electric wire

Abstract

The present invention provides an electric wire that reduces exhaust gas leakage through the wire and also has excellent flexibility. The electric wire includes: a compressed conductor comprising a plurality of wires twisted together; and a sheath covering the outer periphery of the compressed conductor. In a cross section perpendicular to the longitudinal direction of the compressed conductor, the cross-sectional area of ​​the compressed conductor is 0.3 mm 2 The compressed conductor has a contact portion where the corresponding wires contact each other. The contact portion has a straight portion and at least one intersection, and three or more straight portions intersect at the at least one intersection. The sheath includes one or more of a fluoropolymer and a fluororubber, and the sheath enters a recess between the wires located at the periphery of the compressed conductor. The sheath has an adhesion force per unit area to the compressed conductor of 0.09 N / mm 2 above.

Description

Technical Field

[0001] The present invention relates to an electric wire. Background Art

[0002] For example, Patent Document 1 discloses a flame-retardant polyethylene insulated wire. In this flame-retardant polyethylene insulated wire, multiple outer wires are twisted together around a central conductor and compressed under high pressure to form a compressed stranded conductor. Each wire is formed into a fan-shaped shape with a large-diameter outer arc and a small-diameter inner arc. The outer peripheral surface of the compressed stranded conductor is smoothly formed without any gaps between the outer arcs of adjacent outer wires. Furthermore, an insulation layer made of a flame-retardant polyethylene resin is applied to the outer periphery of the compressed stranded conductor.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2008-135196 Summary of the Invention

[0006] Problems to be solved by the present invention

[0007] As disclosed in Patent Document 1, various studies have been conducted on electric wires having a plurality of conductors in each of which a plurality of wires are twisted together.

[0008] However, if a generator on a motorcycle or similar device is connected to other components via an electrical wire comprising a conductor composed of multiple twisted wires, exhaust gas generated by the generator, oil such as a coolant, and the like may leak through gaps between the electrical wires and into the other components. Therefore, it is necessary to reduce the leakage of exhaust gas, oil, and the like through the electrical wires.

[0009] Wires installed in motorcycles and other equipment must be deformed into a predetermined shape during installation. Furthermore, after installation, they may be subjected to forces and repeatedly deformed during use. Therefore, the wires must also possess excellent flexibility to prevent breakage caused by repeated forces and deformation.

[0010] In view of the above circumstances, an object of the present disclosure is to provide an electric wire that reduces exhaust gas leakage through the electric wire and also has excellent flexibility.

[0011] Means of solving the problem

[0012] According to the disclosure of the present invention, a compression conductor comprises: a plurality of wires twisted together; and a sheath covering the outer periphery of the compression conductor. In a cross section perpendicular to the longitudinal direction of the compression conductor, the cross-sectional area of ​​the compression conductor is 0.3 mm 2The compressed conductor has a contact portion where the corresponding wires contact each other. The contact portion has a straight portion and at least one intersection, and three or more straight portions intersect at the at least one intersection. The sheath includes one or more of a fluoropolymer and a fluororubber, and the sheath enters a recess between the wires located at the periphery of the compressed conductor. The sheath has an adhesion force per unit area to the compressed conductor of 0.09 N / mm 2 above.

[0013] Effects of the Invention

[0014] According to the disclosure of the present invention, it is possible to provide an electric wire that reduces exhaust gas leakage through the electric wire and also has excellent flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of an electric wire according to an embodiment of the disclosure of the present invention;

[0016] Figure 2 is a diagram describing the adhesion test; and

[0017] Figure 3 is a diagram describing a bending test. DETAILED DESCRIPTION

[0018] Next, embodiments will be described.

[0019] [Description of Disclosed Embodiments of the Invention]

[0020] First, various aspects of the disclosure of the present invention will be listed and described. In the following description, the same or corresponding elements are denoted by the same reference numerals, and description thereof will not be repeated.

