JPH0870528A - Splice structure for wire harness - Google Patents

Abstract

PURPOSE: To make it possible to definitely insulate and protect welds and exposed core wires even if a tearing force is applied to an electric wire constituting a splice structure. CONSTITUTION: A welded portion 14 for core wires 11b, 12b and 13b of electric wires 11, 12 and 13 to be connected together and core wires exposed from insulation covers 11a, 12a and 13a are covered with insulating and protecting tape 15. At the place a predetermined distance away from the insulating and protecting tape, a binding tape 17 is wound around a plurality of electric wires 12 and 13 branched the welded portion thereby connecting together a plurality of electric wires.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a splice structure for a wire harness in which the core wires are exposed by peeling off the insulating coating of the wires which are connected to each other among the wires constituting the wire harness and the exposed core wires are joined. And in particular to the insulation and protection of such splice structures.

[0002]

2. Description of the Related Art Conventionally, various splice structures for wire harnesses have been proposed, such as a splice structure in which core wires are connected by pressure contact terminals for intermediate connection and a splice structure in which core wires are welded. For example, as shown in FIGS. 4 (A) and 4 (B), core wires 1a and 2 of electric wires 1, 2 and 3 which are connected to each other.
A splice structure in which a and 3a are joined by ultrasonic welding has been proposed. In this splice structure, an adhesive tape 5 made of an insulating material such as polyvinyl chloride (PVC) is wound around the welded portion 6 and the exposed core wires 1a to 3a to cover these portions.

[0003]

When a wire harness is manufactured, wires are usually routed on an assembly drawing board on which a large number of jigs are projected, and the splice structure is provided from this assembly drawing board. When removing the wires 1, 2, 3
The wires 2 and 3 are caught in a jig or the like, and as shown by an arrow P, a force (tearing force) in a direction for separating the wires 2 and 3 from the welding portion 6 is applied to the wires 2 and 3. There are cases. When the tearing force P exceeds a certain level (about 98 N when the adhesive tape 5 is made of PVC), the adhesive tape 5 is stretched or the position of the adhesive tape 5 is displaced as shown in FIG. Or adhesive tape 5
May peel off from the welded portion 6 and the exposed core wires 1a, 2a, 3a. If the welded portion 6 is exposed or the joints of the core wires 1a, 2a, 3a are broken due to the displacement of the adhesive tape 5 or the like, the electrical components (not shown) connected to the electric wires 1, 2, 3 will not function. It may cause operation.

The present invention has been made in order to solve the above-mentioned problems in the conventional splice structure, and it is necessary to reliably insulate and protect the welded portion and the exposed core wire even when a tearing force is applied to the electric wire. It was done for the purpose.

[0005]

Therefore, according to a first aspect of the present invention, a welding portion in which core wires of electric wires to be connected to each other are welded and a core wire exposed from an insulating coating are covered with an insulating / protecting tape, and the insulating / protecting tape is used. A splicing structure for a wire harness, characterized in that a plurality of electric wires branched from the welding portion are wound with a binding tape at a position spaced apart from the tape by a predetermined distance to bind the plurality of electric wires. It is a thing. The welded portion preferably welds the core wire by ultrasonic welding (claim 2).

[0006]

In the splice structure of the wire harness according to the first aspect of the invention, the binding tape is wound around the plurality of electric wires branched from the welding portion at a position separated from the insulating / protecting tape by a predetermined distance, and the plurality of electric wires are wound. Since the wires are bundled together, if a force (tearing force) that separates these wires from each other is applied to the above-mentioned branched wires, a tearing force will be applied to the binding tape, but insulation and protection Almost no tearing force acts on the tape. In addition, even if the binding tape is displaced due to the tearing force, the insulating / protecting tape and the binding tape do not come into contact with each other.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in the drawings. As shown in FIG. 1, in the splice structure according to the embodiment of the present invention, the insulating coatings 11a, 11a on the tips of the three electric wires 11, 12, 13 connected to each other are provided.
12a and 13a are peeled off to expose the exposed core wires 11b and 12
The welded portions 14 are provided by joining b and 13b by ultrasonic welding. In the present embodiment, the three electric wires 11, 12,
Of the 13 wires, one of the electric wires 11 has an exposed core wire 11 b, and the other of the two electric wires 12, 13 has an exposed core wire 12 b.
b and 13b are arranged so as to face each other and are welded, and these two electric wires 12 and 13 are bifurcated from the welded portion 14.

The welded portion 14, the core wires 11b, 12b, 13b exposed from the insulating coating and the exposed core wire 11
The insulating coatings 11a, 12a, 13b near b to 13b are covered with an insulating / protective tape 15. The insulating / protecting tape 15 is an adhesive tape made of an insulating material such as PVC having an adhesive layer on one surface, and is wound so that the adhesive layer is on the side of the above-mentioned covered portion. By covering the welded portion 14 and the exposed core wires 11b to 13b with the insulating / protecting tape 15 in this manner, these portions are insulated and protected.

