JP2015057787A - Stranded wire conductor for insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stranded wire conductor for an insulated wire which has an approximately circular cross-sectional shape and does not deteriorate flexural properties.SOLUTION: In a stranded wire conductor for an insulated wire which comprises an inner layer comprising a central wire 1 and a plurality of wires arranged around the central wire 1 and an outer layer comprising a plurality of wires arranged around the inner layer, the inner layer comprises 7 or more second wires 2a having a diameter smaller than that of the central wire 1, the adjacent second wires 2a are brought into contact with each other, and the plurality of wires composing the outer layer have a diameter smaller than that of the central wire 1.

Description

  The present invention relates to a stranded wire conductor for insulated wires.

  A twisted conductor for an insulated wire generally has a shape in which 7 or 19 core wires having the same diameter are twisted, and therefore the cross section of the entire conductor is generally hexagonal (11 and 19 core wires in FIG. 4). A model cross-sectional view of a covered electric wire provided with a conductor is shown). However, for such a conductor having a substantially hexagonal cross section, the outer peripheral shape of the covering layer 12 is desired to be a perfect circle in order to facilitate wiring and stabilize quality characteristics. For this purpose, the coating layer is formed with a thick portion other than the portion necessary for obtaining durable insulation performance (the portion shown by hatching in FIG. 4). An increase in weight has caused a high-cost factor that hinders the weight reduction of an electric wire, which is essential for an electric wire for an automobile, and wastes an insulating material.

  In order to improve such drawbacks, in Japanese Patent Application Laid-Open No. 2007-317477 (Patent Document 1), as shown in model form in FIG. 5, around the inner layer portion composed of seven central strands 13. Using three types of strands having different diameters, a strand thicker than the central strand 13 (thick strand 14) and a strand thinner than the central strand 13 (thin strand 15), A technique has been proposed in which the cross section of the line conductor is substantially circular.

  However, in the technology, since the large-diameter strand 14 thicker than the central strand 13 is arranged in the outer layer, the bending characteristics are deteriorated particularly when the cord is arranged in a portion bent by the electric wire for an automobile. There was a drawback.

JP 2007-317477 A

  An object of the present invention is to provide a stranded wire conductor for an insulated wire whose cross-sectional shape is close to a circle without improving the above-described conventional problems, that is, without causing deterioration in bending characteristics.

  In order to solve the above problems, a stranded wire conductor for an insulated wire according to the present invention has a center strand, an inner layer composed of a plurality of strands arranged around the center strand, and In the insulated wire stranded conductor composed of an outer layer composed of a plurality of strands arranged around the inner layer, the inner layer is seven or more second strands thinner than the thickness of the central strand. The plurality of strands that are composed of lines and that constitute the outer layer are thinner than the thickness of the central strand.

  The insulated wire stranded conductor of the present invention is the insulated wire stranded wire conductor according to claim 1, wherein the number of second strands is the same as the number of second strands of the inner layer. Lines are arranged in the outer layer.

  Moreover, the twisted wire conductor for insulated wires of the present invention is the twisted wire conductor for insulated wires according to claim 2, wherein the third strand is the two adjacent second wires of the outer layer. It arrange | positions between 2 strands, It is characterized by the above-mentioned.

  Moreover, the twisted wire conductor for insulated wires of the present invention is the twisted wire conductor for insulated wires according to claim 3, wherein the strands of the inner layer and the strands of the outer layer are in the same direction. It is characterized by being twisted.

  Moreover, the twisted wire conductor for insulated wires according to the present invention is the twisted wire conductor for insulated wires according to claim 3 or 4, wherein the number of second strands of the outer layer The number of third strands of the outer layer is both equal to the number of second strands of the inner layer.

  Moreover, the twisted wire conductor for insulated wires of the present invention is the twisted wire conductor for insulated wires according to any one of claims 3 to 5, wherein the second layer constituting the outer layer is as described in claim 6. The sum of the cross-sectional areas of the element wire and the third element wire is 50% or more of the entire cross-sectional area of the stranded wire conductor for insulated wires.

  According to the stranded wire conductor for insulated wires of the present invention, since the stranded wire conductor for insulated wires having a nearly circular cross-sectional shape is obtained without deteriorating the bending characteristics, there is no uneven thickness of the insulating layer, and the raw material There is no waste, it is economical, lightweight, and an insulated electric wire having a diameter smaller than the capacity can be obtained, and a covered electric wire that can be used very suitably in the field of electric wires for automobiles can be obtained. Moreover, the stranded wire conductor for insulated wires excellent in bending resistance can be obtained.

