JP2010129405A - Insulated wire and wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulated wire for restraining snapping of a strand in spite of repetitive bending, and a wire harness using the insulated wire. <P>SOLUTION: The insulated wire includes a collective strand which collectively twists a plurality of strands, a conductor made of an assembled strand wherein a plurality of sub-group strand twisted by a plurality of strands are twisted in a direction equal to the twisting direction of the hole sub-group strands, and an insulator. Then, the insulated wire is used in a wire bundle of the wire harness. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an insulated wire and a wire harness.

  Conventionally, an insulated wire in which an insulator is provided on the outer periphery of a conductor has been widely used for wiring such as vehicles such as automobiles and electric / electronic devices. The conductor may be a stranded wire in which a plurality of metal strands are twisted together. For example, when an insulated wire having such a stranded wire is used as a power line, the number of strands may increase depending on the amount of current. When the number of strands is large in this way, conventionally, a collective stranded wire obtained by further gathering and twisting strands in which a predetermined number of strands are twisted in advance is sometimes used as a conductor. At this time, in order to easily adjust the shape of the conductor, it is common to reverse the twist direction of the strand strands and the twist direction of the collective strands.

  For example, Patent Document 1 discloses a conductor for an insulated wire obtained by twisting a plurality of strands obtained by twisting a plurality of strands in a direction opposite to the stranding direction of the strands.

JP-A-8-249926

  By the way, for example, an insulated wire may be wired in a place where bending is repeatedly applied, such as between a vehicle body and a door. However, in the insulated wire of Patent Document 1, when the insulated wire is repeatedly bent, stress interference occurs between the strands, and metal fatigue occurs in the strands, which makes it easy to break.

  Then, the subject which this invention tends to solve is providing the insulated wire which can suppress the disconnection of a strand even if bending is added repeatedly. Moreover, the other subject is to provide the wire harness using this insulated wire.

  In order to solve the above problems, an insulated wire according to the present invention is an insulated wire having a conductor and an insulator coated on the outer periphery of the conductor, and the conductor twists a plurality of strands at once. It consists of a collective stranded wire or a collective stranded wire twisted in the same direction as the stranded direction of all the strands of strands, or a plurality of strands of strands in which a plurality of strands are twisted together is there.

  On the other hand, the wire harness which concerns on this invention has the said insulated wire.

  According to the insulated wire according to the present invention, a plurality of strands in which a plurality of strands are twisted together, or a plurality of strands in which a plurality of strands are twisted together, a twist of all strands It has a conductor made of an aggregate stranded wire twisted in the same direction as the direction. For this reason, when bending is applied, the movements of the strands and the strands of the strands are less likely to restrain each other's movement, so stress interference between the strands and the strands of strands is suppressed, reducing metal fatigue. can do. Therefore, disconnection of the strand can be suppressed, and the bending resistance is excellent.

  On the other hand, since the wire harness which concerns on this invention contains the said insulated wire in the wire bundle, it can improve bending resistance.

  Next, an embodiment of the present invention will be described in detail.

  The insulated electric wire which concerns on this invention has a conductor and the insulator coat | covered on the outer periphery of this conductor. The conductor is formed by twisting together a plurality of strands in the same direction.

  FIG. 1 is a diagram showing an embodiment of the present invention, and is a schematic cross-sectional view when an insulated wire is cut perpendicularly to the longitudinal direction. The insulated wire 10 has a conductor composed of a collective strand 16 formed by further twisting a plurality of strands 14 obtained by twisting a plurality of strands 12 in a right-hand twist (in the direction of the arrow in the figure). . In addition, the collective stranded wire 16 is twisted in a right-hand twist in the same direction as the twist direction of all the child stranded wires 14. And the insulator 18 is coat | covered on the outer periphery of this conductor.

  Thus, when the insulated wire 10 is bent by aligning the twisting directions of all the twisted strands, and further aligning the twisting direction of the twisted strands and the twisting direction of the collective strands, Since it is less likely that the stranded wires 14 restrain each other's movement, metal fatigue can be suppressed.

  FIG. 2 is a diagram showing another embodiment of the present invention. A plurality of strands 14 formed by twisting a plurality of strands 12 in a right-hand twist form a plurality of right-hand strands to form a collective strand 16, and further, a conductor formed by right-twisting a plurality of the collective strands 16 is provided. is doing. In this way, by twisting a plurality of aggregate strands in the same twist direction as the strand strands and the aggregate strands, the bending resistance can be improved even in an insulated wire having a large number of strands and a large diameter. .

  Furthermore, the conductor may be composed of a batch stranded wire (not shown) in which a plurality of strands are twisted together. If a batch stranded wire is used for the conductor, the conductor can be easily manufactured and is excellent in bending resistance.

  The shape of the conductor can be appropriately determined according to the required conductor diameter.

  Examples of the material of the strand used for the conductor include, but are not limited to, annealed copper, tinned annealed copper, copper alloy, aluminum, and aluminum alloy. In addition, the conductor is preferably twisted from one type of strand having the same rigidity from the viewpoint of suppressing stress interference between the strands.

  Further, the strand diameter, the number of strands, and the twist pitch are not particularly limited, and can be appropriately changed according to the required size of the cross-sectional area of the conductor.

