JPH0521125A - Connecting method for lead wire - Google Patents

Abstract

PURPOSE:To provide a method high in reliability for connecting lead wires, which hardly shortcircuits, the lead wires by preventing core wires from being scattered after the lead wires have been connected. CONSTITUTION:An insulating cover formed at the intermediate section of the wiring of a base lead wire 10 removed, so that an exposed section 10a is formed in a base core wire 11. And an exposed section 21b is also formed in a connecting core wire 21 in a state that an insulation cover end section 22a is left over at the tip end section of a connecting lead wire 20. Next, the exposed section 11a and the exposed section 21b are caulked by the use of a joint terminal 25, the exposed section 11a, the exposed section 21b and the joint terminal 25 are covered with an insulating tape 26 thereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting lead wires in electric wiring.

[0002]

2. Description of the Related Art Generally, in electrical equipment such as automobiles, many lead wires are used for electrical wiring constituting an electrical circuit.
Conventionally, in such a connecting portion of the electric wiring, as shown in FIG. 6, for example, a connecting lead wire 2 is connected to a basic lead wire 1 by a joint terminal 5. In this case, first, a part of the insulating coating of the basic lead wire 1 and the connecting lead wire 2 is removed, and then the basic core wire 3 and the connecting core wire 4 are connected to the joint terminal 5
After crimping with, the basic core wire 3, the connecting core wire 4 and the joint terminal 5 are wrapped with an insulating tape.

[0003]

However, according to the conventional lead wire connecting method, after connecting the basic lead wire 1 and the connecting lead wire 2, the tip 4a of the connecting core wire 4 is dislocated to the outside of the insulating tape. It may pop out and break through the insulation coating of other lead wires to cause a short circuit. Therefore, since the insulating tape is wound in three layers or the tip end portion 4a of the connection core wire 4 is soldered to prevent the tip end portion 4a of the connection core wire 4 from varying, the manufacturing cost of the electrical component tends to increase. There is.

The present invention has been made in order to solve the above problems, and prevents the core wires from coming apart after connecting the lead wires with an inexpensive structure, thereby making it difficult to short the lead wires. An object of the present invention is to provide a lead wire connecting method having high performance.

[0005]

A method of connecting lead wires according to the present invention for solving the above-mentioned problems is achieved by removing an insulating coating formed in a wiring intermediate portion of a first lead wire.
A step of forming an exposed portion on the first core wire of the first lead wire, and a state in which an insulating coating is left on the tip end portion of the second lead wire,
By removing the insulating coating on the rear part of the wiring at the tip,
Forming an exposed portion on the second core of the second lead wire; connecting the exposed portion of the first core and the second core with a joint terminal; exposing the first core and the second core And a step of coating the joint terminal with an insulating tape.

[0006]

According to the lead wire connecting method of the present invention, since the insulating coating is left on the tip portion of the second lead wire after the connection of the first lead wire and the second lead wire, the tip portion of the second core wire is disjointed. Prevents kicking.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a wiring branch portion (intermediate joint) of a wire harness used for electric wiring of an automobile or the like. FIG. 3 shows the basic lead wire 10, and FIG. 4 shows the connecting lead wire 20 connected to the basic lead wire 10.

Basic lead wire 10 and connecting lead wire 20
Insulating coatings 12 and 22 made of vinyl, rubber or the like are formed on the basic core wire 11 and the connection core wire 21. The basic core wire 11 and the connection core wire 21 are bundled with copper wires 13 and 23. The number of wires and the wire diameter are set to predetermined values. Next, a method of connecting the connection lead wire 20 to the basic lead wire 10 will be described.

First, as shown in FIG. 3 (a), ring-shaped cuts 14 are made in the insulating coating 12 of the basic lead wire 10 at two positions at predetermined intervals. Then, a linear cut 15 parallel to the basic lead wire 10 is made so as to connect these ring-shaped cuts 14. As a result, the insulating coating 12a between the ring-shaped notches 14 is easily peeled off. After the insulation coating 12a is stripped off, the exposed portion 11a of the basic core wire 11 is formed on the basic lead wire 10 as shown in FIG. 3B.

