Electric wires and cables

Abstract

To provide electric wires and cables that reduce the amount of copper used and have a small diameter. [Solution] An electric wire 1 comprising a conductor 2 and an insulator 3 surrounding the conductor 2, wherein the conductor 2 has an inner conductor portion 2a made of aluminum or an aluminum alloy and an outer conductor portion 2b made of copper or a copper alloy, the ratio of the cross-sectional area of ​​the inner conductor portion to the cross-sectional area of ​​the outer conductor portion is 40 / 60 or more and 60 / 40 or less, a tape member made of a first metal made of aluminum or an aluminum alloy and a second metal made of copper or a copper alloy is provided between the inner conductor portion and the outer conductor portion, the tape member is arranged such that the inner conductor portion 2a and the first metal face each other and the outer conductor portion 2b and the second metal face each other, and the outer diameter of the conductor 2 is reduced to the outer diameter of a conductor using only copper.

Description

[Technical Field]

[0001] This invention relates to electric wires and cables. [Background technology]

[0002] Conventionally, insulated wires comprising a conductor and an insulator covering the conductor have been widely used. Patent Document 1 proposes a wire using a metal-coated wire as the conductor, comprising a core made of aluminum or an aluminum alloy and a metal layer made of copper or a copper alloy covering the outer circumference of the core. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2018-56101 [Overview of the project] [Problems that the invention aims to solve]

[0004] In recent years, the movement towards decarbonization has accelerated, and the global demand for copper as a decarbonized resource has increased, causing copper prices to skyrocket. For example, the price of copper is more than four times that of aluminum. Therefore, in electric wires in which an insulator is coated around a conductor made of copper wire or copper alloy wire, it is desirable to reduce the amount of copper used in the conductor while considering its impact on conductor resistance. In addition, it is desirable to make the outer diameter of the conductor as small as possible in order to improve handling during wiring (ease of wiring) and to bend and compactly bundle the wires during delivery.

[0005] Therefore, the present invention aims to provide electric wires and cables that can reduce the amount of copper used and have a small diameter. [Means for solving the problem]

[0006] The present invention aims to solve the above problems and provides an electric wire comprising a conductor and an insulator covering the conductor, wherein the conductor has an inner conductor portion made of aluminum or an aluminum alloy and an outer conductor portion made of copper or a copper alloy, the ratio of the cross-sectional area of ​​the inner conductor portion to the cross-sectional area of ​​the outer conductor portion is 40 / 60 or more and 60 / 40 or less, a tape member is provided between the inner conductor portion and the outer conductor portion, the tape member is arranged such that the inner conductor portion and the first metal face each other and the outer conductor portion and the second metal face each other, and the outer diameter of the conductor is reduced to the outer diameter of a conductor made of copper only.

[0007] Furthermore, the present invention aims to solve the above problems by providing a cable comprising a cable core containing a plurality of electric wires and a sheath provided to cover the periphery of the cable core collectively. [Effects of the Invention]

[0008] According to the present invention, it is possible to reduce the amount of copper used and provide small-diameter electric wires and cables. [Brief explanation of the drawing]

[0009] [Figure 1] This is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of an electric wire according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view showing a section perpendicular to the longitudinal direction of a cable according to one embodiment of the present invention. [Modes for carrying out the invention]

[0010] [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0011] (Overall configuration of wire 1) Figure 1 is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of the electric wire 1 according to this embodiment. As shown in Figure 1, the electric wire 1 comprises a conductor 2 and an insulator 3 provided to cover the conductor 2. When the electric wire 1 is used, for example, as a power supply wire, its conductor cross-sectional area is 0.75 mm². 2 (0.75SQ) or more 350mm 2 (350SQ) or less. The electric wire 1 according to this embodiment is particularly effective in reducing the amount of copper used when its outer diameter (outer diameter of the insulator 3) is relatively large, such as 10 mm or more, and its conductor cross-sectional area is 60 mm². 2 (60SQ) or larger, more preferably 80mm 2 (80SQ) or larger. In this embodiment, the conductor cross-sectional area is approximately 100 mm². 2 (100SQ) was used. Note that the wire 1 is not limited to being used as a power supply wire, but may also be used as a signal wire for signal transmission, for example. When used as a signal wire, the outer diameter of the wire 1 is 0.8 mm or more and 2.0 mm or less, and the conductor cross-sectional area in this case is 0.10 mm². 2 (0.10SQ) or larger, 1mm 2 (1SQ) or less.

