EP0644556A2 - Winding-type high-voltage resistant, resistive cord for preventing noises - Google Patents
Winding-type high-voltage resistant, resistive cord for preventing noises Download PDFInfo
- Publication number
- EP0644556A2 EP0644556A2 EP94105235A EP94105235A EP0644556A2 EP 0644556 A2 EP0644556 A2 EP 0644556A2 EP 94105235 A EP94105235 A EP 94105235A EP 94105235 A EP94105235 A EP 94105235A EP 0644556 A2 EP0644556 A2 EP 0644556A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- type high
- voltage resistant
- layer
- insulating layer
- 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.)
- Granted
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Classifications
-
- 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 winding-type high-voltage resistant, resistive cord for preventing noises which is used as an ignition cable in an internal combustion engine of an automotive vehicle or the like and, more particularly, to a winding-type high-voltage resistant, resistive cord for preventing noises which is sufficiently resistant to voltage.
- High-voltage resistant, resistive cords for transmitting a high voltage generated at an ignition coil to a spark plug directly or through a distributer are of two types: a string-type wherein fibers are impregnated with carbon; and a winding-type wherein a metal small-gage wire having a high specific resistance is wound about a core made of a magnetic material or the like. Both two types of high-voltage resistant, resistive cords are required to have reduced electric transmission losses, excellent noise prevention effects, and good resistance to heat and voltage.
- winding-type high-voltage resistant, resistive cords are disclosed in, for example, Japanese Patent Application Laid-Open No. 63-168915 (1988) and Japanese Patent Application Laid-Open No. 60-3809 (1985).
- the former as shown in Fig. 7, comprises a tension member 51 made of aramid fibers, glass fibers or the like, a core 52 formed by coating the tension member 51 with extruded fluorocarbon rubber in which a magnetic material such as ferrite powder is mixed, a resistance wire 53 wound about the core 52, an insulating layer 54 extruded and coating the core wire 52 and the resistance wire 53, a braid 55 coating the insulating layer 54, and an outermost sheath 56 coating the braid 55.
- the latter as shown in Fig. 8, comprises string-like fibers 61 formed by twisting glass fibers like the former, a core bundled layer 62 made of a synthetic resin such as silicone resin or the like and coating the string-like fibers 61, a metal resistance wire 63 such as a nichrome wire which is coiled around the core bundled layer 62, a conductive silicone rubber layer 64 extruded and coating the metal resistance wire 63, an insulating layer 65 coating the conductive silicone rubber layer 64, a braid 66 coating the insulating layer 65, and a sheath layer 67 coating the braid 66.
- a metal resistance wire 63 such as a nichrome wire which is coiled around the core bundled layer 62
- a conductive silicone rubber layer 64 extruded and coating the metal resistance wire 63
- an insulating layer 65 coating the conductive silicone rubber layer 64
- a braid 66 coating the insulating layer 65
- a sheath layer 67 coating the braid 66.
- the former can prevent the resistance wire 53 from shifting since the resistance wire 53 is buried in the surface of the core 52.
- the conductive silicone rubber layer 64 extruded and coating the metal resistance wire 63 allows the metal resistance wire 63 to have a stable resistance.
- the silicone rubber layer 64 serving as the internal layer does not cause the foregoing problem.
- the insulating layer 65 covering the silicone rubber layer 64 is made of a material such as crosslinked polyethylene (PEX), ethylene-propylene-diene copolymer (EPDM) or the like, which is different from the material of the silicone rubber layer 64. This results in poor adhesion between the insulating layer 65 and the silicone rubber layer 64 and a gap generated therebetween, which lowers the resistance to voltage due to the corona discharge.
- PEX crosslinked polyethylene
- EPDM ethylene-propylene-diene copolymer
- the present invention is intended for a winding-type high-voltage resistant, resistive cord for preventing noises.
- the resistive cord comprises: a conductor including a core and a metal small-gage wire having a high specific resistance and wound about the core; a semiconductive internal layer for coating the conductor; and an insulating layer for coating the internal layer, the core being formed by impregnating a fiber bundle with a fluorocarbon rubber coating containing a conductive material such as carbon or a magnetic material such as ferrite, the internal layer being formed of a semiconductive material containing conductive particles such as carbon made mainly of the same material as the insulating layer.
- the core is not removed from the fiber bundle by a pressure of extrusion of the hard internal layer.
- the internal layer and the insulating layer which are made mainly of the same material have good adhesion to each other and form no gap therebetween.