As shown in FIG. 4A, the connecting lead wire 2
At 0, one ring-shaped notch 24 is made at a position behind the tip portion 20a by a predetermined distance L1. Then, the insulating coating end portion 22a is relatively moved in the arrow direction shown in FIG. The moving distance L ₂ of the insulating coating end 22a is smaller than the length L ₁ of the insulating coating end 22a in the wiring direction,
The distance should be as large as possible for caulking described below. As a result, the exposed portion 21b is formed on the connection lead wire 20 with the insulating coating end portion 22a left on the connection core wire tip portion 21a.

Incisions 14, 1 in insulating coatings 12 and 22
When inserting 5 and 24, an automatic cutting device capable of setting a desired cutting position may be used. When this automatic cutting device is used, it is possible to continuously form the exposed portion 11a and the exposed portion 21b having a constant interval. Next, as shown in FIG. 5, the basic core wire 11 and the connection core wire 21 are caulked by the joint terminal 25. The joint terminal 25 is
As shown in FIGS. 1 and 2, both end portions 25a are folded back to the central portion to bundle the basic core wire 11 and the connection core wire 21. Then, the basic lead wire 10 and the connection lead wire 20 are connected. After that, the basic core wire 11 and the connection core wire 2
Insulating tape 26 is wrapped around 1 and joint terminal 25.
In this case, the insulating tape 26 is wound so as to cover the cut portions 12b and 22b of the insulating coatings 12 and 22.

After connection, the core wire tip portion 2 of the connection lead wire 20
Since 1a is covered with the insulating coating end 22a, the core wire tip 21a is unlikely to come apart. For this reason, it is not necessary to wrap the insulating tape 26 over several times, and it is not necessary to perform processing such as soldering on the core wire tip portion 21a. Further, the core wire tip portion 21a does not break through the insulating coating of the other lead wires.

In this embodiment, the exposed portion 21 is formed on the connection core wire 21.
When forming b, as shown in FIG.
4 is formed, the insulating coating end 22a is connected to the lead wire 20.
However, as another embodiment of the present invention, it is also possible to make notches at two positions behind the connecting core wire distal end portion 21a to remove the insulating coating. In this case, since the insulating coating end portion 22a becomes relatively short, the lead wire can be easily handled.

[0014]

As described above, according to the lead wire connecting method of the present invention, in order to prevent the core wire from becoming loose due to the insulation coating on the tip portion of the lead wire, the insulating tape is wound a plurality of times or the core wire is wound. Since the number of turns of taping can be reduced without soldering the tip portion, there is an effect that the lead wire can be reliably connected at a relatively low cost.

[Brief description of drawings]

FIG. 1 is a schematic view showing a connecting portion of a lead wire according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of the connecting portion of the lead wire shown in FIG.

FIG. 3 is a schematic diagram for explaining a method of removing an insulating coating on a middle portion of a lead wire according to an embodiment of the present invention.

FIG. 4 is a schematic diagram for explaining a method of removing an insulating coating on the rear of the tip end portion of a lead wire according to an embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining a lead wire connecting method according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing a conventional connecting portion of a lead wire.

[Explanation of symbols]

 10 basic lead wire (first lead wire) 11 first core wire 11a, 21b exposed part 12, 22 insulating coating 20 connection lead wire (second lead wire) 21 second core wire 22a insulating coating end portion (tip portion) 25 joint terminal 26 insulating tape

Claims (1)

Claim: What is claimed is: 1. A step of forming an exposed portion on a first core wire of the first lead wire by removing an insulating coating formed on a wiring intermediate portion of the first lead wire, A step of forming an exposed portion on the second core wire of the second lead wire by removing the insulating coating on the rear portion of the wiring at the tip portion while leaving the insulating coating on the tip portion of the two lead wires; A step of connecting the exposed parts of the first core wire and the second core wire with a joint terminal; and a step of covering the exposed parts of the first core wire and the second core wire and the joint terminal with an insulating tape. How to connect the lead wire.