[0021] (1) According to one aspect of the present disclosure, an electric wire includes a compressed conductor and a sheath. The compressed conductor includes a plurality of wires twisted together and a sheath covering the outer periphery of the compressed conductor. In a cross section perpendicular to the longitudinal direction of the compressed conductor, the cross-sectional area of ​​the compressed conductor is 0.3 mm 2 The compressed conductor has a contact portion where the corresponding wires contact each other. The contact portion has a straight portion and at least one intersection, and three or more straight portions intersect at the at least one intersection. The sheath includes one or more of a fluoropolymer and a fluororubber, and the sheath enters a recess between the wires located at the periphery of the compressed conductor. The sheath has an adhesion force per unit area to the compressed conductor of 0.09 N / mm 2 above.

[0022] In an electric wire according to one aspect of the disclosure of the present invention, a twisted wire comprising a plurality of wires is used as a compression conductor. Therefore, the flexibility of the electric wire can be improved compared to the case where a single wire is used as a conductor. In addition, in a cross section perpendicular to the longitudinal direction of the compression conductor, the contact portion has a straight portion and an intersection portion, and at each intersection portion, three or more straight portions intersect. In the above state, the wires constituting the compression conductor can be densely arranged. Therefore, the compression conductor has no gaps or almost no gaps between the wires, and therefore exhaust leakage through the electric wire can be particularly reduced.

[0023] Furthermore, the sheath enters the recessed area between the wires at the outer periphery of the compressed conductor. This prevents gaps between the compressed conductor and the sheath. Furthermore, since the sheath enters the recessed area, the sheath's adhesion to the compressed conductor is enhanced. Consequently, exhaust gas leakage through the wires caused by gaps between the compressed conductor and the sheath is reduced.

[0024] Furthermore, the adhesion force per unit area of ​​the sheath to the compressed conductor is 0.09 N / mm 2 Therefore, exhaust gas leakage via the electric wires can be particularly reduced.

[0025] (2) The adhesion force per unit area of ​​the sheath to the compressed conductor can be 0.48N / mm 2 the following.

[0026] When the adhesion force per unit area of ​​the sheath to the compressed conductor is within the above range, the flexibility of the electric wire according to an aspect of the disclosure of the present invention may be particularly increased.

[0027] (3) The cross-sectional area can be 0.3 mm 2 Above and 1.75mm 2 the following.

[0028] When the cross-sectional area of ​​the compressed conductor is 0.3mm 2 Therefore, the electric wire can be suitably used for connecting a radiator to another component such as an electronic component in a motorcycle or the like in which exhaust gas leakage through the electric wire needs to be reduced.

[0029] In addition, when the cross-sectional area of ​​the compressed conductor is 1.75mm 2 When the value is below , the exhaust gas leakage through the electric wires can be particularly reduced.

[0030] (4) The sheath may comprise fluorine-containing rubber.

[0031] When the sheath is formed on the surface of the compressed conductor, the fluororubber can easily conform to the surface shape of the compressed conductor. Therefore, the adhesion between the compressed conductor and the sheath can be particularly increased, and exhaust gas leakage through the wire can be particularly reduced.

[0032] (5) The wire material may be selected from one or more of nickel-plated copper wire, silver-plated copper wire, and tin-plated annealed copper wire, and the contact portions may each include one or more of nickel, silver, and tin.

[0033] By using one or more of nickel-plated copper wire, silver-plated copper wire, and tin-plated annealed copper wire as the wire, the corrosion resistance of the wire and the compressed conductor can be improved.

[0034] (6) The adhesion force per unit area of ​​the sheath to the compressed conductor can be 0.11 N / mm 2 Above and 0.27N / mm 2 the following.

[0035] The adhesion force per unit area when the sheath is attached to the compressed conductor is 0.11N / mm 2 In the above case, exhaust gas leakage through the electric wires can be particularly reduced.

[0036] The adhesion force per unit area when the sheath is attached to the compressed conductor is 0.27N / mm 2 When the above is done, the flexibility of the electric wire according to one aspect of the present disclosure can be particularly increased.

