JP2008091214A - Fiber composite electric wire conductor and insulating electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric wire conductor especially ideal as wiring for automobiles, and to provide an insulating electric wire using the electric wire conductor, where bending-resistant properties and vibration-resistance properties are superior and the weight is reduced. <P>SOLUTION: In the electric wire conductor, a stranded wire 4 is formed, by arranging the conductor stranded wire 3 at the outer periphery of a fiber core 2, stranding width L in the conductor stranded wire 3 is not smaller than 8 times and not more than 22 times larger than the layer core diameter R in the stranded wire 4. In the electric wire conductor, the conductor stranded wire 3 is arranged so that it completely covers the fiber core 2. In the insulating electric wire 1, the outer periphery of the electric wire conductor is covered with an insulator 5. In the insulator electric wire 1, the insulator 5 is made of fluororesin. The insulating electric wire 1 is used for wiring for automobiles. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric wire conductor that is excellent in bending resistance and vibration resistance and reduced in weight, particularly suitable as an automobile wiring, and an insulated wire using the electric wire conductor.

  In recent years, in automobiles, industrial robots, electrical equipment, thermal equipment, etc., the number of wiring points has increased along with the improvement in performance, and the reliability required for the wires used for those wirings has further increased. . At the same time, from the standpoint of energy saving and compactness, the weight reduction of the electric wire itself has been cited as a market requirement.

  In response to such a request, for example, in Patent Document 1, a wire conductor for harness that has been subjected to a heat treatment by compressing a stranded wire in which a copper element wire is arranged around an aramid fiber bundle or string as a center is provided. It is disclosed. Moreover, in patent document 2, although it is related with an aerial power transmission line, tension members, such as an aramid fiber and glass fiber, are arrange | positioned in the center part, and the strand wire conductor which consists of a twist of the some annealed copper strands on the outer side And an insulated wire having an insulating coating on the outside thereof is disclosed. Patent Document 3 has a structure in which a plurality of organic fibers having a maximum elongation of 10% or more are twisted around a center line made of copper or a copper alloy having a maximum elongation of 10% or more. In addition, a thin wire for a wire harness that defines a weight ratio and a cross-sectional area of an organic fiber relative to copper or a copper alloy is disclosed.

Japanese Patent No. 2683446: Sumitomo Electric Industries JP 2003-123542 A: Fujikura JP 2006-108035 A: Auto Network Giken

  Here, in particular, in an electric wire used for automobile wiring, vibration and repeated bending accompanying it always act on the electric wire, so that improvement of vibration resistance and bending resistance is an unavoidable issue. However, the technology that tackled such a problem from the front has not been disclosed yet. For example, Patent Document 1 merely mentions improvement in breaking load, prevention of terminal cracks, improvement in impact resistance, and weight reduction of electric wires. Moreover, in patent document 2, as the subject, only maintaining an overhead insulated wire in a normal overhead wire state, ie, improving overhead wire tension, is mentioned. Moreover, in patent document 3, the improvement of impact resistance, weight reduction, and high intensity | strength are only mentioned as the subject. Even if the problems listed in these Patent Documents 1 to 3 are overcome, they do not directly relate to the improvement of the vibration resistance and the bending resistance. This is because problems such as those listed in Patent Documents 1 to 3 are problems based on short-term events, whereas vibration resistance and flex resistance are problems based on long-term events. is there.

  The present invention has been made in order to solve such problems of the prior art, and the object of the present invention is to achieve excellent weight resistance and vibration resistance and light weight. It is in providing the suitable electric wire conductor and the insulated wire using this electric wire conductor.

In order to achieve the above object, the wire conductor according to claim 1 of the present invention is a wire conductor in which a conductor wire is disposed on the outer periphery around a fiber core, and the twist width of the conductor wire is The layer core diameter of the stranded wire is not less than 8 times and not more than 22 times.
The electric wire conductor according to claim 2 is characterized in that the conductor wire is disposed so as to completely cover the outer periphery of the fiber core.
According to a third aspect of the present invention, there is provided an electric wire conductor characterized in that the insulated electric wire has an outer periphery coated with an insulator.
An insulated wire according to claim 4 is characterized in that the insulator is a fluororesin.
The insulated wire according to claim 5 is used for wiring for automobiles.

