JP2008226525A - Inter-wire water shutoff method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inter-wire water shutoff method capable of surely permeating a water shutoff material even into a small gap between core wires, and enhancing the reliability of a water shutoff treatment by confirming its permeation state. <P>SOLUTION: The inter-wire water shutoff method, for permeating a water shutoff material 80 into core wires 75 exposed of a coated wire 72 constituting a wire harness 70, includes a forming step of forming an opening 77a at an insulation coating 77 in the middle of the coated wire 72; a suctioning step of suctioning a part including the opening 77a of the coated wire 72; and a dropping step dropping the water shutoff material 80 at the exposed part of the core wires 75 at the tip of the coated wire 72, by which the water shutoff material 80 is permeated between the core wires 75 toward the opening 77a from the exposed part of the core wires 75. <P>COPYRIGHT: (C)2008,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).

  As an example of a conventional line water-stop method, the water-stopping material is allowed to permeate inside the insulating coating by sucking air (ie, air) and reducing the pressure during or after the water-stopping material is supplied. It is known (see Patent Document 1).

  As shown in FIG. 8, a covered electric wire (ground electric wire) 51 used in the line water stopping method disclosed in Patent Document 1 has an insulating coating (covering material) 54 around a core wire (conductor) 53. Then, a terminal (ground connection terminal) 52 is crimped (that is, crimped) to one of the terminal portions.

  The crimping of the terminal 52 to the covered electric wire 51 is performed by setting the terminal portion of the covered electric wire 51 from which the insulation coating 54 is removed and the core wire 53 is exposed between the barrels 55 of the terminal 52 and then closing the barrel 55 by caulking. Thereby, the core wire 53 and the insulation coating 54 are fixed to the terminal 52 by pressure bonding.

  In the inter-line water-stopping method used for water-stopping between the core wires 53 of the covered electric wire 51 with the terminal 52 as described above, air inside the insulating coating 54 is supplied from one end portion of the covered electric wire 51. While performing the suction pressure reducing step, a water-stopping material having fluidity is supplied to the other end portion of the covered electric wire 51 in the direction of the arrow 60 so that the water-stopping material penetrates inside the insulating coating 54. .

  However, in the above-mentioned line water stop method, it is difficult to confirm how far the water stop material permeated from the end portion of the covered electric wire has penetrated, resulting in variations in the reliability of the water stop treatment. .

JP 2004-355851 A

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the line water stop method which can solve the said problem.

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 (4).
(1) A line waterproofing method in which a waterproof material is infiltrated into an exposed core wire of a covered electric wire constituting a wire harness,
Forming the opening in the insulation coating in the intermediate portion of the coated wire; and
A suction step for sucking a part including the opening of the covered electric wire;
A dropping step of dripping a water-stopping material on the exposed portion of the core wire of the covered electric wire;
Including
Infiltrating the water blocking material between the core wires from the exposed portion of the core wires toward the opening.
(2) The method for stopping water between lines of (1) above,
A sealing step of sealing the opening with a sealing member after dropping a predetermined amount of the water-stopping material;
(3) It is the line water stop method of said (2),
The opening is sealed by attaching a heat-shrinkable tube as the sealing member around the insulating coating including the opening to cause heat shrinkage.
(4) It is the line water stop method in any one of said (1)-(3),
A terminal is previously crimped to the exposed portion of the core wire of the covered electric wire.

According to the inter-line water-stopping method of (1) above, the water-stopping material is dropped on the exposed portion of the core wire by sucking a part including the opening formed in the intermediate portion of the covered electric wire by the suction method. The water-stopping material can be reliably infiltrated between the core wires from the exposed portion toward the opening.
At this time, by visually checking the water-stopping material at the opening, it is possible to easily grasp the filling state of the water-stopping material, thereby eliminating problems such as insufficient penetration of the water-stopping material. And can improve the reliability of the water stop treatment.
According to the line-water-stopping method of (2) above, the opening can be reliably stopped by sealing the opening with the sealing member.
According to the line water stop method of (3) above, the opening can be sealed and water can be stopped very easily by attaching the heat shrinkable tube to the insulating coating including the opening and causing the heat shrink. .
According to the method for water-stopping between lines (4) above, the water-stopping treatment can be performed on the exposed portion of the core wire of the covered electric wire provided with the terminal by the water-stopping material. As a result, compared to the case where the exposed portion of the covered electric wire provided with terminals is water-stopped by a mold, it is possible to eliminate problems such as generation of restrictions in assembly by the mold and difficulty in stacking arrangement, and high assembly. Can be obtained, and the degree of freedom of routing can be secured.

According to the line waterproofing method of the present invention, a portion including the opening formed in the intermediate portion of the covered electric wire is sucked by the suction method and the water stopping material is dropped on the exposed portion of the core wire. The water-stopping material can be reliably infiltrated between the core wires from the opening toward the opening.
At this time, by visually checking the water-stopping material at the opening, it is possible to easily grasp the filling state of the water-stopping material, thereby eliminating problems such as insufficient penetration of the water-stopping material. And can improve the reliability of the water stop treatment.