[0037] (7) According to one aspect of the present disclosure, an electric wire includes a compressed conductor and a sheath. The compressed conductor includes a plurality of wires twisted together and a sheath covering the outer periphery of the compressed conductor. In a cross section perpendicular to the longitudinal direction of the compressed conductor, the cross-sectional area of ​​the compressed conductor is 0.3 mm 2 Above and 1.75mm 2 The following is a compressed conductor having a contact portion, where the corresponding wires contact each other. The contact portion has a straight portion and at least one intersection portion, and three or more straight portions intersect at the at least one intersection portion. The sheath includes one or more of a fluoropolymer and a fluororubber, and the sheath enters a recess between the wires located at the outer periphery of the compressed conductor. The sheath has an adhesion force per unit area to the compressed conductor of 0.11 N / mm 2 Above and 0.27N / mm 2 The porosity in the cross section perpendicular to the longitudinal direction of the compressed conductor is 0.

[0038] [Details of the disclosed embodiment of the present invention]

[0039] The following will describe specific examples of the electric wire according to the disclosed embodiment of the present invention (hereinafter referred to as "this embodiment") with reference to the drawings. However, it should be understood that the present invention is not limited to these examples and is intended to include all modifications within the meaning and scope of the claims and their equivalents.

[0040] Figure 1 A cross section perpendicular to the longitudinal direction of the electric wire 10 according to the present embodiment is shown. Figure 1 The cross section shown in FIG. 1 is also perpendicular to the longitudinal direction of the compressed conductor 11 of the electric wire 10 .

[0041] like Figure 1 As shown, the electric wire 10 according to the present embodiment includes a compression conductor 11 and a sheath 12 covering the outer circumference of the compression conductor 11 .

[0042] (1) Components of electrical wires

[0043] Next, components of the electric wire according to the present embodiment will be described.

[0044] (1-1) Compression Conductor

[0045] (Structure of compressed conductor)

[0046] The compression conductor 11 may include a plurality of wires 13 twisted together. Figure 1 The example in which the compressed conductor 11 includes one first wire 13A arranged in the center and six second wires 13B arranged to surround the first wire 13A is shown; however, the present invention is not limited to this example. The compressed conductor 11 may include any number of wires depending on the required cross-sectional area, etc.

[0047] The compressed conductor 11 may have a structure in which a plurality of wires 13 are twisted together in compression from the outer peripheral side. Therefore, in a cross section perpendicular to the longitudinal direction of the compressed conductor 11, the compressed conductor 11 may include a contact portion 14 where the corresponding wires 13 contact each other. The contact portion 14 may include a straight portion 141 having a straight shape and at least one intersection portion 142 where three or more straight portions intersect.

[0048] The straight portion 141 includes a straight portion 141A, which is a portion where the second wires 13B contact each other, and a straight portion 141B, which is a portion where the first wire 13A contacts the second wire 13B.

[0049] For example, the portion where the second wires 13B contact each other may include a portion having any shape other than a straight line, such as a curved line. However, the portion where the second wires 13B contact each other is preferably a completely straight line portion having a straight line shape, so that gaps between the wires can be avoided and leakage of exhaust gas, etc. can be reduced. The same applies to the portion where the first wire 13A contacts the second wire 13B.

[0050] Furthermore, the compression conductor 11 may include at least one intersection portion 142 where three or more straight line portions 141 intersect. Figure 1 As shown, the intersection portion 142 may be a point where a straight line portion 141A where two second wires 13B contact each other intersects a straight line portion 141B where the first wire 13A contacts the second wire 13B.

[0051] By using a twisted wire composed of multiple wires 13 as the compressed conductor 11, the flexibility of the electric wire 10 according to this embodiment can be improved compared to the case of using a single wire as the conductor. Note that the flexibility of the electric wire refers to the ability to minimize breakage of the electric wire when the electric wire is repeatedly bent.

