Stranded wire

Abstract

To provide a stranded wire in which loosening of strands in a stranded wire can be easily found out, and untwisting is hard to occur.SOLUTION: A stranded wire has: a first outer layer 2 which consists of a plurality of first element wires 11; a second outer layer 3 which consists of a plurality of second element wires 12; a third outer layer 4 which consists of a plurality of third element wires 13; and a hollow part 5 formed inside the third outer layer, where the number of the first element wires 11, the second element wires 12 and the third element wires 13 are the same, the first element wires 11 are disposed so as to be adjacent each other on the same circumference, the third element wires 13 are disposed so as to be adjacent to each other on the same circumference, the second element wires 12 are disposed in an inner valley part 15 which is constituted of the first element wires 11,11 adjacent to each other in the circumferential direction and an outer valley part 16 which is constituted of the third element wires 13,13 adjacent to each other in the circumferential direction, so as to abut on surrounding element wires, and the first element wire 11 and the third element wire 13 do not abut on each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a stranded wire.

Background Art

[0002] In recent years, in the wire and cable market, from the viewpoints of reducing the diameter, weight, and increasing the functionality of wires and cables, a stranded conductor having a cross-section close to a circular shape has been demanded.

[0003] As shown in FIG. 6, with the outer shape of the stranded wire 101 formed to be close to a circular shape, the outer layer 102 is composed of a first outer layer 103, a second outer layer 104 formed inside the first outer layer 103, and a third outer layer 105 formed inside the second outer layer 104. A hollow portion 106 is formed inside the third outer layer 105, and the number of individual wires 103a, 104a, 105a constituting each layer 103, 104, 105 is all the same. In each of the layers 103, 104, 105, the individual wires 103a, 104a, 105a constituting the layer 103, 104, 105 are arranged on the same circumference, and adjacent individual wires are configured to be in contact with each other (see Patent Document 1).

[0004] In addition, since the above-mentioned stranded wire 101 is excellent in flexibility, it has been considered for application as a medical wire such as a guide wire used in treatment.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, during manufacturing or the like, the twisting of the twisted wire 101 may collapse, and the wire 105a constituting the third outer layer may fall into the hollow portion 106. Since the wires 103a and 104a constituting the first outer layer 103 and the second outer layer 104 can stably maintain their shapes, the falling of the wire 105a constituting the third outer layer 105 cannot be visually recognized from the outside, defective products cannot be easily detected, and there is a problem that the inspection cost increases.

[0007] Further, when the twisted wire 101 is applied to a medical wire, the wires 103a, 104a, and 105a need to be made of stainless steel wire, titanium wire, or the like. When the twisted wire 101 is formed of such a wire, the twist-back is likely to occur. When the twist-back occurs, the arrangement positions of the wires 103a, 104a, and 105a are different from the predetermined ones as shown in FIG. 7, and there is a risk of affecting physical properties and the like.

[0008] Therefore, an object of the present invention is to provide a twisted wire that can be easily found when the twisting collapses and is less likely to have a twist-back.

Means for Solving the Problems

[0009] In order to solve the above problems, the present invention has a first outer layer formed by arranging a plurality of first wires in the circumferential direction, a second outer layer provided on the radially inner side of the first outer layer and formed by arranging a plurality of second wires in the circumferential direction, a third outer layer provided on the radially inner side of the second outer layer and formed by arranging a plurality of third wires in the circumferential direction, and a hollow portion formed inside the third outer layer. The number of the first wires, the second wires, and the third wires is the same. The first wires are arranged on the same circumference, and adjacent wires in the circumferential direction are arranged so as to be in contact with each other over the entire axial direction or a part of the axial direction. The second wires are arranged on the same circumference, and adjacent second wires are arranged apart from each other. The third wires are arranged on the same circumference, and adjacent third wires in the circumferential direction are arranged so as to be in contact with each other over the entire axial direction or a part of the axial direction. The second element wire is arranged so as to contact the adjacent first element wires in the inner valley formed by the circumferentially adjacent first element wires, and also contact the adjacent third element wires in the outer valley formed by the circumferentially adjacent third element wires. The first element wire and the third element wire are characterized by not contacting each other.

