EP0655750B1 - Câble résistive à haute tension du type à bobine pour supprimer le bruit - Google Patents

Câble résistive à haute tension du type à bobine pour supprimer le bruit Download PDF

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Publication number
EP0655750B1
EP0655750B1 EP19940118130 EP94118130A EP0655750B1 EP 0655750 B1 EP0655750 B1 EP 0655750B1 EP 19940118130 EP19940118130 EP 19940118130 EP 94118130 A EP94118130 A EP 94118130A EP 0655750 B1 EP0655750 B1 EP 0655750B1
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EP
European Patent Office
Prior art keywords
rubber layer
layer
core
cable
conductor
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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.)
Expired - Lifetime
Application number
EP19940118130
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German (de)
English (en)
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EP0655750A2 (fr
EP0655750A3 (fr
Inventor
Terutsugu C/O Sumitomo Wiring Sys Ltd Fujimoto
Makoto Higashikozono
Inoue C/O Sumitomo Wiring Sys Ltd Hiroshi
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Sumitomo Wiring Systems Ltd
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Sumitomo Wiring Systems Ltd
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Publication of EP0655750A2 publication Critical patent/EP0655750A2/fr
Publication of EP0655750A3 publication Critical patent/EP0655750A3/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0063—Ignition cables

Definitions

  • the present invention relates to a coil type high-voltage or high-tension resistive cable for preventing noise which is used, for example, as an ignition cable in an internal combustion engine and is particularly designed to obtain a satisfactory dielectric strength without reducing a noise preventing effect with a thin resistive cable having an outer diameter of 5 mm or smaller.
  • a high-voltage resistive or resistant or resistance cable is structured as shown in Fig. 2.
  • a rubber layer 2 is formed around the outer circumferential surface of a core 1 made of a bundle of high-strength fibers such as aramid fibers, and a resistance wire 3 is wound around the outer circumferential surface of the rubber layer 2 in a direction normal to the longitudinal axis of the core 1, thereby forming a conductor 4.
  • An insulator layer 5, a net 6 made of glass fibers and a sheath 7 are formed around the outer circumferential surface of the conductor 4, i.e., over the resistance wire one after another in this order.
  • DE-A-4034197 refers to a coil type high-voltage resistive cable for preventing noise, and method for making, comprising : an elongated core (2) of reinforced fibers, a rubber layer (3) of a noise preventing powder and a hard rubber material coating said core (2), a resistance wire (4) wound around the outer circumferential surface of said rubber layer (3) in a direction normal to the longitudinal axis of said elongated core (2), thereby forming a conductor (1) with said core (2) and said rubber layer (3), an intermediate layer means with an insulating layer (5), a net (6) and a sheath (7) being formed around the outer circumferential surface of the conductor (1) one over another in this order, such that the obtained coil type high-voltage resistive cable has an outer diameter of 5mm or smaller.
  • EP-A-0 329 188 concerns a noise suppressing high-voltage cable comprising an elongated core of reinforced fibers having an outer circumferential surface, a ferrite rubber layer consisting of a fluororubber material with a high concentration of a noise preventing conductive ferrite powder coating said core, a resistance wire wound around the outer circumferential surface of said ferrite rubber layer in a direction normal to the longitudinal axis of said elongated core, thereby forming a conductor with said core and said coated ferrite rubber layer, intermediate layers surrounding said conductor firstly with a release agent and secondly with an insulating layer, a net surrounding said intermediate layers and finally a sheath surrounding said net.
  • US-A-4 700 171 refers to an automotive ignition wire with a high temperature rating, excellent electrical insulating properties, heat resistance, oil resistance and abrasion resistance.
  • the wire utilizes a conductor made up of either a metal conductor helically wound on a radio frequency insulating polymer overcoated on a polymer adhesive layer on a glass fiber bundle; or a glass fiber-cotton fiber braid on a graphite impregnated glass layer.
  • Overcoating either one of the conductors is a semiconducting polymer layer, an ethylene-propylene-diene monomer containing polymer layer optionally overcoated with a glass braid layer and a polymer jacket material.
  • the polymer jacket material comprises a polymeric mixture of ethylene vinyl acetate and ethylene-propylene-diene monomer stabilized with a mixture of phenolic antioxidant and a metal salt antioxidant.
  • a magnetic material such as ferrite powder has been mixed in the rubber layer 2 in order to improve the noise preventing performance and the resistance wire is wound densely at a small pitch in order to make the inductance per unit length larger.
  • the resistance wire is wound around the rubber layer in an unvulcanized state so that it cuts in the rubber layer, and the rubber layer is then vulcanized (Japanese Unexamined Patent Publication No. 63-168915) or the resistance wire is wound such that it cuts in the already vulcanized rubber layer (Japanese Unexamined Patent Publication No. 3-184213).
  • a high-voltage resistive cable designed to eliminate a resistance value variation, which cable is provided with an inner conductor layer over the resistance wire 3.
  • a bundling layer 8 made of resin is formed around the outer circumferential surface of the core 1 and the resistance wire 3 is wound around the outer circumferential surface of the bundling layer 8.
