JP2008204644A - Manufacturing method of waterproof harness, waterproof agent for harnesses, and waterproof harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a waterproof harness or the like having enhanced waterproof performance in a connection processing part of an electrically connected wire terminal. <P>SOLUTION: This manufacturing method of a waterproof harness 10a has a preparation process to prepare a wire harness 10 which has core wires 111, 121, 131 comprising a plurality of conductor strands 113, 123, 133 respectively, and a plurality of wires 11, 12, 13 having insulating coatings 112, 122, 132 surrounding the core wires, and in which exposed ends 111a, 121a, 131a exposed from one ends of the insulating coatings in the respective core wires of a plurality of the wires are connected with each other, and a waterproof treatment process to heat and contract a protective tube 19 with a terminal part 102 comprising a portion in the vicinity of the one end of the exposed end and the insulating coating inserted in the thermally shrinkable protective tube 19, and with an anaerobic adhesive agent 18 infiltrated into a gap between the conductor strands in the terminal parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a harness, and particularly relates to a waterproof harness manufacturing method, a harness waterproofing agent, and a waterproof harness.

  A harness that is routed inside a device such as an automobile body or an electric device is provided with a number of wire connection portions that branch and connect wires distributed to each device of the device. In the electric wire connection part, the core wires exposed from the end of the insulation coating of each of the plurality of electric wires are connected. In the electric wire connection part, in order to insulate and waterproof the core wire from the outside, for example, it is covered with a protective tube.

  However, when the electric wire is of a type in which a core wire composed of a plurality of conductor strands is insulated and coated, a gap exists between the conductor strands. The gap between the conductor wires exists in the portion covered with the protective tube as well as in the insulating coating. For this reason, a part of the electric wires branched at the electric wire connecting portion is routed to a place where it is easily covered with water, for example, in an engine room of an automobile. Depending on the phenomenon, it penetrates to the wire connection. The water that has infiltrated up to the electric wire connection portion enters the other electric wires that are further branched and connected via the inside of the protective tube, and is transmitted to the devices arranged in other places.

For this problem, for example, in Patent Document 1, after electrically connecting core wire bundles in a plurality of wire terminals, the wire wires are immersed in a cyano-based adhesive and then inserted into a protective tube. A connection method is disclosed. Since the cyano adhesive before curing has a low viscosity, it is filled in the gaps between the conductor wires. Therefore, in the method of Patent Document 1, not only waterproofing of the outside of the wire connection part but also waterproofing between the wires in the wire connection part is achieved.
JP-A-9-55278

  However, the cyano adhesive filled in the method disclosed in Patent Document 1 has a property of hydrolyzing after curing, although it has a low viscosity and is easy to enter. For this reason, there is a possibility that the cyano-based adhesive may be deteriorated while touching the moisture entering through the electric wire, and the waterproof performance may be deteriorated.

  An object of this invention is to provide the manufacturing method of the waterproof harness in which the waterproof performance in the connection process part of the electrically connected electric wire terminal was improved in view of the said situation, the waterproofing agent for harnesses, and a waterproof harness.

The manufacturing method of the 1st waterproof harness of this invention which solves the said subject is as follows.
It has a plurality of electric wires having a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire, and an exposed end exposed from one end of the insulating coating of each of the core wires of each of the plurality of electric wires is A preparation step of preparing wire harnesses connected to each other;
An end portion comprising the exposed end and a portion near the one end of the insulating coating is inserted into a heat-shrinkable protective tube, and anaerobic in the gap between the conductor strands at the end portion. And a waterproofing step of heat-shrinking the protective tube in a state where the fixing agent is infiltrated.

  Here, the waterproof harness and the wire harness mean those having a plurality of electric wires with the outer periphery of the core wire insulated, and not only those having a simple configuration consisting of a plurality of connected electric wires, but also a plurality of connected electric wires. This includes a concept that includes a plurality of systems and a combination of electric wires of different systems that do not have a connection portion, and also includes a concept that includes electrical components such as connectors. Moreover, an anaerobic fixing material means the fixing agent which starts hardening, when contact with air is interrupted | blocked.