Electric wires 12, 1 branched from the welded portion 14
On the third side, the electric wires 12 and 13 are bundled and separated from the insulating / protecting tape 15 by a predetermined distance L.
A binding tape 17 made of an adhesive tape is wound around the outer circumference of the wire 3 to bind the electric wires 12 and 13. The tying tape 17 is an adhesive tape made of an insulating material such as PVC having an adhesive layer on one surface, and the adhesive layer has electric wires 12, 1
3 is wound so as to come to the side of the insulating coatings 12a and 13a. The binding tape 17 is preferably the same adhesive tape as the insulating / protecting tape 15,
In this case, one kind of adhesive tape is used as insulation / protection tape 1
Since it can be used as 5 or as the binding tape 17,
The cost required to form the splice structure can be reduced.

The distance L between the insulating / protecting tape 15 and the tying tape 17 is determined by the tying tape 1 as described later.
It is preferable to set it to about 100 mm in consideration of the case where the position of 7 is displaced. However, this distance L is not always 1
It is not necessary to make it about 00 mm, and the electric wires 11, 12, 13
Can be appropriately set according to the diameter of the wire, the distance from the welded portion 14 to the tips of the electric wires 11, 12, 13 and the material of the binding tape.

When a force (tearing force P) for separating the electric wires 12, 13 from each other is applied to the branched electric wires 12, 13, as shown in FIG. The tearing force P acts to cause elongation, displacement, peeling, etc., but the tearing force P hardly acts on the insulating / protecting tape 15. Further, since the insulating / protecting tape 15 and the bundling tape 17 are separated by the distance L as described above, even if the position of the bundling tape 17 is displaced by the tearing force P, the insulating / protective tape 1
5 and the binding tape 17 do not contact. Therefore, in the splice structure of the present embodiment, even when the tearing force P acts, the insulating / protecting tape 15 does not stretch, shift, peel off, etc., and the insulating / protective tape 15 does not have the welded portion 14. The core wires 11b, 12b, 13b that have been exposed or exposed are reliably held in a state of being covered.

When forming the splice structure according to this embodiment, first, as shown in FIG.
The insulation coatings 11a, 12a, 13a of 1, 12, 13 are peeled off to expose the core wires 11b, 12b, 13b. Next, as shown in FIG. 3B, the exposed core wires 11b, 12b, 13b are welded using an ultrasonic welding machine. Next, as shown in FIG. 3C, the welded portion 14 and the insulating coating 1
Core wires 11b, 12 exposed from 1a, 12a, 13a
b, 13b and the insulating coatings 11a, 12a, 13a near the exposed cores 11b to 13b are insulated and protected with a tape 15
Cover with. Further, as shown in FIG. 3 (D), the electric wires 12 and 13 are bundled at a position separated from the insulating / protecting tape 15 by a predetermined distance, and the binding tape 17 is wound around the splicing tape 17 as shown in FIG. The structure is completed.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above embodiment, the core wire is welded by ultrasonic welding. The core wire may be welded by. Further, in the above embodiment, three electric wires are welded and two of the electric wires are branched into two forks from the welded portion, but the number of electric wires to be connected is not limited to this, and the welded portion is not limited thereto. From 2
When more than one electric wire is branched, a tying tape may be wound around these electric wires for bundling.

[0014]

As is apparent from the above description, the splicing structure for the wire harness according to the first aspect of the present invention provides insulation and
At a position separated from the protective tape by a predetermined distance, the binding tape is wound around a plurality of electric wires branched from the welded portion, and since the plurality of electric wires are bound, with respect to the plurality of branched electric wires, When a tearing force acts, this tearing force acts on the bundling tape, but it hardly acts on the insulating / protecting tape, and even if the above bundling tape is displaced, it does not come in contact with the insulating / protecting tape. do not do. for that reason,
With this splice structure, the insulation and
Prevents expansion, slippage, and peeling of the protective tape, and
The protective tape can be reliably maintained in a state where the welded portion and the exposed core wire are covered, the welded portion is not exposed, the core wire joint is not broken, etc. It is possible to prevent the occurrence of defects.

[Brief description of drawings]

FIG. 1A is a schematic view showing a splice structure according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along line I-I of FIG.

FIG. 2 is a schematic view showing a case where a tearing force acts on the splice structure according to the embodiment.

3 (A), (B), (C) and (D) are schematic perspective views showing a forming operation of a splice structure.

4A is a schematic view showing an example of a conventional splice structure, and FIG. 4B is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a schematic view showing a case where a tearing force acts on a conventional splice structure.

[Explanation of symbols]

 11,12,13 Electric wire 11a, 12a, 13a Insulation coating 11b, 12b, 13b Core wire 14 Welding part 15 Insulation / protection tape 17 Bundling tape

Claims (2)

[Claims] 1. A welding portion, in which core wires of electric wires to be connected to each other are welded, and a core wire exposed from an insulating coating are covered with an insulating / protecting tape, and at a position separated from the insulating / protecting tape by a predetermined distance. A splicing structure for a wire harness, characterized in that a plurality of electric wires branched from the welded portion are wrapped with a binding tape to bind the plurality of electric wires. 2. The splice structure for a wire harness according to claim 1, wherein the welded portion welds the core wire by ultrasonic welding.