JPH07142105A - Structure for grounding shielding wire - Google Patents

Abstract

PURPOSE:To improve the shielding performance, and to reduce the cost of shielding wire by inserting a terminal of a grounding wire into a terminal housing chamber to lock it, and connecting a grounding connection part and a grounding wire for electrical continuity through a conductive plate. CONSTITUTION:A desirable intermediate part of a shielding wire 1 is provided with a grounding connection part 6 by peeling an insulating cover 4 of a sheath layer 3 at a small width to expose a conductive layer 5. A connecting member 10 is installed in this connection part 6. The connecting member 10 is fitted for installation in the connection part 6, and a grounding terminal 23 of a grounding wire 21 is inserted for lock to a terminal housing chamber 9 to form a grounding circuit of the shielding wire 1. A conductive layer contact part 14 of a conductive plate 12 of the member 10 contacts for electrical continuity with the conductive layer 5 of the connection part 6, and a terminal contact part 15 of the conductive plate 12 inserted to the housing chamber 9 contacts for electrical continuity with the grounding terminal 23, and an effective grounding circuit is formed between the conductive layer 5 of the shielding wire 1 and the grounding wire 21 through the conductive plate 12.

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 ground structure 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 wire 1 has a structure in which a core wire 2 of a signal wire is wrapped with a sheath layer 3 having a conductive layer 5 made of a conductive metal net such as an aluminum wire inside an insulating outer cover 4 as shown in FIG. And a ground circuit described below is formed at the end of the shielded electric wire 1. That is, by peeling off a part of the insulating outer cover 4 at the end of the shielded electric wire 1,
The exposed conductive layer 5 is twisted and collected to form a single wire drain wire 2
Processed to 0 and crimping the connector 22 to the drain wire 20 to provide the ground wire 21 and the connector 2 on the vehicle body / device side provided in advance.
2 is connected to form a ground circuit, or a shield wire 1 has a drain wire (not shown) made of a conductive mesh parallel to the core wire 2 provided therein. A part of the sheath layer 3 is peeled off, and the exposed drain wire is made into a single wire shape in the same manner as described above, and the connector 2
2 is crimped and similarly connected to a ground wire provided in advance to form a ground circuit. Then, the drain wire 20 in a single wire state formed at the end of the shielded electric wire 1 is subjected to an insulation treatment such as fitting of a heat shrink tube or tape winding.

On the other hand, as a grounding structure for a shielded electric wire disclosed in Japanese Utility Model Laid-Open No. 4-33268, a blade member having a blade portion for peeling off an insulating sheath of the shielded electric wire and bringing the exposed conductive layer into contact with the conductive layer. There is a publicly known example of a structure in which an earth wire is connected and a blade holding member which is combined with the blade member is mounted and grounded.

[0004]

The former one of the above-mentioned conventional grounding structures is such that the end portion of the shielded electric wire 1 is peeled off, the conductive layer 5 is twisted and gathered to form the drain wire 20 in a single wire state, and Insulating the drain wire 20 by fitting a heat-shrinkable tube to the drain wire 20 is extremely complicated and inferior in workability, resulting in inefficient work, which is contrary to the high productivity of electric wire mass production in recent years. When the conductive layer 5 is twisted and collected to form the drain wire 20 in a single wire state,
It is necessary to peel off the sheath layer 3 of a considerable length (usually about 20
Furthermore, even when crimping the connector 22 to the drain wire of the twisted wire, the drain wire length necessary to fix and hold the drain wire lacking rigidity is required, and therefore the end portion of the shielded wire 1 is peeled off. Has to be made quite long. Therefore, the sheath layer 3 does not exist in these long peeled portions, and there is a quality problem in that the shield performance is lost.

On the other hand, the latter one has a drawback that the structure is complicated and the formability of the connecting member is poor, and in addition, the connecting connection between the ground wire and the connecting member requires labor and it is difficult to obtain sufficient connection strength. , Mass production and low cost are strongly required, and lack of practicability as a shielded electric wire for automobiles in which high durability against vehicle body vibration is essential. The present invention provides a grounding structure for a shielded electric wire which solves the above-mentioned drawbacks of the prior art.

