Aluminum wires and wiring harnesses

Abstract

To provide an aluminum electric wire capable of improving flexibility and addictiveness, and a wire harness.SOLUTION: An aluminum electric wire includes a conductor 10 and an insulator 20. The conductor 10 is constituted of a central strand wire 11 and a plurality of outer peripheral strand wires 12 laminated with two or more layers on the outer periphery of the central strand wire 11; the central strand wire 11 and the outer peripheral strand wires 12 are constituted by stranding an element wire consisting of pure aluminum; the element wire has an element wire diameter of 0.21 mm or more and less than 1.0 mm; the conductor 10 and the insulator 20 have an adhesion force of 6 N or more and 45 N or less; and the insulator 20 has a thickness of 0.72 mm or more and 1.80 mm or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an aluminum electric wire and a wiring harness. [Background technology]

[0002] Conventionally, aluminum electric wires in which an insulator is coated on the outer periphery of an aluminum conductor have been proposed (see, for example, Patent Documents 1 to 3). These aluminum electric wires are improved in flexibility by using a specific material for the insulator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-99412 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-104227 [Patent Document 3] Japanese Patent Application Publication No. 2019-179628 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the flexibility of an electric wire is determined by the sum of various factors, such as the material, wire diameter, and twisting configuration of the conductor, the material and thickness of the insulator, and the state of adhesion between the conductor and the insulator, etc. Therefore, the electric wires described in Patent Documents 1 to 3 have room for improvement in flexibility.

[0005] In addition, copper electric wires are difficult to bend, resulting in a large bending radius during installation. For this reason, when installing copper electric wires, protectors and band clamps are used to restrict the route to prevent interference with devices and other electric wires. In contrast, aluminum electric wires are more susceptible to bending than copper electric wires. However, even aluminum electric wires still lack sufficient bending properties, and in some cases, the route must be restricted using band clamps or similar.

[0006] The present invention has been made to solve the above-mentioned problems in the prior art, and an object of the invention is to provide an aluminum electric wire and a wiring harness that can be improved in flexibility and shapeability. [Means for solving the problem]

[0007] The aluminum electric wire according to the present invention comprises a conductor and an insulator covering the conductor, the conductor being composed of a central strand and a plurality of peripheral strands laminated in two or more layers around the periphery of the central strand, the central strand and the peripheral strand being composed of strands of pure aluminum, each of the strands having a diameter of 0.21 mm or more and less than 1.0 mm, and the conductor and the insulator are: For a 75 mm aluminum electric wire, the insulation is stripped off by a length of 25 mm from one end to expose the conductor, and the conductor is inserted into a hole in a plate material with a diameter of the conductor outer diameter + 0.1 mm. The conductor is then pulled from the insertion side at a speed of 200 mm / min until the conductor is separated from the insulation. This is the maximum force measured when the conductor is pulled out. The adhesion force is between 6N and 45N. The other end of the 400 mm aluminum electric wire is fixed, and a load is applied from one end until the aluminum electric wire is bent 180 degrees. The insulator has a flexibility of 7N or more and 11N or less, and a thickness of 0.72mm or more and 1.80mm or less.

[0008] A wire harness according to the present invention is characterized by including the aluminum electric wire described above. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an aluminum electric wire and a wiring harness that can be improved in flexibility and shapeability. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing an example of a wire harness including an aluminum electric wire according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view showing an example of the aluminum electric wire shown in FIG. [Figure 3] 3 is a cross-sectional view showing an example of a partial configuration of the aluminum electric wire shown in FIG. 2. [Figure 4] 1 is a first diagram showing examples and comparative examples. [Figure 5]2 is a second diagram showing examples and comparative examples. [Figure 6] 1A and 1B are schematic diagrams showing a method for measuring adhesion, in which FIG. 1A shows a sample for measuring adhesion, and FIG. 1B shows the method for measuring adhesion. [Figure 7] FIG. 1 is a conceptual diagram showing a flexibility test. [Figure 8] 10 is a table showing the results of a shape forming test. [Figure 9] 1 is a table showing the results of a comparison between the aluminum electric wire of Example 3 and the copper electric wire of Comparative Example 10. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described below in accordance with preferred embodiments. Note that the present invention is not limited to the embodiments shown below and can be modified as appropriate without departing from the spirit of the present invention. In addition, in the embodiments shown below, some components are omitted from illustration and description, but it goes without saying that publicly known or well-known technologies are applied as appropriate to the details of the omitted technologies within the scope of the content described below.

