JP2010102878A - Cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance bendability in a cable provided with a flat conductor part. <P>SOLUTION: The cable is provided with: a conductor part 12 formed in a flat linear shape as a whole by collecting a plurality of wires 14 on a non-coplanar surface while contacting with each other; and a coating part 20 covering the outer circumference of the conductor part 12. The conductor part is provided with a plurality of strands 16 obtained by stranding the plurality of wires, which are juxtaposed on a substantially coplanar surface so as to contact with each other. The conductor part is also provided with a plurality of layers in which each assembly of a plurality of element wires juxtaposed on a substantially coplanar surface is provided further so as to contact with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cable in which a coating is formed around a flat conductor portion.

  Conventionally, as a flat cable provided with a flat conductor portion, there are those disclosed in Patent Document 1 and Patent Document 2.

  Patent document 1 is disclosing the flat cable using the flat conductor which is a flat wire shape.

  Patent Document 2 discloses a flat cable in which a plurality of conductors arranged adjacent to each other in parallel are surrounded by an insulator.

JP 2002-343141 A Japanese Utility Model Publication No. 5-6539

  However, the techniques disclosed in Patent Documents 1 and 2 have a problem in that the cross-sectional area of each conductor tends to be large, resulting in poor flexibility.

  Therefore, an object of the present invention is to improve the flexibility in a cable having a flat conductor portion.

  The cable which concerns on a 1st aspect gathers on the non-coplanar surface in the state which the some strand contacted mutually, and the coating | coated part which covers the outer periphery of the said conductor part formed in the flat line shape as a whole It is equipped with.

  A 2nd aspect is a cable which concerns on a 1st aspect, Comprising: The said conductor part is arrange | positioned in parallel on substantially the same plane so that the multiple twisted wires which twisted the said strand several times may mutually contact It is.

  A 3rd aspect is a cable which concerns on a 1st aspect, Comprising: The said conductor part is provided with two or more layers so that what the said strand arranged in parallel on substantially the same plane may further contact mutually It is.

  A 4th aspect is a cable which concerns on any one 1st-3rd aspect, Comprising: The surface of the said coating | coated part is formed in uneven | corrugated shape.

  A 5th aspect is a cable which concerns on any one 1st-4th aspect, Comprising: The diameter of the said strand shall be 0.05 mm-0.60 mm.

  According to the cable according to the first aspect, the conductor portions are assembled on a non-coplanar surface in a state where a plurality of strands are in contact with each other, and are configured to be formed into a flat linear shape as a whole. The cross-sectional area of the element wire can be reduced, and the flexibility can be improved.

  According to the 2nd aspect, since a conductor part can be formed with the twist line which is easy to handle, it is convenient on a manufacturing process. Moreover, since the strands twisted together can be stretched so as to eliminate the twist, they are more excellent in flexibility.

  According to the 3rd aspect, since the conductor part is formed using a strand, cost reduction and resistance reduction can be anticipated.

  According to the 4th aspect, the surface area of a coating | coated part becomes large by uneven | corrugated shape, and it is excellent in heat dissipation.

  According to the 5th aspect, since the diameter of a strand is 0.60 mm or less, it is excellent in flexibility. Moreover, since the diameter of a strand is 0.05 mm or more, it is excellent in the handleability at the time of manufacture.

{First embodiment}
Hereinafter, the cable according to the first embodiment will be described. FIG. 1 is a cross-sectional view showing a cable 10 according to the first embodiment.

  The cable 10 includes a conductor portion 12 and a covering portion 20.

  The conductor portion 12 has a plurality of (here, five) stranded wires 16.

