JP7359629B2 - Water-stopping structure for wire end splices and water-stopping method for wire end splices - Google Patents

Description

The present invention relates to a water-stopping structure for an electric wire end splice portion and a water-stopping method for an electric wire end splice portion.

Conventionally, when electrically connecting the wires of a wire harness installed in a car, the insulation coatings of multiple wires are removed and the exposed conductor parts (terminal wires) are bonded together by thermocompression. Connect by forming a wire end splice with a joint such as. When such a wire harness is mounted on a vehicle, water-stopping (waterproofing) treatment is applied between the wires at the wire end splice portion.

For example, in Patent Document 1, uncured resin is injected into a cylindrical cap with a bottom, the electric wire end splice portion and its vicinity are inserted into the uncured resin in the cap, and then the uncured resin is injected into the cap. A water-stopping structure and a water-stopping method for a wire end splice portion in which a cured resin is cured and fixed are described.

Japanese Patent Application Publication No. 10-243539

In the water stop structure and water stop method for electric wire end splice parts described in Patent Document 1, when a photocurable resin is used as the uncured resin, special equipment such as a dispenser is required to inject the resin at a wire harness factory. It is required at each wire harness factory, and is expensive and has poor workability. In addition, in the case of photocurable resin, it is necessary to manage the material so that it is not exposed to light.

The present invention has been made in view of the problems of the prior art. It is an object of the present invention to provide a water-stopping structure for a wire end splice portion, which can improve workability and reduce costs when water is stopped between strands of the wire end splice portion, and a wire end splice portion. The objective is to provide a water stoppage method.

A water-stopping structure for a wire end splice portion according to an aspect of the present invention includes a wire end splice portion formed by jointing the ends of a plurality of wires from which insulation coatings have been removed, and a wire end splice portion that covers the wire end splice portion and its vicinity. The cap has a cylindrical bottom shape and is made of synthetic resin, and a photocurable resin layer that seals and fixes the electric wire end splice portion and its vicinity and the cap between the caps. It has a sealing member that seals the cap in a state in which a curable resin is injected in advance, and the sealing member has a structure that is removed after or before the photocurable resin in the cap is cured.

Preferably, the sealing member is a lid made of synthetic resin that opens and closes the opening of the cap.

Preferably, the sealing member is a thin layer of thermosetting resin that is injected onto the photocurable resin after the photocurable resin is injected into the cap.

A water-stopping method for a wire end splice portion according to another aspect of the present invention includes injecting a photocurable resin in advance through an opening of a bottomed cylindrical cap made of synthetic resin, and then injecting the photocurable resin into the cap. The opening of the cap is sealed with a sealing member, and after or while removing the sealing member, the terminals of the plurality of electric wires from which the insulation coating has been removed are jointed into the photocurable resin in the cap. In this method, the electric wire end splice portion and its vicinity are inserted, and the photocurable resin is cured to close and fix the space between the electric wire end splice portion and its vicinity and the cap.

According to the present invention, there is provided a water stop structure for a wire end splice portion and a water stopper for the wire end splice portion that can improve workability and reduce costs when water is stopped between wires at the wire end splice portion. water method can be provided.

FIG. 2 is a cross-sectional view showing an example of a water-stopping structure of the electric wire end splice portion according to the first embodiment of the present invention. It is a perspective view of the cap used for the above-mentioned water stop structure. (a) is a plan view of a hinge portion that connects the cap body and the lid body of the cap, and (b) is a side view of the hinge portion. It is an explanatory view showing the state where photocurable resin is injected into the above-mentioned cap. It is a sectional view of the cap in which the above-mentioned photocurable resin is injected and the lid body is closed. (a) is a perspective view of a packaging container containing a cap in which the photocurable resin is injected and the lid is closed, before the top lid is put on, and (b) is a perspective view of the packaging container with the top lid closed. . FIG. 3 is a cross-sectional view showing a state before the electric wire end splice portion is inserted into the photocurable resin in the cap. FIG. 3 is a sectional view showing a state in which the electric wire end splice portion and its vicinity are inserted into the photocurable resin in the cap. FIG. 3 is a cross-sectional view showing a state in which the lid of the cap is cut and removed after the photocurable resin inside the cap has hardened. It is a perspective view which shows the water stop structure of the electric wire end splice part of 2nd Embodiment of this invention. It is a perspective view of the cap used for the water stop structure of the said 2nd Embodiment. It is an explanatory view showing the state where photocurable resin is injected into the cap of the water stop structure of the above-mentioned 2nd embodiment. It is an explanatory view showing the state where thermosetting resin is further injected into the cap of the water stop structure of the above-mentioned 2nd embodiment. It is a sectional view of the cap in a state where the thermosetting resin is cured. (a) is a cross-sectional view showing the state before the electric wire end splice part is inserted into the photocurable resin in the cap with the water-stopping structure, and (b) is a sectional view showing the state where the wire end splice part is inserted into the photocurable resin inside the cap with the above-mentioned water-stopping structure. FIG. 3 is a cross-sectional view showing a state in which a wire end splice portion and its vicinity are inserted into a curable resin.

