JP6724096B2 - Insulated wire and multi-core cable - Google Patents

Insulated wire and multi-core cable Download PDF

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JP6724096B2
JP6724096B2 JP2018183032A JP2018183032A JP6724096B2 JP 6724096 B2 JP6724096 B2 JP 6724096B2 JP 2018183032 A JP2018183032 A JP 2018183032A JP 2018183032 A JP2018183032 A JP 2018183032A JP 6724096 B2 JP6724096 B2 JP 6724096B2
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layer
inner layer
cable
insulated
thickness
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JP2019175839A (en
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得天 黄
得天 黄
小林　正則
正則 小林
一宏 相田
一宏 相田
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Hitachi Metals Ltd
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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
    • H01B7/02—Disposition of insulation
    • H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08L27/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
    • 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
    • H01B7/08—Flat or ribbon cables
    • H01B7/0876—Flat or ribbon cables comprising twisted pairs
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

Description

本発明は、絶縁電線及び多芯ケーブルに関する。 The present invention relates to an insulated electric wire and a multi-core cable.

産業用のロボット等の電気配線に使用される多芯ケーブル（以下、ロボットケーブルということがある）は、ロボットの動きに追随して、所定の回数以上に亘って繰り返して曲げる動作（以下、「繰り返し曲げ」ともいう。）を受ける。そのため、多芯ケーブル内に収容されている絶縁電線には、その繰り返し曲げに耐える優れた耐屈曲性が要求される。また、多芯ケーブルが繰り返し曲げを受けた際には、ケーブル内に収容された複数本の絶縁電線同士が擦れ、絶縁電線の絶縁被覆表面が摩耗する虞がある。この絶縁被覆表面の摩耗は、二本の絶縁電線を対撚した対撚線をケーブル内に含むときに、対撚線同士が局部的に接触して激しく擦れるため顕著である。このように、産業用ロボットの配線に使用される絶縁電線には、耐屈曲性と絶縁被覆の耐摩耗性が要求されるため、絶縁被覆にフッ素樹脂を用いることが多い。 A multi-core cable (hereinafter sometimes referred to as a robot cable) used for electrical wiring of an industrial robot or the like follows a movement of the robot and repeatedly bends a predetermined number of times or more (hereinafter, referred to as “robot cable”). Also called "repeated bending"). Therefore, the insulated wire housed in the multi-core cable is required to have excellent bending resistance to withstand repeated bending. Further, when the multicore cable is repeatedly bent, a plurality of insulated electric wires housed in the cable may rub against each other, and the insulating coating surface of the insulated electric wire may be worn. The abrasion of the surface of the insulation coating is remarkable when the twisted pair wire in which two insulated electric wires are twisted in a pair is included in the cable, the twisted pair wires locally contact with each other and rub violently. As described above, since the insulated wire used for the wiring of the industrial robot is required to have the bending resistance and the abrasion resistance of the insulating coating, a fluorine resin is often used for the insulating coating.

一方、フッ素樹脂は引張り強さが高いため硬く、フッ素樹脂を被覆した絶縁電線は柔軟性に劣る。そこで、絶縁電線の柔軟性を改善するため、内側に柔らかい樹脂、その外側にフッ素樹脂の２層構造の被覆を設けた絶縁電線が提案されている（特許文献１、特許文献２、特許文献３参照）。 On the other hand, the fluororesin has high tensile strength and is hard, and the insulated electric wire coated with the fluororesin has poor flexibility. Therefore, in order to improve the flexibility of the insulated wire, an insulated wire in which a soft resin is provided on the inner side and a fluororesin two-layer coating is provided on the outer side has been proposed (Patent Document 1, Patent Document 2, and Patent Document 3). reference).

特許文献１に記載の絶縁電線は、導体周上に、エチレン−極性モノマー共重合体を主体とした組成物からなる第一層が被覆され、該第一層の外周に放射線架橋性フッ素樹脂からなる第二層が被覆され、上記第一層と上記第二層とが、接着処理を施されることなく接着しているとともに、上記第一層及び上記第二層がともに架橋されている構成を備えている。 The insulated wire described in Patent Document 1 is coated with a first layer composed of a composition mainly composed of an ethylene-polar monomer copolymer on the conductor periphery, and a radiation-crosslinkable fluororesin is formed on the outer periphery of the first layer. A configuration in which the second layer is covered, the first layer and the second layer are adhered without being subjected to an adhesion treatment, and the first layer and the second layer are cross-linked together. Equipped with.

特許文献２に記載の絶縁電線は、導体の周囲が少なくとも内側絶縁層とその外側の外側絶縁層の２層の絶縁層により被覆されている絶縁電線であって、前記内側絶縁層がＥＶＡ、ＥＥＡ、ＥＢＡ等のオレフィン系樹脂を含有し、前記外側絶縁層がフッ素樹脂を含有する構成を備えている。 The insulated wire described in Patent Document 2 is an insulated wire in which the periphery of the conductor is covered with at least two insulating layers of an inner insulating layer and an outer insulating layer outside thereof, and the inner insulating layer is EVA, EEA. , EBA, etc. are contained, and the outer insulating layer contains a fluororesin.

