EP1858116B1 - Shielded electrical harness, in particular for an airplane engine - Google Patents

Shielded electrical harness, in particular for an airplane engine Download PDF

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Publication number
EP1858116B1
EP1858116B1 EP07290601A EP07290601A EP1858116B1 EP 1858116 B1 EP1858116 B1 EP 1858116B1 EP 07290601 A EP07290601 A EP 07290601A EP 07290601 A EP07290601 A EP 07290601A EP 1858116 B1 EP1858116 B1 EP 1858116B1
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EP
European Patent Office
Prior art keywords
braid
harness according
tubular
harness
metal
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.)
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Application number
EP07290601A
Other languages
German (de)
French (fr)
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EP1858116A1 (en
Inventor
Geoffray Deterre
Pascal Henrioux
Anthony Lorand
Pascal Pelisson
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.)
Safran Aircraft Engines SAS
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SNECMA SAS
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Publication date
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Publication of EP1858116A1 publication Critical patent/EP1858116A1/en
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Publication of EP1858116B1 publication Critical patent/EP1858116B1/en
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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
    • 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
    • H01R4/70—Insulation of connections
    • H01R4/72—Insulation of connections using a heat shrinking insulating sleeve
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6581—Shield structure
    • H01R13/6582—Shield structure with resilient means for engaging mating connector
    • H01R13/6583—Shield structure with resilient means for engaging mating connector with separate conductive resilient members between mating shield members
    • H01R13/6584—Shield structure with resilient means for engaging mating connector with separate conductive resilient members between mating shield members formed by conductive elastomeric members, e.g. flat gaskets or O-rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6598—Shield material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/533—Bases, cases made for use in extreme conditions, e.g. high temperature, radiation, vibration, corrosive environment, pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
    • H01R13/6461—Means for preventing cross-talk
    • H01R13/6471—Means for preventing cross-talk by special arrangement of ground and signal conductors, e.g. GSGS [Ground-Signal-Ground-Signal]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
    • H01R13/6592—Specific features or arrangements of connection of shield to conductive members the conductive member being a shielded cable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2107/00—Four or more poles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
    • H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
    • H01R24/56—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency specially adapted to a specific shape of cables, e.g. corrugated cables, twisted pair cables, cables with two screens or hollow cables
    • H01R24/564—Corrugated cables

