JP2012113885A - Shield wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ingress of water from a drain wire of a shield wire.SOLUTION: A single core wire is used as a drain wire by eliminating an insulation coating layer or peeling a part of the insulation coating layer. A shield wire is configured such that, in a state where a core electric wire with a core wire thereof coated with an insulation coating layer and the drain wire are bundled, the bundled wires are coated with a shield layer made of a metal foil tape or a metal braid wire, and the single core wire of the drain wire is contact with the shield layer.

Description

  The present invention relates to a shielded wire, and more specifically, a shield that prevents water from being drained from the end of a drain wire and can be easily assembled as a required length and the number of core wires according to specifications at a construction site or the like. It is about the line.

Conventionally, a shield wire is manufactured by covering the outer periphery of a plurality of core wires with a shield layer made of a tube formed of a metal braided wire, and in this state, an outer layer of a sheath made of an insulating resin is formed by extrusion molding. This type of shield wire is used in a region where noise needs to be removed, and a shield wire having a number of core wires corresponding to the required number of circuits is selected and used.
However, when the area from which noise is removed is a short local area, a metal foil tape is wrapped around the wire that becomes the core wire, or a shield layer is provided through the tube of the metal braided wire, and the shield layer is adhered to the outer layer. Tapes may be wound and shielded wires may be assembled on site.

Both the shielded wire manufactured in the factory described above and the assembly-type shielded wire described later need to connect the drain wire to the shield layer and connect the drain wire to the ground.
In the assembly type shield wire, a drain wire is connected by crimping or soldering a general electric wire to the tip of the shield layer. In the general electric wire, a core wire made of a stranded wire is covered with an insulating coating layer, and the core wire of the drain wire is made of a stranded wire.
Further, the shielded wire 100 shown in FIG. 8 proposed in Japanese Patent Application Laid-Open No. 2000-251548 is also a covered wire in which a core wire 111 made of a twisted wire is covered with an insulating coating layer 112 as a drain wire 110 converging with the core wire 101. Is used. As shown in FIG. 8B, the drain wire 110 and the core wire 101 are converged by winding a metal foil 113 constituting a shield layer.

JP 2000-251548 A

In the shielded wire shown in FIG. 8, the insulating coating layer 112 of the drain wire 110 is peeled off at the portion in contact with the metal foil 113, and the core wire 111 made of a stranded wire is brought into contact with the metal foil 113 to conduct. When water is generated at the location where the insulation coating of the drain wire 110 is peeled off, since the core wire 111 is a stranded wire, the water immersed in the stranded wire moves through the core wire 111 by capillary action and is connected to the tip. Reach 130. Therefore, even if the terminal 130 is inserted and locked to the waterproof connector, there is a possibility that water may enter the waterproof connector through the core wire 111 of the drain wire 110.
It is very difficult to remove the water soaked in the waterproof connector, and there is a possibility that the resistance value of the terminals in the connector is increased due to rusting or rusting, resulting in an electrical failure.

  The present invention has been made in view of the above problems, and can easily assemble a shielded wire as necessary in field construction, etc., and further prevents the occurrence of water intrusion from the drained wire of the shielded wire. It is an object of the present invention to provide an assembly-type shield wire that can reliably prevent water from entering a waterproof connector through a terminal connected to the terminal.

In order to solve the above problems, the present invention uses a single-core wire as a drain wire without an insulating coating layer or by partially peeling the insulating coating layer,
In a state where the core electric wire whose core wire is covered with the insulating coating layer and the drain wire are bundled, the core wire is covered with a shield layer made of a metal foil tape or a metal braided wire, and the single core wire of the drain wire is brought into contact with the shield layer. Providing shielded wires characterized by assembly.

  As described above, in the present invention, since a single core wire that is not a stranded wire is used as the drain wire, the core wire made of the single core wire has no insulation coating layer and the insulation coating layer is partially peeled off. In any case, even if water is applied to the exposed portion of the single core wire, the water cannot enter the inside of the single core wire. Therefore, even if the terminal connected to the drain wire terminal is inserted and locked into the waterproof connector, it is possible to prevent water from entering the waterproof connector through the core wire of the drain wire.

The outer peripheral surface of the shield layer may be half-wrapped with an adhesive tape as an exterior material or passed through a resin round tube or corrugated tube.
With the above configuration, the outer layer can be formed with the same insulating layer as the sheath of the conventional shielded wire, and it is possible to prevent the shield layer from coming into contact with the external interference material made of a metal material and causing a short circuit.