  Moreover, according to the twisted wire conductor for insulated wires according to claim 2, the outer diameter of the twisted wire conductor can be made as small as possible and the collapse can be prevented from occurring.

  Further, according to the stranded wire conductor for insulated wires according to claim 3, since the gap between the strands can be reduced while keeping the entire cross section substantially circular, the thickness unevenness of the insulating layer is further reduced. Therefore, it is possible to obtain an insulated wire having a smaller diameter than the capacity.

  Further, according to the stranded wire conductor for insulated wires according to claim 4, the contact between the strands is stable, and the gap between the strands is reduced, so that the maximum outer diameter can be made as small as possible. Further, since the shape is not unstable due to twisting, a product having a stable shape can be manufactured.

  Moreover, according to the stranded wire conductor for insulated wires according to claim 5, since the strands can be inserted into the gap inevitably generated between the strands of the inner layer, the capacity can be effectively improved, Alternatively, the outer diameter can be reduced.

  Moreover, according to the twisted wire conductor for insulated wires of Claim 6, the number of contact strands with a crimp terminal increases, and connection reliability improves.

  That is, the main point for reducing the contact resistance is how to smooth the flow of electricity. If the number of strands in contact with the crimping terminal is large, the flow of electricity will be smooth, but if the number of strands is increased in order to improve the bending performance, it will be arranged in the outermost layer with the conventional technology The number of strands will decrease. However, according to the stranded wire conductor for insulated wires according to the present invention, the number of contact wires with the crimp terminal is increased as described above, and the connection reliability can be improved.

FIG. 1 is a model diagram showing a cross section of a stranded wire conductor A for insulated wires according to the present invention. FIG. 2 is an explanatory diagram for explaining the thickness and arrangement of each strand of the stranded wire conductor A for insulated wires. FIG. 3 is a model cross-sectional view showing an example of another insulated wire stranded conductor according to the present invention. FIG. 4 is a model diagram showing an example of an insulated wire according to the prior art. FIG. 5 is a model diagram showing an example of a stranded wire conductor for insulated wires according to the prior art.

  As described above, the stranded wire conductor for an insulated wire according to the present invention is arranged around a central strand, an inner layer composed of a plurality of strands arranged around the central strand, and around the inner layer. In the insulated wire stranded conductor composed of an outer layer composed of a plurality of strands, the inner layer is composed of seven or more second strands that are thinner than the thickness of the central strand, and the outer layer The stranded wire conductor for insulated wires is characterized in that the plurality of strands constituting the wire are thinner than the thickness of the central strand.

  Examples of the stranded wire conductor for insulated wires of the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing a stranded wire conductor A for insulated wires according to the present invention. There is a central element wire 1 at the center, and around the seven second element wires 2a are in contact with the center element wire 1, and adjacent second element wires 2a are in contact with each other to form an inner layer 4 Is formed.

  A second strand 2b (same as the second strand 2a constituting the inner layer 4) and a third strand are disposed around the inner layer 4 composed of the seven second strands 2a. The outer layer 5 is formed by alternately arranging 3 and 3.

  The second strand 2b of the outer layer 5 is in contact with the adjacent second strands 2a of the inner layer. With this configuration, the number of second strands 2b in the outer layer 5 is equal to the number of second strands 2a in the inner layer 4, and is seven in this example.

  Further, a third element wire is arranged on both sides of the second element wire 2b in the outer layer 5. The third element wire is a circle circumscribing all the second element wires of the inner layer and the outer layer. It touches the second strand 2b on both sides in the outer layer 5 arranged in contact with the circle circumscribing all the second strands.

  Further, the third strand of the outer layer includes a circle circumscribing all the second strands of the inner layer (C1 in FIG. 2) and a circle circumscribing all of the second strands of the outer layer (C2 in FIG. 2). It is arranged in contact with.

When such arranged strands, the first radius of the strand 1 d _1, the radius of the second wire 2a and 2b d _2, the diameter of the third strand 3 and d _3, the inner layer When the number of strands of n is n and θ = 180 ° / n, the following equation (1) is established.

[Equation 1]
d ₂ = (d ₁ + d ₂ ) sin θ (1)

In equation (1), if the number n of strands is 7 and the diameter (2d ₁ ) of the first strand 1 is 0.37 mm, the diameter (2d ₂ ) of the second strands 2a and 2b is 0.284 mm. Become.

  Further, the radius L1 of the circle C2 circumscribing all the second strands of the outer layer is obtained by the following equation (2).

