FR2786912A1 - ELECTRICAL CONNECTION CABLE - Google Patents

Abstract

The connecting cable (10) holds a bundle of wires (16) and has a sleeve (18) defining an internal passage in the cable to allow insertion of supplementary wires at a later time. The initial bundle of wires (16) lies outside this internal sleeve.

Description

The present invention relates to an electrical connection cable of the type

  comprising a bundle of initial conducting wires and a sheath

  internally delimiting a passage reserved for the installation of wires

additional conductors.

  Such electrical connection cables are used in aircraft in order to electrically connect different electrically controlled members. These cables run through the receiving housing of the

  landing gear. They must therefore be resistant to external aggression.

  res, since they are exposed, in these homes, directly to the environment-

  outside the plane. They are then subjected to electromagnetic disturbances.

  genetic and external aggressions. In addition, the cables must be

  flexible to allow easy assembly and disassembly.

  In known electrical connection cables, the bundle of conductive wires is disposed inside a sheath with an oversized inner diameter, so that it internally delimits a reserved passage.

  allowing the subsequent introduction of additional wires.

  Additional wires may indeed be required in case

  installation of new electrical equipment or during improvements

brought to the plane.

  The introduction of new wires in the reserved passage delimited by

  the sheath is a delicate operation, the new threads introduced become blocked

  as often by mingling with the initial threads. Experience shows that wires cannot be inserted into cables with a length

  greater than four meters. Also, break boxes are provided, in-

  beating the scabbard at regular intervals. These break boxes are

  less than four meters apart. They allow access to the circu-

lant inside the sheath.

  The presence of switch boxes increases the cost of wiring and makes it difficult to install in landing gear. It reduces by

  plus the electromagnetic protection of the cable, especially at high frequencies

  frequencies, i.e. for frequencies above 300 kHz.

  In addition, the mass of the cable is important given the diameter

  important of the sheath and the presence of the boxes of clippings.

  The object of the invention is to provide an electrical connection cable making it possible to easily add additional conductive wires to

  sections of great length and having a reduced mass.

  To this end, the invention relates to an electrical connection cable

  as of the aforementioned type, characterized in that the bundle of initial conductive wires is disposed outside the sheath, and in that the cable comprises means for retaining the bundle of conductive wires

initials along the scabbard.

  According to particular embodiments, the connection cable

  ment comprises one or more of the following characteristics: - it comprises at least one drawing needle extending inside the sheath; the means for retaining the bundle of initial conducting wires and the sheath comprise an external protective envelope in which the bundle of initial conducting wires and the sheath are housed; - The outer casing includes, inside, a tape for holding the bundle of initial conducting wires against the sheath;

  - the outer casing includes an electro-shielding braid

  genetics; - The outer envelope includes a mechanical and / or thermal protection sheath;

  - It has at least one end a tip defining a step-

  wise for the bundle of initial conducting wires, and the sheath enters said passage and emerges in the passage or beyond it; the sheath is delimited by a tubular wall comprising, along its length, successive projections and recesses; the passage section delimited by the sheath is equal to at least% of the total section of the bundle of initial conducting wires; and - the bundle of conducting wires and the sheath are twisted to form

a strand.

  The invention will be better understood on reading the description which will

  follow, given only as an example and made with reference to the

  sins, in which: FIG. 1 is a view in longitudinal section of an end section of a cable according to the invention; and Figure 2 is a sectional view of the current part of the cable of the

figure 1.

  In Figure 1 is shown an end section 10 of an electrical connection cable according to the invention. It is provided at its end with a crossing 12 ensuring the mechanical connection of the cable with a wall 14 of a

  electrical equipment to which the cable is connected 10.

  The cable 10 comprises a bundle 16 of initial conducting wires and a sheath 18 internally delimiting a passage reserved for the installation

  subsequent additional conductor wires.

  The bundle 16 of initial conducting wires extends outwardly along the sheath 18. The bundle and the tube are held one against the other

  by a multilayer outer shell 20.

  The harness 16 is made up of insulated and possibly-

  shielded, formed of single wires, or of pairs or thirds of twisted wires. These wires are partially distributed around the sheath 18, being concentrated on the same side, as shown in FIG. 2. They delimit

  thus, in section, a crescent moon.

  Advantageously, in order to improve the flexibility of the cable, the assembly formed by the bundle 16 of conductive wires and the sheath 18 is twisted to form a strand. The beam 16 and the sleeve 18 then describe nested propellers.

  The sheath 18 consists of a corrugated tube. Thus, it comprises,

  its length, an alternation of cylindrical sections of diameters

  tincts. More generally, the sheath 18 is advantageously delimited by a tubular wall comprising, along its length, projections and successive recesses. Preferably, the inner section of the sheath 18 is greater than

  0.25 times the cross section of the bundle 16 of initial conducting wires.

