the oxide layers for all wires in the braided shield cannot be broken through by known methods. It has also been shown that with known contacting methods in the case of aluminum braided shields, it is not possible to achieve a connection that is stable through thermal cycling.
  • connection methods for aluminum braided shields make use of additional measures in order to secure the contact of all aluminum wires and, if necessary, to be able to break up the oxide layer.
  • the braided shield is folded back over the sleeve and the connection is made using ultrasonic welding. In this process, a material connection between the braided shield and the contact part is established by supplying heat.
  • this type of connection technology has the disadvantage that the quality of the braided shield always also influences the quality of the connection; in this case, adhering substances from the previous processes are mainly disturbing factors.
  • the production of such electrically conductive connections between an aluminum braided shield and a contact element is dependent on the existence of expensive welding systems, which are also not portable and therefore cannot be used flexibly.
  • the EP 2 874 236 A1 describes a contact system consisting of a first inner contact part and a second outer Contact part by means of which an aluminum wire screen comprising several individual wires can be clamped and contacted.
  • the wire screen is pressed between a conical outer surface of a contact area of the first contact element and a conical inner surface of the second contact element via clamping means of the contact system.
  • the EP 3 139 446 A1 discloses a contact system for a coaxial cable, wherein a cable shield of the coaxial cable is clamped between a first conical surface, which is formed by a retaining element, and a second conical surface, which is formed by a sleeve.
  • This object relates to a contact system according to the invention for contacting an aluminum braided shield with a contact element of the type mentioned above, the inner sleeve having a first contact surface and the outer sleeve having a second contact surface for contacting the aluminum braided shield, the first and / or second contact surface each having areas with cross-sections of different sizes in relation to a conductor axis of the electrically conductive cable, and wherein the contact surfaces are designed such that the aluminum wires of the aluminum braided screen are in a contact position of the contact part by axially sliding the inner sleeve and the outer sleeve between the Contact surfaces are clamped and contacted with the contact part.
  • both individual conductors and of several conductors are understood in the context of the invention Single conductors consisting of 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, that is to say can run straight, curved or angled in sections. However, at least in the area of the contact, the conductor axis generally runs straight.
  • the term sleeve is usually understood to mean an element which comprises a, preferably central, through opening and a preferably rotationally symmetrical jacket body having the through opening.
  • the through opening can have any geometric cross section as long as at least one section of the electrically conductive cable is guaranteed to pass through.
  • the inner sleeve is that sleeve which, in the contact position, is arranged closer to the inner conductor in the radial direction.
  • the inner sleeve can be pushed onto the electrically conductive cable, so that the through opening of the inner sleeve, hereinafter referred to as the cable bushing, is advantageously adapted to the geometry of the electrical inner conductor of the cable, for example circular, elliptical or essentially polygonal.
  • the jacket body of the inner sleeve is designed in such a way that the inner sleeve can be pushed into the outer sleeve at least in sections, the first contact surface of the inner sleeve usually being formed by a radially outer peripheral surface of the inner sleeve.
  • the ability to be pushed in is achieved in that the outer dimensions of the inner sleeve are smaller than or equal to the inner dimensions of the through opening of the outer sleeve.
  • the second contact surface of the outer sleeve is usually formed by a radially inner circumferential surface, that is to say by the boundary surface of the through opening of the outer sleeve.
  • the contact surfaces are in any case defined by a surface of the inner sleeve or the outer sleeve and conceptually enclose a volume. If in light of the invention of A cross section of a contact surface is spoken of, this is understood to mean the cross section of the enclosed volume which is oriented normal to the conductor axis.
  • the aluminum braided shield is arranged between the contact surfaces so that the aluminum wires of the aluminum braided shield, preferably all aluminum wires if possible, contact both the first contact surface and the second contact surface. Due to the different sized cross-sections of at least one of the contact surfaces of the inner sleeve and outer sleeve, which are usually arranged correspondingly in the contact position, the aluminum wires of the aluminum braided shield contacting the contact surfaces are already clamped by axially sliding the outer sleeve and inner sleeve into one another.
  • each of the contact surfaces preferably has regions with a different cross-section.
  • either an electrical contact is established between the outer sleeve and / or the inner sleeve and the aluminum wires in order to enable potential equalization.
  • the geometry of the interacting contact surfaces of the sleeves a variety of shapes are possible, as long as the design of the contact surfaces and their cross-sections define at least one area through which a clamping force is exerted on the aluminum shield when the sleeves are pushed into one another.
  • axial pushing into one another or pressing together means that the two sleeves are pushed or pressed into one another in the direction of a conductor axis and the pressing is not achieved, as is known from the prior art, by subsequent radial pressing, e.g. crimping becomes. Uniform contact between the aluminum wires and the contact element is thus achieved by pushing the sleeves into one another, since the pressing is no longer carried out radially or punctually, but runs evenly over the contact surface and the aluminum wires.