[0012] (Conductor 2) The conductor 2 has an inner conductor portion 2a located at the center of the electric wire 1 (the center of the cross-section perpendicular to the longitudinal direction), and an outer conductor portion 2b provided to cover the periphery of the inner conductor portion 2a.

[0013] The inner conductor portion 2a is constructed by twisting together multiple first strands 21, which are made by twisting together a plurality of first strands 211 made of aluminum or an aluminum alloy. Examples of aluminum alloys used as the first strands 211 include Al-Zr alloy, Al-Ni-Zr alloy, Al-Co-Zr alloy, and Al-Fe-Zr alloy. The first strands 211 may contain impurities that are unavoidable during manufacturing. The first strands 211 may also be plated with Zn (e.g., amorphous Zn), Ni, Sn, etc. on their surface. The tensile strength of the first strands 211 is 200 MPa or less, and the elongation at break is 5% to 17%. The tensile strength and elongation at break of the first strands 211 are smaller than those of the second strands 221, which will be described later. Here, the first strands 211 made of aluminum with an outer diameter of 0.45 mm were used. The outer diameter of the first strand 211 is, for example, 0.10 mm or more and 0.50 mm or less. The outer diameter of the first strand 211 is preferably the same as or smaller than the outer diameter of the second strand 221. For example, the outer diameter of the first strand 211 is preferably 90% or more and 100% or less of the outer diameter of the second strand 221. This makes it easier to reduce the amount of copper used in the conductor 2 while reducing the outer diameter of the conductor 2.

[0014] Each first stranded wire 21 constituting the inner conductor portion 2a is formed by twisting together multiple first strands 211. In other words, each first stranded wire 21 consists of a bundled strand in which multiple first strands 211 are twisted together. By forming the first stranded wire 21 by twisting together multiple first strands 211, the first strands 211 become more mobile within the first stranded wire 21, and the shape of the first stranded wire 21 becomes more easily changed by external forces. Therefore, by using forces such as those used when twisting together the second stranded wires 22 (described later), it becomes possible to reduce the gaps between the first stranded wires 21 and between the first stranded wires 21 and the second stranded wires 22 (described later), thereby reducing the outer diameter of the conductor 2. In this embodiment, the first stranded wire 21 is formed from a bundled strand in which 16 first strands 211 are twisted together. Note that the number of first strands 211 constituting the first stranded wire 21 is not limited to 16. In other words, the number of first strands 211 constituting the first stranded wire 21 may be less than 16 or more than 16. Also, in this embodiment shown in Figure 1, the number of first stranded wires 21 constituting the inner conductor portion 2a is set to 19, but this is not limited to this. The number of first stranded wires 21 constituting the inner conductor portion 2a can be appropriately changed within the range where the ratio of the number of first stranded wires 21 to the number of second stranded wires 22 (number of first stranded wires 21 / number of second stranded wires 22) is between 40 / 60 and 60 / 40. Furthermore, the outer diameter of the first stranded wire 21 is preferably the same as or smaller than the outer diameter of the second stranded wire 22, which will be described later. This makes the first stranded wire 21, which is made of aluminum or an aluminum alloy that is more easily deformed than the second stranded wire 22 made of copper or a copper alloy, more susceptible to deformation from the force received from the second stranded wire 22 side. Therefore, it becomes easier to achieve the effect of reducing the outer diameter of conductor 2 while reducing the amount of copper used in conductor 2.