Definitions

  • the invention relates to a shielded or double-shielded electrical harness with a double sealing barrier for areas with a severe environment in terms of temperature, vibrations and electromagnetic disturbances, such as for example a turbojet or a turboprop.
  • a harness of this type comprises a set of electric wires and cables which for example provide the connection between different electrical equipment such as a motor electronic control system or sensors.
  • a structure comprising a textile braid forming a first protective layer of electrical cables and wires is generally used to protect the electrical cables and wires, a metallic tubular braid of electromagnetic shielding surrounding the textile braid, and an outer sheath of heat-shrinkable polymer whose end comprises a thermo-retractable polymer tip for protecting the end of the shielding braid on a tubular piece of metal or composite connection and to connect the outer sheath to this connection piece.
  • This structure has the advantage of accepting relatively small radii of curvature, but its thermal resistance is limited to 150 ° C.
  • a tubular protection structure of electrical cables and wires which includes an inner sheath of PTFE (polytetrafluoroethylene), a braided electromagnetic shielding braid surrounding this sheath, and a textile braid which surrounds the braid of shielding and which is made of a material supporting high temperatures, for example aramid fibers, the end of this structure being fixed by a mechanical collar on a metal or composite connection piece.
  • PTFE polytetrafluoroethylene
  • a braided electromagnetic shielding braid surrounding this sheath
  • textile braid which surrounds the braid of shielding and which is made of a material supporting high temperatures, for example aramid fibers
  • EP-A1-0693811 discloses an electrical harness comprising electrical conductors placed in a tubular protective structure which comprises a rubber or textile sheath surrounding the conductors, a copper braid surrounding the sheath, an insulating sheath surrounding the copper braid, and a metallic sheath ring around the insulating sheath.
  • a tubular protective structure which comprises a rubber or textile sheath surrounding the conductors, a copper braid surrounding the sheath, an insulating sheath surrounding the copper braid, and a metallic sheath ring around the insulating sheath.
  • the present invention relates to a single structure for protecting and connecting cables and electrical wires of the aforementioned type, which does not have the drawbacks of known structures, which can be used both in zones with a maximum temperature of about 150 ° C. only in areas where the temperature reaches 260 ° C peak, and which accepts relatively small radii of curvature.
  • the invention proposes, for this purpose, a shielded and sealed electrical harness, in particular for an aircraft engine, according to claim 1.
  • the outer sheath is made of a high temperature material, for example PTFE, and its annular structure allows it to accept small radii of curvature.
  • the tip of heat-shrinkable material which is attached to the end of this outer sheath, ensures the attachment of the sheath on a connector or branch connection.
  • the end of the metal shielding braid is clamped on this connector or this connection, advantageously via a metal shell or an electrically conductive collar or not to ensure the continuity of the electromagnetic shielding.
  • the end of the outer sheath is chemically treated when it is made of PTFE, to be fixed by gluing on the tip of heat-shrinkable material, for example by means of an epoxy glue.
  • This heat-shrinkable tip is made of a plastic material that can withstand high temperatures, such as a fluoroelastomer marketed under the trademark VITON or a silicone elastomer.
  • the ferrule or the clamping collar of the end of the shielding metal braid on the connector or the coupling is made of stainless steel or copper-nickel alloy, the metallic shielding braid being advantageously made of copper-nickel alloy.
  • the metal part of the connector or fitting on which is clamped the end of the metal shielding braid is made of titanium, this material being chosen for its lightness and its mechanical characteristics.
  • this titanium piece can be treated superficially and receive for example a layer of nickel deposited by chemical means.
  • the tubular braid of textile protection is in turn preferably made of aramid fibers such as those sold under the trademark NOMEX.
  • the harness according to the invention has the advantage of a weight gain of the order of 20% compared to the technologies used previously. It is also intended for use both in medium temperature areas and in high temperature areas. he resulting in a simplification of the manufacture of these harnesses, in terms of supply and assembly of their components.
  • the harness represented in figure 1 comprises a number of conductive elements 12 which are interconnected by taps 14 and which comprise at the ends of the harness a connector 16 for connection to an electronic system and connectors 18 for connection to sensors installed in various zones of a aircraft engine, for example in the area of a fan mounted at the inlet of a turbojet engine and in the compressor zone of this turbojet engine.
  • the harness of the figure 1 comprises a first conductive element 12, one end of which is equipped with the connector 16 for connection to the electronic system and the other end of which is connected by a bypass 14 to two other conductive elements 12, one of which is equipped at one end with a connector 18 connecting to a sensor and the other is connected by another branch 14 to two other conductive elements 12 equipped with connectors 18 for connection to sensors.
  • Each conductive element 12 comprises, as is best seen in figure 2 one or more electrically conductive cables or wires 20 for transmitting electrical signals between the electronic system and the sensors mounted on the motor, this or these electroconductive cables or wires being mounted in a tubular structure 22 for protection and sealing connected to its ends to a connector 16 or 18 and a branch 14.
  • the structure 22 comprises an inner textile tubular braid 24, which surrounds the conductor or conductors 20, a metallic tubular braid 26 of electromagnetic shielding, which surrounds the inner textile braid 24, and an outer jacket 28 of annular shape, surrounding the braided metal braid 26.
  • the inner textile braid 24 is made of aramid fibers of the type marketed under the trademark NOMEX.
  • the shielding braid is made of nickel-plated copper and the outer sheath 28 is made of PTFE (polytetrafluoroethylene).
  • the end of the sheath 28 is fixed, advantageously by gluing by means of an epoxy glue, on the end of a cylindrical tip 30 of heat-shrinkable plastic material, such as a fluoroelastomer of the type of those marketed under the brand VITON or alternatively a silicone elastomer.
  • the end of the sheath 28 receives a chemical treatment of the sodium-ammonia type for the removal of fluorine atoms on the surface of the sheath.
  • the heat-shrinkable tip 30 surrounds one end of a cylindrical piece 32 preferably made of titanium, which is fixed on a connector 16 or 18 and which has a cylindrical shank 34 on which the end of the metal braid 26 is clamped. by means of a ferrule or a metal collar 36 of stainless steel, covered by the heat-shrinkable tip 30.
  • the piece 32 made of titanium In order for the piece 32 made of titanium to ensure the continuity of the electromagnetic shielding, its surface is coated with a layer of nickel deposited chemically and on which the end of the metal braid 26 is clamped by the ferrule or collar 36.
  • the end of the tip 30 opposite to the outer sheath 28 has an annular internal hooking flange on an outer annular flange 40 of the cylindrical shank 34 of the piece 32.