  • the contact element according to the invention is also suitable for braided screen made of other materials or alloys, for example made of copper or copper alloys.
  • clamping and / or compression / shearing of the aluminum wires of the aluminum braided shield between the contact surfaces can be achieved in a particularly simple manner in that the first and second contact surfaces are conical.
  • the conicity of the two contact surfaces which usually relates to the conductor axis, ensures that the contact surfaces exert a clamping force on the aluminum wires or a pressure tip for pinching / shearing (i.e. cold welding) by axially displacing the sleeves into the contact position ) of the aluminum wires.
  • the contact surfaces are designed to correspond to one another, at least if both contact surfaces are designed to be conical.
  • an increase in the clamping force or a particularly efficient definition of an area in which a cold weld is produced is further achieved according to the invention in that the first and second contact surfaces are conical, the opening angles of the cones at least are of different sizes in sections. Due to the different opening angles in relation to the conductor axis, on the one hand there is an increase in the clamping force in the area in which the clear distance between the contact surfaces is minimal when they are pushed into one another axially. On the other hand, an area between the contact surfaces can be defined in which a pressure peak is formed when the sleeves are pressed together. Due to this pressure peak, the aluminum wires can be sheared / crushed to produce the cold weld.
  • one embodiment variant of the invention provides that the contact surfaces are further designed so that in the Contact position of the contact element by axially compressing the outer sleeve and inner sleeve, pinching / shearing of the aluminum wires of the aluminum braided shield and cold welding of the aluminum wires of the aluminum braided shield to the contact element takes place.
  • the contact between the aluminum braided shield and the contact element is achieved in the variant in that the contact surfaces of the inner sleeve and the outer sleeve are designed in such a way that the surface containing the oxide layer of as many aluminum wires as possible of the aluminum braided shield is broken when the inner sleeve and the outer sleeve are axially pressed together, so that a cold weld can occur between at least one contact surface and the aluminum braided shield.
  • the aluminum wires are squeezed or at least partially sheared / sheared off when they are pressed together, so that a cold weld occurs between the aluminum wires and at least one of the sleeves, i.e.
  • the inner sleeve and / or the outer sleeve are preferably mutually corresponding Areas with different cross-sections of the contact surfaces.
  • at least one area is defined in which a pressure peak is formed when the contact surfaces are pressed together.
  • This area usually corresponds to the area in which the clamping force is also exerted.
  • a cold-welded state can therefore be achieved if the sleeves are axially pressed together, for example starting from the contact position in which the aluminum braided shield is clamped between the contact surfaces.
  • Cold welding exploits the effect that aluminum tends to flow when very high pressure is applied and can therefore be cold-welded with contacting materials. Such a connection is permanent and electrically conductive.
  • the choice of the geometry of the interacting contact surfaces ensures that the oxide layer is reliably broken through when the sleeves are axially compressed by squeezing or squeezing the aluminum wires of the aluminum braided shield in an area defined by the contact surfaces . be sheared off.
  • the connection by means of the contact system according to the invention is insensitive to superficial contamination of the aluminum braided shield due to the local shearing / crushing and the cold welding that takes place there.
  • one of the sleeves is made of copper or a preferably coated copper alloy and serves as a contact sleeve while the other sleeve acts as a support sleeve.
  • the cold welding advantageously takes place both between the contact sleeve and between the support sleeve and the aluminum braided shield.
  • the second contact surface of the outer sleeve delimits 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 that can be inserted into the insertion volume.
  • the insertion volume of the outer sleeve is generally formed by a section of the through opening, preferably completely through the through opening. The interaction of the contact surfaces can be achieved in a simple manner through the design of the insertion volume of the outer sleeve and the insertable section of the inner sleeve.
  • the insertion volume and / or the insertable section taper at least in sections with respect to the conductor axis. Due to the tapering of at least one, preferably both, element (s) forming the contact surfaces, a geometry of the contact surfaces is achieved in a simple manner, which causes a clamping or pinching / shearing of the aluminum braided shield in the contact position. In the tapering section, that area is formed which exerts a clamping force on the aluminum wires or causes the aluminum wires to be crushed / sheared. It goes without saying that two, three, four or more tapering sections can also be provided.
  • the contact surfaces can be designed in such a way that in an intermediate position of the contact part, in which the inner sleeve is pushed into the outer sleeve in sections, a gap for receiving the aluminum braided shield is formed between the contact surfaces and the gap has at least one cross-sectional constriction.
  • a particularly space-saving design of the contact element is achieved in a preferred embodiment variant in that the inner sleeve in the contact position is completely received in the insertion volume of the outer sleeve.
