JP6901946B2 - Water-stop connection structure for electric wires and water-stop connection method for electric wires - Google Patents

Description

The present invention relates to a water-stopping connection structure for electric wires that stop water from exposed conductor portions to which a plurality of electric wires are connected to each other, and a water-stopping connection method for electric wires.

Conventionally, when each electric wire of a wire harness distributed to an automobile is electrically connected to each other, as shown in FIG. 6, the conductor portion 11 is formed by removing the insulating coating 13 of the terminal portion of the plurality of electric wires 10. The exposed conductor exposed portions 12 are connected to each other by thermocompression bonding or the like.
When such a wire harness is mounted on a vehicle, the exposed conductor portion including the connecting portion of a plurality of electric wires is waterproofed.

For example, in Patent Document 1, the exposed conductor portions of the terminal portions of a plurality of electric wires are connected to each other, and the terminal portion of the electric wire including the connecting portion is housed in a tank to which ultrasonic vibration is applied. A water-stopping connection method for an electric wire is described in which the water-stopping agent is allowed to permeate the exposed portion of the conductor of the electric wire by immersing it in an agent.

JP-A-2007-141620

However, in the method of water-stopping connection of electric wires described in Patent Document 1, as shown in FIG. 7, the water-stopping agent W tends to remain on the end surface 13b of the insulating coating 13 of each electric wire 10, and further, the insulating coating 13 When a gap S is generated between the metal wire and the plurality of metal wires 11a bundled as the conductor portion 11, the water blocking agent W flows into the gap S, so that the water blocking agent W flows into the plurality of metal wires 11a. There is a problem that it is difficult for the water to penetrate, and as a result, the water stopping performance is deteriorated.

The present invention has been made in view of the above, and is a water-stopping connection structure for an electric wire, which can improve the water-stopping performance by increasing the amount of the water-stopping agent permeating into a plurality of metal strands of the electric wire. , And, it is an object of the present invention to provide a waterproof connection method of an electric wire.

In order to solve the above-mentioned problems and achieve the object, the water-stop connection structure of the electric wire according to claim 1 of the present invention has a plurality of conductor portions in which a plurality of metal strands are bundled surrounded by an insulating coating. A through hole or a through hole is formed inside the end face of the insulation coating at the coated end portion of the insulation coating to which the water blocking agent is applied, including the exposed conductor portion of the terminal portion where the electric wires are connected to each other from which the insulation coating has been removed. It is characterized in that a slit cut from the end face of the insulating coating is formed.

Further, in the water-stop connection structure of the electric wire according to claim 2 of the present invention, in the above invention, the through hole or the slit is a plurality of the through holes, or the slit is the circumferential direction of the insulating coating. It is characterized in that it is evenly distributed along the above.

In order to solve the above-mentioned problems and achieve the object, the water-stopping connection method of the electric wire according to claim 3 of the present invention is for an electric wire in which a conductor portion in which a plurality of metal strands are bundled is surrounded by an insulating coating. A through hole is formed inside the end face of the insulation coating at the coating end portion of the insulation coating on the side of the exposed conductor portion from which the insulation coating is removed, or a slit is formed by cutting a slit from the end face of the insulation coating. After the water blocking agent penetrating portion forming step and the water blocking agent penetrating portion forming step, the water blocking agent coating step of applying the water blocking agent to the end of the electric wire including the conductor exposed portion and the coated end portion. , Is included.

In the water-stopping connection structure of the electric wire according to the present invention, the covering end portion of the insulating coating to which the water-stopping agent is applied including the exposed conductor portion from which the insulating coating is removed, in which the plurality of the electric wires are connected to each other, is formed. A through hole or a slit cut from the end face of the insulation coating is formed inside the end face of the insulation coating.
Therefore, in the water-stopping connection structure of the electric wire according to the present invention, the water-stopping agent can be permeated into the plurality of metal strands inside the coated end portion through the through hole or the slit. Therefore, the water blocking performance can be improved by increasing the permeation amount of the water blocking agent into the plurality of metal strands of the electric wire.

