JP2020119857A

JP2020119857A - Conductor and power supply cable

Info

Publication number: JP2020119857A
Application number: JP2019012275A
Authority: JP
Inventors: 康二向井; Koji Mukai; 祐作平井; Yusaku Hirai
Original assignee: Yoshinogawa Electric Wire and Cable Co Ltd
Current assignee: Yoshinogawa Electric Wire and Cable Co Ltd
Priority date: 2019-01-28
Filing date: 2019-01-28
Publication date: 2020-08-06
Anticipated expiration: 2039-01-28
Also published as: JP7010249B2

Abstract

To provide a conductor having high torsion resistance, and a power supply cable using the conductor.SOLUTION: Concerning a conductor in which a plurality of twisted conductors are changed into a parent-twisted conductor by a more twisted structure, in a constitution of a cut surface formed by cutting the conductor in a direction orthogonal to a length direction, a gap is formed on the center of the plurality of twisted conductors, and a replenishment member is twisted between a twisted conductor and a twisted conductor respectively.SELECTED DRAWING: Figure 2

Description

本発明は、導体、および該導体を用いた電源ケーブルに関する。 The present invention relates to a conductor and a power cable using the conductor.

従来より、ケーブルに用いられる導体として、撚り導体が知られている（たとえば、特許文献１参照）。撚り導体は、一般的には、素線または集合撚り線を同心円状に並べて切断面の仕上がりが丸くなるように配置される。 Conventionally, a twisted conductor is known as a conductor used for a cable (for example, refer to Patent Document 1). The twisted conductor is generally arranged by arranging strands or aggregated strands in a concentric manner so that the cut surface has a rounded finish.

このような撚り方を同心撚りというが、同心撚りの導体を用いた電源ケーブルとしては、図８（ａ）に示すように、中心に１本の子撚り導体１４２を配置し、その周囲に６本の子撚り導体１４４を配置して撚り合わせた７本撚りの導体１５１を用いた電源ケーブル２０１や、図８（ｂ）に示すように、さらにその導体１５１の周囲に１２本の子撚り導体１４５を配置して撚り合わせた１９本撚りの導体１５２を用いた電源ケーブル２０２などが知られている。 Such a twisting method is called concentric twisting. However, as a power cable using a conductor of concentric twisting, as shown in FIG. 8A, one child twisting conductor 142 is arranged at the center and 6 twists are provided around it. A power cable 201 using a seven-strand conductor 151 obtained by arranging and twisting two child-twist conductors 144, and as shown in FIG. 8B, 12 child-twist conductors around the conductor 151. A power supply cable 202 using a 19-strand conductor 152 in which 145 are arranged and twisted is known.

特表２０１６−５１７１３３号公報Japanese Patent Publication No. 2016-517133

しかしながら、上述のように同心撚りされた導体１５１を用いた電源ケーブル２０１においては、たとえば、ロボットの関節部分など、捩りの発生する可動部に使用した場合、外層に位置する子撚り導体１４４により中心に位置する子撚り導体１４２が締め付けられて摩擦力が増大する。このため、子撚り導体１４２と子撚り導体１４４が互いに摩擦し合うことによって摩耗し、子撚り導体１４２、１４４の双方が断線しやすくなるという問題があった。なお、導体１５２を用いた電源ケーブル２０２においても同様に子撚り導体１４２、１４４、１４５が断線しやすくなる。 However, in the power cable 201 using the conductor 151 twisted concentrically as described above, when it is used in a movable part where twist occurs, such as a joint part of a robot, the twisted conductor 144 located in the outer layer causes the twist The twisted child conductor 142 located at is tightened and the frictional force is increased. Therefore, there is a problem that the child twist conductor 142 and the child twist conductor 144 are worn by friction with each other, and both the child twist conductors 142 and 144 are easily broken. In the power cable 202 using the conductor 152, the twisted conductors 142, 144, 145 are also likely to be broken.

この問題を軽減するため、図９に示すように、最も断線しやすい中心部に子撚り導体１４２を配置しないようにすることが考えられる。しかし、この場合においても、導体１６０は、内層１６１と外層１６３の二重構造になるため、内層１６１が断線しやすくなり、内層１６１と外層１６３に寿命差が生じてしまうという問題があった。このため、電源ケーブル２０１、２０２、２０３のいずれにおいても、子撚り導体１４２の断線や内外層間の寿命差を生じさせない程度の十分な耐捩り性を得ることができなかった。
本発明の目的は、耐捩り性が高い導体および該導体を用いた電源ケーブルを提供することである。 In order to reduce this problem, as shown in FIG. 9, it is conceivable not to arrange the child twisted conductor 142 in the central portion where the wire breakage is most likely. However, even in this case, since the conductor 160 has a double structure of the inner layer 161 and the outer layer 163, there is a problem that the inner layer 161 is easily broken and a difference in life occurs between the inner layer 161 and the outer layer 163. Therefore, in any of the power cables 201, 202, and 203, sufficient twist resistance that does not cause disconnection of the child twisted conductor 142 or a difference in life between the inner and outer layers cannot be obtained.
An object of the present invention is to provide a conductor having high twist resistance and a power cable using the conductor.

本発明の導体は、
複数の子撚り導体を一層撚り構造で親撚りした導体であって、
該導体を長さ方向と直交する方向に切断した切断面の構成において、
複数の前記子撚り導体の中央には、空隙が形成され、
前記子撚り導体と前記子撚り導体との間には、それぞれ補充部材が撚り合わせられていることを特徴とする。 The conductor of the present invention is
A conductor obtained by parent-twisting a plurality of child-twisted conductors in a single-layer twist structure,
In the configuration of the cut surface obtained by cutting the conductor in the direction orthogonal to the length direction,
A void is formed in the center of the plurality of child twisted conductors,
Replenishing members are twisted between the child twisted conductor and the child twisted conductor.

