JPH0778663A - Shield cable grounding method and associate connection piece - Google Patents

Abstract

PURPOSE:To enhance the shielding performance by simplifying the formation process for a grounding circuit to a car body of a shield cable to be accommodated in a molded protector for wire harness, and eliminating any part where sheath layer for the grounding circuit does not exist. CONSTITUTION:An exposed conductive layer 5A is provided on a shield cable 1 by exfoliating the insulative outer skin 4 of its sheath layer 3 in the intermediate portion of the shield cable 1, and by the use of a connection piece for grounding 6 having a contacting part 7 for the layer 5A and a connection part 8 for a car body 14, the connection part 8 is overlapped on the outside of a bottom plate 15 of a molded protector 10 for wire harness, and at the same time, the contacting part 7 is mounted while protruding to the inside of the molded protector 10. The exposed conductive layer 5A of the shield cable 1 is inserted in this contacting part 7 to generate connection, and then the protector 10 is fixed to the car body 14, and thereby the connection part 8 is pinched by the bottom plate 15 and car body 14 so that surface contact electric continuity to the car body 14 is generated.

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. It relates to the grounding method for shielded wires that prevent the leakage of electromagnetic waves from the core wire to the outside. Specifically, the wire harness wire group is stored and the wire harness is arranged in the body / device. The present invention relates to a grounding method for a seed wire housed in a wire harness molded protector to be held and a grounding connector used for the grounding method.

[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 by 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 an earth circuit, or a shield wire 1 is provided with a drain wire (not shown) made of a conductive mesh parallel to the core wire 2 in the end of the shield wire 1. 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 shrinkable tube or tape winding.

[0003]

The above-mentioned conventional method of forming an earth circuit is performed by peeling off the end portion of the shielded electric wire 1.
The process of twisting and gathering the conductive layer 5 to form the drain wire 20 in a single wire state, and the insulation treatment of fitting a heat-shrinkable tube to the drain wire 20 make the work extremely complicated, resulting in poor workability and inefficient work. In addition, there is a drawback that goes against the high productivity of electric wire mass production in recent years.

Further, when the conductive layer 5 is twisted and collected to be processed into the drain wire 20 in a single wire state, it is necessary to peel off the sheath layer 3 having a considerable length (usually about 200 grits). When crimping the connector 22 to the drain wire,
Since the drain wire length necessary to fix and hold the drain wire lacking in rigidity is required, the end separation of the shielded electric wire 1 has to be made considerably 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. The present invention provides a grounding method for a shielded electric wire which solves the above-mentioned problems of the prior art.

[0005]

The method of grounding a shielded electric wire according to the present invention for solving the above technical problems is described as follows: "A shielded electric wire housed in a groove wire molded protector for a wire harness is
When grounding to the vehicle body / device, the insulating outer skin of the sheath layer in the middle portion of the shielded wire is peeled off to expose the conductive layer of the sheath layer, and then the contact portion to the exposed conductive layer and the vehicle body / device Using a grounding connector having a connecting portion to, while connecting the contact portion to the exposed conductive layer of the shielded electric wire in the wire harness molded protector, the connection portion of the wire harness molded protector. By exposing to the outside and superimposing on the bottom outside of the wire harness molding protector, by fixing the wire harness molding protector to the vehicle body / device,
The method is characterized in that the connecting portion is sandwiched between the bottom portion and the vehicle body / device to form an earth circuit for connecting and conducting the sheath layer and the vehicle body / device via the earthing connector ".

In the earthing connector used in the above-mentioned earthing method, a single plate member is bent to form a central portion into a flat plate-like connecting portion which is in surface contact with the outside of the bottom of the wire harness molding protector. Both ends of the connection part are bent to form a contact part composed of a pair of opposed clamping pieces, and the contact part is inserted from the connector insertion hole of the wire harness molding protector to be mounted on the wire harness molding protector. Things are mainly used.