[0010] Also, the twisted wire may be used as a stranded conductor.

[0011] Also, the twisted wire may be used as a medical wire.

Advantages of the Invention

[0012] According to the present invention, a first outer layer composed of a plurality of first element wires, a second outer layer provided on the radially inner side of the first outer layer and composed of a plurality of second element wires, a third outer layer provided on the radially inner side of the second outer layer and composed of a plurality of third element wires, and a hollow portion formed inside the three outer layers are provided. The first element wire and the third element wire are arranged on the same circumference respectively. The second element wire is arranged so as to be located in the inner valley formed by the adjacent first element wires and the outer valley formed by the adjacent third element wires. Therefore, when the third element wire is twisted and collapses, the shape of the first outer layer also collapses, so that defects can be easily found visually.

[0013] Also, in order to stabilize the shape, even when it is configured using a stainless steel wire, a titanium wire, etc., it is difficult for the wire to untwist.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0015] The mode for carrying out the present invention will be described with reference to the drawings.

[0016] [Example 1] FIG. 1 is a cross-sectional view taken in a direction perpendicular to the axial direction of the stranded wire 1 according to Example 1 of the present invention. The hatching indicating the cross-section of each strand is omitted to avoid complexity of the drawing.

[0017] The stranded wire 1 can be used as a stranded conductor used for electric wires, cables, etc., a catheter tube used for treatment, a guide wire passing through blood vessels, a medical wire such as an operation wire for an endoscope, etc.

[0018] As shown in FIG. 1, the stranded wire 1 is composed of three layers: a first outer layer 2 located radially outermost from its center, a second outer layer 3 provided radially inward from the center of the stranded wire 1 in the first outer layer 2, and a third outer layer 4 provided radially inward from the center of the stranded wire 1 in the second outer layer 3. A hollow portion 5 is formed radially inward from the center of the stranded wire 1 in the third outer layer 4.

[0019] The first outer layer 2 is composed of first strands 11, the second outer layer 3 is composed of second strands 12, the third outer layer 4 is composed of third strands 13, and the stranded wire 1 is composed of three types of strands 11, 12, and 13.

[0020] The first strands 11, the second strands 12, and the third strands 13 are each composed of six strands.

[0021] When the stranded wire 1 is used for a stranded conductor, as the wire materials for the respective strands 11, 12, and 13, for example, copper wires such as bare copper wire, oxygen-free copper wire, linear crystal oxygen-free copper wire, single crystal high-purity oxygen-free copper wire, etc., those obtained by plating such copper wires with tin, nickel, silver, etc., aluminum wires, various alloy wires, and insulated coated ones such as enameled wire, litz wire, and formal wire can be used.

[0022] When the stranded wire 1 is used for a medical wire, as the wire materials for the respective strands 11, 12, and 13, for example, hard copper wire, alloy wire, nickel wire, stainless steel wire, titanium wire, etc. can be used.

[0023] The materials of the respective strands 11, 12, and 13 may be the same material or different materials.

[0024] As shown in FIG. 1, the first outer layer 2 is configured by arranging six first strands 11 on the same circumference. The first outer layer 2 has a circular cross-section and is composed of first strands 11 all having the same diameter. The first strands 11, 11 adjacent to each other in the circumferential direction centered on the center of the stranded wire 1 are arranged so as to be in contact with each other over the entire axial direction or a part of the axial direction.

[0025] As shown in FIG. 1, the second outer layer 3 is configured by arranging six second strands 12 on the same circumference such that the adjacent second strands 12, 12 are spaced apart from each other. The second outer layer 3 has a circular cross-section and is composed of second strands 12 all having the same diameter.

[0026] The second strand 12 is arranged so as to be in contact with the adjacent first strands 11, 11 over the entire axial direction or a part of the axial direction in the inner valley portion 15 formed by the adjacent first strands 11, 11 adjacent to each other in the circumferential direction centered on the center of the stranded wire 1.