特許文献３に記載の絶縁電線は、導体周上に、アクリルゴムを含有する組成物からなる第一層が被覆され、該第一層の外周にフッ素樹脂からなる第二層が被覆され、上記第一層と上記第二層とが密着している構成を備えている。 In the insulated wire described in Patent Document 3, the conductor periphery is covered with a first layer made of a composition containing acrylic rubber, and the outer periphery of the first layer is covered with a second layer made of fluororesin. The first layer and the second layer are in close contact with each other.

特開２０１０−２８４８９５号公報JP, 2010-284895, A 特開２０１３−２２５４０５号公報JP, 2013-225405, A 特開２００９−２７２１００号公報JP, 2009-272100, A

しかしながら、上記の特許文献１から３に記載の絶縁電線は、いずれも自動車、電機・電子機器等に使用されることを想定しており、過酷な繰り返し曲げを受けるロボットケーブルに使用することは想定されていない。特に、複数本の絶縁電線をケーブルコアに含む多芯ケーブルが小さな曲げ半径で曲げられて配置される場合であっても、繰り返し曲げに耐えることが望まれる。 However, all of the insulated wires described in Patent Documents 1 to 3 are assumed to be used in automobiles, electric machines and electronic devices, and are assumed to be used in robot cables that undergo severe repeated bending. It has not been. In particular, even when a multi-core cable including a plurality of insulated electric wires in a cable core is bent and arranged with a small bending radius, it is desired to endure repeated bending.

本発明は、耐摩耗性を維持しつつ耐屈曲性及び柔軟性に優れた絶縁電線及びそれをケーブルコアに含む多芯ケーブルを提供することを目的とする。 An object of the present invention is to provide an insulated electric wire having excellent bending resistance and flexibility while maintaining abrasion resistance and a multi-core cable including the insulated electric wire in a cable core.

本発明は、上記課題を解決することを目的として、下記の［１］〜［３］の絶縁電線、及び［４］、［５］の多芯ケーブルを提供する。
The present invention provides the following insulated wires [1] to [ 3 ] and multicore cables [ 4 ] and [ 5 ] for the purpose of solving the above problems.

［１］ロボットケーブル内に収容されて使用される絶縁電線であって、複数本の素線を撚り合わせた撚り線で構成される導体の外周を被覆する内層と、前記内層の外周を被覆する外層とを備え、前記内層は、ポリ塩化ビニル（ＰＶＣ）により形成されており、前記外層は、エチレン四フッ化エチレン共重合樹脂（ＥＴＦＥ）により形成されており、前記内層の厚さは、前記外層の厚さよりも大きく、前記内層は、前記導体の最外側に配置された複数本の前記素線の間に存在する隙間に充填されることによって前記導体の最外側に配置された複数本の前記素線の外周面のそれぞれに対して密着し、前記導体の外周に充実に設けられている状態で前記外層の内周面に対して非接着に設けられている、絶縁電線。
［２］前記外層を形成する前記エチレン四フッ化エチレン共重合樹脂は、２０ｇ／１０ｍｉｎ以上の流動性（ＭＦＲ）を有する、前記［１］に記載の絶縁電線。
［３］前記外層は、前記内層の厚さの１／４以上、１／２以下の厚さを有する、前記［１］又は［２］に記載の絶縁電線。
［４］前記［１］から［３］のいずれか１つに記載の複数の絶縁電線を含むケーブルコアと、前記ケーブルコアの外周に設けられたシースと、を備え、曲げ半径を３Ｄ（Ｄ：自己径）にすることができる、多芯ケーブル。
［５］前記ケーブルコアが２本の前記絶縁電線を対撚りした対撚線を含む、前記［４］に記載の多芯ケーブル。 [1] a insulated wire to be used is accommodated in the robot cable coating and the inner layer for covering the outer periphery of the formed conductors in twisted wire by twisting the strands of the plurality of the outer periphery of the inner layer And an outer layer to be formed, the inner layer is formed of polyvinyl chloride (PVC), the outer layer is formed of ethylene tetrafluoride ethylene copolymer resin (ETFE), the thickness of the inner layer, greater than the thickness of said outer layer, said inner layer, a plurality of which are arranged on the outermost side of the conductor by Rukoto is filled in the gap existing between the plurality of the wires arranged on the outermost side of said conductor Insulated electric wire, which is in close contact with each of the outer peripheral surfaces of the element wires, and is non-adhered to the inner peripheral surface of the outer layer in a state of being fully provided on the outer peripheral surface of the conductor.
[2] The insulated wire according to [1], wherein the ethylene tetrafluoride ethylene copolymer resin forming the outer layer has a fluidity (MFR) of 20 g/10 min or more.
[3] The insulated wire according to [1] or [2], wherein the outer layer has a thickness of 1/4 or more and 1/2 or less of the thickness of the inner layer.
[4] A cable core including a plurality of insulated electric wires according to any one of [1] to [3], and a sheath provided on the outer periphery of the cable core, and having a bending radius of 3D (D : Self-diameter), multi-core cable.
[5] The multi-core cable according to [4], wherein the cable core includes a twisted pair wire formed by twisting two insulated wires.

本発明によると、耐摩耗性を維持しつつ耐屈曲性及び柔軟性に優れた絶縁電線及びそれをケーブルコアに含む多芯ケーブルを提供することができる。 According to the present invention, it is possible to provide an insulated wire having excellent bending resistance and flexibility while maintaining wear resistance, and a multi-core cable including the insulated wire in a cable core.

