Insulated wire

Abstract

To provide an insulated wire capable of ensuring insulation and improving flexibility.SOLUTION: An insulated wire 1 includes a conductor portion 10 consisting of twisted wires and an insulating portion 20 provided on the outer periphery of the conductor portion 10. The insulating portion 20 consists of a plurality of resin strings 21 made of the same material that are integrated in a twisted state. Each resin string 21 is joined to the adjacent resin strings 21 with a specific contact width smaller than the string diameter when viewed in cross section. The twist pitch of the plurality of resin strings 21 is set to 20x or more, where x is the outer diameter of the conductor portion 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to insulated wires. [Background technology]

[0002] In recent years, with the electrification of vehicles, for example, the voltage and current of electric wires have been increasing. The increased current has led to larger wire diameters, which in turn has resulted in reduced wire flexibility. To address this problem, a method has been proposed in which the conductor portion of the electric wire is constructed using stranded wire (see Patent Documents 1 and 2).

[0003] Furthermore, a technology has been proposed in which the insulating portion is constructed from multiple fibers (see Patent Document 3). In this technology, some of the multiple fibers are made from fibers with a low melting point, and when heated, these fibers melt and then solidify when cooled, thereby forming the insulating portion. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-7107 [Patent Document 2] Japanese Patent Publication No. 2018-145457 [Patent Document 3] Japanese Patent Publication No. 2018-125988 [Overview of the project] [Problems that the invention aims to solve]

[0005] In the case of the insulated electric wires described in Patent Documents 1 and 2, since the conductor portion is made of stranded wire, flexibility can be improved compared to the case where the conductor portion is made of a single solid wire. However, simply making the conductor portion of stranded wire was not sufficient to improve flexibility.

[0006] Therefore, it is conceivable to construct the insulating part with fibers, as described in Patent Document 3. However, in the method described in Patent Document 3, some of the multiple fibers are made of fibers with a low melting point. As a result, the bonding between fibers becomes stronger near the fibers with a low melting point, but the bonding between fibers tends to be weaker farther away from the fibers with a low melting point. Consequently, when looking at the entire wire, the degree of bonding between fibers becomes sparse, and when bending or external force is applied, gaps may form between fibers at the weakly bonded points, potentially causing problems with insulation.

[0007] This invention was made to solve these conventional problems, and its objective is to provide an insulated wire that can ensure insulation and improve flexibility. [Means for solving the problem]

[0008] The insulated electric wire according to the present invention comprises a conductor portion made of stranded wire and the outer circumference of the conductor portion directly An insulated electric wire having an insulating section, wherein the insulating section is composed of multiple resin cords made of the same material and integrated in a twisted state, and the distance between each resin cord and adjacent resin cords is smaller than the diameter of the cord when viewed in cross-section. Ensure a breakdown voltage of 5kV They are joined with a specific contact width. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an insulated wire that can be made more flexible. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view showing an insulated wire according to an embodiment of the present invention. [Figure 2] This is an end view of the configuration shown in Figure 1. [Figure 3] This is a partially enlarged view of Figure 2. [Figure 4] This graph shows the relationship between the thickness of various insulating materials and their breakdown voltage. [Figure 5]It is a diagram showing an example of an insulated wire with a thick-walled insulating portion, showing an example of a thick-walled insulated wire using a resin cord having a relatively large cord diameter. [Figure 6] It is a diagram showing an example of an insulated wire with a thin-walled insulating portion, showing an example of a thin-walled insulated wire using a resin cord having a relatively small cord diameter. [Figure 7] It is a cross-sectional view showing a modified example of a resin cord. MODE FOR CARRYING OUT THE INVENTION

[0011] Hereinafter, the present invention will be described based on preferred embodiments. Note that the present invention is not limited to the embodiments shown below, and can be appropriately modified without departing from the scope of the gist of the present invention. In addition, in the embodiments described below, some configurations are omitted from illustration and explanation, but it goes without saying that publicly known or well-known techniques are appropriately applied to the details of the omitted techniques within a scope that does not conflict with the content described below.

[0012] FIG. 1 is a perspective view showing an insulated wire 1 according to an embodiment of the present invention, and FIG. 2 is an end view of the configuration shown in FIG. 1. As shown in FIG. 1, the insulated wire 1 according to the present embodiment is configured to include a conductor portion 10 and an insulating portion 20.

