JPH0870526A - Splice structure of wire harness - Google Patents

Abstract

PURPOSE: To make it possible to definitely insulate and protect welds and exposed core wires when a tearing force is applied to an electric wire constituting a splice structure or a splice construction collides with an edge portion. CONSTITUTION: Insulation covers 11a, 12a and 13a are peeled off from electric wires 11, 12 and 13 to be connected together, core wires 11b, 12b and 13b are exposed, and the exposed core wires are welded to make welded portions 14. The welded portions and core wires exposed from insulation covers are covered with insulating and protecting tapes 16 consisting of adhesive tapes reinforced with fibers. The insulating and protecting tape has fibers laid out in grid pattern on an adhesive layer applied to the surface of a sheet.

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 and connected. For example, in FIG.
As shown in (B), there has been proposed a splice structure in which core wires 1a, 2a, 3a of electric wires 1, 2, 3 connected to each other are joined by ultrasonic welding. In this splice structure, an adhesive tape 5 made of an insulating material such as polyvinyl chloride (PVC) is attached to the welded portion 6 and the exposed core wires 1a to 3a.
It is wound three times to cover these parts.

[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 PVC), the adhesive tape 5 is stretched or the position of the adhesive tape 5 is displaced as shown in FIG. Alternatively, the adhesive tape 5 may be peeled off from the welded portion 6 or the exposed core wires 1a, 2a, 3a.

Further, as shown in FIG. 9, when the portion of the splice structure collides with a sharp spot (edge portion E) such as a spot welding burr existing on a steel plate of a vehicle or an end portion of the steel plate, the adhesive tape 5 May be torn.

When the welded portion 6 is exposed or the joints of the core wires 1, 2, 3 are broken due to the displacement or breakage of the adhesive tape 5, electrical components connected to the electric wires 1, 2, 3 ( (Not shown) may cause a malfunction of the function.

The present invention has been made in order to solve the problems in the above-mentioned conventional splice structure, and even when a tearing force is applied to an electric wire or when it collides with an edge portion,
The purpose is to reliably insulate and protect the welded portion and the core wire.

[0007]

Therefore, according to a first aspect of the present invention, the insulation coating of the electric wires to be connected to each other is peeled off to expose the core wire, and the exposed core wire is welded to provide a welded portion. The present invention provides a splice structure for a wire harness in which a core wire exposed from an insulating coating is covered with an insulating / protective tape made of an adhesive tape containing fibers.

A second aspect of the present invention is the splice structure of a wire harness according to the first aspect, wherein the insulating / protecting tape comprises fibers arranged in a lattice on a sheet provided with an adhesive layer. Is provided.

According to a third aspect of the present invention, in the splice structure for a wire harness according to the first aspect, the insulating / protecting tape is formed by arranging fibers in a striped pattern on a sheet provided with an adhesive layer. Is provided.

[0010]

In the wire harness splice structure according to claim 1, since the adhesive tape containing fibers is used as the insulating / protecting tape for covering the welded portion and the core wire exposed from the insulating coating, Even when a force (tearing force) that separates these wires from each other is applied to a plurality of branched wires, the insulation / protection tape will
Stretching, misalignment, tearing, etc. do not occur easily.

Further, in the splice structure according to the first aspect, when the burr of spot welding or an edge portion such as an end portion of a steel sheet collides, the insulating / protective tape made of the fiber-containing adhesive tape is not easily pierced.

Further, according to the second aspect, since the fibers are arranged in a lattice pattern, the tension due to the above-mentioned tearing force acts on the fibers in both the longitudinal and lateral directions substantially evenly and can withstand a large tearing force.

Further, according to claim 3, since the fibers are arranged in a striped pattern, if the insulating / protecting tape is covered in a direction in which the extending directions of the fibers and the electric wire are orthogonal to each other, the above-mentioned tearing force is applied to the longitudinal direction of the fibers. The insulating / protective tape can withstand a large tearing force because it acts in a direction substantially equal to the direction and the tearing force acts as a force to pull each fiber.

[0014]

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, 12 are provided at the tips of the three electric wires 11, 12, 13 that are connected to each other.
a, 13a is peeled off to expose the core wires 11b, 12b, 13b. The exposed core wires 11b, 12b, 1
A welded portion 14 is provided by joining 3b by ultrasonic welding.

Of the above three electric wires 11, 12, 13
The exposed core wires 11b of one electric wire 11 are arranged and welded so that the exposed core wires 12b and 13b of the remaining two electric wires 12 and 13 face each other and are welded to each other.
2, 13 are bifurcated from the welded portion 14. The welded portion 14, the core wires 11b, 12b, 13b exposed from the insulating coatings 11a, 12a, 13a, and the exposed core wire 1
Insulating coatings 11a, 12a near 1b, 12b, 13b,
13a is covered with an insulating / protective tape 16, and the welding portion 14
Also, the core wires 11b, 12b, 13b exposed from the insulating coatings 11a, 12a, 13a are protected.

