JP2001357732A - Shield wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield wire hard to be damaged, and in which connection work of a ground terminal is easy when ground connection is made. SOLUTION: A spiral tube 11 is installed wherein a long body that is formed by a highly electro-conductive resin is formed and be wound in a spirally wound state, and the spiral tube is wound around the plural electric wires, and an electric wire group W is bound by the spiral tube and a shield property is given.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded electric wire, and more particularly, to a method for easily adding a shield function to electric wires routed to an automobile.

[0002]

2. Description of the Related Art FIG.
A configuration as shown in (A) and (B) is known.
The shielded electric wire 1 shown in FIG. 6A is generally called a metal foil shielded electric wire, and a metal foil tape 5 made of copper foil or the like is provided on the outer periphery of the electric wire 3 and the drain wire 4. Is covered with a sheath 7 made of insulating resin. The shielded electric wire 2 shown in FIG. 6 (B) is generally called a shielded electric wire,
A metal wire 6 made of a tin-plated soft copper wire or the like is provided on the outer periphery in a horizontal winding shape, and the periphery thereof is covered with a sheath 7.

[0003] These types of conventional shielded wires are excellent in ductility and malleability as members to be provided for imparting shielding properties (hereinafter referred to as "shielding materials"). Copper, which is a material that can be easily processed, is used. Although copper has excellent shielding properties, it is an extremely soft material and has a problem that it is easily damaged.If the copper is processed into a foil or thin wire, it is easily damaged from the surface of the shape. Therefore, the shield material is covered with a sheath made of a thick insulating resin layer.

[0004]

As described above, in the conventional shielded electric wire, it is necessary to cover the electric wire with a shield material and further cover the outer periphery with a sheath made of an insulating resin. However, there is a problem that the manufacturing cost is increased. In addition, since it is manufactured in a state covered with a shielding material and a sheath, the number of shielded wires, the combination of wire colors and the sheath color are specified, and the number of wires, the combination of wire colors, There is a problem that you can not change the color of.

When the shield material is connected to the ground,
In the metal foil shielded electric wire 1 of the type shown in FIG.
It was necessary to cut off a part of the sheath 7 so as not to damage the soft metal foil 5, expose the drain wire 4 from the sheath 7, and provide a ground terminal at the tip. Also, in the shielded electric wire 2 of the type shown in FIG. 6 (B), a part of the sheath 7 is cut off so as not to damage the soft metal wire 6, the exposed metal wires 7 are bundled, and the tip is twisted. Therefore, it was necessary to process the ground terminal so as to be connectable, and then to provide the ground terminal.

At the time of connecting the ground terminal, it is necessary to remove the sheath 7 from the conventional shielded wire covered with the sheath 7 over the entire length. This sheath cutting operation requires careful attention so as not to damage the soft copper foil 5 or the fine copper wire 6, and even if a dedicated tool is used, it is still a troublesome operation and it takes time and effort. It was a work and was a bottleneck in the process.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and does not require the sheath to be removed for ground connection, and can be easily bent when mounted on a vehicle body and the like. It is an object of the present invention to provide a shielded wire in which the number of wires and the color of the sheath can be easily changed by reducing the number of wires, and if necessary, a shield function can be provided only in a required section in a later step. I have.

[0008]

In order to solve the above-mentioned problems, in the present invention, there is provided a spiral tube in which a long band formed of a highly conductive resin is habitually wound in a spiral state. In addition, the present invention provides a shielded electric wire characterized by winding the spiral tube around a plurality of electric wires, binding the electric wire group with the spiral tube, and imparting a shielding property.

[0009] A long band formed of a highly conductive resin is formed into a spiral tube in a spirally wound state so as to be easily wound around a group of electric wires. The wire group can be bound simply by winding it around the outer circumference of the wire. In addition, since it is formed of a highly conductive resin, it is possible to impart shielding properties to the bundled electric wires. Further, since the electric wire group is covered with the spiral tube, when this shielded electric wire is attached to the vehicle body, it can be easily bent and routed along the vehicle body.

As the highly conductive resin forming the spiral tube, as disclosed in JP-A-10-237331 and JP-A-11-342522, copper, nickel, iron and the like are used in a thermoplastic resin. With lead-free solder (low melting point solder) and C
A conductive resin composition in which a low melting point alloy such as u powder is dispersed is preferably used.

