JP2009099451A - Inter-wire water cutoff method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inter-wire water cutoff method capable of improving productivity by realizing simplification of working process and shortening working time. <P>SOLUTION: The inter-wire water cutoff method comprises: a tube installation step in which a bottomed cylindrical tube 82 is covered on the end part of a coated electric wire 72, so that a conductor connection portion 72 in which core wires 75 exposed from the insulating coating 77 of the coated electric wire 72 may be covered at the end part of a plurality of coated electric wires 72 arranged in parallel; a tube fusion bonding step in which supersonic vibration is applied to the tube 82 and the tube is fusion bonded to the insulating coating 77 of the coated electric wire 72; and a water cutoff agent filling step to fill the water cutoff agent S in the tube 82. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a line water-stopping method used for water-stopping between core wires of a covered wire of a wire harness (Note that “water-stop” in the description of the present invention is not limited to preventing water from entering. , Water, oil, alcohol, etc., it works effectively in general, but here it will be described using “water stoppage” which is widely used as a name).

  Many wire harnesses are used in vehicles such as automobiles, and some of these wire harnesses may be provided with bonders. Briefly describing this bonder, a wire connecting portion formed by electrically connecting the conductors at one end of the bundle of covered wires to one end of the bundle of covered wires so as to cover the wire connecting portion. A portion of the wire harness provided with the insulation protection member provided.

  More specifically, the bonder is formed by electrically connecting conductors exposed at one end portions of a plurality of covered electric wires that are aligned and bundled in the same direction to each other by an appropriate joining means. An insulating protective member having a hollow cylindrical portion having at least one end opened, such as an insulating resin tube, an insulating resin cap, an insulating resin cover, or the like, is formed in the conductor connection portion (that is, the electric wire connection portion) of the bundle of electric wires. Is a portion covered to protect and protect the wire connection portion of the covered wire (see, for example, Patent Documents 1 to 5).

  Note that the wire connecting portion of the electric wire to which the insulating protection member is attached is called “bonder” or “splice (splice portion)” as described above, particularly in the automobile-related industry.

  Bonders are often fixed in electrical junction boxes (ie, electric junction blocks) such as relay boxes, fuse boxes, and the like.

  According to the techniques disclosed in Patent Documents 1 to 5, it is possible to satisfactorily protect the conductor connection portion of the bundle of covered electric wires that have been water-stopped by the insulating protective member. Accordingly, further simplification of the work process is desired.

JP-A-10-243539 JP 2005-5150 A JP 2005-228603 A JP 2005-102367 A JP 2006-81319 A

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a line water-stop method capable of simplifying a work process and shortening a work time and improving productivity. There is to do.

In order to achieve the above-described object, the line water stopping method according to the present invention is characterized by the following (1) to (3).
(1) The end of the covered electric wire has a bottom so that the end of the plurality of covered electric wires arranged in parallel covers the conductor connecting portion connecting the core wires exposed from the insulation coating of the covered electric wire. A tube mounting step for covering a tubular tube;
A tube fusion step of applying ultrasonic vibration to the tube and fusing it to the insulation coating of the covered electric wire;
A water-stopping material filling step of filling the tube with a water-stopping material;
Including.
(2) It is the line water stopping method of the above (1),
Use a waterstop material with thixotropic properties.
(3) The line water stopping method of (1) or (2) above,
A core wire connecting step of connecting the core wires to each other so that the conductor connecting portion has an uneven shape;

According to the line-water-stopping method of the above (1), the tube is placed on the conductor connection portion, ultrasonic vibration is applied and fused to the insulating coating of the covered electric wire, and the water-stopping material is filled in the tube. Further, it is possible to eliminate a complicated process such as immersing the conductor connecting portion in the water stop material stored in the storage tank or fixing the tube to the covered electric wire with the adhesive. That is, the work process can be simplified and the work time can be shortened to improve productivity.
According to the line water-stop method of (2) above, since a resin such as silicone having thixotropy is used as the water-stop material, the water-stop material smoothly penetrates between the core wires, and then the water-stop material. Can be surely retained between the core wires until it hardens, and a good water-stopping treatment can be obtained.
According to the line water stop method of the above (3), since the conductor connecting portion has an uneven shape, it is possible to increase the fixing force with the water stop material and maintain a good water stop state over a long period of time. .