[0052] Furthermore, in a cross-section perpendicular to the longitudinal direction of the compressed conductor 11, the compressed conductor 11 includes contact portions 14 where the corresponding wires 13 contact each other. The contact portions 14 include straight sections 141 and intersections 142, with three or more straight sections intersecting at each intersection. In this state, the wires 13 are densely arranged within the compressed conductor 11. Consequently, the compressed conductor 11 has no or almost no gaps between the wires 13, and thus can significantly reduce exhaust gas leakage through the electric wire 10.

[0053] The compression conductor 11 may include a plurality of recesses 131 at its outer circumference. The recesses 131 are formed between the wires 13 constituting the compression conductor 11.

[0054] In a cross section perpendicular to the longitudinal direction of the compressed conductor 11, the cross-sectional area of ​​the compressed conductor 11 may be 0.3 mm 2 The cross-sectional area of ​​the compressed conductor 11 can be calculated by multiplying the cross-sectional area of ​​the wire by the number of wires constituting the compressed conductor 11 .

[0055] When the cross-sectional area of ​​the compressed conductor 11 is 0.3 mm 2 Therefore, the electric wire can be suitably used for connecting a radiator to another component such as an electronic component in a motorcycle or the like in which exhaust gas leakage through the electric wire needs to be reduced.

[0056] The upper limit of the cross-sectional area of ​​the compressed conductor 11 is not particularly limited. For example, the cross-sectional area of ​​the compressed conductor 11 is preferably less than 2.0 mm 2 , and more preferably 1.75 mm 2 Particularly, when the cross-sectional area of ​​the compressed conductor 11 is within the above-mentioned range, the exhaust gas leakage via the electric wire can be particularly reduced.

[0057] (Wire material that makes up the compressed conductor)

[0058] The material of the wire material 13 constituting the compression conductor 11 is not particularly limited. For example, one or more of a bare copper wire, a nickel-plated copper wire, a silver-plated copper wire, and a tin-plated annealed copper wire can be used as the wire material 13 .

[0059] In particular, when one or more of nickel-plated copper wire, silver-plated copper wire, and tin-annealed copper wire is used as the wire 13, the contact portions 14 may each include one or more of nickel, silver, and tin derived from the plating. By using one or more of nickel-plated copper wire, silver-plated copper wire, and tin-annealed copper wire as the wire 13, the corrosion resistance of the wire 13 and the compressed conductor 11 can be improved.

[0060] (1-2) Sheath

[0061] The sheath 12 covers the outer circumference of the compressed conductor 11 and serves as an insulating coating.

[0062] (Structure of the sheath)

[0063] The sheath 12 may enter the recesses 131 between the wires 13 at the outer periphery of the compression conductor 11 .

[0064] As described above, by allowing the sheath 12 to enter the recess 131, the gap between the conductor 11 and the sheath 12 can be avoided from being compressed. In addition, by allowing the sheath 12 to enter the recess 131, the adhesion of the sheath 12 to the compressed conductor 11 can be improved. As a result, exhaust gas leakage through the electric wire due to the gap between the compressed conductor 11 and the sheath 12 can be reduced.

[0065] (Material of sheath)

[0066] The jacket 12 may include one or more of a fluoropolymer and a fluororubber. The jacket 12 may include a mixture of the fluoropolymer and the fluororubber. By including one or more of the fluoropolymer and the fluororubber, the jacket 12 can conform to the surface shape of the compressed conductor when formed on the surface of the compressed conductor. This can increase the adhesion between the compressed conductor 11 and the jacket 12.

[0067] Examples of the fluorine-containing polymer include polyvinylidene fluoride (PVDF) and ethylene-tetrafluoroethylene (ETFE) copolymer.

[0068] Examples of fluorine-containing rubber include fluorine rubber and fluorosilicone rubber. Specific examples of fluorine rubber include tetrafluoroethylene-propylene (TFE-P) copolymer, 1,1-difluoroethylene-tetrafluoroethylene-propylene (TFE-P-VdF) copolymer, chlorosulfonated polyethylene-tetrafluoroethylene-propylene (TFE-P-CSM) copolymer, and vinylidene fluoride-based fluororubber (FKM).