[0013] The conductor portion 10 is formed of a stranded wire formed by twisting conductive element wires 11. In the present embodiment, the stranded wire is constituted by 19 element wires 11. Note that the number of element wires 11 can be appropriately changed.

[0014] The insulating portion 20 is provided on the outer circumference of the conductor portion 10. The insulating portion 20 is composed of a plurality of resin cords 21 made of an insulating material. The plurality of resin cords 21 are twisted together and integrated with each other on the outer circumference of the conductor portion 10 to form an insulating layer. The plurality of resin cords 21 are integrated by welding or by an adhesive or tack. When integration is performed by an adhesive or tack, it is preferable to use an adhesive or tack with an insulating resistance equal to or greater than that of the resin cords 21. Furthermore, it is preferable to use an adhesive or tack with a Young's modulus equal to or less than that of the resin cords 21.

[0015] Furthermore, the multiple resin cords 21 are made of the same material. In other words, the configuration ensures that no part of the multiple resin cords 21 is made of a different material from the others.

[0016] As shown in Figure 2, the insulating portion 20 is provided directly on the outer circumference of the conductor portion 10 without any intervening material between it and the conductor portion 10. In Figure 2, the insulating portion 20 is provided on the conductor portion 10 in a single-layer structure, but it is not limited to this and may be provided in two or more layers.

[0017] Figure 3 is a magnified view of a portion of Figure 2. As shown in Figure 3, each resin cord 21 is joined to an adjacent resin cord 21 with a predetermined contact width W when viewed in cross-section. This contact width W is smaller than the cord diameter D of the resin cord 21.

[0018] In this manner, the insulating section 20, which is composed of multiple resin cords 21, is joined to adjacent resin cords 21 at a contact width W. Therefore, each resin cord 21 is not joined except at the contact width W portion, and when the insulated wire 1 is bent, it bends flexibly using the unjointed portions.

[0019] Furthermore, as mentioned above, the multiple resin cords 21 are made of the same material. Therefore, the degree of bonding between adjacent resin cords 21 tends to be uniform. This makes it less likely that areas with strong and weak bonding will coexist, reducing the possibility of the bonding being too strong and impairing flexibility, or the bonding being too weak and causing gaps to form between specific resin cords 21 when bending, etc.

[0020] In addition, the contact width W is set to ensure a breakdown voltage of a predetermined value (e.g., 5kV) or higher. Figure 4 is a graph showing the relationship between the thickness of various insulating materials and the breakdown voltage. As shown in Figure 4, when the insulator is made of polyvinyl chloride or silicone rubber, the thickness of the insulator must be 0.2 mm or more in order to ensure a breakdown voltage of 5kV or higher. Therefore, when the insulating part 20 (multiple resin strings 21) according to this embodiment is made of polyvinyl chloride or silicone rubber, the contact width W is set to 0.2 mm or more in order to ensure a breakdown voltage of 5kV. Similarly, when the insulator is made of cross-linked polyethylene or polypropylene, the thickness of the insulator must be 0.125 mm or more in order to ensure a breakdown voltage of 5kV or higher. Therefore, when the insulating part 20 (multiple resin strings 21) according to this embodiment is made of cross-linked polyethylene or polypropylene, the contact width W is set to 0.125 mm or more in order to ensure a breakdown voltage of 5kV.

[0021] Figure 5 is a diagram showing an example of an insulated wire 1 with a thickened insulating section 20, and shows an example of an insulated wire 1 with a thickened specification using a resin cord 21 with a relatively large cord diameter D.

[0022] As shown in Figure 5, first the size (cross-sectional area) of the conductor part 10 is 10 mm 2When the outer diameter x is 4.50 mm, the resin cord 21 has a cord diameter D of 1.00 mm or more and 1.20 mm or less, and the number of strands is 15 or more and 18 or less. In this case, the twist pitch of the multiple resin cords 21 is 20x or more and 20(x+2D) or less. This is because setting the twist pitch to 20x or more makes it easier to ensure flexibility without the twist pitch becoming too tight. Also, setting the twist pitch to 20(x+2D) or less makes it easier to prevent the twist pitch from becoming too loose, thus preventing insufficient joining of the resin cords 21 during welding or bonding. Specifically, the twist pitch of the multiple resin cords 21 is 90 mm (= 20 × 4.50) or more and 138 mm (= 20 × (4.50 + 2 × 1.20)) or less.