  In the first waterproof harness manufacturing method of the present invention, when the protective tube is heated and shrunk in a state where the anaerobic fixing agent is infiltrated into the gap between the conductor wires, the air inside is expelled, thereby causing the anaerobic fixing. The agent is cured. Since the solidified anaerobic fixing agent is in a state in which the gaps between the conductor wires are filled, water that has traveled through some of the wires is prevented from entering the other wires. Since the anaerobic fixing agent before curing has a low viscosity like the cyano adhesive, it penetrates well between conductor wires. Furthermore, since the anaerobic fixing agent after curing does not hydrolyze, it does not deteriorate due to the moisture transmitted through the electric wire. Therefore, according to the first method for manufacturing a waterproof harness of the present invention, the waterproof performance of the harness is enhanced as compared with the conventional method using a cyano adhesive.

Here, in the first waterproof harness manufacturing method of the present invention, the waterproof treatment step includes
A dipping step of immersing the terminal portion in the anaerobic fixing agent to infiltrate the anaerobic fixing agent into the gap between the conductor strands;
An insertion step of inserting the terminal portion after being immersed in the anaerobic fixing agent into a heat-shrinkable protective tube;
And heating the protective tube in a state where the terminal portion is inserted, thereby contracting the protective tube and curing the anaerobic fixing agent.

  Unlike an cyano adhesive, for example, an anaerobic fixing agent does not harden due to moisture in the air, so that the low viscosity property hardly deteriorates even if it is placed in a container without a lid and exposed to air. For this reason, the immersion process which immerses an electric wire in an anaerobic adhesive agent can be performed in a general working environment, and management of an adhesive agent is easy.

  In the first waterproof harness manufacturing method of the present invention, the anaerobic fixing agent is preferably a methacrylic ester-based fixing agent.

  Since the curing of the methacrylic acid ester-based fixing agent is accelerated by contact with the metal, the curing can be more reliably performed in the gap between the metal conductor strands.

  Moreover, the first waterproofing agent for harness of the present invention that achieves the above object has a plurality of electric wires having a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire. Of the wire harness in which the exposed ends exposed from one end of the insulating coating among the core wires of each of the electric wires are connected to each other, and the terminal is covered with a protective tube and includes a portion near the one end of the insulating coating. A waterproofing agent for a harness that waterproofs a portion, and is made of an anaerobic fixing agent.

  Since the waterproofing agent for harness made of an anaerobic fixing agent does not hydrolyze even when it comes into contact with water, high waterproof performance can be imparted to the terminal portion of the harness.

  Here, also in the first waterproofing agent for harness, the anaerobic fixing agent is preferably a methacrylic ester-based fixing agent.

The first waterproof harness of the present invention that achieves the above object has a plurality of electric wires each having a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire. A wire harness in which exposed ends exposed from one end of the insulating coating are connected to each other among the core wires,
A protective tube that covers a terminal portion composed of the exposed end and a portion near the one end of the insulating coating;
An anaerobic fixing agent filled in a gap between the conductor wires in the terminal portion is provided.

  In the 1st waterproof harness of this invention, since the anaerobic fixing agent with which it filled in the clearance gap between core wires does not hydrolyze, waterproof performance is high.

  Here, also in the first waterproof harness, the anaerobic fixing agent is preferably a methacrylic ester-based fixing agent.

Moreover, the second method for producing a waterproof harness of the present invention that achieves the above-described object,
Preparation for preparing a wire harness having a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire, and an electric wire having an exposed portion exposed from the middle of the insulating coating on the core wire Process,
A state in which the damming portion composed of the exposed portion and the portion of the insulating coating near the exposed portion is inserted into a heat-shrinkable protective tube, and in the gap between the conductor strands in the damming portion And a waterproofing step for heat-shrinking the protective tube in a state where the anaerobic fixing agent is infiltrated into the protective tube.

