JP5468412B2 - Shield wire and method for forming the shield wire - Google Patents

Description

  The present invention relates to a shielded wire and a method for forming the shielded wire, and particularly to obtain a stable shielding performance by bringing a shield layer into close contact with the outer periphery of a core wire.

  Electronic control devices mounted on automobiles are rapidly increasing, as signal lines for inputting detection signals from sensors, switches, etc. to the electronic control unit, and signal lines for outputting control signals from the electronic control unit to the electronic control device, A shielded wire having a noise removal function is used.

  As a kind of the shield wire, as shown in FIGS. 8 (A), (B), and (C), in Japanese Patent Laid-Open No. 2000-251548, a core wire 100 and a drain wire 101 are wired in parallel, and the core wire and the drain wire are connected. A metal foil tape 102 is spirally wound around the outer periphery of the wire focusing body to form a shield layer. Further, as described in paragraph 0026, an insulating tape is wound around the outer periphery of the metal foil tape. The drain wire 101 peels off the insulating coating layer to expose the core wire 101a, the core wire 101a is brought into contact with the metal foil tape 102, and the terminal T connected to the terminal is grounded.

JP 2000-251548 A

  In the shield wire described in Patent Document 1 and a shield wire in which this type of metal foil is wound around the outer periphery of the core wire and the drain wire to form a shield layer, the metal foil tape is wound around the outer periphery of the core wire and the drain wire. In such a case, it is difficult to obtain a sufficient contact pressure. Therefore, there is a problem that the metal foil tape is lifted from the outer peripheral surface of the core wire or the drain wire, and a void is easily generated. Further, as shown in FIG. 8C, there is a problem that even if the contact between the drain wire 101 and the metal foil tape 102 becomes a line contact or a surface contact, the contact area is small and it is difficult to obtain a stable shielding performance.

  The present invention intends to solve the above problem, and allows the metal foil tape to be wound around the outer peripheral surface of the core wire and the drain wire without any gap, and in particular, to contact the metal foil tape to the entire peripheral surface of the drain wire. It is an object to increase the contact area by winding as much as possible so that stable shielding performance can be obtained.

In order to solve the above-mentioned problems, the present invention provides a core wire in which a core wire is covered with an insulating resin layer, a single drain wire, and a metal foil that is wider than the added value of the outer peripheral lengths of the core wire and the drain wire. It consists of a shield tape made of tape and an insulating resin tape,
The core wire and the drain wire are twisted in a state of sandwiching the shield tape, and the twisted shield tape is wound around and coated on the outer periphery of the core wire and the drain wire. A shielded wire is provided in which the insulating resin tape is wound around an outer periphery of a shield tape wound around.

The number of core wires may be one, or a plurality of core wires such as three may be used as in the conventional example shown in FIG.
The shield tape is preferably disposed along the entire length of the core wire and the drain wire, and the core wire and the drain wire are twisted over the entire length with the shield tape interposed therebetween. In particular, when the core wire is a noise generating electric wire, it is preferable to provide a shield layer over the entire length to block noise to the outside.

  Furthermore, although the shield tape is disposed over the entire length of the core wire and the drain wire, it may be partially twisted in a region that receives noise. Alternatively, only in the area that receives noise, a drain line and a shield tape may be arranged along the core line and twisted to partially form a shield line. In this case, an electric wire in which a shielded wire region and a non-shielded wire region are mixed in the length direction can be obtained.

As the metal foil tape, an aluminum foil tape, a copper foil tape or the like is used.
As the insulating resin tape, a vinyl chloride tape, polyethylene terephthalate or the like having an inner peripheral surface coated with an adhesive is used.

As a method of forming the shield wire of the present invention, the core wire and the drain wire are twisted in a state where the shield tape is sandwiched between the core wire and the drain wire, and the shield tape is used for the core wire and the drain wire. Wrap around the entire outer surface,
Thereafter, a method of forming a shield wire is provided in which an insulating resin tape having an inner surface coated with an adhesive is wound around the outer periphery of the shield tape.

More specifically, when the number of the core wires is one, the central axes of the core wires and the drain wires are twisted so that the center lines in the width direction of the shield tape coincide with each other.
The insulating resin tape may be wound around the outer peripheral surface of the shield tape by any of sushi winding, worship winding, and spiral winding.

  Twist the shield tape so that there is no gap between the core wire and the drain wire during twisting, and twist the insulating resin tape around the outer peripheral surface of the shield tape without any gap. Yes.

As described above, the shield wire of the present invention is formed by twisting (twisting) one core wire or a plurality of converged core wires and one drain wire with a metal foil tape interposed therebetween. Thus, one side of the metal foil tape in the width direction can be wound around the entire outer peripheral surface of the core wire, and the other side of the metal foil tape can be wound around the entire outer peripheral surface of one drain wire. In addition, since the core wire and the drain wire are twisted with the metal foil tape interposed therebetween, the metal foil tape can be tightly wound around the core wire and the drain wire, respectively, and the metal foil for the core wire and the drain wire can be wound. A sufficient contact pressure of the tape can be secured, and the metal foil tape can be prevented from floating and causing a gap.
In addition, since the insulating resin tape is wound around the outer peripheral surface of the metal foil tape, no gap is generated between the metal foil tape and the insulating resin tape functioning as the outermost sheath, and the metal foil tape is a core wire. In addition, the drain wire can be closely adhered to the outer peripheral surface of the drain wire.