[0023] Furthermore, the size (cross-sectional area) of the conductor part 10 is 12 mm 2 When the outer diameter x is 5.40 mm, the resin cord 21 has a cord diameter D of 1.00 mm or more and 1.20 mm or less, and consists of 21 strands. In this case, the twist pitch of the multiple resin cords 21 is 108 mm (= 20 × 5.40) or more and 156 mm (= 20 × (5.40 + 2 × 1.20)) or less.

[0024] Furthermore, the size (cross-sectional area) of the conductor part 10 is 16 mm 2 When the outer diameter x is 5.80 mm, the resin cord 21 has a cord diameter D of 1.00 mm or more and 1.20 mm or less, and consists of 22 strands. In this case, the twist pitch of the multiple resin cords 21 is 116 mm (= 20 × 5.80) or more and 164 mm (= 20 × (5.80 + 2 × 1.20)) or less.

[0025] Furthermore, the size (cross-sectional area) of the conductor part 10 is 20 mm 2 When the outer diameter x is 6.90 mm, the resin cord 21 has a cord diameter D of 1.10 mm or more and 1.32 mm or less, and consists of 23 strands. In this case, the twist pitch of the multiple resin cords 21 is 138 mm (= 20 × 6.90) or more and 191 mm (≒ 20 × (6.90 + 2 × 1.32)) or less.

[0026] Furthermore, the size (cross-sectional area) of the conductor part 10 is 25 mm2 When the outer diameter x is 7.20 mm, the resin cords 21 have a cord diameter D of 1.30 mm or more and 1.56 mm or less, and the number of the resin cords is 21. In this case, the twisting pitch of the plurality of resin cords 21 is 144 mm (=20×7.20) or more and 206 mm (≒20×(7.20+2×1.56)) or less.

[0027] Further, when the size (cross-sectional area) of the conductor portion 10 is 30 mm 2 and the outer diameter x is 8.30 mm, the resin cords 21 have a cord diameter D of 1.30 mm or more and 1.56 mm or less, and the number of the resin cords is 23 or more and 24 or less. In this case, the twisting pitch of the plurality of resin cords 21 is 166 mm (=20×8.30) or more and 228 mm (≒20×(8.30+2×1.56)) or less.

[0028] Further, when the size (cross-sectional area) of the conductor portion 10 is 35 mm 2 and the outer diameter x is 8.50 mm, the resin cords 21 have a cord diameter D of 1.30 mm or more and 1.56 mm or less, and the number of the resin cords is 24. In this case, the twisting pitch of the plurality of resin cords 21 is 170 mm (=20×8.50) or more and 232 mm (≒20×(8.50+2×1.56)) or less.

[0029] Further, when the size (cross-sectional area) of the conductor portion 10 is 40 mm 2 and the outer diameter x is 9.60 mm, the resin cords 21 have a cord diameter D of 1.40 mm or more and 1.68 mm or less, and the number of the resin cords is 25. In this case, the twisting pitch of the plurality of resin cords 21 is 192 mm (=20×9.60) or more and 259 mm (≒20×(9.60+2×1.68)) or less.

[0030] Further, when the size (cross-sectional area) of the conductor portion 10 is 50 mm 2 and the outer diameter x is 10.50 mm, the resin cords 21 have a cord diameter D of 1.50 mm or more and 1.80 mm or less, and the number of the resin cords is 25 or more and 26 or less. In this case, the twisting pitch of the plurality of resin cords 21 is 210 mm (=20×10.50) or more and 282 mm (=20×(10.50+2×1.80)) or less.

[0031] Furthermore, the size (cross-sectional area) of the conductor part 10 is 60 mm². 2 When the outer diameter x is 11.60 mm, the resin cord 21 has a cord diameter D of 1.50 mm or more and 1.80 mm or less, and the number of strands is 27 or more and 28 or less. In this case, the twist pitch of the multiple resin cords 21 is 232 mm (= 20 × 11.60) or more and 304 mm (= 20 × (11.60 + 2 × 1.80)) or less.