This insulation / protection tape 16 is shown in FIG.
As shown in (A) and (B), a layer of adhesive 18 is provided on one surface 17a of the resin film 17, and fibers 20 are arranged in the layer of adhesive 18 It is an adhesive tape. The film 17 is made of, for example, a resin such as PVC, and the surface 17b on the other side is coated with fluorine or the like so that the pressure-sensitive adhesive 18 does not stick to it, and is subjected to a mold release process. The pressure-sensitive adhesive 18 is a rubber-based or acrylic-based pressure-sensitive adhesive. For example, when the film 17 is made of PVC, it is an acrylic-based pressure-sensitive adhesive. The fibers 20 are various fibers such as polyester fibers, glass fibers and carbon fibers. In this embodiment, the fiber 20 of the insulating / protective tape 16 is used.
Is knitted so that the longitudinal fibers 20-1 and the transverse fibers 20-2 are orthogonal to each other. The adhesive 18 is a rubber-based, acrylic-based adhesive or the like. An example of this type of fiber-containing adhesive tape is Sriron Tech # 951.
There are 0 (brand name) etc. The insulation / protection tape 16 made of this fiber-containing adhesive tape is made of only conventional PVC, etc., and has strength against pulling and resistance to breakage when colliding with a sharp part, as compared with an adhesive tape without reinforcing fibers. Both are expensive.

The insulating / protecting tape 16 is attached so that the surfaces on the side where the layer of the adhesive 18 is provided face each other. The longitudinal fibers 20-
1 and the lateral fibers 20-2 are both electric wires 11, 12, 1
3 with respect to the extending direction (indicated by the one-dot chain line X in the figure).

In the splice structure of this embodiment, FIG.
When a force (tearing force P) in the direction separating the electric wires 12, 13 from each other acts on the branched electric wires 12, 13 as shown in FIG. Since the strength of the adhesive tape is higher than that of a pressure-sensitive adhesive tape not provided with the conventional adhesive tape, even if the conventional adhesive tape has a tearing force, the insulating / protective tape 16 will not be stretched, displaced, or peeled off. . Particularly, in this embodiment, the longitudinal fibers 20-1 and the transverse fibers 20-2 form an angle of about 45 ° with respect to the extending direction X of the electric wires 11, 12, 13 as described above. Since they are arranged, the tension due to the tearing force P causes the fibers 20-1 and 20-2 in both the vertical and horizontal directions.
Since it acts almost evenly on 0-2, it can withstand a large tearing force P. As described above, in the splice structure of the present embodiment, even when the above-mentioned tearing force P acts, the insulating / protecting tape 16 is prevented from stretching, slipping, peeling, etc. The core wires 11b, 12b, 13b that have been exposed or exposed are reliably held in a state of being covered.

Further, in the splice structure of the present embodiment, the welded portion 14 and the exposed core wires 11b, 12b, 13b are spot-welded burrs and steel plates present on the steel plate of a vehicle rather than the conventional adhesive tape made of PVC or the like. When it collides with the edge portion E such as the end portion of the sheet, since it is covered with the insulating / protection tape 16 made of a fiber-containing adhesive tape having high strength, the collision with the edge portion E causes the insulation / protection tape 16
Is hard to break through. Therefore, in this embodiment, even when the edge portion E collides, the welded portion 14 and the exposed core wire 1
1b, 12b and 13b are securely held in a state of being covered with the insulating / protecting tape 16.

When forming the splice structure according to the present 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. 4B, the exposed core wires 11b, 12b, 13b are welded using an ultrasonic welding machine. Next, as shown in FIG. 4C, the welded portion 14 and the insulating coating 1
Core wires 11b, 12 exposed from 1a, 12a, 13a
b, 13b and the exposed insulating coatings 11a, 12a, 13a in the vicinity of the exposed core wires 11b, 12b, 13b are coated with an insulating / protecting tape 16 to complete the splice structure as shown in FIG.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above embodiment, the fibers 20 of the insulating / protective tape are arranged in a grid pattern, but as shown in FIG.
The insulating / protective tape 16 'may be used from the fiber-containing adhesive tape on which is arranged. In this case, the fiber 20 and the electric wire 1
It is preferable to wind the insulating / protecting tape 16 ′ so that the extending directions X of 1, 12, 13 are orthogonal to each other. By arranging the insulating / protecting tape 16 ′ in this way, the tearing force P acts in a direction substantially equal to the longitudinal direction of the fibers 20, and the tearing force P acts as a force for pulling each fiber 20. The protective tape 16 'can withstand a large tearing force.

