JP2016207273A - Wire for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire for an automobile, excellent in shock resistance.SOLUTION: There are included a wire conductor 12, and an electrical insulator 14 covering the outer periphery of the wire conductor 12. The wire conductor 12 has a stranded wire structure, and is configured so as to have a material with a breaking elongation value which gradually becomes higher from an element wire 12b arranged in the outermost layer of a stranded wire to an element wire 12a arranged in the center of the stranded wire. A ratio of a breaking elongation value (Ec) of the element wire 12a arranged in the center to a breaking elongation value (Eo) of the element wire 12b arranged in the outermost layer is preferably Ec/Eo>1.1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automobile electric wire, and more particularly to an automobile electric wire excellent in impact resistance.

  Metal materials such as pure copper and pure aluminum having a high electrical conductivity, a relatively high purity copper alloy, and a relatively high purity aluminum alloy are used for conductors of automobile wires. A conductor of an automobile electric wire mainly has a structure in which a plurality of metal strands are twisted together. Usually, the plurality of metal strands are made of the same metal material. For example, this is the case where all the metal wires constituting the conductor are made of pure copper. As a special configuration, a conductor configuration is known in which a stainless steel wire is disposed at the center and pure copper is disposed around the center (Patent Document 1).

Japanese Patent No. 4171888 JP 2010-218927 A Japanese Patent No. 5442294

  The number of electric wires used in one automobile is increasing due to the high functionality and multi-functionality of the automobile. However, the space where the wire harness can be routed in the automobile is limited, and it is required to reduce the diameter of the electric wire in order to secure the routing space. Further, the reduction in the diameter of the electric wire can contribute to the weight reduction of the automobile, so that the fuel consumption can be improved.

  If the conductor is composed only of a metal wire made of pure copper or pure aluminum, the strength is low and tensile disconnection is likely to occur. For this reason, such a conductor is difficult to apply to the conductor of a thin wire. Therefore, attempts have been made to use metal wires made of copper alloy or aluminum alloy with improved strength as the conductor material (Patent Documents 2 and 3).

  However, in general, the elongation becomes small as a contradiction for improving the strength. Even if it is high strength, its strength is low when it is pulled slowly, but it is weak against impact load due to sudden (instantaneous) pulling. For example, when manufacturing a wire harness or assembling to a car There is a risk of disconnection due to impact load. For this reason, the conductor excellent in impact resistance is calculated | required.

  The problem to be solved by the present invention is to provide an automobile electric wire excellent in impact resistance.

  In order to solve the above problems, an automotive electric wire according to the present invention includes an electric wire conductor and an insulator covering an outer periphery of the electric wire conductor, the electric wire conductor has a stranded wire structure, and the outermost of the stranded wire. The gist of the invention is that the material has a higher elongation at break as it goes from the wire arranged in the outer layer to the wire arranged in the center of the stranded wire.

The ratio between the breaking elongation value (Ec) of the strand arranged in the center and the breaking elongation value (Eo) of the strand arranged in the outermost layer is preferably Ec / Eo> 1.1. . The breaking elongation value (Eo) of the strands arranged in the outermost layer is preferably 5% or more. The strand is preferably made of any one of copper, copper alloy, aluminum, aluminum alloy, iron, stainless steel wire, magnesium, and magnesium alloy. It is desirable that the material of the wire is of the same system. A value obtained by dividing the tensile breaking load Wc (N) of the electric wire conductor by the total value Ac (mm ² ) of the cross-sectional area of the strands, Wc / Ac is preferably 100 or more. A value (J / (m · mm ² )) obtained by dividing the deformation energy (J) until the tensile break of the electric wire conductor by the electric wire length (m) and the total value Ac (mm ² ) of the cross-sectional area of the wire. Is preferably 6.0 or more. The cross-sectional area of the wire conductor is desirably 2.5 mm ² or less.

  According to the automobile electric wire according to the present invention, the electric wire conductor has a stranded wire structure, and the elongation at break increases from the strand arranged in the outermost layer of the stranded wire toward the strand arranged in the center of the stranded wire. Since it is configured to be a material having a high value, it has excellent impact resistance.

It is the perspective view (a) and circumferential direction sectional view (b) of the electric wire for motor vehicles concerning one embodiment of the present invention.

  Next, an embodiment of the present invention will be described in detail.

  The electric wire for automobiles according to the present invention includes an electric wire conductor and an insulator that covers the outer periphery of the electric wire conductor. The electric wire conductor has a twisted wire structure, and is configured to be a material having a higher elongation at break as it goes from the strand arranged in the outermost layer of the strand to the strand arranged in the center of the strand. Yes.

