JP2011014447A - Flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat cable capable of suppressing opening easy to occur when a force is applied from a lateral direction and jumping-out of a part of a twisted wire easy to occur when a force is added in the lateral direction by enlarging a contact area of a conductor and an insulator if the conductor is composed by collecting a plurality of twisted wires in parallel on the same plane face.SOLUTION: By using at least one of the plurality of twisted wires 16 collected in parallel on the same plane face as a thin twisted wire 16b smaller in cross-sectional area than the other twisted wires 16a, unevenness of a surface of the conductor 12 is enlarged than before, and bite of the insulator 14 into a recessed part of the conductor 12 is increased.

Description

  The present invention relates to a flat cable, and more particularly to a flat cable suitably used for a vehicle such as an automobile.

  Conventionally, flat cables have been widely used due to demands such as space saving of wiring. The flat cable is composed of, for example, a conductor and an insulator covering the outer periphery of the conductor, and has a flat appearance as a whole.

  A flat conductor is often used as the conductor of the flat cable, but the following configuration is also known. That is, as shown in FIG. 4, a conductor 32 is known in which a large number of stranded wires 36 formed by twisting a plurality of strands are arranged in a horizontal row (Patent Document 1). The outer periphery of the conductor 32 is covered with an insulator 34 such as rubber or plastic.

Japanese Utility Model Publication No. 02-15253

  As shown in FIG. 4, when the conductor 32 is composed of a plurality of twisted wires 36 arranged in a horizontal row, adjacent twisted wires 36 are in contact with each other, but are not joined. Each stranded wire 36 can move independently. Further, the adhesion between the stranded wire 36 and the insulator 34 is not so high.

  Therefore, for example, when a force from the width direction (lateral direction) is applied to the flat cable 30, the insulator 34 in close contact with the stranded wire 36 is displaced from the stranded wire 36 as shown in FIG. There is a possibility that the strands 36 of the book will break the arrangement and be scattered inside, and the insulator 34 may be in an open state. As a result, an air layer is formed between the stranded wire 36 and the insulator 34, so that heat dissipation from the surface of the stranded wire 36 may be deteriorated.

  Further, for example, when the flat cable 30 is bent in the width direction (lateral direction) for the convenience of wiring, as shown in FIG. There is a risk that a part of the stranded wire 36 jumps out or is pulled in. As a result, the terminal connected to the terminal is also displaced, so that the contact area at the contact of the terminal may vary.

  The problem to be solved by the present invention is that when the conductor is formed by collecting a plurality of stranded wires in parallel on the same plane, it is possible to prevent the insulator that is in close contact with the stranded wire from deviating from the stranded wire. To provide a flat cable.

  The flat cable according to the present invention includes a conductor configured by collecting a plurality of stranded wires in parallel on the same plane, and an insulator that covers an outer periphery of the conductor, and among the plurality of stranded wires. At least one of the above is composed of a fine stranded wire having a smaller cross-sectional area than the other stranded wires.

  The fine stranded wire having a small cross-sectional area may have a smaller wire diameter constituting the stranded wire or a smaller number of strands constituting the stranded wire than other stranded wires. May be. The fine stranded wires having a small cross-sectional area and the other stranded wires may be alternately arranged on the same plane. It is preferable that the cross-sectional area ratio of the other stranded wire to the fine stranded wire having a small cross-sectional area is 1.25 or more.

  The flat cable of another configuration according to the present invention has a conductor configured by collecting a plurality of stranded wires in parallel on the same plane, and an insulator covering an outer periphery of the conductor, and the stranded wire The gist of the invention is that at least one of the plurality of strands located on the surface of the wire is made of a thick strand thicker than the other strands.

  At this time, the cross-sectional area ratio of the thick strands with respect to the other strands is preferably 1.40 or more.

  According to the flat cable according to the present invention, since at least one of the plurality of stranded wires constituting the conductor is formed of a fine stranded wire having a smaller cross-sectional area than the other stranded wires, the portion of the fine stranded wire is Since it becomes a trough part of a conductor and an insulator bites into this trough part, the insulator is caught on the conductor. Therefore, for example, when a force from the width direction (lateral direction) is applied to the flat cable, or when the flat cable is bent in the width direction (lateral direction), the insulator is not easily displaced from the stranded wire. Thereby, it is possible to suppress the opening of the insulator, part of the stranded wire, and the like.