- the fluorocarbon rubber coating may contain either or both of the conductive material and magnetic material.
- the provision of the removal layer between the conductor and the internal layer facilitates the stripping of the coating layers including the internal layer outside the conductor during cutting and stripping operation.
- a winding-type high-voltage resistant, resistive cord for preventing noises of the preferred embodiment comprises a fiber bundle 11, a core 12, a metal small-gage wire 13, a removal layer 15, an internal layer 16, an insulating layer 17, a braid 18, and a sheath 19.
- the fiber bundle 11 is made of 2250 denier aramid fibers (DuPont-made Kevlar fibers) and is twisted (100 T/m) for flexibility.
- the fiber bundle 11 is immersed in and impregnated with a fluorocarbon rubber coating 21 formed by filling fluorocarbon rubber with carbon and ferrite and regulating it by a solvent which is methyl ethyl ketone (MEK), and is then dried in a drying furnace 22, to form the core 12 on the outer periphery of the fiber bundle 11 as shown in Fig. 2.
- a fluorocarbon rubber coating 21 formed by filling fluorocarbon rubber with carbon and ferrite and regulating it by a solvent which is methyl ethyl ketone (MEK), and is then dried in a drying furnace 22, to form the core 12 on the outer periphery of the fiber bundle 11 as shown in Fig. 2.
- MEK methyl ethyl ketone
- the metal small-gage wire 13 having a high specific resistance is wound about the core 12 formed on the outer periphery of the fiber bundle 11 by means of a horizontal winding machine 23 as shown in Fig. 3.
- the horizontal winding machine 23 includes a bobbin 23a around which a 40 ⁇ m nichrome wire serving as the metal small-gage wire 13 is wound for passing the fiber bundle 11 therethrough, a guide 23b rotating for winding the metal small-gage wire 13 onto the core 12, and a reel 23c for reeling a winding conductor 14.
- the removal layer 15 made of graphite or silicone is formed on the outer periphery of the winding conductor 14 by means of a removal layer forming machine 24 as shown in Fig. 4.
- the semiconductive, polyethylene (PE) based internal layer 16 filled with carbon and the insulating layer 17 in which a flexible PEX containing blended PEX and EP and a vulcanizing agent are mixed are sequentially made by extrusion by means of an internal layer extruding machine 25 and an insulating layer extruding machine 26.
- the insulating layer 17 which is non-vulcanized passes through a vulcanizing tube 27 to be vulcanized.
- the removal layer 15 is provided between the winding conductor 14 and the internal layer 16 for ease of stripping of coating layers including the internal layer 16 outside the winding conductor 14 during cutting and stripping operation.
- the insulating layer 17 is covered with the braid 18 made of glass fibers by means of a braiding machine 28.
- the sheath 19 made of silicone rubber in which a vulcanizing agent is mixed is extruded to coat the braid 18 by means of a sheath extruding machine 29, and is vulcanized through a vulcanizing tube 30, thereby completing the winding-type high-voltage resistant, resistive cord for preventing noises as shown in Fig. 1.
Abstract
Description
- The present invention relates to a winding-type high-voltage resistant, resistive cord for preventing noises which is used as an ignition cable in an internal combustion engine of an automotive vehicle or the like and, more particularly, to a winding-type high-voltage resistant, resistive cord for preventing noises which is sufficiently resistant to voltage.
- High-voltage resistant, resistive cords for transmitting a high voltage generated at an ignition coil to a spark plug directly or through a distributer are of two types: a string-type wherein fibers are impregnated with carbon; and a winding-type wherein a metal small-gage wire having a high specific resistance is wound about a core made of a magnetic material or the like. Both two types of high-voltage resistant, resistive cords are required to have reduced electric transmission losses, excellent noise prevention effects, and good resistance to heat and voltage.
- The winding-type high-voltage resistant, resistive cords are disclosed in, for example, Japanese Patent Application Laid-Open No. 63-168915 (1988) and Japanese Patent Application Laid-Open No. 60-3809 (1985).