  • a partially conductive silicone rubber layer 9 which acts as an inner conductor layer is formed over the resistance wire 3 by means of extrusion, and the insulator layer 5, the net 6 and the sheath 7 are formed around the outer circumferential surface of the silicone rubber layer 9 one over another in this order (Japanese Unexamined Patent Publication No. 60-3809).
  • a high-voltage resistive cable designed to have a small diameter.
  • a core is immersed in liquid resin so that fibers making up the core are combined and a liquid rubber coating material including silicone rubber and ethylene propylene rubber is applied to the surface of the core.
  • a resistance wire is wound around the outer circumferential surface of this coat, and an insulator layer, a net and a sheath are formed over the resistance wire one over another in this order (Japanese Unexamined Patent Publication No. 63-69107).
  • the high-voltage resistive cables of the above types are required to have an outer diameter of 5 mm or smaller so that they can be bent freely in a densely stuffed engine compartment and are also required to have a distributed capacitance of 80 pF/m or smaller in order to prevent a voltage reduction.
  • the high-voltage resistive cables are required to have a specified dielectric strength against this high voltage.
  • the conventional high-voltage resistive cables cannot have a specified dielectric strength without reducing the noise preventing effect.
  • the rubber layer containing a magnetic material such as ferrite powder displays a noise preventing effect.
  • this rubber layer has a large thickness and the inner conductor layer cannot be provided between the resistance wire and the insulator layer in order for the high-voltage resistive cable to have an outer diameter of 5 mm or smaller. Since the resistance wire is directly coated with the insulator layer and no inner conductor layer is provided therebetween, the dielectric strength cannot be increased.
  • the high-voltage resistive cable obtained by applying the liquid rubber coating material to the surface of the core and winding the resistance wire around the rubber coat is allowed to have a small outer diameter.
  • this resistive cable the noise preventing effect is reduced since the liquid rubber does not contain ferrite powder and the dielectric strength cannot be increased since no inner conductor layer is provided.
  • a coil type high-voltage resistive cable for preventing noise comprising an elongated core of reinforced fibers, a rubber layer, preferably a fluoro-ferrite rubber layer of a noise preventing powder, preferably ferrite and a hard rubber material, preferably fluororubber coating said core, a resistance wire wound around the outer circumferential surface of said rubber layer in a direction normal to the longitudinal axis of said elongated core, thereby forming a conductor with said core and said rubber layer, an intermediate layer means surrounding said conductor with a release agent an inner conductor layer and with an insulating layer, a net surrounding said intermediate layers, and a sheath surrounding said net, coating the combination of said conductor and said intermediate layers with an outer diameter of 5 mm or smaller and a method for making a coil type high-voltage resistive cable for preventing noise, said method comprising the steps of providing an elongated core made of reinforced fibers, applying a rubber layer, preferably a
  • a preferred embodiment of the invention is directed to a coil type high-voltage resistive cable for preventing noise, wherein a coating material obtained by mixing fluororubber and ferrite powder is applied to the outer circumferential surface of a core mace of reinforced fibers to form a rubber layer, that a resistance wire is wound around the outer circumferential surface of the rubber layer in a direction normal to the axis of the core, thereby obtaining a conductor having an outer diameter of 0.6 mm or smaller, and that an inner conductor layer formed of partially conductive material, a resin layer, a net and a sheath are formed around the outer circumferential surface of the conductor one over another in this order such that the obtained coil type high-voltage resistive cable has an outer diameter of 5 mm or smaller.
  • the rubber layer is preferably formed of the coating material obtained by mixing 300 to 500 parts by weight of ferrite powder with 100 parts by weight of fluororubber.
  • the inner conductor layer is preferably formed by extruding partially conductive polyolefin resin.
  • the inner conductor layer may be formed by means of extrusion after applying a release agent to the outer circumferential surface of the conductor.
  • the rubber layer of the conductor is formed by applying the fluororubber coating material containing a high concentration of ferrite powder to the outer circumferential surface of the core. Accordingly, the rubber layer is allowed to have a small thickness while the noise preventing performance is not reduced. This enables the partially conductive inner conductor layer for improving the dielectric strength to be formed between the conductor and the insulator layer by means of extrusion.
  • Fig. 1 shows an embodiment of a coil type high-voltage resistive cable 1 according to the invention.
  • the outer circumferential surface of a core 11 is coated with a rubber layer 12, a resistance wire 13, a release agent 14, an inner conductor layer 15, an insulator layer 16, a net 17 and a sheath 18 one over another in this order.
  • the core 11 is obtained by twisting reinforced fibers such as aramid fibers and glass fibers.
  • reinforced fibers such as aramid fibers and glass fibers.
  • three reinforced fibers having 400 denier are twisted to make up the core 11 having an outer diameter of 0.4 mm to 0.45 mm.
  • the rubber layer 12 is formed by immersing the core 11 in a liquid fluororubber based coating material obtained by mixing ferrite powder with fluororubber and dissolving this mixture in an organic solvent.