本発明の第１の実施の形態に係る多芯ケーブルの構造の一例を示す横断面図である。It is a cross-sectional view showing an example of the structure of the multi-core cable according to the first embodiment of the present invention. 図１に示す多芯ケーブルの絶縁電線を拡大して示す横断面図である。It is a cross-sectional view which expands and shows the insulated electric wire of the multi-core cable shown in FIG. 本発明の第２の実施の形態に係る多芯ケーブルの構造の一例を示す横断面図である。It is a cross-sectional view which shows an example of the structure of the multi-core cable which concerns on the 2nd Embodiment of this invention.

［実施の形態］
本発明の実施の形態について、図面を参照して説明する。なお、以下に説明する実施の形態は、本発明を実施する上での好適な具体例として示すものであり、技術的に好ましい種々の技術的事項を具体的に例示している部分もあるが、本発明の技術的範囲は、この具体的態様に限定されるものではない。また、各図面における各構成要素の寸法比は、必ずしも実際の絶縁電線及び多芯ケーブルの寸法比と一致するものではない。 [Embodiment]
Embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are shown as preferred specific examples for carrying out the present invention, and some parts specifically exemplify various technically preferable technical matters. The technical scope of the present invention is not limited to this specific embodiment. Moreover, the dimensional ratio of each component in each drawing does not necessarily match the dimensional ratio of an actual insulated wire and a multi-core cable.

＜第１の実施の形態＞
本発明の第１の実施の形態について、図１及び図２を参照して説明する。図１に示すように、多芯ケーブル１は、複数本の絶縁電線２を含むケーブルコア４と、このケーブルコア４の周囲に巻き付けられた押さえ巻６と、この押さえ巻６の外周に設けられたシールド層７と、このシールド層７の外周に設けられたシース８とを備える。なお、絶縁電線２の周囲の隙間には、その隙間を埋めるために、例えば、アラミド繊維、スフ糸等を含む介在物を設けてもよい。 <First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the multi-core cable 1 is provided with a cable core 4 including a plurality of insulated electric wires 2, a press winding 6 wound around the cable core 4, and an outer circumference of the press winding 6. The shield layer 7 and the sheath 8 provided on the outer circumference of the shield layer 7. In addition, in the gap around the insulated wire 2, in order to fill the gap, an inclusion including, for example, an aramid fiber or a staple fiber may be provided.

図１は、絶縁電線２の本数を４本とする例を示している。なお、絶縁電線２の本数は、４本に限定されるものではなく、１本、２本、３本又は５本以上でもよい。また、好ましくは、絶縁電線２の本数は、５０本以下である。また、ケーブルコア４は、絶縁電線２の他に、例えば同軸ケーブル等の他の電線やケーブルを含んでもよい。 FIG. 1 shows an example in which the number of insulated wires 2 is four. The number of insulated wires 2 is not limited to four and may be one, two, three, or five or more. Also, preferably, the number of insulated wires 2 is 50 or less. In addition to the insulated wire 2, the cable core 4 may include other wires or cables such as a coaxial cable.

（絶縁電線２）
図２は、図１に示す多芯ケーブル１の絶縁電線２を拡大して示す横断面図である。図１及び図２に示すように、絶縁電線２は、複数本の素線２１１を含んで構成される導体層２１（図１及び図２の破線参照）と、導体層２１の外周を被覆する絶縁体を含む絶縁被覆層２２とを備える。なお、図１及び図２の破線は、導体層２１を説明するために便宜上付したものであり、実際の多芯ケーブル１上に実体として存在する境界面を示すものではない。また、導体層２１は、導体の一例である。 (Insulated wire 2)
FIG. 2 is a cross-sectional view showing an enlarged insulated wire 2 of the multi-core cable 1 shown in FIG. As shown in FIGS. 1 and 2, the insulated wire 2 covers the conductor layer 21 including a plurality of strands 211 (see the broken line in FIGS. 1 and 2) and the outer periphery of the conductor layer 21. And an insulating coating layer 22 including an insulator. The broken lines in FIGS. 1 and 2 are added for convenience of explanation of the conductor layer 21, and do not show the boundary surface that actually exists on the actual multicore cable 1. The conductor layer 21 is an example of a conductor.

絶縁被覆層２２の厚さ（図２の「Ｌ3」参照）は、好ましくは、０．５０ｍｍ以下であり、例えば、約０．２５ｍｍとすることができる。以下の説明では、絶縁被覆層２２が０．２５ｍｍの厚さ（Ｌ3）を有する多芯ケーブル１を例に挙げて説明する。 The thickness of the insulating coating layer 22 (see “L 3 ”in FIG. 2) is preferably 0.50 mm or less, and can be about 0.25 mm, for example. In the following description, the multi-core cable 1 in which the insulating coating layer 22 has a thickness (L 3 ) of 0.25 mm will be described as an example.

〔導体層２１〕
導体層２１は、複数本の素線２１１を撚り合わせた撚り線を含んで構成される。素線２１１の本数は、図１で示す本数に特に限定されるものではないが、例えば、３０本や６０本とすることが好ましい。 [Conductor layer 21]
The conductor layer 21 is configured to include a twisted wire formed by twisting a plurality of element wires 211. The number of strands 211 is not particularly limited to the number shown in FIG. 1, but is preferably 30 or 60, for example.