[0069] In particular, the jacket 12 preferably includes fluororubber. When the jacket 12 is formed on the surface of the compressed conductor 11, the fluororubber conforms more easily to the surface shape of the compressed conductor 11 than a fluoropolymer. Therefore, the adhesion between the compressed conductor 11 and the jacket 12 can be particularly increased. The jacket 12 is preferably composed only of fluororubber.

[0070] (2) Characteristics of wires

[0071] (Adhesion per unit area of ​​the sheath to the compressed conductor)

[0072] The adhesion force per unit area of ​​the sheath 12 to the compressed conductor 11 is preferably high. For example, the adhesion force per unit area of ​​the sheath 12 to the compressed conductor 11 is preferably 0.09 N / mm 2 More than, and more preferably 0.11N / mm 2 above.

[0073] When the adhesion force per unit area of ​​the sheath 12 to the compressed conductor 11 is within the above range, exhaust gas leakage via the electric wire can be particularly reduced.

[0074] The upper limit of the adhesion force per unit area of ​​the sheath 12 to the compressed conductor 11 is not particularly limited. The adhesion force per unit area of ​​the sheath 12 to the compressed conductor 11 is preferably 0.48 N / mm 2 Below, and more preferably 0.27N / mm 2 the following.

[0075] When the adhesion force per unit area of ​​the sheath 12 to the compressed conductor 11 is within the above range, the flexibility of the electric wire according to the present embodiment can be increased.

[0076] like Figure 2 As shown, the adhesion per unit area of ​​the sheath 12 to the compressed conductor 11 can be measured by using an adhesion measurement tool 21 having a through hole through which only the compressed conductor 11 passes.

[0077] Specifically, first, the sheath 12 is removed from the electric wire 10 while leaving a portion of the sheath 12 unremoved to expose the compression conductor 11 .

[0078] Insert the exposed compression conductor 11 into the through hole of the adhesion measurement tool 21. In this way, the wire 10 is set on the adhesion measurement tool 21, as shown in FIG. Figure 2 shown.

[0079] Next, with the adhesion measurement tool 21 fixed, Figure 2 Wire 10 is pulled in the direction indicated by arrow A. The magnitude of the force applied when jacket 12 is peeled off from compressed conductor 11 and compressed conductor 11 is moved through the through-hole of adhesion measurement tool 21 to a position below the adhesion measurement tool is then measured. By dividing the measured force by the area of ​​the portion of compressed conductor 11 covered by jacket 12, the adhesion force per unit area of ​​jacket 12 to compressed conductor 11 can be obtained.

[0080] (Porosity)

[0081] The porosity in the cross section perpendicular to the longitudinal direction of the electric wire according to the present embodiment is not particularly limited, but is preferably 1% or less, and more preferably 0%.

[0082] By setting the porosity in the cross section perpendicular to the longitudinal direction of the electric wire according to the present embodiment to 1% or less, exhaust gas leakage via the electric wire can be particularly reduced.

[0083] The porosity of the electric wire refers to, for example, the percentage of voids in the area surrounded by the outer periphery of the sheath 12 in a cross section perpendicular to the longitudinal direction of the electric wire. The porosity can be obtained by observing a given cross section perpendicular to the longitudinal direction of the electric wire with an optical microscope and measuring and calculating the ratio of the area of ​​the voids to the area of ​​the area surrounded by the outer periphery of the sheath 12.

[0084] Although specific embodiments have been described above, the present embodiment is not limited to the above-described embodiments, and variations and modifications may be made without departing from the scope of the subject matter described in the claims.

[0085] [Example]

[0086] Although the present invention will be described in further detail with reference to the following examples, the present invention is not limited to the following examples.

[0087] (Evaluation method)

[0088] First, a method of evaluating an electric wire manufactured in each of the following experimental examples will be described.

[0089] (1) Compress the cross-sectional area of ​​the conductor / conductor

[0090] The cross-sectional area of ​​the compressed conductor / conductor is calculated by multiplying the cross-sectional area of ​​the wire by the number of wires that make up the compressed conductor / conductor.