The thermoplastic resin to which conductive metal fibers are blended includes propylene, polyethylene, polystyrene, acrylonitrile / butadiene / styrene resin, modified polyphenylene oxide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin, aromatic resin Polyamide resin, polyphenylene sulfide resin, liquid crystal polymer, polyetherimide,
Resins such as polybenzimidazole, polyetheretherketone, and polyethersulfone can be used alone or as a blend, and acrylonitrile-butadiene-styrene resin and polybutylene terephthalate resin are particularly preferably used.

As the low melting point alloy which is mixed with the above thermoplastic resin and dispersed and joined in a network, an alloy which has a melting point of 100 ° C. or more, preferably 200 ° C. or more and is melted at the time of injection molding is used. System, Sn-Ag-
Pb system, Sn-Bi system, Sn-Bi-In system, Bi-Pb
System, Bi-Sn system, Sn-Cu system, Sn-Cu-Ni-
P system, Sn-Ag system, Sn-Bi-Pb system, Sn-In
System.

Since a spiral tube made of a highly conductive resin having the above-described composition is used, when the electric wire group is sheathed with this spiral tube, the shielding material is not inferior to conventional copper foil or fine copper wire in material. Sex can be obtained. Also, in terms of shape, by forming it in the form of a spiral tube, it becomes thicker and more durable than conventional forms such as foils and thin wires, and exterior materials such as sheaths, which were conventionally required, are It is not necessary to provide in a place where insulation is not required, and cost can be reduced.

Furthermore, the number of electric wires around which the spiral tube is wound and the combination of the electric wire colors can be easily changed, and the color of the spiral tube can be easily changed.

Further, the spiral tube may be wound around a required section in the length direction of the electric wire group, so that only the required section has a shielding property. That is, the conventional shielded electric wire is manufactured by being covered with a shield material and a sheath over the entire length. However, in the present invention, when assembling the wire harness, the spiral tube is simply wound around the wire group, so the spiral tube is required only in a required section. Can be wrapped to provide a shielding function, and from that point, the cost can be reduced.

In a section where the spiral tube is required to be insulated in an installation section of the spiral tube, an insulating tube is provided on the outer periphery of the spiral tube. As the insulating tube, a general-purpose corrugated tube may be used,
Cylindrical tubes may be used. In each case, a tube having a slit in the axial direction and capable of being sheathed in the spiral tube from the side is suitably used.

Further, a hole for fixing the vehicle body is provided at the tip of the spiral tube, and the spiral tube is fixed to the vehicle body through a bolt through the hole for fixing the vehicle body, and the spiral tube is grounded to the vehicle body. The above-mentioned spiral tube is made of a highly conductive resin having both the electrical characteristics and the inherent characteristics of the resin, and since the strength, thickness, etc. can be sufficiently secured, the spiral tube is provided with a hole through which a bolt fixed to the vehicle body passes. Can be directly provided. Therefore, it is not necessary to separately connect a ground terminal as in the related art, and it is possible to reduce cost, increase work efficiency, improve the finish, and the like.

As a form of earth connection of the spiral tube, the core wire at the other end of the electric wire having the earth terminal connected to the tip may be welded to the spiral tube. When it is desired to ground the shield wire away from the shielded wire, if the core wire at the other end of the wire having the ground terminal connected to the tip is welded directly to the spiral tube, the ground circuit can be easily formed.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a shielded electric wire 10 according to an embodiment of the present invention. Figure 1 shows a shielded wire 1
0 is a perspective view of the spiral tube 11 and a wire group W
Shows a state of being wrapped around the outer periphery of.

The spiral tube 11 is preliminarily formed in a state where a long body formed of a highly conductive resin is spirally (spirally) wound, and is already processed so as to be easily wound. Therefore, the winding work around the wire group W can be easily performed manually, and a spiral tube winding jig may be used.

When the spiral tube 11 is wound around the wire group W, it is shown with a gap in FIG. 1, but is wound without a gap. Further, the spiral tube 11 is wound around the entire length of the wire group W. However, winding may be limited to only a required section.

As described above, since the spiral tube 11 has conductivity only by sheathing the spiral tube 11 in the wire group W, a shielding function similar to the conventional shielded wire shown in FIG. 6 can be provided. .

