JPH09237522A - Wire cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the tensile strength and bending fatigue resistance, eliminate the braiding process of strands and use intertwisting only, and reduce the cost by using the copper-iron alloy strands containing a proper quantity of copper. SOLUTION: A strand (a) is molded with a copper-iron alloy containing copper of 50-70%, multiple strands are intertwisted, and the outer periphery is covered with an insulator (b) of a synthetic resin to obtain a copper-iron alloy electric wire. The tensile strength of this electric wire is about two times that of a copper wire, it has strong tensile strength, and it can bear tensile force. Its fatigue-resistant strength is two times that of the copper wire or above, and an operation stop accident caused by fatigue breakage can be prevented. Its bending radius is a half of that of the copper wire or below, and the wiring space can be reduced. Multiple strands (a) are intertwisted to form the electric wire, no troublesome braiding process is required, it can be manufactured at a low cost, it is excellent in bending fatigue resistance, and it is advantageous in view of the earthquake resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire cable used for transmission of control signals and the like.

[0002]

2. Description of the Related Art A conventional electric cable of this type has a large number of conductors housed in a sheath. As the conductor, in order to reduce bending stress, an element wire made of a thin copper wire (for example, a diameter of 80 μm) is used. The outer periphery is braided, and the core material ensures high tensile strength and bending fatigue resistance.

[0003]

However, in the electric wire cable in which the wire made of an extremely thin copper wire is braided around the outer periphery of the core material, the structure thereof is complicated and the manufacturing cost becomes high. The present invention focuses on this point, and an object thereof is to provide an electric wire cable which has excellent tensile strength and bending fatigue resistance, and has a simple structure and can be manufactured at low cost. is there.

[0004]

In order to achieve such an object, the present invention uses copper in an amount of 50 to 7 as an electric conductor.
An electric wire cable is configured by using a plurality of element wires made of a copper-iron alloy containing 0% by weight. Then, the plurality of strands are twisted together in a stranded wire structure of, for example, 1 × 6, 1 × 19 or the like.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of an electric wire cable according to an embodiment of the present invention. In this electric wire cable, six strands a are used as electric conductors.

The material of each element wire a is copper (Cu).
It is a copper-iron alloy (Cu-Fe) containing 70% to 70% and has a relatively large diameter, for example, about 0.5 to 1.0 mm or about 2.0 mm.

These strands a are twisted together into, for example, a 1 × 6 stranded wire structure, and the outer periphery thereof is covered with an insulator b made of synthetic resin or the like. The copper wire (C
u) and copper-iron alloy wire (Cu-Fe) are shown in comparison with each other. The material of the copper-iron alloy wire shown in this table is a copper-iron alloy containing 50% of copper (Cu). The physical properties of the steel wire are also shown in this table for reference.

[0008]

[Table 1]

[0009] As shown in this table, when the tensile strength of the copper wire while is 400 N / mm ^2, in the case of copper-iron alloy wire is 800 N / mm ^2, 2-fold Has tensile strength,
It is possible to bear a strong tension against a tensile load.

Further, as is clear from the comparison of the characteristics of the yield point and the allowable bending strain, the fatigue resistance strength is 2 compared with the copper wire.
It is more than double, and it is possible to prevent an accident such as an outage due to fatigue disconnection.

Further, as is clear from the comparison of the characteristics of the permissible bending strain, the bending and bending radius can be reduced to one half or less of that of the copper wire, so that the wiring space can be narrowed.

In the present invention, a relatively thick wire made of a copper-iron alloy having excellent tensile strength and bending fatigue resistance is used, and a plurality of such wires are twisted together to form an electric cable. Therefore, there is no need for a troublesome braiding process as in the prior art, it can be manufactured at low cost, and it is particularly advantageous in terms of earthquake resistance because it is excellent in bending fatigue resistance.

When the cable is used for driving a motor or the like, a relatively large current flows through the cable, so that it is necessary to reduce the resistance of the cable. In order to reduce the resistance, it is necessary to thicken the wires that compose the cable and increase the cross-sectional area, but this must be achieved by means of braiding many extremely thin wires, as in the past. However, it can be easily realized in a structure in which thick wires are twisted together as in the present invention.

When the cross-sectional area of the wire is the same (for example, 3.5 mm ² ), the electric resistance of the copper-iron alloy wire is five times as high as that of the copper wire, but the total length of the cable which is repeatedly and repeatedly moved is 100.
If it is about m, the total resistance of the cable alone is 2.86 / 3.5mm ² × 100m = 2.46Ω. If the insertion resistance of the circuit is about 1 KΩ, the voltage drop of the cable is +5 to 24V x 2.46 / (1000 + 2.46) = 0.012 to 0.059V (0.25%) when the power supply is +5 to 24V, which is a very small amount. There is no problem with.

Even if the cross-sectional area is 0.30 mm ² , the resistance is 28.7
Ω, the voltage drop is 0.14 to 0.67V (2.8%), and the signal is ON.
-OFF operation is not affected. Allowable current is 1 / √5 of copper wire =
It remains at 0.45 or 45%, but this kind of cable is usually used within this range, so there is no problem. The present invention is not limited to the case where the strand has a 1 × 6 stranded wire structure,
For example, any structure such as a 1 × 19 stranded wire structure can be selected.

[0016]

As described above, in the electric wire cable of the present invention, as the electric conductor, a wire made of a copper-iron alloy containing 50 to 70% by weight of copper is used. In addition to being excellent in bending fatigue resistance,
It is possible to manufacture at low cost by adopting a simple structure in which the strands are twisted together in a stranded wire structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electric wire cable according to an embodiment of the present invention.

[Explanation of symbols]

 a ... strand b ... insulator

Claims (2)

[Claims] 1. Copper as an electric conductor in an amount of 50 to 70% by weight.
An electric wire cable comprising a plurality of element wires made of a contained copper-iron alloy. 2. Copper as an electric conductor in an amount of 50 to 70% by weight.
An electric wire cable characterized in that a plurality of elemental wires made of contained copper-iron alloy are used, and these elemental wires are twisted together to form a twisted structure.