  As described above, since the shield wire of the present invention has a configuration in which the metal foil tape is twisted between the core wire and the drain wire, the shield layer made of the metal foil tape has the outer peripheral surface of the core wire and the drain wire. The outer peripheral surface can be brought into contact with each other with a large contact area and sufficient contact pressure, and the shield performance can be stabilized.

The shield wire of 1st embodiment of this invention is shown, (A) is a perspective view, (B) is BB sectional drawing of (A), (C) is CC sectional view taken on the line of (A), (D) is the DD sectional view taken on the line of (A). The relationship between a core wire, a drain wire, and a shield tape is shown, (A) is a perspective view, (B) is sectional drawing. (A), (B), and (C) are drawings showing a shield wire forming step. It is drawing which shows the state which connected the terminal to the terminal of a shield wire. (A) (B) is drawing which shows 2nd embodiment. It is a perspective view which shows 3rd embodiment. It is the schematic which shows 4th embodiment. (A) (B) (C) is drawing which shows a prior art example, (C) is CC sectional view taken on the line of (B).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment.
The shield wire 1 according to the first embodiment includes one core wire 2, one drain wire 3, a shield tape 4 made of a metal foil tape, and an insulating resin tape 5.

The core wire 2 is formed by covering a core wire 2a, which is a combination of strands made of a copper-based metal wire, with an insulating resin layer 2b.
The drain wire 3 is only a stranded wire made of a copper-based metal wire or only a single core wire made of a copper-based metal wire, has no insulating resin layer, and a ground terminal or a connector terminal can be crimped to the terminal.
The shield tape 4 made of a metal foil tape is made of an aluminum foil tape or a copper foil tape. In this embodiment, an aluminum foil tape is used. As shown in FIG. 2, the width W1 of the shield tape 4 is not less than the sum of the outer peripheral length L1 of the core wire 2 and the outer peripheral length L2 of the drain wire 3 (W1 ≧ L1 + L2).
The insulating resin tape 5 is made of a vinyl chloride tape, polyethylene terephthalate, etc. with an adhesive applied on the inner surface, and in the present embodiment, made of a vinyl chloride tape.

  The shield wire 1 is twisted over the entire length of the core wire 2 and the drain wire 3 with the shield tape 4 sandwiched between them, and the one side portion 4a in the width direction of the shield tape 4 is arranged almost on the entire outer peripheral surface of the core wire 2. The other side portion 4b of the shield tape 4 is wound around the entire outer peripheral surface of the drain wire 3 by substantially entire surface contact. In addition, the insulating resin tape 5 is wrapped around the outer peripheral surface of the shield tape 4 so as to be covered.

The shield wire 1 is formed as shown in FIGS.
As shown in FIG. 3A, the core wire 2 and the drain wire 3 are disposed in parallel, and the shield tape 4 is disposed therebetween. At that time, each one core line and the center line of the drain line 3 are made to coincide with each other, and the center line Wo in the width direction of the shield tape 4 is made to coincide with each other and overlap each other.

Next, as shown in FIG. 3B, the core wire 2, the drain wire 3, and the shield tape 4 are integrally twisted from one end in the length direction (that is, twisted) to sandwich the shield tape 4 In this state, the core wire 2 and the drain wire 3 are twisted wires.
In this twisting operation, when the core wire 2 and the drain wire 3 are gripped to form a twisted wire, the shield tape 4 is wound around the outer periphery of the core wire 2 and the drain wire 3 that become the twisted wire. As a result, as shown in FIGS. 1B and 1C, one side portion 4a of the shield tape 4 is wound around the entire outer peripheral surface of the core wire 2, and the other of the shield tape 4 is wrapped around the entire outer peripheral surface of the drain wire 3. The side part 4b is wound. Thereby, both the core wire 2 and the drain wire 3 are covered with the shield tape 4 on the entire outer peripheral surface thereof.
In addition, during twisting operation, the shield tape 4 is twisted with sufficient torsional force without lifting up from the outer peripheral surfaces of the core wire 2 and the drain wire 3, and the shield tape is in contact with the outer peripheral surfaces of the core wire 2 and the drain wire 3 without any gaps. Let

  Finally, as shown in FIG. 3C, an insulating resin tape is provided on the outer peripheral surface of the core wire 2, the drain wire 3, and the shield tape 4 integrated by twisting, that is, on the outer periphery of the shield tape 4 positioned on the outer peripheral surface. 5 is wound in a wrinkle shape, and the overlapping end portion of the insulating resin tape 5 is fixed with an adhesive (not shown) applied to the inner surface. Thereby, the shield wire 1 shown in FIG. 1 is formed.