In the water-stopping connection method for electric wires according to the present invention, a water-stopping agent is applied to the exposed conductor portion from which the insulating coating is removed, in which a plurality of the electric wires are connected to each other by the water-stopping agent penetrating portion forming step. A through hole or a slit cut from the end face of the insulation coating is formed in the coated end portion of the insulation coating inside the end face of the insulation coating.
Further, in the method for connecting the water-stopping agent of the electric wire according to the present invention, the water-stopping agent is applied after the step of forming the water-stopping agent penetrating portion and before the step of connecting the exposed conductor portions of the plurality of the electric wires to each other. A water blocking agent is applied to the end of the electric wire including the exposed conductor portion and the coated end portion by the process.
Therefore, the water-stopping connection method for the electric wire according to the present invention can allow the water-stopping agent to permeate the plurality of metal wires inside the coated end portion through the through hole or the slit, resulting in the result. Therefore, the water blocking performance can be improved by increasing the permeation amount of the water blocking agent into the plurality of metal strands of the electric wire.

1A is an enlarged view of the water-stop connection structure of the electric wire according to the first embodiment of the present invention, and FIG. 1B is an enlarged view of the periphery of the covered end portion of the electric wire shown in (a). is there. 2A and 2B are diagrams for explaining a step of forming a water blocking agent penetrating portion, and FIG. 2B is a diagram for explaining a step of connecting exposed conductor portions of a plurality of electric wires to each other. c) is a diagram for explaining the water blocking agent application process, and (d) is a diagram for explaining the process of attaching the heat shrink cap. FIG. 3 is a diagram in which (a) shows a water-stop connection structure of an electric wire according to a second embodiment of the present invention, and FIG. 3 (b) is an enlarged view of the periphery of a covered end portion of the electric wire shown in (a). is there. FIG. 4 is a diagram in which (a) shows a water-stop connection structure of the electric wire according to the third embodiment of the present invention, and FIG. 4 (b) is an enlarged view of the periphery of the covered end portion of the electric wire shown in (a). is there. 5A is an enlarged view of the water-stop connection structure of the electric wire according to the fourth embodiment of the present invention, and FIG. 5B is an enlarged view of the periphery of the covered end portion of the electric wire shown in FIG. 5A. is there. FIG. 6 is a diagram for explaining a water-stop connection structure of a conventional electric wire. FIG. 7 is a diagram for explaining problems of the water-stop connection structure of the electric wire and the water-stop connection method of the electric wire of the prior art.

Hereinafter, preferred embodiments of the water-stop connection structure for electric wires and the water-stop connection method for electric wires according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram in which (a) shows a water-stop connection structure 1 of an electric wire according to a first embodiment of the present invention, and FIG. 1 (b) is an enlargement of the periphery of the covered end portion 13a of the electric wire 10 shown in (a). It is a figure that was made.
The water-stop connection structure 1 for electric wires according to the first embodiment of the present invention, for example, electrically connects a plurality of electric wires 10 of a wire harness distributed in an automobile to each other.

The water-stopping connection structure 1 of the electric wire is such that the splice portion 20 in which the plurality of electric wires 10 are electrically connected by thermocompression bonding the conductor exposed portion 12 of the terminal portion can be water-stopped.
In addition, in this Example 1, in the water-stopping connection structure 1 of an electric wire, a plurality of electric wires 10 connected to each other by a splice portion 20 are an insulating coating 13 around a conductor exposed portion 12 including a splice portion 20 and a conductor exposed portion 12. A heat-shrinkable cap 30 made of an insulating material (see FIG. 1A) is attached so as to cover the area surrounded by the conductor portion 11.