[0027] The diameter d2 of the second strand 12 is formed to be smaller than the diameter d1 of the first strand 11.

[0028] As shown in Fig. 1, the third outer layer 4 is formed by arranging six third element wires 13 on the same circumference. The third outer layer 4 has a circular cross-section and is composed of third element wires 13 all having the same diameter. The third element wires 13, 13 adjacent to each other in the circumferential direction centered on the center of the stranded wire 1 are arranged so as to be in contact with each other over the entire axial direction or a part of the axial direction thereof.

[0029] The second element wire 12 is arranged so as to be in contact with the adjacent third element wires 13, 13 over the entire axial direction or a part of the axial direction in the outer valley portion 16 formed by the adjacent third element wires 13, 13 adjacent to each other in the circumferential direction centered on the center of the stranded wire 1.

[0030] The diameter d3 of the third element wire 13 is formed to be smaller than the diameter d2 of the second element wire 12.

[0031] In the first embodiment 1, the respective element wires 11, 12, 13 in which the relationship of d2 = 0.31×d1 and d3 = 0.23×d1 holds are used.

[0032] Further, the cross-sectional shape of the stranded wire 1 is formed to be substantially circular, that is, the distance L1 from the center of the stranded wire 1 to the outermost edge end of each first element wire 11 constituting the first outer layer 2 is made substantially the same. Also, the distance L2 from the center of the stranded wire 1 to the outermost edge end of each second element wire 12 constituting the second outer layer 3 is formed to be substantially the same, and the distance L3 from the center of the stranded wire 1 to the outermost edge end of each third element wire 13 constituting the third outer layer 4 is formed to be substantially the same.

[0033] Since the stranded wire 1 of the present invention has the above structure, it exhibits the following operations and effects.

[0034] The outer shape of the stranded wire 1 can be made substantially circular without compressing it, and the element wires 11, 12, 13 can be in contact with substantially all adjacent element wires 11, 12, 13. Also, the outer shape of the stranded wire 1 can be made substantially circular without compressing it.

[0035] In addition, by configuring the stranded wire 1 as described above, when the third wire 13 that constitutes the third outer layer 4 undergoes twisting collapse or the like inside the hollow portion 5 during the manufacture of the stranded wire 1 or the like, the second outer layer 3 and the first outer layer 2 collapse inward respectively, and their shapes cannot be maintained. Therefore, defects can be easily detected from the outer shape of the stranded wire 1, improving quality, reliability with customers, etc., and reducing quality inspection costs.

[0036] By making the outer shape of the stranded wire 1 into a substantially circular shape without compressing it, each wire 11, 12, 13 has little attenuation of the elongation value, and physical properties such as flexibility and ductility are not impaired, and the physical properties can be maintained. Also, when the inner diameter of the hollow portion 5 is formed large, the shape of the stranded wire 1 can be stably maintained.

[0037] Also, even when the stranded wire 1 is made of a stainless steel wire, a titanium wire, etc., the shape of the stranded wire 1 is stabilized, reverse twisting is less likely to occur, and the stranded wire 1 can be maintained in a predetermined shape and arrangement.

[0038] Therefore, the stranded wire 1 can obtain a highly reliable quality and can be effectively utilized in fields such as automotive wires, audio wires, and medical fields.

[0039] As shown in FIG. 2, even when using each wire 11, 12, 13 in which the relationship of d2 = 0.33 × d1 and d3 = 0.205 × d1 holds, a stranded wire 21 having the same structure, arrangement, etc. as the stranded wire 1 of the above-mentioned Example 1 can be obtained.

[0040] [Example 2] If an arrangement similar to that of the stranded wire 1 of the above-mentioned Example 1 can be formed, the stranded wire 1 can be configured using wires having an arbitrary diameter in addition to the wires having the diameter described in the above-mentioned Example 1. Also, the outermost layer of the stranded wire 1, which is the first outer layer 2, may be compressed by a compression die or the like from the outside.