[0007]

The above-described grounding method of the shielded wire of the present invention is
Between the exposed conductive layer in the middle of the shielded wire housed in the wire harness molded protector and the bottom of the wire harness molded protector, the ground connector is used, and when the wire harness molded protector is fixed to the vehicle body,
The connecting portion of the connector is sandwiched between the bottom portion and the vehicle body to make electrical contact, so that the sheath layer of the shielded wire and the vehicle body
An effective ground circuit can be formed between devices.

Then, the complicated work of forming the ground circuit by peeling the end portion of the shielded wire in the conventional method for a long time is made unnecessary, and the sheath layer at the end portion is effectively preserved. The shield performance is improved. Furthermore, a small amount corresponding to the width of the grounding connector is sufficient for peeling off the insulating jacket for mounting the grounding connector, and the grounding connector is brought into contact with the peeled portion, and the shielded wire is attached. Since the simple work of mounting the housed molded protector on the vehicle body or the like is sufficient, the ground circuit forming process of the shielded wire can be particularly simplified as compared with the above-mentioned conventional method.

[0009]

Embodiments will be described in detail below based on embodiments. First, referring to FIG. 1 showing a first embodiment of the present invention, a grounding connector 6 used in the grounding method of this embodiment is shown in FIG. And has a shape of a flat plate-like connecting portion 8 in the central portion and a contact portion 7 in which both ends of the connecting portion 8 are bent to form a pair of opposing sandwiching pieces 16, and above the contact portion 7. Therefore, the shielded electric wire 1 described later
When the exposed conductive layer 5A is pushed in, the exposed conductive layer 5A
The pair of clasping pieces 16 are elastically pressed so that the exposed conductive layer 5A and the contact portion 7 are electrically connected. Then, using this grounding connector 6, a grounding circuit is formed by the following procedure.

That is, referring to FIG. 1 (A), a pair of grounding connectors 6 are attached to a bottom plate 15 of a U-shaped grooved wire harness molded protector 10 (hereinafter, simply referred to as molded protector 10). A connector insertion hole 12 through which the piece 16 is inserted is provided, and a fitting piece 16 is passed through the connector insertion hole 12 from the outside of the bottom plate 15 to superpose the connection portion 8 on the outer periphery of the bottom plate 15 and also to contact the contact portion 7. And the grounding connector 6 are attached to the molding protector 10. Then, the insulating sheath 4 of the sheath layer 3 at a predetermined intermediate position of the shielded electric wire 1 housed in the molded protector 10
Is removed to expose the entire circumference of the conductive layer 5 below the insulating outer cover 4, and the exposed conductive layer 5A having a cylindrical shape is inserted into the protruding contact portion 7 to form the shielded wire 1 into the protector 10 To store. Then, the molded protector 10 is attached to the vehicle body 14
By attaching and fixing the connecting portion 8 of the grounding connector 6 between the bottom plate 15 and the vehicle body 14, the connecting portion 8 and the vehicle body 14 are brought into surface contact with each other to be electrically connected to each other. The sheath layer 3 and the vehicle body 14 are connected and conducted via the connector 6 for forming a ground circuit of the shielded electric wire 1.

Next, a grounding connector 6 according to another embodiment of the present invention will be described with reference to FIG. That is, (A) of FIG.
The one is made by bending a single strip plate material into a U shape,
The parallel contact portion 7 and the connecting portion 8 are integrated through the connecting portion 17, and the U-shaped grounding connector 6 is provided.
The contact part 7 of the molding protector 10 is protruded to the inside of the molding protector 10 from the connector insertion hole 12 of the groove side plate of the molding protector 10, and the connection part 8 is mounted on the outside of the bottom plate 15 by superposition and attachment. Is brought into pressure contact with the exposed conductive layer 5A of the shielded wire 1 to bring them into contact with each other, and the molded protector 10 is attached to the vehicle body
4 is fixed to the bottom plate 15 by connecting the connection part 8 to the bottom plate 15.
And the vehicle body 14 are sandwiched and fixed, and the connecting portion 8 is brought into surface contact conduction with the vehicle body 14.