  The manufacturing method of the 2nd waterproof harness of this invention differs from the manufacturing method of the said 1st waterproof harness in the place which makes anaerobic fixing agent osmose | permeate. In the second method for manufacturing a waterproof harness, an anaerobic fixing agent is infiltrated into the core wire exposed from the insulating coating at a damming portion provided in the middle of the electric wire constituting the harness. When the anaerobic fixing agent is infiltrated into the gap between the conductor wires in the damming portion and the protective tube into which the damming portion is inserted is heated and shrunk, the internal air is expelled to expel the anaerobic fixing agent. Is cured. Since the solidified anaerobic fixing agent is in a state in which the gaps between the conductor wires are filled, the water transmitted from one side of the electric wire is blocked by the blocking portion and prevents the other from entering the other. Since the anaerobic fixing agent after curing does not hydrolyze, it is not altered by the moisture that has passed through the wire. Therefore, according to the second method for manufacturing a waterproof harness of the present invention, the waterproof performance of the harness is enhanced as compared with the conventional method using a cyano adhesive.

Here, also in the manufacturing method of the second waterproof harness of the present invention, the waterproof treatment step includes:
A dipping step of immersing the damming portion in the anaerobic fixing agent and allowing the anaerobic fixing agent to penetrate into the gap between the conductor strands;
An insertion step of inserting the damming portion into the heat-shrinkable protective tube after being immersed in the anaerobic fixing agent;
A heating step of shrinking the protective tube and curing the anaerobic fixing agent by heating the protective tube in a state where the damming portion is inserted may be included.

  Also in the manufacturing method of the said 2nd waterproof harness of this invention, it is preferable that the said anaerobic fixing agent is a methacrylic acid ester type fixing agent.

  In addition, a second waterproofing harness waterproofing agent of the present invention that achieves the above object has a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire, and the core wire is coated with the insulating coating. For a harness that has a wire harness provided with an exposed portion that is exposed from the middle, and that waterproofs a damming portion that is composed of the exposed portion and a portion near the exposed portion of the insulating coating and is covered with a protective tube. A waterproofing agent comprising an anaerobic fixing agent.

  Since the waterproofing agent for harness made of an anaerobic fixing agent does not hydrolyze even when it comes into contact with water, high waterproof performance can be imparted to the damming portion of the harness.

  Here, also in the second waterproofing harness waterproofing agent of the present invention, the anaerobic fixing agent is preferably a methacrylic ester-based fixing agent.

Further, the second waterproof harness of the present invention that achieves the above object has a core wire composed of a plurality of conductor wires and an insulating coating surrounding the core wire, and is exposed to the core wire from the middle of the insulating coating. A wire harness including an electric wire having an exposed portion formed thereon,
A protective tube for covering the damming portion composed of the exposed portion and a portion of the insulating coating near the exposed portion;
An anaerobic fixing agent filled in a gap between the conductor wires in the damming portion is provided.

  In the 2nd waterproof harness of this invention, since the anaerobic fixing agent with which the clearance gap provided in the middle of the electric wire was filled in the clearance gap between core wires does not hydrolyze, waterproof performance is high.

  Here, also in the second waterproof harness of the present invention, the anaerobic fixing agent is preferably a methacrylic ester-based fixing agent.

  As described above, according to the present invention, a waterproof harness manufacturing method, a waterproofing agent for harness, and a waterproof harness with improved waterproof performance in the connection processing unit are realized.

  Embodiments of the present invention will be described below with reference to the drawings.

  1, FIG. 2, FIG. 4 and FIG. 5 are diagrams showing a preparation process, a dipping process, an insertion process, and a heating process, respectively, among the processes for manufacturing a waterproof harness according to an embodiment of the present invention.

  In the method for manufacturing a waterproof harness according to the present embodiment, the preparation step shown in FIG. 1, the dipping step shown in FIG. 2, the insertion step shown in FIG. 4, and the heating step shown in FIG. Each process will be described in order.