  Examples of the insulator material provided on the outer periphery of the conductor include a vinyl chloride resin such as polyvinyl chloride, an olefin resin such as polyethylene, polypropylene, and a propylene-ethylene copolymer, an ethylene-propylene rubber, and a butadiene rubber. Examples of the composition include a non-halogen flame retardant such as a metal hydrate (magnesium hydroxide) and various additives added to the resin, but the present invention is not particularly limited thereto.

  Further, the thickness of the insulator is not particularly limited, and can be appropriately determined in consideration of the size of the cross-sectional area of the conductor.

  Next, an example of a method for manufacturing an insulated wire will be described.

  First, a collective stranded wire or a collective stranded wire used as a conductor is prepared. In the case of a batch stranded wire, for example, a predetermined number of bobbins on which the strands are wound are prepared and set in a delivery mechanism. Then, by rotating and moving each bobbin, the strands can be twisted while being fed out from the bobbin, thereby forming a batch stranded wire. A thick collective strand may be formed by twisting a necessary number of strands in the same direction on the outer layer of the formed collective strand.

  In the case of a set stranded wire, for example, first, a predetermined number of bobbins on which the strands are wound are prepared and set in a delivery mechanism, and by rotating and moving each bobbin, the strands are twisted while being fed out of the bobbin, A strand wire is formed and wound on a bobbin. Then, prepare a predetermined number of bobbins on which the child strands are wound and set them in the delivery mechanism. By rotating and moving each bobbin, the strands are twisted while being fed out of the bobbin, Can be formed.

  Then, an insulator is extrusion coated on the outer periphery of the conductor made of a collective strand wire or a collective strand wire using an extrusion molding machine or the like. Moreover, you may provide shields, such as a braid and metal foil, in the outer periphery of this insulator as needed. An insulated wire can be manufactured by the above process.

  Next, the wire harness according to the present invention will be described.

  The wire harness which concerns on this invention comprises the said insulated wire. The insulated wire constituting the wire harness may be a combination of a plurality of the insulated wires, or may be a combination of the insulated wires and an insulated wire not according to the present invention. The number of each electric wire included in the electric wire bundle can be arbitrarily determined, and is not particularly limited.

  The wire harness protection material mainly has a role of covering the outer periphery of the wire bundle in which a plurality of insulated wires are bundled and protecting the internal wire bundle from the external environment or the like. Therefore, it is sufficient if a plurality of insulated wires are bundled together to form a wire bundle, and various shapes such as a tape shape, a tube shape, or a sheet shape can be applied. At this time, a material in which a pressure-sensitive adhesive is applied to at least one surface of a base material formed in a tape shape, a material having a base material formed in a tube shape, a sheet shape, or the like is appropriately selected depending on the application. Can be used. The base material which comprises this wire harness protective material is not specifically limited, The thing similar to the material of the insulator quoted above can be used.

  Hereinafter, embodiments of the present invention will be described in detail.

(Example)
In this example, a copper alloy having a diameter of 0.08 mm was used for the element wire. First, 48 strands were right-twisted to form a child strand, and then 19 strands were further right-twisted to form an aggregate strand, which was used as a conductor. Then, 0.8 mm of an insulator was coated on the outer periphery of the conductor. Further, the outer periphery of this insulator is covered with a braid composed of a copper alloy wire having a diameter of 0.14 mm and a number of punches of 24, a number of 6 and a pitch of 20 mm, and the outer periphery is covered with 0.8 mm of the insulator. An insulated wire having an outer diameter of 7.5 mm was manufactured.

(Comparative example)
A copper alloy having a diameter of 0.08 mm was used for the strand. Then, after twisting 20 strands left to form a child strand, seven strands of this strand are twisted right to form an aggregate strand, and further, 7 strands of this assembly strand are right twisted A conductor was used. Then, 0.8 mm of an insulator was coated on the outer periphery of this conductor. Further, the outer periphery of this insulator is covered with a braid composed of a copper alloy wire having a diameter of 0.14 mm and a number of punches of 24, a number of 6 and a pitch of 20 mm, and the outer periphery is covered with 0.8 mm of the insulator. An insulated wire having an outer diameter of 7.5 mm was manufactured.

  About the insulated wire of the Example and comparative example which were manufactured as mentioned above, the bending test was done and both were compared.

(Bending test)
In the bending test, an insulated wire having a predetermined length was straightened, bent in one direction to a bending radius of 30 mm, this was repeated, and the number of times when even one conductor wire was broken was measured and evaluated. .

  As a result of the bending test, the conductor wire was disconnected after 400,000 times in the comparative example, whereas the wire was not broken even when bent 2.5 million times in the example, and the bending resistance was greatly improved. I was able to confirm that it was possible.

  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.

  The insulated wire according to the present invention can be suitably used for a power line for a vehicle such as an automobile.

It is a cross-sectional schematic diagram showing the insulated wire which concerns on one Embodiment of this invention. It is a cross-sectional schematic diagram showing the insulated wire which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Insulated electric wire 12 Elementary wire 14 Child strand wire 16 Aggregate strand wire 18 Insulator

Claims (2)

  An insulated wire having a conductor and an insulator coated on an outer periphery of the conductor, wherein the conductor is a stranded wire obtained by twisting a plurality of strands at once, or a plurality of strands are twisted together An insulated wire comprising a plurality of strands of twisted strands and a collective strand of wires twisted in the same direction as the twist direction of all strands of strands.   A wire harness comprising the insulated wire according to claim 1.

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