EP0696033A2 - Geräuschunterdrückender hochspannungsfester Kabel mit gewundener Widerstand - Google Patents

Geräuschunterdrückender hochspannungsfester Kabel mit gewundener Widerstand Download PDF

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Publication number
EP0696033A2
EP0696033A2 EP95111622A EP95111622A EP0696033A2 EP 0696033 A2 EP0696033 A2 EP 0696033A2 EP 95111622 A EP95111622 A EP 95111622A EP 95111622 A EP95111622 A EP 95111622A EP 0696033 A2 EP0696033 A2 EP 0696033A2
Authority
EP
European Patent Office
Prior art keywords
coating
winding
core
layer
tension resistive
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
Application number
EP95111622A
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English (en)
French (fr)
Other versions
EP0696033A3 (de
EP0696033B1 (de
Inventor
Terutsugu C/O Sumitomo Wiring Sys. Ltd. Fujimoto
Higashikozono C/O Sumitomo Wir. Sys. Ltd. Makoto
Hiroshi C/O Sumitomo Wiring Sys. Ltd. Inoue
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.)
Sumitomo Wiring Systems Ltd
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Sumitomo Wiring Systems Ltd
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Filing date
Publication date
Application filed by Sumitomo Wiring Systems Ltd filed Critical Sumitomo Wiring Systems Ltd
Publication of EP0696033A2 publication Critical patent/EP0696033A2/de
Publication of EP0696033A3 publication Critical patent/EP0696033A3/de
Application granted granted Critical
Publication of EP0696033B1 publication Critical patent/EP0696033B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 noise-suppressing high-tension resistive cord to be used as an ignition cable for an internal combustion engine of an automotive vehicle and the like.
  • High-tension resistive cords for transmitting a high voltage generated at an ignition coil to a spark plug directly or through a distributer have been required to have a low electric transmission loss, a good noise suppressing effect, and high resistance to heat and voltage.
  • currently used high-tension resistive cords are of two types: a string-type high-tension resistive cord which includes fibers impregnated with carbon; and a winding-type high-tension resistive cord which includes a metal small-gage wire having a high specific resistance and wound about a core made of a magnetic material or the like.
  • the winding-type high-tension resistive cord which comprises a reinforcing string 51 of aramid fibers, glass fibers or the like; a core 52 formed by extrusion-coating the reinforcing string 51 with a base polymer including ferrite powder mixed therein; a resistance wire 53 coiled around the core 52; an insulating layer 54 for extrusion-coating the core 52 and the resistance wire 53; a braid 55 for coating the insulating layer 54; and an outermost sheath 56 for coating the braid 55 (Japanese Utility Model Publication No. 1-32253 (1989)).
  • the above described winding-type high-tension resistive cord wherein the resistance wire coiled around the core is loosened or unwound when the insulating layer is cut and stripped, requires a purpose-built cutting and stripping machine, and it is hence impractical to put the winding-type high-tension resistive cords alone on the market.
  • the resistance wire is required to resiliently dent the surface of the core when it is coiled around the core (Japanese Patent Publication No. 5-42084 (1993)).
  • the winding-type high-tension resistive cord When the winding-type high-tension resistive cord is used as an ignition cable for an automotive vehicle, conductive materials such as salt and sludge deposited on the outer periphery of the cable increase the electrostatic capacity of the cord to reduce voltage supplied to a spark plug. Thus a need arises to reduce the electrostatic capacity of the cord itself.
  • the reduction in diameter of the conductor (the core around which the resistance wire is coiled) in the above described winding-type high-tension resistive cord increases a field strength, and an uneven conductor surface formed by winding the resistance wire around the core causes a dielectric breakdown, resulting in lowered withstand voltage.
  • a conductor portion (the core 52 and the resistance wire 53) exposed by stripping the insulating layer is bent along the outer surface of the cord in its longitudinal direction, and a tubular metal terminal A is fitted on the cord, with the conductor portion bent.
  • the reduction in conductor diameter decreases a contact area between the conductor portion and the metal terminal A, resulting in unstable electrical connection.
  • the core made of inexpensive ethylene propylene rubber (EP rubber) for reduction in fabrication cost of the cord presents a problem. That is, since the EP rubber is not heat-resistant, the core subjected to heat deterioration is softened to cause the resistance wire to be embedded more deeply than necessary in the core. This produces a clearance between the resistance wire and the metal terminal to establish unstable electrical connection.
  • EP rubber ethylene propylene rubber
  • a winding-type noise-suppressing high-tension resistive cord comprises: a core; a resistance wire coiled around the core; an internal semi-conductive layer having a flat surface and made of semi-conductive fluororubber for extrusion-coating the core around which the resistance wire is coiled; a release layer for coating the internal semi-conductive layer; and an insulating layer for coating the release layer.
  • the release layer is formed of graphite-containing silicone oil.
  • the core includes a reinforcing string of aramid fiber, and a coating layer composed mainly of rubber for coating the reinforcing string.
  • the presence of the release layer facilitates the stripping of the insulating layer, and the presence of the internal semi-conductive layer made of the semi-conductive fluororubber prevents the direct application of the force acting to strip the insulating layer to the resistance wire, thereby preventing the resistance wire from being loosened or unwound when the resistance wire is not caused to resiliently dent the surface of the core.
