EP0696808B1 - Winding-type noise-suppressing high-tension resistive cord - Google Patents
Winding-type noise-suppressing high-tension resistive cord Download PDFInfo
- Publication number
- EP0696808B1 EP0696808B1 EP19950111676 EP95111676A EP0696808B1 EP 0696808 B1 EP0696808 B1 EP 0696808B1 EP 19950111676 EP19950111676 EP 19950111676 EP 95111676 A EP95111676 A EP 95111676A EP 0696808 B1 EP0696808 B1 EP 0696808B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polymer
- winding
- core
- tension resistive
- type noise
- 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.)
- Expired - Lifetime
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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 material of the core 52 generally used is fluororubber and silicone rubber which are a base polymer of high heat-resistance and high strength (Japanese Utility Model Publication No. 60-28002 (1985) and Japanese Utility Model Publication No. 5-20467 (1993)).
- fluororubber and silicone rubber which are a base polymer of high heat-resistance and high strength
- EPR ethylene propylene rubber
- the EPR used as the base polymer of the core does not provide a suitable hardness when it is unvulcanized, failing to cause the resistance wire to suitably resiliently dent the surface of the core when the resistance wire is wound around the core of the unvulcanized base polymer. Further, vulcanized EPR has a low strength and low elongation, resulting in the core torn off during the removal of the insulating layer and cracks in the core when bent for connection to the terminal.
- Document EP-A-0 329 188 which is considered to represent the most relevant state of the art discloses a winding-type noise-suppressing high-voltage resistive cord comprising a core, a resistance wire coiled around the core and an insulating layer for coating said core around which the resistance wire is coiled.
- the core is formed as ferrite rubber layer comprising a base polymer, for example ethylene-propylene, which contains ferrite powder and electrically conductive particles.
- Object of the present invention is to improve a winding-type noise-suppressing high-voltage cord according to the preamble of claim 1 in such a way that tensile strength and hardness of a core of the cord and adhesion of a resistance wire on the core are increased.
- the reinforcing polymer is ethylene-vinyl acetate copolymer.
- the reinforcing polymer is polyethylene.
- the reinforcing polymer is polypropylene.
- the presence of the reinforcing polymer having the good compatibility with EPR allows the unvulcanized core to have a strength suitable to coil the resistance wire therearound.
- the vulcanization causes cross-linkage in the EPR, in the reinforcing polymer, and between the EPR and reinforcing polymer to increase the strength of the vulcanized core. Therefore, the winding-type noise-suppressing high-tension resistive cord having physical properties identical with those of the conventional cord including the core of fluororubber and silicone rubber is fabricated at low costs.
- a winding-type noise-suppressing high-tension resistive cord 10 comprises a reinforcing string 11 including three twisted 1000-denier aramid yarns, and a core 12 of a 1.3 mm outer diameter formed by extrusion-coating the reinforcing string 11 with a polymer including ferrite powder mixed therein.
- the ferrite powder preferably includes Mn-Zn based ferrite such as Mn-Zn-Fe (manganese-zinc-ferric oxide).
- the polymer is a blend of ethylene-propylene-diene terpolymer (EPDM) which is one of the EPR as a base polymer and ethylene-vinyl acetate copolymer (EVA) which is EPDM-compatible and to be covulcanized during vulcanization as a reinforcing polymer.
- EPDM ethylene-propylene-diene terpolymer
- EVA ethylene-vinyl acetate copolymer
- the core 12 contains 100 parts by weight of the blend polymer and 500 parts by weight of the ferrite powder.
- a 50 ⁇ m Ni-Cr resistance wire 13 is coiled 7200 times per meter around the core 12, with the blend polymer unvulcanized. Since the unvulcanized blend polymer has a suitable hardness, the resistance wire 13 is half embedded in the core 12 as shown in Fig. 2. The resistance wire 13 is held half embedded in the core 12 by subsequent vulcanization (under conditions of 160°C.; 30 minutes).
- An insulating layer 14 is formed by EPDM extrusion coating on the core 12 around which the resistance wire 13 is wound.
- the insulating layer 14 is coated with a reinforcing braid 15 made of glass yarn, and the reinforcing braid 15 is coated with a sheath 16 made of EPDM.
- the reinforcing polymer is not limited to EVA but may be polypropylene (PP) and polyethylene (PE), for example.
- EVA and PE are suitable.