各素線２１１は、細径であることが好ましい。各素線２１１の直径（図２の「ｄ」参照）は、例えば、約０．０８ｍｍとすることができる。また、素線２１１には、例えば、軟銅線を用いることができる。軟銅線には、銀めっき等のめっきが施されていてもよい。 It is preferable that each strand 211 has a small diameter. The diameter of each strand 211 (see “d” in FIG. 2) can be, for example, about 0.08 mm. Further, for the element wire 211, for example, annealed copper wire can be used. The annealed copper wire may be plated with silver or the like.

なお、素線２１１の直径ｄを０．０８ｍｍとし、本数を６０本とする場合（すなわち、２３ＡＷＧ（American Wire Gauge）の場合）、導体層２１の直径（図２の「φ」）は、約０．７２ｍｍとなる。この場合、導体層２１の縦断面積（すなわち、破線で囲む円形の面積）は、約０．３０ｍｍ2となる。 When the diameter d of the wire 211 is 0.08 mm and the number is 60 (that is, in the case of 23 AWG (American Wire Gauge)), the diameter of the conductor layer 21 (“φ” in FIG. 2) is about It becomes 0.72 mm. In this case, the vertical cross-sectional area of the conductor layer 21 (that is, the circular area surrounded by the broken line) is about 0.30 mm 2 .

〔絶縁被覆層２２〕
絶縁被覆層２２は、導体層２１の外周を被覆する内層２２１と、内層２２１の外周を被覆する外層２２３とを備える。そして、絶縁被覆層２２は、内層２２１の厚さが外層２２３の厚さよりも大きい。また、内層２２１と外層２２３との間に、内層２２１の厚さ（図２の「Ｌ1」参照）及び外層２２３の厚さ（図２の「Ｌ2」参照）に比して微小な厚さの空気層２２２を設けてもよい。詳細は後述する。 [Insulation coating layer 22]
The insulating coating layer 22 includes an inner layer 221 that covers the outer periphery of the conductor layer 21 and an outer layer 223 that covers the outer periphery of the inner layer 221. In the insulating coating layer 22, the thickness of the inner layer 221 is larger than the thickness of the outer layer 223. In addition, between the inner layer 221 and the outer layer 223, a small thickness compared to the thickness of the inner layer 221 (see "L 1 "in FIG. 2) and the thickness of the outer layer 223 (see "L 2 " in FIG. 2). An air layer 222 may be provided. Details will be described later.

（１）内層２２１
内層２２１は、絶縁電線２の柔軟性を向上させる役割を担う層である。絶縁電線２の柔軟性が向上することにより、結果的に多芯ケーブル１の柔軟性も向上する。そのため、内層２２１を形成する材料には、繰り返し曲げに対する耐性（すなわち、割れにくい）を有するやわらかい材料を用いることが好ましい。具体的には、内層２２１を形成する材料には、所定の値以下の引張強さを有する材料を用いることが好ましい。 (1) Inner layer 221
The inner layer 221 is a layer that plays a role of improving the flexibility of the insulated wire 2. As the flexibility of the insulated wire 2 is improved, the flexibility of the multicore cable 1 is also improved as a result. Therefore, as the material forming the inner layer 221, it is preferable to use a soft material having resistance to repeated bending (that is, difficult to break). Specifically, as the material forming the inner layer 221, it is preferable to use a material having a tensile strength equal to or lower than a predetermined value.

また、内層２２１を形成する材料には、例えば、薄い厚さ（例えば、約０．４ｍｍ以下の厚さ）で押出方式等の被覆成形による加工がし易い材料を用いることが好ましい。さらに、多芯ケーブル１が所定の温度（例えば、定格温度）に耐えられる耐熱性を有するために、内層２２１を形成する材料には、所定の温度以上の耐熱性を有する材料を用いることが好ましい。好ましくは、定格温度は、８０℃以上である。なお、本実施の形態では、定格温度を１０５℃とした。 Further, as the material forming the inner layer 221, it is preferable to use, for example, a material having a small thickness (for example, a thickness of about 0.4 mm or less) that can be easily processed by coating molding such as an extrusion method. Further, since the multi-core cable 1 has heat resistance capable of withstanding a predetermined temperature (for example, rated temperature), it is preferable to use a material having a heat resistance equal to or higher than a predetermined temperature as the material forming the inner layer 221. .. Preferably, the rated temperature is 80°C or higher. In this embodiment, the rated temperature is 105°C.

以上を鑑みて検討した結果、発明者らは、内層２２１を形成する材料には、ＰＶＣ（ポリ塩化ビニル）（融点約１７０℃、引張強さ３５ＭＰａ以下）が最適であるとの知見を得た。なお、ＰＶＣは、電線やケーブルの被覆材料として一般的なものを用いることができるが、２００％以上の伸び率を有するものを用いるのがより好ましい。また、ＰＶＣの引張強さは、後述する外層２２３を形成する材料の引張強さの１／２以下であることが好ましい。このようなＰＶＣであれば、繰り返し曲げに対する耐性があり内層２２１として好適である。 As a result of examination in view of the above, the inventors have found that PVC (polyvinyl chloride) (melting point of about 170° C., tensile strength of 35 MPa or less) is optimal for the material forming the inner layer 221. .. As the PVC, a general material can be used as a covering material for electric wires and cables, but it is more preferable to use a material having an elongation of 200% or more. Further, the tensile strength of PVC is preferably 1/2 or less of the tensile strength of the material forming the outer layer 223 described later. Such PVC has resistance to repeated bending and is suitable as the inner layer 221.