このように、子撚り導体と補充部材を交互に配置することにより、導体内に発生する摩擦力を低減することができる。また、導体の中央に空隙を形成することにより、導体内の空気層の割合を多くし、子撚り導体同士の干渉、および子撚り導体と補充部材の間の干渉を抑制することができる。このため、導体内における寿命差の問題を抑制することができ、疲労具合が導体全体に均一化される。よって、従来構造に比べて耐捩り性を大幅に向上させることができる。 As described above, by alternately disposing the twisted conductors and the supplementary members, it is possible to reduce the frictional force generated in the conductors. Further, by forming a void in the center of the conductor, it is possible to increase the proportion of the air layer in the conductor, and to suppress the interference between the twisted conductors and the interference between the twisted conductor and the supplementary member. Therefore, it is possible to suppress the problem of life difference in the conductor, and the fatigue condition is made uniform over the entire conductor. Therefore, the twisting resistance can be significantly improved as compared with the conventional structure.

また、本発明の導体は、
前記子撚り導体は、複数の素線を撚って形成された基本導体を３本以上撚り合わせて形成され、
前記補充部材の外径は、前記子撚り導体の外径よりも小さいことを特徴とする。 In addition, the conductor of the present invention,
The child twisted conductor is formed by twisting three or more basic conductors formed by twisting a plurality of strands,
The outer diameter of the replenishment member is smaller than the outer diameter of the twisted conductor.

このように、外径の大きさの異なる子撚り導体と補充部材を組み合わせることで、好適に導体内の空気層の割合を多くすることができる。また、補充部材の外径を子撚り導体の外径よりも小さくすることで、導体の切断面が円形になるように仕上がりを整えることができる。 As described above, by combining the twisted conductors having different outer diameters and the supplementary member, it is possible to suitably increase the ratio of the air layer in the conductor. Further, by making the outer diameter of the supplementary member smaller than the outer diameter of the twisted conductor, the finish can be adjusted so that the cut surface of the conductor becomes circular.

また、本発明の導体は、
前記切断面において、該導体の外接円内の断面積に対する素線の合計断面積の占積率が５０％以上６２％以下であることを特徴とする。
これにより、断線率が低く高寿命の導体を提供することができる。 In addition, the conductor of the present invention,
In the cut surface, the space factor of the total cross-sectional area of the wire with respect to the cross-sectional area within the circumscribed circle of the conductor is 50% or more and 62% or less.
This makes it possible to provide a conductor having a low disconnection rate and a long life.

また、本発明の導体は、
前記切断面において、該導体の外接円内の断面積が８ｍｍ²以上５４ｍｍ²以下であることを特徴とする。
これにより、導体の耐捩り性を向上させることが可能となる。 In addition, the conductor of the present invention,
In the cutting plane, the cross-sectional area of the circumscribed circle of the conductor is equal to or is 8 mm ² or more 54 mm ² or less.
This makes it possible to improve the twist resistance of the conductor.

また、本発明の導体は、
前記子撚り導体の外周および前記補充部材の外周の少なくとも一方が隙間なく螺旋状にテープで巻き付けられていることを特徴とする。
これにより、子撚り導体と補充部材が補強されて座屈しにくくなり、座屈した時の変形により発生する応力集中を防ぐことができるため、導体の耐屈曲性を向上させることができる。 In addition, the conductor of the present invention,
At least one of the outer circumference of the child twisted conductor and the outer circumference of the replenishment member is spirally wound with a tape without a gap.
As a result, the twisted conductor and the supplementary member are reinforced so that they are less likely to buckle, and the stress concentration that occurs due to deformation when buckling can be prevented, so the flex resistance of the conductor can be improved.

また、本発明の導体は、
前記補充部材は、複数の素線を撚り合わせて形成された素材、樹脂チューブ、または介在のいずれかから成ることを特徴とする。 In addition, the conductor of the present invention,
The replenishment member is made of a material formed by twisting a plurality of strands, a resin tube, or an interposition.

このように、補充部材には、金属以外の材質を用いることができる。
本発明の電源ケーブルは、
本発明に係る導体を用いて形成された電源ケーブルであることを特徴とする。
これにより、耐捩り性が高い電源ケーブルを提供することができる。 Thus, the replenishing member can be made of a material other than metal.
The power cable of the present invention is
A power cable formed by using the conductor according to the present invention.
This makes it possible to provide a power cable with high twist resistance.

本発明によれば、耐捩り性が高い導体および該導体を用いた電源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 a conductor having high twist resistance and a power cable using the conductor.

第１の実施の形態に係る導体を用いた電源ケーブルの概略断面図である。It is a schematic sectional drawing of the power cable using the conductor which concerns on 1st Embodiment. 第１の実施の形態に係る導体の構成を説明するための概略断面図である。It is a schematic sectional drawing for demonstrating the structure of the conductor which concerns on 1st Embodiment. 第１の実施の形態に係る導体を用いて行った捻回試験の状況を示す図である。It is a figure which shows the condition of the twist test performed using the conductor which concerns on 1st Embodiment. 第１の実施の形態に係る導体を用いて行った捻回試験の結果を示す図である。It is a figure which shows the result of the twist test performed using the conductor which concerns on 1st Embodiment. 第１の実施の形態に係る導体の断線率と占積率の相関関係を示す図である。It is a figure which shows the correlation of the wire breakage rate and space factor of a conductor which concerns on 1st Embodiment. 第２の実施の形態に係る導体の構成を説明するための概略断面図である。It is a schematic sectional drawing for demonstrating the structure of the conductor which concerns on 2nd Embodiment. 第２の実施の形態に係る導体を用いて行った屈曲試験の状況を示す図である。It is a figure which shows the condition of the bending test performed using the conductor which concerns on 2nd Embodiment. 従来の導体を用いた電源ケーブルの概略断面図である。It is a schematic sectional drawing of the power cable using the conventional conductor. 従来の導体を用いた電源ケーブルの概略断面図である。It is a schematic sectional drawing of the power cable using the conventional conductor.