[0012] Fig. 1 is a perspective view showing an example of a wire harness including an aluminum electric wire according to an embodiment of the present invention. As shown in Fig. 1, the wire harness WH is configured to include an aluminum electric wire 1 and other members O. The other members O are, for example, connectors O1 and terminals O2. Note that the other members O are not limited to the connectors O1 and terminals O2, and may be other electric wires, etc.

[0013] Fig. 2 is a cross-sectional view showing an example of the aluminum electric wire 1 shown in Fig. 1, and Fig. 3 is a cross-sectional view showing an example of a partial configuration of the aluminum electric wire 1 shown in Fig. 2. As shown in Fig. 2, the aluminum electric wire 1 includes a conductor 10 and an insulator 20 that covers the outer periphery of the conductor 10 in contact with each other.

[0014] The conductor 10 includes a central stranded wire 11 and a plurality of peripheral stranded wires 12. The plurality of peripheral stranded wires 12 are arranged to form two or more layers on the outer periphery of the central stranded wire 11. The peripheral stranded wires 12 are assumed to be bunch twisted around the central stranded wire 11, but are not limited to bunch twisting and may be concentrically twisted. As shown in FIG. 3, the central stranded wire 11 and the peripheral stranded wire 12 are formed by twisting a plurality of wires 11a, 12a made of pure aluminum.

[0015] In this embodiment, the wires 11a, 12a constituting the central stranded wire 11 and the peripheral stranded wire 12 have a wire diameter of 0.21 mm or more and less than 1.0 mm. If the wire diameter is less than 0.21 mm, the wires 11a, 12a are too thin and prone to breakage, whereas if the wire diameter is 1.0 mm or more, the wires 11a, 12a are too thick and lose flexibility.

[0016] In this embodiment, the adhesive force between the conductor 10 and the insulator 20 is 6 N or more and 45 N or less. If the adhesive force is less than 6 N, the conductor 10 and the insulator 20 will move too easily independently when bending the wire, significantly reducing the ability to form the wire. If the adhesive force exceeds 45 N, the adhesive force will be too strong, making it difficult for the conductor 10 and the insulator 20 to move independently, causing them to act like a thick rod and reducing flexibility.

[0017] Furthermore, in this embodiment, the thickness of the insulator 20 is 0.72 mm or more and 1.80 mm or less. If the thickness is less than 0.72 mm, the insulator 20 is too thin and does not have sufficient abrasion resistance. If the thickness exceeds 1.80 mm, the insulator 20 is too thick and does not have sufficient flexibility.

[0018] Additionally, in this embodiment, the insulator 20 is preferably made of cross-linked polyethylene, because cross-linked polyethylene strikes a balance between heat resistance and cost, making it easier to provide an aluminum electric wire 1 that is more excellent in heat resistance and cost.

[0019] Furthermore, the cross-sectional area (size) of the conductor 10 is preferably 30 sq or more and 230 sq or less. If the cross-sectional area is less than 30 sq, the weight reduction effect is reduced compared to a copper electric wire of the same size. If the cross-sectional area exceeds 230 sq, the size becomes too large, making it difficult to apply to, for example, a vehicle.

[0020] Furthermore, it is preferable that the twist pitch of the central stranded wire 11 is 15 to 30 times (preferably 20 times) the twist outer diameter, and that the twist pitch of the peripheral stranded wires 12 is 8 to 15 times (preferably 11 times) the outer diameter of the corresponding layer. Here, the corresponding layer refers to the first layer in the case of the peripheral stranded wire 12 belonging to the first layer, and the second layer in the case of the peripheral stranded wire 12 belonging to the second layer. In other words, it is preferable that the twist pitch of the peripheral stranded wire 12 in the first layer is 8 to 15 times the outer diameter of the first layer, and that the twist pitch of the peripheral stranded wire 12 in the second layer is 8 to 15 times the outer diameter of the second layer. This is because adopting these twist pitches can contribute to preventing wire breakage, loose twist, and twist collapse.

[0021] Next, examples of the present invention and comparative examples will be described. Figures 4 and 5 are diagrams showing examples and comparative examples.