[Equation 2]
L1 = (d ₁ + d ₂ ) cos θ + 2d ₂ sin 60 ° + d ₂ (2)

On the other hand, since L1 is equal to the radius L2 of the circle circumscribing all the third strands of the outer layer, that is, d ₁ + 2d ₂ + 2d ₂ ), the following formula (3) is established, and the diameter of the third strand (2d ₃ ) is 0.213 mm.

[Equation 3]
2d ₃ = (d ₁ + d ₂ ) cos θ + 2d ₂ sin 60 ° + d ₂ −d ₁ −2d ₂
...... (3)

Furthermore, at this time, the thickness 2L1 (= 2L2) of the stranded wire conductor for insulated wires is 1.36 mm, the overall cross-sectional area is 1.24 mm ² , and the cross-sectional area of the outer layer is 0.691 mm ² . The sum of the cross-sectional areas of the element wire and the third element wire is 55.7% of the cross-sectional area of the entire stranded wire conductor for insulated wires.

  With such a configuration, in the strands constituting the stranded conductor A for insulated wires, the strands thicker than the central strand 1 are not in the inner layer and the outer layer, and further, the strands thicker than the strands in the inner layer are not in the outer layer. Therefore, a stranded wire conductor for an insulated wire having a substantially circular cross section can be obtained without deteriorating bending characteristics. For this reason, when an insulating layer is provided, there is no thickness unevenness, there is no waste of raw materials, it is economical, lightweight, and an insulated wire having a diameter smaller than the capacity can be obtained. It is possible to obtain a covered electric wire that can be used very suitably in the field. Furthermore, such a stranded wire conductor for an insulated wire is arranged such that the strands are always in contact with each other by twisting the inner layer and the outer layer in the same direction. With such a structure, the contact between the strands is stabilized and the gap between the strands is reduced, so that the maximum outer diameter can be made as small as possible. Further, since the shape is not unstable due to twisting, a product having a stable shape can be manufactured.

  Furthermore, in this example, since the sum of the cross-sectional areas of the second strand and the third strand constituting the outer layer is 55.7% of the cross-sectional area of the entire stranded wire conductor for insulated wires, Good electrical contact.

  In the above, an example in which seven second strands are arranged in the inner layer is shown, but FIG. 3 shows an example B in which eight second strands are arranged in the inner layer.

At this time, if the diameter of the central strand is 0.37 mm, the diameter of the second strand is 0.229 mm, the diameter of the third strand is 0.175 mm, the diameter of the circumscribed circle is 1.18 mm, The cross-sectional area is 0.856 mm ² , the cross-sectional area of the outer layer is 0.459 mm ² , and the sum of the cross-sectional areas of the second and third strands constituting the outer layer is the entire stranded conductor for insulated wires. 53.6% of the cross-sectional area.

  As the strands constituting the stranded wire conductor for insulated wires of the present invention, an annealed copper wire is generally used, but it is used as a conductor such as a tin-plated annealed copper wire, a strand made of pure aluminum, or an aluminum alloy. Anything can be used.

  Moreover, the insulated wire for insulated wires of this invention can provide an insulating layer in the circumference | surroundings by extrusion molding etc. like the conventional twisted wire conductor.

1 Central strand 2a Second strand (inner layer)
2b Second strand (outer layer)
3 3rd strand A, B The stranded wire conductor for insulated wires which concerns on this invention

Claims (6)

For an insulated wire composed of a central element wire, an inner layer composed of a plurality of element wires arranged around the center element wire, and an outer layer composed of a plurality of element wires arranged around the inner layer In stranded conductors,
The inner layer is composed of seven or more second strands thinner than the thickness of the central strand, and
The stranded wire conductor for an insulated wire, wherein the plurality of strands constituting the outer layer are thinner than a thickness of the central strand.   2. The stranded wire conductor for insulated wires according to claim 1, wherein the same number of second wires as the second wires of the inner layer are arranged in the outer layer.   The stranded wire conductor for an insulated wire according to claim 2, wherein the third strand is disposed between two adjacent second strands of the outer layer.   The insulated wire stranded conductor according to claim 3, wherein the inner layer strand and the outer layer strand are twisted in the same direction.   5. The number of second strands of the outer layer and the number of third strands of the outer layer are both equal to the number of second strands of the inner layer. Stranded conductor for insulated wires.   The sum of the sectional areas of the second strand and the third strand constituting the outer layer is 50% or more of the sectional area of the entire stranded wire conductor for insulated wires. The stranded wire conductor for insulated wires according to claim 5.

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