[0015] The inner conductor section 2a is constructed by concentrically twisting multiple first stranded wires 21. In this embodiment, the inner conductor section 2a is constructed by concentrically twisting a total of 19 first stranded wires 21: one in the center of the electric wire 1, six around it, and twelve around those. However, the concentric twisting configuration of the inner conductor section 2a is not limited to this. For example, the inner conductor section 2a may be constructed by concentrically twisting one first stranded wire 21 in the center and six around it. Alternatively, the inner conductor section 2a may be constructed by concentrically twisting one first stranded wire 21 in the center, six around it, twelve around those, and multiple around those. By constructing the inner conductor section 2a by concentric twisting, it is possible to increase the conductor cross-sectional area while reducing the outer diameter, resulting in a smaller overall diameter for the conductor 2 and leading to a smaller overall diameter for the electric wire 1. Furthermore, the number of first stranded wires 21 used in the inner conductor portion 2a is not limited to 19. For example, the 12 first stranded wires 21 in the outermost layer may be omitted, resulting in 7 wires, or an additional 18 first stranded wires 21 may be added to the outermost layer, resulting in 37 wires.

[0016] The outer conductor portion 2b is constructed using a plurality of second strands 22, which are made by twisting together a second strand 221 made of copper or a copper alloy, and these plurality of second strands 22 are twisted around the inner conductor portion 2a. The second strand 221 may have a plating of Zn (for example, amorphous Zn), Ni, Sn, etc. on its surface. The tensile strength of the second strand 221 is 220 MPa or more, and the elongation at break is 10% or more. The tensile strength and elongation at break of the second strand 221 are greater than those of the first strand 211. Here, the second strand 221 is made of Sn-plated soft copper wire with an outer diameter of 0.45 mm, which is the same outer diameter as the first strand 211. The outer diameter of the second strand 221 is, for example, 0.10 mm or more and 0.50 mm or less. It is preferable that the outer diameter of the second strand 221 is the same as or larger than the outer diameter of the first strand 211. This makes it easier to reduce the amount of copper used in conductor 2 while also reducing the outer diameter of conductor 2.

[0017] Each of the second sub-strands 22 that constitute the outer conductor portion 2b is formed by collectively twisting a plurality of second elementary strands 221. By collectively twisting the plurality of second elementary strands 221 to form the second sub-strand 22, the second elementary strands 221 can move easily within the second sub-strand 22, and the shape of the second sub-strand 22 can be easily changed by an external force. Therefore, it becomes possible to reduce the gaps between the second sub-strands 22 and between the first sub-strand 21 and the second sub-strand 22, and to reduce the outer diameter of the conductor 2, by the force or the like when twisting the second sub-strands 22 together. In the present embodiment, similar to the above-described first sub-strand 21, the second sub-strand 22 is formed by collectively twisting 16 second elementary strands 221. Note that the number of the second elementary strands 221 that constitute the second sub-strand 22 is not limited to 16. The number of the second elementary strands 221 that constitute the second sub-strand 22 may be less than 16 or may be more than 16. Also, in the present embodiment shown in FIG. 1, the number of the second sub-strands 22 that constitute the outer conductor portion 2b is 18, but it is not limited to this. The number of the second sub-strands 22 that constitute the outer conductor portion 2b can be appropriately changed within a range where the ratio (the number of the first sub-strands 21 / the number of the second sub-strands 22) of the number of the first sub-strands 21 to the number of the second sub-strands 22 is 40 / 60 or more and 60 / 40 or less. Further, the outer diameter of the second sub-strand 22 is preferably the same as or larger than the outer diameter of the first sub-strand 21. Thereby, the first sub-strand 21 made of aluminum or an aluminum alloy, which is more easily deformed than the second sub-strand 22 made of copper or a copper alloy, can be easily deformed by the force received from the second sub-strand 22 side (that is, the first sub-strand 21 can be easily deformed by the second sub-strand 22 that is harder than the first sub-strand 21). Therefore, it becomes easier to obtain the effect of reducing the outer diameter of the conductor 2 while reducing the amount of copper used for the conductor 2.

[0018] In the present embodiment, the first elementary strand 211 and the second elementary strand 221 having the same outer diameter are used, and the number of the first elementary strands 211 that constitute the first sub-strand 21 is the same as the number of the second elementary strands 221 that constitute the second sub-strand 22. Therefore, the outer diameters of the first sub-strand 21 and the second sub-strand 22 are substantially the same. Thereby, it becomes difficult for a gap to occur between the sub-strands 21 and 22 due to concentric twisting.

