JP5264130B2 - Line water stop method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inter-cable water cutoff method superior in versatility in which water cutoff processing can be carried out excellently and water cutoff parts can be protected certainly. <P>SOLUTION: This inter-cable water cutoff method is constituted so that core wires 75 of a covered cable 72 constituting a wiring harness 70 is cut off by a water cut-off agent S, and comprises a resin sheet preparation step to prepare a resin sheet 81 of a size based on diameters of the core wires 75 of the covered cable 72, a water cut-off agent dropping step to drop the water cut-off agent S on the resin sheet 81, a resin sheet forming step to form in a ring shape the resin sheet 81 with the adhered face of the water cut-off agent S inside, an arrangement step in which a wire connection part 71 being an exposed portion of the core wires 75 of the covered cable 72 is arranged in the resin sheet 81 of a ring shape, and a pinching step in which the resin sheet 81 is crushed and the wire connection part 71 of the core wires 75 of the covered cable 72 is pinched by the resin sheet 81. <P>COPYRIGHT: (C)2009,JPO&amp;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).

  In a wire harness in which a terminal is crimped and fixed to a core wire exposed at one end, a water stop material is infiltrated from the exposed portion of the core wire to the inside of the insulating coating to perform interline water stop (for example, Patent Document 1).

  As shown in FIG. 4, a covered electric wire (ground wire) 51 has an insulating coating (covering material) 54 around a core wire (conductor) 53, and a terminal (ground connection terminal) 52 is provided at one of its terminal portions. Crimped (ie, crimped).

  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. .

  By the way, according to the water stop method described above, the water stop material can be filled between the core wires 53, but the core wire remains exposed at the water stop material filling portion, and this exposed portion is protected. preferable.

  On the other hand, the core wires are exposed at positions close to the terminals, the strands are welded together, and a tape coated with silicon is wrapped around the exposed portions, and the water that has entered from the connection portions of the terminals is applied to the water stop points. There is a technique for shutting off (see, for example, Patent Document 2).

  However, with this technique, it is not possible to prevent water from entering the core wire on the terminal side of the water stop point.

  In addition, there is a technique in which core wires at intermediate portions of a plurality of covered electric wires are molded with a conductive resin and a tape is wound (for example, see Patent Document 3).

  However, this technique increases the reliability of the connection in a structure in which core wires of a plurality of covered electric wires are connected to each other, and it is particularly difficult to achieve water blocking.

  Further, there is a technique in which a plurality of covered electric wires are bundled, a sponge is wound, and a water stop material is impregnated and fitted into a grommet (for example, see Patent Document 4).

  However, this technique is a technique for bundling a plurality of covered electric wires constituting a wire harness and stopping water between the covered electric wires, and in this case as well, water between core wires in the covered electric wire cannot be stopped.

  In addition, there is a technique in which core wires exposed at the tip portions of a plurality of covered electric wires are joined to each other, and a resin tube is put on the joined portions and folded, and tape is wound around to protect (see, for example, Patent Document 5). .

  However, this technique is a technique for protecting the joint portion of the core wire with a tube, and it is difficult to expect good water stoppage. And since the diameter of the junction part of a core wire changes according to the number of a covered electric wire, it was necessary to prepare the tube of a different diameter according to the diameter of the junction part, and the versatility was scarce.

  The bonder is formed by electrically connecting conductors (that is, core wires) 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. Further, 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, on a conductor connecting portion (that is, an electric wire connecting portion) of the bundle of covered electric wires. Is a portion covered from the opening so as to accommodate and protect the wire connecting portion of the covered electric wire.

  As described above, in the automobile related industry, the wire connecting portion of the electric wire to which the insulation protection member is attached is called a “bonder” (see, for example, Patent Document 6) or “splice (splice portion)”. (See, for example, Patent Documents 7 and 8).

