EP3417514B1 - Système de contact pour la mise en contact d'une tresse de blindage et d'un élément de contact - Google Patents

Système de contact pour la mise en contact d'une tresse de blindage et d'un élément de contact Download PDF

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Publication number
EP3417514B1
EP3417514B1 EP17731915.9A EP17731915A EP3417514B1 EP 3417514 B1 EP3417514 B1 EP 3417514B1 EP 17731915 A EP17731915 A EP 17731915A EP 3417514 B1 EP3417514 B1 EP 3417514B1
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EP
European Patent Office
Prior art keywords
contact
inner sleeve
aluminum
sleeve
aluminium
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
EP17731915.9A
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German (de)
English (en)
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EP3417514A1 (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
Original Assignee
Gebauer and Griller Kabelwerke GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gebauer and Griller Kabelwerke GmbH filed Critical Gebauer and Griller Kabelwerke GmbH
Priority to EP18190110.9A priority Critical patent/EP3422481B1/fr
Priority to EP18190109.1A priority patent/EP3422480B1/fr
Publication of EP3417514A1 publication Critical patent/EP3417514A1/fr
Application granted granted Critical
Publication of EP3417514B1 publication Critical patent/EP3417514B1/fr
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Anticipated expiration legal-status Critical

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    • 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
    • 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
    • H01R4/5016—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 screen braid
  • a contact system for contacting an aluminum screen braid comprising 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 screen braid comprising a plurality of aluminum wires, which is arranged 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 inserted at least in sections into the outer sleeve.
  • a screen braid which consists of a plurality of strands made of an electrically conductive material and which envelops the electrical inner conductor.
  • the shield braid is usually located within a cable sheath and is arranged between a primary insulation, also called inner sheath, which is arranged between the inner conductor and the shield braid, and a secondary insulation, also called outer sheath or cable sheath, which surrounds the shield braid on the outside.
  • a shielding film which is usually a plastic-laminated aluminum foil, may be provided either between the primary insulation and the shielding braid or between the shielding braid and the secondary insulation.
  • This screen film does not transmit any appreciable currents and is not contacted when the screen braid is contacted, but is separated when the screen braid is exposed.
  • the braided screen can be connected to a ground in the end regions of the electrical cable.
  • at least one contact element is generally provided at each end of the cable, which are connected in an electrically conductive manner to the braided shield and can be connected to the ground.
  • Known methods for connecting a braid 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 pushed back over the support sleeve. The contact part is then guided over the support sleeve and the braided shield resting thereon and radially pressed, for example crimped, with a suitable tool for contacting. Through the pressing process, the braided screen is clamped between the support sleeve and the contact part. These methods can only be used for materials with good transverse conductivity, since the braiding of the shielding is only carried out selectively.
  • Aluminum or aluminum alloys are also suitable as conductive material for screen braids, which due to its low mass is used in many fields 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 screen braid that is common in copper technology is not able to make contact with all aluminum wires of the aluminum screen braid with the contact element due to the radial pressing, since the oxide layers that form on the aluminum wires prevent the transverse conductivity in the pressed areas.
  • the known layers cannot break through the oxide layers for all wires in the braided shield. It has also been shown that no known connection can be achieved with known contacting methods in the case of aluminum screen braids.
  • connection methods for aluminum shielding braids use additional measures to secure the contacting of all aluminum wires and, if necessary, to be able to break open the oxide layer.
  • connection methods for aluminum shielding braids use additional measures to secure the contacting of all aluminum wires and, if necessary, to be able to break open the oxide layer.
  • this type of connection technology has the disadvantage that the quality of the shielding braid always influences the quality of the connection; here, above all, adhering substances from the previous processes are interference factors.
  • the production of such electrically conductive connections between an aluminum screen braid and a contact element is dependent on the presence 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 a plurality of 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 US 5 508 475 A discloses the preamble of claim 1.
  • This object relates to a contact system according to the invention for contacting an aluminum screen braid with a contact element of the type mentioned at the outset, the inner sleeve having a first contact surface and the outer sleeve having a second contact surface for contacting the aluminum screen braid, the first and / or second contact surface in each case regions with a different cross-section relative 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 braid are clamped in a contact position of the contact part by axially pushing the inner sleeve and the outer sleeve between the contact surfaces and are in contact with the contact part.