Landscapes

  • Insulated Conductors (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Details Of Indoor Wiring (AREA)
  • Cable Accessories (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

The harness has conductive elements with connectors/branches at its ends, where each element has an electrically conducting wire (20) mounted in a tubular structure (22) of protection and shield. The structure has a sheath (28) with ringed structure, surrounding a metallic tubular braid (26) of the shield. An end of the sheath is fixed to a cylindrical end fitting (30) of thermo-retractable material. The end fitting fixes the sheath on the connector, and locks and fixes an end of the braid on a cylindrical piece (32) of the connector by intermediate of a metallic band (36).

Description

L'invention concerne un harnais électrique blindé ou double blindé et à double barrière d'étanchéité pour des zones à environnement sévère en termes de température, de vibrations et de perturbations électromagnétiques, telles par exemple qu'un turboréacteur ou un turbopropulseur.The invention relates to a shielded or double-shielded electrical harness with a double sealing barrier for areas with a severe environment in terms of temperature, vibrations and electromagnetic disturbances, such as for example a turbojet or a turboprop.

Un harnais de ce type comprend un ensemble de fils et de câbles électriques qui assurent par exemple la liaison entre différents équipements électriques tels qu'un système de régulation électronique moteur ou des capteurs.A harness of this type comprises a set of electric wires and cables which for example provide the connection between different electrical equipment such as a motor electronic control system or sensors.

Actuellement, deux technologies différentes sont utilisées pour l'assemblage des harnais électriques, en fonction des températures régnant dans leurs zones d'utilisation. Lorsque la température maximale dans ces zones ne dépasse pas 150°C, on utilise en général pour protéger les câbles et fils électriques de liaison, une structure comprenant une tresse textile formant une première couche protectrice des câbles et fils électriques, une tresse tubulaire métallique de blindage électromagnétique entourant la tresse textile, et une gaine externe en polymère thermo-rétractable dont l'extrémité comporte un embout de polymère thermo-rétractable servant à protéger l'extrémité de la tresse de blindage sur une pièce tubulaire de raccordement métallique ou composite et à relier la gaine externe à cette pièce de raccordement. Cette structure a l'avantage d'accepter des rayons de courbure relativement faibles mais sa tenue thermique est limitée à 150°C.Currently, two different technologies are used for the assembly of electrical harnesses, according to the temperatures prevailing in their areas of use. When the maximum temperature in these zones does not exceed 150 ° C., a structure comprising a textile braid forming a first protective layer of electrical cables and wires is generally used to protect the electrical cables and wires, a metallic tubular braid of electromagnetic shielding surrounding the textile braid, and an outer sheath of heat-shrinkable polymer whose end comprises a thermo-retractable polymer tip for protecting the end of the shielding braid on a tubular piece of metal or composite connection and to connect the outer sheath to this connection piece. This structure has the advantage of accepting relatively small radii of curvature, but its thermal resistance is limited to 150 ° C.

Dans les zones où la température est plus élevée et peut atteindre 260°C en pointe, on utilise une structure tubulaire de protection des câbles et fils électriques qui comprend une gaine interne en PTFE (polytétrafluoroéthylène), une tresse métallique de blindage électromagnétique qui entoure cette gaine, et une tresse textile qui entoure la tresse de blindage et qui est réalisée en une matière supportant des températures élevées, par exemple en fibres aramides, l'extrémité de cette structure étant fixée par un collier mécanique sur une pièce de raccordement métallique ou composite.In areas where the temperature is higher and can reach 260 ° C peak, a tubular protection structure of electrical cables and wires is used which includes an inner sheath of PTFE (polytetrafluoroethylene), a braided electromagnetic shielding braid surrounding this sheath, and a textile braid which surrounds the braid of shielding and which is made of a material supporting high temperatures, for example aramid fibers, the end of this structure being fixed by a mechanical collar on a metal or composite connection piece.