  First, in the preparation step shown in FIG. 1, a wire harness 10 including a plurality of electrically connected electric wires 11, 12, 13 is prepared. In the example of FIG. 1, a wire harness 10 including three electric wires 11, 12, and 13 is shown. The three electric wires 11, 12, and 13 each have core wires 111, 121, and 131 made of a plurality of conductor strands, and insulating coatings 112, 122, and 132 that surround the core wires 111, 121, and 131. . The conductor wires constituting the core wires 111, 121, 131 are made of a metal material such as copper, and the insulating coatings 112, 122, 132 are made of synthetic resin. Of each of the core wires 111, 121, 131, the exposed ends 111a, 121a, 131a are exposed from one ends 112a, 122a, 132a of the insulating coatings 112, 122, 132. The core wires 111, 121, 131 are electrically connected to each other in a bundled state at the connection portion 101 that is the tip portion of the exposed ends 111a, 121a, 131a. The core wires 111, 121, 131 are connected to each other by crimping, welding, or the like.

  In the preparation process of the wire harness 10 shown in FIG. 1, first, three electric wires 11, 12, 13 composed of the core wires 111, 121, 131 and the insulating coatings 112, 122, 132 are prepared. Next, the end portions of the insulating coatings 112, 122, 132 are peeled off to expose the core wires 111, 121, 131 from the 112a, 122a, 132a. The exposed portions become exposed ends 111a, 121a, and 131a. Next, the electric wires 11, 12, and 13 are arranged in substantially the same direction so that the tips of the exposed ends 111a, 121a, and 131a are aligned. Next, the tip portions of the exposed ends 111a, 121a, and 131a are heated and welded, for example, in close contact with each other to form the connection portion 101. Thus, the wire harness 10 to which the exposed ends 111a, 121a, 131a of the core wires 111, 121, 131 exposed from the ends of the insulating coatings 112, 122, 132 are connected is obtained.

  Here, in the electric wires 11, 12, and 13, the exposed ends 111 a, 121 a, and 131 a of the core wires 111, 121, and 131 and the portions near the ends 112 a, 122 a, and 132 a of the insulating coatings 112, 122, and 132 are Called.

  Next, in the dipping process shown in FIG. 2, the terminal portion 102 is dipped in the anaerobic fixing agent 18 as a harness waterproof material among the electric wires 11, 12, and 13 shown in FIG. 1.

  The anaerobic fixing agent 18 is a fixing agent that starts curing when contact with air is blocked, and more specifically, is a fixing agent that starts curing by blocking oxygen in the air. Since the anaerobic fixing agent 18 has a low viscosity before being cured, it penetrates into the gaps between the conductor wires constituting the core wires 111, 121, 131 without any gaps. As shown in FIG. 2, in the state where the terminal portion 102 is immersed in the anaerobic fixing agent 18, the anaerobic fixing agent 18 is not only the exposed ends 111 a, 121 a, 131 a of the core wires 111, 121, 131 but also the exposed ends. In the terminal portion 102 including the inside of the insulating coatings 112, 122, 132 in the vicinity of 111a, 121a, 131a, it penetrates into the gaps between the conductor wires.

  FIG. 3 is a partial cross-sectional view showing the internal structure of the electric wire in the dipping process shown in FIG.

  FIG. 3 schematically shows a part of the electric wire 11 as a representative of the electric wires 11, 12, and 13.

  As shown in FIG. 3, the anaerobic fixing agent 18 surrounds the conductor wire 113 constituting the core wire 111 and penetrates into the gap between the conductor wires 113. The anaerobic fixing agent 18 also penetrates into the gap between the conductor wire 113 and the insulating coating 112.