[0022]

Experimental Example An experiment was conducted to confirm the effect of the present invention. In this experiment, the durability of the splice structure according to the present invention with respect to the tearing force (tearing strength) was examined. As a comparative example, the tear strength of the conventional splice structure was also examined.

As the above-mentioned splice structure (experimental example) of the present invention, as the above-mentioned pressure-sensitive adhesive tape containing reinforcing fibers, polyester fibers are knitted in a lattice form on a resin sheet and an acrylic adhesive layer is provided. It was used. In the comparative example, a PVC adhesive tape was used as an insulating / protecting tape.

The experimental apparatus is as shown in FIG. 6, and the chuck 25 for fixing one of the electric wires 12 constituting the splice structure and the electric lifting device 26 are fixed on the table. The electric lifting device 26 includes a rod 27 that can be lifted and lowered at a desired speed. A push-pull cage 29 is attached to the rod 27 via an arm 28, and a chuck 30 for fixing another electric wire 13 constituting the splice structure is attached to the tip of the push-pull cage 29.

In this experiment, one electric wire 12 of the splice structure to be tested is fixed to the chuck 25, while the other electric wire 13 is fixed to the chuck 30, and the rod of the electric lifting device 26 is raised at 30 mm / sec. . The tear strength is the reading of the push-pull cage 29 when the welded portion 14 is broken in the sample splice structure.

Table 1 shows the results of measuring the tear strength 10 times for the above-mentioned experimental examples and comparative examples.
The average value of ten tear strength measurements when the welded portion 14 and the exposed core wire 11 were not covered with an adhesive tape was 3.21 kg.

[0027]

[Table 1]

As shown in Table 1 above, in the splice structure of the experimental example using the fiber-containing adhesive tape, the average tear strength was 6.00 kgf, whereas the fiber-containing adhesive tape was not used in the comparative example. Then, the average tear strength is 3.05 kgf, and it can be confirmed that the present invention has high tear strength.

[0029]

As is apparent from the above description, in the splice structure of the wire harness according to the first aspect, as the insulating / protecting tape for covering the welded portion and the core wire exposed from the insulating coating, the adhesive tape containing fibers is used. Since tape is used, even if a force (tearing force) that separates these wires from each other is applied to multiple wires that branch from the welded part, the insulation / protection tape will not stretch. , Slippage, tearing, etc. are unlikely to occur. Further, in the splice structure according to claim 1, since the adhesive tape containing fibers is used as the insulating / protecting tape as described above, spot welding burrs,
The insulating / protective tape is not easily pierced even if it collides with the edge of the steel plate. Therefore, in the splice structure according to the first aspect, the insulating / protecting tape can be reliably maintained in a state of covering the welded portion and the exposed core wire, and the welded portion is exposed, the core wire is broken, or the like. Therefore, it is possible to prevent the occurrence of a malfunction such as a malfunction of the electrical component.

According to the second aspect, since the fibers are arranged in a lattice pattern, the tension due to the tearing force acts on the fibers in both longitudinal and transverse directions almost uniformly, and a large tearing force can be endured.

Further, in the third aspect, since the fibers are arranged in a striped pattern, if the insulating / protecting tape is covered in a direction in which the extending directions of the fibers and the electric wire are orthogonal to each other, the above-mentioned tearing force can be obtained in the longitudinal direction of the fibers. Since the tearing force acts in a direction substantially equal to the direction and the tearing force acts as a force to pull each fiber, the insulating / protective tape can withstand a large tearing force.

[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. 2A is a schematic view of a fiber-containing sheet, and FIG. 2B is a sectional view taken along line II-II of FIG.

FIG. 3 is a schematic diagram for explaining the operation of the embodiment.

4 (A), (B), and (C) are schematic views showing a forming operation of a splice structure according to an embodiment.

FIG. 5 is a schematic diagram showing a modified example of the present invention.

FIG. 6 is a schematic view showing an experimental device.

FIG. 7A is a schematic view showing a conventional splice structure, and FIG. 7B is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a schematic view showing a problem of a conventional splice structure.

FIG. 9 is a schematic view showing a problem of 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 16, 16 'Insulation / protection tape 20 Fiber

Claims (3)

[Claims] 1. A core wire is exposed by peeling off an insulation coating of electric wires to be connected to each other, and the exposed core wire is welded to provide a welding portion, and the welding portion and the core wire exposed from the insulation coating are filled with fibers. A wire harness splice structure covered with an insulating / protective tape made of adhesive tape. 2. The splicing structure for the wire harness according to claim 1, wherein the insulating / protecting tape comprises fibers arranged in a lattice on a sheet provided with an adhesive layer. 3. The splice structure for a wire harness according to claim 1, wherein the insulating / protecting tape is formed by arranging fibers in stripes on a sheet provided with an adhesive layer.