  • the entire inner sleeve is designed as an insertable section.
  • a further variant embodiment of the invention provides that the first and / or the second contact surface in the contact position are at least partially designed to run obliquely to the conductor axis .
  • the imaginary extensions of the first and / or second contact surface intersect the conductor axis.
  • a kink is understood to mean the change in the slope in the conical or frustoconical contact surface or, in other words, the continuous transition between two mutually merging sections with different opening angles of the contact surface.
  • Each bend defines a circumferential contact edge on which a pressure peak forms and / or which exerts a clamping force on the aluminum braided shield.
  • Advantageous effects are already observed if only one of the contact surfaces has a kink.
  • 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 the clamping force is exerted on the aluminum wires in the contact position or in which the pressure tip is formed in the contact position.
  • the first and / or the second contact surface has at least one step.
  • a step is understood to mean a sudden increase or decrease in the cross-sectional area defining the corresponding contact surface normal to the conductor axis.
  • Such a configuration can be combined with any geometric shape of the contact surfaces, for example the first and / or second contact surface can have a cylindrical shape or the above-described conical shape according to the invention according to an example not claimed. It is advantageous if both contact surfaces have mutually corresponding first and second steps.
  • the at least one first and / or second stage defines the area in which the pressure peak for exerting the clamping force or for pinching / shearing and cold welding of the aluminum wires of the aluminum braided screen is formed in the contact position.
  • first contact surface have at least one first step and the second contact surface have at least one second step, the steps each forming a circumferential contact edge and the aluminum braided shield is contacted by the contact edges in the contact position.
  • the contact edges in turn define the area in which the pressure peak for exerting the clamping force or for pinching / shearing and cold welding of the aluminum wires of the aluminum braided screen is formed in the contact position.
  • one of the sleeves is designed as a contact sleeve, via which potential equalization is enabled, and the other sleeve is designed as a support sleeve.
  • the contact sleeve is made of copper or a copper alloy.
  • either the inner sleeve or the outer sleeve can be designed as a contact sleeve.
  • both the contact sleeve and the support sleeve are made of copper or a copper alloy. Therefore, in further embodiment variants of the invention it is provided that the inner sleeve and / or the outer sleeve is made of copper or a copper alloy.
  • one of the sleeves is made from copper or a copper alloy and the other sleeve is made from aluminum or an aluminum alloy.
  • the sleeve made of aluminum or an aluminum alloy that is to say the sleeve designed as a support sleeve, furthermore minimizes the tendency of the aluminum wires to corrode in the area of the contact element.
  • it can also be made of stainless steel, which is preferably protected against corrosion, for example by means of a corrosion-inhibiting coating.
  • a further particularly preferred embodiment of the invention provides that the sleeve made of copper or a copper alloy has a corrosion-inhibiting coating having.
  • Such corrosion-inhibiting coatings are particularly suitable as coating materials for nickel and / or tin or alloys containing nickel and / or tin.
  • the secondary insulation is removed at least in that area of the electrically conductive cable in which the contact element is arranged in the contact position, the area having the smallest cross section of the first contact surface being adjacent to the area having the secondary insulation of the cable is adjacent.
  • the inner sleeve is preferably inserted between the primary insulation and the aluminum braided shield so that the inner sleeve contacts the primary insulation on the one hand and the aluminum braided shield on the other. Therefore, it is provided in a further preferred embodiment of the invention that the inner sleeve is arranged in the contact position between the primary insulation and the aluminum braided shield, a cable bushing of the inner sleeve preferably making contact with the primary insulation. Both the inner sleeve and the outer sleeve or at least their contact surfaces are thus located in the radial direction in the stripped area of the cable.
  • the aluminum braided shield 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 shield. If the inner sleeve is in the contact position on the secondary insulation and thus the cable bushing, i.e. the passage opening, of the inner sleeve contacts the secondary insulation, the aluminum braided screen must be folded over to make contact over the first contact surface.
  • a particularly space-saving design is achieved in that the inner sleeve is pushed over the aluminum braided shield in the stripped area of the cable and then the aluminum braided shield is folded over the first contact surface.
  • the cable bushing makes contact with the section of the aluminum braided shield resting on the primary insulation and the first contact surface makes contact with the part of the aluminum braided shield that is folded back.
  • the electrically conductive cable is cut to length and the resulting open end of the cable is stripped, with at least the secondary insulation being removed in that or up to that area in which the contact is to be made with the contact element. It goes without saying that an already cut cable with a stripped open end can also be used.
  • the inner sleeve and outer sleeve are then pushed onto the cable, the cable being guided through the through opening of the sleeves, respectively the insertion volume and the cable bushing.
