JPH10322870A - Waterproof processing method for cable connection and waterproof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the waterproof structure of the terminal connection of a cable, and besides, secure waterproofing. SOLUTION: A terminal connection 23 of a cable 27 is inserted into a hole 19 of a mold 18, and also resin material 25 is injected, and it is solidified, and the terminal connection is taken out in a body with the resin material 25 from the hole. A sump 22 expanded in diameter is provided on the bottom side of the hole 19, and the tip 23a of the terminal connection 23 is positioned within the sump. In the case it not providing the sump, the terminal connection is capped with a bottomed small cap, and then it is inserted into the hole. It will do by making the solidified resin material easy to take out by tapering the inwall of the hole. It will do to solidify the resin material 25 by adjusting the temperature of the mold 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method and a waterproof structure of an electric wire connecting portion for connecting the terminal portions of a plurality of electric wires by, for example, thermocompression bonding, and then waterproofing the terminal connecting portions with a resin material. It is about.

[0002]

2. Description of the Related Art FIGS. 15 and 16 show a conventional method of waterproofing an electric wire connection. In this waterproofing method, first, a fluid insulating resin material (filler) 46 is injected into a cap 45 made of synthetic resin as shown in FIG. 15, and then, as shown in FIG. Is embedded in the resin material 46, the resin material 46 is cured, and the wire end portion 49 is fixed in the cap 45.

The terminal connecting portion 48 is obtained by thermocompression bonding a plurality of core wires (conductor portions) 50 of a plurality of covered electric wires 47. The terminal connecting portion 48 is formed by a resin material 46 filled in a cap 45. Waterproof. As the resin material 46, for example, a thermosetting resin or the like is used.

[0004]

However, in the above-mentioned conventional waterproofing method, there is a concern that a gap 51 is likely to be formed on the upper portion of the cap 45, and that water accumulates in the gap 51 to deteriorate waterproofness. Was. Also, cap 45
However, there is a problem in that the cost of parts is increased and the structure becomes complicated and enlarged due to the use of the. Also, cap 4
It is necessary to perform a troublesome operation of injecting the resin material 46 while supporting the resin material 5, and furthermore, it is troublesome to arrange the products 52 in a heating temperature bath (not shown) in order to thermally cure the resin material 46. There was a problem that it took.

SUMMARY OF THE INVENTION In view of the above, the present invention provides an electric wire capable of preventing deterioration of waterproofness due to a gap in a cap, suppressing an increase in cost, complicating and enlarging the structure, and improving the efficiency of the waterproofing work. An object of the present invention is to provide a waterproofing method and a waterproofing structure for a connecting portion.

[0006]

In order to achieve the above object, the present invention provides a method of inserting a terminal connection portion of an electric wire into a hole of a molding die, injecting a resin material, and solidifying the resin material. ,
A method of waterproofing an electric wire connecting portion, wherein the terminal connecting portion is taken out of the hole portion integrally with a resin material is adopted (claim 1). It is also effective that the inner wall of the hole is formed in a tapered shape so that the solidified resin material can be easily extracted from the hole. It is also effective to provide a reservoir having an enlarged diameter on the bottom side of the hole in claim 1 and to position the tip of the terminal connection portion in the reservoir (claim 3). Alternatively, it is also effective to cover the terminal connection part with a small cap with a bottom and then insert the terminal connection part into the hole part. Further, it is also possible to solidify the resin material by controlling the temperature of the mold (claim 5). Further, in the waterproof structure of the electric wire connection portion in which the resin material is attached to the terminal connection portion of the electric wire, an enlarged diameter portion is formed on the distal end side of the resin material, and the distal end of the terminal connection portion is located in the enlarged diameter portion. And a waterproof structure of the electric wire connection part (claim 6), and that a small cap with a bottom is covered at the terminal connection part of the electric wire, and a resin material is attached to the outside of the small cap. A characteristic waterproof structure of the electric wire connection part (claim 7) is also adopted.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show one embodiment of a method for waterproofing an electric wire connection portion according to the present invention.

[0008] This waterproofing method is based on a mold 1 for resin molding.
A fluid insulating resin material 3 is injected into the hole 2 formed in (FIGS. 1 and 2), and then the wire terminal portion 6 including the terminal connection portion (thermocompression bonding portion) 5 of the covered wire 4 is inserted into the hole portion. 2 (FIG. 3), and after the resin material 3 is solidified or hardened, the resin material 3 ′ is pulled up together with the wire terminal portion 6, so that the resin material 3 ′ is outside the wire terminal portion 6 including the terminal connection portion 5. 3 'is obtained.

As shown in FIG. 1, a mold (molding die) 1 is provided with a plurality of holes 2 vertically and horizontally in parallel. Hole 2 as shown in FIG.
A tapered inner peripheral wall 10 from the opening 9;
And a bottom wall 11 having a semicircular cross section. The tapered inner peripheral wall 10 facilitates and reliably removes the resin material 3 ′. Extraction of the resin material 3 ′ is easily performed by pulling the covered electric wire 4.