  In the shield wire 1 formed as described above, the entire outer peripheral surfaces of the core wire 2 and the drain wire 3 are covered with the shield tape 4, and the core wire 2 and the drain wire 3 are not lifted up. Since it is in contact with the entire outer peripheral surface, the shield function of the core wire 2 can be stabilized.

The shield wire 1 of the present invention is preferably formed continuously as a long electric wire and cut to a required length during use.
As shown in FIG. 4, after the shield wire 1 having a predetermined length is formed, the shield tape 4 and the insulating resin tape 5 are peeled off at both ends of the shield wire 1, and the ends of the core wire 2 and the drain wire 3. In the core wire 2, the terminal T1 is connected to the exposed core wire 2a by further peeling the insulating resin layer 2b. The terminal T2 is also connected to the terminal of the drain wire 3.
The shielded wire 1 of the present invention is converged with other electric wire groups to form a wire harness, or the shielded wire 1 alone is wired inside the automobile, and the drain wire 3 of the shielded wire 1 is grounded.
Similarly to the conventional example shown in FIG. 8, the core wire and the drain wire may have predetermined lengths, and the terminal may be crimped to the terminal. That is, you may twist the core wire and drain wire which attached the terminal to the terminal on both sides of the shield tape.

FIG. 5 shows a second embodiment.
In the second embodiment, the only difference from the first embodiment is that there are three core wires.
Three core wires 2A, 2B, and 2C are overlapped and converged, twisted with one drain wire 3 and shield tape 4 interposed therebetween, and then the insulating resin tape 5 is wound by half wrap winding. Other configurations and operational effects are the same as those of the first embodiment, and thus description thereof is omitted.

FIG. 6 shows a third embodiment.
In the third embodiment, the shield tape 4 is disposed over the entire length between the core wire 2 and the drain wire 3, but the core wire 2, the drain wire 3 and the shield tape 4 are twisted only in the region X that receives noise. The twisted electric wire covered with the shield tape 4 is used. Although not shown, if there are a plurality of regions where noise is received, twisting is performed at a plurality of locations. The core wire, drain wire, and shield tape 4 are covered with a resin tube or a corrugated tube (not shown) for insulation protection.
Thereafter, as in the first embodiment, the insulating resin tape is wound and covered.
The shielded wire of the third embodiment is a shielded electric wire that can shield only a region that receives noise.

FIG. 7 shows a fourth embodiment.
Similarly to the third embodiment, the fourth embodiment also shields only the area that receives noise, and the other areas are not shielded.
The covered electric wire 30 is wired as a drain wire along the entire length of the core wire 2, and in a partial region where noise is received, the insulation coating of the covered electric wire 30 is peeled to expose the core wire to form the drain wire 3, and the metal foil A shield tape 4 made of a tape is disposed, and the core wire 2 and the drain wire 3 are twisted with the shield tape 4 sandwiched in the same manner as in the first embodiment, and the insulating resin tape 5 is wound around the outer periphery thereof. The core wire and the covered electric wire 30 are wired in a region other than the region that receives noise. When there are a plurality of core wires 2, the insulating resin tape 5 may be extended and wound around the core wires 2.

  As in the third and fourth embodiments, when the region that receives noise is partial in the entire length of the core wire, only the region that receives noise is a shielded wire, and the region that is not affected by noise is non- When a shielded electric wire is used, an increase in the weight and cost of the electric wire can be reduced.

1 Shield wire 2 Core wire 3 Drain wire 4 Shield tape made of metal foil tape 5 Insulating resin tape

Claims (5)

A core wire in which a core wire is covered with an insulating resin layer, a drain wire, a shield tape made of a metal foil tape wider than the added value of the outer peripheral lengths of the core wire and the drain wire, and an insulating resin tape; Consists of
The core wire and the drain wire are twisted in a state of sandwiching the shield tape, and the twisted shield tape is wound around and coated on the outer periphery of the core wire and the drain wire. A shield wire, wherein the insulating resin tape is wound around an outer periphery of a shield tape wound around the wire.   The shield wire according to claim 1, wherein the number of core wires is one or more. A method for forming a shielded wire according to claim 1 or 2,
Twist the core wire and the drain wire in a state where the shield tape is sandwiched between the core wire and the drain wire, and wind the shield tape around the entire outer peripheral surface of the core wire and the drain wire,
Then, the formation method of the shield wire which winds the insulating resin tape by which the adhesive agent was apply | coated to the inner surface around the outer periphery of the said shield tape.   4. The method of forming a shield wire according to claim 3, wherein the number of the core wire is one, and the core wire and the drain wire are twisted so that the center axis of the core wire and the drain tape are aligned in the width direction.   Twist the shield tape so that no gap is generated between the core wire and the drain wire during twisting, and twist the insulating resin tape around the outer peripheral surface of the shield tape without any gap. The method for forming a shielded wire according to claim 3 or claim 4.

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