[0091] (2) Porosity

[0092] The cross section perpendicular to the longitudinal direction of the manufactured electric wire was observed with an optical microscope, and the area ratio of the voids in the cross section of the electric wire was calculated to obtain the porosity of the electric wire.

[0093] (3) Adhesion test

[0094] like Figure 2 As shown, the adhesion test is performed by using an adhesion measurement tool 21 having a through hole through which only the compression conductor passes.

[0095] First, the sheath 12 of the electric wire is removed, and a portion of the sheath 12 is left unremoved to expose the compressed conductor 11. At this time, the portion of the sheath 12 left unremoved has a length L of 30 mm in the longitudinal direction of the electric wire, as shown in FIG. Figure 2 shown.

[0096] Next, the exposed compression conductor 11 is inserted into the through hole of the adhesion measurement tool 21. In this way, the wire is set on the adhesion measurement tool 21, as shown in FIG. Figure 2 shown.

[0097] Next, with the adhesion measurement tool 21 fixed, Figure 2 The wire is pulled in the direction indicated by arrow A at a speed of 200 mm / minute. As jacket 12 peels away from compressed conductor 11 and compressed conductor 11 passes through the through-hole of adhesion measurement tool 21 and moves downward to a position below adhesion measurement tool 21, the magnitude of the applied force is measured. The measured force is divided by the area of ​​the portion of compressed conductor 11 covered by jacket 12 to obtain the adhesion force per unit area of ​​the jacket to the compressed conductor.

[0098] By dividing the circumscribed circle C11 (see FIG. Figure 1 ) by 30 mm (which is the length L of the sheath 12) to calculate the area of ​​the portion of the compressed conductor 11 covered by the sheath 12.

[0099] In an experimental example using a non-compressed conductor instead of a compressed conductor, the adhesion force per unit area of ​​the sheath to the conductor was measured in a similar manner.

[0100] (4) Air leakage test

[0101] The wires produced in the following experimental examples were cut into 500 mm lengths and used as test pieces for air leakage testing. Air was supplied from one end of the test piece at a pressure of 0.1 MPa for one minute, and the air leaking from the other end of the test piece was collected with a graduated cylinder, and the amount of air was measured.

[0102] If the measured air volume is 1.5 mL or less, it is evaluated as A, if the measured air volume is greater than 1.5 mL and is 4 mL or less, it is evaluated as B, if the measured air volume is greater than 4 mL and is 5 mL or less, it is evaluated as C, and if the measured air volume is greater than 5 mL, it is evaluated as D.

[0103] As the measured air amount decreases, that is, as the evaluation is performed in the order of A, B, C, and D, the exhaust gas leakage through the electric wire decreases.

[0104] (5) Bending test

[0105] During the bending test, Figure 3 As shown, the wires manufactured in the following experimental examples are vertically clamped between two mandrels 311 and 312 arranged horizontally and parallel to each other. The two mandrels 311 and 312 each have a diameter of 12.5 mm. At this time, a load of 4.9 N is applied to the wire. Next, the upper end of the wire is bent 90° toward the horizontal direction to contact the upper side of one mandrel 311, and then, the upper end of the wire is bent 90° toward the horizontal direction to contact the upper side of the other mandrel 312. While measuring the resistance value of the compressed conductor or conductor of the wire, the bending action is repeated. Specifically, the bending is repeated until the resistance value of the compressed conductor or conductor increases by more than 10 times the initial resistance value, and the number of times the bending is performed is obtained. Regarding the number of times the wire is bent, the wire is bent from Figure 3 The process of bending the right side to the left side and then back to the right side is counted as one time. As the value obtained in the bending test increases, that is, as the number of times the wire is bent increases, the flexibility of the wire increases.

[0106] If the number of bending times was 3,000 or more, it was evaluated as A, if the number of bending times was 750 or more and less than 3,000 times, it was evaluated as B, and if the number of bending times was less than 750, it was evaluated as C.

