JP2004072943A - Water cut-off structure for earth wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cut off water penetrating from a core wire exposed to a connecting part by connecting an earth terminal to a wire end. <P>SOLUTION: The core wire exposed from the earth wire end and formed by twisting a large number of element wires is caulked and pressed to the earth terminal, to which a core-wire pressing barrel and an insulating coating pressing barrel are protruded from an electrical connecting part having a bolt-mounting hole and a base board that is continued to the connecting part. The insulating coating of the wire is caulked and pressed to the earth terminal by the insulating coating pressing barrel. The insulating coating of the earth wire in the vicinity of an earth terminal pressing part is peeled off at its middle part and the core wire is exposed, a large number of the element wires of the exposed core wire are welded, and water penetrating inside the wire from a press-connected part with the earth terminal is cut off, thus shrinking the exposed core wire including the welded part by winding it with a tape applied with silicone or covering it with a thermal shrinking tube. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water blocking structure for a grounding electric wire, and more specifically, to cut off water permeating into a wire from a connection portion with a ground terminal.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a ground terminal 1 for an automobile is usually formed in a shape shown in FIG. 6, and a circular electric contact portion 4 having a bolt mounting hole 3 and a flat substrate portion continuous with the electric contact portion 4. A core wire crimping barrel 6 and an insulation coating crimping barrel 7 protrude from both sides in the width direction of the substrate portion 5 from the electrical contact portion side. The core wire w-1 exposed from the terminal of the electric wire w is crimped to the ground terminal 1 with the core wire crimping barrel 6, and the insulation coating w-2 of the wire is changed to the insulation coating crimping barrel 7 with the wire. It is crimped.
[0003]
[Problems to be solved by the invention]
When the earth terminal 1 is connected to the body or the engine case by bolting in the engine room of the automobile by bolts, since the engine room is a wet area, the core wire to be crimped to the earth terminal 1 is exposed. When water is applied to the portion, water easily penetrates into the inside of the electric wire through a gap between a number of twisted strands constituting the core wire. As described above, when water penetrates into the core wire w-1, water penetrates into the electric wire from the core wire caulking portion due to a capillary action or a pressure difference, and water is generated in the electronic device 8 connected to the electric wire, thereby having an adverse effect. Have a problem.
[0004]
The present invention has been made in view of the above-described problem, and prevents water that has penetrated from a ground terminal from stopping in the middle of an electric wire, thereby preventing inconvenience caused by inundation in an electronic device connected to the electric wire. The challenge is to do that.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides an electric contact portion having a bolt mounting hole, and a ground terminal in which a core wire crimping barrel and an insulation coating crimping barrel are projected from a substrate portion continuous with the electric contact portion, A core wire obtained by twisting a large number of strands exposed from the ground wire terminal is crimped and crimped by the core wire crimping barrel, and the insulating coating of the wire is crimped and crimped by the insulating coating crimping barrel,
The insulating coating of the grounding wire at a position close to the ground terminal crimping portion is peeled off in the middle to expose the core wire, and a large number of strands of the exposed core wire are welded to each other to form a ground terminal. Winding with a silicon-coated tape or covering with a heat-shrinkable tube to shrink the water that infiltrates the inside of the wire from the crimp connection portion, and completely covers the exposed core wire including the welded portion, and shrinks it. It provides a waterproof structure for grounding wires.
[0006]
With the above structure, in the part where the electric wire connected to the ground terminal is peeled in the middle and welded, the gap between the element wires constituting the core wire is integrated and the gap is completely eliminated, and Can be interrupted at the above welded portion even if it has permeated. Therefore, it is possible to prevent water from penetrating into the device connected to the ground wire, and to prevent the electronic device from being adversely affected.
[0007]
In addition, by covering the welded portion with a tape made of insulating resin coated with silicon, it is possible to prevent water from being generated from the welded portion.
Similarly, by covering the welded portion with a heat-shrinkable tube made of an insulating resin, shrinking the heat-shrinkable tube by heating and closely covering the welded portion, it is possible to prevent water from being generated from the welded portion.
[0008]
A core wire is exposed from a terminal of another grounding wire different from the grounding wire in which the grounding terminal is crimped to one end, and the core exposed from the terminal is peeled off and exposed to the intermediate wire of the grounding wire. The overlapped portion may be welded, and the exposed core wire portion may be covered with the silicone coated tape or the heat-shrinkable tube.
With the above structure, a plurality of grounding wires can be jointed to establish a ground connection with one ground terminal, and at the same time, the watering of each grounding wire can be achieved.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 to 3 show a first embodiment of the present invention, and the shape of a ground terminal 10 is the same as that of the conventional example of FIG. That is, a round electric contact portion 12 having a bolt mounting hole 11 and a flat plate-shaped substrate portion 13 continuous with the electric contact portion 12 are provided. 14 and an insulation-coated crimping barrel 15 protrude from both sides in the width direction.
[0010]
As shown in FIG. 2A, the core wire w-1 exposed from the terminal of the electric wire w is crimped and crimped to the ground terminal 10 with the core wire crimping barrel 14, and the insulating coating w-2 of the electric wire w is formed. Are caulked and crimped by the insulating coating crimping barrel 15.
The core wire w-1 is not a single core wire but a stranded wire formed by twisting a number of strands a, b, c.
[0011]
As shown in FIG. 2 (B), the insulation coating w-2 is peeled off at the position close to the ground terminal connection part, and the core w- 1 is exposed. Next, as shown in FIG. 2 (C), the exposed core wire w-1 is welded and the twisted strands are integrally formed to form a welded portion w-3.