  A fine stranded wire with a small cross-sectional area has a smaller strand diameter constituting the stranded wire than other stranded wires, or a smaller number of strands constituting the stranded wire than other stranded wires, or these It can be easily obtained by combination.

  In the flat cable according to the present invention, when the thin stranded wires having a small cross-sectional area and the other stranded wires are alternately arranged on the same plane, the insulation can be more bitten. Hard to deviate from the line. Moreover, since the amount of biting of the insulator can be increased when the cross-sectional area ratio of the other stranded wire to the fine stranded wire having a small cross-sectional area is 1.25 or more, the insulator is more unlikely to be displaced from the stranded wire.

  According to another flat cable according to the present invention, at least one of the plurality of strands located on the surface of the stranded wire constituting the conductor is made of a thick strand thicker than the other strands, The thick wire portion becomes a crest portion of the conductor, and this crest portion bites into the insulator, so that the insulator is caught on the conductor. Therefore, for example, when a force from the width direction (lateral direction) is applied to the flat cable, or when the flat cable is bent in the width direction (lateral direction), the insulator is not easily displaced from the stranded wire. Thereby, it is possible to suppress the opening of the insulator, part of the stranded wire, and the like.

  At this time, if the cross-sectional area ratio of the thick wire to the other wires is 1.40 or more, the amount of biting of the insulator can be increased.

It is a cross-sectional view showing the flat cable which concerns on 1st embodiment of this invention. It is a cross-sectional view showing the flat cable which concerns on 2nd embodiment of this invention. It is a cross-sectional view showing the flat cable which concerns on 3rd embodiment of this invention. It is a cross-sectional view showing a conventional flat cable. It is a cross-sectional view explaining the state where the force of the width direction (lateral direction) was applied to the flat cable. It is a cross-sectional view explaining the state where the flat cable was bent in the width direction (lateral direction).

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the flat cable 10 according to the first embodiment of the present invention covers a conductor 12 constituted by a plurality of stranded wires 16 gathered in parallel on the same plane, and an outer periphery of the conductor 12. It comprises what has the insulator 14 which does.

  The plurality of stranded wires 16 constituting the conductor 12 include those having different cross-sectional areas. That is, the multiple stranded wires 16 include a thick stranded wire 16a having a relatively large cross-sectional area and a fine stranded wire 16b having a smaller cross-sectional area than the thick stranded wire 16a.

  The thick stranded wire 16a and the fine stranded wire 16b are each formed by twisting a plurality of strands 18 together. The thick stranded wire 16a and the fine stranded wire 16b have the same number of strands 18, but the strands 18c and 18d constituting the fine stranded wire 16b have strand diameters constituting the thick stranded wire 16a. It is smaller than the strand diameter of the wires 18a and 18b. The thick stranded wire 16a is arranged such that six outer strands 18b surround the central strand 18a around the central strand 18a, and a total of seven strands 18 are formed. The fine stranded wire 16b is arranged such that six outer strands 18d surround the central strand 18c around the central strand 18c, and a total of seven strands 18 are formed.

  The thick stranded wire 16a and the fine stranded wire 16b are alternately arranged on the same plane, the thick stranded wire 16a is a peak of the conductor 12, and the fine stranded wire 16b is a valley of the conductor 12. It has become. Thereby, the surface area of the whole conductor is larger compared with the conventional conductor comprised with the several strand wire with equal cross-sectional area. Moreover, the unevenness | corrugation of the conductor surface is larger. Therefore, the insulator 14 covering the outer periphery of the conductor 12 can bite into the valley portion of the conductor 12 formed by the portion of the thin stranded wire 16b. In other words, the peak portion of the conductor 12 made of the thick stranded wire 16 a can bite into the insulator 14 covering the outer periphery of the conductor 12. Thereby, the insulator 14 is easily caught on the conductor 12. Therefore, for example, when the force from the width direction (lateral direction) is applied to the flat cable 10 or when the flat cable 10 is bent in the width direction (lateral direction), the insulator 14 is not easily displaced from the conductor 12. ing. In particular, since the thick stranded wires 16a and the fine stranded wires 16b are alternately arranged on the same plane, the intrusion of the insulator 14 into the conductor 12 or the intrusion of the conductor 12 into the insulator 14 is very large. it can.