[0107] Next, the electric wire produced in each experimental example will be described. Experimental example 1 is an example, and Experimental examples 2 to 6 are comparative examples.

[0108] (Experimental Example 1)

[0109] Made with Figure 1 The cross-sectional structure of the wire is shown.

[0110] (Process of forming a compressed conductor)

[0111] Seven wires (all copper wires having a wire diameter of 0.32 mm) were twisted together and compressed by passing through a plurality of wire drawing dies. In this way, a compressed conductor 11 was manufactured. As the copper wire, an unplated bare copper wire was used. The outer diameter of the obtained compressed conductor 11 (i.e., the diameter of the circumscribed circle C11) was 0.8 mm, and the cross-sectional area of ​​the compressed conductor 11 was 0.56 mm. 2 .

[0112] (Sheath Formation Process)

[0113] Cross-linked fluororubber (TFE-P) is formed on the outer periphery of the compression conductor 11 by extrusion molding.

[0114] The obtained electric wires were evaluated by the above-mentioned evaluation methods. Table 1 shows the evaluation results.

[0115] In a cross section perpendicular to the longitudinal direction of the obtained electric wire, as Figure 1 As shown, the compressed conductor 11 has a contact portion 14, where the corresponding wires 13 contact each other. In addition, the contact portion 14 has a straight portion 141 in a straight line shape. In addition, there are six intersections 142 along the circumference of the first wire 13A, and three straight portions 141 intersect at each intersection.

[0116] Furthermore, it has been confirmed that the compression conductor 11 has six recesses 131 between the wires 13 at the outer periphery of the compression conductor 11 , and the sheath 12 enters into the recesses 131 .

[0117] (Experimental Examples 2 to 4)

[0118] In the process of forming the compressed conductor, the configuration of the drawing die was changed so that the obtained compressed conductor had the outer diameter shown in Table 1.

[0119] Except for the above-mentioned points, electric wires were produced and evaluated in the same manner as in Experimental Example 1. Table 1 shows the evaluation results.

[0120] and Figure 1 The compressed conductors 11 of the illustrated wires 10 are similar. In cross-sections perpendicular to the longitudinal direction of each wire manufactured in Experimental Examples 2 to 4, the compressed conductors of each wire have contact portions 14 where corresponding wires 13 come into contact with each other. Some of these contact portions 14 have straight sections 141 that are linear. However, gaps are formed at positions corresponding to intersections 142 in Experimental Example 1. In Experimental Examples 2 to 4, the straight sections 141 do not intersect, and no intersections are formed.

[0121] It was confirmed that the compressed conductor of each electric wire manufactured in Experimental Examples 2 to 4 had six recesses 131 between the electric wires located at the outer periphery of the compressed conductor. In addition, it was confirmed that the sheath 12 entered the recesses 131 of the compressed conductor of each electric wire.

[0122] (Experimental Example 5)

[0123] As the conductor, a stranded wire obtained by twisting 19 wires (all copper wires having a wire diameter of 0.19 mm) was used. As the copper wire, an unplated bare copper wire was used. In addition, the stranded wire used was not compressed.

[0124] Except that a stranded wire was used instead of the compressed conductor, electric wires were produced and evaluated in the same manner as in Experimental Example 1. Table 1 shows the evaluation results.

[0125] The conductor of the electric wire obtained in Experimental Example 5 was not compressed as described above. Therefore, although there was a contact portion where the wires were in contact with each other, no intersection portion of the straight line portion was formed.

[0126] (Experimental Example 6)

[0127] A single copper wire having a wire diameter of 0.8 mm was used as a conductor. As the copper wire, an unplated bare copper wire was used.

[0128] Except that a single copper wire was used instead of the compressed conductor, electric wires were produced and evaluated in the same manner as in Experimental Example 1. Table 1 shows the evaluation results.

