JP4639723B2 - Twisted wire and flexible cable using the same - Google Patents

Description

  The present invention relates to a bending-resistant cable for power supply / power and signal transmission.

  A conventional general cable has a stranded wire layer formed by twisting conductor wires around a central conductor. Here, depending on how the conductor strands are twisted, there are aggregate strands and concentric strands.

  As shown in FIG. 10, a central conductor 101 composed of a plurality of wires (seven in FIG. 10) and a plurality of conductor wires 103 (54 in FIG. 10) are gathered together and assembled. The stranded wire 100 has a stranded wire layer 102 having a three-layer structure. Further, as shown in FIG. 11, a plurality (54 in FIG. 11) of conductor wires 103 are layered around the central conductor 101 composed of a plurality of wires (7 in FIG. 11). And what is twisted concentrically is the concentric stranded wire 110, and has a stranded wire layer 112 having a three-layer structure. Each twisted wire 100, 110 may have an insulating coating layer 105 around it, depending on the application or need. Further, as the constituent wire of the center conductor and the conductor wire 103, generally, a copper wire having high conductivity is used.

  Power cables for driving such as robot arms, power / power cables such as outdoor power transmission lines, and signal transmission (signal line) cables are used in areas where movement is intense. ) Is accompanied. For this reason, these cables are required to have good bending characteristics. For example, there is a copper alloy wire composed of a heat-treated copper alloy containing 0.1 to 0.9 wt% of Sn, 0.1 to 0.5 wt% of In, 50 ppm or less of oxygen, and the balance of Cu (for example, see Patent Document 1) ).

JP 2000-96200 A

  With the copper alloy wire described in Patent Document 1, good bending characteristics can be obtained. This is because the tensile strength of the copper alloy itself is improved by optimizing the composition and manufacturing process (heat treatment process) of the copper alloy.

  By the way, in the copper alloy wire described in Patent Document 1, the bending life is determined by the tensile strength of the copper alloy wire (conductor wire). The higher the tensile strength of the copper alloy wire, the longer the bending life. However, since there is a limit to the improvement of the tensile strength of the copper alloy wire, there is a limit to the improvement of the bending property.

  An object of the present invention created in view of the above circumstances is to provide a twisted wire having good bending characteristics and a bending-resistant cable using the same without being influenced by the tensile strength of the conductor wire. .

In order to achieve the above object, a stranded wire according to the present invention is a stranded wire having a stranded wire layer formed by twisting a conductor strand around a central conductor, and is more tensioned than the conductor strand and the conductor strand. High-strength, high-strength conductor strands that are twisted together to form the stranded wire layer, and the conductor strand is an annealed material of Cu-In alloy or Cu-Sn-In alloy Or it is a full annealing treatment material, and the said high intensity | strength conductor strand is comprised by the annealing untreated material of a Cu-In type alloy or a Cu-Sn-In type alloy .

  Of the stranded wire layer, the layer immediately below the outermost layer may be composed of a high-strength conductor wire. Moreover, you may comprise all the layers except the outermost layer of a strand wire layer with a high intensity | strength conductor strand. Furthermore, at least a part of the center conductor may be composed of a high-strength conductor wire.

  The high-strength conductor wire may consist of one type of wire. The high-strength conductor wire may include at least two types of wires having different tensile strengths.

  On the other hand, the bending resistant cable according to the present invention is provided with an insulating coating layer around the above-described stranded wire.

  According to the present invention, it is possible to obtain an excellent effect that a stranded wire capable of adjusting bending characteristics and conductivity can be obtained.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 shows a cross-sectional view of a stranded wire according to a preferred embodiment of the present invention, and FIG. 2 shows an enlarged cross-sectional view of a high-strength conductor wire in FIG.

  As shown in FIG. 1, a stranded wire 10 according to a preferred embodiment of the present invention includes a conductor wire 13 around a central conductor 11 and a high-strength conductor element having a higher tensile strength than the conductor wire 13. A stranded wire layer 12 having a multilayer structure (three-layer structure in FIG. 1) formed by twisting the wire 14 is provided. What provided the insulating coating layer 15 in the outer periphery of this twisted wire 10 turns into a bending resistant cable.