  According to the present invention, the conductor connection portion is covered with a tube to impart ultrasonic vibration to be fused to the insulation coating of the covered electric wire, and the water stop material is filled in the tube. A complicated process of immersing the conductor connecting portion in the water material or fixing the tube to the covered electric wire with an adhesive can be eliminated. That is, the work process can be simplified and the work time can be shortened to improve productivity.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  Here, taking a wire harness bonder as an example, a water-stopping material is provided between the core wires from the conductor connection portion formed by electrically connecting the exposed portions of the core wires of the plurality of covered wires to the inside of the insulation coating. The water-stopping method of the present invention that permeates and protects the exposed portion of the core wire will be described.

  DESCRIPTION OF EMBODIMENTS An embodiment of a line water stopping method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a wire harness that performs a water stop treatment by a water stop method according to an embodiment of the present invention.

  As shown in FIG. 1, the wire harness 70 has a plurality of covered electric wires 72 arranged in parallel. A plurality of core wires 75 are partially exposed from the insulating coating 77 at the tip portions of the covered electric wires 72, and the exposed portions of the core wires 75 are electrically connected to each other, whereby the conductor connection portion 71 is formed. Is formed.

  Next, the case where the water stop process is performed to the conductor connection part 71 of the said wire harness 70 is demonstrated. FIGS. 2A to 2E are cross-sectional views illustrating steps of water stop treatment for the wire harness.

  First, as shown in FIG. 2A, the core wire 75 exposed from the insulation coating 77 of the plurality of covered electric wires 72 is heated and pressurized to be electrically connected to each other to form the conductor connection portion 71. To do.

  At this time, as shown in FIG. 3, the conductor connection portion 71 is formed into a concavo-convex shape by applying pressure with the pressing dies 81 a and 81 b.

  Next, as shown in FIG. 2B, a bottomed tubular tube 82 is placed on the tip of the covered electric wire 72 so that the conductor connecting portion 71 is covered. As a material for forming the tube 82, for example, an elastomer is suitable.

  Thus, when the conductor 82 is covered with the tube 82, as shown in FIG. 2C, ultrasonic vibration is applied to the vicinity of the opening edge of the tube 82, and the vicinity is insulated from the covered wire 72. The coating 77 is ultrasonically fused.

  Specifically, an ultrasonic vibrating body is pressed against the tube 82, and the tube 82 and the covered electric wire 77 are welded by frictional heat due to ultrasonic vibration.

  In this way, when a part of the tube 82 is fused to the insulating coating 77, the water-stopping material S is injected into the tube 82 by the water-stopping material injector 83 as shown in FIG. The water stop material injector 83 has a cylinder 84, a piston 85 slidably fitted to the cylinder 84, and an injection needle 86 provided at the tip of the cylinder 84.

  In order to inject the water-stopping material S into the tube 82 by the water-stopping material injector 83, the piston 85 is connected to the cylinder 84 with the injection needle 86 of the water-stopping material injector 83 being inserted into the bottom of the tube 82. Push in. In this way, the water stop material S filled in the cylinder 84 is sent out from the injection needle 86 into the tube 82.

  Here, as the water stop material S filled in the tube 82, a resin such as silicone having thixotropy is suitable.

  The thixotropy is a phenomenon in which the agglomerated component is destroyed and exhibits fluidity when agitated, but again agglomerates and becomes non-fluidized when agitation is stopped.

  As shown in FIG. 2E, when the tube 82 is filled with a predetermined amount of the water-stopping material S in the tube 82, the water-stopping material S adheres to the core wire 75 in the conductor connecting portion 71 and moves toward the rear end side. Then, it penetrates between the core wires 75 in the insulating coating 77, and after a while, the water-stopping material S aggregates into a non-flowing state and then hardens. As shown in FIG. 3, since the conductor connection portion 71 is formed in a concavo-convex shape in advance, the degree of adhesion of the water-stopping material S to the core wire 75 is improved, whereby the water-stopping material S penetrates between the core wires 75. It is easy to do.