  • the electrical cable it is also conceivable for the electrical cable to be delivered already prefabricated, so that the outer sleeve and inner sleeve only need to be pushed or pressed together.
  • the contact element is to be arranged in the contact position in the non-stripped area of the cable, it is necessary to first slide the inner sleeve onto the secondary insulation, then fold the aluminum braided screen over the secondary insulation or over the inner sleeve and then the outer sleeve from the direction of the stripped area of the cable towards the inner sleeve.
  • the inner sleeve is between the secondary insulation and the folded back section of the Aluminum braid placed.
  • the outer sleeve is shifted from the direction of the open end of the cable in the direction of the area of the electrically conductive cable having the secondary insulation in order to be brought into the contact position.
  • the outer sleeve is first pushed onto the secondary insulation of the cable.
  • the inner sleeve is then inserted between the primary insulation and the aluminum braided shield so that it is no longer necessary to fold over the aluminum braided shield.
  • the outer sleeve is then pushed in the direction of the stripped area of the cable or in the direction of the inner sleeve.
  • the outer sleeve is pushed over the secondary insulation and then the inner sleeve is inserted between the aluminum braided shield and the primary insulation before the outer sleeve is moved in the direction of the inner sleeve.
  • the outer sleeve is displaced from the area of the electrical cable which has the secondary insulation in the direction of the open end of the cable in order to be brought into the contact position.
  • the inner sleeve in the stripped area is pushed directly onto the aluminum braided shield resting on the primary insulation and the aluminum braided shield is folded over the first contact surface in the stripped area of the electrically conductive cable.
  • the aluminum braided shield is exposed so far that a section is pushed over the Inner sleeve protrudes and can be turned over.
  • the outer sleeve is then subsequently shifted in the direction of the area of the electrically conductive cable having the secondary insulation.
  • the inner sleeve is first pushed over the aluminum braided shield and then a section of the aluminum braided shield protruding over the inner sleeve is folded over the first contact surface before the outer sleeve is shifted in the direction of the inner sleeve.
  • the outer sleeve is shifted from the direction of the open end of the cable in the direction of the area of the electrically conductive cable having the secondary insulation in order to be brought into the contact position.
  • the inner sleeve is placed between the inner conductor and the braided shield when viewed in the radial direction, if necessary with the primary insulation and / or the secondary insulation in between.
  • the Figures 1 and 2 show the basic structure of a contact system according to the invention for contacting an aluminum braided shield 7 with a contact element 1.
  • the aluminum braided shield 7 comprises a large number of aluminum wires and runs between a primary insulation 6 and a secondary insulation 8 of an electrically conductive cable 4.
  • the structure of the cable 4 which is especially in Figure 2 and 4th can be seen, looks like this:
  • the core of the cable 4 is formed by an electrical inner conductor 5 which defines a conductor axis 15 which runs in a straight line in the figures.
  • the inner conductor 5 is formed by a multiplicity of individual conductors bundled as a strand and has an essentially circular cross section.
  • the electrically conductive cable 4 Before contact can be made between the aluminum braided shield 7 and the contact element 1, the electrically conductive cable 4 must usually 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 has been removed. In the following, therefore, we will speak of the stripped area in this context. As a rule, the stripped area is arranged in the section of the open end of the cable 4 and extends, as in FIG Images can be seen, up to the end of the cable 4. Furthermore, as can be seen in the images, an end section of the cable 4 can be freed from primary insulation 6, aluminum braided screen 7 and secondary insulation 8, so that the inner conductor 5 is used for electrical purposes 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, the contact surfaces 2a, 3a being designed for contacting the aluminum braided shield 7 in the contact position shown.
  • the inner sleeve 2 can be pushed into the outer sleeve 3 at least in sections.
  • At least one of the two sleeves 2, 3 is designed as a contact sleeve and can be electrically connected to a ground for the purpose of potential equalization.
  • the contact surfaces 2a, 3a of the sleeves 2, 3 are designed in such a way that the aluminum wires of the aluminum braided shield 7 are clamped in the contact position of the contact part 1 by axially sliding the inner sleeve 2 and outer sleeve 3 between the contact surfaces 2a, 3a and with the contact part 1, the aluminum braided shield 7 is clamped in the illustrated contact position between the contact surfaces 2a, 3a.
  • the contact surfaces 2a, 3a in the exemplary embodiments are also designed in such a way that in the contact position of the contact element 1 by axially compressing the outer sleeve 3 and inner sleeve 2, the aluminum wires of the aluminum braided shield 7 are crushed / sheared and the aluminum wires of the aluminum braided shield 7 are cold-welded with the contact element 1 takes place.
  • This design is achieved in that the contact surfaces 2a, 3a have areas of different cross-sections, in the present case different diameters.