  • an electrical inner conductor made of electrically conductive material preferably copper, aluminum or at least one of these Alloys containing metals are understood in the sense of the invention to mean both single conductors and strands consisting of several individual conductors 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 be straight, curved or angled in sections. At least in the area of the contacting, however, the conductor axis generally runs in a straight line.
  • a sleeve is usually understood to mean an element which comprises a, preferably central, through-opening and a, preferably rotationally symmetrical, casing body having the through-opening.
  • the through opening can in principle have any geometric cross section, as long as the passage of at least a section of the electrically conductive cable is ensured.
  • the inner sleeve is the sleeve that is arranged closer to the inner conductor in the contact position 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 such that the inner sleeve can be inserted at least in sections into the outer sleeve, the first contact surface of the inner sleeve generally being formed by a radially outer peripheral surface of the inner sleeve.
  • the insertability 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 generally 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 defined by a surface of the inner sleeve or the outer sleeve and theoretically enclose a volume. If, in the light of the invention, one speaks of a cross section of a contact surface, this is understood to mean the cross section of the enclosed volume, which is oriented normal to the conductor axis.
  • the aluminum screen braid is arranged between the contact surfaces, so that the aluminum wires of the aluminum screen braid, preferably If possible, contact all aluminum wires, both the first contact surface and the second contact surface. Due to the cross-sections of at least one of the contact surfaces of the inner sleeve and outer sleeve, which are provided according to the invention and are generally arranged in a corresponding manner in the contact position, the aluminum wires of the aluminum shielding braid contacting the contact surfaces are already clamped by axially pushing the outer sleeve and inner sleeve together.
  • each of the contact surfaces preferably has regions with different cross sections.
  • Either an electrical contact is thus made between the outer sleeve and / or the inner sleeve and the aluminum wires in order to enable equipotential bonding.
  • a large number of shapes can be used to select the geometry of the interacting contact surfaces of the sleeves, as long as at least one area is defined by the configuration of the contact surfaces and their cross-sections, through which a clamping force acting on the aluminum shield is exerted when the sleeves are pushed into one another.
  • axial pushing together or pressing together is understood to mean 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, for example crimping becomes.
  • a uniform contact between the aluminum wires and the contact element is already by pushing the sleeves together achieved because the pressing is no longer carried out radially or selectively, but runs evenly over the contact surface and the aluminum wires.
  • the contact element according to the invention is also suitable for screen braids made of other materials or alloys, for example of copper or copper alloys.
  • the invention provides that the first and the second contact surface have 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 in principle be combined with any geometrical shape of the contact surfaces, for example the first and / or second contact surface can have a cylindrical shape or the previously described conical shape.
  • the two contact surfaces have mutually corresponding first and second stages.
  • the at least one first and second step defines the area in which the pressure peak in the contact position for exerting the clamping force or for squeezing / shearing and cold welding the aluminum wires of the aluminum screen braid is formed.
  • the invention further provides that the first contact surface has at least one first step and the second contact surface has at least one second step, wherein the steps each form a circumferential contact edge and the aluminum screen braid is contacted by the contact edges in the contact position.
  • the contact edges in turn define the area in which the pressure peak is formed in the contact position to exert the clamping force or to pinch / shear and cold weld the aluminum wires of the aluminum screen braid.
  • the contact surfaces are further designed such that in the Contact position of the contact element by axial compression of the outer sleeve and inner sleeve, a crushing / 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 the aluminum shielding braid and the contact element is thus achieved in the embodiment variant in that the contact surfaces of the inner sleeve and outer sleeve are designed in such a way that the surface having the oxide layer, if possible, of all the aluminum wires of the aluminum shielding braid is broken open when the inner sleeve and outer sleeve are pressed together axially. so that cold welding can occur between at least one contact surface and the aluminum screen braid.
  • the aluminum wires are squeezed or at least partially sheared / sheared off during the pressing together, so that cold welding occurs between the aluminum wires and at least one of the sleeves, that is to say the inner sleeve and / or the outer sleeve.
  • At least one area is defined in which forms a pressure peak when pressed together.