EMBODIMENT OF THE INVENTION Hereinafter, the water stop structure of the electric wire end splice part based on embodiment of this invention is demonstrated in detail using drawings.

FIG. 1 shows a water-stopping structure of a wire end splice portion formed by the water-stopping method of the first embodiment. 2 and 3 show a cap used in the water stop method. FIGS. 4 to 6 show the process from injecting photocurable resin into the cap at a parts factory to shipping. 7 to 9 show the steps of the water stop method.

As shown in FIG. 1, the water-stopping structure 10A of the electric wire end splice portion of the first embodiment has a bottomed cylindrical shape that covers the electric wire end splice portion 14 and the vicinity thereof, and is made of synthetic resin. The cap 20 is provided with a photocurable resin layer 31 for closing and fixing these.

The wire end splice portion 14 is formed by peeling off the insulation coating 12 at the ends of the plurality of wires 11 to expose the core wires (strands) 13, stacking these core wires 13 and joining them by thermocompression bonding such as ultrasonic welding to form a rectangular shape. It is a block of shapes. Between the wire end splice portion 14 and the cap 20 that surrounds the exposed core wire 13 and the insulation coating 12 in the vicinity thereof, a photocurable resin 30 that has been injected into the cap 20 in advance is irradiated with light at a wire harness factory. It is closed and fixed by a photocurable resin layer 31 that has been cured.

As shown in FIGS. 2 and 3, the cap 20 is made of a light-transmitting transparent material, and includes a cylindrical cap body 21 with a bottom, and a lid body (sealing body) that opens and closes an opening 21a of the cap body 21. (stop member) 22. The cap body 21 and the lid body 22 are connected via a hinge portion 23. A V-shaped notch 23a for cutting is formed on the upper and lower surfaces of the hinge portion 23, with an elliptical hole 23b in the center. This hinge portion 23 is cut after the photocurable resin 30 inside the cap body 21 is cured, and the lid body 22 is removed from the cap body 21.

As shown in FIGS. 4 and 5, a photocurable resin 30 is injected into the cap body 21 of the cap 20 in advance at a parts factory using dedicated equipment 40 such as a dispenser. The opening 21 a of the cap body 21 into which the photocurable resin 30 is injected is sealed by the lid 22 . Then, as shown in FIGS. 6(a) and 6(b), it is accommodated in each accommodation space 51 of the non-light-transmitting packaging container 50 so as not to fall down. After this packaging container 50 is covered with a non-light-transparent upper lid 52 and packed, it is shipped from a parts factory and supplied to each wire harness factory.

When forming the water stop structure 10A of the electric wire end splice portion of the first embodiment, the photocurable resin 30 is injected in advance through the opening 21a of the transparent cap 20 at a parts factory, and after the photocurable resin 30 is injected, A cap 20 whose opening 21a is sealed with a lid 22 is used.

Next, the process of forming the water stop structure 10A at the wire end splice portion will be explained with reference to FIGS. 7 to 9.

First, as shown in FIG. 7, the lid 22 that closes the opening 21a of the cap body 21 of the transparent cap 20 into which the photocurable resin 30 is injected in advance is opened.

Next, as shown in FIG. 8, the electric wire end splice portion 14 and its vicinity (insulating coating 12 and core wire 13) are placed in the photocurable resin 30 of the removed cap body 21 by opening the lid 22 from the opening 21a. Insert.

Then, the cap body 21 of the transparent cap 20 is irradiated with light to harden the photocurable resin 30 inside the cap body 21, and the photocurable resin 30 is cured at the wire end splice portion 14 and its vicinity and between the cap bodies 21. It is closed and fixed with a resin layer 31. Thereafter, as shown in FIG. 9, the hinge portion 23 is cut and the lid body 22 is removed and discarded, thereby forming the water stop structure 10A for the wire end splice portion shown in FIG. 1 at the wire harness factory. . Note that when the wire harness is mounted on a vehicle, if the lid 22 does not get in the way on the wiring route, the lid 22 may remain attached to the cap body 21 and does not need to be removed.

In this way, when water is to be stopped between the core wires 13 of the wire end splice section 14, the lid body 22 is integrally molded on the cap body 21 of the cap 20, and a photocurable resin is applied inside the cap body 21 at the parts factory. The resin 30 is injected and then the cap is supplied to each wire harness factory. Therefore, if a dedicated equipment 40 such as a dispenser for injecting the photocurable resin 30 into the cap 20 is installed only at the parts factory, there is no need to install it at each wire harness factory, and there is no need for material management. Accordingly, cost reduction can be achieved. In other words, it is possible to reduce the work of injecting the photocurable resin 30 into the cap 20 and the material management at each wire harness factory. Furthermore, it is possible to reduce capital investment for each wire harness factory. As a result, when forming the water stop structure 10A of the electric wire end splice portion at a wire harness factory, it is possible to further improve workability and reduce costs.