- The former, as shown in Fig. 7, comprises a
tension member 51 made of aramid fibers, glass fibers or the like, acore 52 formed by coating thetension member 51 with extruded fluorocarbon rubber in which a magnetic material such as ferrite powder is mixed, aresistance wire 53 wound about thecore 52, aninsulating layer 54 extruded and coating thecore wire 52 and theresistance wire 53, abraid 55 coating theinsulating layer 54, and anoutermost sheath 56 coating thebraid 55. - The latter, as shown in Fig. 8, comprises string-like fibers 61 formed by twisting glass fibers like the former, a core bundled layer 62 made of a synthetic resin such as silicone resin or the like and coating the string-like fibers 61, a
metal resistance wire 63 such as a nichrome wire which is coiled around the core bundled layer 62, a conductivesilicone rubber layer 64 extruded and coating themetal resistance wire 63, aninsulating layer 65 coating the conductivesilicone rubber layer 64, abraid 66 coating theinsulating layer 65, and asheath layer 67 coating thebraid 66. - The former can prevent the
resistance wire 53 from shifting since theresistance wire 53 is buried in the surface of thecore 52. In the latter, the conductivesilicone rubber layer 64 extruded and coating themetal resistance wire 63 allows themetal resistance wire 63 to have a stable resistance. - For increase in gas mileage or miles per gallon for the internal combustion engine, a voltage required in an ignition system gradually increases. However, the above-mentioned high-voltage resistant, resistive cords cannot insure sufficient resistance to voltage for the reasons to be described below.
- In the high-voltage resistant, resistive cord disclosed in Japanese Patent Application Laid-Open No. 63-168915, there is provided no semiconductive internal layer between the
resistance wire 53 and theinsulating layer 54. For this reason, the unevenness of theresistance wire 53 increases the electric field strength, which generates a corona discharge in a space produced between theresistance wire 53 and theinsulating layer 54, resulting in lowering of the resistance to voltage. - In the high-voltage resistant, resistive cord disclosed in Japanese Patent Application Laid-Open No. 60-3809, the
silicone rubber layer 64 serving as the internal layer does not cause the foregoing problem. However, theinsulating layer 65 covering thesilicone rubber layer 64 is made of a material such as crosslinked polyethylene (PEX), ethylene-propylene-diene copolymer (EPDM) or the like, which is different from the material of thesilicone rubber layer 64. This results in poor adhesion between theinsulating layer 65 and thesilicone rubber layer 64 and a gap generated therebetween, which lowers the resistance to voltage due to the corona discharge. - To improve the resistance to voltage, it is considered to form by extrusion an internal layer having a hard, smooth surface and made basically of a material which has good adhesion to the insulting layer and is the same as the material of the insulating layer such as PEX, EPDM or the like. The above-mentioned high-voltage resistant, resistive cords wherein the
core 52 and the core bundled layer 62 covering the aramid fibers are made of a flexible material such as silicone resin or fluorocarbon rubber and do not permit stable extrusion of the foregoing hard internal layer, is disadvantageous in that the extrusion pressure of the internal layer causes thecore wire 52 and the core bundled layer 62 to be removed from the fiber bundle. -
- The present invention is intended for a winding-type high-voltage resistant, resistive cord for preventing noises. According to the present invention, the resistive cord comprises: a conductor including a core and a metal small-gage wire having a high specific resistance and wound about the core; a semiconductive internal layer for coating the conductor; and an insulating layer for coating the internal layer, the core being formed by impregnating a fiber bundle with a fluorocarbon rubber coating containing a conductive material such as carbon or a magnetic material such as ferrite, the internal layer being formed of a semiconductive material containing conductive particles such as carbon made mainly of the same material as the insulating layer.
- In the above-mentioned winding-type high-voltage resistant, resistive cord for preventing noises, since the fiber bundle is impregnated with the fluorocarbon rubber coating forming the core, the core is not removed from the fiber bundle by a pressure of extrusion of the hard internal layer. The internal layer and the insulating layer which are made mainly of the same material have good adhesion to each other and form no gap therebetween.
- The fluorocarbon rubber coating may contain either or both of the conductive material and magnetic material. The provision of the removal layer between the conductor and the internal layer facilitates the stripping of the coating layers including the internal layer outside the conductor during cutting and stripping operation.
- It is an object of the present invention to provide a winding-type high-voltage resistant, resistive cord for preventing noises which is sufficiently resistant to voltage if a high voltage is required.
- These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
-
- Fig. 1 is a perspective view of a preferred embodiment of the present invention;
- Figs. 2 to 6 are schematic views of fabrication processes of the preferred embodiment;
- Fig. 7 is a sectional view of a resistive cord of the prior art; and
- Fig. 8 is a perspective view of another resistive cord of the prior art.