[0022] First, as shown in Figures 4 and 5, all of the wires constituting the conductor in Example 1 were made of pure aluminum. The conductor size in Example 1 was 50 sq. m, and the central strand and the outer strand had 19 strands in the main twist and 32 strands in the undertwist, with a wire diameter of 0.32 mm. The cross-sectional area of ​​such a conductor was 48.9 mm. 2 The outer diameter was 10.0 mm. In Example 1, the insulator was made of cross-linked polyethylene (PE) and had a thickness of 1.50 mm. The aluminum electric wire according to Example 1 had an outer diameter of 13.0 mm. Furthermore, the adhesion force was measured using a measurement method in accordance with ISO 19642, which will be described later, and the adhesion force was found to be 6 N.

[0023] The aluminum electric wire according to Example 2 was the same as Example 1 except that the adhesive force was 45N.

[0024] In Example 3, all the wires were made of pure aluminum. The conductor size was 95 sq., and the central strand and the outer strand had 19 strands in the main twist and 62 strands in the under twist, with a wire diameter of 0.32 mm. The cross-sectional area of ​​such a conductor was 94.7 mm. 2 The outer diameter was 13.9 mm. In Example 3, the insulator was made of cross-linked polyethylene and had a thickness of 1.50 mm. The aluminum electric wire according to Example 3 had an outer diameter of 16.9 mm. Furthermore, the adhesion force was 9 N.

[0025] On the other hand, in Comparative Example 1, all of the wires constituting the conductor were made of pure copper. Also, in Comparative Example 1, the conductor size was 30 sq., and the central strand and the outer strand had 19 strands in the main twist and the under twist, with a wire diameter of 0.32 mm. The cross-sectional area of ​​such a conductor was 29.0 mm. 2 The outer diameter was 7.8 mm. In Comparative Example 1, the insulator was made of cross-linked polyethylene and had a thickness of 1.30 mm. The aluminum electric wire according to Comparative Example 1 had an outer diameter of 10.4 mm. Furthermore, the adhesion force was 86 N.

[0026] In Comparative Example 2, all of the wires constituting the conductor were made of pure copper. The conductor size was 35 sq., and the central strand and the outer strand had 19 strands in the main twist and 23 strands in the under twist, with a wire diameter of 0.32 mm. The cross-sectional area of ​​such a conductor was 35.2 mm. 2 The outer diameter was 8.4 mm. In Comparative Example 2, the insulator was made of cross-linked polyethylene and had a thickness of 1.50 mm. The aluminum electric wire according to Comparative Example 2 had an outer diameter of 11.4 mm. Furthermore, the adhesion force was 95 N.

[0027] In Comparative Example 3, all the wires constituting the conductor were made of pure copper. The conductor size was 40 sq., and the central strand and the outer strand had 19 main strands and 26 under-strands, with a wire diameter of 0.32 mm. The cross-sectional area of ​​such a conductor was 39.7 mm. 2 The outer diameter was 9.1 mm. In Comparative Example 3, the insulator was made of cross-linked PE and had a thickness of 1.40 mm. The electric wire according to Comparative Example 3 had an outer diameter of 11.9 mm. Furthermore, the adhesion force was 110 N.

[0028] In Comparative Example 4, all of the wires constituting the conductor were made of pure aluminum. The conductor size was 50 sq., and the central strand and the outer strand had 19 strands in the main twist and 83 strands in the under twist, with a wire diameter of 0.20 mm. The cross-sectional area of ​​such a conductor was 50.6 mm. 2 The outer diameter was 9.9 mm. In Comparative Example 4, the insulator was made of cross-linked PE and had a thickness of 1.50 mm. The aluminum electric wire according to Comparative Example 4 had an outer diameter of 12.9 mm. This aluminum electric wire was not usable as a product due to wire breakage during production, and therefore, measurements of adhesion and the like were not performed.