  Here, the stranded wire 10 is a collective stranded wire, and includes a central conductor 11 composed of a plurality of (7 in FIG. 1) strands and a plurality (54 in FIG. 1) of strands (conductor strands). 13 and high-strength conductor wire 14) are bundled together. Further, as shown in FIG. 1, the center conductor 11 may be formed of only the conductor wire 13 in addition to the bundle wire in which the conductor wire 13 and the high-strength conductor wire 14 are mixed.

  As a constituent material of the conductor wire 13, a material having a conductivity of 80% IACS or more is preferable. For example, pure Cu (for example, tough pitch copper (hereinafter referred to as TPC) having a tensile strength of about 200 MPa), conductivity is good. Good Cu alloy (for example, Cu-Ag alloy), Cu alloy with high tensile strength (for example, Cu-In alloy, specifically Cu-In alloy having a tensile strength of about 300 MPa or more, Cu-Sn-In Alloy).

The high-strength conductor wire 14 is not particularly limited as long as it has a higher tensile strength than the conductor strand 13. For example, when the conductor strand 13 is made of TPC, a Cu—In alloy is used. Etc. Moreover, when the conductor strand 13 is comprised with the annealing treatment material of a Cu-In type alloy, or a full annealing treatment material, the non-annealing treatment material of a Cu-In type alloy etc. are mentioned .

  Increasing the proportion of the high-strength conductor wire 14 occupying the entire stranded wire layer 12 significantly increases the tensile strength but decreases the electrical conductivity. Therefore, the ratio of the high-strength conductor wire 14 is appropriately selected according to the desired conductivity and tensile strength.

  Further, as shown in FIG. 3 as a modification of the stranded wire 10 according to the present embodiment shown in FIG. 1, the stranded wire 30 is composed of a plurality of strands (seven in FIG. 3) (conductor strands). A plurality of wires (54 wires in FIG. 3) (conductor wires 13 and high-strength conductor wires 14) are mixed around a central conductor 11 composed of a bundle of 13 and high-strength conductor wires 14). Concentric strands in which the bundled wires are layered and concentrically twisted. That is, the stranded wire 30 is a stranded wire layer having a multilayer structure (three-layer structure in FIG. 3) in which the conductor strand 13 and the high-strength conductor strand 14 are concentrically twisted around the central conductor 11. 32. What provided the insulating coating layer 15 in the outer periphery of this twisted wire 30 becomes a bending-resistant cable.

  Next, the operation of the present embodiment will be described.

  In general, when the wire diameter is the same, the steel wire has a tensile strength of about 2 to 3 times that of the conductor wire 13 made of Cu or Cu alloy. The twist life can be improved by forming the stranded wire layer 12 by twisting together. However, when Cu (conductor wire 13) and Fe (steel wire) are left in contact in the atmosphere or in a humid environment, corrosion proceeds due to battery action corrosion (dissimilar metal contact corrosion).

  Therefore, in the stranded wire 10 according to the present embodiment, a copper-coated steel wire in which the periphery of the steel wire 21 is covered with the copper coating layer 22 is used as an example of the high-strength conductor wire 14. As a result, the contact between the conductor strand 13 and the high-strength conductor strand (copper-coated steel wire) 14 disposed adjacent to the conductor strand 13 becomes the same kind of metal contact, and the conductor strand 13 and the high-strength conductor strand There is no possibility that corrosion will proceed with the (copper-coated steel wire) 14. In addition, since the high-strength conductor wire (copper-coated steel wire) 14 has a tensile strength approximately twice that of the conductor strand 13, the conductor strand 13 and the high-strength conductor strand 14 are twisted together. The stranded wire 10 in which the stranded wire layer 12 is formed can have a longer bending life than the stranded wire 100 (see FIG. 10) in which the stranded wire layer 102 is formed only by the conductor strand 103.

  The bending property of the stranded wire 10 depends greatly on the tensile strength of the high-strength conductor wire 14 itself and the ratio of the high-strength conductor wire 14 in the entire stranded wire layer 12. The percentage is low. For this reason, there is not much necessity to give great importance to the tensile strength of the conductor wire 13. Therefore, you may form the conductor strand 13 with the material (for example, pure Cu) which attached importance to the electrical conductivity. As a result, the conductor element 13 and the high-strength conductor element 14 can share the functions required of the stranded wire 10 such that the tensile strength is the high-strength conductor element 14 and the conductivity is the conductor element 13. it can. For this reason, while using the same conductor strand 13 and the high-strength conductor strand 14, the several twisted wire from which a bending characteristic and electrical conductivity differ can be produced.