  • the electrical connection between the aluminum wires of the aluminum braided shield 7 and the contact element 1 is therefore in the contact position shown by means of cold welding manufactured. In other words, the aluminum wires are welded to the contact element 1 in the contact position.
  • the contact surfaces 2a, 3a surrounding the aluminum braided shield 7 achieve uniform contact with as many aluminum wires as possible, without the need for radial compression, such as crimping, or additional welding.
  • the electrical contact can be established by simply pushing or pressing the sleeves 2, 3 together.
  • Figure 3 shows an axonometric view of a first embodiment of the system according to the invention in an intermediate position in which the contact surfaces 2a, 3a of the sleeves 2, 3 are not yet in contact with the aluminum braided shield 7.
  • the first contact surface 2a of the inner sleeve 2 is conical, so that the size of the cross-sections or diameter changes normal to the conductor axis 15 along the entire longitudinal extent of the sleeves 2, 3.
  • the two contact surfaces 2a, 3a run obliquely to the conductor axis 15.
  • the contact surface 2a has two sections of different gradients which merge into one another at a bend 12.
  • the contact surface 2a has a larger opening angle in a first section facing the outer sleeve 3 in the present illustration, that is to say it is steeper than in the second section.
  • Figure 4 shows one to Figure 3 analog axonometric view of a second embodiment of the system according to the invention in the 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 sizes in cross section or diameter is composed, with two first stages 13 each separating two successive sections from one another.
  • FIG 5 is a contact element 1 of the first embodiment
  • a contact element 1 of the second exemplary embodiment that is to say the inner sleeve 2 and the outer sleeve 3
  • the through opening of the inner sleeve 2 is designed as a cable bushing 11 through which the cable 4 can be guided.
  • the first contact surface 2 a of the inner sleeve 2 is formed by an outer peripheral surface of the inner sleeve 2.
  • the through opening of the outer sleeve 3 is designed as an insertion volume 9 for receiving an insertable section 10 of the inner sleeve 2 and also serves to lead through the cable 4.
  • the insertable section 10 covers the entire extent of the inner sleeve 2, so that the inner sleeve 2 is in the contact position is completely received in the outer sleeve 3.
  • the insertable section 10 comprises only part of the longitudinal extent of the inner sleeve 2, so that a part of the inner sleeve 2 protrudes out of 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 delimits the insertion volume 9.
  • first contact surface 2a corresponds to that of the second contact surface 3a, insofar as the aluminum braided shield 7 can be clamped or cold-welded between the contact surfaces 2a, 3a.
  • the kink 12 defines the area in which a clamping force is exerted on the aluminum wires by the contact surfaces 2a, 3a or in which a pressure peak for pinching / shearing and cold welding of the aluminum wires is formed.
  • the area is thus a circumferential contact edge defined by the bend.
  • the steps 13, 14 define the area in which a clamping force is exerted on the aluminum wires by the contact surfaces 2a, 3a or in which a pressure peak for pinching / shearing and cold welding of the aluminum wires is formed.
  • each of the steps 13, 14 forms a circumferential contact edge which represents the above-mentioned area.
  • the Figures 7a, b, c, d and 8a, b, c, d 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 The first-mentioned figures show a system according to the first embodiment and the last-mentioned figures show a system according to the second embodiment.
  • a first step (see in Figures 7a, 7b or 8a, 8b) the outer sleeve 3 is pushed onto the electrically conductive cable 4.
  • the outer sleeve 3 is pushed out over the stripped area so that the outer sleeve 3 comes to rest over the secondary insulation 8.
  • the smallest diameter of its passage opening is greater than or equal to the diameter of the cable 4 including the secondary insulation 8.
  • the cable 4 is received in sections in the insertion volume 9 of the outer sleeve 3.
  • the second step (shown in the Figures 7b, 7c and 8b, 8c ) consists in that the inner sleeve 2 is pushed onto the electrically conductive cable 4.
  • the smallest diameter of the cable bushing 11 is greater than or equal to the diameter of the cable 4 including the primary insulation 6, so that the inner sleeve 2 can be pushed onto the primary insulation 6.
  • the inner sleeve 2 is pushed between the primary insulation 6 and the aluminum braided shield 7 so that the aluminum braided shield 7 makes contact with the first contact surface 2a. It is also conceivable that the aluminum braided shield 7 is lifted off the primary insulation 6 in a separate step and, after the inner sleeve 2 has been pushed on, is slipped onto the first contact surface 2a, for example by means of the step described below or in a separate step.
  • the outer sleeve 3 is then moved in the direction of the inner sleeve 2 until the second contact surface 3a and the first contact surface 2a contact the aluminum braided shield 7 in the contact position and the aluminum wires of the aluminum braided shield 7 between the Contact surfaces 2a, 3a are clamped and the electrical contact between contact element 1 and the aluminum braided shield 7 is established.