- the blend ratio of EPDM to PE is within the range of about 80 to about 70 parts by weight of the former to, correspondingly, about 20 to about 30 parts by weight of the latter (that is, the blend polymer includes about 20 to about 30 % by weight of the PE) and the blend ratio of EPDM to EVA is within the range of about 80 to about 40 parts by weight of the former to, correspondingly, about 20 to about 60 parts by weight of the latter (that is, the blend polymer includes about 20 to about 60 % by weight of the EVA), satisfactory extrusion workability is obtained if about 100 to about 600 parts by weight of the ferrite powder is mixed, and the physical properties of the unvulcanized polymer are a hardness of 75 to 85 and an elongation of 50 % or more. This prevents the core 12 from being cracked when the resistance wire 13 is wound therearound and from being torn off.
- the obtained physical properties of the vulcanized polymer are a strength of 5 MPa or more and an elongation of 50 % or more. This prevents the core 12 from being torn off and cracked when the insulating layer 14 is stripped and the core is bent for connection between the cord and the metal terminal.
Landscapes
- Insulated Conductors (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Communication Cables (AREA)
Description
- 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. In general, 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.
- As shown in Fig. 3 is disclosed the winding-type high-tension resistive cord which comprises a reinforcing
string 51 of aramid fibers, glass fibers or the like; acore 52 formed by extrusion-coating the reinforcingstring 51 with a base polymer including ferrite powder mixed therein; aresistance wire 53 coiled around thecore 52; aninsulating layer 54 for extrusion-coating thecore 52 and theresistance wire 53; abraid 55 for coating the insulatinglayer 54; and anoutermost sheath 56 for coating the braid 55 (Japanese Utility Model Publication No. 1-32253 (1989)). - In this type of winding-type high-tension resistive cord, as shown in Fig. 4, the
insulating layer 54 is stripped and thecore 52 around which theresistance wire 53 is wound is bent along the outer surface of the cord in its longitudinal direction. Then a tubular metal terminal A is fitted on the cord, with thecore 52 with theresistance wire 53 bent, for connection between the metal terminal A and theresistance wire 53. Thus, coils of theresistance wire 53 must be prevented from coming loose when theinsulating layer 54 is stripped and from deviating to contact each other when thecore 52 is bent which might result in changes in resistance. For this reason, it has been a common practice to coil theresistance wire 53 around thecore 52, with the base polymer unvulcanized and inelastic, to embed theresistance wire 53 in thecore 52, and then to vulcanize the base polymer to hold theresistance wire 53 resiliently denting the surface of thecore 52. - In this type of winding-type high-tension resistive cord, the material of the
core 52 generally used is fluororubber and silicone rubber which are a base polymer of high heat-resistance and high strength (Japanese Utility Model Publication No. 60-28002 (1985) and Japanese Utility Model Publication No. 5-20467 (1993)). However, the use of less expensive ethylene propylene rubber (EPR) as the base polymer of the core has been desired in place of fluororubber and silicone rubber which are costly. - The EPR used as the base polymer of the core, however, does not provide a suitable hardness when it is unvulcanized, failing to cause the resistance wire to suitably resiliently dent the surface of the core when the resistance wire is wound around the core of the unvulcanized base polymer. Further, vulcanized EPR has a low strength and low elongation, resulting in the core torn off during the removal of the insulating layer and cracks in the core when bent for connection to the terminal.
- Document EP-A-0 329 188 which is considered to represent the most relevant state of the art discloses a winding-type noise-suppressing high-voltage resistive cord comprising a core, a resistance wire coiled around the core and an insulating layer for coating said core around which the resistance wire is coiled. The core is formed as ferrite rubber layer comprising a base polymer, for example ethylene-propylene, which contains ferrite powder and electrically conductive particles.
- Object of the present invention is to improve a winding-type noise-suppressing high-voltage cord according to the preamble of claim 1 in such a way that tensile strength and hardness of a core of the cord and adhesion of a resistance wire on the core are increased.
- This object is solved by the advantageous measures indicated in the charactersizing part of claim 1.
- Preferably, the reinforcing polymer is ethylene-vinyl acetate copolymer.
- Preferably, the reinforcing polymer is polyethylene.
- Preferably, the reinforcing polymer is polypropylene.