In the water-stopping connection structure 1 of an electric wire, a conductor portion 11 in which a plurality of metal strands 11a are bundled is surrounded by an insulating coating 13, and a conductor in which the insulating coating 13 of a terminal portion in which a plurality of electric wires 10 are connected to each other is removed. A plurality of through holes 14 arranged inside the end surface 13b of the insulating coating 13 are formed in the covering end portion 13a of the insulating coating 13 to which the waterproofing agent W is applied, including the exposed portion 12.

As the water blocking agent W, for example, silicone resin, silicone rubber, grease, butyl rubber, epoxy resin, acrylic resin, thermoplastic resin, and other adhesives having viscosity and elasticity are used.

Each through hole 14 has an elliptical shape with the extending direction of the electric wire 10 as the longitudinal direction.
The plurality of through holes 14 are evenly distributed along the circumferential direction of the insulating coating 13.
Although the through hole 14 has an elliptical shape in the first embodiment, the shape of the through hole 14 is not limited to the elliptical shape, and other shapes such as a perfect circular shape or a hexagonal shape are used. It may be.

Next, a water-stop connection method for the electric wire according to the first embodiment of the present invention will be described with reference to FIG.
2A and 2B are diagrams for explaining a step of forming a water blocking agent penetrating portion, and FIG. 2B is a diagram for explaining a step of connecting exposed conductor portions 12 of a plurality of electric wires 10 to each other. , (C) is a diagram for explaining the water blocking agent application process, and (d) is a diagram for explaining the process of attaching the heat shrink cap 30.

First, as a step of forming the water blocking agent penetrating portion, the operator cuts the electric wire 10 unwound from a drum (not shown) to a predetermined length, removes the insulating coating 13 of the terminal portion of the electric wire 10, and conducts the conductor. At the same time that the exposed conductor portion 12 is formed, a plurality of through holes 14 are formed in the coated end portion 13a of the insulating coating 13 on the exposed conductor portion 12 side (see FIG. 2A).
In the water blocking agent penetrating portion forming step, after the conductor exposed portion 12 of the electric wire 10 is formed, a plurality of through holes 14 may be formed in the coated end portion 13a of the insulating coating 13 on the conductor exposed portion 12 side. Good.

Next, the operator connects the exposed conductor portions 12 of the plurality of electric wires 10 to each other (see FIG. 2B).
Here, the operator forms the splice portion 20 by thermocompression-bonding the conductor exposed portions 12 of the plurality of electric wires 10 and connecting them to each other.
The splice portion 20 may be formed by other methods such as welding and soldering, in addition to the method by thermocompression bonding.

Next, as a water blocking agent application step, the operator stops water in the exposed conductor portion 12 that has been thermocompression bonded and the end 13a region of the insulating coating 13 around the exposed conductor 12 that has been thermocompression bonded. Agent W is applied (see FIG. 2 (c)).
More specifically, the operator immerses the end portion of the electric wire 10 including the conductor exposed portion 12 and the coated end portion 13a on the conductor exposed portion 12 side in the water blocking agent W housed in the tank B.
By this water blocking agent coating step, the water blocking agent W is infiltrated into the conductor exposed portion 12 of each electric wire 10.
Further, the water blocking agent W penetrates into the conductor portion 11 in the coating end portion 13a through the plurality of through holes 14.
Therefore, the water blocking agent W also permeates into the bundled metal strands 11a even at the covered end portion 13a of the electric wire 10.

Finally, the operator encloses the conductor portion 11 with the conductor exposed portion 12 including the splice portion 20 and the insulating coating 13 around the conductor exposed portion 12 with respect to the plurality of electric wires 10 connected to each other by the splice portion 20. A heat-shrinkable cap 30 is attached so as to cover the area (see FIG. 2D).

In the water-stopping connection method of the electric wire described in the first embodiment, after the conductor exposed portions 12 of the plurality of electric wires 10 are connected to each other, the conductor exposed portion 12 including the splice portion 20 and the insulating coating 13 around the conductor exposed portion 12 are formed. An example of performing a water blocking agent coating step of applying the water blocking agent W to the end portion 13a region of the electric wire is not limited to this, but the conductor exposed portions 12 of the plurality of electric wires 10 are attached to each other after the water blocking agent coating step. You may try to connect.