  As the harness waterproofing material used in the dipping process shown in FIG. 2, if the viscosity before curing is 30 mPa · s (millipascal second) (= 30 cp (centipoise)) or less, between the conductor wires 113 in the dipping process It penetrates evenly into the gaps. The anaerobic fixing agent 18 has a viscosity before curing of 30 mPa · s (30 cp) or less, and penetrates into the gaps between the conductor wires 113 evenly. As the anaerobic fixing agent 18, for example, a methacrylic acid ester-based fixing agent containing an acrylic monomer as a main component and containing a peroxide and an anaerobic catalyst can be employed. As a peroxide and an anaerobic catalyst, the thing containing an organic peroxide, a tertiary amine, and saccharin is employable, for example. The methacrylic acid ester-based fixing agent is a fixing agent that cures when the main component acrylic monomer is rapidly polymerized by a radical reaction caused by air blocking and contact with a metal, and has a viscosity before curing of 10 mPa · s ( 10 cp) or less. For this reason, the anaerobic fixing agent 18 made of a methacrylic ester-based fixing agent is completely filled in the gaps between the conductor wires 113 in the dipping process. In addition, unlike the cyano-based adhesive, the anaerobic fixing agent 18 is not cured by moisture in the air, so that the low-viscosity property deteriorates even if it is placed in a container without a lid in the dipping process and exposed to air. Unlike cyano-based adhesives, when cured, it has the property of not decomposing even when it comes into contact with moisture.

  Next, in the insertion step shown in FIG. 4, the end portions 102 of the electric wires 11, 12 and 13 after being immersed in the anaerobic fixing agent are inserted into the protective tube 19. The protective tube 19 shown in FIG. 4 is a so-called bag-shaped heat-shrinkable tube, and has a cylindrical shape with one end recessed. The protective tube 19 has two layers, in particular, an outer layer 191 made of a heat-shrinkable resin that shrinks in the radial direction of the cylinder, and an inner layer 192 made of a thermoplastic hot-melt resin disposed inside the outer layer 191. It has a structure.

  Next, in the heating process shown in FIG. 5, the conductor element in the terminal part 102 is inserted in the state in which the terminal parts 102 of 11, 12, and 13 are inserted into the protective tube 19 with the insertion process electric wire of FIG. The protection tube 19 is heated together with the end portions 102 of the electric wires 11, 12, and 13 in a state where the anaerobic fixing agent is infiltrated into the gap between the wires. In the heating step, the outer layer 191 of the protective tube 19 is contracted and heated to a temperature at which the hot-melt resin of the inner layer 192 melts, for example, about 130 ° C.

  By this heating process, the protective tube 19 contracts, covers the terminal portions 102 of the electric wires 11, 12, and 13, and expels air inside the protective tube 19 to the outside. Furthermore, in the state where the hot melt resin inside the protective tube 19 is melted, the outside of the terminal portion 102 of the electric wires 11, 12, 13 is covered, so that the air inside the protective tube 19 is efficiently expelled to the outside. The anaerobic fixing agent 18 inside the protective tube 19 is cured by blocking the air. Curing of the anaerobic fixing agent 18 is accelerated by contact with the metal constituting the core wires 111, 121, 131. Moreover, hardening of the anaerobic fixing agent 18 is accelerated by heating.

  After the anaerobic fixing agent 18 is cured, the protective tube 19 and the electric wires 11, 12, and 13 are cooled to cure the hot melt resin, thereby obtaining the waterproof harness 10a shown in FIG. Here, the combination of the dipping process shown in FIG. 2, the insertion process shown in FIG. 4, and the heating process shown in FIG. 5 corresponds to an example of the waterproofing process in the present invention.

  Subsequently, a waterproof harness according to an embodiment of the present invention manufactured by the above-described waterproof harness manufacturing method will be described with reference to FIG.

  A waterproof harness 10a shown in FIG. 5 includes three electric wires 11, 12, and 13, a protective tube 19a that covers the electric wires 11, 12, and 13, and a cured anaerobic adhesive as a harness waterproof material in the protective tube 19a. 18a (see FIG. 6). The electric wires 11, 12, and 13 include core wires 111, 121, and 131 made of a plurality of conductor strands, and insulating coatings 112, 122, and 132 that surround the core wires 111, 121, and 131. , 122, 132 are partially connected to the exposed ends 111 a, 121 a, 131 a (the core wire 121 and the exposed end 121 a refer to FIG. 1). The protective tube 19a is a heat-shrinkable protective tube 19 (see FIG. 4) that has been heat-shrinked. Of the core wires 111, 121, and 131, the exposed ends 111a, 121a, and 131a, and the exposed ends 111a, 121a, and 131a. It covers the terminal portion 102 composed of the nearby insulating coatings 112, 122, 132.