L'inconvénient de cette structure est qu'elle est plus lourde que la précédente et n'accepte pas les petits rayons de courbure.The disadvantage of this structure is that it is heavier than the previous one and does not accept small radii of curvature.

Le document EP-A1-0693811 décrit un harnais électrique comprenant des conducteurs électriques placés dans une structure tubulaire de protection qui comprend une gaine en caoutchouc ou en matière textile entourant les conducteurs, une tresse en cuivre entourant cette gaine, une gaine isolante entourant la tresse en cuivre, et une gaine métallique annelée qui entoure la gaine isolante. Le nombre de composants de cette structure complique son montage, et augmente son coût et son poids. Ce nombre de composants ne permet pas non plus de donner un faible rayon de courbure à cette structure connue.The document EP-A1-0693811 discloses an electrical harness comprising electrical conductors placed in a tubular protective structure which comprises a rubber or textile sheath surrounding the conductors, a copper braid surrounding the sheath, an insulating sheath surrounding the copper braid, and a metallic sheath ring around the insulating sheath. The number of components of this structure complicates its assembly, and increases its cost and weight. This number of components does not allow to give a small radius of curvature to this known structure.

La présente invention a pour objet une structure unique de protection et de liaison de câbles et fils électriques du type précité, qui ne présente pas les inconvénients des structures connues, qui puisse être utilisée aussi bien dans les zones à température maximale de 150°C environ que dans les zones où la température atteint 260°C en pointe, et qui accepte des rayons de courbure relativement faibles.The present invention relates to a single structure for protecting and connecting cables and electrical wires of the aforementioned type, which does not have the drawbacks of known structures, which can be used both in zones with a maximum temperature of about 150 ° C. only in areas where the temperature reaches 260 ° C peak, and which accepts relatively small radii of curvature.

L'invention propose, à cet effet, un harnais électrique blindé et étanche, en particulier pour moteur d'avion, selon la revendication 1.The invention proposes, for this purpose, a shielded and sealed electrical harness, in particular for an aircraft engine, according to claim 1.

La gaine externe est réalisée en une matière supportant les températures élevées, par exemple en PTFE, et sa structure annelée lui permet d'accepter les faibles rayons de courbure.The outer sheath is made of a high temperature material, for example PTFE, and its annular structure allows it to accept small radii of curvature.

L'embout de matière thermo-rétractable, qui est fixé à l'extrémité de cette gaine externe, permet d'assurer la fixation de la gaine sur un connecteur ou un raccord de dérivation. L'extrémité de la tresse métallique de blindage est serrée sur ce connecteur ou ce raccord, avantageusement par l'intermédiaire d'une virole métallique ou d'un collier électriquement conducteur ou non pour assurer la continuité du blindage électromagnétique.The tip of heat-shrinkable material, which is attached to the end of this outer sheath, ensures the attachment of the sheath on a connector or branch connection. The end of the metal shielding braid is clamped on this connector or this connection, advantageously via a metal shell or an electrically conductive collar or not to ensure the continuity of the electromagnetic shielding.

Dans un mode de réalisation préféré de l'invention, l'extrémité de la gaine externe est traitée chimiquement quand elle est réalisée en PTFE, pour pouvoir être fixée par collage sur l'embout de matière thermo-rétractable, par exemple au moyen d'une colle époxy.In a preferred embodiment of the invention, the end of the outer sheath is chemically treated when it is made of PTFE, to be fixed by gluing on the tip of heat-shrinkable material, for example by means of an epoxy glue.

Cet embout thermo-rétractable est en une matière plastique supportant les températures élevées, telle notamment qu'un élastomère fluoré commercialisé sous la marque VITON ou un élastomère silicone. La virole ou le collier de serrage de l'extrémité de la tresse métallique de blindage sur le connecteur ou le raccord est en acier inoxydable ou en alliage cuivre-nickel, la tresse métallique de blindage étant avantageusement en alliage cuivre-nickel.This heat-shrinkable tip is made of a plastic material that can withstand high temperatures, such as a fluoroelastomer marketed under the trademark VITON or a silicone elastomer. The ferrule or the clamping collar of the end of the shielding metal braid on the connector or the coupling is made of stainless steel or copper-nickel alloy, the metallic shielding braid being advantageously made of copper-nickel alloy.

