JPH11135162A - Mold structure of concentratedly spliced part and forming method of mold structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent insulated conductors from being exposed from an insulated part when a terminal concentrated-splice is coated with a molded insulated part. SOLUTION: For plural wires 15 which are to be spliced concentratedly, insulated coated parts 16B are left at the tip parts of the each wires, and the insulated coated parts 16B are moved up to the further tip side the tips of insulated conductors, and also exposed insulated conductors 17 following the insulated coated parts 16B are spliced concentratedly. Insulated coated parts 16A at the tips, concentratedly spliced parts 10 and the each insulated coated parts 16B of the focused group of the wires following the concentratedly spliced parts 10 are inserted into a metal mold, and the tip faces of the insulated coated parts 16A are contacted with the bottom face 1b of a cavity and positioned, retained, and then molded integrally with an insulating resin 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold structure for a concentrated splice portion and a molding method for forming the structure, and more particularly to a method for securely sealing a distal end portion of a terminal concentrated splice portion.

[0002]

2. Description of the Related Art In a wire harness used for an automobile or the like, a splice portion for connecting core wires of an electric wire is formed in order to achieve branch connection of a circuit. As a method of forming the splice, instead of the intermediate splice, a method of exposing a core wire from the end of each electric wire and providing a terminal concentrated splice portion that collects and connects these core wires intensively has a small number of work steps and efficiently. It has been widely used recently because it can be done.

[0003] As a method of insulating the terminal concentrated splice portion, a method of covering with a resin cap is used. However, the number of parts is increased, and work steps such as filling a sealing material in the cap are also required. There are many problems. Therefore, a method has been proposed in which a terminal concentrated splice portion is inserted into a mold and molded with an insulating resin.

That is, as shown in FIG. 4A, the terminal concentrated splice portion 2 of the wire group W is inserted into the mold 1 and the terminal concentrated splice portion 2 is mounted on the bottom surface 1b of the cavity 1a of the mold 1. Hold the tip against the end. In this state, the cavity 1a is filled with the insulating resin 3 and the resin is cured.
As shown in FIG. 4B, the insulating portion 4 of the terminal concentrated splice portion is formed.

[0005]

As shown in FIG. 4A, when the tip of the terminal concentrated splice portion 2 abuts against the bottom surface 1b in the cavity 1a of the mold 1, the positioning and holding of the wire group W is performed. However, since the distal end surface 2a of the terminal concentrated splice portion 2 is in contact with the bottom surface 1b, the insulating resin 3 does not easily flow around the distal end surface 2a, and the core wire 5 of each electric wire located on the distal end surface 2a is shown in FIG. As shown in B), there is a possibility that it is exposed to the outside, and there is a possibility that the insulation sealing is not reliably performed.

The present invention has been made in view of the above-mentioned problem, and has as its object to prevent the core wire of the terminal concentrated splice portion from being exposed to the outside and to be surely insulated and sealed by the mold insulating portion.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method of forming a plurality of wires to be spliced in a concentrated manner by leaving an insulating coating portion at each wire tip and connecting the insulating coating portion to the tip of the core wire. Side, and the exposed core wire is concentratedly spliced following the insulating coating portion. Each of the insulating coating portion at the tip, the concentrated splice portion, and each of the bundles of bundled electric wires continuous with the concentrated splice portion are separated. There is provided a mold structure of a concentrated splice portion, wherein a covering portion is integrally molded with an insulating resin.

[0008] It is preferable to provide a cut portion inclined from the front end surface in the insulating coating portion on the front end side. When the inclined cut portion is provided, the resin easily flows around and the resin easily penetrates from the inclined cut portion to the inside of the insulating coating portion, so that the insulating resin can be reliably filled in the insulating coating.

In the mold structure of the concentrated splice portion, the leading end surface of the insulating coating portion at the leading end is brought into contact with the bottom surface of the cavity of the die to position and hold the same, and is connected to the concentrated splice portion and the concentrated splice portion. The insulating covering portions of the plurality of bundled electric wires are inserted into the cavity, and in this state, the cavity is filled with an insulating resin, and the insulating resin is cured to be formed.

As the insulating resin, a thermoplastic resin such as PVC (vinyl chloride resin) is used.

When the mold structure of the concentrated splice portion is formed by the above-described method, the core is not exposed on the outer surface of the mold portion because the insulating coating portion is left on the front end surface where the resin does not easily flow. Sealing can be achieved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 (A), 1 (B), and 1 (C), the electric wire group W has a concentrated splice portion 10 near its distal end.
And the front and rear sides including the concentrated splice portion 10 are covered with a molded insulating portion 11.

As shown in FIG. 2A, each electric wire 15 of the electric wire group W is located at a position apart from a tip 15a by a required dimension.
A cut is made in the insulating coating 16, and thereafter, the insulating coating 16 is moved to the distal end side to expose the core wire 17 and leave the insulating coating portion 16 </ b> A at the distal end from the core wire 17. Therefore, in the insulating coating portion 16A at the tip, a portion 16A-1 in which only the insulating coating 16 protrudes from the core wire 17.
Exists.