  6 is a cross-sectional view showing a schematic cross-sectional structure of the waterproof harness shown in FIG. Part (a) of FIG. 6 shows a cross section taken along line AA of the waterproof harness shown in FIG. 5, and Part (b) of FIG. 6 shows a cross section taken along line BB of the waterproof harness shown in FIG.

  As shown in part (a) of FIG. 6, in the portions of the core wires 111, 121, 131 exposed from the insulating coatings 112, 122, 132, the core wires 111, 121, 131 are made of hot melt resin in the protective tube 19 a. The outer layer 192 is covered with an outer layer 191 of the protective tube 19a. The core wires 111, 121, 131 are each composed of a plurality of conductor strands 113, 123, 133, and the gaps between the plurality of conductor strands 113, 123, 133 are uniformly filled with the cured anaerobic adhesive 18a. Has been.

  As shown in part (b) of FIG. 6, among the core wires 111, 121, 131, the portions in the insulating coating 112, 122, 132 in the terminal portion 102 (see FIG. 5) are in the insulating coating 112, 122, 132. An anaerobic fixing agent 18a that is cured is filled between the conductor wires 113, 123, and 133.

  The viscosity of the hot-melt resin constituting the inner layer 192 is not so low that it penetrates into the gaps between the conductor wires 113, 123, 133 even when heated by the heating process of FIG. 5. However, in the above-described dipping process, the anaerobic adhesive before curing having a low viscosity penetrates into the gaps between the conductor strands 113, 123, 133 and is cured by the above-described heating step. , 133 are completely filled. Therefore, in the waterproof harness 10a (see FIG. 5), for example, even if a liquid such as water enters the insulating coating 112 of one electric wire 11, the waterproof harness 10a is blocked by the terminal portion 102 in the protective tube 19a. It does not enter the insulating coatings 122 and 132 of the electric wires 12 and 13. Moreover, since the hardened anaerobic hardening | curing agent 18a does not hydrolyze, even if it uses for a long time, waterproofness does not deteriorate. Further, liquid such as water does not enter from the gap between the electric wires 11, 12, 13 and the protective tube 19a.

  In the embodiment described above, an example in which one set of three electric wires to which the waterproof harness 10a is connected has been described. Subsequently, a second embodiment of the present invention including an electric wire that is not connected will be described. .

  FIG. 7 is an external view showing a part of a waterproof harness according to the second embodiment of the present invention.

  A waterproof harness 200 shown in FIG. 7 is, for example, connected to devices arranged in each part of the vehicle body by being routed around the body of the automobile, and in addition to the electric wires 21, 22, and 23 connected inside the protective tube 29. In addition, electric wires 24 and 25 that are not connected inside the protective tube 29 are also provided.

  In the above-described embodiment, the electric wires to be connected are described as being arranged in the same direction. Subsequently, a third embodiment in which the directions of the electric wires to be connected are different will be described.

  FIG. 8 is a diagram illustrating a manufacturing process of the waterproof harness according to the third embodiment of the present invention.

  FIG. 8 shows a schematic structure of the waterproof harness according to the third embodiment in the state before the heating step described above.

  The two electric wires 31 and 32 constituting the waterproof harness 300 shown in FIG. 8 are connected by welding or the like in such a manner that the end sides where the core wires 311 and 321 are exposed are opposite to each other, and constitute the core wires 311 and 321. A harness waterproofing agent (not shown) made of an anaerobic fixing material penetrates into the gaps between the conductor wires. In addition, a harness waterproofing agent is a conductor strand by immersing the connected electric wires 31 and 32 in the harness waterproofing agent in the state bent in the U shape between the electric wires 31 and 32. Can penetrate between. The terminal portions 302 of the two electric wires 31 and 32 are inserted into a cylindrical protective tube 39 as shown in FIG. When the protective tube 39 is heated in the state shown in FIG. 8, the protective tube 39 contracts to cover the connection portion. As a result, a so-called intermediate joint harness type waterproof harness composed of linearly continuous electric wires can be obtained.