[0041] Due to this compression, the outer peripheral portion of the first base wire 11 that constitutes the first outer layer 2 is compression-deformed, and the outer shape of the stranded wire 1 can be made closer to a perfect circular shape. The compression by a compression die or the like may be performed when manufacturing the stranded wire 1, or may be performed after manufacturing the stranded wire 1. Note that the compression ratio is set arbitrarily.

[0042] Since other structures are the same as those in the above-described first embodiment, the description thereof is omitted.

[0043] Also in the second embodiment, the same operational effects as those in the first embodiment can be exhibited.

[0044] [Embodiment 3] In the above-described first and second embodiments, the stranded wire 1 is composed of six first base wires 11, six second base wires 12, and six third base wires 13, respectively. However, if the numbers of the first base wire 11, the second base wire 12, and the third base wire 13 are the same, the numbers of the base wires 11, 12, and 13 can be set to any numbers, respectively.

[0045] The first base wire 11, the second base wire 12, and the third base wire 13 are arranged with the same regularity as in the above-described first and second embodiments.

[0046] For example, as shown in FIG. 3, in the case of the stranded wire 22 composed of eight first base wires 11, eight second base wires 12, and eight third base wires 13, respectively, by using the base wire for each of the base wires 11, 12, and 13 for which the relationships of d2 = 0.38 × d1 and d3 = 0.34 × d1 hold, the cross-sectional shape of the stranded wire 22 can be made substantially circular at a non-compressed or low compression rate.

[0047] Also, as shown in FIG. 4, in the case of the stranded wire 23 composed of nine first base wires 11, nine second base wires 12, and nine third base wires 13, respectively, by using the base wire for each of the base wires 11, 12, and 13 for which the relationships of d2 = 0.41 × d1 and d3 = 0.385 × d1 hold, the cross-sectional shape of the stranded wire 23 can be made substantially circular at a non-compressed or low compression rate.

[0048] Also, as shown in Fig. 5, in the case of the stranded wire 24 composed of 14 first element wires 11, 14 second element wires 12, and 14 third element wires 13 respectively, by using the wire materials that form the basis of the respective element wires 11, 12, and 13 for which the relationships d2 = 0.485×d1 and d3 = 0.545×d1 hold, the cross-sectional shape of the stranded wire 24 can be made substantially circular with non-compression or a low compression ratio.

[0049] Since other structures are the same as those in the above-described first and second embodiments, the description thereof is omitted.

[0050] Also in the third embodiment, the same operational effects as those in the above-described first and second embodiments can be exhibited.

Explanation of reference numerals

[0051] 1, 21, 22, 23, 24 stranded wire 2 first outer layer 3 second outer layer 4 third outer layer 5 hollow part 11 first element wire 12 second element wire 13 third element wire

Claims

1. A first outer layer formed by arranging a plurality of first element wires in the circumferential direction, a second outer layer provided on the radially inner side of the first outer layer and formed by arranging a plurality of second element wires in the circumferential direction, a third outer layer provided on the radially inner side of the second outer layer and formed by arranging a plurality of third element wires in the circumferential direction, and a hollow portion formed inside the third outer layer, The number of the first element wires, the second element wires, and the third element wires are all the same, The first element wires are arranged on the same circumference, and adjacent element wires in the circumferential direction are arranged so as to contact each other over the entire axial direction or a part of the axial direction, The second element wires are arranged on the same circumference, and adjacent second element wires are arranged spaced apart from each other, The third element wires are arranged on the same circumference, and adjacent third element wires in the circumferential direction are arranged so as to contact each other over the entire axial direction or a part of the axial direction, The second element wires are arranged so as to contact the adjacent first element wires in the inner valley portion formed by the adjacent first element wires in the circumferential direction and to contact the adjacent third element wires in the outer valley portion formed by the adjacent third element wires in the circumferential direction, A stranded wire, characterized in that the first element wire and the third element wire do not contact each other.

2. The stranded wire according to Claim 1, characterized in that the stranded wire is used as a stranded conductor.

3. The stranded wire according to Claim 1, characterized in that the stranded wire is used as a medical wire.

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