  • a mixing weight ratio of fluororubber to ferrite powder in the coating material is set at 100 : 400 in this embodiment.
  • the rubber layer 12 contains a high concentration of ferrite powder having a noise preventing performance.
  • the rubber layer 12 is allowed to have an outer diameter of as small as 0.56 mm and a capacitance of 80 pF/m or smaller.
  • the rubber needs to be made softer so that it can be smoothly extruded.
  • the ferrite rubber is applied as a coating material. Since the rubber is dissolved in the solvent in this embodiment, hard rubber can be used.
  • the rubber layer 12 contains a high concentration of ferrite powder, a coating strength thereof is not reduced because of the use of hard rubber.
  • the resistance wire 13 a nichrome (Ni-Cr) wire having a diameter of 40 ⁇ m, is wound around the outer circumferential surface of the rubber layer 12 densely at a small pitch (10000 winds/m) in a direction normal to the longitudinal axis of the core 11 by a winding machine.
  • the resistance wire 13 is wound before the applied ferrite rubber is completely vulcanized, so that it is secured to the rubber layer 12 and the pitch thereof does not vary.
  • a conductor 20 made of the core 11, rubber layer 12 and resistance wire 13 has an outer diameter of 0.6 mm.
  • the resistive cable 10 is allowed to have an outer diameter of 5 mm or smaller even if the inner conductor layer 15 is formed around the outer circumferential surface of the conductor 20.
  • the inner conductor layer 15 having an outer diameter of 0.8 mm is formed by extruding partially conductive polyethylene (PE) obtained by mixing carbon with polyethylene. The presence of the inner conductor layer 15 brings about an improved dielectric strength.
  • the rubber layer 12 comes off due to the pressure and heat generated during this operation unless the rubber layer 12 has a sufficient strength. This leads to an inability to form the inner conductor layer 15 by means of extrusion.
  • fluororubber is used to form the rubber layer 12, the rubber layer 12 is allowed to have a coating strength required during the extrusion of the inner conductor layer 15 even if it contains as high a concentration as 300 to 500 parts by weight of ferrite powder which assures a satisfactory noise preventing performance.
  • a terminal fitting (not shown) is cramped to the conductor 20.
  • the release agent 14 is applied so that the inner conductor layer 15, resin layer 16, net 17 and sheath 18 can be easily peeled during this cramping operation.
  • the insulator layer 16 having an outer diameter of 3.8 mm or smaller is formed around the outer circumferential surface of the inner conductor layer by extruding ethylene propylene copolymer which is nonflammable and has a small dielectric constant.
  • the net 17 made of glass fibers is wound around the outer circumferential surface of the insulator layer 16 so as to increase a cramping force when the terminal (not shown) is cramped to the resistive cable 10 and to enhance a breaking strength.
  • the sheath 18 which is an outermost layer of the resistive cable 10 is formed around the outer circumferential surface of the net 17 by extruding ethylene propylene copolymer or silicone rubber.
  • the sheath 18 is formed such that the obtained resistive cable 10 has an outer diameter of 5 mm or smaller.
  • the rubber layer 12 is formed by applying the ferrite rubber coating material to the core 11
  • the conductor 20 made of the core 11, rubber layer 12 and resistance wire 13 is allowed to have a small outer diameter.
  • the partially conductive inner conductor layer 15 can be formed by means of extrusion between the conductor 20 and an outer layer 21 including the insulator layer 16, net 17 and sheath 18. This inner conductor layer 15 functions to enhance a dielectric strength against a high voltage.
  • the rubber layer 12 of the conductor 20 contains a high concentration of ferrite powder because it is formed of the mixture obtained by mixing 300 to 500 parts by weight of ferrite powder with 100 parts by weight of fluororubber. Thus, the noise preventing performance can be improved despite the thin rubber layer 12.
  • the content of ferrite powder is smaller than 300 parts by weight, the noise preventing performance is unsatisfactory because the magnetic permeability ⁇ is low. If the content of ferrite powder is larger than 500 parts by weight, the properties of the rubber layer 12 such as strength and heat resistance are reduced, thereby making it impossible to form the inner conductor layer 15 by means of extrusion.
  • a rubber layer of a conductor is formed by applying a fluororubber based coating material containing ferrite powder to a core.
  • a resistance wire is wound around the outer circumferential surface of the rubber layer in a direction normal to the axis of the core and the rubber layer contains ferrite powder three to five times as much as fluororubber in part by weight; accordingly the noise preventing performance can be enhanced.
  • the thickness of the rubber layer can be made smaller. This enables the conductor to have an outer diameter of 0.6 mm or smaller.
  • the resistive cable is allowed to have an outer diameter of 5 mm or smaller even if a partially conductive inner conductor layer for improving the dielectric strength can be formed by means of extrusion between the conductor and an outer layer including an insulator layer, a net and a sheath.
  • this inventive resistive cable has an outer diameter of 5 mm or smaller and a capacitance of 80 pF/m or smaller, the resistance value thereof does not vary upon being subjected to high voltage, thereby improving the dielectric strength characteristic, and the noise preventing performance thereof can be enhanced.
  • this resistive cable can be suitably used as an ignition cable for an automotive vehicle which requires higher voltage.