  In the third embodiment, electric wires arranged one by one in different directions are connected. Subsequently, a fourth embodiment in which a plurality of electric wires are arranged in different directions will be described.

  FIG. 9 is a diagram illustrating a manufacturing process of the waterproof harness according to the fourth embodiment of the present invention.

  In the waterproof harness 400 shown in FIG. 9, a total of six electric wires 41, 42, 43, 44, 45, 46 are connected. Of the six electric wires 41 to 46, the three electric wires 41 to 43 and the remaining three electric wires 44 to 46 are connected to each other on the end side where the core wires 411, 421, 431, 441, 451, 461 are exposed. A harness waterproofing agent (not shown) made of an anaerobic fixing material is permeated into the gaps between the conductor wires constituting the core wires 411 to 461 and connected in an opposite orientation by welding or the like. The terminal portions 402 of the six electric wires 44 to 46 are inserted into a cylindrical protective tube 49 as shown in FIG. When the protective tube 49 is heated in the state shown in FIG. 8, the protective tube 49 contracts to cover the connection portion. As a result, a so-called intermediate joint harness type waterproof harness in which six electric wires are connected is obtained.

  In the above-described embodiment, the example in which the core wires of the plurality of electric wires are connected by welding or the like has been described. Subsequently, a fifth embodiment in which the core wires are connected by pressure bonding will be described.

  FIG. 10 is a diagram illustrating a manufacturing process of the waterproof harness according to the fifth embodiment of the present invention.

  In the waterproof harness 500 shown in FIG. 10, a plate-like connection fitting 501 is wound around a bundle of core wires made up of core wires 511, 521, 531 of three electric wires 51, 52, 53. The connection fitting 501 is crimped and crimped to the core wires 511, 521, 531. Moreover, the harness waterproofing agent which is not shown in figure which consists of an anaerobic fixing material has osmose | permeated in the clearance gap between the conductor strands which comprise the core wires 511-531. Terminal portions 502 of the electric wires 51 to 53 are inserted into a cylindrical protective tube 59. When the protective tube 59 is heated in the state shown in FIG. 9, the protective tube 59 contracts to cover the connection portion. As a result, a so-called intermediate joint harness type waterproof harness in which three electric wires are connected is obtained.

  In the above-described embodiment, the waterproof treatment of a portion where a plurality of electric wires are connected to each other has been described. Subsequently, a sixth embodiment for preventing liquid from being transmitted from one to the other in one electric wire will be described. .

  FIG. 11 is a diagram showing a manufacturing process of the waterproof harness according to the sixth embodiment of the present invention.

  FIG. 11 shows the state before the heating step shown in FIG. 5 described above, among the steps of manufacturing the waterproof harness according to the sixth embodiment, from the viewability of the structure.

  An electric wire 61 constituting the waterproof harness 600 shown in FIG. 11 has a core wire 611 composed of a plurality of conductor wires, and an insulating coating 612 surrounding the core wire 611. The insulating coating 612 is partially removed in the middle of the electric wire 61, and an exposed portion 611 a exposed from the middle of the insulating coating 612 is formed on the core wire 611. In the blocking portion 602 including the exposed portion 611a and the portion of the insulating coating 612 in the vicinity of the exposed portion 611a, the harness waterproofing agent penetrates into the gaps between the conductor wires. Moreover, the blocking part 602 of the electric wire 61 is inserted in the cylindrical protective tube 69 as shown in FIG.

  The state shown in FIG. 11 is obtained by going through the preparation step shown in FIG. 1, the dipping step shown in FIG. 2, and the insertion step shown in FIG. 4, as in the first embodiment described above. However, the preparatory process of the waterproof harness 600 shown in FIG. 11 is that the exposed portion 611a is formed on the core wire 611 by removing the insulating coating 612 in the middle of one electric wire, and the preparatory process shown in FIG. Different. Further, the dipping process of the waterproof harness 600 is different from the dipping process shown in FIG. 2 in that the electric wire 61 is dipped in the harness waterproofing agent in a state of being bent in a U shape at the exposed portion 611a. Other points in the preparation process, the dipping process, and the insertion process are the same as those described with reference to FIGS.