As shown in FIG. 2A, the shielded electric wire 1 in which the spiral tube 11 is wound around the electric wire group W is provided.
If the spiral tube 11 is fixed to the vehicle body with the clamp 19 and wired, the spiral tube 11 is made of resin and has rigidity, so that the wire group W
Can be held in a shape extending linearly along the routing route, and can be bent at a required position, so that the wire group W can be held in a required shape along the wiring configuration. On the other hand, the conventional shielded electric wire 1 shown in FIG.
In (2), since the shielding material and the sheath have no rigidity,
It cannot be easily held in a flexible wiring configuration together with the electric wire.

Since the spiral tube 11 has conductivity and needs to be connected to the ground, as shown in FIG. 3, a body fixing hole 11a is provided at the tip of the spiral tube 11. This body fixing hole 11a is
6 through the bolt holes (not shown)
Numeral 5 connects the spiral tube 11 to the vehicle body by grounding it by passing it through the vehicle body fixing hole 14 and tightening it into a bolt hole of the vehicle body 16.

As described above, the spiral tube 11 can be directly bolted to the vehicle body 16, and the ground connection configuration can be made very simple.

FIG. 4 shows a case where the ground connection point to the vehicle body is located at a remote position. The core wire is exposed from the other end of the electric wire 17 having the ground terminal 18 connected to the tip, and the core wire is welded to the spiral tube 11. Connected.

Since the spiral tube 11 is grounded to the vehicle body, there is no need to insulate it from the vehicle body, and therefore, there is no need to attach an exterior member corresponding to a sheath made of a conventional shielded wire insulation coating. . However, if there is a section where insulation is necessary because there is a possibility of contact with other electric members, as shown in FIG. The insulating tube 13 is covered. The insulating tube 13 is a vertically cracked tube having a slit 13a in the axial direction, and is placed over the spiral tube 11 from the side in the direction perpendicular to the axis. The insulating tube 13 and the spiral tube 11 are fixed by winding a tape T thereon. In addition, instead of the insulating tube 13,
A general-purpose corrugated tube may be used.

[0028]

As is apparent from the above description, according to the present invention, the wire group is wound by the spiral tube made of the highly conductive resin, so that the shielding property is provided and the wire group is also bound. The required number of electric wire groups can be easily formed into shielded electric wires. Further, the spiral tube has strength and rigidity, so that the wire group can be held along a required wiring route, and because it is a spiral, it can be bent as required.

The ground connection of the spiral tube serving as the shield material can be easily performed by making a hole for fixing the vehicle body in the spiral tube and directly fixing the bolt to the vehicle body. In addition, the wire connected to the ground terminal and the spiral tube can be welded, and in any case, the work of stripping the sheath, which is required for conventional shielded wires, becomes unnecessary, and the number of working steps is reduced. , Easy to do.

When the spiral tube is wound around only a required section or when an insulating tube is provided in a section where the spiral tube is mounted, the section is limited, thereby reducing costs, increasing work efficiency, and improving the finish. Etc. can be achieved even further.

[Brief description of the drawings]

FIG. 1 is a perspective view of a shielded electric wire according to an embodiment of the present invention.

FIG. 2A is a schematic diagram showing a wiring configuration of a shielded electric wire of the present invention, and FIG. 2B is a schematic diagram showing a wiring configuration of a conventional shielded electric wire.

FIG. 3 is a perspective view showing a vehicle body ground connection configuration of the spiral tube shown in FIG. 1;

FIG. 4 is a perspective view showing another form of ground connection.

FIG. 5 is a perspective view showing another embodiment.

6A and 6B are perspective views showing a conventional shielded electric wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 2 Conventional shielded wire 3 Wire 4 Drain wire 5 Metal foil 6 Metal wire 7 Sheath 10 Shielded wire of the present invention 11 Spiral tube W Wire group 13 Insulation tube 14 Body fixing hole 15 Bolt 16 Body 16 Electric wire 18 Earth terminal 19 Clamp

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 3/38 H02G 3/28 F

Claims (3)

[Claims] A spiral tube is formed by spirally winding a long band formed of a highly conductive resin, and the spiral tube is wound around a plurality of electric wires. A shielded electric wire characterized by binding a group and imparting a shielding property. 2. The shield according to claim 1, wherein a hole for fixing the vehicle body is provided at a tip end of the spiral tube, and the spiral tube is fixed to the vehicle body by passing an earth bolt through the hole for fixing the vehicle body to connect the spiral tube to the vehicle body. Electrical wire. 3. The shielded electric wire according to claim 1, wherein a core wire at the other end of the electric wire having a ground terminal connected to the tip is welded and connected to the spiral tube.