JP 2004-355851 A JP 2004-72943 A JP 2002-10426 A JP 7-39046 A JP-A-9-180774 JP 2007-66662 A JP 11-89056 A JP-A-9-205719

  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-mentioned object, the line water stopping method according to the present invention is characterized by the following (1) and (2).
(1) A line water stopping method for stopping the core wire of a covered electric wire constituting a wire harness with a water stopping material,
Resin sheet preparation step of preparing a resin sheet of a size based on the diameter of the core wire in the covered electric wire,
A water stopping material dropping step for dropping the water stopping material on the resin sheet;
A resin sheet forming step in which the resin sheet is formed in an annular shape with the adhesion surface of the water stop material inside;
An arrangement step of arranging an exposed portion of the core wire at one end of the covered electric wire in the annular resin sheet;
A sandwiching step for penetrating the waterstop material attached to the resin sheet into the core wire by crushing the resin sheet and sandwiching an exposed portion of the core wire at one end of the covered electric wire with the resin sheet ;
Including.
(2) The method for stopping water between lines of (1) above,
The method further includes a joining step of joining together the core wires exposed at one end portions of the plurality of covered electric wires aligned in the same direction and bundled .

According to the above-described water stopping method (1), the exposed portion of the core wire at one end of the covered electric wire is sandwiched between the resin sheets, so that the water stopping material adhered to the resin sheet can penetrate into the core wire and be excellent. Water stop treatment can be performed, and the water stop portion can be reliably protected by the resin sheet. In particular, since the resin sheet is prepared according to the diameter of the exposed portion of the core wire that is stopped and protected, versatility can be improved as compared with the case where the tube is covered with the core wire.
According to the line water stopping method of the above (2), the wire connecting portion formed by joining the core wires exposed at one end portions of the plurality of covered electric wires aligned in the same direction and bundled together. Also, the water stop treatment can be performed well, and the water stop portion can be covered and protected.

  According to the inter-line water-stopping method of the present invention, the water-stopping material adhered to the resin sheet can be permeated into the core wire by sandwiching the exposed portion of the core wire with the resin sheet, so that the water-stopping treatment can be performed well. Moreover, the water stop location can be reliably protected by the resin sheet. In particular, according to the water-stopping method of the present invention, since the resin sheet is prepared according to the diameter of the exposed portion of the core wire to be water-stopped and protected, the versatility is improved as compared with the case where the tube is covered with the core wire. Can be made.

  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 waterproof material is infiltrated between the core wires from the exposed portion of the bundle of core wires (ie, the wire connection portion) to the inside of the insulation coating, and further the exposed portions are protected. The line water stopping method of the present invention 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 line 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, and the core wires 75 are exposed from the insulating coating 77 at the tips of the covered electric wires 72, and the core wires 75 are welded together. They are electrically connected to each other to form a wire connecting portion 71.

  Next, the case where a water stop process is performed on the wire connection portion 71 at the tip of the wire harness 70 will be described.

  2 (a) to 2 (e) are perspective views showing a water-stopping process for the wire harness.

  First, as shown in FIG. 2 (a), a resin sheet 81 extruded in a tape shape is cut into a predetermined length, and a water-stopping material is supplied onto the resin sheet 81 as shown in FIG. 2 (b). The water-stopping material S (liquid water-stopping material or a solid water-stopping material) is dropped by the vessel 82. Here, the length of the resin sheet 81 is set to a length sufficient to wind and cover the wire connection portion 71 according to the diameter of the wire connection portion 71.

  Next, as shown in FIG. 2 (c), both ends of the resin sheet 81 are joined to form an annular shape, and the wire connecting portion 71 of the wire harness 70 is connected to the annular resin sheet 81 in FIG. 2 (c). Insert in the direction of the arrow a.

  As shown in FIG. 2 (d), when the wire connecting portion 71 of the wire harness 70 is arranged in the annular resin sheet 81, the annular resin sheet 81 is crushed.

  If it does in this way, the electric wire connection part 71 of the wire harness 70 will be pinched | interposed and covered with the resin sheet 81. FIG.

  Further, at this time, the water blocking material S dropped on the resin sheet 81 adheres to the core wire 75 in the electric wire connecting portion 71 and penetrates between the core wires 75 in the insulating coating 77 toward the rear end side.

  Thereby, the wire harness 70 is water-stopped at the tip end side by the water stop material S, and the exposed portion of the core wire 75 of the wire connecting portion 71 at the tip is reliably covered and protected by the resin sheet 81.