The water-stopping connection structure 1 of the electric wire according to the first embodiment of the present invention has an insulating coating to which the water-stopping agent W is applied, including the exposed conductor portion 12 from which the insulating coating 13 connecting the plurality of electric wires 10 to each other has been removed. A through hole 14 is formed in the coated end portion 13a of the insulating coating 13 inside the end surface 13b of the insulating coating 13.
Therefore, the water blocking connection structure 1 of the electric wire according to the first embodiment of the present invention can penetrate the water blocking agent W into the plurality of metal strands 11a inside the coated end portion 13a through the through hole 14, resulting in the result. Therefore, the water stopping performance can be improved by increasing the permeation amount of the water blocking agent W into the plurality of metal strands 11a of the electric wire 10.

Further, in the water-stop connection structure 1 of the electric wire according to the first embodiment of the present invention, since the plurality of through holes 14 are evenly distributed along the circumferential direction of the insulating coating 13, the through holes 14 are covered. The water blocking agent W can be evenly permeated along the circumferential direction into the plurality of metal strands 11a inside the end portion 13a.

In the method of water-stopping connection of electric wires according to the first embodiment of the present invention, the water-stopping agent includes the exposed conductor portion 12 from which the insulating coating 13 to which the plurality of electric wires 10 are connected to each other is removed by the water-stopping agent penetrating portion forming step. A through hole 14 is formed inside the end surface 13b of the insulating coating 13 at the covering end portion 13a of the insulating coating 13 to which W is applied.
Further, in the water-stopping connection method of the electric wire according to the first embodiment of the present invention, after the water-stopping agent penetrating portion forming step, the end portion of the electric wire 10 including the conductor exposed portion 12 and the coated end portion 13a is subjected to the water-stopping agent application step. The water blocking agent W is applied to the water.
Therefore, the water-stopping connection method for the electric wire according to the first embodiment of the present invention can allow the water-stopping agent W to permeate into a plurality of metal strands 11a inside the coated end portion 13a through the through hole 14, resulting in In addition, the water blocking performance can be improved by increasing the permeation amount of the water blocking agent W into the plurality of metal strands 11a of the electric wire 10.

Next, the water-stop connection structure 2 of the electric wire and the water-stop connection method of the electric wire according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a diagram in which (a) shows the water-stop connection structure 2 of the electric wire according to the second embodiment of the present invention, and FIG. 3 (b) is an enlargement of the periphery of the covered end portion 13a of the electric wire 10 shown in (a). It is a figure that was made.

The water-stop connection structure 2 of the electric wire and the water-stop connection method of the electric wire according to the second embodiment of the present invention include the shapes of the plurality of through holes 15 formed in the coated end portion 13a of the electric wire 10 and the plurality of through holes 15. It is different from the water-stop connection structure 1 of the electric wire and the water-stop connection method of the electric wire of the first embodiment in that the arrangement configuration of the electric wire is different.
The other configurations are the same as those in the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the water-stopping connection structure 2 of the electric wire, the conductor portion 11 in which the plurality of metal strands 11a are bundled is surrounded by the insulating coating 13, and the insulating coating 13 of the terminal portion to which the plurality of electric wires 10 are connected to each other is removed. A plurality of through holes 15 are formed inside the end face of the insulating coating 13 at the covering end portion 13a of the insulating coating 13 to which the waterproofing agent W is applied, including the exposed portion 12.

Each through hole 15 has a rectangular shape with the circumferential direction of the electric wire 10 as the longitudinal direction.
The plurality of through holes 15 are evenly distributed along the circumferential direction of the insulating coating 13 and arranged in two rows in the longitudinal direction of the electric wire 10.

The method for connecting the electric wire according to the second embodiment is the same as the manufacturing method except that the through hole 15 is formed in place of the through hole 14 of the first embodiment in the water blocking agent penetrating portion forming step. is there.