[0032] Furthermore, the size (cross-sectional area) of the conductor part 10 is 70 mm². 2 When the outer diameter x is 12.50 mm, the resin cord 21 has a cord diameter D of 1.50 mm or more and 1.80 mm or less, and the number of strands is 29 or more and 30 or less. In this case, the twist pitch of the multiple resin cords 21 is 250 mm (= 20 × 12.50) or more and 322 mm (= 20 × (12.50 + 2 × 1.80)) or less.

[0033] Furthermore, the size (cross-sectional area) of the conductor part 10 is 95 mm². 2 When the outer diameter x is 14.80 mm, the resin cord 21 has a cord diameter D of 1.60 mm or more and 1.92 mm or less, and the number of strands is 31 or more and 33 or less. In this case, the twist pitch of the multiple resin cords 21 is 296 mm (= 20 × 14.80) or more and 373 mm (≒ 20 × (14.80 + 2 × 1.92)) or less.

[0034] Furthermore, the size (cross-sectional area) of the conductor part 10 is 120 mm². 2 When the outer diameter x is 16.50 mm, the resin cord 21 has a cord diameter D of 1.60 mm or more and 1.92 mm or less, and the number of strands is 34 or more and 36 or less. In this case, the twist pitch of the multiple resin cords 21 is 330 mm (= 20 × 16.50) or more and 407 mm (≒ 20 × (16.50 + 2 × 1.92)) or less.

[0035] Figure 6 is a diagram showing an example of an insulated wire 1 with a thin insulating section 20, and shows an example of an insulated wire 1 with a thin specification using a resin cord 21 with a relatively small cord diameter D.

[0036] As shown in Figure 6, first the size (cross-sectional area) of the conductor part 10 is 10 mm 2 When the outer diameter x is 4.50 mm, the resin cord 21 has a cord diameter D of 0.75 mm or more and 0.90 mm or less, and the number of strands is 19 or more and 22 or less. In this case as well, the twist pitch of the multiple resin cords 21 is 20x or more and 20(x+2D) or less. That is, the twist pitch of the multiple resin cords 21 is 90 mm (= 20 × 4.50) or more and 126 mm (= 20 × (4.50 + 2 × 0.90)) or less.

[0037] Furthermore, the size (cross-sectional area) of the conductor part 10 is 12 mm 2 When the outer diameter x is 5.40 mm, the resin cord 21 has a cord diameter D of 0.55 mm or more and 0.66 mm or less, and the number of strands is 32 or more and 34 or less. In this case, the twist pitch of the multiple resin cords 21 is 108 mm (= 20 × 5.40) or more and 134 mm (≒ 20 × (5.40 + 2 × 0.66)) or less.

[0038] Furthermore, the size (cross-sectional area) of the conductor part 10 is 16 mm 2 When the outer diameter x is 5.80 mm, the resin cord 21 has a cord diameter D of 0.70 mm or more and 0.84 mm or less, and the number of strands is 28 or more and 30 or less. In this case, the twist pitch of the multiple resin cords 21 is 116 mm (= 20 × 5.80) or more and 150 mm (≒ 20 × (5.80 + 2 × 0.84)) or less.

[0039] Furthermore, the size (cross-sectional area) of the conductor part 10 is 20 mm 2 When the outer diameter x is 6.90 mm, the resin cord 21 has a cord diameter D of 0.45 mm or more and 0.54 mm or less, and the number of strands is 47 or more and 52 or less. In this case, the twist pitch of the multiple resin cords 21 is 138 mm (= 20 × 6.90) or more and 160 mm (≒ 20 × (6.90 + 2 × 0.54)) or less.

[0040] Furthermore, the size (cross-sectional area) of the conductor part 10 is 25 mm 2When the outer diameter x is 7.20 mm, the resin cord 21 has a cord diameter D of 0.75 mm or more and 0.90 mm or less, and the number of strands is 32 or more and 34 or less. In this case, the twist pitch of the multiple resin cords 21 is 144 mm (= 20 × 7.20) or more and 180 mm (= 20 × (7.20 + 2 × 0.90)) or less.

[0041] Furthermore, the size (cross-sectional area) of the conductor part 10 is 30 mm 2 When the outer diameter x is 8.30 mm, the resin cord 21 has a cord diameter D of 0.65 mm or more and 0.78 mm or less, and the number of strands is 40 or more and 44 or less. In this case, the twist pitch of the multiple resin cords 21 is 166 mm (= 20 × 8.30) or more and 197 mm (≒ 20 × (8.30 + 2 × 0.78)) or less.