  The stranded wire 16 is obtained by twisting a plurality (7 in this case) of the strands 14 formed of a metal wire such as copper or a copper alloy. The cross-sectional shape of the strand 14 is preferably substantially circular. The diameter of the strand 14 can be appropriately set according to required electrical characteristics. Further, it is not necessary that all the strands 14 have the same diameter. For example, the diameter of the central strand 14 may be larger than the diameter of the surrounding strand 14. But the preferable range of the diameter of the strand 14 is 0.05 mm-0.60 mm. This is because, as will be described later, when the diameter of the wire 14 is 0.60 mm or less, the wire 14 can be excellent in flexibility. Moreover, it is because the handleability at the time of manufacture is excellent because the diameter of the strand 14 shall be 0.05 mm or more. The plurality of stranded wires 16 are arranged in parallel on substantially the same plane so that adjacent ones are in contact with each other, and the plurality of stranded wires 16 constitute the conductor portion 12 as one linear conductor as a whole. ing. In addition, the part which the adjacent twisted wires 16 do not partially contact in the longitudinal direction may arise for the convenience on twisted shape. That is, the adjacent twisted wires 16 may be in contact as a whole in the longitudinal direction and can be handled as one conductor as a whole. In the conductor portion 12 configured as described above, a plurality of (14 in total, 7 × 5, 35) strands 14 constituting the conductor portion 12 are adjacent to each other. Moreover, each strand 14 exists in the position which varied in the thickness direction of the conductor part 12 according to the twist position in the twist line 16, and has become the form assembled | stacked on the non-coplanar surface. And as a whole, it is formed in the linear shape which becomes flat along the parallel arrangement direction of the twisted wire 16.

  The covering portion 20 is made of an insulating material such as resin and is provided so as to cover the outer periphery of the conductor portion 12. Here, the covering portion 20 is formed so as to cover the outer periphery of a plurality (here, three) of the conductor portions 12 arranged in parallel on the substantially same plane with a space therebetween. The covering portion 20 may be formed by extruding and coating a resin around the conductor portion 12, or formed by sandwiching the conductor portion 12 between a pair of insulating films. It may be. In short, what is necessary is just the structure which can aim at the insulation protection from the outside in the state which maintained the conductor part 12 with the predetermined form.

  The number of the stranded wires 16 and the number of the strands 14 of the stranded wires 16 may be arbitrarily set according to required electrical characteristics and the like.

  The cable 10 is formed in a flat cable shape that is flat in the parallel arrangement direction of the plurality of conductor portions 12 (the flat direction of the conductor portions 12).

  According to the cable 10 configured as described above, the conductor portion 12 is assembled on a non-coplanar surface in a state in which the plurality of strands 14 are in contact with each other, and is configured to be formed as a flat wire as a whole. Therefore, the diameter of each strand 14 can be reduced. Specifically, the diameter of the strand 14 can be made smaller than the dimension of the conductor portion 12 in the thickness direction. Thereby, the cross-sectional area of each strand 14 which comprises the conductor part 12 can be made small, and distortion when bent can be made small. Thereby, the outstanding flexibility which is hard to be disconnected by repeated bending can be obtained. Further, the cable 10 can be bent and routed easily with a small bending radius. Moreover, since the conductor part 12 is formed in the flat linear shape as a whole, the surface area of the conductor part 12 can be enlarged as much as possible. Thereby, the heat dissipation of the conductor part 12 can be made favorable, and the allowable current improvement of the conductor part 12 can be aimed at by extension.

  Moreover, since the conductor part 12 comprised as the aggregate | assembly of the some strand 14 does not have a substantially perpendicular | vertical corner | angular part like the flat conductor which is a substantially square cross section, when the cable 10 is bent However, damage to the covering portion 20 can be prevented.

  Furthermore, since a general strand 14 can be used without using a flat conductor that has been flattened by a separate process, the cost can be reduced.

  Moreover, since each conductor part 12 is formed of the stranded wire 16 that is easy to handle in the manufacturing process, it is convenient in the manufacturing process.

  In addition, since the twisted strands 14 can be stretched so as to eliminate the twist, the stress acting on each strand 14 when the cable 10 is bent can be relieved by the amount that the strand 10 can be stretched and deformed. it can. For this reason, it can be made more excellent in flexibility.