  • This area usually corresponds to the area in which the clamping force is also exerted.
  • Cold welding takes advantage of the fact that aluminum tends to flow under very high pressure and can therefore be cold welded to 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 pressed together axially, by squeezing or squeezing the aluminum wires of the aluminum shielding braid in a region defined by the contact surfaces be sheared.
  • the connection by means of the contact system according to the invention is insensitive to surface contamination of the aluminum screen braid due to the local shear / crushing and the cold welding taking place there.
  • a large number of shapes are possible for the choice of the geometry of the interacting contact surfaces of the sleeves, as long as the design of the contact surfaces and their areas with different cross sections defines at least one area in which a pressure peak is formed during the axial pressing together, which leads to crushing / Shear of the aluminum wires and ultimately leads to cold welding.
  • one of the sleeves is made of copper or a, preferably coated, copper alloy and serves as a contact sleeve while the other sleeve functions as a support sleeve.
  • Cold welding advantageously takes place both between the contact sleeve and between the support sleeve and the aluminum screen braid instead.
  • 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 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 through a section of the through opening, preferably completely through the through opening.
  • the insertion volume and / or insertable section taper at least in sections with respect to the conductor axis.
  • the element (s) forming the contact surfaces By tapering at least one, preferably both, the element (s) forming the contact surfaces, a geometry of the contact surfaces is achieved in a simple manner, which causes the aluminum screen braid to be clamped or crushed / sheared in the contact position.
  • the area In the tapering section, the area is formed which exerts a clamping force on the aluminum wires or causes a crushing / shearing of the aluminum wires. 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 partially inserted into the outer sleeve, a gap for receiving the aluminum screen braid is formed between the contact surfaces and the gap has at least one cross-sectional constriction.
  • first and / or the second contact surface in the contact position are at least partially inclined to the conductor axis , In other words, the imaginary extensions of the first and / or second contact surface intersect the conductor axis.
  • clamping and / or compression / shearing of the aluminum wires of the aluminum screen braid between the contact surfaces can be achieved in that the first and / or the second contact surface is conical. Due to the taper, which generally relates to the conductor axis of the at least one contact surface, preferably both contact surfaces, it is achieved that the contact surfaces exert a clamping force on the aluminum wires by means of an axial displacement of the sleeves into the contact position, or a pressure peak for crushing / Form shear (i.e. cold welding) the aluminum wires. It goes without saying that the contact surfaces are designed to correspond to one another, at least if both contact surfaces are conical.
  • an increase in the clamping force or a particularly efficient definition of a region in which cold welding is produced is achieved in a further preferred embodiment variant in that the first and the second contact surface are conical, the opening angles of the cones being different in size, at least in sections. Because of the different Opening angle in relation to the conductor axis, when axially pushed into one another, results in an increase in the clamping force in the area in which the clear distance between the contact surfaces is minimal. On the other hand, an area can be defined between the contact surfaces 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 in order to produce the cold welding.
  • the effects previously mentioned 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.
  • the term kink here means the change in the slope in the conical or frustoconical contact surface, or in other words, 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 exerts a clamping force on the aluminum screen braid.
  • 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 the pressure peak is formed in the contact position.
  • one of the sleeves is designed as a contact sleeve, via which the equipotential bonding is made possible and the other sleeve is designed as a support sleeve.
  • the contact sleeve made of copper or a Copper alloy is made.
  • 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. It is therefore provided in further embodiment variants of the invention that the inner sleeve and / or the outer sleeve is made of copper or a copper alloy.
  • one of the sleeves is made of copper or a copper alloy and the other sleeve is made of aluminum or an aluminum alloy.
  • the sleeve made of aluminum or an aluminum alloy ie the sleeve designed as a support sleeve, further minimizes the tendency of the aluminum wires to corrode in the region 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.
  • the sleeve made of copper or a copper alloy has a corrosion-inhibiting coating having.
  • Nickel and / or tin or alloys containing nickel and / or tin are particularly suitable as coating materials for such a corrosion-inhibiting coating.
  • 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 adjacent to the cable.