  From the standpoint that the penetration of the insulator 14 into the conductor 12 can be increased, the ratio of the cross-sectional area of the thick stranded wire 16a and the fine stranded wire 16b (thick stranded wire / fine stranded wire) is 1.25 or more. preferable. More preferably, it is 2.6 or more, More preferably, it is 5.7 or more.

  Deviation between the insulator 14 and the conductor 12 is more likely to occur as the electric wire is a flat cable and the number of the stranded wires 16 constituting the conductor 12 increases and becomes wider. Therefore, the number of stranded wires 16 constituting the conductor 12 is preferably 5 or more from the viewpoint of excellent effect of preventing the displacement between the insulator 14 and the conductor 12. More preferably, it is 7 or more.

  The plurality of stranded wires 16 are collected in parallel on the same plane. Collected means that they are arranged in parallel on the same plane without any gap. Adjacent stranded wires 16 have portions in contact with each other. The part where the adjacent twisted wires 16 contact each other may extend over the entire length in the longitudinal direction, or may be a part. Since the whole should just function as one conductor, the adjacent twisted wires 16 may have a portion that is not in contact in the longitudinal direction.

  The material of the insulator 14 is not particularly limited, and examples thereof include polyolefin resins such as polyethylene and polypropylene, and vinyl chloride resins. The polyolefin may be cross-linked.

  In the flat cable 10 according to the first embodiment, a plurality of fine stranded wires 16b are included, but one or more fine stranded wires 16b may be provided. Further, one thin stranded wire 16b is arranged between the thick stranded wire 16a and the thick stranded wire 16a, and the thick stranded wire 16a and the fine stranded wire 16b are alternately arranged. Two or more fine stranded wires 16b may be arranged between the thick stranded wire 16a, or two or more thick stranded wires 16a may be arranged between the fine stranded wire 16b and the fine stranded wire 16b. good. Moreover, the thick stranded wire 16a and the fine stranded wire 16b may be arrange | positioned at random.

  In the flat cable 10 according to the first embodiment, two types of stranded wires, a thick stranded wire 16a and a fine stranded wire 16b, are included, but the cross-sectional area is smaller than the thick stranded wire 16a but larger than the fine stranded wire 16b. One or two or more medium stranded wires may be further included. In this case, a plurality of types of medium stranded wires having different cross-sectional areas may be included.

  In the flat cable 10 according to the first embodiment, the number of the strands 18 constituting the thick stranded wire 16a and the fine stranded wire 16b is seven, but each may be other numbers. Further, the number of the strands 18 of the thick stranded wire 16a and the thin stranded wire 16b is the same, but the number of the strands 18 of the thick stranded wire 16a is different from the number of the strands 18 of the fine stranded wire 16b. May be.

  Next, the flat cable which concerns on 2nd embodiment of this invention is demonstrated. As shown in FIG. 2, the flat cable 110 according to the second embodiment includes a conductor 112 configured by collecting a plurality of stranded wires 116 in parallel on the same plane, and an insulator covering the outer periphery of the conductor 112. 14.

  The plurality of stranded wires 116 constituting the conductor 112 include those having different cross-sectional areas. That is, the multiple stranded wires 116 include a thick stranded wire 116a having a relatively large cross-sectional area and a thin stranded wire 116b having a smaller cross-sectional area than the thick stranded wire 116a.