  • the flat surface of the internal semi-conductive layer alleviates the increase in field strength to prevent remarkable deterioration of the withstand voltage characteristic if the conductor diameter is reduced. Electrical connection between the metal terminal and the resistance wire through the internal semi-conductive layer does not decrease the contact area between the terminal and the conductor if the conductor diameter is reduced.
  • the core made of an inexpensive material which is not heat-resistant is subjected to heat deterioration to cause the resistance wire to be fully embedded in the core, the presence of the internal semi-conductive layer does not produce a clearance between the metal terminal and the resistance wire. This provides stable electrical connection.
  • a winding-type noise-suppressing high-tension resistive cord 10 comprises a semi-conductive core 11 of a 1.3 mm outer diameter including a reinforcing string 12a of three twisted 1000-denier aramid yams and a coating layer 12b made of fluororubber including ferrite powder mixed therein for extrusion-coating the reinforcing string 12a.
  • a 50 ⁇ m Ni-Cr resistance wire 13 is coiled 7200 times per meter around the core 11.
  • the coating layer 12b includes 100 parts by weight of the fluororubber and 400 parts by weight of the ferrite powder.
  • the core 11 around which the resistance wire 13 is coiled is extrusion-coated with semi-conductive fluororubber having an electrical conductivity of about 1000 to 10000 ⁇ cm which forms an internal semi-conductive layer 14 of a 1.5 mm outer diameter and having a flat surface.
  • a release layer 15 of graphite-containing silicone oil On the internal semi-conductive layer 14 is formed a release layer 15 of graphite-containing silicone oil. On the release layer 15 is formed an insulating layer 16 of a 4.6 mm outer diameter by extrusion coating of ethylene propylene rubber. The insulating layer 16 is coated with a reinforcing braid 17 of glass yarn which in turn is coated with a sheath 18 made of ethylene propylene rubber.
  • the presence of the release layer 15 facilitates the stripping of the insulating layer 16, and the presence of the internal semi-conductive layer 14 prevents the direct application of a force acting to strip the insulating layer 16 to the resistance wire 13 to prevent the resistance wire 13 from being loosened or unwound during the stripping of the insulating layer 16 if the resistance wire 13 coiled around the core 11 is not, in particular, caused to resiliently dent the surface of the core 11.
  • the presence of the flat-surface internal semi-conductive layer 14 through which the connection is made between the resistance wire 13 and a metal terminal A as shown in Fig. 2 alleviates the increase in field strength to prevent reduction in withstand voltage characteristic and extreme decrease in contact area between the metal terminal A and the conductor portion. This provides stable electrical connection between the resistance wire 13 and the metal terminal A.
  • FIG. 3 illustrates a second preferred embodiment according to the present invention.
  • a winding-type noise-suppressing high-tension resistive cord 20 according to the second preferred embodiment comprises a core 21 including a reinforcing string 22a and a coating layer 22b, a resistance wire 23, an internal semi-conductive layer 24, a release layer 25, an insulating layer 26, a reinforcing braid 27, and a sheath 28, similar to the first preferred embodiment.
  • the winding-type noise-suppressing high-tension resistive cord 20 of the second preferred embodiment differs from that of the first preferred embodiment in material and outer diameter of some of the constituents.
  • the coating layer 22b includes 500 parts by weight of ferrite powder and 100 parts by weight of EP rubber, and has an outer diameter of 1.1 mm.
  • the resistance wire 23 is a Ni-Cr resistance wire having an outer diameter of 40 ⁇ m and coiled 6000 times per meter around the core 21.
  • the internal semi-conductive layer 24 is made of semi-conductive fluororubber, similar to that of the first preferred embodiment, but has an outer diameter of 1.3 mm. Other constructions of the second preferred embodiment are identical with those of the first preferred embodiment.
  • the winding-type noise-suppressing high-tension resistive cord 20 employs EP rubber which is inexpensive but not heat-resistant as a base polymer of the coating layer 22b.
  • EP rubber which is inexpensive but not heat-resistant as a base polymer of the coating layer 22b.
  • FIG. 4 illustrates a third preferred embodiment according to the present invention.
  • a winding-type noise-suppressing high-tension resistive cord 30 comprises a core 31 including a reinforcing string 32a and a coating layer 32b, a resistance wire 33, an internal semi-conductive layer 34, a release layer 35, an insulating layer 36, a reinforcing braid 37, and a sheath 38, similar to the first and second preferred embodiments.
  • the winding-type noise-suppressing high-tension resistive cord 30 of the third preferred embodiment differs from those of the first and second preferred embodiments in material and outer diameter of some of the constituents.
  • the reinforcing string 32a includes three twisted 400-denier aramid yarns.
  • the coating layer 32b is formed of a fluororubber coating applied over the reinforcing string 32a and has an outer diameter of 0.6 mm.
  • the resistance wire 33 is a Ni-Cr resistance wire having an outer diameter of 40 ⁇ m, similar to that of the second preferred embodiment, but coiled 10000 times per meter around the core 31.
  • the internal semi-conductive layer 34 is made of semi-conductive fluororubber, similar to those of the first and second preferred embodiments, but has an outer diameter of 0.8 mm.
  • Other constructions of the third preferred embodiment are identical with those of the first and second preferred embodiments.
  • the resistance wire 33 is not permitted to resiliently dent the surface of the core 31 when it is coiled since the coating layer 32b is made of the fluororubber coating applied over the reinforcing string 32a as above described.
  • the presence of the internal semi-conductive layer 34 which covers the resistance wire 33 and the core 31 prevents the direct application of a force acting to strip the insulating layer 36 to the resistance wire 33, thereby preventing the resistance wire 33 from being loosened or unwound.