[0019] The outer conductor part 2b is formed by twisting 18 second-level stranded wires 22 around the inner conductor part 2a. Thus, the entire conductor 2 is formed by concentric twisting. That is, the conductor 2 is formed by concentrically twisting a plurality of (here, 19) first-level stranded wires 21 and a plurality of (here, 18) second-level stranded wires 22. This makes it possible to increase the conductor cross-sectional area while reducing the outer diameter, making the entire conductor 2 have a small diameter, which leads to a reduction in the overall diameter of the electric wire 1.

[0020] The ratio (number of first-level stranded wires 21 / number of second-level stranded wires 22) of the number of first-level stranded wires 21 to the number of second-level stranded wires 22 used for the conductor 2 is preferably 40 / 60 or more and 60 / 40 or less. Also, for the conductor 2, the ratio of the cross-sectional area of the inner conductor part 2a (= the total value of the cross-sectional areas of each first-level stranded wire 21) to the cross-sectional area of the outer conductor part 2b (= the total value of the cross-sectional areas of each second-level stranded wire 22) is preferably 40 / 60 or more and 60 / 40 or less. This can suppress the increase in the resistance value of the conductor 2 and the heat generation amount, while reducing the amount of copper used and making it possible to obtain a small-diameter electric wire 1, realizing a lightweight and easily bendable electric wire 1. For example, when making the electric wire 1 have a small diameter while reducing the amount of copper used for the conductor 2 and making the resistance value (= conductor resistance) of the conductor 2 small to increase the conductivity of the conductor 2, the ratio of the cross-sectional area of the inner conductor part 2a to the cross-sectional area of the outer conductor part 2b is preferably 40 / 50 or more and 50 / 50 or less (more preferably, 40 / 50 or more and 45 / 55 or less). On the other hand, when making the electric wire 1 have a small diameter while reducing the amount of copper used for the conductor 2 and making the electric wire 1 lighter and more easily bendable, the ratio of the cross-sectional area of the inner conductor part 2a to the cross-sectional area of the outer conductor part 2b is preferably 50 / 50 or more and 60 / 40 or less (more preferably, 55 / 45 or more and 60 / 40 or less). Note that regarding the ratio of the number of first-level stranded wires 21 to the number of second-level stranded wires 22 used for the conductor 2, by changing it within the range of 40 / 60 or more and 60 / 40 or less, it is possible to obtain the same effect as when changing the ratio of the above-mentioned cross-sectional areas.

[0021] Incidentally, when forming the conductor 2, a second stranded wire 22 made of copper or a copper alloy is twisted around an inner conductor portion 2a made of aluminum or an aluminum alloy to form an outer conductor portion 2b. At this time, since the inner conductor portion 2a made of aluminum or an aluminum alloy is relatively soft and easy to deform, when the second stranded wire 22 made of copper or a copper alloy, which has higher rigidity compared to the first stranded wire 21, is twisted around the inner conductor portion 2a, the inner conductor portion 2a is pushed inward (toward the cable center side) (compressed) by the force applied during the twisting. As a result, the first stranded wire 21 constituting the inner conductor portion 2a is crushed, the gap inside the inner conductor portion 2a becomes smaller, and the outer diameter of the inner conductor portion 2a becomes smaller (that is, the outer diameter of the inner conductor portion 2a is smaller compared to the state before twisting the second stranded wire 22). Thereby, the outer diameter of the entire conductor 2 can be reduced, and the entire wire 1 can be made smaller in diameter.

[0022] That is, by forming the inner conductor portion 2a from aluminum or an aluminum alloy, it is possible to reduce the outer diameter of the conductor 2 while maintaining the conductor cross-sectional area, and thus reduce the outer diameter of the entire wire 1. For example, in the present embodiment, the conductor cross-sectional area is 100 mm 2 (100 SQ), but it is possible to reduce the outer diameter of the conductor 2 to the outer diameter equivalent to 80 mm 2 (80 SQ) in a conventional conductor using only copper single wires.