De préférence, la pièce métallique du connecteur ou du raccord sur laquelle est serrée l'extrémité de la tresse métallique de blindage est en titane, ce matériau étant choisi pour sa légèreté et ses caractéristiques mécaniques.Preferably, the metal part of the connector or fitting on which is clamped the end of the metal shielding braid is made of titanium, this material being chosen for its lightness and its mechanical characteristics.

Pour assurer la continuité du blindage électromagnétique, cette pièce en titane peut être traitée superficiellement et recevoir par exemple une couche de nickel déposée par voie chimique.To ensure the continuity of the electromagnetic shielding, this titanium piece can be treated superficially and receive for example a layer of nickel deposited by chemical means.

La tresse tubulaire de protection textile est quant à elle réalisée de préférence en fibres aramides telles que celles commercialisées sous la marque NOMEX.The tubular braid of textile protection is in turn preferably made of aramid fibers such as those sold under the trademark NOMEX.

De façon générale, le harnais selon l'invention présente l'avantage d'un gain de poids de l'ordre de 20 % par rapport aux technologies utilisées antérieurement. Il est de plus destiné à être utilisé aussi bien dans les zones à température moyenne que dans les zones à température élevée. Il en résulte une simplification de la fabrication de ces harnais, en termes d'approvisionnement et d'assemblage de leurs composants.In general, the harness according to the invention has the advantage of a weight gain of the order of 20% compared to the technologies used previously. It is also intended for use both in medium temperature areas and in high temperature areas. he resulting in a simplification of the manufacture of these harnesses, in terms of supply and assembly of their components.

L'invention sera mieux comprise et d'autres détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement à la lecture de la description qui suit, faite à titre d'exemple en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue schématique d'un harnais électrique de moteur d'avion ;
  • la figure 2 est une demi-vue schématique en coupe axiale de l'extrémité d'un élément conducteur de ce harnais.
The invention will be better understood and other details, characteristics and advantages thereof will appear more clearly on reading the description which follows, given by way of example with reference to the accompanying drawings in which:
  • the figure 1 is a schematic view of an aircraft engine electrical harness;
  • the figure 2 is a schematic half-view in axial section of the end of a conductive element of this harness.

Le harnais représenté en figure 1 comprend un certain nombre d'éléments conducteurs 12 qui sont reliés entre eux par des dérivations 14 et qui comportent aux extrémités du harnais un connecteur 16 de liaison à un système électronique et des connecteurs 18 de liaison à des capteurs installés dans diverses zones d'un moteur d'avion, par exemple dans la zone d'une soufflante montée à l'entrée d'un turboréacteur et dans la zone du compresseur de ce turboréacteur.The harness represented in figure 1 comprises a number of conductive elements 12 which are interconnected by taps 14 and which comprise at the ends of the harness a connector 16 for connection to an electronic system and connectors 18 for connection to sensors installed in various zones of a aircraft engine, for example in the area of a fan mounted at the inlet of a turbojet engine and in the compressor zone of this turbojet engine.

Plus précisément, le harnais de la figure 1 comprend un premier élément conducteur 12 dont une extrémité est équipée du connecteur 16 de liaison au système électronique et dont l'autre extrémité est reliée par une dérivation 14 à deux autres éléments conducteurs 12 dont l'un est équipé à une extrémité d'un connecteur 18 de liaison à un capteur et dont l'autre est relié par une autre dérivation 14 à deux autres éléments conducteurs 12 équipés de connecteurs 18 de liaison à des capteurs.More specifically, the harness of the figure 1 comprises a first conductive element 12, one end of which is equipped with the connector 16 for connection to the electronic system and the other end of which is connected by a bypass 14 to two other conductive elements 12, one of which is equipped at one end with a connector 18 connecting to a sensor and the other is connected by another branch 14 to two other conductive elements 12 equipped with connectors 18 for connection to sensors.