2B shows a U-shaped grounding connector 6 in which a pair of contact portions 7 are erected in parallel at both ends of a plate-shaped connecting portion 8, and the connecting portion 8 is also provided. The contact portion 7 protruding inside the molding protector 10 is bent while being polymerized on the outer side of the bottom plate 15, and is pressure-bonded and connected to the exposed conductive layer 5A. 2C, the conductive tape 18 is used as the grounding connector 6, and the conductive tape 18 having one end wound around the exposed conductive layer 5A in the molding protector 10 is attached to the outer periphery of the molding protector 10. The conductive tape 18 wound on the outer side of the bottom plate 15 is wound around the bottom plate 15 by setting the winding protector posture on the molding protector 10 by fixing the molding protector 10 to the vehicle body 14 while setting the winding mounting posture on the molding protector 10. The grounding circuit of the shielded electric wire 1 similar to that of the above-described embodiment is formed by bringing the vehicle body 14 into surface contact with it for conduction. In the case of FIG. 2A, a guide protrusion 23 for stabilizing the position of the shielded electric wire 1 may be provided inside the molding protector 10.

Each of the above-mentioned embodiments has the above-mentioned action, and the earthing connector 6 is attached between the exposed conductive layer 5A in the middle of the shielded wire 1 and the bottom of the molded protector 10,
Since the ground circuit can be formed only by attaching the molded protector 10 to the vehicle body 14, the forming process of the ground circuit is extremely simplified, and the conventional long ground wire is not required.
The complicated processing of the end of the shielded wire and the portion where the sheath layer does not exist are eliminated.

[0014]

As described above, the method for grounding a shielded electric wire of the present invention and the grounding connector used for the method are as follows.
The long sheath layer absent portion at the end of the shielded wire is eliminated to improve the shield performance, and the grounding circuit is simplified to simplify the processing and promote the cost reduction of the shielded wire, and the mass production of wire harness. There are various effects that satisfy the demand for high productivity.

[Brief description of drawings]

FIG. 1 shows a method for grounding a shielded electric wire according to a first embodiment of the present invention and a grounding connector used therefor, which is shown in FIG.
Is a perspective view showing the procedure and method of the grounding method, (B) in the figure is a perspective view of the grounding connector, and (C) in the figure.
Is a cross-sectional view of the molded protector for the wire harness showing the state of the ground circuit.

FIG. 2 shows a ground connector according to another embodiment of the present invention,
Illustration of (A) (B) (C) in the figure and its shape and usage

FIG. 3 is a perspective view showing a conventional method for forming a ground circuit of a shielded electric wire.

[Explanation of symbols]

 1 Shielded Wire 2 Core Wire 3 Sheath Layer 4 Insulation Skin 5 Conductive Layer 5A Exposed Conductive Layer 6 Grounding Connector 7 Contact Part 8 Connection Part 10 Wire Harness Molding Protector 12 Connector Insertion Hole 13 Mounting Bolt 14 Body 15 Bottom Plate 16 Insert Wearing piece 17 Connecting part 18 Conductive tape

Claims (2)

[Claims] 1. When the shielded wire housed in the grooved wire harness molded protector is grounded to a vehicle body / device, the insulating outer skin of the sheath layer in the middle portion of the shielded wire is peeled off to make the sheath layer conductive. Exposing the layer, and then using a grounding connector having a contact part to the exposed conductive layer and a connection part to the vehicle body / device, to the exposed conductive layer of the shielded wire in the molded protector for the wire harness. While connecting the contact portion, the connection portion is exposed to the outside of the wire harness molding protector and polymerized on the bottom outside of the wire harness molding protector,
By fixing the molded protector for the wire harness to the vehicle body / device, the connecting portion is sandwiched between the bottom portion and the vehicle body / device, and the sheath layer and the vehicle body / device are connected via the grounding connector. A grounding method for a shielded electric wire, which is characterized in that a grounding circuit for connecting and conducting is used. 2. An intermediate portion formed by bending a single plate member is formed into a flat plate-like connecting portion which is in surface contact with the outside of the bottom portion of the wire harness forming protector, and both ends of the connecting portion are opposed to each other by a pair of sandwiching pieces. A grounding connector used in the method for grounding a shielded electric wire according to claim 1, wherein the contacting part is composed of