When the thermosetting resin material 3 is used, it is possible to directly control the temperature of the mold 1 to accelerate the curing of the resin material. That is, it is possible to place the mold 1 on a heater (not shown) or the like to directly heat it, or to provide a heater (not shown) inside the mold 1 to control the temperature. This eliminates the need for a conventional heating temperature bath. In addition, the temperature of the thermoplastic resin material can be controlled so that the mold 1 is cooled.

As shown in FIG. 3, the tip 5a of the terminal connecting portion 5, that is, the tip 5a of the portion 5 in which the core strands 7 of the plurality of insulated wires 4 are thermocompression-bonded to each other is slightly upward from the bottom wall of the hole 2. It is set so as to be located at a distance and at the center of the hole 2. The resin material 3 is injected until it covers the covering portion 8 of the electric wire 4. The resin material 3 covers the terminal connection portions 5 and penetrates between the coating portions 8. After the resin material 3 is solidified, the electric wire 4 is pulled, whereby the resin material 3 ′ is pulled out of the hole 2 integrally with the terminal connection portion 5.

As a result, as shown in FIG. 4, a conventional waterproof structure using only the resin material 3 'without using a cap is obtained, and the structure is simplified and made compact. Corresponding to the shape of the hole 2, the outer peripheral surface 12 of the resin material 3 'has a tapered shape whose diameter gradually increases toward the covering portion 8 side.

FIG. 5 shows that the wire end portion 13 is bent and the mold 1 is bent.
5 shows a state in which the resin material 17 has been inserted into the hole 16 and the tip end 14a of the terminal connection portion 14 is exposed or protrudes from the solidified resin material 17 'as shown in FIG. There is a concern that it will.

In order to prevent this, the following embodiment is proposed. FIGS. 7 to 10 show one embodiment of the present invention. As shown in FIG. 8, a straight portion on the inlet 20 side of the hole 19 is formed at the bottom of the hole 19 of the resin molding die 18. A terminal connection portion (thermocompression bonding portion) is formed in the pool portion 22 in a state where a spherical pool portion (expanded portion) 22 having a diameter larger than 21 is formed and a fluid resin material 25 is injected as shown in FIG. The tip 23a of 23 is positioned.

As shown in FIG. 9, even if the terminal portion 24 of the electric wire 27 is inserted into the hole 19 in a bent state, the distal end 23a of the terminal connecting portion 23 is located slightly away from the inner wall surface 22a of the pool portion 22. 10, there is no concern that the distal end 23a of the terminal connecting portion 23 is exposed outside the resin material 25 'after the solidified resin material 25' is taken out as shown in FIG. The terminal connection part 23 is a spherical head (enlarged diameter part) of the resin material 25 ′ corresponding to the pool part 22.
26. Note that the diameter-enlarging portion 26 is not limited to a spherical shape, and may be any shape as long as its circumference is annularly expanded, such as a columnar or conical shape. The configuration of FIG. 10 is also effective as a waterproof structure for the electric wire connection part.

As shown in FIG. 7, the mold 18 is configured to be divided into front and rear portions from the center of the hole 19. This split mold 18
₁ and 18 ₂ , the enlarged diameter portion 26 of the solidified resin material 25 ′
Can be taken out. In this example, since the product 28 is taken out by dividing the mold 18, it is not necessary to form the hole 19 in a tapered shape as in the previous example.

FIGS. 11 to 14 show another embodiment for preventing the terminal connecting portion from being exposed. In this example, the terminal portion 31 of the electric wire 30, that is, the thermocompression bonding portion 3 of the core element wire 32
1 is covered with a small cap 33 made of an insulating resin. In this state, an electric wire terminal 36 including the small cap 33 is inserted into the hole 35 of the molding die 34, and a fluid resin material 37 is formed.
And then hardened, and then the solidified resin material 37 'is inserted through the hole 35 into the small cap 3 as in the embodiment of FIGS.
Take out all three.

As shown in FIG. 11, the small cap 33 is formed in a rectangular shape, and includes a rectangular cylindrical wall 38 and a bottom wall 39. By inserting (press-fitting) the terminal connecting portion 31 having a substantially circular cross section into the small cap 33 having a rectangular or polygonal cross section, the terminal connecting portion 31 comes into close contact with the inner wall of the small cap 33 as shown in FIG. 33 is prevented from falling. Of course, it is also possible to form the small cap with a circular cross section. Further, the inner wall 40 of the hole 35 can be tapered.