[0023] Also, by forming the inner conductor portion 2a from aluminum or an aluminum alloy, it is possible to reduce the weight of the wire 1 compared to the case where the entire conductor 2 is made of copper or a copper alloy. Furthermore, since aluminum or an aluminum alloy is easier to deform compared to copper or a copper alloy, by forming the inner conductor portion 2a from aluminum or an aluminum alloy, the wire 1 can be easily bent, improving the workability during wiring work.

[0024] Incidentally, the first strand 211, which is made of aluminum or an aluminum alloy, is susceptible to damage and may easily break if damaged. However, by providing an outer conductor portion 2b made of copper or a copper alloy so as to surround the inner conductor portion 2a, the first strand 211 constituting the inner conductor portion 2a is protected from damage by the outer conductor portion 2b, and the breakage of the first strand 211 can be suppressed.

[0025] Furthermore, by constructing the outer conductor portion 2b, where the load is concentrated during bending, from relatively high-strength copper or a copper alloy, the bending resistance can be improved. Also, by constructing the outer conductor portion 2b from copper or a copper alloy, it is possible to suppress the resistance value of conductor 2 from becoming too high, and it becomes possible to maintain electrical characteristics that are almost the same as those of conventional electric wires using conductors made only of copper or copper alloy.

[0026] Furthermore, by constructing the outer conductor portion 2b from copper or a copper alloy, connection to terminals of the conductor 2 becomes easier compared to the case where the entire conductor 2 is constructed from aluminum or an aluminum alloy. For example, when the entire conductor 2 is constructed from aluminum or an aluminum alloy, it was necessary to use terminals with a special structure to maintain the strength of the connection. However, by constructing the outer conductor portion 2b from copper or a copper alloy, conventionally used terminals (for example, terminals that are crimped and fixed to the end of the conductor 2) can be used, and conventional soldering connections are also possible, thus improving versatility.

[0027] Furthermore, conventional electric wires that use only copper or copper alloy as conductors sometimes sag under their own weight when wired in a floating position. However, in the electric wire 1 according to this embodiment, the weight is reduced by using aluminum or an aluminum alloy for the inner conductor portion 2a, and the rigidity of the electric wire 1 is ensured by using copper or a copper alloy for the outer conductor portion 2b. Therefore, even when the electric wire 1 is wired in a floating position (for example, bent into a U-shape), it is possible to suppress it from sagging under its own weight.

[0028] An intervening material may be provided between the inner conductor portion 2a and the outer conductor portion 2b (the dotted line portion shown in Figure 1) to separate the inner conductor portion 2a and the outer conductor portion 2b and to suppress contact between the inner conductor portion 2a and the outer conductor portion 2b.

[0029] The intervening is constructed by spirally wrapping a tape material, such as a metal tape or resin tape, around the inner conductor portion 2a. When a metal tape is used as the intervening, it is preferable that it be made of a metal that can suppress galvanic corrosion of the conductor 2. By providing an intervening between the inner conductor portion 2a and the outer conductor portion 2b, galvanic corrosion occurring between the inner conductor portion 2a and the outer conductor portion 2b can be suppressed. Furthermore, the intervening should be constructed of a shape and material that prevents poor connection between the terminal portion and the non-connecting member when the terminal portion of the electric wire 1 is connected to a connecting member such as a connector to produce an electric wire with a connecting member. As an example of a metal tape, a tape material made by laminating a first metal made of aluminum or an aluminum alloy and a second metal made of copper or a copper alloy can be cited. When such a tape material is placed between the inner conductor portion 2a and the outer conductor portion 2b, it is preferable that the inner conductor portion 2a and the first metal face each other, and the outer conductor portion 2b and the second metal face each other. This makes it possible to suppress electrolytic corrosion that occurs between the inner conductor portion 2a and the outer conductor portion 2b, and to prevent poor connection between the end portion of the electric wire 1 and the non-connecting member.