- A preferred embodiment according to the present invention will now be described with reference to the drawings. As shown in Fig. 1, a winding-type high-voltage resistant, resistive cord for preventing noises of the preferred embodiment comprises a
fiber bundle 11, acore 12, a metal small-gage wire 13, aremoval layer 15, aninternal layer 16, aninsulating layer 17, abraid 18, and asheath 19. - The
fiber bundle 11 is made of 2250 denier aramid fibers (DuPont-made Kevlar fibers) and is twisted (100 T/m) for flexibility. Thefiber bundle 11 is immersed in and impregnated with afluorocarbon rubber coating 21 formed by filling fluorocarbon rubber with carbon and ferrite and regulating it by a solvent which is methyl ethyl ketone (MEK), and is then dried in adrying furnace 22, to form thecore 12 on the outer periphery of thefiber bundle 11 as shown in Fig. 2. - The metal small-
gage wire 13 having a high specific resistance is wound about thecore 12 formed on the outer periphery of thefiber bundle 11 by means of ahorizontal winding machine 23 as shown in Fig. 3. Thehorizontal winding machine 23 includes a bobbin 23a around which a 40 µm nichrome wire serving as the metal small-gage wire 13 is wound for passing thefiber bundle 11 therethrough, aguide 23b rotating for winding the metal small-gage wire 13 onto thecore 12, and areel 23c for reeling a windingconductor 14. - The
removal layer 15 made of graphite or silicone is formed on the outer periphery of thewinding conductor 14 by means of a removallayer forming machine 24 as shown in Fig. 4. The semiconductive, polyethylene (PE) basedinternal layer 16 filled with carbon and theinsulating layer 17 in which a flexible PEX containing blended PEX and EP and a vulcanizing agent are mixed are sequentially made by extrusion by means of an internallayer extruding machine 25 and an insulatinglayer extruding machine 26. Theinsulating layer 17 which is non-vulcanized passes through avulcanizing tube 27 to be vulcanized. Theremoval layer 15 is provided between thewinding conductor 14 and theinternal layer 16 for ease of stripping of coating layers including theinternal layer 16 outside thewinding conductor 14 during cutting and stripping operation. - Referring to Fig. 5, the
insulating layer 17 is covered with thebraid 18 made of glass fibers by means of a braidingmachine 28. As shown in Fig. 6, thesheath 19 made of silicone rubber in which a vulcanizing agent is mixed is extruded to coat thebraid 18 by means of asheath extruding machine 29, and is vulcanized through avulcanizing tube 30, thereby completing the winding-type high-voltage resistant, resistive cord for preventing noises as shown in Fig. 1. - While the invention has been shown and described in detail, the foregoing description is in all aspects illustrative and not restrictive. It is therefore understood that numberous modifications and variations can be devised without departing from the scope of the invention.
Claims (8)
- A winding-type high-voltage resistant, resistive cord for preventing noises, comprising:
a conductor including a core formed by impregnating a fiber bundle with a fluorocarbon rubber coating containing a conductive material and/or a magnetic material, and a metal small-gage wire having a high specific resistance and wound about said core;
an internal layer for coating said conductor; and
an insulating layer for coating said internal layer,
said internal layer being formed of a semiconductive material containing conductive particles made mainly of the same material as said insulating layer. - The winding-type high-voltage resistant, resistive cord for preventing noises of claim 1, wherein
there is provided a removal layer between said conductor and said internal layer. - The winding-type high-voltage resistant, resistive cord for preventing noises of claim 1 or 2, wherein
said insulating layer is coated with a braid, and said braid is coated with a sheath. - The winding-type high-voltage resistant, resistive cord for preventing noises of claim 1 or 2, wherein
said fiber bundle is formed of aramid fibers. - The winding-type high-voltage resistant, resistive cord for preventing noises of claim 1 or 2, wherein
said fluorocarbon rubber coating contains fluorocarbon rubber filled with a conductive material such as carbon and ferrite and regulated by a solvent which is methyl ethyl ketone. - The winding-type high-voltage resistant, resistive cord for preventing noises of claim 2, wherein