As shown in FIG. 13, even when the wire terminal 36 is inserted into the hole 35 in a bent state, the inner wall 4
Since the end of the small cap 33, that is, the bottom wall 39 abuts on the small cap 33, and the terminal connection portion 31 is accommodated in the small cap 33, the cured resin material 37 'as shown in FIG.
When the small cap 33 is taken out from the housing, even if the tip 39 of the small cap 33 is exposed from the resin material 37 ', the terminal connecting portion 31 cannot be exposed. Thereby, the terminal connection unit 31
The waterproof property is secured. The configuration of FIG. 14 is also effective as a waterproof structure for the electric wire connection part.

[0020]

As described above, according to the first aspect of the present invention, since the conventional cap is not used, the problem that water accumulates in the gap between the caps and the waterproof property is deteriorated is eliminated, and the parts are eliminated. The cost is reduced, the structure is simplified and compact, and the work for supporting the cap is not required, so that the workability is improved. According to the second aspect of the present invention, the solidified resin material can be easily extracted from the hole, and the workability is improved. Claims 3 and 6
According to the described invention, even when the wire end is bent and inserted into the hole, the end of the terminal connection is located inside the pool, so the end of the terminal connection is outside the solidified resin material. There is no exposure. According to the invention of claims 4 and 7, since the tip of the terminal connection portion is covered with the bottom of the small cap, even when the wire terminal portion is bent and inserted into the hole, the tip of the terminal connection portion is not bent. Without being exposed to the outside,
Waterproofness is ensured. According to the fifth aspect of the present invention, by directly heating or cooling the mold, the work of arranging the cap on the temperature layer in the related art becomes unnecessary, and the workability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a molding die in one embodiment of a method for waterproofing an electric wire connection portion according to the present invention.

FIG. 2 is a longitudinal sectional view showing a hole of a molding die.

FIG. 3 is a longitudinal sectional view showing a state in which a resin material is adhered to a wire end portion in the same hole.

FIG. 4 is a plan view showing a product formed by the waterproofing method.

FIG. 5 is a longitudinal sectional view showing a state where the wire end portion is bent and inserted into the hole in FIG. 3;

FIG. 6 is a longitudinal sectional view showing a product taken out of the hole.

FIG. 7 is a perspective view showing a molding die in a second embodiment of the waterproofing method of the electric wire connection portion.

FIG. 8 is a longitudinal sectional view showing a hole of the molding die.

FIG. 9 is a longitudinal sectional view showing a state in which the wire end is bent and inserted into the hole.

FIG. 10 is a longitudinal sectional view showing a product (an example of a waterproof structure of an electric wire connection portion) taken out from a hole.

FIG. 11 is an exploded perspective view showing a state in which a small cap is inserted into a terminal connection portion as a third embodiment of a method for waterproofing a wire connection portion.

FIG. 12 is a plan view showing a state in which a small cap is attached to a terminal connecting portion.

FIG. 13 is a longitudinal sectional view showing a state in which the capped wire end is bent and inserted into the hole.

FIG. 14 is a longitudinal sectional view showing a product (another example of a waterproof structure of an electric wire connection portion) taken out from a hole.

FIG. 15 is a longitudinal sectional view showing a state in which a resin material is injected into a cap as a conventional method of waterproofing a wire connection portion.

FIG. 16 is a longitudinal sectional view showing a state where an electric wire is inserted into a resin material.

[Explanation of symbols]

 1,18,34 Die (molding die) 2,19,35 Hole 3,25,37 Resin 3 ', 25', 37 'Resin (solidified) 4,27,30 Electric wire 5,23, 31 Terminal connection part 22 Reservoir part 26 Large diameter part 33 Small cap

Claims (7)

[Claims] 1. After inserting a terminal connection portion of an electric wire into a hole of a molding die and injecting a resin material, and solidifying the resin material,
A method for waterproofing an electric wire connection portion, wherein the terminal connection portion is taken out of the hole portion together with a resin material. 2. An inner wall of the hole is formed in a tapered shape.
2. The method according to claim 1, wherein the solidified resin material is easily extracted from the hole. 3. The electric wire connection part according to claim 1, wherein a reservoir part having an enlarged diameter is provided on a bottom side of the hole part, and a tip of the terminal connection part is located in the reservoir part. Waterproof treatment method. 4. The terminal connection portion is covered with a small cap having a bottom and then inserted into the hole.
Or the waterproofing method of the electric wire connection part of 2. 5. The method according to claim 1, wherein the temperature of the mold is controlled to solidify the resin material. 6. A waterproof structure for an electric wire connection part in which a resin material is attached to a terminal connection part of an electric wire, wherein an enlarged diameter part is formed at a tip end side of the resin material, and the terminal connection part is formed inside the enlarged diameter part. The waterproof structure of the wire connection part, characterized in that the tip is located. 7. A waterproof structure for an electric wire connection portion, wherein a small cap with a bottom is covered at a terminal connection portion of the electric wire, and a resin material is applied outside the small cap.