Thereafter, as shown in FIG. 2D, a wide tape 20 made of an insulating resin coated with silicon 21 is wound around the core wire w-1 and the welded portion w-3 exposed by peeling. The tape 20 is provided with an adhesive layer 22 on the inner surface side on which the silicon 21 is applied, and is fixed by being wound around the welded portion w-3.
Further, the tape 20 is extended and wound up to the outer peripheral surface of the insulating coating w-2 on both sides of the peeled portion where the core wire is exposed, and the tape 20 is flooded from the boundary between the exposed core wire w-1 and the insulating coating and w-2. To prevent it from occurring.
According to the above-described procedure, as shown in FIG. 3, the silicon 21 is filled between the weld w-3 and the strands of the core wires before and after the weld, and is completely covered with the tape 20.
[0012]
With the above configuration, water that has penetrated through the gap between the strands of the core wire w-1 into the inside of the electric wire w that has penetrated from the crimping portion of the ground terminal 10 passes through the welding portion w-3 and the welding portion w-3. Water is stopped by the covering silicon 21. As described above, since water is blocked at the welded portion w-3, it is possible to prevent water from penetrating into the device connected to the electric wire w, and there is no adverse effect on the device.
[0013]
FIG. 4 shows a second embodiment of the present invention. The difference from the first embodiment is that a heat-shrinkable tube 30 made of an insulating resin is used instead of winding a tape coated with silicon around a weld w-3. It is shrunk by heating at a required temperature (about 200 ° C.) and closely adhered to the weld w-3.
The other configuration is the same as that of the first embodiment, and the description is omitted.
[0014]
With the above configuration, similarly to the first embodiment, the water permeated from the caulked portion of the ground terminal 10 is stopped by the welded portion w-3 and the heat-shrinkable tube 30 covering the welded portion w-3, and the electric wire w Water can be prevented from permeating into the electronic device connected to the electronic device, and the electronic device is not adversely affected.
[0015]
FIG. 5 shows a third embodiment of the present invention, in which another grounding wire w ′, w ″ to be connected to another device or the like is connected to a grounding wire w which is crimp-connected to the ground terminal 10 to form a joint. And three grounding wires w, w ′, w ″ are connected without passing through the joint connector of the grounding terminal 10.
The other ground wires w 'and w "are exposed at their ends to expose the core wires w'-1 and w" -1 and are superimposed on the core wire w-1 of the ground wire w which has been peeled off in the middle, and these core wires are integrated. Welded. Thereafter, a tape 20 coated with silicon 21 is wound around the welded portion w-3 ′ to cover the welded portion and the entire exposed core wire.
With the above configuration, it is possible to joint the three grounding wires, and at the same time, to stop water at the core wires of the respective wires.
[0016]
【The invention's effect】
As is apparent from the above description, according to the present invention, the gap between the core wires is eliminated by welding at a required portion of the electric wire connected to the ground terminal, and the water permeated from the crimping portion of the ground terminal is stopped at the weld portion. Therefore, water can be prevented from penetrating into the electronic device connected to the electric wire rather than the welded portion, and adverse effects on the electronic device can be prevented.
[0017]
Further, by covering the welded portion with a tape or a heat-shrinkable tube coated with silicon, it is possible to reliably stop the water that intrudes from the crimping portion of the ground terminal.
Furthermore, in the water blocking structure of the present invention, a general-purpose ground terminal that has been used conventionally can be used.
[Brief description of the drawings]
FIG. 1A is a perspective view showing a ground terminal having a water blocking structure according to a first embodiment of the present invention.
2 (A) to 2 (D) are views showing steps of forming a water-stop structure of the present invention.
FIG. 3 is a sectional view taken along line II of FIG. 2 (D).
FIG. 4A is a perspective view illustrating a ground terminal having a water blocking structure according to a second embodiment of the present invention, and FIG. 4B is a perspective view illustrating a heat-shrinkable tube.
FIG. 5 is a schematic view showing a third embodiment.
6A is a drawing showing a conventional ground terminal, and FIG. 6B is a drawing showing a conventional problem.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Ground terminal 11 Bolt mounting hole 12 Electric contact part 13 Flat plate part 14 Barrel for core wire crimping 15 Barrel for insulation coating crimping 20 Tape 21 Silicone 30 Heat shrinkable tube w Electric wire w-1 Core wire w-2 Insulation coating w-3 Welded part a , B, c strand

Claims (2)

An electrical contact portion having a bolt mounting hole, and a ground terminal having a core wire crimping barrel and an insulation coating crimping barrel protruding from a substrate portion continuous with the electrical contact portion, a large number of elements exposed from a ground wire terminal. The core wire obtained by twisting the wire is crimped and crimped with the barrel for crimping the core wire, and the insulating coating of the wire is crimped and crimped with the barrel for crimping the insulating coating.
The insulating coating of the grounding wire at a position close to the ground terminal crimping portion is peeled off in the middle to expose the core wire, and a large number of strands of the exposed core wire are welded to each other to form a ground terminal. Winding with a silicon-coated tape or covering with a heat-shrinkable tube to shrink the water that infiltrates the inside of the wire from the crimp connection portion, and completely covers the exposed core wire including the welded portion, and shrinks it. Waterproof structure for grounding wires. A core wire is exposed from a terminal of another grounding wire different from the grounding wire in which the grounding terminal is crimp-connected to one end, and a core exposed from the terminal is peeled off and exposed from the terminal of the grounding wire. The water stopping structure for an earthing wire according to claim 1, wherein the core wire exposed portion is overlapped and welded, and the exposed portion of the core wire welded by the silicone coated tape or the heat shrinkable tube is covered.

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