As described above, the insulating coating portion 16A
The electric wire group W with the core wire 1 is connected to the core wire 1 as shown in FIG.
The portions 7 are overlapped and welded from both upper and lower sides thereof by a welding machine 19 to be integrally fixed, thereby forming a concentrated splice portion 10 as shown in FIG. 2 (D).

In the state where the concentrated splice portion 10 is formed, as shown in FIG. 2E, it is inserted into the cavity 1a of the mold 1 for molding, and the bottom surface 1b of the cavity is provided with the insulating coating portion 16A at the tip. The tip end surface 16A-2 is brought into contact with and positioned and held. In this state, the concentrated splice unit 10
Then, the insulating covering portions 16B of the plurality of bundled electric wires continuous with the concentrated splice portion 10 are inserted into the cavity 1a.

Next, the mold 1 is closed, and the cavity 1a is filled with an insulating thermosetting resin 3 such as vinyl chloride from the injection port 1c. The mold 1 is heated at a required temperature to cure the insulating resin 3. When taken out from the mold 1 after curing, as shown in FIG. 1, a structure in which both front and rear sides including the concentrated splice portion 10 are covered with the molded insulating portion 11 is obtained.

As described above, the cavity bottom surface 1 of the mold 1
When the insulating coating portion 16A at the tip is brought into contact with the insulating coating portion b, the insulating resin 3 easily wraps around the gap between the adjacent insulating coating portions 16A, and the wrapped insulating resin 3 penetrates into the hollow portion through the opening at the tip of each insulating coating portion. Then, the hollow portion is filled with the insulating resin 3.

As described above, since the insulating covering portion 16 is left on the distal end side of the exposed core wire 17 to be spliced in a concentrated manner, the core wire 17 is not exposed on the distal end surface of the molded insulating portion 11, and the Sealing can be ensured.

FIGS. 3A and 3B show a second embodiment.
The insulating coating portion 16A on the distal end side is provided with an inclined cut portion 20 from the distal end. When the inclined cut portion 20 is provided in this way, the hollow portion of the insulating covering portion 16A can be more reliably penetrated and filled into the hollow portion of the insulating covering portion 16A than the inclined cut portion 20 in the cavity of the mold.

[0020]

As is apparent from the above description, according to the present invention, the concentrated splice portion is provided near the terminal, and the insulating coating portion is left at the tip side of the concentrated splice portion.
When the concentrated splice portion is covered with the molded insulating portion, the core wire is not exposed from the tip of the molded insulating portion, and the insulating seal can be surely achieved.

In particular, if the insulating coating portion on the distal end side is provided with an inclined cut portion from the distal end surface, the insulating resin permeates the hollow portion of each insulating coating portion more reliably from the inclined cut portion and is filled. The insulation sealing performance can be improved.

[Brief description of the drawings]

1A is a perspective view showing a mold structure according to a first embodiment of the present invention, FIG. 1B is a cross-sectional view, and FIG. 1C is an enlarged cross-sectional view of a main part of FIG.

FIGS. 2A, 2B, 2C, 2D, and 2E are schematic diagrams showing a forming process according to the first embodiment; FIGS.

FIG. 3A is a perspective view showing an electric wire according to a second embodiment,
(B) is an enlarged sectional view of a molded part.

FIG. 4A is a schematic view showing a conventional molding method, and FIG. 4B is a perspective view of a molded insulating part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die 1a Cavity 1b Bottom surface 3 Insulation resin 10 Centralized splice part 11 Insulation part 15 Electric wire 16 Insulation coating 16A Insulation coating part on the tip side 17 Core wire 20 Incline cut part

Claims (3)

[Claims] 1. A plurality of electric wires to be spliced in a concentrated manner, while leaving an insulating coating portion at the end of each electric wire, moving the insulating coating portion toward the distal end side from the core wire end, and exposing the plurality of electric wires following the insulating coating portion. The core wire is concentrated spliced, and the insulating coating portion at the tip, the concentrated splice portion, and the respective insulating coating portions of the bundled wires continuous with the concentrated splice portion are integrally molded with an insulating resin. The mold structure of the concentrated splice part. 2. The mold structure of a concentrated splice part according to claim 1, wherein an inclined cut portion is provided at an end of the insulating coating portion from the end surface of each insulating coating portion. 3. A method for forming a mold structure of a concentrated splice part according to claim 1 or 2, wherein a tip surface of the insulating coating portion at the tip is brought into contact with a bottom surface of a cavity of a mold. Positioning and holding, inserting the insulating coating portions of the concentrated splice portion and the plurality of bundled electric wires continuous with the concentrated splice portion into the cavity, filling the cavity with the insulating resin in this state, and curing the insulating resin. A method for forming a mold structure of a concentrated splice portion formed by the above method.