JPH07153324A - Drain wire for shielded electric wire - Google Patents

Abstract

PURPOSE:To simplify a drain circuit composed of the drain wire for a shielded electric wire and at the same time to lower the cost for formation of the drain circuit. CONSTITUTION:A rigid core body 10 which is positioned in the center of a drain wire 4, penetrates a wire in its longitudinal direction, and has necessary rigidity is used as a core. The drain wire 4 of a shielded electric wire is characterized in such a way that a group of elemental wires 5 are coiled around and struck to the outer circumference of the rigid core body 10 and necessary flexibility and sufficient rigidity are given thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for electric wiring of electronic devices and automobiles, and wraps a core wire of a signal conductor in a sheath layer to prevent adverse effects of external electromagnetic waves on the core wire. The present invention relates to a "drain wire" of a shielded electric wire that prevents leakage of electromagnetic waves from the core electric wire to the outside.

[0002]

2. Description of the Related Art A shielded electric wire 1 is shown in FIG. 4, in which a core wire 2 for a signal is wrapped in a sheath layer 3 and a drain wire 4 is inserted in the sheath layer 3 and wound around the core electric wire 2. The drain wire 4 needs to have the flexibility to be wound around the core electric wire 2, and therefore has a flexible twisted wire structure in which the wires 5 are twisted together. The drain wire 4 drawn from the end of the sheath layer 3 together with the core electric wire 2 has a ground terminal 6 crimped to the end thereof, and a terminal accommodating chamber 9 of a connector 8 into which a terminal 7 of the core electric wire 2 is inserted. Insert the ground terminal 6 and connect the connector 8
Is connected to the mating connector, the drain wire 4 is connected and conducted to the vehicle body or the like to form a drain circuit of the shielded electric wire 1.

However, as shown in FIG. 4C, the ground terminal 6 is directly provided on the highly flexible drain wire 4 and when it is inserted into the terminal accommodating chamber 9, it is held by a fingertip and pushed backward. The drain wire 4 bends very easily and the ground terminal 6
Becomes difficult to insert. Therefore, as shown in FIG. 4D, the secondary drain wire 13 of the covered electric wire having bending rigidity is connected and connected to the drain wire 4 via the relay terminal 14, and the ground provided on the secondary drain wire 13 is connected. A measure for forming a drain circuit by inserting the terminal 6 into the terminal accommodating chamber 9 is generally adopted.

[0004]

In the conventional secondary drain wire structure described above, the ground terminal 6 can be accurately inserted and locked in the terminal accommodating chamber 9, but the secondary drain wire 13 and the relay terminal 14 are not connected to each other. Since the work of preparing and connecting and connecting them is required, the structure becomes complicated, and labor is required for forming the drain circuit, resulting in high cost. The present invention provides a drain wire of a shielded electric wire that solves the above-mentioned drawbacks of the prior art.

[0005]

The drain wire of the shielded electric wire of the present invention for solving the above technical problems is described as follows: "A rigid core body having a required rigidity is provided at the center of the longitudinal direction of the wire body to form a core. In addition to the above, a first invention of "a structure in which a group of strands is disposed on the outer periphery of the rigid core and the strands of wire serve as an electrical conducting portion" and "a linear rigid core having a required rigidity is used as a core. None, a structure in which a conductive layer made of a conductive material is provided on the outer circumference of the rigid core ". The drain wire of the first aspect of the invention is arranged by winding or adhering a group of wires around a rigid core.

That is, the rigid core is intended to impart rigidity so that the ground terminal provided at the end of the drain wire can be accurately inserted into the terminal accommodating chamber of the connector. A resin wire is used. The rigid core body is integrated with the wire group or the conductive layer existing on the outer circumference to form a single electric conduction wire.

[0007]

[Operation] The drain wire configured as above is made of the material of the rigid core.
By setting the shape, it is possible to harmonize the flexibility required as a drain wire and the appropriate rigidity that can accurately insert and lock the ground terminal, so it is necessary as a drain wire. It is possible to have both an electric wire function and a ground circuit forming function by properly inserting and locking the ground terminal. Further, since the relay terminal 14 and the secondary drain wire 13 become unnecessary and the ground terminal of the drain wire can be directly inserted into the connector, the work of forming the drain circuit of the shielded wire and the drain circuit structure are simplified.

