JP2012195170A - Cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable capable of being reduced in diameter while maintaining strength and conductivity thereof.SOLUTION: A cable 1 includes: a tensile strength wire 2; and a plurality of conductors 3 covered with an insulator 5 and wound around the outer periphery of the tensile strength wire 2. In each of the conductors 3, a length along the circumferential direction of the tensile strength wire 2 is longer than a length along the radial direction of the tensile strength wire 2, in a cross-sectional shape perpendicular to the axis of the tensile strength wire 2.

Description

  The present invention relates to a cable excellent in tensile strength.

  2. Description of the Related Art Conventionally, an electric cable that uses a fiber excellent in tensile strength as a core material and has increased tensile strength has been known (see, for example, Patent Document 1). As a configuration of the cable, there is known a structure in which a tensile body such as an aramid fiber is arranged at the center as a core, a conductor covered with insulation is wound around the outer periphery, and these are covered with a sheath.

  In particular, in the case of a small-diameter cable (for example, the outermost cable diameter is 0.55 mm to 1.00 mm) with a limited cross-sectional area, this configuration may be adopted from the viewpoint of securing strength and flexibility. Many. A configuration of a conventional cable will be described with reference to FIGS. FIG. 3 is a schematic cross-sectional view of a cable according to a conventional example. FIG. 4 is a schematic diagram illustrating the configuration of a cable according to a conventional example.

  As shown in FIG. 3, the cable 101 has a tensile strength wire 102 made of a fiber having excellent tensile strength as a core, and a plurality of conductors 103 covered with an insulator 105 are wound around the outer peripheral surface in a spiral shape. The outside is covered with a sheath 104. As the conductor 103, a so-called round conductor having a circular cross section, which is a single conductor formed by twisting a plurality of conductive wires, is used. By arranging a plurality of such conductors 103 in parallel and winding them around the outer periphery of the tensile strength wire 102, it is possible to achieve excellent tensile strength and flexibility (flexibility) in a small-diameter cable.

  However, when further reducing the diameter of the cable having such a cross-sectional configuration, there are the following problems. That is, in order to reduce the diameter of the cable, it is necessary to make the tensile wire 102 and the conductor 103 thinner, but from the viewpoint of ensuring the strength of the cable, there is a limit to making the tensile wire 102 thinner. On the other hand, if the conductor 103 is made thin, the electrical resistance increases due to the reduction of the conductor cross-sectional area, and there is a limit to making it thin.

JP-A-9-270207

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a cable that can be reduced in diameter while ensuring the strength and transmission performance of the cable. is there.

In order to achieve the above object, the cable according to the present invention is:
Tensile strength line,
A plurality of conductors covered with an insulator and wound around the outer periphery of the tensile strength wire;
A cable comprising:
The conductor is characterized in that, in a cross-sectional shape perpendicular to the axis of the tensile strength line, a length along the circumferential direction of the tensile strength line is longer than a length along a radial direction of the tensile strength line.

According to the present invention, by making the cross-sectional shape of the conductor long in the circumferential direction, the cross-sectional area of the conductor can be increased without expanding the cross-section in the radial direction. That is, the cross-sectional area of the conductor can be increased without reducing the diameter of the tensile strength wire. Therefore, in reducing the diameter of the cable, an increase in electrical resistance can be suppressed while maintaining the strength of the cable.

  In the cross-sectional shape, the total length of the plurality of conductors along the circumferential direction of the tensile strength line may be substantially equal to the circumferential length of the tensile strength line.

  In other words, it is preferable to form the conductor region over substantially the entire circumference of the tensile strength wire by winding the conductors side by side without any gap. Thereby, it is possible to secure a wider conductor cross-sectional area.

  In the cross-sectional shape, the lengths of the plurality of conductors along the circumferential direction of the tensile strength lines may be different from each other.

  That is, the size of the cross-sectional area of each conductor can be determined arbitrarily. Therefore, various conductors having different cross-sectional sizes can be used.

  A metal tape may be wound around the outer periphery of the conductor.

  By winding the metal tape, the influence on the conductor from the outside can be reduced.

  The conductor may have a substantially rectangular cross-sectional shape, and may be wound so that the long side of the cross-section is along the outer periphery of the tensile strength line.