{Second Embodiment}
A cable according to the second embodiment will be described. FIG. 2 is a cross-sectional view showing a cable 110 according to the second embodiment.

  The cable 110 includes a conductor portion 112 and a covering portion 120.

  The conductor portion 112 is configured such that a plurality of strands 114 arranged in parallel on substantially the same plane are provided in a plurality of layers so as to be in contact with each other.

  The strand 114 has the same configuration as the strand 14. A plurality of such strands 114 (here 18) are arranged in parallel on the same plane so that adjacent ones are in contact with each other, thereby forming a single strand parallel group 115. Yes. Further, a plurality of layers (here, three layers) are provided so that the strand parallel groups 115 are in contact with each other between adjacent ones. In the conductor portion 112 configured as described above, a plurality of (here, 18 × 3, a total of 54) strands 114 constituting the conductor portion 112 are in contact with each other. Each strand 114 is provided over a plurality of layers, so that the strands 114 are disposed at positions that vary in the thickness direction of the conductor portion 112 and are aggregated on non-coplanar surfaces. And as a whole, it forms in the linear form which becomes flat along the parallel direction of the strand 114 in each layer.

  Note that the number of layers and the number of wires 114 in each layer may be arbitrarily set according to the required electrical characteristics and the like.

  The covering portion 120 is provided so as to cover the outer periphery of the conductor portion 112. Here, the covering portion 120 is formed so as to cover the outer periphery of a plurality (here, three) of the conductor portions 112 that are arranged in parallel on the substantially same plane with a space therebetween. Other configurations regarding the covering portion 120 are the same as those of the covering portion 20.

  The cable 110 is formed in a flat cable shape that is flat in the parallel arrangement direction of the plurality of conductor portions 112 (the flat direction of the conductor portions 112).

  According to the cable 110 configured as described above, as in the first embodiment, the plurality of strands 114 are assembled on a non-coplanar surface in a state of mutual contact, and formed as a flat wire as a whole. Since it is set as the structure, the diameter of each strand 114 can be made small. Specifically, the diameter of the strand 114 can be made smaller than the dimension in the thickness direction of the conductor portion 112 (about 1/3 here). Thereby, the cross-sectional area of each strand 114 which comprises the conductor part 112 can be made small, and distortion when bent can be made small. Thereby, the outstanding flexibility which is hard to be disconnected by repeated bending can be obtained. In addition, the cable 110 can be bent and routed with a small bending radius. Moreover, since the conductor part 112 is formed in the flat linear shape as a whole, the surface area of the conductor part 112 can be enlarged as much as possible. Thereby, the heat dissipation of the conductor part 112 can be made favorable, and the allowable current improvement of the conductor part 112 can be aimed at by extension.

  In addition, the conductor portion 112 configured as an assembly of a plurality of strands 114 does not have a substantially right-angled corner portion unlike a flat conductor having a substantially rectangular cross section, and thus the cable 110 is bent. However, damage to the covering portion 120 can be prevented.

  Further, since a general element wire 114 can be used without using a flat conductor (also referred to as a flat conductor) flattened by a separate process, cost reduction can be achieved.

  Further, since the conductor portion 112 is formed by providing a plurality of strand parallel groups 115 in which a plurality of strands 114 are arranged in parallel on substantially the same plane, the length dimension of each strand 114 is set to the length of the cable 110. It can be substantially the same as the length dimension. As a result, the length of the element wire 114 does not need to be longer than necessary, so that the cost can be reduced, the resistance can be reduced, the heat generation during current flow can be suppressed, and the allowable current can be improved. be able to.

  In addition, between the strand parallel groups of each layer, each strand does not need to be aligned in the width direction of the strand parallel group. For example, in each layer, the strand may be disposed at a position shifted by the radius of the strand of the adjacent layer. That is, in each layer, the strands may be disposed on the extension between the strands of adjacent layers. Thereby, it can be set as the structure which carried out the closest packing arrangement | positioning of the circular cross section of each strand in the cross-section plane of a cable, and can make a conductor part and a cable thin.