  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, one coated electric wire having an insulation coating formed around the periphery of a plurality of core wires and a bundle of the core wires, and a terminal crimped to the exposed portion of the bundle of core wires exposed at one end of the coated wire An example of a wire harness having the above and the following is an explanation of the inter-line water-stop method of the present invention in which a water-stop material is forcibly permeated into the core wire from the tip of the bundle of core wires toward the intermediate portion.

  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 side view illustrating the interior of a wire harness that has been subjected to a water stop treatment by a line water stop method according to an embodiment of the present invention.

  As shown in FIG. 1, the wire harness 70 includes a covered electric wire 72 and a terminal 71 provided at the tip of the covered electric wire 72, and the terminal 71 extends from the insulating coating 77 at the tip of the covered electric wire 72. It is crimped to the exposed portion of the exposed core wire 75.

  In the wire harness 70, an opening 77a is formed in an insulating coating 77 at an intermediate portion thereof, and the periphery of the insulating coating 77 including the opening 77a is covered with a heat-shrinkable tube (blocking member) 78. Yes.

  Further, the wire harness 70 is filled with a water-stopping material 80 from the tip to the exposed portion of the core wire 75 at the position where the opening 77a is formed, and is subjected to water-stopping treatment.

  Here, FIG. 2 shows the line water stop device 10 that performs a water stop process on the wire harness 70. This line water stop device 10 accommodates and seals the rear end side of the covered electric wire 72 including the opening 77 a formed in the insulating coating 77, and is connected to the vacuum chamber 11 and is connected to the vacuum chamber 11. And an air suction device 12 that draws out the air in the decompression chamber 11 so that a pressure difference is generated between the decompression chamber 11 and the exposed portion of the core wire 75 exposed from the insulating coating 77 outside the decompression chamber 11. The water stop material dropping device 13 for dropping the water stop material 80 (the liquid water stop material 80 or the solid water stop material 80) on the exposed portion of the core wire 75 and the opening means 14 are provided. .

  The air suction device 12 is, for example, a vacuum device normally provided in a general factory, and the air suction pipe 18 is connected to the inside of the decompression chamber 11 in communication. The air suction device 12 draws air from the decompression chamber 11 through the air suction pipe 18 with a predetermined suction force, and generates a large pressure difference with respect to the outside.

  The water stop material dropping device 13 has a water stop material supply pipe 16 and drops a predetermined amount of the water stop material 80 from the tip of the water stop material supply pipe 16 onto the exposed portion of the core wire 75.

  In the line waterstop device 10, the waterstop material 80 dropped on the exposed portion of the core wire 75 enters the insulating coating 77 from the exposed portion of the core wire 75 toward the intermediate portion where the opening 77 a is formed, and from the tip thereof. Inhaled.

  The opening means 14 connected to the decompression chamber 11 has an intake passage 21 with an opening / closing valve 20 for increasing the pressure in the decompression chamber 11 whose pressure is lower than that outside the decompression chamber 11. By opening the opening / closing valve 20 of the intake passage 21, the outside air flows into the decompression chamber 11, and the interior of the decompression chamber 11 is increased to atmospheric pressure.

  Next, the case where a water stop process is performed on the wire harness 70 will be described.

  First, as shown in FIG. 3, the opening 77 a is formed by removing a part of the insulating coating 77 or making a hole in the insulating coating 77 at a predetermined position in the intermediate portion of the wire harness 70 before the water stop treatment. Form.

  Next, the rear end side of the covered electric wire 72 including the opening 77 a formed in the insulating coating 77 is accommodated in the decompression chamber 11 of the line water stop device 10.

  In a state where the wire harness 70 is housed in the decompression chamber 11, the air suction device 12 is not driven, the on-off valve 20 of the opening means 14 is opened, and the water stop material dropping device 13 is not driven.

  Next, by closing the opening / closing valve 20 of the opening means 14 and driving the air suction device 12, air is sucked from the decompression chamber 11 so that a pressure difference is generated between the decompression chamber 11 and the exterior of the decompression chamber 11.

  In this state, as shown in FIG. 4, a predetermined amount of the water stop material 80 is dropped from the water stop material dropping device 13 onto the exposed portion of the core wire 75 of the covered electric wire 72 arranged outside the decompression chamber 11.

  In addition, after dropping the water stop material 80 from the water stop material dropping device 13 onto the exposed portion of the core wire 75 of the covered electric wire 72 arranged outside the decompression chamber 11, the air suction device 12 is driven to reduce the pressure inside the pressure reduction chamber 11. A pressure difference may be generated outside the chamber 11.

  In any case, as shown in FIG. 5, the water stop material 80 is forcibly sucked between the core wires 75 from the exposed portion of the core wire 75 in the direction of the arrow shown in FIG. It is. Further, the water blocking material 80 also penetrates between the core wires 75 in the caulking portion 73.

  At this time, the filling state of the water-stopping material 80 can be grasped by visually confirming the water-stopping material 80 at the opening 77 a formed in the insulating coating 77 in the intermediate portion of the wire harness 70.