  The sleeve 18 is made of PTFE (Poly (tetrafluoroethylene)) or PEEK (Polyether (etheracetone)). The envelope 20, ensuring the protection and the retention of the bundle 16 and of the sheath 18, includes an internal taping 22 formed by a PTFE or polyester tape. The ribbon is wound in helical form with 50% overlap around the bundle 16 and the sheath 18. The ribbon 22 prevents wear of the conductive wires and makes it possible to ensure their cohesion during the manufacture of the cable, and in particular during the establishment of the other layers of the envelope 20.

  As a variant, the ribbon constituting the ribbon 22 is arranged along the

  linearly around the bundle 16 and the sheath 18, the longitudinal edges of the ribbon being attached to one another with an overlap greater than%. The envelope 20 further comprises, tightened around the internal layer 22, a shielding braid 24, ensuring the electromagnetic protection of the

  cable vis-à-vis the disturbances encountered in its environment.

  The shielding braid 24 is formed, for example, from round copper wires.

  glass nickel braided in a manner known per se.

  The shielding braid is produced, for example by overstressing. As a variant, the bundle 16 and the banded sheath 18 are threaded into the braid

  shield 24, previously manufactured.

  The envelope 20 has on the outside a protective sheath 26

  canic. This consists for example of a textile braid or a heat-shrinkable sheath, for example made of NOMEX. The NOMEX is

  marketed by the company Du Pont de Nemours.

  Furthermore, a drawing needle 28 is initially disposed at

  inside the sheath 18. It opens at its two ends.

  This pulling needle allows the subsequent introduction of conduc-

  additional torers from one end by attaching these to the needle

  draw. Pulling the pull needle from the opposite end allows

  puts lead conductive wires added along the entire length of the

scabbard 18.

  As shown in FIG. 1, the connection cable 10 comprises

  advantageously carries at its end a crossing 12 defining a step

  sage 30 for the wire harness 16. The wire 16 and the

  reau 18 bandés enter passage 30 and lead advantageously

  beyond this. In particular, the sheath 18 advantageously penetrates

  sement in said passage and leads into it or beyond it, which allows the introduction of additional conductive wires through

  of the sheath 18 from inside the equipment delimited by the wall 14.

  The mechanical protection sheath 26 and the shielding braid 24 are interrupted on the bushing 12 which they partially cover. The sheath 26 and the braid 24 are electrically and mechanically linked to the bushing

  12 along successive stepped sections 32, 34 on which they are placed

plicated.

  With a connection cable as described here, additional wires

  can be later easily introduced into the sheath 18 without risk of blocking and entanglement with the initial conductive wires

constituting the bundle 16.

  Thus, the electrical connection cables can reach lengths of 10 m without a break box, while allowing the addition of wires

additional.

  The cable described here has a passage 12 ensuring the connection of the cable to the housing of electrical equipment. As a variant, the cable comprises a connector and the sheath 18 then advantageously opens out at

  inside the connector housing.

  More generally, the cable may comprise at least one end

  tee, a nozzle defining a passage in which, or beyond which, the

reau 18 opens.

Claims (10)

  1.- Electrical connection cable (10) comprising a bundle (16) of initial conducting wires and a sheath (18) internally delimiting a passage reserved for the installation of additional conducting wires, characterized in that the bundle (16) of initial conductive wires is disposed outside the sheath (18), and in that the cable (10) comprises means (20) for retaining the bundle (16) of initial conductive wires along sheath (18).   2.- cable according to claim 1, characterized in that it comprises at   at least one drawing needle (28) extending inside the sheath (18).   3.- Cable according to claim 1 or 2, characterized in that the   means for retaining the bundle (16) of initial conducting wires and the furnace   reau (18) comprise an external protective envelope (20) in which are housed the bundle (16) of initial conducting wires and the sheath (18).   4.- cable according to claim 3, characterized in that the envelope   external (20) has, inside, a tape (22) for holding the beam   hoop (16) of initial conducting wires against the sheath (18).   5.- Cable according to claim 3 or 4, characterized in that   The outer casing (20) comprises an electromagnetic shielding braid that (24).   6.- Cable according to any one of claims 3 to 5, character-   in that the outer casing (20) has a protective sheath mechanical (26) and / or thermal.   7.- Cable according to any one of the preceding claims,   characterized in that it comprises at at least one end a nozzle (12) delimiting a passage (30) for the bundle (16) of initial conducting wires, and in that the sheath (18) penetrates into said passage (30) and leads   in the passage (30) or beyond it.   8.- Cable according to any one of the preceding claims,   characterized in that the sheath (18) is delimited by a tubular wall   comprising, along its length, successive projections and recesses.   9. Cable according to any one of the preceding claims,   characterized in that the passage section delimited by the sheath (18)   is equal to at least 25% of the total cross section of the bundle (16) of wires initial ductors.   10.- Cable according to any one of the preceding claims,   characterized in that the bundle (16) of conductive wires and the sheath (18) are twisted to form a strand.