  Thus, according to the above-described embodiment, by holding the exposed portion of the core wire 75 between the resin sheets 81, the water-stopping material S adhered to the resin sheet 81 is permeated into the core wire 75 and the water-stop treatment is satisfactorily performed. Moreover, the water stop location can be reliably protected by the resin sheet 81.

  In particular, since the resin sheet 81 is prepared according to the diameter of the exposed portion of the core wire 75 that is stopped and protected, versatility can be improved as compared with the case where the tube is covered with the core wire 75.

  Now, in order to explain the further superiority of the present invention, reference examples are shown in FIGS. Drawing 3 (a)-(d) is a figure showing a process of a line water stop method.

  In this reference example, a description will be given of a water stop process at an electric wire connecting portion in which core wires of a plurality of covered electric wires are electrically connected and bundled.

  First, as shown in FIG. 3A, the plurality of covered electric wires 91 are collected by the adhesive tape 92, and the core wires 94 exposed from the insulating coating 93 are joined together to form the electric wire connecting portion 95.

  Next, as shown in FIG. 3 (b), the wire connecting portion 95 in which the core wires 94 are joined to each other is immersed in the low viscosity water stop material S.

  Thereafter, as shown in FIG. 3 (c), a tube 96 made of a heat-shrinkable resin having an adhesive material attached to the inner surface is attached to the electric wire connecting portion 95 in which the water stop material S is immersed, and FIG. As shown in FIG. 5, the hot air is blown by a heater 97 such as a dryer, and the tube 96 is contracted.

  If it does in this way, after the electric wire connection part 95 of the covered electric wire 91 is water-stopped, it will be covered with the tube 96 and protected.

  However, in the water stop method described above, since the tube 96 is heat-shrinked and attached, the joining force of the tube 96 to the covered electric wire 91 may be reduced, and a gap may be generated to reduce the sealing performance.

  In addition, since the diameter of the wire connection portion 95 that is the joint portion of the core wire 94 changes depending on the number of the covered electric wires 91, tubes 96 having different diameters corresponding to the diameter of the wire connection portion 95 must be prepared. Poor versatility.

  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 should be noted that the line water stopping method of the present invention can also be applied to a wire connecting portion formed by joining portions of core wires exposed from the insulating coating at the longitudinal intermediate portions of a plurality of covered wires. Needless to say. Also in this case, the water stop treatment is performed well, and the water stop portion is reliably protected.

  Further, it is needless to say that the inter-line water stopping method of the present invention can be applied to a wire harness including a plurality of core wires and a single covered electric wire having an insulation coating formed around the bundle of the core wires. Yes. Also in this case, the water stop treatment is performed well, and the water stop portion is reliably protected.

  In addition, although the resin sheet is crushed in the above-described line water stopping method of the present invention, the resin sheets can be welded and fixed together by a method such as thermocompression bonding or ultrasonic welding instead.

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 perspective 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. It is a figure for demonstrating the conventional line water stop method.

Explanation of symbols

70: Wire harness 71: Electric wire connection part (exposed part)
72: Covered electric wire 75: Core wire 81: Resin sheet S: Water stop material

Claims (2)

A line water-stop method for stopping a core wire of a covered electric wire constituting a wire harness with a water-stop material,
Resin sheet preparation step of preparing a resin sheet of a size based on the diameter of the core wire in the covered electric wire,
A water stopping material dropping step for dropping the water stopping material on the resin sheet;
A resin sheet forming step in which the resin sheet is formed in an annular shape with the adhesion surface of the water stop material inside;
An arrangement step of arranging an exposed portion of the core wire at one end of the covered electric wire in the annular resin sheet;
A sandwiching step for penetrating the waterstop material attached to the resin sheet into the core wire by crushing the resin sheet and sandwiching an exposed portion of the core wire at one end of the covered electric wire with the resin sheet ;
A method for stopping water between lines. The line water stop method according to claim 1, further comprising a joining step of joining together core wires exposed at one end portions of the plurality of covered electric wires that are aligned in the same direction and bundled .

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