FIG. 10 shows a water-stopping structure of a wire end splice portion formed by the water-stopping method of the second embodiment. FIG. 11 shows a cap used in the water stop method. 12 to 14 show the injection of each resin into the cap at a parts factory. FIGS. 15(a) and 15(b) show the steps of the water stopping method.

As shown in FIGS. 10 and 15(b), the water stop structure 10B of the electric wire end splice portion is made of synthetic resin and has a cylindrical shape with a bottom that covers the electric wire end splice portion 14 and the vicinity thereof. The cap 20 has a photocurable resin layer 31 for sealing and fixing the cap 20. Between the wire end splice portion 14 and the cap 20 that surrounds the exposed core wire 13 and the insulation coating 12 in the vicinity thereof, a photocurable resin 30 that has been injected into the cap 20 in advance is irradiated with light at a wire harness factory. It is closed and fixed by a photocurable resin layer 31 that has been cured.

As shown in FIG. 11, the cap 20 is made of a light-transmitting transparent material and has a cap body 21 in the shape of a cylinder with a bottom. Further, as shown in FIGS. 12 and 13, a photocurable resin 30 is injected into the cap body 21 of the cap 20 in advance at a parts factory using dedicated equipment 40 such as a dispenser. After this photocurable resin 30 is injected, a small amount of a thermosetting resin 35 with a light specific gravity is injected onto the photocurable resin 30 inside the cap body 21 using a special equipment 40 such as a dispenser. . By curing this small amount of thermosetting resin 35, a thin film layer 36 is formed as a sealing member for sealing the opening 21a of the cap body 21, as shown in FIG. The cap 20, in which the opening 21a of the cap body 21 is sealed with a thin film layer 36 as a sealing member, is provided in each accommodation space of a non-light-transparent packaging container 50, as shown in FIGS. 6(a) and 6(b). 51 so as not to fall. After the packaging container 50 is covered with a non-light-transparent upper lid 52 and packed, it is shipped from a parts factory and supplied to each wire harness factory.

When forming the water stop structure 10B of the electric wire end splice portion of the second embodiment, a photocurable resin 30 and a thermosetting resin 35 with a light specific gravity are injected in advance in order from the opening 21a of the transparent cap 20 at a parts factory. However, the thermosetting resin 35 is sealed with a thin film layer 36 that is cured.

Next, the process of forming the water stop structure 10B at the wire end splice portion will be described with reference to FIGS. 15(a) and 15(b).

First, as shown in FIG. 15(a), from the opening 21a of the cap body 21 of the transparent cap 20 into which the photocurable resin 30 has been injected in advance, the electric wire end splice portion 14 and its vicinity (insulating coating 12 and core wire 13) are opened. ).

Then, as shown in FIG. 15(b), while the bulk electric wire end splice portion 14 breaks through and removes the thin film layer 36 formed by hardening the thermosetting resin 35 inside the cap body 21, the inside of the cap body 21 is photocured. The wire end splice portion 14 and its vicinity are inserted into the plastic resin 30.

Next, the cap body 21 of the transparent cap 20 is irradiated with light to harden the photocurable resin 30 inside the cap body 21, thereby photocuring the wire end splice portion 14 and its vicinity and between the cap bodies 21. It is closed and fixed with a synthetic resin layer 31. As a result, the water stop structure 10B for the electric wire end splice portion shown in FIG. 10 is formed at the wire harness factory.

As described above, in the water stop structure 10B and the water stop method for electric wire end splice portions of the second embodiment, a thin film formed by hardening the thermosetting resin 35 on the transparent cap 20 in which the photocurable resin 30 is injected in advance. By sealing with the layer 36, the same functions and effects as in the first embodiment can be achieved.

Although each embodiment has been described above, the embodiment is not limited to these, and various modifications can be made within the scope of the gist of each embodiment.

That is, according to each of the embodiments described above, a transparent cap is used, but a translucent cap may also be used.

Further, according to each of the above embodiments, the splice portion is formed at the end of the electric wire, but it goes without saying that the above embodiments can be applied to a wire in which the splice portion is formed in the middle of the electric wire.

10A, 10B Water-stop structure at wire end splice portion 11 Electric wire 12 Insulation coating 13 Exposed core wire (terminal)
14 Wire end splice part 20 Bottomed cylindrical cap made of synthetic resin 21a Opening 22 Lid body (sealing member)
30 Photocurable resin 31 Photocurable resin layer 35 Thermosetting resin 36 Thin film layer (sealing member)

Claims (1)

A photocurable resin is injected in advance through the opening of a synthetic resin cap having a cylindrical shape with a bottom, and after the photocurable resin is injected, the opening of the cap is sealed with a sealing member,
After or while removing the sealing member, inserting an electric wire end splice portion formed by joining the ends of a plurality of electric wires from which the insulation coating has been removed into the photocurable resin in the cap, and the vicinity thereof;
curing the photocurable resin to close and fix the wire end splice portion and its vicinity and the cap ;
The sealing member is a thin film layer of a thermosetting resin that is injected onto the photocurable resin after the photocurable resin is injected into the cap.

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