JPS62198007A - Wiring harness - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a wire harness used for electrical wiring in refrigerators, air conditioners, automobiles, etc.

2. Description of the Related Art An example of a conventional wire harness used in the above-mentioned products will be described below with reference to the drawings.

4 to 6 show the structure of a conventional wire harness. In FIG. 4, 1 is a wire harness. 2 is an electric wire coated with insulation such as vinyl chloride resin or enamel paint. Connectors 3 and 4 are used to connect the wire harnesses 1 to each other or to connect the wire harness 1 to a switch or the like.

6 is a foam.

The foam 6 is formed into a tape shape by applying an adhesive to one side of a foam-molded resin sheet, and is wound around the electric wire 2 as shown in FIG.

For example, as shown in FIG. 6, the foam body 6 is used when the wire harness 1 is passed through a hole made in the molded body 6 of metal, resin, etc.
It acts as a buffer material to prevent the electric wire 2 from being damaged by the end face of the hole, and also as a waterproof material. Furthermore, when a foamed heat insulating material such as foamed urethane is foamed on-site, as in the case of a refrigerator, the foam 6 acts as a sealing material to prevent foamed urethane from leaking from the holes.

Problems to be Solved by the Invention However, in the above configuration, the foam 6 is connected to the electric wire 2.
There was a problem in that a slight gap was created around the electric wire 2 when it was wound around the electric wire 2, which impeded the waterproofness and sealability.

Furthermore, it is difficult at present to perform the work of wrapping the foam 5 around the electric wire 2 in multiple layers using an automatic machine, and the work must be done manually, which poses a problem of increasing the number of work steps.

In view of the above problems, the present invention completely eliminates even the slightest gap between the foam (foam 6 in the conventional example) and the electric wire, improves waterproofness and sealing performance, and reduces the number of man-hours in manufacturing wire harnesses. This is a significant reduction.

Means for solving the problems The technical means of the present invention for solving the above problems are as follows:
A wire harness is formed by integrally foaming a portion of an electric wire with a foam so that the foam adheres to the electric wire.

For production The effect of this technical means is as follows.

That is, since the foam is attached to the electric wire by integrally foaming with the electric wire, the electric wire and the foam are in close contact with each other, and there is no gap at all, so that the waterproof and sealing properties are perfect. Additionally, the work of wrapping the foam around the electric wires is no longer necessary, and the process of attaching the foam to the electric wires can be done using an automatic machine, making it possible to significantly reduce the number of man-hours needed to manufacture wire harnesses. be.

EXAMPLE Hereinafter, a wire harness according to an example of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, 7 is a wire harness with a foam 9 attached to an electric wire 8.
is foamed and removed.

FIG. 1 shows the attachment of the foam 9, which has been integrally foamed onto the wire 8 without a mold defining the size and shape of the foam 9.

Next, the operation of the configuration of this embodiment will be explained. The foam 9 is made of a reactive resin such as urethane. First, when the undiluted solution of the foam 9 is applied around a part of the electric wire 8, the undiluted solution of the foam 9 starts to react, foams, expands, and hardens, forming the foam 9 that completely covers the periphery of the electric wire 8.
form.

As described above, according to this embodiment, by attaching the foam 9 to the electric wire 8 by integrally foaming, the area around the electric wire 8 can be covered with the foam 9 without any gaps, resulting in perfect sealing and waterproofing. You can get sex. Further, since it is only necessary to apply the undiluted solution of the foam 9 around the electric wire 80, the foam 9 can be attached to the electric wire 8 using an automatic machine, and the number of man-hours for manufacturing the wire harness 7 can be significantly reduced. Furthermore, unlike conventional foams that are coated with an adhesive and processed into tape shapes by being slit, the resin used as the raw material for the foam 9 can be used as desired, reducing material costs.

A second embodiment of the present invention will be described below with reference to FIG.

In this embodiment, the foam 9' is integrally foamed with the electric wire 8' inside a mold 1o that defines the size and shape of the foam 9', and the foam 9' is attached to the electric wire 8'.

The operation of the configuration of the above embodiment will be explained. The material of the foam 9' may be a reactive resin such as urethane or a thermoplastic resin such as polyethylene containing a foaming agent. Electric wire 8' and foam 9 are placed in a preheated mold 10.
Add the undiluted solution of ' or unfoamed beads as raw material in the case of thermoplastic resin, tighten the mold 1o, and then insert the electric wire 8' in the mold 1o.
By foaming integrally with the electric wire 8', a foamed body 9' having a constant size and shape is formed, which tightly covers the electric wire 8'.

As described above, according to this embodiment, the foam 9' is attached to the electric wire 8'.
Since the electric wire 8' is attached by integrally foaming inside the mold 1o, the electric wire 8' can be covered with the foam 9' without any gaps at all, as in the first embodiment. In addition, since foaming occurs inside the mold 1o, the material for the foam can be not only reactive resins such as urethane, but also polyethylene or EVA containing a foaming agent.

Thermoplastic resins such as polystyrene can be used.

Furthermore, since the size and shape of the foam 9' are stable, even if a hard foam 9' is used, when the wire 7 is passed through a hole in a metal or resin molded body, the foam 9' This allows the hole to be completely covered, resulting in complete sealing and waterproofing.

Effects of the Invention As described above, the present invention is a wire harness characterized by attaching a foam to a portion of a covered electric wire by integrally foaming the wire, and has the following effects.

(1) Due to integral foaming, the foam adheres closely to the electric wire, so
There are no gaps around the wires, making it completely waterproof and sealable.

? ) All you have to do is apply the foam concentrate around the electric wire, or put the electric wire and the foam raw material (foam concentrate or unfoamed beads, etc.) into the mold and foam it together with the electric wire. °Since the installation work becomes simple and can be automated, it is possible to significantly reduce the number of man-hours for wire harness manufacturing.

(3) In addition, whereas conventional foams were coated with adhesives and agents and then slit and processed into tapes, it is possible to use the foam undiluted solution or raw material resin as is.
This also has the effect of reducing material costs.

[Brief explanation of drawings]

Fig. 1 is an enlarged perspective view of the foam attachment part of the wire 7-nes of the first embodiment of the present invention, Fig. 2 is a plan view of the same wire harness, and Fig. 3 is the second embodiment of the present invention. Figure 4 is a plan view of the conventional wire harness, Figure 6 is an enlarged perspective view of the foam attachment part of the wire harness, Figure 6 is the same wire harness. FIG. 3 is a partial cross-sectional view of an example in which the hole is sealed at the foam attachment portion of FIG. 7...Wire harness, 8.8'...
・Electric wire, 9.9'...Foam, 10...
・Type. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 6

Claims (3)

[Claims] (1) A wire harness comprising an electrical wire coated with insulation and a foam that is integrally foamed with the electrical wire and is in close contact with the electrical wire. (2) The wire harness according to claim 1, wherein the foam is formed in a mold that defines the size and shape of the foam. (3) The wire harness according to claim 1, wherein the foam is formed by foaming without using a mold.