（第１の実施の形態）
以下、図面を参照して、本発明の第１の実施の形態に係る導体について説明する。図１は、第１の実施の形態に係る導体を用いた電源ケーブルの概略断面図である。概略断面図は、捩れずかつ変形していない状態で長さ方向と直交する方向に切断した切断面を示している。ここで、図１に示すように、電源ケーブル１内には、導体２が配置されており、導体２の周りは絶縁体４、セパレータ６、シース８によって覆われている。 (First embodiment)
Hereinafter, a conductor according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a power cable using the conductor according to the first embodiment. The schematic cross-sectional view shows a cross section cut in a direction orthogonal to the length direction in a state where it is not twisted and is not deformed. Here, as shown in FIG. 1, the conductor 2 is arranged in the power cable 1, and the periphery of the conductor 2 is covered with the insulator 4, the separator 6, and the sheath 8.

図２は、第１の実施の形態に係る導体の構成を説明するための概略断面図である。図２に示すように、導体２には、基本導体２ｂ、子撚り導体２ｃ、および補充部材２ｄが含まれている。この導体２は、複数の子撚り導体２ｃが一層撚り構造（一重構造となるように撚られた構造）で親撚りして形成されている。 FIG. 2 is a schematic cross-sectional view for explaining the structure of the conductor according to the first embodiment. As shown in FIG. 2, the conductor 2 includes a basic conductor 2b, a twisted child conductor 2c, and a supplementary member 2d. The conductor 2 is formed by parent-twisting a plurality of child twisted conductors 2c with a single twisted structure (a structure twisted to have a single structure).

子撚り導体２ｃは、さらに３本の基本導体２ｂを撚り合わせることによって形成され、撚り合わせられた３本の子撚り導体２ｃの中央には、空隙１０が形成されている。なお、基本導体２ｂは、たとえば、軟銅線などの複数の素線を撚り合わせることによって形成されている。 The child twisted conductor 2c is formed by twisting three basic conductors 2b together, and a void 10 is formed in the center of the three twisted child twisted conductors 2c. The basic conductor 2b is formed, for example, by twisting a plurality of element wires such as annealed copper wires.

補充部材２ｄは、子撚り導体２ｃと子撚り導体２ｃとの間に形成される凹状の隙間２ｈに配置され、基本導体２ｂと同様に、軟銅線などの複数の素線を撚り合わせることによって形成されている。また、補充部材２ｄの外径は、子撚り導体２ｃの外径よりも小さく形成されている。なお、補充部材２ｄは、すべての隙間２ｈに配置されている必要はなく、一部の隙間２ｈのみに配置されていてもよい。また、一箇所の隙間２ｈに複数の補充部材２ｄが配置されていてもよい。 The replenishment member 2d is disposed in the concave gap 2h formed between the child twist conductor 2c and the child twist conductor 2c, and is formed by twisting a plurality of strands such as annealed copper wire together like the basic conductor 2b. Has been done. Further, the outer diameter of the supplementary member 2d is smaller than the outer diameter of the twisted conductor 2c. The replenishment member 2d does not have to be arranged in all the gaps 2h, and may be arranged only in a part of the gaps 2h. Further, a plurality of replenishment members 2d may be arranged in one space 2h.

また、補充部材２ｄには、素線に代えて、樹脂チューブや介在を用いてもよい。介在には、たとえば、綿糸、ＰＥ（ポリエチレン）やＰＥＴ（ポリエチレンテレフタラート）等の熱可塑性樹脂、またはＰＴＦＥ（ポリテトラフルオロエチレン）等のフッ素樹脂製を用いることができる。 Further, as the replenishment member 2d, a resin tube or an interposition may be used instead of the strand. For the interposition, for example, a cotton thread, a thermoplastic resin such as PE (polyethylene) or PET (polyethylene terephthalate), or a fluororesin such as PTFE (polytetrafluoroethylene) can be used.

次に、導体２の製造方法について説明する。まず中央に空隙１０が形成されるようにして３本の子撚り導体２ｃを三角形状に束ねて配置し（配置工程）、次に、子撚り導体２ｃと子撚り導体２ｃとの間に形成された凹状の隙間２ｈに３本の補充部材２ｄを配置する（補充配置工程）。ここで、補充部材２ｄは、３本の子撚り導体２ｃとは逆向きの三角形状に配置される。また、補充部材２ｄは、子撚り導体２ｃと子撚り導体２ｃとの間に形成された隙間２ｈに配置される。この状態で子撚り導体２ｃと補充部材２ｄを一層で撚り合わせる（一層撚り工程）ことによって導体２が形成される。 Next, a method of manufacturing the conductor 2 will be described. First, the three twisted conductors 2c are arranged in a triangular shape so as to form the void 10 in the center (arrangement step), and then formed between the twisted conductors 2c and 2c. The three supplementary members 2d are arranged in the concave gap 2h (supplemental arrangement step). Here, the replenishment member 2d is arranged in a triangular shape that is opposite to the three twisted conductors 2c. Further, the replenishment member 2d is arranged in the gap 2h formed between the child twist conductor 2c and the child twist conductor 2c. In this state, the conductor 2 is formed by twisting the child twisted conductor 2c and the replenishment member 2d in one layer (one-layer twisting step).