  Moreover, once the material of the conductor strand was determined for the conventional stranded wire 100 shown in FIG. 10, the bending characteristics and conductivity could be adjusted only by changing the wire diameter and the number of strands. . On the other hand, the twisted wire 10 according to the present embodiment changes the ratio of the high-strength conductor element wire 14 occupying the entire twisted wire layer 12 so that the wire diameter is kept constant and the bending characteristics and conductivity are kept constant. Can be adjusted freely.

  In the stranded wire 10 according to the present embodiment, the arrangement of the conductor wires 13 and the high-strength conductor wires 14 in the stranded wire layer 12 is random, and the arrangement positions thereof are arbitrary. It is easy to form and simplifies the cable manufacturing process. As a result, the stranded wire 10 can be manufactured at low cost.

  Next, another embodiment of the present invention will be described with reference to the accompanying drawings.

(Second Embodiment)
A cross-sectional view of a stranded wire according to another preferred embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the member similar to FIG. 1, and description is abbreviate | omitted about these members.

  In the stranded wire 10 shown in FIG. 1, the arrangement of the conductor wires 13 and the high-strength conductor wires 14 in the stranded wire layer 12 is random.

  On the other hand, as shown in FIG. 4, the stranded wire 40 according to the present embodiment has the same basic structure as the stranded wire 10 shown in FIG. Is different. Specifically, in the stranded wire layer 42, the layer 42b immediately below the outermost layer 42c is composed of the high-strength conductor strand 14, and the layers excluding the layer 42b (layers 42a and 42c in FIG. 4) are conductor strands. 13.

  Here, at least a part of the center conductor 11 may be composed of the high-strength conductor wire 14. In other words, the central conductor 11 may be formed by a bundled wire in which the conductor wire 13 and the high-strength conductor wire 14 are mixed.

  What provided the insulating coating layer 15 in the outer periphery of this twisted wire 40 becomes a bending-resistant cable. Also in the stranded wire 40 and the bending resistant cable according to the present embodiment, the same effects as the stranded wire 10 and the bending resistant cable according to the first embodiment can be obtained.

  Furthermore, in the stranded wire 40 according to the present embodiment, the layer 42 b immediately below the outermost layer 42 c of the stranded wire layer 42 is constituted by the high-strength conductor wire 14. Generally, when a cable is bent, the cable is distorted, but the maximum distortion is generated in the outermost layer of the cable. Therefore, the disconnection of the cable proceeds from the cable outer layer toward the inner layer side. Since the stranded wire 40 needs to arrange the high-strength conductor wire 14 only in the layer 42b in the stranded wire layer 42, compared to the stranded wire 10 shown in FIG. The process is a little complicated. However, in the stranded wire 40, by forming the layer 42b immediately below the outermost layer 42c with the high-strength conductor element wire 14, the progress of disconnection from the cable outer layer toward the inner layer side can be stopped by the layer 42b. As a result, it is possible to extend the life of the stranded wire 40 (improve the bending property). Moreover, since all the layers except the layer 42b in the stranded wire layer 42 in the stranded wire 40 are composed of the conductor wires 13, sufficient conductivity can be ensured.

  Further, as shown in FIG. 5 as a modification of the stranded wire 40 (gathered stranded wire) shown in FIG. 4, the stranded wire 50 is a center composed of a plurality (seven in FIG. 5) of conductor wires 13. Around the conductor 11, a plurality of (12 in FIG. 5) conductor strands 13 as the first layer 52a and a plurality (18 in FIG. 5) of high-strength conductor strands 14 as the second layer 52b. Alternatively, the third layer 52c may be a concentric stranded wire in which a plurality of conductor wires 13 (24 in FIG. 5) are twisted in layers and concentrically. That is, the first layer 52 a and the third layer 52 c configured by the conductor strand 13 and the second layer 52 b configured by the high-strength conductor strand 14 around the central conductor 11 configured by the conductor strand 13; May be a stranded wire 50 having a stranded wire layer 52 having a multilayer structure (three-layer structure in FIG. 5) formed by concentrically twisting wires. What provided the insulating coating layer 15 in the outer periphery of this twisted wire 50 becomes a bending-resistant cable.