  The thick stranded wire 116a and the fine stranded wire 116b are each formed by twisting a plurality of strands 118. The thick stranded wire 116a and the fine stranded wire 116b have the same thickness, but the number of the strands 118 constituting the fine stranded wire 116b is the same as that of the strand 118 constituting the thick stranded wire 116a. It is less than the number. The thick stranded wire 116a is arranged such that the six strands 118 surround the central strand 118a around the central strand 118a, and the 12 strands 118 are disposed outside the six strands 118a. Eighteen strands 118 are arranged outside the 12 strands 118, and a total of 37 strands 118 are formed. Three layers of the strands 118 are formed around the central strand 118a. On the other hand, the thin stranded wire 116b is arranged so that six outer strands 118d surround the central strand 118c around the central strand 118c, and is composed of a total of seven strands 118. .

  The thick stranded wires 116a and the thin stranded wires 116b are alternately arranged on the same plane, and the portions of the thick stranded wires 116a become the peak portions of the conductor 112, and the portions of the fine stranded wires 116b and the valley portions of the conductor 112. It has become. The conductor 112 has a larger surface area of the entire conductor as compared to a conventional conductor composed of a plurality of stranded wires having the same cross-sectional area. Moreover, the unevenness | corrugation of the surface of a conductor is larger. Therefore, the insulator 14 covering the outer periphery of the conductor 112 can bite into the valley portion of the conductor 112 formed by the portion of the thin stranded wire 116b. Thereby, the insulator 14 is easily caught on the conductor 112. In particular, since the thick stranded wires 116a and the thin stranded wires 116b are alternately arranged on the same plane, the intrusion of the insulator 14 into the conductor 112 or the intrusion of the conductor 112 into the insulator 14 is very large. it can.

  From the standpoint that the penetration of the insulator 14 into the conductor 112 can be increased, the ratio of the cross-sectional area of the thick stranded wire 116a and the fine stranded wire 116b (thick stranded wire / fine stranded wire) is 1.25 or more. preferable. More preferably, it is 2.6 or more, More preferably, it is 5.7 or more.

  In the flat cable 110 according to the second embodiment, like the flat cable 10 according to the first embodiment, the number of stranded wires 116 constituting the conductor 112 is preferably 5 or more. More preferably, it is 7 or more. Adjacent stranded wires 116 need only have portions that are in contact with each other, and portions that are not in contact in the longitudinal direction may be formed. As a material of the insulator 14, the material shown by the flat cable 10 which concerns on 1st embodiment can be illustrated.

  In the flat cable 110 according to the second embodiment, one or more fine stranded wires 116b may be provided as in the flat cable 10 according to the first embodiment. Two or more fine stranded wires 116b may be disposed between the thick stranded wire 116a and the thick stranded wire 116a, or two or more thick stranded wires 116a may be disposed between the fine stranded wire 116b and the fine stranded wire 116b. It may be arranged. Moreover, the thick stranded wire 116a and the fine stranded wire 116b may be arrange | positioned at random. Furthermore, one or two or more medium stranded wires smaller than the thick stranded wire 116a but larger in cross-sectional area than the fine stranded wire 116b may be included. In this case, a plurality of types of medium stranded wires having different cross-sectional areas may be included.

  In the flat cable 110 according to the second embodiment, the number of the strands 118 constituting the thick stranded wire 116a and the fine stranded wire 116b is not particularly limited. Further, the thickness of the thick stranded wire 116a may be different from the thickness of the strand 118 constituting the fine stranded wire 116b.

  Next, the flat cable which concerns on 3rd embodiment of this invention is demonstrated. As shown in FIG. 3, the flat cable 210 according to the third embodiment includes a conductor 212 configured by a plurality of stranded wires 216 gathered in parallel on the same plane, and an insulator covering the outer periphery of the conductor 212. 14.

  Each stranded wire 216 includes a central strand 218a and six outer strands 218 disposed around the central strand 218a so as to surround the central strand 218a. The six outer strands 218 are spirally wound around the central strand 218a and are located on the surface of the stranded wire 216. Therefore, it has a part which contacts the insulator 14 in the longitudinal direction. At this time, one of the six outer strands 218 is a thick strand 218c that is thicker than the other outer strand 218b. The other outer strands 218b have the same thickness. The portion of the thick wire 218 c becomes a peak portion of the stranded wire 216 and the conductor 212, and this peak portion can bite into the insulator 14. For this reason, the insulator 14 is often caught on the stranded wire 216 and the conductor 212. As a result, the insulator 14 is not easily displaced from the conductor 212.