The water-stopping connection structure 2 of the electric wire according to the second embodiment of the present invention has an insulating coating to which the water-stopping agent W is applied, including the exposed conductor portion 12 from which the insulating coating 13 connecting the plurality of electric wires 10 to each other has been removed. A through hole 15 is formed in the coated end portion 13a of the insulating coating 13 inside the end surface 13b of the insulating coating 13.
Therefore, the water blocking connection structure 1 of the electric wire according to the second embodiment of the present invention can penetrate the water blocking agent W into the plurality of metal strands 11a inside the coated end portion 13a through the through hole 15, resulting in the result. Therefore, the water stopping performance can be improved by increasing the permeation amount of the water blocking agent W into the plurality of metal strands 11a of the electric wire 10.

Further, in the water-stop connection structure 2 of the electric wire according to the second embodiment of the present invention, since the plurality of through holes 15 are evenly distributed along the circumferential direction of the insulating coating 13, the through holes 15 are covered. The water blocking agent W can be evenly permeated along the circumferential direction into the plurality of metal strands 11a inside the end portion 13a.

In the method of water-stopping connection of electric wires according to the second embodiment of the present invention, the water-stopping agent includes the exposed conductor portion 12 from which the insulating coating 13 to which the plurality of electric wires 10 are connected to each other is removed by the water-stopping agent penetrating portion forming step. A through hole 15 is formed in the coated end portion 13a of the insulating coating 13 to which W is applied, inside the end surface 13b of the insulating coating 13.
Further, in the water-stopping connection method of the electric wire according to the second embodiment of the present invention, after the water-stopping agent permeation portion forming step, the end portion of the electric wire 10 including the conductor exposed portion 12 and the coated end portion 13a by the water-stopping agent application step The water blocking agent W is applied to the water.
Therefore, the water-stopping connection method for the electric wire according to the second embodiment of the present invention can allow the water-stopping agent W to permeate into a plurality of metal strands 11a inside the coated end portion 13a through the through hole 15, resulting in In addition, the water blocking performance can be improved by increasing the permeation amount of the water blocking agent W into the plurality of metal strands 11a of the electric wire 10.

Next, the water-stop connection structure 3 of the electric wire and the water-stop connection method of the electric wire according to the third embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a diagram in which (a) shows the water-stopping connection structure 3 of the electric wire according to the third embodiment of the present invention, and (b) is an enlargement of the periphery of the covered end portion 13a of the electric wire 10 shown in (a). It is a figure that was made.

The water-stop connection structure 3 of the electric wire and the water-stop connection method of the electric wire according to the third embodiment of the present invention are in that a plurality of slits 16 are formed in the coated end portion 13a of each electric wire 10 instead of a plurality of through holes. , It is different from the water-stop connection structure 1 of the electric wire of the first embodiment and the water-stop connection method of the electric wire.
The other configurations are the same as those in the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the water-stopping connection structure 3 of the electric wire, the conductor portion 11 in which the plurality of metal strands 11a are bundled is surrounded by the insulating coating 13, and the insulating coating 13 of the terminal portion in which the plurality of electric wires 10 are connected to each other is removed. A plurality of slits 16 cut from the end surface 13b of the insulating coating 13 are formed in the covering end portion 13a of the insulating coating 13 to which the waterproofing agent W is applied, including the exposed portion 12.

Each slit 16 has a linear shape along the extending direction of the electric wire 10.
The plurality of slits 16 are evenly distributed along the circumferential direction of the insulating coating 13.

The method for connecting the water-stopping connection of the electric wire according to the third embodiment is the same as the manufacturing method except that the slit 16 is formed in place of the through hole 14 of the first embodiment in the water-stopping agent penetrating portion forming step. ..