- According to the winding-type noise-suppressing high-tension resistive cord of the present invention, the presence of the reinforcing polymer having the good compatibility with EPR allows the unvulcanized core to have a strength suitable to coil the resistance wire therearound. The vulcanization causes cross-linkage in the EPR, in the reinforcing polymer, and between the EPR and reinforcing polymer to increase the strength of the vulcanized core. Therefore, the winding-type noise-suppressing high-tension resistive cord having physical properties identical with those of the conventional cord including the core of fluororubber and silicone rubber is fabricated at low costs.
- The object, 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 according to the present invention;
- Fig. 2 is a detail sectional view of a core around which a resistance wire is wound according to the preferred embodiment;
- Fig. 3 is a perspective view of the prior art; and
- Fig. 4 is a sectional view illustrating connection between the prior art cord and a metal terminal.
-
- A preferred embodiment will now be described according to the present invention with reference to the drawings. Referring to Fig. 1, a winding-type noise-suppressing high-tension
resistive cord 10 comprises a reinforcingstring 11 including three twisted 1000-denier aramid yarns, and acore 12 of a 1.3 mm outer diameter formed by extrusion-coating the reinforcingstring 11 with a polymer including ferrite powder mixed therein. - The ferrite powder preferably includes Mn-Zn based ferrite such as Mn-Zn-Fe (manganese-zinc-ferric oxide).
- The polymer is a blend of ethylene-propylene-diene terpolymer (EPDM) which is one of the EPR as a base polymer and ethylene-vinyl acetate copolymer (EVA) which is EPDM-compatible and to be covulcanized during vulcanization as a reinforcing polymer. The blend ratio of EPDM to EVA is 60 parts by weight of the former to 40 parts by weight of the latter. The
core 12 contains 100 parts by weight of the blend polymer and 500 parts by weight of the ferrite powder. - A 50 µm Ni-
Cr resistance wire 13 is coiled 7200 times per meter around thecore 12, with the blend polymer unvulcanized. Since the unvulcanized blend polymer has a suitable hardness, theresistance wire 13 is half embedded in thecore 12 as shown in Fig. 2. Theresistance wire 13 is held half embedded in thecore 12 by subsequent vulcanization (under conditions of 160°C.; 30 minutes). - An insulating
layer 14 is formed by EPDM extrusion coating on thecore 12 around which theresistance wire 13 is wound. The insulatinglayer 14 is coated with a reinforcingbraid 15 made of glass yarn, and the reinforcingbraid 15 is coated with asheath 16 made of EPDM. - The reinforcing polymer is not limited to EVA but may be polypropylene (PP) and polyethylene (PE), for example. In particular, EVA and PE are suitable.
- As shown in Table 1, when the blend ratio of EPDM to PE is within the range of about 80 to about 70 parts by weight of the former to, correspondingly, about 20 to about 30 parts by weight of the latter (that is, the blend polymer includes about 20 to about 30 % by weight of the PE) and the blend ratio of EPDM to EVA is within the range of about 80 to about 40 parts by weight of the former to, correspondingly, about 20 to about 60 parts by weight of the latter (that is, the blend polymer includes about 20 to about 60 % by weight of the EVA), satisfactory extrusion workability is obtained if about 100 to about 600 parts by weight of the ferrite powder is mixed, and the physical properties of the unvulcanized polymer are a hardness of 75 to 85 and an elongation of 50 % or more. This prevents the
core 12 from being cracked when theresistance wire 13 is wound therearound and from being torn off. - Further, in the above described blend ratio ranges, the obtained physical properties of the vulcanized polymer are a strength of 5 MPa or more and an elongation of 50 % or more. This prevents the
core 12 from being torn off and cracked when theinsulating layer 14 is stripped and the core is bent for connection between the cord and the metal terminal. - 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 numerous modifications and variations can be devised without departing from the scope of the invention.
Claims (8)
- A winding-type noise-suppressing high-tension resistive cord (10) comprising:a core (12) including a polymer and a ferrite powder mixed therein;a resistance wire (13) coiled around said core; andan insulating layer (14) for coating said core around which said resistance wire hat first been coiled; characterized in thatsaid polymer is a blend polymer being made by blending ethylene propylene rubber as a base polymer with a reinforcing polymer having a good compatibility with the ethylene propylene rubber and having been covulcanized during vulcanization, and said resistance wire is half embedded in said core with said blend polymer being in an unvulcanized state.
- The winding-type noise-suppressing high-tension resistive cord of claim 1, whereinsaid insulating layer (14) is coated with a reinforcing braid (15) and said reinforcing braid is coated with a sheath (16).