[0129]

[0130] As can be seen from the results shown in Table 1, in the electric wire of Experimental Example 1 in which the compressed conductor had a predetermined cross-sectional structure, the evaluation result of the air leakage test was A, and the evaluation result of the bending test was B. That is, it was confirmed that the electric wire of Experimental Example 1 can reduce exhaust gas leakage through the electric wire and also has excellent flexibility.

[0131] Furthermore, in a cross section perpendicular to the longitudinal direction of the wire of Experimental Example 1, the compressed conductor has a contact portion where the corresponding wires contact each other, and the contact portion has a straight line portion and at least one intersection portion, where three or more straight line portions intersect. Furthermore, in the wire of Experimental Example 1, the sheath extends into recesses between the wires on the outer circumference of the compressed conductor.

[0132] In contrast, in the wires of Experimental Examples 2 to 4, the degree of compression during the manufacture of the compressed conductors varied, and no intersections were formed in the compressed conductors. In these wires, the bending test evaluation results were high in the order of Experimental Examples 2 to 4, but the air leakage test evaluation results were low. This is believed to be because, as the degree of compression decreased in the order of Experimental Examples 2 to 4, gaps formed between the wires constituting the compressed conductors.

[0133] Furthermore, in the electric wire of Experimental Example 5 in which a twisted wire was used as a conductor instead of the compressed conductor, the evaluation result of the air leakage test was D, which was very poor.

[0134] Furthermore, in the electric wire of Experimental Example 6 in which a single wire material was used as a conductor, although the evaluation result of the air leakage test was A which was good, the evaluation result of the bending test was C which was very poor.

[0135] Description of Reference Numerals

[0136] 10 Wires

[0137] 11. Compressed Conductor

[0138] 12 Sheath

[0139] 13 Wire

[0140] 13A First Wire

[0141] 13B Second wire

[0142] 131 recess

[0143] 14 Contact part

[0144] 141, 141A, 141B straight section

[0145] 142 intersection

[0146] 21 Adhesion Measurement Tools

[0147] 311, 312 spindle

Claims

1. An electric wire comprising: a compressed conductor comprising a plurality of wires twisted together; as well as a sheath covering the outer circumference of the compression conductor, The cross-sectional area of ​​the compressed conductor in the cross section perpendicular to the longitudinal direction of the compressed conductor is 0.3 mm. 2 above, and the compression conductor has a contact portion at which the corresponding wires contact each other, The contact portion has a straight line portion and at least one intersection portion, and three or more straight line portions intersect at the at least one intersection portion. The sheath comprises one or more of a fluoropolymer and a fluororubber, and the sheath enters a recess between the wires at the periphery of the compression conductor, and The sheath is attached to the compressed conductor with an adhesion force per unit area of ​​0.11 N / mm 2 Above and 0.27N / mm 2 the following.

2. The electric wire according to claim 1, wherein The cross-sectional area is 0.3 mm 2 Above and 1.75mm 2 the following.

3. The electric wire according to claim 1 or 2, wherein The sheath comprises fluororubber.

4. The electric wire according to claim 1 or 2, wherein The wire is selected from one or more of nickel-plated copper wire, silver-plated copper wire and tin-plated annealed copper wire, and the contact parts all contain one or more of nickel, silver and tin.

5. An electric wire comprising: a compressed conductor comprising a plurality of wires twisted together; as well as a sheath covering the outer circumference of the compression conductor, The cross-sectional area of ​​the compressed conductor in the cross section perpendicular to the longitudinal direction of the compressed conductor is 0.3 mm. 2 Above and 1.75mm 2 Hereinafter, the compression conductor has a contact portion at which the corresponding wires contact each other, The contact portion has a straight line portion and at least one intersection portion, and three or more straight line portions intersect at the at least one intersection portion. The sheath comprises one or more of a fluoropolymer and a fluororubber, and the sheath enters a recess between the wires at the periphery of the compression conductor, The sheath is attached to the compressed conductor with an adhesion force per unit area of ​​0.11 N / mm 2 Above and 0.27N / mm 2 The following, and The porosity in the cross section perpendicular to the longitudinal direction of the compression conductor is 0.

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