  • the wedge-shaped taper or bend 12 and in the second embodiment the steps 13, 14 define that area of the contact surfaces 2a, 3a in which the clamping force is exerted on the aluminum braided shield 7 in the contact position.
  • the surface of the aluminum wires with the oxide layer is broken open and the oxide layer is broken through and a new formation of the oxide layer is prevented so that an alternating temperature-resistant, highly conductive electrical connection between the aluminum braided screen 7 and the contact element 1 is ensured, if the aluminum wires are cold-welded after being pressed together in the contact position with the contact element 1.
  • one of the two sleeves 2, 3, i.e. either the inner sleeve 2 or the outer sleeve 3, is designed as a contact sleeve made of copper or a copper alloy and preferably a corrosion-inhibiting coating such as nickel and / or tin or alloys from it.
  • the potential equalization of the aluminum braided shield 7 with a ground is possible via this contact sleeve, in which the contact sleeve can be electrically connected to the ground by means of a compensating conductor.
  • the other sleeve is designed as a support sleeve and is made of aluminum or an aluminum alloy in order to reduce the corrosion of the aluminum wires.
  • any combination of the first and second exemplary embodiments are also suitable for achieving the same technical effects.
  • Geometries deviating from the geometry of the contact surfaces 2a, 3a shown in the exemplary embodiments are also conceivable if they enable the aluminum wires of the aluminum braided screen 7 to be clamped or compressed / sheared off.
  • FIG 9 a third embodiment of the contact system according to the invention is shown, in which the inner sleeve 2 is seated on the secondary insulation 8 in the contact position.
  • a section of the aluminum braided shield 7 is folded back over the first contact surface 2a.
  • 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 enable the clamping or compression / shearing of the aluminum wires of the aluminum braided screen 7 between the two contact surfaces 2a, 3a.
  • the method for contacting the aluminum braided shield 7 with the contact element 1 differs from the method previously described in connection with the first two design variants due to the different structure of the contact systems:
  • the inner sleeve 2 is placed on the open end of the electrically conductive cable 4 pushed on and pushed over the stripped area onto the secondary insulation 8.
  • the first contact surface 2a - as in the illustrated embodiment - has areas with a cross section of different sizes, it is advantageous if the area with the smallest cross section is directed in the direction of the open end of the cable 4.
  • the contact surfaces 2a, 3a are conical as in the first and fourth embodiment, but it is just as conceivable that the contact surfaces 2a, 3a analogously to the second Embodiment have steps or a combination of slopes and steps.
  • the inner sleeve 2 ends flush with the secondary insulation 8, with a left-hand or right-hand offset also being conceivable.
  • a section of the aluminum braided shield 7 exposed by the stripping is folded over the first contact surface 2a, so that the aluminum braided shield 7 is folded back and rests on the first contact surface 2a.
  • the outer sleeve 3 is then shifted from the direction of the open end of the cable 4 in the direction of the inner sleeve 2, so that the aluminum braided shield 7 is first clamped between the contact surfaces 2a, 3a and further compressed or sheared and cold-welded by axial compression.
  • conventional methods in which the aluminum braided shield 7 is folded over can be combined in a simple manner with the clamping or cold welding, which is advantageous for aluminum, by pushing the sleeves 2, 3 into one another or pressing them together.
  • Figure 10 shows a fourth embodiment of the contact system according to the invention, which is constructed similarly to the third embodiment described above.
  • the inner sleeve 2 does not sit on the secondary insulation 8 in the contact position, but on an exposed section of the aluminum braided shield 7.
  • the aluminum braided shield 7 is therefore exposed or stripped over a larger area than when it is turned over becomes.
  • the method for contacting the aluminum braided shield 7 is carried out analogously to the method described above, the inner sleeve 2 being pushed onto the exposed section of the aluminum braided shield 7 and the section of the aluminum braided shield 7 protruding over the inner sleeve 2 over the first contact surface 2a is handled.
  • the outer sleeve 3 is pushed on as described above.
  • Such Design enables a particularly space-saving arrangement of the contact element 1 in the contact position. Only when the sleeves 2, 3 are pushed into one another or pressed together to establish the contact, the inner sleeve 2 can rest on the aluminum braided shield 7, since the aluminum braided shield 7 underneath the inner sleeve 2 could be damaged during conventional radial pressing processes.