- The winding-type noise-suppressing high-tension resistive cord of claim 1 or 2, whereinsaid reinforcing polymer is ethylene-vinyl acetate copolymer.
- The winding-type noise-suppressing high-tension resistive cord of claim 3, whereinsaid blend polymer includes about 20 to about 60 % by weight of said reinforcing polymer.
- The winding-type noise-suppressing high-tension resistive cord of claim 1 or 2, whereinsaid reinforcing polymer is polyethylene.
- The winding-type noise-suppressing high-tension resistive cord of claim 5, whereinsaid blend polymer includes about 20 to about 30 % by weight of said reinforcing polymer.
- The winding-type noise-suppressing high-tension resistive cord of claim 1 or 2, whereinsaid reinforcing polymer is polypropylene.
- The winding-type noise-suppressing high-tension resistive cord of claim 4 or 6, whereinsaid ferrite powder is mixed in an amount of about 100 to about 600 parts by weight per 100 parts by weight of said blend polymer.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP186073/94 | 1994-08-08 | ||
JP6186073A JP3013710B2 (en) | 1994-08-08 | 1994-08-08 | Winding type noise prevention high voltage resistance wire |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0696808A2 EP0696808A2 (en) | 1996-02-14 |
EP0696808A3 EP0696808A3 (en) | 1996-03-27 |
EP0696808B1 true EP0696808B1 (en) | 1999-03-17 |
Family
ID=16181919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19950111676 Expired - Lifetime EP0696808B1 (en) | 1994-08-08 | 1995-07-25 | Winding-type noise-suppressing high-tension resistive cord |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0696808B1 (en) |
JP (1) | JP3013710B2 (en) |
CN (1) | CN1121632A (en) |
DE (1) | DE69508323T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108129743A (en) * | 2017-12-20 | 2018-06-08 | 苏州希普拉斯新材料有限公司 | New-energy automobile halogen-free flameproof high resiliency cable material of polyolefin |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6054028A (en) * | 1996-06-07 | 2000-04-25 | Raychem Corporation | Ignition cables |
JPH1068849A (en) * | 1996-08-29 | 1998-03-10 | Tokin Corp | Optical fiber cable |
JP4508401B2 (en) * | 2000-11-20 | 2010-07-21 | 三井化学株式会社 | Manufacturing method of alloy extrusion molded product, manufacturing apparatus and molded product |
CN102385946A (en) * | 2010-09-04 | 2012-03-21 | 深圳市沃尔核材股份有限公司 | Shielding wire and manufacturing method |
US20130133921A1 (en) * | 2011-11-28 | 2013-05-30 | Prestolite Wire Llc | Anti-capillary resistor wire |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58103415U (en) | 1981-12-31 | 1983-07-14 | 株式会社デンソー | Low capacitance wire-wound high voltage resistance wire |
JPS6028002U (en) | 1983-08-03 | 1985-02-25 | 株式会社 堀技術研究所 | vacuum holding valve |
JPH01211807A (en) * | 1988-02-19 | 1989-08-25 | Yazaki Corp | Oil wire type high voltage resistant cable |
JPH0770249B2 (en) * | 1989-11-16 | 1995-07-31 | 矢崎総業株式会社 | High voltage resistance wire for noise prevention |
JPH0520467U (en) | 1991-01-04 | 1993-03-12 | 日本電気株式会社 | Equipment |
-
1994
- 1994-08-08 JP JP6186073A patent/JP3013710B2/en not_active Expired - Lifetime
-
1995
- 1995-07-25 EP EP19950111676 patent/EP0696808B1/en not_active Expired - Lifetime
- 1995-07-25 DE DE1995608323 patent/DE69508323T2/en not_active Expired - Fee Related
- 1995-08-08 CN CN 95109297 patent/CN1121632A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108129743A (en) * | 2017-12-20 | 2018-06-08 | 苏州希普拉斯新材料有限公司 | New-energy automobile halogen-free flameproof high resiliency cable material of polyolefin |
Also Published As
Publication number | Publication date |
---|---|
EP0696808A3 (en) | 1996-03-27 |
CN1121632A (en) | 1996-05-01 |
JP3013710B2 (en) | 2000-02-28 |
JPH0850816A (en) | 1996-02-20 |
DE69508323T2 (en) | 1999-11-11 |
EP0696808A2 (en) | 1996-02-14 |
DE69508323D1 (en) | 1999-04-22 |
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