なお、第１の実施の形態においては、子撚り導体２ｃと補充部材２ｄがそれぞれ３本である場合を例に説明しているが、子撚り導体２ｃと補充部材２ｄが４本以上であっても、中央に空隙１０が形成されていれば、本願発明の効果を発揮することができる。 In the first embodiment, the case where each of the child twist conductors 2c and the supplementary members 2d is three is described as an example, but the child twist conductors 2c and the supplementary members 2d are four or more. However, if the void 10 is formed in the center, the effect of the present invention can be exhibited.

このようにして形成された導体２は、子撚り導体２ｃと補充部材２ｄが空隙１０の周りに交互に配置された一層撚り構造を有している。また、この状態で、子撚り導体２ｃの外周面同士が接触し、かつ基本導体２ｂの外周面と子撚り導体２ｃの外周面もまた接触している。さらに、子撚り導体２ｃの外周面と補充部材２ｄの外周面もまた接触している。 The conductor 2 thus formed has a single twist structure in which the child twist conductors 2c and the supplementary members 2d are alternately arranged around the void 10. Further, in this state, the outer peripheral surfaces of the child twisted conductor 2c are in contact with each other, and the outer peripheral surface of the basic conductor 2b and the outer peripheral surface of the child twisted conductor 2c are also in contact with each other. Further, the outer peripheral surface of the twisted conductor 2c and the outer peripheral surface of the replenishing member 2d are also in contact with each other.

なお、導体２の外接円内の断面積（以下、導体断面積という。）に対する素線（基本導体２ｂおよび補充部材２ｄを形成する素線）の全合計断面積の占積率は、６２％以下であることが好ましく、下限値は５０％以上であるのが好ましい。また、導体２の導体断面積は、８ｍｍ²以上５４ｍｍ²以下であることが好ましい。 The space factor of the total cross-sectional area of the wires (the wires forming the basic conductor 2b and the supplementary member 2d) with respect to the cross-sectional area within the circumscribed circle of the conductor 2 (hereinafter referred to as the conductor cross-sectional area) is 62%. It is preferably the following or less, and the lower limit is preferably 50% or more. The conductor cross-sectional area of the conductor 2 is preferably 8 mm ² or more 54 mm ² or less.

絶縁体４は、ポリ塩化ビニルから成る厚さ１．６ｍｍ程度の層を構成しており、セパレータ６は、不織布によって構成され、絶縁体４層を押え巻きしている。また、シース８は、ポリウレタンエラストマーによって構成された、電源ケーブル１の最外層を成す層を構成している。 The insulator 4 constitutes a layer of polyvinyl chloride having a thickness of about 1.6 mm, and the separator 6 is constituted by a non-woven fabric, and the insulator 4 layer is pressed and wound. In addition, the sheath 8 constitutes a layer which is an outermost layer of the power cable 1 and is made of polyurethane elastomer.

この第１の実施の形態に係る導体２によれば、子撚り導体２ｃと補充部材２ｄを交互に配置することにより、導体２内に発生する摩擦力を低減することができる。また、導体２の中央に空隙１０を形成することにより、導体２内の空気層の割合を多くし、子撚り導体２ｃ同士の干渉、および子撚り導体２ｃと補充部材２ｄの間の干渉を抑制することができる。このため、導体２内の寿命差を低減することができ、疲労具合が導体２全体に均一化される。よって、従来構造に比べて耐捩り性を大幅に向上させることができる。 According to the conductor 2 of the first embodiment, the twisted conductors 2c and the supplementary members 2d are alternately arranged, so that the frictional force generated in the conductor 2 can be reduced. Further, by forming the void 10 in the center of the conductor 2, the ratio of the air layer in the conductor 2 is increased, and the interference between the child twist conductors 2c and the interference between the child twist conductor 2c and the supplementary member 2d are suppressed. can do. Therefore, the life difference in the conductor 2 can be reduced, and the degree of fatigue is made uniform throughout the conductor 2. Therefore, the twisting resistance can be significantly improved as compared with the conventional structure.

また、３本の子撚り導体２ｃの中央に空隙１０が形成されているため、図８（ａ）に示す従来の導体１５１のように、捩れたときに中央の子撚り導体１４２に応力が集中することを防止できる。 Further, since the void 10 is formed in the center of the three twisted conductors 2c, stress is concentrated on the twisted conductor 142 in the center when twisted as in the conventional conductor 151 shown in FIG. 8A. Can be prevented.