[0030] (Insulator 3) In this embodiment, since aluminum or an aluminum alloy is used for a portion of the conductor 2 (the inner conductor portion 2a), the resistance of the conductor 2 is higher compared to the case where the conductor is made only of copper or a copper alloy, and consequently, the amount of heat generated is also higher. To withstand this amount of heat generation, it is preferable to use a resin composition with a heat resistance temperature of 120°C or higher as the insulator 3. Specifically, for example, the insulator 3 can be made of cross-linked polyethylene or fluororesin.

[0031] (cable) Next, a cable using the electric wire 1 will be described. Figure 2 is a cross-sectional view showing a section perpendicular to the longitudinal direction of the cable 10 according to this embodiment. As shown in Figure 2, the cable 10 comprises a cable core 11 containing a plurality of electric wires 1, and a sheath 12 provided to cover the periphery of the cable core 11 collectively.

[0032] The cable core 11 is constructed by twisting together adjacent wires 1 in the circumferential direction of the cable so that they are in contact with each other. In this embodiment, the cable core 11 is constructed by twisting together three wires 1 and multiple thread-like interlinings 14. The interlinings 14 are arranged to fill the gaps around the wires 1 (the area surrounded by the three wires 1 including the center of the cable and the area surrounded by adjacent wires 1 and the sheath 12) in order to make the outer shape of the cable 10 closer to a circular shape. In this embodiment, jute is used as the interlining 14. However, the interlining 14 is not limited to jute, and may be made of other materials such as rayon (staple fiber).

[0033] Furthermore, the cable 10 is further equipped with a retaining tape 13 that is spirally wrapped around the cable core 11. The retaining tape 13 serves to hold the twist of the cable core 11 in place so that it does not unravel. For example, nonwoven tape or paper tape can be used as the retaining tape 13. In this embodiment, a nonwoven tape (staple fiber tape) made of rayon (staple fiber) was used as the retaining tape 13.

[0034] The sheath 12 is provided so as to cover the perimeter of the retaining tape 13. More specifically, the sheath 12 has an annular cross-section (a cross-section perpendicular to the longitudinal direction of the cable) formed by tube extrusion, and is provided so as not to penetrate between adjacent electric wires 1. The sheath 12 is made of, for example, an irradiation-crosslinked resin composition that has been irradiated and crosslinked by electron beam irradiation. Specifically, the sheath 12 can be made of, for example, irradiation-crosslinked flame-retardant polyethylene (FRPE) with a heat resistance temperature of 125°C or higher.

[0035] (Operation and Effects of the Embodiment) As described above, in the electric wire 1 according to this embodiment, the conductor 2 has an inner conductor portion 2a formed by twisting together a plurality of first strands 211 made of aluminum or an aluminum alloy, and an outer conductor portion 2b formed by twisting together a plurality of second strands 221 made of copper or a copper alloy, and twisting together a plurality of second strands 22 around the inner conductor portion 2a.

[0036] By having an inner conductor portion 2a made of aluminum or an aluminum alloy in the conductor 2, the amount of expensive copper used can be reduced, resulting in a low-cost, lightweight, and easily bendable electric wire 1. Furthermore, when the second stranded wire 22 made of copper or a copper alloy is twisted together, the inner conductor portion 2a is compressed, which reduces the outer diameter of the conductor 2, making it possible to reduce the overall diameter of the electric wire 1. By reducing the diameter of the electric wire 1, the amount of resin used in the insulator 3 can be reduced, further reducing costs. In addition, the electric wire 1 of the present invention makes it possible to improve handling during wiring and reduce transportation costs by compactly bundling them during delivery. The present invention is particularly useful for large-diameter electric wires 1 with a conductor cross-sectional area of ​​60 mm², where the amount of copper used would be large if the entire conductor 2 were made of copper or a copper alloy. 2 This is particularly effective for electric wires 1 with an outer diameter of 10 mm or more (60SQ) or larger.

[0037] (Summary of the embodiments) Next, the technical concept understood from the embodiments described above will be described using the reference numerals and other symbols from the embodiments. However, the reference numerals and other symbols in the following description are not limited to the components in the claims that are specifically shown in the embodiments.