[0029] In Comparative Example 5, all of the wires constituting the conductor were made of pure aluminum. The conductor size was 50 sq., and the central strand and the outer strand had 19 strands in the main twist and 32 strands in the under twist, with a wire diameter of 0.32 mm. The cross-sectional area of ​​such a conductor was 48.9 mm. 2 The outer diameter was 10.0 mm. In Comparative Example 5, the insulator was made of cross-linked PE and had a thickness of 0.50 mm. The aluminum electric wire according to Comparative Example 5 had an outer diameter of 11.0 mm. Note that this aluminum electric wire was not viable as a product because the thickness of the insulator was too thin to ensure wear resistance and the coating thickness was unstable. For this reason, measurements of adhesion and the like were not performed on Comparative Example 5.

[0030] In Comparative Example 6, the conductor was the same as in Comparative Example 5. In addition, in Comparative Example 6, the insulator was made of cross-linked PE and had a thickness of 0.72 mm. The aluminum electric wire according to Comparative Example 6 had an outer diameter of 11.4 mm. The adhesion force was 5 N.

[0031] In Comparative Example 7, the conductor was the same as in Comparative Example 5. In addition, in Comparative Example 7, the insulator was made of cross-linked polyethylene and had a thickness of 1.80 mm. The aluminum electric wire according to Comparative Example 7 had an outer diameter of 13.6 mm. The adhesion force was 52 N.

[0032] In Comparative Example 8, all of the wires constituting the conductor were made of pure aluminum. In Comparative Example 8, the conductor size was 50 sq. m, and the stranded wire was made by twisting 61 wires each having a wire diameter of 1.0 mm. The cross-sectional area of ​​such a conductor was 47.9 mm. 2 The outer diameter was 9.0 mm. In Comparative Example 8, the insulator was made of cross-linked polyethylene and had a thickness of 1.50 mm. The aluminum electric wire according to Comparative Example 8 had an outer diameter of 12.0 mm. Furthermore, the adhesion force was 28 N.

[0033] In Comparative Example 9, all of the wires constituting the conductor were made of pure aluminum. The conductor size was 50 sq., and the central strand and the outer strand had 19 main strands and 13 under-strands, with a wire diameter of 0.5 mm. The cross-sectional area of ​​such a conductor was 48.5 mm. 2 The outer diameter was 9.4 mm. In Comparative Example 9, the insulator was made of cross-linked polyethylene and had a thickness of 1.50 mm. The aluminum electric wire according to Comparative Example 9 had an outer diameter of 12.4 mm. Furthermore, the adhesion force was 200 N.

[0034] In Comparative Example 10, all of the wires constituting the conductor were made of pure copper. The conductor size was 70 sq., and the central strand and the outer strand had 19 strands in the main twist and 46 strands in the under twist, with a wire diameter of 0.32 mm. The cross-sectional area of ​​such a conductor was 70.3 mm. 2The outer diameter was 12.0 mm. In Comparative Example 10, the insulator was made of cross-linked PE and had a thickness of 1.50 mm. The electric wire according to Comparative Example 10 had an outer diameter of 15.0 mm. Furthermore, the adhesion force was 120 N.

[0035] In Comparative Example 11, all the wires constituting the conductor were made of pure aluminum. The conductor size was 95 sq., and the central strand and the outer strand had 19 strands in the main twist and 25 strands in the under twist, with a wire diameter of 0.5 mm. The cross-sectional area of ​​such a conductor was 93.2 mm. 2 The outer diameter was 12.9 mm. In Comparative Example 11, the insulator was made of cross-linked polyethylene and had a thickness of 1.50 mm. The aluminum electric wire according to Comparative Example 11 had an outer diameter of 15.9 mm. Furthermore, the adhesion force was 55 N.

[0036] In Comparative Example 12, all of the wires constituting the conductor were made of aluminum alloy. The conductor size was 50 sq., and the central strand and the outer strand had 19 main strands and 32 under-strands, with a wire diameter of 0.32 mm. The cross-sectional area of ​​such a conductor was 48.9 mm. 2 The outer diameter was 10.0 mm. In Comparative Example 12, the insulator was made of cross-linked polyethylene and had a thickness of 1.50 mm. The aluminum electric wire according to Comparative Example 12 had an outer diameter of 13.0 mm. Furthermore, the adhesion force was 54 N.

[0037] The adhesion was measured as follows: Figure 6 is a schematic diagram showing the method for measuring adhesion, where (a) shows a sample for measuring adhesion, and (b) shows the method for measuring adhesion.