また、補充部材２ｄの外径を子撚り導体２ｃの外径よりも小さくすることで、導体２の切断面が円形になるように仕上がりを整えることができる。
また、導体断面積に対する素線の全合計断面積の占積率を６２％以下にすることにより、従来技術と比較して断線率を半減できるため、断線率が低く高寿命の導体２を提供することができる。なお、上述の占積率が６２％を超える場合には、後述する実施例の図４に示すように、断線率が上昇し、導体２は十分な耐捩り性を得ることができない。一方、上述の占積率が５０％未満の場合には、空隙の割合が増加して変形しやすくなり導体２の切断面を円形に保持できなくなるため、構造的に導体２を作成することができない。 Also, by making the outer diameter of the replenishment member 2d smaller than the outer diameter of the twisted conductor 2c, the finish can be adjusted so that the cut surface of the conductor 2 becomes circular.
Further, by setting the space factor of the total cross-sectional area of the wires to the conductor cross-sectional area to 62% or less, the wire breakage rate can be halved as compared with the conventional technique, so that the conductor 2 having a low wire breakage rate and a long life is provided. can do. When the above-mentioned space factor exceeds 62%, the wire breakage rate increases and the conductor 2 cannot obtain sufficient twist resistance, as shown in FIG. On the other hand, when the above-mentioned space factor is less than 50%, the ratio of the voids increases and it is easy to deform, and the cut surface of the conductor 2 cannot be kept circular, so that the conductor 2 can be structurally created. Can not.

また、導体断面積を８ｍｍ²以上５４ｍｍ²以下にすることにより、導体２の耐捩り性を向上させることが可能となる。なお、上述の断面積が８ｍｍ²未満である場合には、導体２が一層撚りでも二層撚り以上でも十分な耐捩り性を発揮できるが、そもそも外径が細くなり可動時に導体２が受ける変形が小さくなるため、導体２の耐捩り性を向上させる技術としての意味は薄れる。一方、上述の断面積が５４ｍｍ²を超えると外径が太くなりすぎて可動部に用いるのには適さない。 Further, by making the conductor cross-sectional area 8 mm ² or more 54 mm ² or less, it becomes possible to improve the twist resisting-resistant conductor 2. When the above-mentioned cross-sectional area is less than 8 mm ² , sufficient twist resistance can be exhibited even if the conductor 2 is twisted in one layer or more than two layers, but in the first place the outer diameter becomes small and the conductor 2 is deformed when moving. Is smaller, the meaning as a technique for improving the twist resistance of the conductor 2 is diminished. On the other hand, if the above-mentioned cross-sectional area exceeds 54 mm ² , the outer diameter becomes too large and it is not suitable for use in a movable part.

［実施例１］
次に、第１の実施の形態に係る導体２、及び従来の導体１５２、１６０を用いて行った断線率の実験について説明する。まず、実験において、試験者は、第１の実施の形態に係る導体２を用いた電源ケーブル１、従来の導体１５２を用いた電源ケーブル２０２、従来の導体１６０を用いた電源ケーブル２０３を準備した。ここで、導体２には、導体断面積が２２ｍｍ²と３５ｍｍ²の２種類のサンプルを用意した。なお、従来の導体１５２、１６０の導体断面積は、それぞれ３５ｍｍ²、２２ｍｍ²である。また、撚り方は、第１の実施の形態に係る導体２が一層撚りなのに対して、従来の導体１５２、１６０は多層撚りであり、占積率は、導体２が５６．８％〜６３．８７％、従来の導体１５２が６７．５％、従来の導体１６０が６７．７％である。また、サンプルとして用意した各電源ケーブルの長さは、それぞれ２０５ｍｍである。また、電源ケーブル１、２０２、２０３の外径は、それぞれ、１５．５ｍｍ、１５．６ｍｍ、１４．５ｍｍである。 [Example 1]
Next, a description will be given of an experiment of a wire breakage rate performed using the conductor 2 according to the first embodiment and the conventional conductors 152 and 160. First, in an experiment, the tester prepared the power cable 1 using the conductor 2 according to the first embodiment, the power cable 202 using the conventional conductor 152, and the power cable 203 using the conventional conductor 160. .. Here, as the conductor 2, two types of samples having conductor cross-sectional areas of 22 mm ² and 35 mm ² were prepared. Incidentally, the conductor cross-sectional area of a conventional conductor 152, 160 are each 35 mm ^2, 22 mm ^2. Regarding the twisting method, the conductor 2 according to the first embodiment is more twisted, whereas the conventional conductors 152 and 160 are multi-layered twists, and the space factor is 56.8% to 63. 87%, 67.5% for the conventional conductor 152, and 67.7% for the conventional conductor 160. The length of each power cable prepared as a sample is 205 mm. The outer diameters of the power cables 1, 202 and 203 are 15.5 mm, 15.6 mm and 14.5 mm, respectively.

次に、図３に示すように、捻回試験機５０を用意して各サンプルをセットした。ここで、固定アーム６２への固定箇所と回転部６４への固定箇所の間の固定間距離Ｌは、２００ｍｍである。実験においては、表１に示すように、サンプルが捻回試験機５０にセットされた状態で回転部を±２５０°の回転角度で４５往復／分回転させた。 Next, as shown in FIG. 3, a twist tester 50 was prepared and each sample was set. Here, the fixed distance L between the fixed portion on the fixed arm 62 and the fixed portion on the rotating portion 64 is 200 mm. In the experiment, as shown in Table 1, the rotating part was rotated 45 reciprocations/minute at a rotation angle of ±250° while the sample was set in the torsion tester 50.

なお、断線率の実験については、図４に示すように行った。すなわち、導体断面積が２２ｍｍ²、かつ占積率が５８．３％の導体２の断線率については、捻回の回数が１０万回目、２０万回目、３０万回目、４０万回目、５０万回目のそれぞれの時点で測定を行った。それ以外の導体２の断線率については、捻回の回数が３０万回目の時点のみにおいて測定を行った。 The disconnection rate experiment was conducted as shown in FIG. That is, regarding the wire breakage rate of the conductor 2 having a conductor cross-sectional area of 22 mm ² and a space factor of 58.3%, the number of twists was 100,000, 200,000, 300,000, 400,000, 500,000. The measurement was performed at each time point of the second round. The other wire breakage rates of the conductor 2 were measured only when the number of twists was 300,000.