[0008]

Embodiments will be described in detail below based on embodiments. First, referring to FIG. 1 showing an embodiment of the first invention, in a shielded electric wire 1 in which a core wire 2 for signal and a drain wire 4 conducting with the core electric wire 2 are provided in a sheath layer 3,
The drain wire 4 has a rigid core body 10 made of vinyl chloride resin, which is located at the central portion of the drain wire 4 and penetrates in the lengthwise direction as a core, as shown in FIG. , A group of wires 5 forming an electrically conductive portion as the drain wire 4 are spirally wound and adhered, and the rigid core body 10 and the group of wire 5 are integrated, and the outer periphery serves as an electrically conductive portion. It has an electrical conduction line structure.

That is, the rigid core body 10 has such a shape that the drain wire 4 is wound around the core electric wire 2 so that the drain wire 4 can be provided with a necessary flexibility capable of functioning as a drain wire of the core electric wire 2 and an appropriate rigidity. A wire body having a set material is formed, an adhesive 11 is applied to the outer periphery of the wire, and a group of 5 wires wound around the adhesive 11 is integrally bonded and disposed. The drain wire 4 having the rigid core 10 as a core is directly connected to the ground terminal 6 at the end, and the middle of the drain wire 4 is held with a fingertip to push the ground terminal 6 back into the terminal accommodating chamber 9. However, due to the insertion resistance of the ground terminal 6, the drain wire 4 has a rigidity such that the middle of the drain wire 4 is not easily buckled or bent and the ground terminal 6 is inserted into the terminal accommodating chamber 9 accurately and easily. It can be worn and locked. Since the drain wire 4 is formed by bonding and arranging the group of strands 5 to the rigid core body 10 serving as a core, there is no possibility that the strands 5 will come off the rigid core body 10 or come apart. The shape as a line is stable.

The ground wire 6 is directly crimped to the end of the drain wire 4 and the ground wire 6 is directly attached to the connector 8.
Is connected to the vehicle body and grounded, and functions as a drain wire of the shielded electric wire 1. According to the drain wire 4 of the embodiment of FIG. 1, since the secondary drain wire 13 and the relay terminal 14 in the conventional structure are useless and the connection processing of the relay terminal 14 is unnecessary, the drain circuit of the shielded electric wire 1 can be formed. The simplification and the cost for forming the drain circuit can be reduced. The disposition of the strands 5 on the rigid core wire 10 in the first aspect of the present invention is as shown in FIG. 2, in which the strands 5 are directly wound around the rigid core wire 10 without using an adhesive, or the straight strands 5 are attached. May be adhesively arranged.

An embodiment of the second invention will be described with reference to FIG. That is, in the core having the same rigid core 10 as in the above-mentioned embodiment, the conductive layer 12 made of a coating layer of conductive paint is integrally provided on the outer periphery of the rigid core wire 10, and the conductive layer 12 is drained. It constitutes the conducting part of the wire. The embodiment of FIG. 3 has the above-described function as a drain wire, and has a compact shape to further reduce the cost.

[0012]

As described above, the drain wire of the shielded electric wire of the present invention has the effects of simplifying the drain circuit of the shielded electric wire and reducing the cost for forming the drain circuit.

[Brief description of drawings]

FIG. 1 shows a drain wire of a shielded electric wire according to an embodiment of the first invention, where (A) in the drawing is a front view of the shielded electric wire, (B) in the drawing is a sectional view of the drain wire, and ( C) is an explanatory diagram of the drain circuit by the drain line

FIG. 2 is a cross-sectional view of the drain line of another embodiment of the first invention.

FIG. 3 is a cross-sectional view of the drain wire of the shielded electric wire according to the second embodiment of the invention.

FIG. 4 shows a structure of a conventional shielded wire and a drain wire, (A) in the figure is a structural explanatory view of the shielded wire, (B) is a cross-sectional view of the drain wire, and (C) (in the figure). D) is an explanatory diagram of the formation of the drain circuit

[Explanation of symbols]

 1 Shielded Wire 2 Core Wire 3 Sheath Layer 4 Drain Wire 5 Elementary Wire 6 Ground Terminal 8 Connector 9 Terminal Housing 10 Rigid Core 11 Adhesive 12 Conductive Layer

Claims (3)

[Claims] 1. A wire core is provided by penetrating a rigid core body having a required rigidity at the center in the longitudinal direction of the wire body to form a core, and arranging a wire group on the outer periphery of the rigid core body. A drain wire of a shielded electric wire characterized by a structure in which a group serves as an electric conduction part. 2. The drain wire of the shielded electric wire according to claim 1, wherein the wire group is adhered to the rigid core body. 3. A drain wire of a shielded electric wire, which has a structure in which a linear rigid core body having a required rigidity is used as a core, and a conductive layer made of a conductive material is provided on an outer periphery of the rigid core body.