  • the inner sleeve is preferably inserted between the primary insulation and the aluminum shield braid, so that the inner sleeve contacts the primary insulation on the one hand and the aluminum shield braid on the other hand. It is therefore provided in a further preferred embodiment variant of the invention that the inner sleeve is arranged in the contact position between the primary insulation and the aluminum shielding braid, 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 located in the radial direction in the stripped area of the cable.
  • the aluminum shielding braid 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 shielding braid. If the inner sleeve sits on the secondary insulation in the contact position and thus the cable entry, i.e. the through hole, of the inner sleeve contacts the secondary insulation, the aluminum shielding braid has to be turned over for contacting via the first contact surface.
  • a particularly space-saving design is achieved by pushing the inner sleeve in the stripped area of the cable over the aluminum shielding braid and then turning the aluminum shielding braid over the first contact surface.
  • the cable bushing contacts the section of the aluminum shielding braid that is in contact with the primary insulation and the first contact surface contacts the part of the aluminum shielding braid that has been turned back.
  • the electrically conductive cable is first cut to length and an open end of the cable resulting therefrom is stripped, with at least the secondary insulation being removed in that or up to that area in which the contacting with the contact element is to be made during the stripping. It goes without saying that an already cut cable with stripped open end can also be used.
  • the inner sleeve and outer sleeve are pushed onto the cable, the cable being guided through the through opening of the sleeves, or respectively the insertion volume and the cable bushing.
  • the electrical cable is already supplied prefabricated, so that the outer sleeve and inner sleeve only have 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 push the inner sleeve onto the secondary insulation, then to fold the aluminum shielding braid over the secondary insulation or over the inner sleeve and then the outer sleeve from the direction of the stripped area of the cable in the direction of the inner sleeve.
  • the inner sleeve is placed between the secondary insulation and the folded-back section of the aluminum screen braid.
  • the inner sleeve is first pushed over the secondary insulation and then the aluminum screen braid is folded over the first contact surface before the outer sleeve is moved in the direction of the inner sleeve.
  • the outer sleeve is displaced from the direction of the open end of the cable in the direction of the region of the electrically conductive cable which has 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 shielding braid, so that it is no longer necessary to turn the aluminum shielding braid.
  • 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 first pushed over the secondary insulation and then the inner sleeve is inserted between the aluminum braided shield and primary insulation before the outer sleeve is moved in the direction of the inner sleeve.
  • the outer sleeve is displaced from the region 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 shielding braid attached to the primary insulation and the aluminum shielding braid is folded over the first contact surface in the stripped area of the electrically conductive cable.
  • the aluminum screen braid is exposed to such an extent that a section protrudes over the pushed-on inner sleeve and can be folded over.
  • the outer sleeve is then displaced in the direction of the region of the electrically conductive cable which has the secondary insulation.
  • the inner sleeve is first pushed over the aluminum shielding braid and then a section of the aluminum shielding braid projecting over the inner sleeve is folded over the first contact surface before the outer sleeve is displaced in the direction of the inner sleeve.
  • the outer sleeve is made Moved towards the open end of the cable in the direction of the region 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 screen braid, viewed in the radial direction, possibly with the intermediate insulation and / or the secondary insulation being interposed.
  • the Figures 1 and 2 show the basic structure of a contact system according to the invention for contacting an aluminum screen braid 7 with a contact element 1.
  • the aluminum screen braid 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 in particular in Figure 2 and 4 can be seen as follows:
  • 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 plurality of individual conductors bundled as a strand and has an essentially circular cross section.
  • the electrically conductive cable 4 has to 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.
  • the stripped area is arranged in the section of the open end of the cable 4 and, as can be seen in the figures, extends to the end of the cable 4.
  • an end section can also be provided the cable 4 of primary insulation 6, aluminum shield braid 7 and 8 secondary insulation 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, the contact surfaces 2a, 3a being designed for contacting the aluminum screen braid 7 in the contact position shown.
  • the inner sleeve 2 can be inserted 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 equipotential bonding.
  • the contact surfaces 2a, 3a of the sleeves 2, 3 are designed such that the aluminum wires of the aluminum screen braid 7 are clamped in the contact position of the contact part 1 by axially pushing the inner sleeve 2 and outer sleeve 3 between the contact surfaces 2a, 3a and with the contact part 1 are contacted, the aluminum screen braid 7 is clamped in the contact position shown 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 pressing the outer sleeve 3 and the inner sleeve 2, the aluminum wires of the aluminum screen braid 7 are crushed / sheared and the aluminum wires of the aluminum screen braid 7 are cold-welded takes place with the contact element 1.