  At this time, from the standpoint that the amount of biting of the insulator 14 can be increased, the cross-sectional area ratio (thick wire / other outer wire) of the thick wire 218c with respect to the other outer wire 218b is 1.40 or more. It is preferable. More preferably, it is 4.0 or more, More preferably, it is 7.9 or more.

  The number of thick strands 218c per stranded wire 216 is not particularly limited, but when the number of thick strands 218c is 3, the number of thick strands 218c and other outer strands 218b is Since the number is the same, the thick strands 218c and the other outer strands 218b can be alternately arranged. Thereby, since the unevenness | corrugation of the surface of the strand wire 216 becomes large, the amount of biting of the insulator 14 can be increased. That is, the number of thick strands 218c per twisted wire 216 is preferably one or more and less than half of the outer strands 218 located on the surface of the twisted wire 216.

  In the flat cable 210 according to the third embodiment, between the stranded wires 216, the number of thick wires 218c, the thickness of the thick wires 218c, and the cross-sectional area ratio of the thick wires 218c with respect to the other outer wires 218b The arrangement configuration of the thick strand 218c and the other outer strand 218b, the number of strands 218 constituting the stranded wire 216, and the like may be the same or different. Further, these may be different from each other among all the plurality of stranded wires 216, or may be different between some of the plurality of stranded wires 216. Further, the number of the strands 218 constituting the stranded wire 216 is not particularly limited.

  In the flat cable 210 according to the third embodiment, like the flat cable 10 according to the first embodiment, the number of stranded wires 216 constituting the conductor 212 is preferably 5 or more. More preferably, it is 7 or more. Adjacent stranded wires 216 need only have portions that are in contact with each other, and portions that are not in contact in the longitudinal direction may be formed. As a material of the insulator 14, the material shown by the flat cable 10 which concerns on 1st embodiment can be illustrated.

  In the flat cable 210 according to the third embodiment, some or all of the other outer strands 218b may have different thicknesses.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, a conductor including a plurality of twisted wires gathered in parallel on the same plane and an insulator covering the outer periphery of the conductor, and at least one of the plurality of twisted wires is another twisted wire. In the case of a thin stranded wire having a smaller cross-sectional area than the wire, the number of strands constituting the thin stranded wire having a smaller cross-sectional area is less than the number of strands constituting the other stranded wire (thick stranded wire), And the thickness of the strand which comprises a thin twisted wire with a small cross-sectional area may be thinner than the thickness of the strand which comprises another twisted wire (thick twisted wire).

10, 110, 210 Flat cable 12, 112, 212 Conductor 14 Insulator 16, 116, 216 Twisted wire 16a, 116a Thick stranded wire 16b, 116b Fine stranded wire 18, 118, 218 Wire 20 Insulator

Claims (7)

A conductor composed of a plurality of twisted wires gathered in parallel on the same plane, and an insulator covering the outer periphery of the conductor;
A flat cable, wherein at least one of the plurality of stranded wires is formed of a fine stranded wire having a smaller cross-sectional area than other stranded wires.   2. The flat cable according to claim 1, wherein a strand diameter of the thin stranded wire having a small cross-sectional area is smaller than a strand diameter of the other stranded wire.   The flat cable according to claim 1 or 2, wherein the number of strands constituting the thin stranded wire having a small cross-sectional area is smaller than the number of strands constituting the other stranded wire.   The flat cable according to any one of claims 1 to 3, wherein the thin stranded wires having a small cross-sectional area and the other stranded wires are alternately arranged on the same plane.   The flat cable according to any one of claims 1 to 4, wherein a ratio of a cross-sectional area of the other stranded wire to a thin stranded wire having a small cross-sectional area is 1.25 or more. A conductor composed of a plurality of twisted wires gathered in parallel on the same plane, and an insulator covering the outer periphery of the conductor;
A flat cable, wherein at least one of a plurality of strands positioned on the surface of the stranded wire is a thick strand thicker than other strands.   The flat cable according to claim 6, wherein a cross-sectional area ratio of the thick wire to the other wire is 1.40 or more.

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