  Thus, by winding a conductor having a substantially rectangular cross-sectional shape so that the long side of the cross-section is along the outer periphery of the tensile strength line, in the cross-section perpendicular to the axis of the tensile strength line, along the circumferential direction of the tensile strength line. The cross-sectional shape of the conductor can be formed in which the length is longer than the length along the radial direction of the tensile strength line.

In order to achieve the above object, the cable in the present invention is
Tensile strength line,
A plurality of conductors covered with an insulator and wound around the outer periphery of the tensile strength wire;
A cable comprising:
The conductor has a cross-sectional shape along the axial direction of the tensile strength line, wherein a length along the axial direction of the tensile strength line is longer than a length along the radial direction of the tensile strength line.

  According to the present invention, the number of times the conductor is wound around the tensile wire can be reduced by making the cross-sectional shape of the conductor wound around the tensile wire long in the axial direction. Thereby, the length of the conductor can be shortened without impairing the flexibility of the cable, and the electrical resistance can be reduced.

  According to the present invention, it is possible to reduce the diameter while ensuring the strength and transmission performance of the cable.

The typical sectional view of the cable concerning the example of the present invention. The schematic diagram explaining the structure of the cable which concerns on the Example of this invention. The typical sectional view of the cable concerning a conventional example. The schematic diagram explaining the structure of the cable which concerns on a prior art example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

(Example)
With reference to FIG.1 and FIG.2, the cable which concerns on the Example of this invention is demonstrated. FIG. 1 is a schematic cross-sectional view of a cable according to the present embodiment. FIG. 2 is a schematic diagram illustrating the configuration of the cable according to the present embodiment.

<Schematic configuration of cable>
As shown in FIGS. 1 and 2, the cable 1 according to the present embodiment includes a tensile wire 2, a plurality of conductors 3 that are spirally wound around the outer peripheral surface of the tensile wire 2, and the conductor 3 is wound around. A resin sheath 4 covering the outside of the rotated tensile strength wire 2.

  The tensile strength wire 2 is a wire having a substantially circular cross section made of a material having excellent tensile strength such as an aramid fiber.

  The conductor 3 is a strip-shaped member having a conductive shape having a substantially rectangular cross section. As the conductor 3, for example, a so-called flat conductor formed by rolling a copper wire into a strip shape can be used. The conductor 3 is covered with an insulator 5 made of an insulating material such as a fluororesin. The number of conductors 3 is appropriately changed according to the use of the cable.

  In the cable 1 of the present embodiment, a fluororesin is used as the insulator 5 that covers the conductor 3. The fluororesin is excellent in wear resistance and easy to be thinly molded, and is suitable for small diameter cable applications. In addition, for example, in use as a headphone cable, a metal tape may be wound around the outer periphery around which the conductor 3 is wound in order to prevent noise.

<Excellent points of this embodiment>
The conductor 3 is wound so that the long side of the substantially rectangular cross-sectional shape is along the outer periphery of the tensile strength wire 2 as shown in FIG. 2, and the cross-sectional shape perpendicular to the axis of the tensile strength wire 2 is shown in FIG. The length of the tensile strength line 2 along the circumferential direction is longer than the length of the tensile strength line 2 along the radial direction.

  When this embodiment of FIG. 1 is compared with the conventional example of FIG. 3, when a plurality of conductors are wound around the outer periphery of the tensile wire without any gaps under the same condition of the outermost diameter of the cable and the diameter of the tensile wire, FIG. The round conductor 103 shown is more wound than the conductor 3 shown in FIG. 1, and the proportion of the area occupied by the insulator is larger in the configuration of FIG. 3 than in the configuration of FIG. Become. In addition, as shown in FIG. 1, in this embodiment, the total length of the conductors 3 along the circumferential direction of the tensile strength line 2 is substantially equal to the circumferential length of the tensile strength line 2, and is substantially equal to the outer circumference of the tensile strength line 2. The region of the conductor 3 is formed over the entire circumference.

  Therefore, according to the present embodiment, the ratio of the conductor portion (portion through which electricity passes) in the cable cross section can be made larger than that in the conventional example of FIG. 3, and a wider conductor cross-sectional area can be secured. It becomes. Thereby, the increase in the electrical resistance of a conductor can be suppressed and the transmission performance of a thin cable can be improved.