said removal layer is formed of graphite or silicone. - The winding-type high-voltage resistant, resistive cord for preventing noises of claim 1 or 2, wherein
said internal layer is made mainly of polyethylene. - The winding-type high-voltage resistant, resistive cord for preventing noises of claim 1 or 2, wherein
said insulating layer is formed by mixing a vulcanizing agent in flexible crosslinked polyethylene in which non-crosslinked polyethylene and crosslinked polyethylene are blended.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10516693A JPH06295622A (en) | 1993-04-06 | 1993-04-06 | Winding type high voltage resistance electric wire for preventing generation of noise |
JP105166/93 | 1993-04-06 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0644556A2 true EP0644556A2 (en) | 1995-03-22 |
EP0644556A3 EP0644556A3 (en) | 1995-06-21 |
EP0644556B1 EP0644556B1 (en) | 1997-08-06 |
Family
ID=14400106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940105235 Expired - Lifetime EP0644556B1 (en) | 1993-04-06 | 1994-04-05 | Winding-type high-voltage resistant, resistive cord for preventing noises |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0644556B1 (en) |
JP (1) | JPH06295622A (en) |
DE (1) | DE69404791T2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0655750A2 (en) * | 1993-11-25 | 1995-05-31 | Sumitomo Wiring Systems, Ltd. | Coil type high-voltage resistive cable for preventing noise |
US6054028A (en) * | 1996-06-07 | 2000-04-25 | Raychem Corporation | Ignition cables |
US6252172B1 (en) * | 1998-07-13 | 2001-06-26 | Sumitomo Wiring Systems, Ltd. | Electrical cable adapted for high-voltage applications |
EP1995850A1 (en) | 2007-05-25 | 2008-11-26 | Siemens Aktiengesellschaft | Glow protector |
US20130133921A1 (en) * | 2011-11-28 | 2013-05-30 | Prestolite Wire Llc | Anti-capillary resistor wire |
CN104700960A (en) * | 2015-02-02 | 2015-06-10 | 河北瑞光线缆有限公司 | Production process of cable for high-speed train |
CN109712749A (en) * | 2018-12-27 | 2019-05-03 | 深圳市合丰嘉大科技有限公司 | A kind of high voltage bearing flexible cable of high frequency tolerant and preparation method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108666048A (en) * | 2018-03-19 | 2018-10-16 | 南通智博电子线缆有限公司 | Automobile cable production technology |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4700171A (en) * | 1986-12-04 | 1987-10-13 | United Technologies Corporation | Ignition wire |
EP0329188A2 (en) * | 1988-02-19 | 1989-08-23 | Yazaki Corporation | Noise-suppressing high voltage cable and method of manufacturing thereof |
-
1993
- 1993-04-06 JP JP10516693A patent/JPH06295622A/en active Pending
-
1994
- 1994-04-05 EP EP19940105235 patent/EP0644556B1/en not_active Expired - Lifetime
- 1994-04-05 DE DE1994604791 patent/DE69404791T2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4700171A (en) * | 1986-12-04 | 1987-10-13 | United Technologies Corporation | Ignition wire |
EP0329188A2 (en) * | 1988-02-19 | 1989-08-23 | Yazaki Corporation | Noise-suppressing high voltage cable and method of manufacturing thereof |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0655750A2 (en) * | 1993-11-25 | 1995-05-31 | Sumitomo Wiring Systems, Ltd. | Coil type high-voltage resistive cable for preventing noise |
EP0655750A3 (en) * | 1993-11-25 | 1995-12-13 | Sumitomo Wiring Systems | Coil type high-voltage resistive cable for preventing noise. |
US6054028A (en) * | 1996-06-07 | 2000-04-25 | Raychem Corporation | Ignition cables |
US6252172B1 (en) * | 1998-07-13 | 2001-06-26 | Sumitomo Wiring Systems, Ltd. | Electrical cable adapted for high-voltage applications |
EP1995850A1 (en) | 2007-05-25 | 2008-11-26 | Siemens Aktiengesellschaft | Glow protector |
US20130133921A1 (en) * | 2011-11-28 | 2013-05-30 | Prestolite Wire Llc | Anti-capillary resistor wire |
CN104067355A (en) * | 2011-11-28 | 2014-09-24 | 普雷斯顿利特电线有限责任公司 | Anti-capillary resistor wire |
CN104700960A (en) * | 2015-02-02 | 2015-06-10 | 河北瑞光线缆有限公司 | Production process of cable for high-speed train |
CN109712749A (en) * | 2018-12-27 | 2019-05-03 | 深圳市合丰嘉大科技有限公司 | A kind of high voltage bearing flexible cable of high frequency tolerant and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
DE69404791D1 (en) | 1997-10-30 |
EP0644556A3 (en) | 1995-06-21 |
JPH06295622A (en) | 1994-10-21 |
DE69404791T2 (en) | 1998-02-05 |
EP0644556B1 (en) | 1997-08-06 |
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