Landscapes

  • Insulated Conductors (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (14)

  1. Câble résistif à haute tension du type à bobine (10) pour la suppression du bruit, comportant
    un noyau allongé (11) de fibres renforcées,
    une couche en caoutchouc (12) d'une poudre de prévention du bruit et d'une matière en caoutchouc dur revêtant ledit noyau (11),
    un fil de résistance (13) enroulé autour de la surface circonférentielle externe de ladite couche en caoutchouc (12) dans une direction perpendiculaire à l'axe longitudinal dudit noyau allongé (11), formant ainsi un conducteur (20) avec ledit noyau (11) et ladite couche en caoutchouc (12), des moyens de couche intermédiaire (15, 16) avec une couche intérieure de conducteur (15) et une couche isolante (16), un filet (17) et une gaine (18) étant formés autour de la surface circonférentielle externe du conducteur (20) l'un au-dessus de l'autre dans cet ordre, et un lubrifiant (14) étant prévu entre le conducteur (20) et les moyens de couche intermédiaire (15, 16), de telle sorte que le câble résistif à haute tension du type à bobine (10) obtenu a un diamètre extérieur de 5 mm ou moins.
  2. Câble (10) selon la revendication 1, dans lequel la couche en caoutchouc (12) est fabriquée en appliquant une matière d'enduction de caoutchouc fluoré dur et de poudre de ferrite sur la surface circonférentielle externe du noyau (11) et dans lequel le conducteur (20) a un diamètre extérieur de 0,6 mm ou moins.
  3. Câble (10) selon la revendication 1 ou 2, dans lequel la couche isolante (16) est une couche de résine.
  4. Câble (10) selon l'une quelconque des revendications 1 à 3, dans lequel le noyau (11) a un diamètre extérieur de 0,4 à 0,45 mm obtenu en torsadant trois fibres d'aramide ou de verre renforcées d'environ 400 deniers chacune.
  5. Câble (10) selon une ou plusieurs des revendications 1 à 4, dans lequel la couche en caoutchouc (12) est constituée d'un mélange de matière d'enduction de 300 à 500 parties en poids de poudre de ferrite et de 100 parties en poids de caoutchouc fluoré.
  6. Câble (10) selon la revendication 5, dans lequel la couche en caoutchouc (12) est constituée d'un mélange de matière d'enduction de 300 à 400 parties en poids de poudre de ferrite et de 100 parties en poids de caoutchouc fluoré.
  7. Câble (10) selon la revendication 5, dans lequel la couche en caoutchouc (12) est constituée d'un mélange de matière d'enduction de 400 à 500 parties en poids de poudre de ferrite et de 100 parties en poids de caoutchouc fluoré.
  8. Câble (10) selon la revendication 5, dans lequel la couche en caoutchouc (12) est constituée d'un mélange de matière d'enduction de 400 parties en poids de poudre de ferrite et de 100 parties en poids de caoutchouc fluoré.
  9. Câble (10) selon une ou plusieurs des revendications 1 à 5, dans lequel la couche intérieure de conducteur (15) est formée par extrusion d'une résine polyoléfine partiellement conductrice.
  10. Procédé de fabrication d'un câble résistif à haute tension du type à bobine (10) pour supprimer le bruit, ledit procédé comportant les étapes consistant à :
    prévoir un noyau allongé (11) composé de fibres renforcées; appliquer une couche en caoutchouc (12) d'une poudre de prévention du bruit et d'une matière en caoutchouc dur sous forme d'un revêtement sur le noyau (11),
    enrouler un fil de résistance (13) autour de la couche en caoutchouc (12) dans une direction perpendiculaire à l'axe longitudinal du noyau (11) afin de définir un conducteur (20),
    appliquer des couches intermédiaires entourant ledit conducteur (20) avec un lubrifiant (14), une couche intérieure de conducteur (15) et une couche isolante (16), l'un au-dessus de l'autre dans cet ordre,
    appliquer un filet (17) entourant lesdites couches intermédiaires, et
    appliquer une gaine (18) entourant ledit filet (17), en revêtant la combinaison dudit conducteur (20) et desdites couches intermédiaires (14, 15, 16, 17) avec un diamètre extérieur de 5 mm ou moins.
  11. Procédé selon la revendication 10, dans lequel l'étape d'application de la couche en caoutchouc (12) sur le noyau (11) comporte le fait d'enduire le noyau (11) d'une couche en caoutchouc (12) définissant un mélange de 300 à 500 parties en poids de poudre de ferrite et de 100 parties en poids de caoutchouc fluoré.
  12. Procédé selon la revendication 10 ou 11, dans lequel l'étape d'enroulement du fil de résistance (13) comporte le fait d'enrouler le fil de résistance (13) avec un pas d'approximativement 10000 lignes par mètre.
  13. Procédé selon l'une quelconque des revendications 10 à 12, comportant en outre l'étape de vulcanisation de la couche en caoutchouc (12) après avoir enduit la couche en caoutchouc (12) sur le noyau (11) et dans lequel l'étape d'enroulement du fil de résistance (13) est effectuée avant de terminer l'étape de vulcanisation.
  14. Procédé selon l'une quelconque des revendications 10 à 13, dans lequel la couche en caoutchouc (12) est formée en immergeant le noyau (11) dans une matière d'enduction à base de caoutchouc fluoré liquide obtenue en mélangeant de la poudre de ferrite à du caoutchouc fluoré et en dissolvant ce mélange dans un solvant organique.
EP19940118130 1993-11-25 1994-11-17 Câble résistive à haute tension du type à bobine pour supprimer le bruit Expired - Lifetime EP0655750B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP29561193A JPH07153318A (ja) 1993-11-25 1993-11-25 巻線型雑音防止用高圧抵抗電線
JP295611/93 1993-11-25