  As a result, the wire harness 70 is water-stopped at the tip end by the water-stopping material S, and the conductor connection portion 71 is reliably covered and protected by the tube 82.

  As described above, according to the above embodiment, the tube 82 is placed on the conductor connection portion 71 to apply ultrasonic vibration to be fused to the insulating coating 77 of the covered electric wire 72, and the water stop material S is placed in the tube 82. Since it fills, the troublesome process of immersing the bonder in the water stop material stored in the storage tank or fixing the tube to the covered electric wire with the adhesive can be eliminated. That is, the work process can be simplified and the work time can be shortened to improve productivity.

  In addition, since a resin such as silicone having thixotropy is used as the water-stopping material S, the water-stopping material S smoothly penetrates between the core wires 75, and then between the core wires 75 until the water-stopping material S is cured. It can be made to stay reliably and a good water stop process can be obtained.

  Furthermore, since the conductor connection portion 71 has an uneven shape, it is possible to increase the fixing force with the water stop material S and maintain a good water stop state over a long period of time.

  Now, in order to explain the further superiority of the present invention, reference examples are shown in FIGS. 4 (a) to 4 (g) are diagrams showing the steps of the bonder water stopping method.

  First, as shown in FIG. 4 (a), the core wires 94 exposed from the insulating coating 93 at the tip ends of the plurality of covered electric wires 91 are heated and pressurized by the pressurizing dies 81a and 81b to be joined to each other. A conductor connecting portion 95 is formed.

  Next, as shown in FIG. 4B, the low-viscosity water stopping material S stored in the storage tank 96 includes the conductor connecting portion 95 and the covered electric wire 91 as shown in FIG. Immerse the tip.

  Thereafter, when the water stop material S sufficiently penetrates into the core wire 94, the covered electric wire 91 is taken out from the water stop material S of the storage tank 96 as shown in FIG.

  Next, as shown in FIG. 4E, a bottomed tubular tube 97 is placed on the tip of the covered electric wire 91 so that the conductor connecting portion 95 is covered. The tube 97 is made of a heat-shrinkable resin. When the tube 97 is heated, the tube 97 gradually contracts as shown in FIGS. 4 (f) and 4 (g).

  If it does in this way, as shown in FIG.4 (g), after the conductor connection part 95 of the covered electric wire 91 is water-stop-processed, the tube 97 will closely_contact | adhere and will be protected.

  However, the above water stop method requires a complicated process of storing the water stop material S in the storage tank 96 and immersing the conductor connection portion 95 in the water stop material S in the storage tank 96. In addition, there is a problem that the water-stopping material S immersed from the conductor connecting portion 95 falls off. Further, since a heat shrinking process for heating and shrinking the tube 97 is also required, it is difficult to increase productivity.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

It is a perspective view which shows the wire harness which performs a water stop process with the line water stop method which concerns on embodiment of this invention. It is each sectional drawing which shows the process of the water stop process to the wire harness by the line water stop method which concerns on embodiment of this invention. It is a principal part enlarged view which shows the process of the water stop process to the wire harness by the line water stop method which concerns on embodiment of this invention. It is a figure which shows the process of the line water stop method of a reference example.

Explanation of symbols

71: Conductor connection part 72: Covered electric wire 75: Core wire 82: Tube S: Water stop material

Claims (3)

The end portion of the covered electric wire is covered with a bottomed cylindrical shape so that the end of the plurality of covered electric wires arranged in parallel covers the conductor connection portion connecting the core wires exposed from the insulation coating of the covered electric wire. A tube mounting step for covering the tube;
A tube fusion step of applying ultrasonic vibration to the tube and fusing it to the insulation coating of the covered electric wire;
A water-stopping material filling step of filling the tube with a water-stopping material;
A method for stopping water between lines.   The line water stopping method according to claim 1, wherein a water stopping material having thixotropic properties is used.   The line water-stopping method according to claim 1 or 2, further comprising a core wire connecting step of connecting the core wires so that the conductor connecting portion has an uneven shape.

Images