  • the secondary insulation 8 can be used as a stop for positioning the inner sleeve 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Cable Accessories (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Claims (15)

  1. Système de contact destiné à mettre en contact une tresse de blindage en aluminium (7) avec un élément de contact (1), comprenant
    - un câble électriquement conducteur (4) doté d'un conducteur électrique interne (5), d'un isolant primaire (6) entourant le conducteur électrique interne (5) et d'un isolant secondaire (8) entourant l'isolant primaire (6) ;
    - la tresse de blindage en aluminium (7) comprenant une pluralité de brins d'aluminium, laquelle est agencée au moins partiellement entre l'isolant primaire (6) et l'isolant secondaire (8) du câble électriquement conducteur (4) ;
    - l'élément de contact (1) pouvant glisser sur le câble électriquement conducteur (4), comprenant une douille extérieure (3) et une douille intérieure (2) pouvant être insérée au moins partiellement dans la douille extérieure (3),
    dans lequel la douille intérieure (2) comporte une première surface de contact (2a) et la douille extérieure (3) comporte une deuxième surface de contact (3a),
    dans lequel la première et/ou la deuxième surface de contact (2a, 3a) comporte des zones de sections de tailles différentes par rapport à un axe de conducteur (15) du câble électriquement conducteur (4),
    dans lequel les surfaces de contact (2a, 3a) sont réalisées pour pincer les brins d'aluminium de la tresse de blindage en aluminium (7) et entrer en contact avec ceux-ci,
    dans lequel le système de contact peut être amené dans une position de contact par coulissement axial l'une dans l'autre de la douille intérieure (2) et de la douille extérieure (3) avec interposition des brins d'aluminium de la tresse de blindage en aluminium (7), les brins d'aluminium de la tresse de blindage en aluminium (7) étant pincés entre les surfaces de contact (2a, 3a) et étant mis en contact avec l'élément de contact (1) dans cette position de contact,
    dans lequel la première (2a) et la deuxième surface de contact (3a) est réalisée comme conique,
    caractérisé en ce que les angles d'ouvertures des cônes sont au moins partiellement différents pour définir une zone dans laquelle il se forme un pic de pression pour pincer la tresse de blindage en aluminium (7) lors du coulissement axial l'une dans l'autre de la douille intérieure (2) et de la douille extérieure (3).
  2. Système de contact selon la revendication 1, caractérisé en ce que les surfaces de contact (2a, 3a) sont en outre réalisée pour permettre une soudure à froid des brins d'aluminium de la tresse de blindage en aluminium (7) avec l'élément de contact (1), dans lequel la douille extérieure (3) et la douille intérieure (2) sont comprimées axialement dans la position de contact de sorte que les brins d'aluminium de la tresse de blindage en aluminium (7) sont écrasés ou au moins partiellement cisaillés et soudés à froid avec au moins une des surfaces de contact (2a, 3a).
  3. Système de contact selon l'une des revendications 1 à 2, caractérisé en ce que la deuxième surface de contact (3a) de la douille extérieure (3) délimite un volume d'insertion (9) pour la douille intérieure (2) et la première surface de contact (2a) de la douille intérieure (2) est réalisée par une section insérable (10) de la douille intérieure (2) pouvant être insérée dans le volume d'insertion (9).
  4. Système de contact selon la revendication 3, caractérisé en ce que le volume d'insertion (9) et/ou la section insérable (10) se rétrécissent au moins partiellement par rapport à l'axe de conducteur (15).
  5. Système de contact selon l'une des revendications 3 à 4, caractérisé en ce que la douille intérieure (2) est, dans la position de contact, entièrement accueillie dans le volume d'insertion (9) de la douille extérieure (3).
  6. Système de contact selon l'une des revendications 1 à 5, caractérisé en ce que la première (2a) et/ou la deuxième surface de contact (3a) sont réalisées, dans la position de contact, au moins partiellement en biais par rapport à l'axe de conducteur (15).
  7. Système de contact selon l'une des revendications 1 à 6, caractérisé en ce que la première (2a) et/ou la deuxième surface de contact (3a) comporte au moins un coude (12).
  8. Système de contact selon l'une des revendications 1 à 7, caractérisé en ce que la première (2a) et/ou la deuxième surface de contact (3a) comporte au moins un niveau (13, 14).
  9. Système de contact selon l'une des revendications 1 à 8, caractérisé en ce que la première surface de contact (2a) comporte au moins un premier niveau (13) et la deuxième surface de contact (3a) comporte au moins un deuxième niveau (14), dans lequel les niveaux (13, 14) forment respectivement un bord de contact périphérique et la tresse de blindage en aluminium (7) entre en contact avec les bords de contact dans la position de contact.
  10. Système de contact selon l'une des revendications 1 à 9, caractérisé en ce que la douille intérieure (2) et/ou la douille extérieure (3) est fabriquée en cuivre ou en un alliage de cuivre.
  11. Système de contact selon l'une des revendications 1 à 10, caractérisé en ce que l'une des douilles (2, 3) est fabriquée en cuivre ou en un alliage de cuivre et l'autre douille respective (3, 2) est fabriquée en aluminium ou en un alliage d'aluminium ou en acier inoxydable.