  When the water stop material 80 has sufficiently penetrated into the core wire 75 of the covered electric wire 72, the permeation process of the water stop material 80 is terminated.

  Specifically, the dripping of the water stopping material 80 from the water stopping material feeding pipe 16 of the water stopping material dropping device 13 is stopped, and the pressure in the decompression chamber 11 that is reduced from the outside of the decompression chamber 11 is increased. For this purpose, the on-off valve 20 of the intake passage 21 is opened, the inside of the decompression chamber 11 is opened to the atmosphere and the pressure is increased, and then the wire harness 70 is taken out from the decompression chamber 11 as shown in FIG.

  Next, a heat-shrinkable tube 78 is attached to the opening 77a formed in the insulating coating 77 of the wire harness 70, the heat-shrinkable tube 78 is thermally contracted, and the periphery of the insulating coating 77 including the opening 77a is thermally contracted. Covered with a sex tube 78.

  Thus, according to the above-described embodiment, a portion including the opening 77a formed in the intermediate portion of the covered electric wire 72 is sucked by the suction method, and the water stop material 80 is dropped on the exposed portion of the core wire 75 at the tip. The water blocking material 80 can be reliably infiltrated between the core wires 75 from the exposed portion of the core wire 75 toward the opening 77a.

  At this time, by visually confirming the water-stopping material 80 at the opening 77a, the filling state of the water-stopping material 80 can be easily grasped. Problems can be eliminated and the reliability of the water stop treatment can be improved.

  Moreover, by attaching the heat-shrinkable tube 78 to the insulating coating 77 including the opening 77a and causing the heat-shrinkage, the opening 77a can be sealed very easily and water can be stopped.

  Here, there is a technique for performing a water stop treatment by molding the crimped portion 73 of the terminal 71 including the core wire 75 exposed at the tip with a resin or a tube, but in this case, the wire harness that is not subjected to the water stop treatment is used. On the other hand, the shape and size of the tip portion differ depending on the resin or tube mold.

  Therefore, there arises a problem that the assembling of the wire harness is restricted, or the laminated arrangement that is possible when the water stop treatment is not performed cannot be performed.

  On the other hand, in the above embodiment, the exposed portion of the core wire 75 at the tip of the covered electric wire 72 provided with the terminal 71 is also stopped without being molded into the crimped portion 73 of the terminal 71 including the core wire 75 exposed at the tip. Since the water material 80 can be used to stop the water, it is possible to eliminate problems such as restrictions on assembly and the inability to arrange the stacks, assuring high assemblability and ensuring freedom in routing. can do.

  FIG. 7 is a perspective view of the line water stop device 10 that performs a water stop process on the wire harness 70. The rear end portions of the covered electric wires 72 of the plurality of wire harnesses 70 are connected so as to penetrate through the annular rubber plugs in the plurality of through holes of the decompression chamber 11. The air suction device 12 includes a suction pump 12a to which one end of a pipe 12b is connected, a pressure control panel 12c to which the other end of the pipe 12b is connected, and air connected between the pressure control panel 12c and the decompression chamber 11. A suction tube 18. In addition, illustration in FIG. 7 about the water stop material dripping apparatus 13 and the open | release means 14 is abbreviate | omitted.

  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 the side view which saw through the inside of the wire harness which shows the wire harness which concerns on embodiment of this invention. It is sectional drawing which shows typically the line water stop apparatus used for the line water stop method which concerns on embodiment of this invention. It is the side view which saw through the inside of the wire harness explaining the water stop process with respect to a wire harness. It is sectional drawing of the line water stop apparatus explaining the water stop process with respect to a wire harness. It is sectional drawing of the line water stop apparatus explaining the water stop process with respect to a wire harness. It is the side view which saw through the inside of the wire harness explaining the water stop process with respect to a wire harness. It is a perspective view of the line water stop apparatus which performs the water stop process with respect to a wire harness. It is a figure for demonstrating the conventional line water stop method.

Explanation of symbols

70: Wire harness 71: Terminal 72: Covered electric wire 75: Core wire 77: Insulation coating 77a: Opening 78: Heat-shrinkable tube (sealing member)
80: Water stop material

Claims (3)

A line water-stop method for infiltrating a water-stop material into the exposed core wire of the covered electric wire constituting the wire harness,
Forming the opening in the insulation coating in the intermediate portion of the coated wire; and
A suction step for sucking a part including the opening of the covered electric wire;
A dropping step of dripping a water-stopping material on the exposed portion of the core wire of the covered electric wire;
Including
The line waterstop method, wherein the waterstop material is infiltrated between the core wires from the exposed portion of the core wire toward the opening.   The line-water-stopping method according to claim 1, further comprising a sealing step of sealing the opening by a sealing member after a predetermined amount of the water-stopping material has been dropped.   The method for water-stopping a line according to claim 1 or 2, wherein a terminal is crimped in advance to an exposed portion of the core wire of the covered electric wire.

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