内層２２１は、好ましくは、絶縁被覆層２２の厚さの２／３以上の厚さを有する。具体的には、内層２２１の厚さＬ1は、好ましくは、０．４ｍｍ以内、より好ましくは、約０．１８ｍｍとすることができる。 The inner layer 221 preferably has a thickness of ⅔ or more of the thickness of the insulating coating layer 22. Specifically, the thickness L 1 of the inner layer 221 can be preferably 0.4 mm or less, more preferably about 0.18 mm.

内層２２１は、例えば、充実押出方式により、導体層２１と密着するように導体層２１の外周を被覆する。具体的には、内層２２１は、導体層２１を構成する素線２１１のうち最外側に配置された複数本の素線２１１Ａの外周面２１１Ａａとそれぞれ密着するように、導体層２１の外周を被覆する。最外側に配置された複数本の素線２１１Ａのうち、隣接する素線２１１Ａ間に存在する隙間（図２の「Ｓ」参照）は、内層２２１を形成するＰＶＣで充填されていることが好ましい。 The inner layer 221 covers the outer periphery of the conductor layer 21 so as to be in close contact with the conductor layer 21 by, for example, the solid extrusion method. Specifically, the inner layer 221 covers the outer periphery of the conductor layer 21 so as to be in close contact with the outer peripheral surfaces 211Aa of the plurality of outermost strands 211A of the strands 211 constituting the conductor layer 21. To do. Of the plurality of strands 211A arranged on the outermost side, the gap (see “S” in FIG. 2) existing between the adjacent strands 211A is preferably filled with PVC forming the inner layer 221. ..

（２）外層２２３
外層２２３は、多芯ケーブル１が所定の回数（例えば、１０００万回）以上に亘って繰り返し曲げを受けたとしても不具合が生じないようにするために、絶縁電線２の耐屈曲性及び耐摩耗性を満足させる役割を担う層である。そのため、外層２２３を形成する材料には、耐屈曲性及び耐摩耗性の高い材料を用いることが好ましい。 (2) Outer layer 223
The outer layer 223 has a bending resistance and a wear resistance of the insulated wire 2 so that the multi-core cable 1 does not have a problem even if it is repeatedly bent a predetermined number of times (for example, 10 million times) or more. It is a layer that fulfills the role of satisfying sex. Therefore, it is preferable to use a material having high bending resistance and abrasion resistance as the material forming the outer layer 223.

また、外層２２３は、後述するように、押出方式により内層２２１の外側を被覆する。そのため、外層２２３を形成する材料には、内層２２１の融点よりも大きすぎない融点を有する材料を用いることが好ましい。 The outer layer 223 covers the outer side of the inner layer 221 by an extrusion method, as described later. Therefore, it is preferable to use a material having a melting point not higher than the melting point of the inner layer 221 as the material forming the outer layer 223.

以上を鑑みて検討した結果、発明者らは、外層２２３を形成する材料には、フッ素系樹脂の一つであるＥＴＦＥ（エチレン四フッ化エチレン共重合樹脂）（融点約２７０℃、引張強さ５０ＭＰａ以上）が最適であるとの知見を得た。ＥＴＦＥであれば、絶縁電線２に要求される耐屈曲性及び耐摩耗性を満足させることができる。ＥＴＦＥは、好ましくは、１５０％以上の伸び率を有する。また、ＥＴＦＥは、好ましくは、１５０℃以上の耐熱性を有する。 As a result of examination in view of the above, as a material for forming the outer layer 223, the inventors have found that ETFE (ethylene tetrafluoride ethylene copolymer resin) (melting point about 270° C., tensile strength It was found that 50 MPa or more) is optimal. With ETFE, the flex resistance and abrasion resistance required for the insulated wire 2 can be satisfied. ETFE preferably has an elongation of 150% or more. Further, ETFE preferably has a heat resistance of 150° C. or higher.

さらに、ＥＴＦＥは、好ましくは、ＭＦＲ（Melt Flow Rate；流動性）が２０ｇ／１０ｍｉｎ以上の値を有するものを用いるのが好ましい。ここで、ＭＦＲは、対象とする材料の流れやすさを示す指標であり、１０分当たりに押し出される樹脂の量を示す。所定値以上のＭＦＲを有するＥＴＦＥを用いることによって、外層２２３を薄く加工することができるようになる（例えば、０．１ｍｍ以内）。 Furthermore, it is preferable to use ETFE having an MFR (Melt Flow Rate) of 20 g/10 min or more. Here, MFR is an index showing the flowability of the target material, and shows the amount of resin extruded per 10 minutes. By using ETFE having an MFR of a predetermined value or more, the outer layer 223 can be thinly processed (for example, within 0.1 mm).