The water-stopping connection structure 3 of the electric wire according to the third embodiment of the present invention has an insulating coating to which the water-stopping agent W is applied, including the exposed conductor portion 12 from which the insulating coating 13 connecting the plurality of electric wires 10 to each other has been removed. A slit 16 cut from the end surface 13b of the insulating coating 13 is formed in the covering end portion 13a of 13.
Therefore, the water-stopping connection structure 3 of the electric wire according to the third embodiment of the present invention can allow the water-stopping agent W to penetrate into the plurality of metal strands 11a inside the coated end portion 13a through the slit 16. In addition, the water blocking performance can be improved by increasing the permeation amount of the water blocking agent W into the plurality of metal strands 11a of the electric wire 10.

Further, in the water-stop connection structure 3 of the electric wire according to the third embodiment of the present invention, since the plurality of slits 16 are evenly distributed along the circumferential direction of the insulating coating 13, the covering end portion is passed through the plurality of slits 16. The water blocking agent W can be evenly permeated into the plurality of metal strands 11a inside the 13a along the circumferential direction.

In the method of water-stopping connection of electric wires according to the third embodiment of the present invention, the water-stopping agent includes the exposed conductor portion 12 from which the insulating coating 13 to which the plurality of electric wires 10 are connected to each other is removed by the water-stopping agent penetrating portion forming step. A slit 16 cut from the end surface 13b of the insulating coating 13 is formed in the covering end portion 13a of the insulating coating 13 to which W is applied.
Further, in the water-stopping connection method of the electric wire according to the third embodiment of the present invention, after the water-stopping agent permeation portion forming step, the end portion of the electric wire 10 including the conductor exposed portion 12 and the coated end portion 13a by the water-stopping agent application step The water blocking agent W is applied to the water.
Therefore, in the method of water-stopping connection of the electric wire according to the third embodiment of the present invention, the water-stopping agent W can be permeated into a plurality of metal strands 11a inside the coated end portion 13a through the slit 16, and as a result, The water stopping performance can be improved by increasing the permeation amount of the water blocking agent W into the plurality of metal strands 11a of the electric wire 10.

Next, the water-stop connection structure 4 of the electric wire and the water-stop connection method of the electric wire according to the fourth embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a diagram in which (a) shows the water-stop connection structure 4 of the electric wire according to the fourth embodiment of the present invention, and (b) is an enlargement of the periphery of the covered end portion 13a of the electric wire 10 shown in (a). It is a figure that was made.

In the water-stop connection structure 4 of the electric wire and the water-stop connection method of the electric wire according to the fourth embodiment of the present invention, a spiral slit 17 is formed in the covered end portion 13a of each electric wire 10 instead of the plurality of through holes 14. In that respect, it is different from the water-stop connection structure 1 of the electric wire of the first embodiment and the water-stop connection method of the electric wire.
The other configurations are the same as those in the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the water-stopping connection structure 4 of the electric wire, the conductor portion 11 in which the plurality of metal strands 11a are bundled is surrounded by the insulating coating 13, and the insulating coating 13 of the terminal portion in which the plurality of electric wires 10 are connected to each other is removed. A slit 17 spirally cut from the end surface 13b of the insulating coating 13 is formed in the covering end portion 13a of the insulating coating 13 to which the waterproofing agent W is applied, including the exposed portion 12.

The method of water-stopping connection of the electric wire according to the fourth embodiment is the same as the manufacturing method except that the slit 17 is formed in place of the through hole 14 of the first embodiment in the water-stopping agent penetrating portion forming step. ..

The water-stopping connection structure 4 of the electric wire according to the fourth embodiment of the present invention has an insulating coating to which the water-stopping agent W is applied, including the exposed conductor portion 12 from which the insulating coating 13 connecting the plurality of electric wires 10 to each other has been removed. A slit 17 cut from the end surface 13b of the insulating coating 13 is formed in the covering end portion 13a of 13.
Therefore, the water blocking connection structure 4 of the electric wire according to the fourth embodiment of the present invention can permeate the water blocking agent W into the plurality of metal strands 11a inside the covering end portion 13a through the slit 17, resulting in the result. In addition, the water blocking performance can be improved by increasing the permeation amount of the water blocking agent W into the plurality of metal strands 11a of the electric wire 10.