Chaque élément conducteur 12 comprend, comme on le voit mieux en figure 2, un ou plusieurs câbles ou fils électroconducteurs 20 servant à la transmission de signaux électriques entre le système électronique et les capteurs montés sur le moteur, ce ou ces câbles ou fils électroconducteurs étant montés dans une structure tubulaire 22 de protection et d'étanchéité raccordée à ses extrémités à un connecteur 16 ou 18 et à une dérivation 14.Each conductive element 12 comprises, as is best seen in figure 2 one or more electrically conductive cables or wires 20 for transmitting electrical signals between the electronic system and the sensors mounted on the motor, this or these electroconductive cables or wires being mounted in a tubular structure 22 for protection and sealing connected to its ends to a connector 16 or 18 and a branch 14.

Selon l'invention, la structure 22 comprend une tresse tubulaire textile interne 24, qui entoure le ou les conducteurs 20, une tresse tubulaire métallique 26 de blindage électromagnétique, qui entoure la tresse textile interne 24, et une gaine externe 28 de forme annelée, qui entoure la tresse métallique de blindage 26.According to the invention, the structure 22 comprises an inner textile tubular braid 24, which surrounds the conductor or conductors 20, a metallic tubular braid 26 of electromagnetic shielding, which surrounds the inner textile braid 24, and an outer jacket 28 of annular shape, surrounding the braided metal braid 26.

La tresse textile interne 24 est réalisée en fibres aramides du type de celles commercialisées sous la marque NOMEX.The inner textile braid 24 is made of aramid fibers of the type marketed under the trademark NOMEX.

La tresse de blindage est en cuivre nickelé et la gaine externe 28 est en PTFE (polytétrafluoroéthylène).The shielding braid is made of nickel-plated copper and the outer sheath 28 is made of PTFE (polytetrafluoroethylene).

L'extrémité de la gaine 28 est fixée, avantageusement par collage au moyen d'une colle époxy, sur l'extrémité d'un embout cylindrique 30 de matière plastique thermo-rétractable, telle qu'un élastomère fluoré du type de ceux commercialisés sous la marque VITON ou en variante un élastomère silicone.The end of the sheath 28 is fixed, advantageously by gluing by means of an epoxy glue, on the end of a cylindrical tip 30 of heat-shrinkable plastic material, such as a fluoroelastomer of the type of those marketed under the brand VITON or alternatively a silicone elastomer.

Pour permettre sa fixation par collage sur l'embout 30, l'extrémité de la gaine 28 reçoit un traitement chimique du type sodium ammoniac pour la suppression des atomes de fluor en surface de la gaine.To allow its attachment by gluing on the tip 30, the end of the sheath 28 receives a chemical treatment of the sodium-ammonia type for the removal of fluorine atoms on the surface of the sheath.

L'embout thermo-rétractable 30 entoure une extrémité d'une pièce cylindrique 32 réalisée de préférence en titane, qui se fixe sur un connecteur 16 ou 18 et qui comporte une queue cylindrique 34 sur laquelle l'extrémité de la tresse métallique 26 est serrée au moyen d'une virole ou d'un collier métallique 36 en acier inoxydable, recouvert par l'embout thermo-rétractable 30.The heat-shrinkable tip 30 surrounds one end of a cylindrical piece 32 preferably made of titanium, which is fixed on a connector 16 or 18 and which has a cylindrical shank 34 on which the end of the metal braid 26 is clamped. by means of a ferrule or a metal collar 36 of stainless steel, covered by the heat-shrinkable tip 30.

Pour que la pièce 32 en titane puisse assurer la continuité du blindage électromagnétique, sa surface est revêtue d'une couche de nickel déposée par voie chimique et sur laquelle l'extrémité de la tresse métallique 26 est serrée par la virole ou le collier 36.In order for the piece 32 made of titanium to ensure the continuity of the electromagnetic shielding, its surface is coated with a layer of nickel deposited chemically and on which the end of the metal braid 26 is clamped by the ferrule or collar 36.

L'extrémité de l'embout 30 opposée à la gaine extérieure 28 comporte un rebord annulaire interne d'accrochage sur un rebord annulaire externe 40 de la queue cylindrique 34 de la pièce 32.The end of the tip 30 opposite to the outer sheath 28 has an annular internal hooking flange on an outer annular flange 40 of the cylindrical shank 34 of the piece 32.