  • This design is achieved in that the contact surfaces 2a, 3a have areas of different cross-sections, in the present case different diameters. Therefore, the electrical connection between the aluminum wires of the aluminum screen braid 7 and the contact element 1 is made in the contact position shown by means of cold welding. 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 screen braid 7 ensure that all aluminum wires are evenly contacted, if possible, without radial pressing, for example crimping, or that additional welding is necessary. Nevertheless, the electrical contact can be made by simply pushing or pressing the sleeves 2, 3 together.
  • Figure 3 shows an axonometric view of a first exemplary 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 screen braid 7.
  • the first contact surface 2a of the inner sleeve 2 is conical, so that the size of the cross sections or diameters change normal to the conductor axis 15 along the entire longitudinal extent of the sleeves 2, 3.
  • both 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 2 a has a larger opening angle in a first section facing the outer sleeve 3 in the present illustration, that is to say is steeper than in the second section.
  • Figure 4 shows one too 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 is composed of three cylindrical sections of different cross-section or diameter, two first steps 13 each separating two successive sections.
  • FIG 5 is a contact element 1 of the first embodiment
  • Figure 6 a contact element 1 of the second embodiment, that is, the inner sleeve 2 and the outer sleeve 3, respectively, shown in detail.
  • the inner sleeve 2 and outer sleeve 3 each have a through opening and that the inner sleeve 2 can be inserted into the outer sleeve 3 at least in sections.
  • 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 2a 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 for the passage of the cable 4.
  • the insertable section 10 comprises the entire extent of the inner sleeve 2, so that the inner sleeve 2 is in the contact position is completely accommodated 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 from the outer sleeve 3 in the contact position.
  • the second contact surface 3a is formed by an inner peripheral 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 screen braid 7 can be clamped or cold-welded between the contact surfaces 2a, 3a.
  • the kink 12 defines that area in which a clamping force is exerted on the aluminum wires by the contact surfaces 2a, 3a or in which a pressure peak is formed for crushing / shearing and cold welding the aluminum wires.
  • the area is therefore a circumferential contact edge defined by the kink.
  • 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 is formed for crushing / shearing and cold welding the aluminum wires.
  • a circumferential contact edge is formed by each of the steps 13, 14, which represents the above-mentioned area.
  • FIGS 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, a system according to the first embodiment being shown in the former figures and a system according to the second embodiment being shown in the latter figures.
  • a first step can be seen 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 beyond the stripped area, so that the outer sleeve 3 comes to rest on the secondary insulation 8.
  • the smallest diameter of its through 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 ) is 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 inserted between the primary insulation 6 and the aluminum shielding braid 7, so that the aluminum shielding braid 7 contacts the first contact surface 2a. It is also conceivable that the aluminum screen braid 7 is lifted off the primary insulation 6 in a separate step and, after the inner sleeve 2 has been pushed on, is put 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 in the contact position the second contact surface 3a and the first contact surface 2a contact the aluminum screen braid 7 and the aluminum wires of the aluminum screen braid 7 are clamped between the contact surfaces 2a, 3a and the electrical contact between contact element 1 and the aluminum screen braid 7 is established.
  • this defines the wedge-shaped taper or Bend 12 and, in the second exemplary embodiment, steps 13, 14 that area of the contact surfaces 2a, 3a in which the clamping force is exerted on the aluminum screen braid 7 in the contact position.
  • the surface of the aluminum wires having the oxide layer is broken up and the oxide layer is thus broken through and a new formation of the oxide layer is prevented, so that an alternating temperature-resistant, well-conducting electrical connection between the aluminum screen braid 7 and the contact element 1 is ensured, if the aluminum wires are cold-welded in the contact position with the contact element 1 after being pressed together.
  • one of the two sleeves 2, 3, that is to say either the inner sleeve 2 or the outer sleeve 3, is designed as a contact sleeve which is made of copper or a copper alloy and preferably a corrosion-inhibiting coating, for example made of nickel and / or tin or alloys therefrom.
  • the potential equalization of the aluminum screen braid 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 an equalizing 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 combinations 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 conceivable if they enable the aluminum wires of the aluminum screen braid 7 to be clamped or compressed / sheared off.