In the method of water-stopping connection of electric wires according to the fourth embodiment of the present invention, the water-stopping agent includes the exposed conductor portion 12 from which the insulating coating 13 to which the plurality of electric wires 10 are connected to each other is removed by the water-stopping agent penetrating portion forming step. A slit 17 cut from the end surface 13b of the insulating coating 13 is formed in the covering end portion 13a of the insulating coating 13 to which W is applied.
Further, in the water-stopping connection method of the electric wire according to the fourth embodiment of the present invention, after the water-stopping agent penetrating portion forming step, the end portion of the electric wire 10 including the conductor exposed portion 12 and the coated end portion 13a is subjected to the water-stopping agent application step. The water blocking agent W is applied to the water.
Therefore, in the method of water-stopping connection of the electric wire according to the fourth embodiment of the present invention, the water-stopping agent W can be permeated into a plurality of metal strands 11a inside the coated end portion 13a through the slit 17, and as a result, the water-stopping agent W can be permeated. The water stopping performance can be improved by increasing the permeation amount of the water blocking agent W into the plurality of metal strands 11a of the electric wire 10.

In the water-stopping connection method of the electric wire according to the first to fourth embodiment of the present invention, as a method of applying the water-stopping agent W, the end of the electric wire 10 including the conductor exposed portion 12 and the coated end portion 13a on the conductor exposed portion 12 side. The method of immersing the portion in the water blocking agent W housed in the tank B has been shown, but the method of applying the water blocking agent W is not limited to this, and the conductor exposed portion 12 and the coated end portion on the conductor exposed portion 12 side are not limited to this. The water blocking agent W may be applied to the end of the electric wire 10 including 13a by spraying.

Further, in the water-stop connection structure 1-3 of the electric wire and the water-stop connection method of the electric wire according to the third embodiment of the present invention, the plurality of through holes 14, 15 or the plurality of slits 16 are in the circumferential direction of the insulating coating. However, the example thereof is not limited to this, as long as one or more through holes or slits are formed in the coated end portion 13a.

The invention made by the present inventor has been specifically described above based on the above-mentioned examples of the invention, but the present invention is not limited to the above-mentioned examples of the invention and does not deviate from the gist thereof. Can be changed in various ways.

1, 2, 3, 4 Electric wire waterproof connection structure 10 Electric wire 11 Conductor part 11a Metal wire 12 Conductor exposed part 13 Insulation coating 13a Covered end part 13b End face 14, 15 Through hole 16, 17 Slit 20 Splice part 30 Heat shrinkage Cap B Tank W Water stop agent

Claims (3)

The conductor portion in which a plurality of metal strands are bundled is surrounded by an insulating coating. The water blocking agent is applied to the terminal portion where the plurality of electric wires are connected to each other, including the exposed conductor portion from which the insulating coating has been removed. A water-stop connection structure for an electric wire, characterized in that a through hole or a slit cut from the end face of the insulation coating is formed inside the end face of the insulation coating at the coating end portion of the insulation coating. The through hole or the slit
The water-stop connection structure for an electric wire according to claim 1, wherein the plurality of through holes or slits are evenly distributed along the circumferential direction of the insulating coating. Inside the end face of the insulation coating on the exposed portion side of the conductor from which the insulation coating has been removed from the end portion of the electric wire in which the conductor portion in which a plurality of metal strands are bundled is surrounded by the insulation coating. A step of forming a water blocking agent penetrating portion, in which a through hole is formed in, or a slit is cut and formed from the end face of the insulating coating.
After the water blocking agent penetrating portion forming step, a water blocking agent application step of applying the water blocking agent to the end portion of the electric wire including the conductor exposed portion and the coated end portion,
A waterproof connection method for electric wires, which comprises.

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