  Examples of the combination of the conductor wire 13 and the high-strength conductor wire 14 in the stranded wires 40 and 50 as shown in FIGS. 4 and 5 described above include the following. As the conductor wire 13, a Cu-In alloy (for example, Cu-0.1 mass% In) or a Cu-Sn-In alloy (for example, Cu-0.2 mass% Sn-0.2 mass% In, Cu-0.19 mass% Sn) -0.2 mass% In) is an annealing treatment material or a full annealing treatment material. As the high-strength conductor wire 14, a Cu-In alloy (for example, Cu-0.1 mass% In) or a Cu-Sn-In alloy (for example, Cu-0.2 mass% Sn-0.2 mass% In, Cu-0.19 mass) % Sn-0.2mass% In) annealed untreated material (hard material (H material)). By performing such a combination, the flexibility of the stranded wires 40 and 50 can be improved, and the bending characteristics can also be improved.

(Third embodiment)
FIG. 6 shows a cross-sectional view of a stranded wire according to another preferred embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member similar to FIG. 1, and description is abbreviate | omitted about these members.

  In the stranded wire 40 shown in FIG. 4, the layer 42 b immediately below the outermost layer 42 c in the stranded wire layer 42 is composed of the high-strength conductor strand 14, and the layers excluding the layer 42 b are composed of the conductor strand 13. It was a thing.

  On the other hand, as shown in FIG. 6, the stranded wire 60 according to the present embodiment has the same basic structure as the stranded wire 10 shown in FIG. Is different. Specifically, in the stranded wire layer 62, all layers (the layers 62a and 62b in FIG. 6) except the outermost layer 62c are composed of the high-strength conductor wire 14, and the outermost layer 62c is the conductor wire 13. Composed.

  Here, at least a part of the center conductor 11 may be composed of the high-strength conductor wire 14. In other words, the central conductor 11 may be formed by a bundled wire in which the conductor wire 13 and the high-strength conductor wire 14 are mixed.

  What provided the insulating coating layer 15 in the outer periphery of this twisted wire 60 becomes a bending-resistant cable. Also in the stranded wire 60 and the bending resistant cable according to the present embodiment, the same effects as the stranded wire 10 and the bending resistant cable according to the first embodiment can be obtained.

  Furthermore, in the stranded wire 60 according to the present embodiment, only the outermost layer 62c of the stranded wire layer 62 is constituted by the conductor strand 13, and the other layers 62a and 62b are constituted by the high-strength conductor strand 14. ing. For this reason, compared with the twisted wire 40 shown in FIG. 4, the twisted wire 60 can aim at the further life extension (improvement of a bending characteristic) of a twisted wire. Since this stranded wire 60 has a large proportion of the high-strength conductor wire 14 in the entire stranded wire layer 62, it is difficult to obtain high electrical conductivity. For this reason, it is preferable to comprise the conductor strand 13 with pure Cu or Cu alloy with high electrical conductivity. The stranded wire 60 is suitable for a bending-resistant cable that requires a very high bending life.

  Further, as shown in FIG. 7 as a modification of the stranded wire 60 (gathered stranded wire) shown in FIG. 6, the stranded wire 70 is a center composed of a plurality of conductor wires 13 (seven in FIG. 7). Around the conductor 11, a plurality of (12 in FIG. 7) high-strength conductor wires 14 are provided as the first layer 72a, and a plurality (18 in FIG. 7) of high-strength conductor elements are provided as the second layer 72b. The wire 14 may be a concentric stranded wire formed by twisting a plurality of (24 in FIG. 7) conductor strands 13 in layers and concentrically as the third layer 72c. That is, the first layer 72 a and the second layer 72 b configured by the high-strength conductor strand 14 and the third layer 72 c configured by the conductor strand 13 around the central conductor 11 configured by the conductor strand 13 and May be a stranded wire 70 having a stranded wire layer 72 having a multilayer structure (three-layer structure in FIG. 7) formed by concentrically twisting wires. What provided the insulating coating layer 15 in the outer periphery of this twisted wire 70 becomes a bending-resistant cable.