[0006]

The grounding structure of the shielded electric wire of the present invention which solves the above technical problems is as follows: "The insulating outer skin of the sheath layer in the middle portion of the shielded electric wire is peeled to an arbitrary width,
In the earth connection portion exposing the conductive layer of the sheath layer, a connection member main portion in which a terminal accommodating chamber is continuously provided in a winding portion to the earth connection portion, and superposed inside the winding portion, and A connecting member, which is a combination of conducting plates with terminal contact portions extending into the terminal accommodating chamber, is mounted, and a ground terminal at the end of the ground wire is inserted and locked in the terminal accommodating chamber, and the earth is provided through the conducting plate. The structure is such that the connecting portion and the ground wire are electrically connected.

[0007]

The above-described ground structure of the shielded wire of the present invention is
The complicated work of forming the ground circuit by long peeling off the end of the shielded wire in the above-mentioned conventional structure is unnecessary, and since the sheath layer at that end is effectively preserved, there is no missing part of the shield performance, Shield performance is improved. Then, a small amount corresponding to the width of the connecting member is sufficient for peeling off the insulating outer cover for providing the earth connecting portion, and the connecting member is wound and set on the earth connecting portion, and the winding setting posture is set. Since the effective ground circuit can be formed only by inserting and locking the ground terminal at the end of the ground wire into the terminal accommodating chamber of the connecting member, the formation process of the ground circuit can be particularly simplified.

Further, in the grounding structure of the present invention, a connection member having a conducting plate inside is wound around the ground connection portion of the shielded wire, and the ground terminal is inserted and locked in the terminal accommodating chamber of the connection member. Since the structure is featured, the earth circuit structure is mechanically robust, and the earth function is stable and high durability can be maintained even when used for electric wiring of an automobile that continuously receives an external force due to vehicle body vibration or the like.

[0009]

Embodiments will be described in detail below based on embodiments. First, referring to FIG. 1 showing a first embodiment of the present invention, an insulating outer sheath 4 of a sheath layer 3 is formed on an arbitrary intermediate portion of a shielded electric wire 1.
Is separated into a small width to provide a ground connecting portion 6 exposing the conductive layer 5, and the connecting member 10 described in detail below is attached to the ground connecting portion 6.

That is, as shown in FIG. 1B, the connecting member 10 is a combination of a resin connecting member main portion 11 and a tin plate-plated conductive plate 12 of which a connecting member is included. Reference numeral 11 has a shape in which half winding plates 7A and 7B each having a semicircular groove wound around the ground connection portion 6 are continuously provided via a hinge portion 8. The half winding plates 7A and 7B are rolled. When set, it has a shape of winding around the outer circumference of the ground connection portion 6, and further, in the connection member main portion 11, in the state where the half winding plates 7A and 7B are rolled, the terminal accommodating chamber located outside 9 is integrally provided (the terminal accommodating chamber 9 of this embodiment is integral with the half winding plate 7A), and has a terminal insertion direction parallel to the longitudinal direction of the shielded electric wire 1 of the grounded earth connection portion 6, and The conductive plate 12 is provided at the connection portion with the end of the half winding plate 7A. Conductive plate slits 13 are formed to enter.

On the other hand, the conductive plate 12 has a conductive layer contact portion 14 forming a semicircular groove and overlapping inside the half winding plate 7A, and a male terminal-shaped terminal contact portion 15 inserted into the terminal accommodating chamber 9.
Has a shape in which the slit insertion portion 16 is continuously provided,
The slit insertion portion 16 of the conductive plate 12 is inserted into the conductive plate slit 13 of the connecting member main portion 11 to form the conductive layer contact portion 14
Is superposed on the inside of the half winding plate 7A, and the terminal contact portion 15 is inserted into the terminal accommodating chamber 9 to be combined. It should be noted that the connecting member main portion 11 has a half winding plate 7
Locking claw 19 that locks the set posture by rolling A and 7B
A locking plate 18 and a locking portion 17 for receiving and locking the locking plate 18 are provided, and a locking piece 24 for locking the inserted ground terminal 23 is provided in the terminal accommodating chamber 9.