具体的には、ＥＴＦＥには、以下の材料を用いることができる。
・ダイキン工業株式会社製「ＥＰ５０６」
・旭硝子株式会社（ＡＧＣガラス（通称社名））製「フルオンＣ−８８ＡＸＭ」 Specifically, the following materials can be used for ETFE.
・"EP506" manufactured by Daikin Industries, Ltd.
・"Fluon C-88AXM" manufactured by Asahi Glass Co., Ltd. (AGC glass (common name))

外層２２３は、好ましくは、内層２２１の厚さＬ1の１／４以上１／２以下の厚さを有する。また、外層２２３は、好ましくは、絶縁被覆層２２の厚さ（Ｌ3）の１／３以下の厚さＬ2を有する。具体的には、外層２２３の厚さＬ2は、より好ましくは、０．１ｍｍ以内、さらに好ましくは、約０．０７ｍｍとすることができる。このように、外層２２３を薄くすることによって、多芯ケーブル１の細径化を図るとともに、加工時の外層２２３の温度の上昇を抑制して加工時の内層２２１の劣化を抑制することができる。 The outer layer 223 preferably has a thickness of 1/4 or more and 1/2 or less of the thickness L 1 of the inner layer 221. The outer layer 223 preferably has a thickness L 2 that is ⅓ or less of the thickness (L 3 ) of the insulating coating layer 22. Specifically, the thickness L 2 of the outer layer 223 can be more preferably 0.1 mm or less, and further preferably about 0.07 mm. As described above, by thinning the outer layer 223, the diameter of the multi-core cable 1 can be reduced, and the temperature rise of the outer layer 223 during processing can be suppressed to prevent the deterioration of the inner layer 221 during processing. ..

外層２２３は、例えば、チューブ押出方式により、内層２２１の外周を被覆する。なお、内層２２１の外周面と外層２２３の内周面とは、密着していないことが好ましい。すなわち、外層２２３は、内層２２１に対して非接着に設けられていることが好ましい。換言すれば、内層２２１と外層２２３との間には、各層の厚さと比較して微小な厚さを有する空気層２２２が含まれていることが好ましい。 The outer layer 223 covers the outer periphery of the inner layer 221 by, for example, a tube extrusion method. The outer peripheral surface of the inner layer 221 and the inner peripheral surface of the outer layer 223 are preferably not in close contact with each other. That is, the outer layer 223 is preferably provided so as not to adhere to the inner layer 221. In other words, it is preferable that the air layer 222 having a minute thickness as compared with the thickness of each layer is included between the inner layer 221 and the outer layer 223.

（その他の構成）
押さえ巻６は、例えば、ポリエステル等を含む樹脂テープを用いる。押さえ巻６は、和紙でもよい。シールド層７は、例えば、導線を編組して形成される。なお、シールド層７は、導体付きテープを巻き付けたものでもよい。 (Other configurations)
For the press roll 6, for example, a resin tape containing polyester or the like is used. The press roll 6 may be Japanese paper. The shield layer 7 is formed by braiding conductive wires, for example. The shield layer 7 may be wound with a tape with a conductor.

シース８は、特に限定はされないが、例えば、ＰＶＣ、ＰＥ（ポリエチレン）、ＦＥＰ（四フッ化エチレン・六フッ化プロピレン共重合樹脂）等の材料を用いて形成される。また、シース８は、単層で構成してもよく、また、多層で構成してもよい。 The sheath 8 is not particularly limited, but is formed of a material such as PVC, PE (polyethylene), FEP (tetrafluoroethylene/hexafluoropropylene copolymer resin), for example. The sheath 8 may be composed of a single layer or multiple layers.

（第１の実施の形態の作用及び効果）
本発明の実施の形態によれば、導体層２１と密着するように導体層２１の外周を被覆するポリ塩化ビニル（ＰＶＣ）により形成された内層２２１と、エチレン四フッ化エチレン共重合樹脂（ＥＴＦＥ）により形成された内層２２１の外周を被覆する外層２２３とを備え、ポリ塩化ビニル（ＰＶＣ）からなる内層２２１の厚さがエチレン四フッ化エチレン共重合樹脂（ＥＴＦＥ）からなる外層２２３の厚さよりも大きいことにより、耐摩耗性を維持しつつ耐屈曲性及び柔軟性に優れた絶縁電線及びそれをケーブルコアに含む多芯ケーブルを提供することができる。 (Operation and effect of the first embodiment)
According to the embodiment of the present invention, the inner layer 221 formed of polyvinyl chloride (PVC) covering the outer periphery of the conductor layer 21 so as to be in close contact with the conductor layer 21, and the ethylene tetrafluoride ethylene copolymer resin (ETFE). And an outer layer 223 that covers the outer circumference of the inner layer 221 formed by the above), the thickness of the inner layer 221 made of polyvinyl chloride (PVC) is smaller than that of the outer layer 223 made of ethylene tetrafluoride ethylene copolymer resin (ETFE). Since it is also large, it is possible to provide an insulated electric wire excellent in bending resistance and flexibility while maintaining abrasion resistance and a multi-core cable including the same in a cable core.