  The wire conductor according to the present invention is made of a fiber core at the center and is flexible, so that an excessive force is not applied to the conductor wire during bending, and the bending resistance is improved and the fiber core absorbs vibration. And vibration resistance can be improved. Moreover, since the center part is comprised with the fiber core, the weight as an electric wire can be reduced. Moreover, since the twist width of the conductor wire is 8 times or more the layer core diameter of the twisted wire, productivity is not lowered. In addition, since the twist width of the conductor wire is not more than 22 times the layer core diameter of the twisted wire, the direction of the stress acting on the conductor wire when bent is close to the angle in the longitudinal direction of the conductor wire. The wire is difficult to break and the bending resistance is improved. In addition, if the conductor wire is arranged so as to completely cover the fiber core, when the insulator is coated on the outer periphery of the electric wire conductor, the insulation element caused by moisture or oil adhering to the fiber core is used. Foaming and rough skin can be prevented. Such an effect of preventing foaming and rough skin of the insulator works particularly effectively when the fluororesin is coated by extrusion. This is because fluororesin has a high extrusion temperature. Such an insulated wire excellent in bending resistance and vibration resistance can be particularly preferably used in automobile wiring in which vibration and repeated bending accompanying it are always applied to the wire.

  The configuration of the present invention will be described below with reference to FIG. For assisting the explanation, FIG. 2 is referred to as a reference drawing. This Embodiment concerns the insulated wire which coat | covered the insulator on the outer periphery of the electric wire conductor.

One fiber core 2 made of glass fiber (575 tex) is arranged at the center. On this outer periphery, twelve conductor strands 3 made of nickel-plated annealed copper wire (0.2 mmφ) are arranged to form a stranded wire 4. Here, the stranded wire 4 is subjected to a circular compression process, and the conductor strand 3 is disposed so as to completely cover the fiber core 2. Here, the layer core diameter is 0.8 mm, the twisted width of the conductor strand 3 is 12.0 mm, and the twisted width of the conductor strand 3 is 15 times the layer core diameter of the twisted wire 4. . A fluororesin is extruded and coated as an insulator 5 with a thickness of 0.35 mm on the outer periphery of the stranded wire 4 to obtain an insulated wire 1. The total cross-sectional area of this insulated wire 1 was 2.27 mm ² .

  Here, the twist width of the conductor wire 3 needs to be not less than 8 times and not more than 22 times the layer core diameter of the twisted wire 4. If it is less than 8 times, the productivity will be very poor and the cost will rise. Further, if the ratio exceeds 22 times, the direction of the stress acting on the conductor wire at the time of bending becomes close to the angle perpendicular to the longitudinal direction of the conductor wire, so that the conductor wire is likely to break and the bending resistance is poor. End up. Furthermore, since part of the fiber core easily protrudes from between the conductor strands, the appearance when viewed by the wire conductor alone is deteriorated, and the outer periphery of the wire conductor is covered with an insulator. Will cause foaming and rough skin of the insulator due to moisture and oil adhering to the fiber core.

  The above-mentioned “twist width” is indicated by L in FIG. 2 and indicates the length required for the conductor wire 3 to go around the outer periphery of the fiber core 2 (the above embodiment). In FIG. 2, there are 12 conductor strands 2, but FIG. 2 schematically shows 6 conductor strands 2). In the present invention, conductor wires may be arranged over a plurality of layers so that another conductor wire is arranged on the outer periphery of the conductor wire, but in this case, the conductor wire in the outermost layer is concerned. Twist width is applied. The above-mentioned “layer core diameter” is indicated by R in FIGS. 1 and 2, and the diameter of a circle formed by connecting the center points of the conductor wires 3 as seen in the cross section of the stranded wire. Show. In the present invention, conductor wires may be arranged over a plurality of layers so that another conductor wire is arranged on the outer periphery of the conductor wire, but in this case, the conductor wire in the outermost layer is concerned. The layer core diameter is applied.

  The insulated wire obtained as described above was subjected to a bending resistance test and a vibration resistance test as the first embodiment. In the bending resistance test, the other end was bent 90 ° to the left and right at a speed of 30 times per minute with one end fixed, and the number of times until the conductor wire was completely cut was confirmed. In the vibration resistance test, one end was fixed and the other end was vibrated at a frequency of 10 Hz and an amplitude of 10 mm, and the time until the conductor wire was completely cut was measured. At the same time, the productivity per unit time and the weight per unit length were measured for productivity evaluation. The test results are shown in Table 1.