また、従来の導体１５２を用いた実験においては、捻回の回数が３０万回目の時点のみにおいて測定を行った。また、従来の導体１６０を用いた実験においては、捻回の回数が１０万回目、２０万回目、３０万回目の時点において測定を行った。 Further, in the experiment using the conventional conductor 152, the measurement was performed only when the number of twists was 300,000. In addition, in the experiment using the conventional conductor 160, the measurement was performed at the times of the number of twists of 100,000, 200,000, and 300,000.

図４に示す実験結果において、３０万回目の断線率を比較すると、従来の導体１５２の断線率がすべての層で１００％であるのに対し、中心に素線を位置させない構造の従来の導体１６０は、外層の断線率が６４．４％に低減され、内外層全体で断線率が７３．３％となった。 Comparing the breakage rates at the 300,000th time in the experimental results shown in FIG. 4, the breakage rate of the conventional conductor 152 is 100% in all layers, whereas the breakage rate of the conventional conductor in which the strands are not positioned in the center is 100%. For 160, the disconnection rate of the outer layer was reduced to 64.4%, and the disconnection rate of the entire inner and outer layers was 73.3%.

これに対し、第１の実施の形態に係る導体２の断線率は、導体断面積が２２ｍｍ²のサンプルにおいては、占積率が５６．８％のときに５．９％、占積率が５８．３％のときに２１．９％となった。導体断面積が３５ｍｍ²のサンプルにおいては、占積率が５７．５７％〜６３．８７％の間で１４．５２％〜７３．２４％となった。 In contrast, breakage of the conductor 2 according to the first embodiment, in the sample of the conductor cross-sectional area is 22 mm ^2, the space factor is 5.9% at 56.8 percent, space factor When it was 58.3%, it was 21.9%. In the sample having the conductor cross-sectional area of 35 mm ^2, the space factor was 14.52% to 73.24% between 57.57% and 63.87%.

すなわち、一層撚りの導体２においては、多層撚りの導体１５２、１６０よりも大幅に断線率が低減される。特に、導体２の断線率は、占積率を６２％以下にした場合（図４において、占積率６３．８７％のサンプル以外）に大幅に低くなる。 That is, in the conductor 1 having a single-layer twist, the disconnection rate is significantly reduced as compared with the conductors 152 and 160 having a multi-layer twist. In particular, the disconnection rate of the conductor 2 is significantly reduced when the space factor is set to 62% or less (other than the sample having the space factor of 63.87% in FIG. 4).

なお、従来の導体１６０は、内層１６１と外層１６３から成る二層撚りであるため、内層１６１の断線率が１００％と高く、一層撚りの導体２より寿命が短くなる。
図５は、第１の実施の形態に係る導体２の断線率（捻回の回数３０万回目）と占積率の相関関係を示すグラフである。グラフ中に示される点は、導体２の各占積率に対応する断線率をプロットしたものである。また、グラフ中の直線は、断線率と占積率の相関関係に基づいて計算した導体２の寿命予測線である。 Since the conventional conductor 160 is a two-layer twist consisting of the inner layer 161 and the outer layer 163, the disconnection rate of the inner layer 161 is as high as 100%, and the life is shorter than that of the conductor 2 having a further twist.
FIG. 5 is a graph showing the correlation between the wire breakage rate (the number of twists of 300,000 times) and the space factor of the conductor 2 according to the first embodiment. The points shown in the graph are plots of the wire breakage rates corresponding to the respective space factors of the conductor 2. The straight line in the graph is a life prediction line of the conductor 2 calculated based on the correlation between the wire breakage rate and the space factor.

本グラフによれば、占積率が６３．８％では断線率が７３．２％まで上昇すること、および占積率が低い方が断線率も低く、導体２が高寿命になる傾向があることなどがわかる。また、寿命予測線を参照すると占積率５５％以下では断線率１０％以下となり、占積率６２％以上では断線率５０％以上になることが予測される。なお、占積率５０％未満の導線は構造上作製不可能である。 According to this graph, when the space factor is 63.8%, the wire breakage rate rises to 73.2%, and when the space factor is low, the wire breakage rate is low and the conductor 2 tends to have a long life. I understand things. Further, referring to the life prediction line, it is predicted that the breakage rate is 10% or less when the space factor is 55% or less, and the breakage rate is 50% or more when the space factor is 62% or more. A conductor wire having a space factor of less than 50% cannot be manufactured due to its structure.

（第２の実施の形態）
次に、第２の実施の形態に係る導体について説明する。第２の実施の形態では、第１の実施の形態と異なる部分について詳細に説明し、重複する部分については説明を省略する。なお、第２の実施の形態の説明においては、第１の実施の形態に係る導体２の構成と同一の構成には、第１の実施の形態の説明で用いたのと同一の符号を用いて説明を行なう。 (Second embodiment)
Next, the conductor according to the second embodiment will be described. In the second embodiment, parts different from those in the first embodiment will be described in detail, and description of overlapping parts will be omitted. In the description of the second embodiment, the same components as those of the conductor 2 according to the first embodiment are designated by the same reference numerals as those used in the description of the first embodiment. And explain.

図６は、第２の実施の形態に係る導体２´を示す断面図である。図６に示すように、導体２´においては、子撚り導体２ｃの外周と補充部材２ｄの外周にはテープ８０が巻き付けられている。なお、テープ８０は、子撚り導体２ｃの外周と補充部材２ｄの外周に隙間なく螺旋状に巻き付けられている。 FIG. 6 is a sectional view showing a conductor 2'according to the second embodiment. As shown in FIG. 6, in the conductor 2', the tape 80 is wound around the outer circumference of the twisted conductor 2c and the outer circumference of the supplementary member 2d. The tape 80 is spirally wound around the outer circumference of the twisted conductor 2c and the outer circumference of the supplementary member 2d.