As shown in FIG. 2, the conductor 3 wound around the outer peripheral surface of the tensile strength wire 2 has a cross-sectional shape along the axial direction of the tensile strength wire 2, and the length along the axial direction of the tensile strength wire 2 is The length is longer than the length along the radial direction.

  According to such a configuration, as shown in FIG. 2, when a plurality of conductors are closely parallel to each other in the axial direction and wound around the outer periphery of the tensile strength wire, it is long in the axial direction like the conductor 3 of this embodiment. With the cross-sectional shape, the number of times of winding the conventional round conductor 103 shown in FIG. 4 around the tensile strength wire 2 can be reduced as compared with the case where a plurality of the conventional round conductors 103 are wound in parallel at the same pitch. Note that by increasing the winding pitch, the number of times the conductor 103 is wound can be reduced even in the conventional example, but if the pitch is increased, the flexibility of the cable may be reduced.

  Therefore, according to the present embodiment, the length of the conductor (the total length of the conductor before being wound around the tensile strength wire) can be shortened without impairing the flexibility of the cable. By shortening the length of the conductor, an increase in electrical resistance of the conductor can be suppressed.

  In addition, the contact area between the conductor and the tensile wire or sheath increases. Therefore, for example, in wiring work, it is possible to suppress the danger of the tensile strength line popping out when the sheath is peeled off at the cable end.

  According to this embodiment, the conductor 3 has a cross-sectional shape in which the length along the circumferential direction of the tensile wire 2 is longer than the length along the radial direction of the tensile wire 2, thereby increasing the radial dimension. The cross-sectional area can be increased without doing so. That is, the cross-sectional area of the conductor 3 can be increased without reducing the diameter of the tensile strength wire 2. Therefore, in reducing the diameter of the cable, it is possible to ensure a high level of tensile strength, transmission performance, flexibility, and the like.

  As described above, according to the present embodiment, the diameter can be reduced while ensuring the strength and transmission performance of the cable.

<Others>
The sizes of the cross-sectional areas of the plurality of conductors 3 do not have to be the same, and can be arbitrarily set individually. That is, in the cross-sectional shape of the cable, the lengths along the circumferential direction of the tensile strength wires 2 of the plurality of conductors 3 may be different from each other. Therefore, various conductors having different cross-sectional sizes can be used as the conductor 3.

  The cable of the present embodiment can be used as various cables such as a power transmission cable and a communication cable, and is not limited to a cable for a specific application. Moreover, the cable of a present Example is not limited to a thin cable of 1 mm or less, It can apply suitably also to the cable structure of various diameters.

  Further, for example, when it is difficult to wind a plurality of conductor wires closely in parallel due to the small number of cores, a dummy strip member may be wound as a spacer between the conductors.

1 Cable 2 Tensile wire 3 Conductor 4 Sheath 5 Insulator

Claims (6)

Tensile strength line,
A plurality of conductors covered with an insulator and wound around the outer periphery of the tensile strength wire;
A cable comprising:
The cable is characterized in that, in a cross-sectional shape perpendicular to the axis of the tensile strength wire, the length along the circumferential direction of the tensile strength wire is longer than the length along the radial direction of the tensile strength wire.   2. The cable according to claim 1, wherein, in the cross-sectional shape, a total length of a plurality of the conductors along a circumferential direction of the tensile strength line is substantially equal to a circumferential length of the tensile strength line.   The cable according to claim 1 or 2, wherein in the cross-sectional shape, lengths of the plurality of conductors along the circumferential direction of the tensile strength lines are different from each other.   The cable according to any one of claims 1 to 3, wherein a metal tape is wound around an outer periphery around which the conductor is wound.   The cable according to any one of claims 1 to 4, wherein the conductor has a substantially rectangular cross-sectional shape, and is wound so that a long side of the cross-section is along an outer periphery of the tensile strength line. . Tensile strength line,
A plurality of conductors covered with an insulator and wound around the outer periphery of the tensile strength wire;
A cable comprising:
The cable is characterized in that, in a cross-sectional shape along the axial direction of the tensile strength wire, a length along the axial direction of the tensile strength wire is longer than a length along the radial direction of the tensile strength wire.

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