  A strand becomes a structure which draws a big spiral, so that the strand arranged outside is. The strand arranged in the outermost layer draws a larger spiral than the strand arranged in the center. The strand arranged in the center is a strand arranged inside the strand arranged in the outermost layer. The strand arranged at the center does not have a spiral structure, or even if it has a spiral structure, the strand is smaller than the strand arranged in the outermost layer. The spiral structure becomes an extra length in the tensile direction. As a result, when the wire is subjected to a tensile load, the force is not applied evenly, and the strand disposed in the outermost layer has a smaller amount of elongation, and the strand disposed in the center is stretched more greatly, The strands arranged in the outer layer are not stretched so much. Taking advantage of such characteristics of the stranded wire, in the present invention, a material having a higher elongation at break is formed from the strand disposed in the outermost layer of the stranded wire toward the strand disposed in the center of the stranded wire. Therefore, it has excellent impact resistance.

  From the viewpoint of impact resistance, the ratio between the breaking elongation value (Ec) of the strand arranged in the center and the breaking elongation value (Eo) of the strand arranged in the outermost layer is Ec / Eo> 1.1 It is preferable that

  For the strands arranged in the outermost layer, a material having relatively low elongation is used, but the elongation at break (Eo) is preferably 5% or more. More preferably, it is 10% or more.

  The strand arranged at the center is made of a material having relatively high elongation. The elongation at break (Ec) is preferably 10% or more.

  In view of securing the conductor strength, the tensile breaking load Wc is preferably 50 N or more. More preferably, it is 70 N or more.

  The tensile strength of the strand is measured with a general-purpose tensile tester in accordance with JIS Z 2241 (metal material tensile test method). Further, the elongation of the strand is measured by a general-purpose tensile tester in accordance with JIS Z 2241 (metal material tensile test method), and is represented by the elongation at break.

  The number of strands arranged in the center may be one or may be two or more depending on the total number of strands. For example, in the case of seven stranded wires, the number of strands arranged in the center is one and the number of strands arranged in the outermost layer is six. In the case of 11 stranded wires, the number of strands arranged in the center is 3, and the number of strands arranged in the outermost layer is 8. The strands may have the same diameter or different diameters.

  Examples of the metal material of the wire include pure copper, copper alloy, pure aluminum, aluminum alloy, SUS, iron, magnesium, and magnesium alloy.

  As a suitable combination of the strand arranged in the center and the strand arranged in the outermost layer, as a strand arranged in the center / element arranged in the outermost layer, pure aluminum / aluminum alloy, pure copper / Copper alloy, pure copper / aluminum alloy, pure aluminum / copper alloy, and the like. The metal of the wire arranged in the center and the metal of the wire arranged in the outermost layer are of the same system from the viewpoints of preventing contact corrosion of dissimilar metals, terminal processing (terminal), and excellent recyclability. It is preferable. The same system means, for example, copper-based metals and aluminum-based metals.

  According to the automotive electric wire according to the present invention having the above-described configuration, the electric wire conductor has a stranded wire structure, and the strand arranged from the strand arranged in the outermost layer of the stranded wire to the center of the stranded wire. Since it is comprised so that it may become a material with high breaking elongation value as it goes to, it is excellent in impact resistance. This is because, when an impact load is applied to the electric wire, the strand arranged in the outermost layer absorbs the impact by its spiral structure, and the strand arranged in the center absorbs the impact by extension. It is inferred to be done.

And the electric wire for motor vehicles concerning this invention is the total value Ac (mm < ² >) of the cross-sectional area of a strand from the viewpoint which has sufficient tensile strength as an electric wire for motor vehicles, and the tensile breaking load Wc (N) of an electric wire conductor. The divided value, Wc / Ac, is preferably 100 or more. Also, the value (J / (m · mm ² )) obtained by dividing the deformation energy (J) until the tensile break of the electric wire conductor by the total length Ac (mm ² ) of the wire length (m) and the cross-sectional area of the strands. Is preferably 6.0 or more.

And the electric wire for motor vehicles concerning this invention is remarkable by an electric wire whose cross-sectional area of an electric wire conductor is 2.5 mm < ² > or less.

  In the automotive electric wire according to the present invention, the insulator material is not particularly limited as long as it is a material used as a wire coating material. For example, polyolefin materials, polyvinyl chloride materials and the like can be mentioned.