ここで、テープ８０は素材にＰＴＦＥ（ポリテトラフルオロエチレン）を用いて形成されている。なお、テープ８０の素材はＰＴＦＥに限定されず、ＥＴＦＥ（エチレン・四フッ化エチレン共重合体）などのＰＴＦＥ以外のフッ素樹脂、ＦＥＰ（四フッ化エチレン・六フッ化プロピレン共重合体）、ＰＥＴ（ポリエチレンテレフタラート）などの熱可塑性樹脂、およびＡＬ／ＰＥＴ（アルミ箔とＰＥＴフィルムを貼り合わせた複合材料）等の金属箔と樹脂フィルムの複合材料を用いてもよい。また、テープ８０は、必ずしも子撚り導体２ｃと補充部材２ｄの双方の外周に巻き付ける必要はなく、子撚り導体２ｃの外周と補充部材２ｄの外周の少なくとも一方に巻き付けられていればよい。 Here, the tape 80 is formed by using PTFE (polytetrafluoroethylene) as a material. The material of the tape 80 is not limited to PTFE, and fluororesins other than PTFE such as ETFE (ethylene/tetrafluoroethylene copolymer), FEP (tetrafluoroethylene/hexafluoropropylene copolymer), PET A thermoplastic resin such as (polyethylene terephthalate) and a composite material of a metal foil and a resin film such as AL/PET (a composite material obtained by laminating an aluminum foil and a PET film) may be used. Moreover, the tape 80 does not necessarily have to be wound around the outer circumferences of both the child twist conductor 2c and the supplementary member 2d, and may be wound around at least one of the outer circumference of the child twist conductor 2c and the outer periphery of the supplementary member 2d.

このように、子撚り導体２ｃの外周と補充部材２ｄの外周の少なくとも一方に隙間なく螺旋状にテープ８０を巻き付けることより、導体２（図２参照）の耐屈曲性を向上させることができる。 As described above, by winding the tape 80 spirally around at least one of the outer circumference of the child-twisted conductor 2c and the outer circumference of the replenishing member 2d, the bending resistance of the conductor 2 (see FIG. 2) can be improved.

具体的に説明すると、たとえば、二層撚りの導体（図示せず）を屈曲させた場合、導体に圧縮応力が掛かり座屈が生じる。座屈が生じると座屈部分が応力集中点となり断線に繋がる。なお、一層撚りの導体２（図２参照）を屈曲させた場合であっても、導体２に圧縮応力が掛かるため、座屈が生じ断線を回避することはできない。 More specifically, for example, when a two-layer twisted conductor (not shown) is bent, compressive stress is applied to the conductor and buckling occurs. When buckling occurs, the buckling portion becomes a stress concentration point and leads to disconnection. Even when the conductor 2 with a single twist (see FIG. 2) is bent, a compressive stress is applied to the conductor 2, so that buckling occurs and it is impossible to avoid disconnection.

ここで、子撚り導体２ｃの外周と補充部材２ｄの外周のいずれか、もしくは子撚り導体２ｃの外周と補充部材２ｄの外周の双方を隙間なく螺旋状にテープ８０で巻き付けることにより、子撚り導体２ｃおよび補充部材２ｄの少なくとも一方が補強されて座屈しにくくなる。これにより、座屈時の変形により発生する応力集中を防止できるため、導体２の耐屈曲性を向上させた導体２´を提供することができる。 Here, either the outer circumference of the child twist conductor 2c or the outer circumference of the supplementary member 2d, or both the outer circumference of the child twist conductor 2c and the outer periphery of the supplementary member 2d are spirally wound with a tape 80 without a gap, thereby forming the child twist conductor. At least one of 2c and the replenishment member 2d is reinforced so that it is less likely to buckle. As a result, stress concentration that occurs due to deformation during buckling can be prevented, so that it is possible to provide the conductor 2 ′ with improved flex resistance of the conductor 2.

［実施例２］
次に、第１の実施の形態に係る導体２（テープ巻なし）と第２の実施の形態に係る導体２´（テープ巻あり）を用いて行ったテープ巻きの効果に関する実験について説明する。まず、実験において、試験者は、第１の実施の形態に係る導体２を用いた電源ケーブル１、第２の実施の形態に係る導体２´を用いた電源ケーブルを準備した。ここで、表２に示すように、導体２の占積率は５８．３０％であり、導体２´の占積率は５２．３０％である。 [Example 2]
Next, an experiment on the effect of tape winding performed using the conductor 2 according to the first embodiment (without tape winding) and the conductor 2′ according to the second embodiment (with tape winding) will be described. First, in an experiment, the tester prepared a power supply cable 1 using the conductor 2 according to the first embodiment and a power supply cable using the conductor 2′ according to the second embodiment. Here, as shown in Table 2, the space factor of the conductor 2 is 58.30%, and the space factor of the conductor 2'is 52.30%.