{Modifications}
FIG. 3 shows a cable 210 according to a modification of the first embodiment. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals as above.

  In this modification, concave portions 222 a and 222 b are formed on the surface of the covering portion 220. Here, recesses 222 a along the longitudinal direction of the cable 210 are formed at positions corresponding to the conductor portions 12. In addition, a concave portion 222b having a substantially triangular groove shape in section along the longitudinal direction of the cable 210 is formed at a position corresponding to between the stranded wires 16 in each conductor portion 12. Thereby, the surface area of the coating | coated part 220 can be enlarged, and the heat which generate | occur | produced in the conductor part 12 can be spread | diffused outside more efficiently. In addition, since the recesses 222a and 222b along the longitudinal direction of the cable 210 are formed in accordance with the outer peripheral shape of the conductor part 12, and the arrangement mode of the plurality of conductor parts 12, the insulating member for the conductor part 12 is formed. As described above, the heat dissipation can be improved while keeping the thickness dimension substantially the same.

  But the position and shape of a recessed part are not restricted to the said example. The surface of the covering portion may be formed in an uneven shape in various shapes. This is because the surface area of the covering portion can be increased to improve heat dissipation. Of course, this modification can also be applied to the second embodiment. In this case, it is good to form a recessed part in the position corresponding between each conductor part 12. FIG.

  Moreover, although each said embodiment demonstrated in the example provided with the several conductor parts 12 and 112, the structure provided with the one conductor parts 12 and 112 may be sufficient.

  Further, the assembly form of the strands 14 and 114 is not limited to the example of the above embodiment. For example, a form in which a plurality of strands are assembled so as to have a flat linear shape having a thickness dimension equal to or larger than the diameter of the strands without regularity may be employed. In short, it is only necessary that the plurality of strands 14 and 114 are assembled on a non-coplanar surface in a state where they are in contact with each other and formed as a flat line as a whole.

  An experiment was conducted on the relationship between the diameter of the wire and the flexibility.

  The experimental conditions of the bending test are as follows. That is, as shown in FIG. 4, one end of a 300 mm long strand Wa was fixed to a rotating arm or the like, and a weight 310 was hung from the other end of the strand Wa. As the weight 310, a weight adjusted so that a stress of 25.5 MPa acts on the wire Wa was used. Further, the intermediate portion in the longitudinal direction of the wire Wa was sandwiched between a pair of columnar members 314. The radius r of the columnar member 314 defines the bending radius r of the strand Wa during the experiment, and here, a radius r = 6 mm was used. Then, the operation of turning one end portion of the strand Wa around the portion sandwiched between the pair of columnar members 314 90 degrees to one side and 90 degrees to the other rear side was repeated. The repetition rate was 90 reciprocations per minute (180 degrees of bending was performed twice). Then, the flexibility was evaluated based on the number of times of bending (the number of reciprocations) until the wire Wa to be tested was broken.

  The above bending test was performed three times for each of the five types of strands Wa having the strand diameters Φ = 1.00 mm, 0.80 mm, 0.45 mm, 0.35 mm, and 0.20 mm. It came to show in 6. FIG. 5 shows the number of bendings and the average value of three test results for each of the strands Wa having various strand diameters. FIG. 6 shows the relationship between the wire diameter Φ (mm) and the number of bendings (times) based on the test results, and the curve C connecting the data points is indicated by a one-dot chain line for reference.

  From these experimental results, as the wire diameter Φ decreases, the number of bends leading to disconnection increases, and in particular, the number of bends begins to increase rapidly in the range where the wire diameter Φ is 0.60 mm or less. I understand that. In addition, it has been found that when the number of times of bending leading to disconnection is 70 times or more, bending resistance with no practical problem can be obtained, and the number of times of bending exceeds about 70 when the wire diameter is Φ0.60 mm or less. . The experimental results here are considered to apply similarly to each of the above-described embodiments and modifications, which are aggregates of a plurality of strands. From these, it has been found that the strand diameter Φ is preferably 0.60 mm or less.