具体的には、内層２２１を柔らかい材料であるポリ塩化ビニル（ＰＶＣ）で外層２２３の厚さよりも大きく形成することにより多芯ケーブル１の柔軟性を向上させるとともに、外層２２３を耐屈曲性及び耐摩耗性の高い材料であるエチレン四フッ化エチレン共重合樹脂（ＥＴＦＥ）で内層２２１の厚さよりも小さく形成することによって、絶縁電線２の耐摩耗性を満足させることができる。また、外層２２３を内層２２１と非接触で設けることにより、内層２２１と外層２２３との間に生じる微小な隙間によって、内層２２１が曲がりやすくなるためさらに耐屈曲性を満足させることができる。なお、このような絶縁電線２をケーブルコアに含む多芯ケーブル１は、柔軟性が向上する。柔軟性が向上した一例として、発明者らは、本発明の実施の形態に係る多芯ケーブル１により、曲げ半径を約６Ｄから約３Ｄに小さくすることができたことを確認した。なお、Ｄは、多芯ケーブル１の自己径を示す。 Specifically, the inner layer 221 is made of polyvinyl chloride (PVC), which is a soft material, and has a thickness larger than that of the outer layer 223 to improve the flexibility of the multi-core cable 1, and the outer layer 223 to be flexible and resistant. By forming the inner layer 221 with a thickness less than the thickness of the inner layer 221, it is possible to satisfy the wear resistance of the insulated wire 2 by using ethylene tetrafluoride ethylene copolymer resin (ETFE) which is a material having high wear resistance. Further, by providing the outer layer 223 in a non-contact manner with the inner layer 221, the inner layer 221 can be easily bent due to a minute gap generated between the inner layer 221 and the outer layer 223, so that the bending resistance can be further satisfied. The multicore cable 1 including such an insulated wire 2 in the cable core has improved flexibility. As one example of improved flexibility, the inventors have confirmed that the multi-core cable 1 according to the embodiment of the present invention can reduce the bending radius from about 6D to about 3D. In addition, D shows the self-diameter of the multi-core cable 1.

このように多芯ケーブル１の柔軟性が向上する（すなわち、曲げ半径を小さくできる）ことで、例えば、可動ケーブルベア（登録商標）（不図示）内に多芯ケーブル１を配置したときに、シース８と走行するケーブルベア（登録商標）の内壁との衝突や擦れを低減（すなわちシース８の損傷や粉塵の発生を抑制）することができる。すなわち、複数本の絶縁電線２をケーブルコアに含む多芯ケーブル１が小さな曲げ半径で曲げられて配置される場合であっても、繰り返し曲げに耐えることができる。 Since the flexibility of the multi-core cable 1 is improved (that is, the bending radius can be reduced), for example, when the multi-core cable 1 is arranged in a movable cable bear (registered trademark) (not shown), It is possible to reduce collision and rubbing between the sheath 8 and the inner wall of the traveling cable bear (registered trademark) (that is, to suppress damage to the sheath 8 and generation of dust). That is, even when the multi-core cable 1 including a plurality of insulated wires 2 in the cable core is bent and arranged with a small bending radius, it can withstand repeated bending.

上記の実施の形態では、絶縁電線２の本数を４本としたが、これに限定されるものではない。なお、本発明は、絶縁電線２の本数が多いほどメリットがある。 Although the number of the insulated wires 2 is four in the above embodiment, the number is not limited to this. The present invention is more advantageous as the number of insulated wires 2 increases.

＜第２の実施の形態＞
次に、本発明の第２の実施の形態について図３を参照して説明する。図３は、本発明の第２の実施の形態に係る多芯ケーブル１の構造の一例を示す横断面図である。第２の実施の形態に係る多芯ケーブル１は、一対（２本）の絶縁電線２を撚り合わせた対撚線２０を備える点で、第１の実施の形態に係る多芯ケーブル１と相違する。以下、第１の実施の形態と同一の構成要素については、同一の符号を付して重複した説明を省略するとともに、第１の実施の形態と異なる点を中心に説明する。 <Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view showing an example of the structure of the multi-core cable 1 according to the second embodiment of the present invention. The multi-core cable 1 according to the second embodiment is different from the multi-core cable 1 according to the first embodiment in that it includes a twisted pair wire 20 in which a pair (two) of insulated wires 2 are twisted together. To do. Hereinafter, the same components as those in the first embodiment will be designated by the same reference numerals, duplicate description will be omitted, and differences from the first embodiment will be mainly described.

図３に示すように、ケーブルコア４は、２本の絶縁電線２を一対として互いに撚り合わせて構成した対撚線２０を３本含んで構成されている。なお、対撚線２０の本数は、３本に限定されるものではなく、１本、２本、又は４本以上でもよく、目的に応じて適宜調整することができる。好ましくは、対撚線２０の数は、２５本以下である。 As shown in FIG. 3, the cable core 4 is configured to include three twisted pair wires 20 configured by twisting two insulated wires 2 as a pair. The number of twisted pair wires 20 is not limited to three, and may be one, two, or four or more, and can be appropriately adjusted according to the purpose. Preferably, the number of twisted pair wires 20 is 25 or less.

また、絶縁電線２の構成は、上述した第１の実施の形態に係る絶縁電線２と同様の構成を有する。詳細の説明は省略する。なお、図３では、導体層２１として７本の素線２１１を撚り合わせた構成を例に挙げたが、撚り線としての素線２１１の数は、７本に限定されるものではなく、例えば、１９本、３７本等でもよい。 The insulated wire 2 has the same configuration as the insulated wire 2 according to the first embodiment described above. Detailed description is omitted. Note that, in FIG. 3, the configuration in which seven strands 211 are twisted as the conductor layer 21 is taken as an example, but the number of strands 211 as twisted strands is not limited to seven. , 19 or 37 may be used.

対撚線２０を複数本含むとき、多芯ケーブル１が屈曲すると、撚っていない場合と比較して、隣接する対撚線２０同士が互いに擦れ合い摩耗する虞が大きい。また、対撚線２０と他の絶縁電線２とが互いに擦れ合い摩耗する場合も同様である。そのため、摩耗しにくいＥＴＦＥを絶縁電線２の表面に被覆する。 When the multi-core cable 1 is bent when a plurality of twisted pair wires 20 are included, the paired twisted wires 20 adjacent to each other are more likely to be rubbed against each other and worn as compared with the case where the twisted pair wires 20 are not twisted. The same applies to the case where the twisted pair wire 20 and the other insulated electric wire 2 rub against each other and wear. Therefore, the surface of the insulated wire 2 is coated with ETFE which is hard to wear.