  • FIG. 9 A third exemplary 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 screen braid 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, that is to say in the direction of the conductor axis 15, in order to enable the aluminum wires of the aluminum shielding braid 7 to be clamped or compressed / sheared between the two contact surfaces 2a, 3a.
  • the method for contacting the aluminum screen braid 7 with the contact element 1 differs from the methods previously described in connection with the first two embodiment 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 2 a - as in the exemplary embodiment shown - has areas with different cross sections, 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 exemplary embodiments, but it is equally conceivable that the contact surfaces 2a, 3a have steps analogous to the second exemplary embodiment, or a combination of inclines and steps.
  • the inner sleeve 2 is flush with the secondary insulation 8, and there is also a left-hand or right-hand offset is conceivable. Subsequently, a section of the aluminum screen braid 7 exposed by the stripping is folded over the first contact surface 2a, so that the aluminum screen braid 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 screen braid 7 is first clamped between the contact surfaces 2a, 3a and is further compressed or sheared off by axial pressing and cold welded.
  • Such a configuration allows conventional methods in which the aluminum screen braid 7 is folded over to be combined in a simple manner with the clamping or cold welding which is advantageous for aluminum by pushing the sleeves 2, 3 together or pressing them together.
  • Figure 10 shows a fourth embodiment of the contact system according to the invention, which is constructed similarly to the previously described third embodiment.
  • the inner sleeve 2 In the contact position, in contrast to the previously described exemplary embodiment, the inner sleeve 2 is not seated on the secondary insulation 8, but rather on an exposed section of the aluminum shielding braid 7.
  • the aluminum shielding braid 7 is thus exposed or stripped over a larger area than when it is turned over becomes.
  • the method for contacting the aluminum shielding braid 7 is carried out analogously to the method described above, with the inner sleeve 2 just being pushed onto the exposed section of the aluminum shielding braid 7 and the section of the aluminum shielding braid 7 projecting over the inner sleeve 2 over the first contact surface 2a is handled.
  • the outer sleeve 3 is pushed on as previously described.
  • Such a design enables a particularly space-saving arrangement of the contact element 1 in the contact position. Only by pushing or pressing the sleeves 2, 3 according to the invention in order to produce the contact does it become a contact of the inner sleeve 2 on the aluminum shielding braid 7, since the aluminum shielding braid 7 located under the inner sleeve 2 could be damaged in 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 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,
    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 et la tresse de blindage en aluminium (7) entre en contact avec les bords de contact dans la position de contact.
  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 le manchon intérieur (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 du 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, comme partiellement en biais par rapport à l'axe 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) est réalisée comme conique.
  8. Système de contact selon l'une des revendications 1 à 7, caractérisé en ce que la première (2a) et la deuxième surface de contact (3a) sont réalisées comme coniques, dans lequel les angles d'ouvertures sont au moins partiellement différents.
  9. Système de contact selon l'une des revendications 7 à 8, caractérisé en ce que la première (2a) et/ou la deuxième surface de contact (3a) comporte au moins un coude (12).
  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 qu'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).
EP17731915.9A 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 Active EP3417514B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18190110.9A 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
EP18190109.1A 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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17170864 2017-05-12
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 Child Applications (4)

Application Number Title Priority Date Filing Date
EP18190110.9A Division-Into 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
EP18190110.9A Division 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
EP18190109.1A Division-Into 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
EP18190109.1A Division 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

Publications (2)

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EP3417514A1 EP3417514A1 (fr) 2018-12-26
EP3417514B1 true EP3417514B1 (fr) 2019-12-18

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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
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
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

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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
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

Country Status (4)

Country Link
US (1) US11362445B2 (fr)
EP (3) EP3422481B1 (fr)
CN (1) CN110582894B (fr)
WO (1) WO2018206127A1 (fr)

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Also Published As

Publication number Publication date
US20210143562A1 (en) 2021-05-13
WO2018206127A1 (fr) 2018-11-15
EP3422480A1 (fr) 2019-01-02
CN110582894B (zh) 2021-11-23
US11362445B2 (en) 2022-06-14
CN110582894A (zh) 2019-12-17
EP3417514A1 (fr) 2018-12-26
EP3422481B1 (fr) 2020-12-23
EP3422481A1 (fr) 2019-01-02
EP3422480B1 (fr) 2020-09-30

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