[0038] To measure the adhesion force, first, a 25 mm length of insulation was stripped off from one end of a 75 mm long wire to expose the conductor, as shown in Figure 6(a). Then, as shown in Figure 6(b), the conductor was inserted into a hole in a plate with a diameter of the conductor outer diameter + 0.1 mm, and pulled from the insertion side at a speed of 200 mm / min until the conductor was separated from the insulator. The force (maximum) when the conductor was pulled out was taken as the adhesion force.

[0039] The electric wires of Examples 1 to 3 and Comparative Examples 1 to 12 were subjected to a flexibility test, and the electric wires of Examples 1 to 3 and Comparative Examples 2 and 6 were subjected to a curling test.

[0040] Figure 7 is a conceptual diagram showing the flexibility test. For the flexibility test, a 400 mm electric wire with an insulator covering the conductor was used as the sample. As shown in Figure 7, the other end of the sample was fixed, and a load was applied from one end. The load at which the sample was bent 180 degrees was taken as the flexibility.

[0041] Figure 8 is a chart showing the results of the formability test. In the formability test, as shown in Figure 8, electric wires were wrapped around cylinders of φ75 and φ50, secured with cable ties or the like, left to stand for one minute, and then released, and the extent to which the electric wires spread was evaluated. Regarding the evaluation in Figures 4 and 5, if the spread of the electric wire on the line passing through the center of the cylinder (see the dashed line in Figure 8) was 75 mm or more, the formability was evaluated as "×", and if it was less than 75 mm, the formability was evaluated as "◯". The reason for using cylinders of φ75 and φ50 is to check the formability of the electric wire at approximately five times its diameter.

[0042] As shown in Figures 4 and 5, Examples 1 to 3 had flexibility of 7N or more and 11N or less, resulting in excellent flexibility. Similarly, Comparative Examples 1, 2, and 6 also had excellent flexibility. In particular, it was found that the aluminum electric wires of Examples 1 to 3 were thicker than the copper electric wires of Comparative Examples 1 and 2, but were able to exhibit the same degree of flexibility. On the other hand, Comparative Examples 3, 7 to 12 had flexibility exceeding 11N, and did not achieve the same level of flexibility as Examples 1 to 3. Note that Comparative Examples 4 and 5 were not viable as products, and flexibility measurements were not performed.

[0043] 4, 5, and 8, in Examples 1 to 3 (Example 3 is omitted in Fig. 8), the spread of the aluminum electric wire was less than 75 mm, and the shapeability was good, that is, the electric wire did not require route restriction by a protector or band clamp. On the other hand, in Comparative Examples 2 and 6 (Comparative Example 2 is omitted in Fig. 8), the spread of the electric wire was 75 mm or more, and route restriction was required.

[0044] From the above, it was found that the aluminum electric wires according to Examples 1 to 3 were able to achieve improvements in flexibility and shapeability.

[0045] The aluminum electric wires according to the examples do not have a significantly larger outer diameter than copper electric wires, and therefore can be significantly lighter. Fig. 9 is a chart showing the results of a comparison between the aluminum electric wire of Example 3 and the copper electric wire of Comparative Example 10. When the ambient temperature was 105°C and a current of 250 A was continuously applied, as shown in Fig. 9, the maximum temperature of the conductor of the aluminum electric wire according to Example 3 was 136.9°C, and the maximum temperature of the conductor of the copper electric wire according to Comparative Example 10 was 137.2°C. In other words, the two had approximately the same temperature.

[0046] Comparing the outer diameters of the electric wires, the aluminum electric wire according to Example 3 was 16.9 mm, and the copper electric wire according to Comparative Example 10 was 15.0 mm. That is, the aluminum electric wire according to Example 3 had an outer diameter of approximately 113.5% of that of the copper electric wire according to Comparative Example 10, and there was not much difference between the two.

[0047] In contrast, a comparison of weights reveals that the aluminum electric wire according to Example 3 has a weight of 288.5 g / m, while the copper electric wire according to Comparative Example 10 has a weight of 731.3 g / m. In other words, the weight of the aluminum electric wire according to Example 3 is reduced by approximately 60.6% compared to the copper electric wire according to Comparative Example 10.