  In FIG. 1, the electric wire for motor vehicles based on one Embodiment of this invention is shown. FIG. 1A is a perspective view, and FIG. 1B is a circumferential sectional view. An automotive electric wire 10 according to an embodiment includes an electric wire conductor 12 and an insulator 14 that covers the outer periphery of the electric wire conductor 12. The electric wire conductor 12 is comprised by the strand wire which consists of the strand 12a arrange | positioned in the center of 1 or more, and the strand 12b arrange | positioned in 1 or more outermost layers. In FIG. 1, the number of the strands 12a arrange | positioned in the center is seven, the number of the strands 12b arrange | positioned in the outermost layer is 12, and the electric wire conductor 12 is comprised by a total of 19 strands.

  Examples of the present invention will be described below.

(Conductor configuration)
An electric wire conductor (see FIG. 1 (b)) composed of 19 strands arranged in the center and 12 strands arranged in the outermost layer and a total of 19 strands was produced. Each strand diameter is 0.155 mm, and the conductor cross-sectional area (total value Ac (mm ² ) of the cross-sectional area of the strands) is 0.35 mm ² . Table 1 shows the material type, tensile strength, and elongation at break (Eo, Ec) of each strand. The tensile strength and breaking elongation value of the strands were measured with a general-purpose tensile tester in accordance with JIS Z 2241 (metal material tensile test method).

About the produced electric wire conductor, the tensile breaking load Wc (N) and the deformation energy (J) until the tensile breaking were measured with a general-purpose tensile testing machine according to JIS Z 2241 (metal material tensile testing method). The value Wc / Ac obtained by dividing the tensile breaking load Wc (N) by the total value Ac (mm ² ) of the cross-sectional area of the wire is used as an indicator of the conductor strength, and the deformation energy (J) until the tensile breaking is expressed as the wire length The value (J / (m · mm ² )) divided by m) and the total value Ac (mm ² ) of the cross-sectional area of the strands was used as an impact resistance index. Wc / Ac was 100 or better. (J / (m · mm ² )) was 6.0 or more. The results are shown in Table 1. Experiment No. 1 to 8 are examples according to the present invention. 9 to 12 are comparative examples.

  Experiment No. In all of the wire conductors 9 to 12, the breaking elongation value (Ec) of the strand arranged in the center is smaller than or equal to the breaking elongation value (Eo) of the strand arranged in the outermost layer. Not satisfied with impact properties. On the other hand, Experiment No. The wire conductors 1 to 8 all have impact resistance because the breaking elongation value (Ec) of the strand arranged in the center is larger than the breaking elongation value (Eo) of the strand arranged in the outermost layer. Satisfied.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Automotive electric wire 12 Electric wire conductor 12a Elementary wire 12b arrange | positioned in the center Elementary wire 14 arrange | positioned in outermost layer

Claims (8)

An electric wire conductor and an insulator covering the outer periphery of the electric wire conductor;
The wire conductor has a twisted wire structure, and the material having a high elongation at break as it goes from the strand arranged in the outermost layer of the strand to the strand arranged in the center of the strand. It is comprised so that it may become. The electric wire for motor vehicles characterized by the above-mentioned.   The ratio between the breaking elongation value (Ec) of the strand arranged in the center and the breaking elongation value (Eo) of the strand arranged in the outermost layer is Ec / Eo> 1.1. The automobile electric wire according to claim 1.   The electric wire for automobiles according to claim 1 or 2, wherein the breaking elongation value (Eo) of the strand arranged in the outermost layer is 5% or more.   4. The automobile according to claim 1, wherein the element wire is made of any one of copper, copper alloy, aluminum, aluminum alloy, iron, stainless steel wire, magnesium, and magnesium alloy. Electrical wire.   The material of the said strand is the same system | strain, The electric wire for motor vehicles of any one of Claim 1 to 4 characterized by the above-mentioned. The value obtained by dividing the tensile breaking load Wc (N) of the electric wire conductor by the total value Ac (mm ² ) of the cross-sectional area of the strands, and Wc / Ac is 100 or more. The electric wire for motor vehicles given in any 1 paragraph. A value (J / (m · mm ² )) obtained by dividing the deformation energy (J) until the tensile break of the electric wire conductor by the electric wire length (m) and the total value Ac (mm ² ) of the cross-sectional area of the wire. Is 6.0 or more, The electric wire for automobiles according to any one of claims 1 to 6. The automobile electric wire according to any one of claims 1 to 7, wherein a cross-sectional area of the electric wire conductor is 2.5 mm ² or less.

Images