  12. Système de contact selon l'une des revendications 10 à 11, caractérisé en ce que la douille (2, 3) fabriquée en cuivre ou en un alliage de cuivre comporte un revêtement inhibiteur de corrosion.
  13. Système de contact selon l'une des revendications 1 à 12, caractérisé en ce que le système de contact se trouve dans la position de contact, dans lequel l'isolant secondaire (8) est enlevé au moins dans la zone du câble électriquement conducteur (4) où l'élément de contact (1) est agencé, dans lequel la zone possédant la plus petite section de la première surface de contact (2a) jouxte la zone du câble (4) comportant l'isolant secondaire (8).
  14. Système de contact selon l'une des revendications 1 à 13, caractérisé en ce que le système de contact se trouve dans la position de contact, dans lequel la douille intérieure (2) est agencée entre l'isolant primaire (6) et la tresse de blindage en aluminium (7).
  15. Système de contact selon l'une des revendications 1 à 12, caractérisé en ce que la tresse de blindage en aluminium (7) est rabattue sur la première surface de contact (2a) de la douille intérieure (2) et un passe-câble (11) de la douille intérieure (2) entre en contact avec l'isolant secondaire (8) ou la tresse de blindage en aluminium (7).
EP18190109.1A 2017-05-12 2017-06-22 Système de contact destiné à la mise en contacte d'un tressage de blindage et d'un élément de contact Active EP3422480B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP17170864 2017-05-12
EP17731915.9A EP3417514B1 (fr) 2017-05-12 2017-06-22 Système de contact pour la mise en contact d'une tresse de blindage et d'un élément de contact
PCT/EP2017/065459 WO2018206127A1 (fr) 2017-05-12 2017-06-22 Système de contact pour la mise en contact d'une tresse de blindage et d'un élément de contact

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP17731915.9A Division EP3417514B1 (fr) 2017-05-12 2017-06-22 Système de contact pour la mise en contact d'une tresse de blindage et d'un élément de contact
EP17731915.9A Division-Into EP3417514B1 (fr) 2017-05-12 2017-06-22 Système de contact pour la mise en contact d'une tresse de blindage et d'un élément de contact

Publications (2)

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EP3422480A1 EP3422480A1 (fr) 2019-01-02
EP3422480B1 true EP3422480B1 (fr) 2020-09-30

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ID=58707405

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EP17731915.9A Active EP3417514B1 (fr) 2017-05-12 2017-06-22 Système de contact pour la mise en contact d'une tresse de blindage et d'un élément de contact
EP18190109.1A Active EP3422480B1 (fr) 2017-05-12 2017-06-22 Système de contact destiné à la mise en contacte d'un tressage de blindage et d'un élément de contact
EP18190110.9A Active EP3422481B1 (fr) 2017-05-12 2017-06-22 Système de contact destiné à la mise en contact d'un tressage de blindage et d'un élément de contact

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EP18190110.9A Active EP3422481B1 (fr) 2017-05-12 2017-06-22 Système de contact destiné à la mise en contact d'un tressage de blindage et d'un élément de contact

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Country Link
US (1) US11362445B2 (fr)
EP (3) EP3417514B1 (fr)
CN (1) CN110582894B (fr)
WO (1) WO2018206127A1 (fr)

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US20210091518A1 (en) * 2019-09-24 2021-03-25 Corning Optical Communications Rf Llc Coaxial cable connector having braid positioning elements and f-type female port with snap-in features
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CN112002469B (zh) * 2020-08-18 2022-02-11 昆山联滔电子有限公司 一种电缆及电缆的加工方法
CN113437541B (zh) * 2020-08-26 2023-03-14 河南四达电力设备股份有限公司 一种滑块式楔形防雷引下线接续装置
CN112072336B (zh) * 2020-08-26 2022-09-30 国网山东省电力公司电力科学研究院 一种用于导线连接的非压接接续金具及接续方法
EP4156417A1 (fr) * 2021-09-22 2023-03-29 Schleich GmbH Dispositif de mise en contact électrique d'un moteur électrique

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Also Published As

Publication number Publication date
EP3422481A1 (fr) 2019-01-02
EP3422480A1 (fr) 2019-01-02
CN110582894A (zh) 2019-12-17
EP3422481B1 (fr) 2020-12-23
EP3417514A1 (fr) 2018-12-26
WO2018206127A1 (fr) 2018-11-15
US11362445B2 (en) 2022-06-14
EP3417514B1 (fr) 2019-12-18
CN110582894B (zh) 2021-11-23
US20210143562A1 (en) 2021-05-13

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