[0048] Thus, in the aluminum electric wire 1 and the wire harness WH according to this embodiment, the conductor 10 is not only composed of the central stranded wire 11 and the outer circumferential stranded wire 12 formed by twisting the element wires 11a, 12a, but also has a wire diameter of less than 1.0 mm. This prevents the element wires 11a, 12a from becoming too thick and impairing the flexibility of the aluminum electric wire 1. Furthermore, since the element wire diameter is 0.21 mm or more, the possibility of the electric wire breaking when being bent is reduced.

[0049] Furthermore, since the adhesive force between the conductor 10 and the insulator 20 is 6 N or more, a certain degree of adhesive force is ensured, making it difficult for the conductor 10 and the insulator 20 to move separately, and reducing the loss of formability that would otherwise occur if each of them moved independently. Also, since the adhesive force between the conductor 10 and the insulator 20 is 45 N or less, the conductor 10 and the insulator 20 are integrated, reducing the loss of flexibility that would occur when bending a thick object.

[0050] In addition, since the thickness of the insulator 20 is 0.72 mm or more and 1.80 mm or less, the insulator 20 is prevented from being too thin to ensure wear resistance, or from being too thick to reduce flexibility.

[0051] Therefore, it is possible to provide the aluminum electric wire 1 and the wire harness WH that can be improved in flexibility and shapeability.

[0052] Furthermore, since the insulator 20 is made of cross-linked polyethylene, it is possible to provide an aluminum electric wire 1 that is superior in both heat resistance and cost by achieving a good balance.

[0053] Furthermore, since the conductor 10 has a cross-sectional area of ​​30 sq. or more, it has a certain degree of weight reduction effect compared to copper wires of the same size, while the cross-sectional area is 230 sq. or less, so it is not too large and can be easily applied to vehicles, for example.

[0054] Furthermore, the twist pitch of the central stranded wire 11 is 15 to 30 times the twist outer diameter, and the twist pitch of the peripheral stranded wire 12 is 8 to 15 times the twist outer diameter, which greatly reduces the possibility of exceeding the processing limit and helps prevent wire breakage, loose twist, and loose twist.

[0055] The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and modifications may be made or well-known and well-known technologies may be combined within the scope of the invention.

[0056] For example, in the wire harness WH according to the present embodiment, the connector O1 and the terminal O2 are exemplified as examples of the other member O, but the other member O is not particularly limited to these and may be, for example, an aluminum electric wire 1 of the same type. [Explanation of symbols]

[0057] 1: Aluminum wire 10: conductor 11: Center strand 12: Peripheral stranded wire 11a,12a: Plain wire 20: Insulator O: Other materials WH: Wire harness

Claims

1. An aluminum electric wire comprising a conductor and an insulator covering the conductor, the conductor being composed of a central stranded wire and a plurality of peripheral stranded wires laminated in two or more layers around the central stranded wire, the central stranded wire and the peripheral stranded wires being constructed by twisting together wires made of pure aluminum, The wires each have a wire diameter of 0.21 mm or more and less than 1.0 mm, The conductor and the insulator are For a 75 mm aluminum electric wire, the insulator is stripped off by a length of 25 mm from one end to expose the conductor, the conductor is inserted into a hole in a plate material having a diameter of the conductor outer diameter + 0.1 mm, and the conductor is pulled from the insertion side at a speed of 200 mm / min until the conductor is separated from the insulator, and the adhesion force, which is the maximum force when the conductor is pulled out from the insertion side at a speed of 200 mm / min until the conductor is separated from the insulator, is 6 N or more and 45 N or less, The other end of the 400 mm aluminum electric wire is fixed, and a load is applied from one end of the aluminum electric wire, and the flexibility, which is the load at the time when the aluminum electric wire is bent by 180 degrees, is 7 N or more and 11 N or less, The insulator has a thickness of 0.72 mm or more and 1.80 mm or less.

1. An aluminum electric wire comprising:

2. The insulator is cross-linked polyethylene The aluminum electric wire according to claim 1 .

3. The conductor has a cross-sectional area of ​​30 sq or more and 230 sq or less. The aluminum electric wire according to claim 1 .

4. The conductor has a twist pitch of the central stranded wire that is 15 to 30 times the twist outer diameter, and a twist pitch of the outer stranded wire that is 8 to 15 times the outer diameter of the corresponding layer. The aluminum electric wire according to claim 1 .

5. A wire harness comprising the aluminum electric wire according to any one of claims 1 to 4.

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