  Similarly, with respect to an example in which the relationship between the twist width of the conductor wire and the layer core diameter in the twisted wire is changed, the second embodiment, the third embodiment, the comparative embodiment 1, and the comparison shown in Table 1 are also shown. Also for Form 2, the bending resistance test and the vibration resistance test, the measurement per unit time, and the weight per unit length were measured. Further, in the first embodiment, the same test was performed as a comparative embodiment 3 in which SUS wire (7 wires of 0.2 mmφ was twisted) instead of the fiber core made of glass fiber was used. . These test results are shown together in Table 1.

  As shown in Table 1, the insulated wires according to the first to third embodiments of the present invention have excellent bending resistance and vibration resistance, and are sufficient for the output per unit time, and also excellent in productivity. Met. On the other hand, the comparative form 1 in which the twist width of the conductor wire is less than 8 times the layer core diameter of the twisted wire has a very small output per unit time and is inferior in productivity. Moreover, the comparative form 2 in which the twist width of the conductor wire exceeds 22 times the layer core diameter of the stranded wire has only the same bending resistance as the comparative form 3 using the SUS wire instead of the fiber core. The vibration resistance was also inferior to that of the first to third embodiments. Furthermore, in the comparative form 2, since the fiber core partially protruded from the gap between the conductor wires, foaming occurred in the insulator at the portion where the fiber core protruded. Moreover, all of Examples 1-3 were weight-reduced.

  Further, as the fourth embodiment, in the first embodiment, the twisted wire 4 is not subjected to circular compression processing, and a part of the fiber core 2 protruding from the gap between the conductor strands 3 is created. Foaming occurred in the insulator 4 at the portion where the core 2 protruded. However, when the bending resistance and vibration resistance were measured for the portions where there was no foaming, the test values almost similar to those of the first embodiment were obtained.

  In addition, this invention is not limited to said embodiment. For example, as the fiber core, a known fiber material such as an aramid fiber, a polyester fiber, or a carbon fiber other than the above glass fiber may be appropriately used according to necessary characteristics. Further, the thickness of the fiber and the configuration of the bundle may be set as appropriate.

  As for the conductor wire, in addition to the above-mentioned annealed copper wire, a well-known conductor material such as an aluminum wire, a stainless steel wire, or a material obtained by plating them may be appropriately used according to the required characteristics. Also, the thickness of the wire and the conductor configuration may be set as appropriate. As described above, the conductor strands may be arranged over a plurality of layers so that another conductor strand is placed on the outer periphery of the conductor strand. I do not care.

  As for the insulator, in addition to the fluororesin, a known insulating material such as a vinyl chloride resin, a polyolefin resin, a polyurethane resin, a polyester resin, a polyamide resin, or various elastomer materials may be appropriately used according to the required characteristics. good. Moreover, what is necessary is just to select a construction method suitably, such as extrusion molding and film winding, also when coat | covering. However, in particular, when a material having a high melting temperature such as a fluororesin is coated by extrusion, it is preferable that the conductor wire is disposed so as to completely cover the fiber core. If a part of the fiber core protrudes from between the conductor strands, there is a risk of causing foaming or rough skin of the insulator due to moisture or oil adhering to the fiber core. This is because it occurs remarkably when the value is high.

  As described above in detail, according to the present invention, it is possible to obtain an electric wire conductor that is excellent in bending resistance and vibration resistance and reduced in weight, and an insulated wire using the electric wire conductor. Therefore, the electric wire conductor and the insulated electric wire are useful as electric wires used for wiring of automobiles, industrial robots, electric devices, thermal devices, and the like. In particular, it is optimal as wiring for automobiles.

It is sectional drawing which shows the structure of the insulated wire obtained by embodiment of this invention. It is a partially cutaway perspective view schematically showing an insulated wire obtained by the present invention.

Explanation of symbols

1 Insulated wire 2 Fiber core 3 Conductor wire 4 Stranded wire 5 Insulator L Twist width R Layer core diameter

Claims (5)

In a wire conductor in which a conductor wire is arranged around the fiber core and formed into a stranded wire, the twist width of the conductor wire is 8 to 22 times the layer core diameter of the stranded wire. Characteristic wire conductor. 2. The electric wire conductor according to claim 1, wherein the conductor wire is disposed so as to completely cover the outer periphery of the fiber core. An insulated wire, wherein the outer periphery of the wire conductor according to claim 1 or 2 is coated with an insulator. The insulated wire according to claim 3, wherein the insulator is a fluororesin. The insulated wire according to claim 3 or 4, wherein the insulated wire is used for automobile wiring.

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