Then, the above-mentioned connecting member 10 is fitted and attached to the earth connecting portion 6, and the earth terminal 23 at the end of the earth wire 21 is inserted and locked in the terminal accommodating chamber 9 so that the earth circuit of the shielded electric wire 1 is formed. It is formed. Thus, see FIG. 1C,
The conductive layer contact portion 14 of the conductive plate 12 of the connecting member 10 attached to the ground connection portion 6 is brought into contact and conductive with the conductive layer 5 of the ground connection portion 6, and the conductive plate 1 inserted into the terminal accommodating chamber 9 is also provided.
The terminal contact portion 15 of No. 2 comes into contact with the ground terminal 23 for conduction.
An effective earth circuit is formed between the conductive layer 5 of the shielded electric wire 1 and the earth wire 21 via the conductive plate 12.
The above-mentioned embodiment has the above-mentioned effect.

Next, a connecting member 10 according to another embodiment of the present invention will be described with reference to FIG. That is, in the same combination of the connecting member main portion 11 and the conductive plate 12 as in the embodiment of FIG. 1, the one of this embodiment of FIG. 2 is replaced with the half winding plate 7B of the embodiment of FIG. Elastic winding band 25 is continuously provided on the half winding plate 7A having the terminal accommodating chamber 9, and the half winding plate 7A and the winding band 25 form a winding portion to the ground connection portion 6, The tip end portion of the winding band 25 wound around the ground connection portion 6 is inserted and locked in the band insertion locking hole 26 provided in the terminal accommodating chamber 9 to be inserted.

[0014]

As described above, in the ground structure for a shielded electric wire according to the present invention, the long sheath layer absent portion at the end of the shielded electric wire is eliminated and the shielding performance is improved. Then, the structure of the earth circuit is simplified, the formation process of the earth circuit and the earth connection work are simplified, the cost of the shielded wire is reduced, and the demand for mass production and high productivity of electric wiring for automobiles is satisfied. Further, it has a great effect that it has a strong structure and has high durability against vibration and the like, and the ground circuit performance is excellently stabilized for a long period of time.

[Brief description of drawings]

FIG. 1 shows a ground structure of a shielded electric wire according to a first embodiment of the present invention, in which (A) is an explanatory view of the structure and a processing procedure, and (B) is a perspective view of a connecting member thereof. , (C) in the figure is a front view of the mounted state of the connecting member.

FIG. 2 is a perspective view of a connecting member of a ground structure for a shielded wire according to another embodiment of the present invention.

FIG. 3 is an illustration of a conventional ground structure for a shielded wire.

[Explanation of symbols]

 1 Shielded Wire 2 Core Wire 3 Sheath Layer 4 Insulation Skin 5 Conductive Layer 6 Ground Connection Part 7A, 7B Half Winding Plate 8 Hinge Part 9 Terminal Storage Chamber 10 Connection Member 11 Connection Member Main Part 12 Conduction Plate 13 Conduction Plate Slit 14 Conductivity Layer contact part 15 Terminal contact part 17 Locking part 18 Locking plate 21 Ground wire 23 Ground terminal 25 Winding band 26 Band insertion locking hole

Claims (2)

[Claims] 1. A terminal accommodating device is provided in a ground connection portion, in which a conductive layer of the sheath layer is exposed, and a winding portion around the ground connection portion, by peeling an insulating outer cover of a sheath layer in an intermediate portion of the shielded wire to an arbitrary width. The connection member main portion having a continuous chamber and a connection member that is overlapped with the inside of the winding portion and includes a conductive plate having a terminal contact portion extending into the terminal accommodation chamber are mounted, and the terminal accommodation chamber is attached. A ground structure for a shielded wire, comprising a structure in which a ground terminal at a ground wire end is inserted and locked, and the ground connection portion and the ground wire are connected and conducted via the conductive plate. 2. The ground structure for a shielded electric wire according to claim 1, wherein the main part of the connecting member has a winding portion formed of a half winding plate that can be opened and closed via a hinge portion.