次に、図７に示すように、屈曲試験機９０を用意して各電源ケーブルを一対の支持棒８８の間に挟み込んだ。そして、各電源ケーブルの下端に２ｋｇの錘９２を装着し、±９０°の屈曲角度で屈曲させた。なお、実験において、支持棒８８の半径は２５ｍｍであり、支持棒８８間の距離は、電源ケーブルの直径＋２ｍｍである。また、電源ケーブルは、３０回／分の屈曲速度にて屈曲させた。 Next, as shown in FIG. 7, a bending tester 90 was prepared and each power cable was sandwiched between a pair of support bars 88. Then, a 2 kg weight 92 was attached to the lower end of each power cable and bent at a bending angle of ±90°. In the experiment, the radius of the support rod 88 is 25 mm, and the distance between the support rods 88 is the diameter of the power cable+2 mm. The power cable was bent at a bending speed of 30 times/minute.

実験結果は、表２に示すように、第１の実施の形態に係る導体２（テープ巻なし）において、試験回数９２，０００回の時点で完全断線し、第２の実施の形態に係る導体２´（テープ巻あり）において、試験回数４９７，５００回の時点で完全断線するという結果を得た。すなわち、子撚り導体２ｃの外周と補充部材２ｄの外周にテープ８０を隙間なく螺旋状に巻き付けることにより、導体の耐屈曲性が大幅に向上することがわかった。 As a result of the experiment, as shown in Table 2, in the conductor 2 (without tape winding) according to the first embodiment, the conductor was completely disconnected at the time of 92,000 test times, and the conductor according to the second embodiment was obtained. In 2'(with tape winding), complete disconnection was obtained at the time of testing 497,500 times. That is, it was found that the bending resistance of the conductor was significantly improved by winding the tape 80 spirally around the outer periphery of the twisted conductor 2c and the outer periphery of the replenishment member 2d without a gap.

なお、上述の各実施の形態において、素線は、導電性を有する素材であれば、必ずしも軟銅線に限定されない。
また、上述の各実施の形態において、絶縁体４の厚さ、電源ケーブル１の外径の数値はあくまでも一例であり、必ずしもこのサイズに限定されない。 In addition, in each of the above-described embodiments, the strand is not necessarily limited to the annealed copper strand as long as it is a conductive material.
Further, in each of the above-described embodiments, the numerical values of the thickness of the insulator 4 and the outer diameter of the power cable 1 are merely examples, and are not necessarily limited to these sizes.

また、上述の各実施の形態において、基本導体２ｂの外径と補充部材２ｄの外径が同一サイズである場合を例示しているが、両者の外径は必ずしも同一でなくてもよい。たとえば、基本導体２ｂの外径が補充部材２ｄの外径よりも大きくてもよく、補充部材２ｄの外径が基本導体２ｂの外径よりも大きくてもよい。
また、上述の各実施の形態において、子撚り導体２ｃに含まれる基本導体２ｂは複数であればよい。 Further, in each of the above-described embodiments, the case where the outer diameter of the basic conductor 2b and the outer diameter of the supplementary member 2d are the same size is illustrated, but the outer diameters of the both do not necessarily have to be the same. For example, the outer diameter of the basic conductor 2b may be larger than the outer diameter of the supplementary member 2d, and the outer diameter of the supplemental member 2d may be larger than the outer diameter of the basic conductor 2b.
In addition, in each of the above-described embodiments, the basic conductor 2b included in the twisted child conductor 2c may be plural.

１電源ケーブル
２導体
２´ 導体
２ｂ基本導体
２ｃ子撚り導体
２ｄ補充部材
２ｈ隙間
４絶縁体
６セパレータ
８シース
１０空隙
５０捻回試験機
６２固定アーム
６４回転部
８０テープ
８８支持棒
９０屈曲試験機
９２錘
１４２子撚り導体
１４４子撚り導体
１５１従来の導体
１５２従来の導体
１６０従来の導体
１６１内層
１６３外層
２０１電源ケーブル
２０２電源ケーブル
２０３電源ケーブル
Ｌ固定間距離 DESCRIPTION OF SYMBOLS 1 power cable 2 conductor 2'conductor 2b basic conductor 2c child twisted conductor 2d replenishment member 2h gap 4 insulator 6 separator 8 sheath 10 void 50 twist tester 62 fixed arm 64 rotating part 80 tape 88 support rod 90 bending tester 92 Weight 142 Twisted conductor 144 Twisted conductor 151 Conventional conductor 152 Conventional conductor 160 Conventional conductor 161 Inner layer 163 Outer layer 201 Power cable 202 Power cable 203 Power cable L Fixed distance

Claims

A conductor obtained by parent-twisting a plurality of child-twisted conductors in a single-layer twist structure,
In the configuration of the cut surface obtained by cutting the conductor in the direction orthogonal to the length direction,
A void is formed in the center of the plurality of child twisted conductors,
A supplementary member is twisted between the child twisted conductor and the child twisted conductor.

The child twisted conductor is formed by twisting three or more basic conductors formed by twisting a plurality of strands,
The conductor according to claim 1, wherein an outer diameter of the replenishment member is smaller than an outer diameter of the twisted conductor.

3. The conductor according to claim 2, wherein the space factor of the total cross-sectional area of the wire with respect to the cross-sectional area within the circumscribed circle of the conductor is 50% or more and 62% or less on the cut surface.

In the cutting surface, the conductor according to claim 1 the cross-sectional area of the circumscribed circle of the conductor is equal to or is 8 mm ² or more 54 mm ² or less.

The conductor according to any one of claims 1 to 4, wherein at least one of the outer circumference of the child twisted conductor and the outer circumference of the supplementary member is spirally wound with a tape without a gap.

The conductor according to any one of claims 1 to 5, wherein the replenishment member is made of a material formed by twisting a plurality of strands, a resin tube, or an interposition.

A power cable, which is formed using the conductor according to any one of claims 1 to 6.