Publications (3)

Publication Number Publication Date
EP0655750A2 EP0655750A2 (fr) 1995-05-31
EP0655750A3 EP0655750A3 (fr) 1995-12-13
EP0655750B1 true EP0655750B1 (fr) 1998-08-12

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Application Number Title Priority Date Filing Date
EP19940118130 Expired - Lifetime EP0655750B1 (fr) 1993-11-25 1994-11-17 Câble résistive à haute tension du type à bobine pour supprimer le bruit

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EP (1) EP0655750B1 (fr)
JP (1) JPH07153318A (fr)
DE (1) DE69412430T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3087577B2 (ja) * 1994-08-03 2000-09-11 住友電装株式会社 巻線型雑音防止高圧抵抗電線
KR101515466B1 (ko) * 2014-05-22 2015-05-04 박현우 반도전 전자기 차폐층을 갖는 내굴곡성, 내마모성, 단선 특성이 개선된 전선 또는 발열전선 및 그 제조방법
CN109712749A (zh) * 2018-12-27 2019-05-03 深圳市合丰嘉大科技有限公司 一种耐高频耐高压的柔性电缆及其制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4700171A (en) * 1986-12-04 1987-10-13 United Technologies Corporation Ignition wire
JPH01211807A (ja) * 1988-02-19 1989-08-25 Yazaki Corp 巻線型高圧抵抗電線
JPH0770249B2 (ja) * 1989-11-16 1995-07-31 矢崎総業株式会社 雑音防止用高圧抵抗電線
JPH06295622A (ja) * 1993-04-06 1994-10-21 Sumitomo Wiring Syst Ltd 巻線型雑音防止用高圧抵抗電線

Also Published As

Publication number Publication date
JPH07153318A (ja) 1995-06-16
EP0655750A2 (fr) 1995-05-31
DE69412430T2 (de) 1999-03-18
DE69412430D1 (de) 1998-09-17
EP0655750A3 (fr) 1995-12-13

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