Landscapes

  • Insulated Conductors (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP19950111622 1994-08-03 1995-07-24 Geräuschunterdrückender hochspannungsfester Kabel mit gewundener Widerstand Expired - Lifetime EP0696033B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18255994A JP3087577B2 (ja) 1994-08-03 1994-08-03 巻線型雑音防止高圧抵抗電線
JP182559/94 1994-08-03

Publications (3)

Publication Number Publication Date
EP0696033A2 true EP0696033A2 (de) 1996-02-07
EP0696033A3 EP0696033A3 (de) 1996-04-03
EP0696033B1 EP0696033B1 (de) 1997-10-15

Family

ID=16120396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950111622 Expired - Lifetime EP0696033B1 (de) 1994-08-03 1995-07-24 Geräuschunterdrückender hochspannungsfester Kabel mit gewundener Widerstand

Country Status (4)

Country Link
EP (1) EP0696033B1 (de)
JP (1) JP3087577B2 (de)
CN (1) CN1122510A (de)
DE (1) DE69500877T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6917272B2 (en) * 2000-08-29 2005-07-12 Abb Ab Electric device
CN100442397C (zh) * 2006-10-20 2008-12-10 辽宁金环电缆厂 防静电耐油特种测量电缆

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102184756A (zh) * 2011-03-25 2011-09-14 天津市津特线缆有限责任公司 抑制噪声耐高压线圈型电缆
US20130133921A1 (en) * 2011-11-28 2013-05-30 Prestolite Wire Llc Anti-capillary resistor wire
CN104123986A (zh) * 2014-06-29 2014-10-29 庄健峰 一种阻燃易回收电缆
CN110580983A (zh) * 2019-09-25 2019-12-17 广东日丰电缆股份有限公司 5g低损耗的同轴电缆

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6432253A (en) 1987-07-28 1989-02-02 Fuji Photo Film Co Ltd Production of photographic silver halide emulsion
JPH0542084A (ja) 1991-08-19 1993-02-23 Mitsubishi Electric Home Appliance Co Ltd 電気掃除機

Family Cites Families (3)

* 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
JPH07153318A (ja) * 1993-11-25 1995-06-16 Sumitomo Wiring Syst Ltd 巻線型雑音防止用高圧抵抗電線

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6432253A (en) 1987-07-28 1989-02-02 Fuji Photo Film Co Ltd Production of photographic silver halide emulsion
JPH0542084A (ja) 1991-08-19 1993-02-23 Mitsubishi Electric Home Appliance Co Ltd 電気掃除機

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6917272B2 (en) * 2000-08-29 2005-07-12 Abb Ab Electric device
CN100442397C (zh) * 2006-10-20 2008-12-10 辽宁金环电缆厂 防静电耐油特种测量电缆

Also Published As

Publication number Publication date
DE69500877T2 (de) 1998-05-20
DE69500877D1 (de) 1997-11-20
EP0696033A3 (de) 1996-04-03
EP0696033B1 (de) 1997-10-15
JPH0845354A (ja) 1996-02-16
JP3087577B2 (ja) 2000-09-11
CN1122510A (zh) 1996-05-15

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