The shielded wire of the present invention is suitably used as a shielded wire that is assembled on site. That is, in the area where noise blocking is required or the entire length of the electric wire, the electric wire is used as a core wire, the drain wire is attached to the core wire, and a metal foil tape is wrapped around the outer periphery of the core wire and the drain wire to shield it. Can be assembled as a line.
In other words, the number of electric wires corresponding to the number of circuits required at the time of construction can be used as the core wires, and the electric wires having an energization amount adapted to each circuit can be used as the core wires. As a result, the plurality of core wires may be made of wires having the same diameter, or may be made of different wire diameters or different wire types. Thus, a shielded wire having necessary characteristics can be easily assembled at the construction site.
Therefore, the shield wire of the present invention is composed of an arbitrary number of wires of which the core wire has the same diameter, different diameter, or different types.

It is preferable to use an enameled wire as the drain wire.
The enameled wire is provided with an insulating coating layer made of an insulating coating on the outer peripheral surface of a single core wire.
When the enameled wire is used, the diameter of the drain wire bundled with the core wire can be reduced, so that the entire shield wire can be reduced in diameter. In addition, if the single core wire used as the drain wire is enameled wire, there is an advantage that it can be easily obtained when assembled on site.

  The shield wire is covered with the shield layer from a position where a required dimension is opened from the drain wire and the end of the core wire, and the terminal is crimped, ultrasonically welded or resistance welded to the single core wire of the drain wire, and the end of the core wire. It is preferable that the terminals are crimped to each other and these terminals are connected to the connector.

  As described above, since the shield wire of the present invention uses a single core wire that does not cause water immersion as the core wire of the drain wire, even if water is applied to the core wire exposed portion of the drain wire to be brought into contact with the shield layer, No flooding occurs, and the occurrence of flooding in the connector into which the terminal connected to the drain wire terminal is inserted can be reliably prevented. As a result, there is an advantage that it is possible to prevent rusting of the terminals in the waterproof connector and to prevent electrical connection failures due to an increase in electrical resistance due to the rusting.

  Furthermore, a shielded wire can be easily assembled just by wrapping a metal foil tape etc. that condenses a single core wire such as an enameled wire as a core wire and a single wire as an enameled wire, and is necessary where a shielded wire is required. It is possible to attach a shielded wire with a large number of circuits.

(A) is a front view which shows the core wire and drain wire which comprise the shield wire of 1st Embodiment, (B) is sectional drawing of a core wire, (C) is sectional drawing of a drain wire. (A) is a perspective view of the shield line of the first embodiment, and (B) is a cross-sectional view taken along the line BB of (A). It is use explanatory drawing of the shield wire of the said 1st Embodiment. It is sectional drawing of the shield wire of 2nd Embodiment. (A) is drawing which shows the 1st modification of the shield wire of 2nd Embodiment, (B) is drawing which shows a 2nd modification. The shield wire of 3rd Embodiment is shown, (A) is a perspective view, (B) is a front view of a drain wire. It is a perspective view which shows the shield wire of 4th Embodiment. (A) (B) is drawing which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show the shield wire of the first embodiment.
The shield wire 1 is formed by bundling four wires of three core wires 2 (2A, 2B, 2C) and one drain wire 3 made of enamel wire, and winding a metal foil tape 4 to form a shield layer 5. Assembled. The metal foil tape 4 is wound around the winding start end and winding end end with an adhesive tape (not shown) in a wound state, and the wound state is maintained.

  The enameled wire that becomes the drain wire 3 shown in FIG. 1C is a single core wire in which the core wire 3a is a single wire, and is not a core wire formed by twisting a number of strands into a twisted wire. A coated insulating coating 3b is formed on the outer peripheral surface of the core wire 3a made of the single core wire.

  The drain wire 3 made of the enameled wire has the insulating coating 3b peeled off at a part in the length direction to expose the core wire 3a, and is exposed to the metal foil tape 4 wound around the outer peripheral surface. 4 and the core wire 3a of the drain wire 3 are electrically connected.

The shield wire 1 projects the core wire 2 and the drain wire 3 from the tip of the metal foil tape 4 forming the shield layer 5 with a required length of at least 40 mm, and the terminal 6 (6A to 6D) is projected to the projected terminal. ). The drain wire 3 protruded outside from the tip of the shield layer 5 has a terminal to be crimped to the terminal 6 peeled off the insulating coating 3b, but the other part is left in a state where the insulating coating 3b is applied. Yes.
As shown in FIG. 1B, the core wire 2 has a core wire 2a made of a stranded wire covered with an insulating coating layer 2b, and the insulating coating layer 2b is peeled off at the terminal side to expose the core wire 2a. A terminal 6 is connected to 2a.

  As shown in FIG. 3, the terminals 6 (6A to 6D) connected to the terminals of the core wire 2 and the drain wire 3 are inserted into the waterproof connector 8 with a rubber plug 7 attached to the connection portion with the terminal 6, as shown in FIG. It has stopped.