[0042] Furthermore, the size (cross-sectional area) of the conductor part 10 is 35 mm 2 When the outer diameter x is 8.50 mm, the resin cord 21 has a cord diameter D of 0.95 mm or more and 1.14 mm or less, and the number of strands is 30 or more and 32 or less. In this case, the twist pitch of the multiple resin cords 21 is 170 mm (= 20 × 8.50) or more and 216 mm (≒ 20 × (8.50 + 2 × 1.14)) or less.

[0043] Furthermore, the size (cross-sectional area) of the conductor part 10 is 40 mm 2 When the outer diameter x is 9.60 mm, the resin cord 21 has a cord diameter D of 0.75 mm or more and 0.90 mm or less, and the number of strands is 40 or more and 44 or less. In this case, the twist pitch of the multiple resin cords 21 is 192 mm (= 20 × 9.60) or more and 228 mm (= 20 × (9.60 + 2 × 0.90)) or less.

[0044] Furthermore, the size (cross-sectional area) of the conductor part 10 is 50 mm 2 When the outer diameter x is 10.50 mm, the resin cord 21 has a cord diameter D of 0.85 mm or more and 1.02 mm or less, and the number of strands is 39 or more and 42 or less. In this case, the twist pitch of the multiple resin cords 21 is 210 mm (= 20 × 10.50) or more and 251 mm (≒ 20 × (10.50 + 2 × 1.02)) or less.

[0045] Furthermore, the size (cross-sectional area) of the conductor part 10 is 60 mm². 2 When the outer diameter x is 11.60 mm, the resin cord 21 has a cord diameter D of 0.85 mm or more and 1.02 mm or less, and the number of strands is 43 or more and 47 or less. In this case, the twist pitch of the multiple resin cords 21 is 232 mm (= 20 × 11.60) or more and 273 mm (≒ 20 × (11.60 + 2 × 1.02)) or less.

[0046] Furthermore, the size (cross-sectional area) of the conductor part 10 is 70 mm². 2 When the outer diameter x is 12.50 mm, the resin cord 21 has a cord diameter D of 0.95 mm or more and 1.14 mm or less, and the number of strands is 41 or more and 45 or less. In this case, the twist pitch of the multiple resin cords 21 is 250 mm (= 20 × 12.50) or more and 296 mm (≒ 20 × (12.50 + 2 × 1.14)) or less.

[0047] Furthermore, the size (cross-sectional area) of the conductor part 10 is 95 mm². 2 When the outer diameter x is 14.80 mm, the resin cord 21 has a cord diameter D of 0.95 mm or more and 1.14 mm or less, and the number of strands is 48 or more and 53 or less. In this case, the twist pitch of the multiple resin cords 21 is 296 mm (= 20 × 14.80) or more and 342 mm (≒ 20 × (14.80 + 2 × 1.14)) or less.

[0048] The twisting direction of the multiple resin cords 21 may be the same as or different from the twisting direction of the strands 11 of the conductor section 10, but considering the flexibility of the insulated wire 1, it is preferable that it be the same as the twisting direction of the strands 11 of the conductor section 10.

[0049] Next, the manufacturing method of the insulated wire 1 according to this embodiment will be described. First, in manufacturing the insulated wire 1 according to this embodiment, a plurality of strands 11 are twisted together. This forms a conductor portion 10. Next, a plurality of resin cords 21 are twisted together on the conductor portion 10. At this time, for example, the plurality of resin cords 21 are twisted together in the same direction as the twisting direction of the strands 11.

[0050] Subsequently, the resin cords 21 are joined together. In this process, for example, multiple resin cords 21 are heated above their melting point. Alternatively, an adhesive or sealant is interposed between multiple resin cords 21. In the case of adhesive, it is injected and applied between each resin cord 21 using an injector with a tapered tip. As a result, multiple resin cords 21 are integrated with each other, and an insulated wire 1 is manufactured. It is preferable that the adhesive or sealant used here has an insulation resistance equal to or greater than that of the resin cords 21, and a Young's modulus equal to or less than that of the resin cords 21.