In addition, as a combination of the conductor strand 13 and the high-strength conductor strand 14 in the twisted wires 60 and 70 as shown in FIG. 6 and FIG. As the conductor wire 13, a Cu-In alloy (for example, Cu-0.1 mass% In) or a Cu-Sn-In alloy (for example, Cu-0.2 mass% Sn-0.2 mass% In, Cu-0.19 mass% Sn) -0.2 mass% In) is an annealing treatment material or a full annealing treatment material. As the high-strength conductor wire 14, Cu-In alloy (for example, Cu-0.1 mass% In) or Cu-Sn-In alloy (for example, Cu-0.2 mass% Sn-0.2 mass% In, Cu-0.19 mass) % Sn-0.2mass% In) annealed untreated material (hard material (H material)). By performing such a combination, the flexibility of the stranded wires 60 and 70 can be improved, and the bending characteristics can also be improved.
(Fourth embodiment)
FIG. 8 shows a cross-sectional view of a stranded wire according to another preferred embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member similar to FIG. 1, and description is abbreviate | omitted about these members.

  The stranded wire 40 shown in FIG. 4 and the stranded wire 60 shown in FIG. 6 are configured such that a part of the stranded wire layer is composed of the high-strength conductor wire 14.

  On the other hand, as shown in FIG. 8, the stranded wire 80 according to the present embodiment has a composite wire formed by twisting the conductor wire 13 around the central conductor 11 constituted by the high-strength conductor wire 14. The stranded wire layer 82 has a layer structure (three-layer structure in FIG. 8). Here, the stranded wire 80 is a collective stranded wire, and includes a central conductor 11 composed of a plurality of (seven in FIG. 8) high-strength conductor wires 14 and a plurality (54 in FIG. 8) of conductor elements. The wires 13 are twisted together.

  What provided the insulating coating layer 15 in the outer periphery of this twisted wire 80 becomes a bending-resistant cable. Also in the stranded wire 80 and the bending resistant cable according to the present embodiment, the same effects as the stranded wire 10 and the bending resistant cable according to the first embodiment can be obtained.

  Furthermore, in the stranded wire 80 according to the present embodiment, the central conductor 11 is composed of the high-strength conductor strand 14, and the stranded wire layer 82 is composed of the conductor strand 13. From the perspective of the layer of the strength conductor wire 14, it has a two-layer structure. On the other hand, the stranded wire 40 shown in FIG. 4 and the stranded wire 60 shown in FIG. 6 have a three-layer structure in terms of the layer of the conductor strand 13 and the layer of the high-strength conductor strand 14. . Therefore, the stranded wire 80 according to the present embodiment has a simple layer structure as compared with the stranded wire 40 and the stranded wire 60, so that the twisting is easy and the cable manufacturing process is simplified. As a result, the stranded wire 80 has substantially the same conductivity as the stranded wire 100 shown in FIG. 10, has a longer bending life than the stranded wire 100, and is less expensive to manufacture than the stranded wire 40 and the stranded wire 60. It will be cheap.

  Further, as shown in FIG. 9 as a modification of the stranded wire 80 (gathered stranded wire) shown in FIG. 8, the stranded wire 90 includes a plurality of (seven in FIG. 9) high-strength conductor wires 14. Around the central conductor 11, a plurality of (12 in FIG. 9) conductor wires 13 are formed as the first layer 92a, and a plurality (18 in FIG. 9) of conductor wires 13 are formed as the second layer 92b. The third layer 92c may be a concentric stranded wire formed by twisting a plurality of conductor wires 13 (24 in FIG. 9) in layers and concentrically. That is, the first layer 92a, the second layer 92b, and the third layer 92c made of the conductor wire 13 are twisted concentrically around the central conductor 11 made of the high-strength conductor wire 14. A stranded wire 90 having a stranded wire layer 92 having a multilayer structure (three-layer structure in FIG. 9) may be used. What provided the insulating coating layer 15 in the outer periphery of this twisted wire 90 becomes a bending-resistant cable.

  As described above, the present invention is not limited to the above-described embodiment, and it goes without saying that various other things are assumed.

  Next, although this invention is demonstrated based on an Example, this invention is not limited to these Examples.

  Fig. 4 shows a TPC wire with a wire diameter of 0.1 mm and a tensile strength of 220 MPa as the conductor wire, and a Cu-0.1 mass% In wire with a wire diameter of 0.1 mm and a tensile strength of 300 MPa as the high-strength conductor wire. An assembled stranded wire having the above structure was prepared (Sample 11).