  In addition, although it is preferable that all the strands used are in the said range, this is not essential.

  A test for evaluating damage to the insulator when bent was performed on the conductor portion and the flat conductor of the flat cable according to the first embodiment.

The test conditions are as follows. That is, as a sample 1 corresponding to the conductor portion of the flat cable according to the first embodiment, a twisted wire prepared by twisting seven strands having a diameter of 0.30 mm is prepared, and a conductor in which 16 twisted wires are arranged in parallel. Prepared the department. Further, as Sample 2 according to the comparative example, a rectangular conductor having a thickness dimension of 0.8 mm and a width dimension of 10 mm was prepared. The conductor cross-sectional area of these samples 1 and 2 is about 8 mm ² .

  In the test, samples 1 and 2 having a length of 300 mm were used. Then, the samples 1 and 2 were bent at about 90 degrees so as to be substantially L-shaped (see FIG. 8) from a state where the samples 1 and 2 were linearly stretched (see FIG. 7). As a bending condition at this time, as shown in FIG. 9, when the bending gap L defining the thickness dimension of the bent portion is the same as the cable thickness dimension of the own cable, the cable thickness dimension is twice as large. In this case, the case where the thickness of the cable is three times as large is set.

  And the external appearance of the bending part of the cable was observed and it was confirmed whether the coating | coated part which is an insulator was damaged.

  The test results are as shown in FIG. As a result of the test, in Sample 1 according to Embodiment 1, no change was observed in the covering portion (insulator), and it was found that damage to the covering portion was suppressed. Moreover, in the sample 2 which concerns on a comparative example, when it became the same as a cable thickness dimension, it was confirmed that a crack has arisen in the coating | coated part (insulator) by the case where it becomes twice the cable thickness dimension. When observing the cracked part, it can be predicted that when the cable is bent, the rectangular part of the rectangular conductor is in contact with the covering part with a strong force, causing damage to the covering part, resulting in cracking. It was. From these, when the cable which concerns on this embodiment was bent, it turned out that the damage given to a coating | coated part can be suppressed and the damage of the said coating | coated part can be suppressed.

It is sectional drawing which shows the cable which concerns on 1st Embodiment. It is sectional drawing which shows the cable which concerns on 2nd Embodiment. It is sectional drawing which shows the cable which concerns on the modification of 1st Embodiment. 6 is a diagram for explaining a bending test condition according to Example 1. FIG. It is a figure which shows the bending test result which concerns on Example 1. FIG. It is a figure which shows the bending test result which concerns on Example 1. FIG. 6 is a diagram for explaining test conditions according to Example 2. FIG. 6 is a diagram for explaining test conditions according to Example 2. FIG. 6 is a diagram for explaining test conditions according to Example 2. FIG. It is a figure which shows the test result of Example 2.

Explanation of symbols

10, 110, 210 Cable 12, 112 Conductor portion 14, 114 Wire 16 Stranded wire 20, 120, 220 Cover portion 115 Wire parallel group 222a, 222b Recessed portion

Claims (5)

A conductor portion that is assembled on a non-coplanar surface in a state where a plurality of strands are in contact with each other, and formed as a flat wire as a whole,
A covering portion covering the outer periphery of the conductor portion;
With cable. The cable of claim 1,
The said conductor part is a cable which is arrange | positioned in parallel on substantially the same plane so that the multiple twisted wires which twisted several said strands may mutually contact. The cable of claim 1,
The conductor portion is a cable in which a plurality of the strands arranged in parallel on substantially the same plane are provided in a plurality of layers so as to further contact each other. The cable according to any one of claims 1 to 3, wherein
The cable which formed the surface of the said coating | coated part in uneven | corrugated shape. The cable according to any one of claims 1 to 4,
The cable has a diameter of 0.05 mm to 0.60 mm.

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