[0051] In this manner, according to the insulated wire 1 of this embodiment, the insulating portion 20 is composed of multiple resin cords 21 that are twisted together and integrated, and each resin cord 21 and adjacent resin cords 21 are integrated with a specific contact width W that is smaller than the cord diameter D when viewed in cross-section. Therefore, although adjacent resin cords 21 are joined to each other with a specific contact width W, they are not joined in areas other than the contact width W, and when bent, they bend flexibly using the unjointed areas. In addition, since the multiple resin cords 21 are made of the same material, the degree of joining between adjacent resin cords 21 tends to be uniform. As a result, areas with strong and weak joining are less likely to coexist, and the possibility of flexibility being impaired due to joining being too strong, or gaps occurring between specific resin cords 21 when bending due to joining being too weak, is reduced. Thus, both insulation and flexibility can be improved.

[0052] Furthermore, when multiple resin cords 21 are integrated with an adhesive or adhesive, the adhesive or adhesive used has an insulation resistance greater than or equal to that of the resin cords 21. Therefore, even if adjacent resin cords 21 separate when the insulated wire 1 is bent, insulation can be ensured as long as the adhesive or adhesive is present in the separated region. Consequently, it becomes even easier to ensure insulation.

[0053] Furthermore, when multiple resin cords 21 are integrated with an adhesive or bonding agent, the adhesive or bonding agent used has a Young's modulus less than or equal to that of the resin cords 21. Therefore, flexibility is less likely to be impaired by the adhesive or bonding agent.

[0054] Furthermore, if the outer diameter of the conductor section 10 is x, the twist pitch of the multiple resin cords 21 is set to 20x or more. This prevents situations where the twist pitch is too tight and compromises flexibility.

[0055] Although the present invention has been described above based on embodiments, the present invention is not limited to the above embodiments, and modifications may be made without departing from the spirit of the invention, and if possible, publicly known or well-known technologies may be combined.

[0056] Figure 7 is a cross-sectional view showing a modified example of the resin cord. As shown in Figure 7, the resin cord 22 may have a two-layer structure, comprising an inner layer 22a that is on the central side of the resin cord 22, and an outer layer (outermost layer) 22b that covers the inner layer 22a. Here, the inner layer 22a is made of a resin that is more flexible than the outer layer 22b. The outer layer 22b is made of a resin with a lower melting point than the inner layer 22a. When multiple resin cords 22 are integrated using such a resin cord 22, welding is performed so that the insulating part 20 can be easily integrated between adjacent resin cords 22 by the outer layer 22b, and the flexibility is improved by the inner layer 22a. Therefore, it is possible to improve flexibility and achieve good integration of the insulating part 20 by welding.

[0057] In the example shown in Figure 7, the resin cord 22 has a two-layer structure, but it may also have a three-layer or more structure. [Explanation of Symbols]

[0058] 1: Insulated wire 10: Conductor part 11: Strand wire 20: Insulation part 21,22: Resin cord 22a: Inner layer 22b: Outer layer (outermost layer) D: String diameter W: Contact width x :Outer diameter

Claims

1. An insulated electric wire comprising a conductor portion made of stranded wire and an insulating portion directly provided on the outer circumference of the conductor portion, The aforementioned insulating section is composed of multiple resin cords made of the same material that are twisted together and integrated. Each resin cord is joined to an adjacent resin cord with a specific contact width that is smaller than the cord diameter when viewed in cross-section, ensuring a breakdown voltage of 5 kV. An insulated electric wire characterized by the following features.

2. The insulating part is formed by welding together the multiple resin cords. Each of the aforementioned multiple resin cords has an inner layer that forms the center and an outermost layer that covers the inner layer. The inner layer is made of a resin that is more flexible than the outermost layer, and the outermost layer is made of a resin with a lower melting point than the inner layer. The insulated wire according to feature 1.

3. The insulating portion is formed by integrating the plurality of resin strings with an adhesive or bonding agent having an insulating resistance greater than or equal to that of the plurality of resin strings. The insulated wire according to feature 1.

4. The insulating portion is formed by integrating the plurality of resin cords with an adhesive or bonding agent having a Young's modulus less than or equal to that of the plurality of resin cords. The insulated wire according to feature 1.

5. When the outer diameter of the conductor is x, the twist pitch of the multiple resin strings is 20x or more. The insulated wire according to feature 1.

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