  TPC wire with 0.1 mm diameter and 220 MPa tensile strength is used as the conductor wire, and Cu-0.2 mass% Sn-0.2 mass% In wire with 0.1 mm diameter and 300 MPa tensile strength is used as the high-strength conductor wire. The assembly strand wire of the structure shown in FIG. 4 was produced (sample 12).

  Using a TPC wire having a wire diameter of 0.1 mm and a tensile strength of 220 MPa as a conductor wire, an assembled stranded wire having the structure shown in FIG. 10 was prepared (Sample 13).

  The bending properties of each of the assembled strands of Samples 11 to 13 obtained were evaluated. The bending characteristics were evaluated based on the length of the bending life. The term “bending life” as used herein refers to the number of bendings when at least one of the strands constituting the collective stranded wire is disconnected when the collective stranded wire is repeatedly bent at a specific strain ratio.

  The bending life of the collective stranded wire in the sample 13 was 500,000 times, whereas the bending life of each collective stranded wire in the samples 11 and 12 was 700,000 times. That is, it was confirmed that the bending properties of the samples 11 and 12 which are the stranded wires of the present invention are improved by 1.4 times compared to the sample 13 which is a conventional stranded wire.

  A TPC wire with a wire diameter of 0.1 mm and a tensile strength of 220 MPa is used as the conductor wire, and a Cu-0.1 mass% In wire with a wire diameter of 0.1 mm and a tensile strength of 300 MPa is used as the high-strength conductor wire as shown in FIG. An assembled stranded wire having the above structure was prepared (Sample 21).

  TPC wire with 0.1 mm diameter and 220 MPa tensile strength is used as the conductor wire, and Cu-0.2 mass% Sn-0.2 mass% In wire with 0.1 mm diameter and 300 MPa tensile strength is used as the high-strength conductor wire. The assembly strand wire of the structure shown in FIG. 8 was produced (sample 22).

  The bending characteristics of each of the assembled strands of the obtained samples 21 and 22 and the assembled strand of the sample 13 of [Example 1] were evaluated.

  The bending life of the collective stranded wire in Sample 13 was 500,000 times, whereas the bending life of each of the collective stranded wires in Samples 21 and 22 was 650,000. That is, it was confirmed that the bending characteristics of Samples 21 and 22 which are the stranded wires of the present invention were improved 1.3 times compared to Sample 13 which was a conventional stranded wire.

It is a cross-sectional view of a stranded wire according to a preferred embodiment of the present invention. It is an expanded sectional view of the high intensity | strength conductor strand in FIG. It is a modification of FIG. It is a cross-sectional view of a stranded wire according to another preferred embodiment of the present invention. It is a modification of FIG. It is a cross-sectional view of a stranded wire according to another preferred embodiment of the present invention. It is a modification of FIG. It is a cross-sectional view of a stranded wire according to still another preferred embodiment of the present invention. It is a modification of FIG. It is a cross-sectional view showing an example of a conventional cable. It is a cross-sectional view which shows the other example of the conventional cable.

10 Stranded wire 11 Central conductor 12 Stranded wire layer 13 Conductor strand 14 High-strength conductor strand

Claims (7)

In the stranded wire having a stranded wire layer formed by twisting the conductor wire around the central conductor, the conductor wire and the high-strength conductor wire having a higher tensile strength than the conductor wire are twisted together, The stranded wire in which the stranded wire layer is formed , wherein the conductor strand is an annealing treatment material or a full annealing treatment material of a Cu-In alloy or a Cu-Sn-In alloy, and the high-strength conductor strand is A stranded wire comprising an annealed untreated material of Cu-In alloy or Cu-Sn-In alloy . The twisted wire according to claim 1, wherein a layer immediately below the outermost layer of the twisted wire layers is composed of the high-strength conductor strand. All the layers except the outermost layer of the said strand wire layer are the twisted wires of Claim 1 or 2 comprised with the said high intensity | strength conductor strand. The stranded wire according to any one of claims 1 to 3 , wherein at least a part of the central conductor is composed of the high-strength conductor wire. The stranded wire according to any one of claims 1 to 4 , wherein the high-strength conductor strand is made of one type of wire. The stranded wire according to any one of claims 1 to 5 , wherein the high-strength conductor strand includes at least two types of wires having different tensile strengths. A bending-resistant cable, wherein an insulating coating layer is provided around the stranded wire according to any one of claims 1 to 6 .

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