（第２の実施の形態の作用及び効果）
以上、第２の実施の形態においても、第１の実施の形態と同様に、耐摩耗性を維持しつつ耐屈曲性及び柔軟性に優れた絶縁電線及びそれをケーブルコアに含む多芯ケーブルを提供することができる。また、摩耗しにくいＥＴＦＥを絶縁電線２の表面に被覆することによって、多芯ケーブル１が屈曲する際に対撚線２０同士の擦り合いや対撚線２０と絶縁電線２との擦り合いが生じる場合であっても、繰り返し曲げによって絶縁電線２が摩耗することを抑制することができる。 (Operation and effect of the second embodiment)
As described above, also in the second embodiment, similarly to the first embodiment, an insulated electric wire excellent in bending resistance and flexibility while maintaining abrasion resistance and a multicore cable including the same in a cable core are provided. Can be provided. Further, by coating the surface of the insulated wire 2 with ETFE which is less likely to wear, when the multi-core cable 1 bends, rubbing between the twisted pair wires 20 or rubbing between the twisted pair wire 20 and the insulated wire 2 occurs. Even in this case, it is possible to prevent the insulated electric wire 2 from being worn by repeated bending.

以上、本発明の実施の形態を説明したが、上記に記載した実施の形態は特許請求の範囲に係る発明を限定するものではない。また、実施の形態の中で説明した特徴の組合せの全てが発明の課題を解決するための手段に必須であるとは限らない点に留意すべきである。 Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. Further, it should be noted that not all combinations of the features described in the embodiments are essential to the means for solving the problems of the invention.

１：多芯ケーブル、２：絶縁電線、４：ケーブルコア、６：押さえ巻、７：シールド層、８：シース、２０：対撚線、２１：導体層、２２：絶縁被覆層、２１１，２１１Ａ：素線、２１１Ａａ：素線の外周面、２２１：内層、２２２：空気層、２２３：外層 1: multi-core cable, 2: insulated wire, 4: cable core, 6: press winding, 7: shield layer, 8: sheath, 20: twisted wire, 21: conductor layer, 22: insulating coating layer, 211, 211A : Strand, 211Aa: outer peripheral surface of strand, 221: inner layer, 222: air layer, 223: outer layer

Claims (5)

ロボットケーブル内に収容されて使用される絶縁電線であって、
複数本の素線を撚り合わせた撚り線で構成される導体の外周を被覆する内層と、前記内層の外周を被覆する外層とを備え、
前記内層は、ポリ塩化ビニル（ＰＶＣ）により形成されており、
前記外層は、エチレン四フッ化エチレン共重合樹脂（ＥＴＦＥ）により形成されており、
前記内層の厚さは、前記外層の厚さよりも大きく、
前記内層は、前記導体の最外側に配置された複数本の前記素線の間に存在する隙間に充填されることによって前記導体の外周に充実に設けられ、前記導体の最外側に配置された複数本の前記素線の外周面のそれぞれに対して密着しており、
前記内層と前記外層との間に空気層が形成されている、
絶縁電線。 An insulated wire that is housed and used in a robot cable,
An inner layer covering the outer circumference of a conductor formed of a twisted wire formed by twisting a plurality of strands, and an outer layer covering the outer circumference of the inner layer,
The inner layer is made of polyvinyl chloride (PVC),
The outer layer is formed of ethylene tetrafluoride ethylene copolymer resin (ETFE),
The thickness of the inner layer is greater than the thickness of the outer layer,
The inner layer is fully provided on the outer circumference of the conductor by filling a gap existing between the plurality of strands arranged on the outermost side of the conductor, and is arranged on the outermost side of the conductor. It is in close contact with each of the outer peripheral surfaces of the plurality of strands ,
An air layer is formed between the inner layer and the outer layer,
Insulated wire. 前記外層を形成する前記エチレン四フッ化エチレン共重合樹脂は、２０ｇ／１０ｍｉｎ以上の流動性（ＭＦＲ）を有する、
請求項１に記載の絶縁電線。 The ethylene tetrafluoride ethylene copolymer resin forming the outer layer has a fluidity (MFR) of 20 g/10 min or more,
The insulated electric wire according to claim 1. 前記外層は、前記内層の厚さの１／４以上、１／２以下の厚さを有する、
請求項１又は２に記載の絶縁電線。 The outer layer has a thickness of 1/4 or more and 1/2 or less of the thickness of the inner layer,
The insulated electric wire according to claim 1. 請求項１から３のいずれか１項に記載の複数の絶縁電線を含むケーブルコアと、
前記ケーブルコアの外周に設けられたシースと、
を備え、
曲げ半径を３Ｄ（Ｄ：自己径）にすることができる、多芯ケーブル。 A cable core including a plurality of insulated electric wires according to any one of claims 1 to 3,
A sheath provided on the outer periphery of the cable core,
Equipped with
A multi-core cable with a bend radius of 3D (D: self-diameter). 前記ケーブルコアが２本の前記絶縁電線を対撚りした対撚線を含む、
請求項４に記載の多芯ケーブル。 The cable core includes a pair of twisted wires formed by twisting two of the insulated wires.
The multi-core cable according to claim 4.
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