  In the shielded wire 1 of the present invention, since the core wire 3a of the drain wire 3 is formed of a single core wire, water is generated at the winding start position of the metal foil tape 4, and the drain wire 3 passes through the inside of the metal foil tape 4. Even when the insulating coating 3b is peeled off and the core wire 3a is exposed, water does not enter the core wire 3a. Therefore, it is possible to reliably prevent water from passing through the inside of the waterproof connector 8 through the terminal 6 of the terminal through the inside of the core wire 3a.

  Further, since the shield wire 1 is simply assembled by collecting the drain wire 3 composed of the core wire 2 and the enamel wire and wrapping the metal foil tape 4, any number of wires having a required energization amount can be used as the core wire 2. It can be selected and used. Therefore, it can be easily assembled as a shielded wire simply by attaching a drain wire made of an enameled wire to a group of electric wires in a region where noise needs to be cut off and winding the metal foil tape 4 around the outer periphery thereof.

FIG. 4 shows the shield wire of the second embodiment.
The shield wire 1-A corresponds to a sheath (outer skin) of a general shield wire by winding the metal foil tape 4 around the drain wire 3 composed of the core wire 2 and the enamel wire and then winding the adhesive tape 11 in half wrap. An insulating resin outer layer is formed.
With this configuration, it is possible to prevent the conductive metal foil tape 4 from being exposed to the outside and causing a short circuit due to interference with a metal external interference material.

FIGS. 5A and 5B show a modification of the second embodiment.
The shield wire 1-B of the first modified example of FIG. 5A is in a state where the core wire 2 and the drain wire 3 are wound around the hollow portion of the resin round tube 12 with the metal foil tape 4 and converged. The round tube 12 is inserted into the insulating resin outer layer.
The shield wire 1-C of the second modified example of FIG. 5B is formed by covering a corrugated tube 13 made of resin with the core wire 2 and the drain wire 3 wrapped with a metal foil tape 4 and converging. The tube 13 is an insulating resin outer layer.

FIG. 6 shows a shield wire 1-D of the third embodiment.
The shield wire 1-D uses a single-core wire in which the shield layer 5 is formed of a metal braided tube 14, and the drain wire 3 is a single-core wire in which a core wire 3d made of a copper-based metal is covered with an insulating resin layer 3e. .
The drain wire 3 is made conductive by peeling off the insulating resin layer 3 e at a portion where the metal braided tube 14 is covered, and bringing the exposed single core wire 3 d into contact with the metal braided tube 14.
Since the shield wire 1-D also uses the core wire 3a of the drain wire 3 as a single core wire, the core wire is not flooded, and it is possible to prevent the water from flowing into the connector through the core wire.

FIG. 7 shows a shield wire 1-E of the fourth embodiment.
The shield wire 1-E is different from the first embodiment in that the number of core wires 2 is one, and the other configuration is the same as that of the first embodiment.
Thus, even if there is only one core wire 2, if it is necessary to block noise in the core wire 2, a drain wire 3 made of enameled wire is attached, and a metal foil tape 4 is wrapped around it as a shield wire Easy to assemble.

DESCRIPTION OF SYMBOLS 1 Shield wire 2 (2A-2C) Core wire 2a Core wire 2b Insulation coating layer 3 Drain wire 3a Core wire (single core wire)
3b Insulating coating 4 Metal foil tape 5 Shield layer
6 (6A-6D) Terminal 7 Rubber stopper 8 Waterproof connector

Claims (5)

Use a single-core wire as a drain wire without an insulating coating layer or by partially peeling the insulating coating layer,
In a state where the core electric wire whose core wire is covered with the insulating coating layer and the drain wire are bundled, the core wire is covered with a shield layer made of a metal foil tape or a metal braided wire, and the single core wire of the drain wire is brought into contact with the shield layer. A shielded wire that is assembled.   The shield wire according to claim 1, wherein the outer peripheral surface of the shield layer is half-wrapped with an adhesive tape as an exterior material, or is outer layered with a resin round tube or corrugated tube.   The shield wire according to claim 1, wherein the core wire is formed of an arbitrary number having the same diameter or different diameters.   The shield wire according to any one of claims 1 to 3, wherein an enameled electric wire is used as the drain wire.   The shield wire is covered with the shield layer from a position where a required dimension is opened from the drain wire and the end of the core wire, and the terminal is crimped, ultrasonically welded or resistance welded to the single core wire of the drain wire, and the end of the core wire. The shield wire according to any one of claims 1 to 4, wherein terminals are crimped to each other, and these terminals are connected to the connector.

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