Claims (9)

  1. A shielded and sealed electric harness, in particular for an airplane engine, comprising a set of conductor elements (12) fitted at their ends with connectors (16, 18) or branch joints (14), each conductor element (12) comprising at least one electrically conductive wire or cable (20) mounted in a tubular protective and shielding structure (22) that comprises a tubular inner textile braid (24) and an intermediate metal braid (26) for electromagnetic shielding, the harness being characterized in that the tubular structure (22) also comprises a corrugated outer sheath (28) made of polymer, surrounding the shielding metal braid (26) and having at least one end secured to a tubular endpiece (30) of heat-shrink material, said tubular endpiece (30) enabling the outer sheath (28) to be fastened onto a connector (16, 18) or a branch joint, and serving to clamp and secure one end of the shielding metal braid (26), by means of a metal collar or ferrule (36) onto a tubular metal part (32) of the connector (16, 18) or of the branch joint (14).
  2. A harness according to claim 1, characterized in that the outer sheath (22) is made of polytetrafluoroethylene.
  3. A harness according to claim 2, characterized in that the end of the outer sheath (22) is chemically treated to enable it to be adhesively bonded onto the endpiece (30) of heat-shrink material, e.g. by means of an epoxy adhesive.
  4. A harness according to any preceding claim, characterized in that the heat-shrink endpiece (30) is made of a fluorinated elastomer of the Viton type, or of silicone.
  5. A harness according to any preceding claim, characterized in that the collar or ferrule (36) for clamping and securing the end of the metal braid (26) on the metal part (32) is made of stainless steel or of copper-nickel alloy.
  6. A harness according to any preceding claim, characterized in that the shielding metal braid (26) is made of copper-nickel alloy.
  7. A harness according to any preceding claim, characterized in that the metal part (32) is made of titanium.
  8. A harness according to claim 7, characterized in that the metal part (32) receives an electrically conductive surface coating so as to provide continuity of electromagnetic shielding.
  9. A harness according to any preceding claim, characterized in that the textile inner braid (24) is made of aramid fibers.
EP07290601A 2006-05-19 2007-05-11 Shielded electrical harness, in particular for an airplane engine Active EP1858116B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0604487A FR2901423B1 (en) 2006-05-19 2006-05-19 SHIELDED ELECTRIC HARNESS, IN PARTICULAR FOR AIRCRAFT ENGINE

Publications (2)

Publication Number Publication Date
EP1858116A1 EP1858116A1 (en) 2007-11-21
EP1858116B1 true EP1858116B1 (en) 2009-10-28

Family

ID=37684896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07290601A Active EP1858116B1 (en) 2006-05-19 2007-05-11 Shielded electrical harness, in particular for an airplane engine

Country Status (15)

Country Link
US (1) US7687714B2 (en)
EP (1) EP1858116B1 (en)
JP (1) JP5239067B2 (en)
CN (1) CN100595977C (en)
AT (1) ATE447246T1 (en)
BR (1) BRPI0702343A (en)
CA (1) CA2588954C (en)
DE (1) DE602007002945D1 (en)
ES (1) ES2335241T3 (en)
FR (1) FR2901423B1 (en)
IL (1) IL183228A (en)
MA (1) MA29900B1 (en)
MX (1) MX2007005966A (en)
RU (1) RU2406172C2 (en)
UA (1) UA91840C2 (en)

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Also Published As

Publication number Publication date
CN101075708A (en) 2007-11-21
IL183228A (en) 2012-10-31
BRPI0702343A (en) 2008-01-15
ATE447246T1 (en) 2009-11-15
JP5239067B2 (en) 2013-07-17
IL183228A0 (en) 2007-09-20
US20070270037A1 (en) 2007-11-22
FR2901423B1 (en) 2010-11-26
DE602007002945D1 (en) 2009-12-10
CN100595977C (en) 2010-03-24
MA29900B1 (en) 2008-11-03
MX2007005966A (en) 2008-12-08
CA2588954A1 (en) 2007-11-19
RU2007118603A (en) 2008-11-27
FR2901423A1 (en) 2007-11-23
EP1858116A1 (en) 2007-11-21
CA2588954C (en) 2014-07-08
UA91840C2 (en) 2010-09-10
RU2406172C2 (en) 2010-12-10
JP2007311356A (en) 2007-11-29
US7687714B2 (en) 2010-03-30
ES2335241T3 (en) 2010-03-23

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