[0038] [1] An electric wire (1) comprising a conductor (2) and an insulator (3) provided to cover the conductor (2), wherein the conductor (2) has an inner conductor portion (2a) formed by twisting together a plurality of first strands (211) made of aluminum or an aluminum alloy, and an outer conductor portion (2b) formed by twisting together a plurality of second strands (22) made of copper or a copper alloy, and the plurality of second strands (22) made of copper or a copper alloy around the inner conductor portion (2a).

[0039] [2] The electric wire (1) described in [1], wherein the first stranded wire (21) is made of a bundled stranded wire formed by twisting together a plurality of first strands (211), the second stranded wire (22) is made of a bundled stranded wire formed by twisting together a plurality of second strands (221), and the conductor (2) is a concentric stranded wire formed by concentrically twisting together the plurality of first stranded wires (21) and the plurality of second stranded wires (22).

[0040] [3] The electric wire (1) according to [1] or [2], wherein the ratio of the cross-sectional area of ​​the inner conductor portion (2a) to the cross-sectional area of ​​the outer conductor portion (2b) is 40 / 60 or more and 60 / 40 or less.

[0041] [4] The conductor (2) is the electric wire (1) according to [1] or [2], wherein the ratio of the number of first stranded wires (21) to the number of second stranded wires (22) is 40 / 60 or more and 60 / 40 or less.

[0042] [5] The conductor (2) is a wire (1) as described in any one of items [1] to [4], wherein the outer diameter of the first stranded wire (21) is the same as or smaller than the outer diameter of the second stranded wire (22).

[0043] [6] The conductor (2) is an electric wire (1) as described in any one of items [1] to [5], wherein the outer diameter of the first strand (211) is the same as or smaller than the outer diameter of the second strand (221).

[0044] [7] A wire (1) according to any one of items [1] to [6], wherein an intervening is provided between the inner conductor portion (2a) and the outer conductor portion (2b).

[0045] [8] The intervening is a tape member made of metal tape, the electric wire (1) as described in [7].

[0046] [9] The electric wire (1) according to any one of items [1] to [8], wherein the heat resistance temperature of the insulator (3) is 120°C or higher.

[0047] A cable (10) comprising a cable core (11) containing a plurality of electric wires (1) as described in any one of items

[10] [1] to [9], and a sheath (12) provided to cover the periphery of the cable core (11) collectively.

[0048] Although embodiments of the present invention have been described above, the embodiments described above do not limit the invention as defined in the claims. Furthermore, it should be noted that not all combinations of features described in the embodiments are necessarily essential for solving the problem of the invention.

[0049] Furthermore, the present invention can be implemented with appropriate modifications without departing from its spirit. [Explanation of Symbols]

[0050] 1...Electric wire 2... Conductor 2a...Inner conductor part 2b...Outer conductor part 21...First child stranded wire 211...First strand 22…Second child stranded wire 221...Second strand 3…Insulator 10… Cable 11… Cable core 12...Sheath

Claims

1. In an electric wire comprising a conductor and an insulator covering the conductor, The aforementioned conductor is An inner conductor made of aluminum or an aluminum alloy, An outer conductor made of copper or a copper alloy, It has, The ratio of the cross-sectional area of ​​the inner conductor to the cross-sectional area of ​​the outer conductor is 40 / 60 or more and 60 / 40 or less. Between the inner conductor portion and the outer conductor portion, a tape member is provided, which is made by laminating a first metal made of aluminum or an aluminum alloy and a second metal made of copper or a copper alloy. The tape member is arranged such that the inner conductor portion and the first metal face each other, and the outer conductor portion and the second metal face each other. The outer diameter of the conductor was reduced to the size of the outer diameter of a conductor made solely of copper. Electric wire.

2. The cross-sectional area of ​​the conductor is 60 mm². ２ (60 SQ) or more, The outer diameter of the electric wire is 10 mm or more. The electric wire according to claim 1.

3. The heat resistance temperature of the insulator is 120°C or higher. The electric wire according to either claim 1 or 2.

4. A cable core comprising a plurality of electric wires as described in any one of claims 1 to 3, A sheath is provided to cover the entire perimeter of the cable core, The included cable.

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