  When the protection tube 69 in the state shown in FIG. 11 is heated in the next heating step, the protection tube 69 contracts to cover the blocking portion 602. The anaerobic fixing agent inside the protective tube 69 is cured by blocking air.

  The waterproof harness 600 obtained through the cooling process after the heating process is in a state in which the cured anaerobic adhesive is filled in the gaps between the conductor wires at the damming portion 602 of the electric wire 61. Therefore, even if the liquid enters the electric wire 61 from one end, it is blocked by the damming portion 602 and does not enter the other end of the electric wire 61. Moreover, since the hardened anaerobic hardening | curing agent does not hydrolyze, even if it uses for a long time, waterproofness does not deteriorate.

  The embodiment of the present invention has been described above, but the present invention is not limited to this. In the embodiment described above, the waterproof harness has been described as having one to six wires, but the present invention is not limited to this, and the number of connected wires is seven or more. May be. However, the number of wires is preferably 10 or less. Moreover, the waterproof harness of the present invention may be one to which an electronic component such as a connector is connected.

  In the above-described embodiment, as the preparation process, a plurality of unconnected electric wires are prepared, the coating is stripped off, and the exposed core wires are connected to each other, but the preparation process of the present invention is this. For example, an electric wire in which the coating is stripped in advance and the exposed core wires are connected may be prepared.

  In the above-described embodiment, the process in which the dipping process, the insertion process, and the heating process are performed in this order has been described as a process corresponding to an example of the waterproof process according to the present invention. The treatment process is not limited to this. For example, in the waterproofing process, the above-described immersion process is omitted, and in the insertion process, a heat-dissolvable capsule in which an anaerobic fixing material is enclosed is put in a protective tube, and in the heating process, the capsule is melted and anaerobic fixing is performed. The material may be allowed to penetrate.

It is a figure which shows a preparatory process among the processes which manufacture the waterproof harness which is one Embodiment of this invention. It is a figure which shows an immersion process among the processes which manufacture the waterproof harness which is one Embodiment of this invention. It is a fragmentary sectional view which shows the internal structure of the electric wire in the immersion process shown in FIG. It is a figure which shows an insertion process among the processes of manufacturing the waterproof harness which is one Embodiment of this invention. It is a figure which shows a heating process among the processes which manufacture the waterproof harness which is one Embodiment of this invention. It is sectional drawing which shows the cross-section of the waterproof harness shown in FIG. It is an external view which shows a part of waterproofing harness which is the 2nd Embodiment of this invention. It is a figure which shows the manufacturing process of the waterproof harness which is the 3rd Embodiment of this invention. It is a figure which shows the manufacturing process of the waterproof harness which is the 4th Embodiment of this invention. It is a figure which shows the manufacturing process of the waterproof harness which is the 5th Embodiment of invention. It is a figure which shows the manufacturing process of the waterproof harness which is the 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wire harness 10a, 200, 300, 400, 500, 600 Waterproof harness 11, 12, 13, 21, 22, 23, 31, 32,
41, 42, 43, 44, 45, 46, 51, 52, 53, 62 Electric wire 111, 121, 131, 311, 321, 411, 421, 431,
441, 451, 461, 511, 521, 531, 611 Core wire 111a, 121a, 131a Exposed end 611a Exposed portion 113, 123, 133 Conductor wire 112, 122, 132, 612 Insulation coating 112a, 122a, 132a One end 102, 302 , 402, 502 Terminal portion 602 Damping portion 18, 18a Anaerobic fixing agent (harness waterproofing agent)
19, 19a, 29, 39, 49, 59, 69 Protection tube

Claims (14)

It has a plurality of electric wires having a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire, and an exposed end exposed from one end of the insulating coating of each of the core wires of the plurality of electric wires is A preparation step of preparing wire harnesses connected to each other;
An end portion comprising the exposed end and a portion in the vicinity of the one end of the insulating coating is inserted into a heat-shrinkable protective tube, and anaerobic in the gap between the conductor wires at the end portion A waterproof harness manufacturing method comprising: a waterproof treatment step of heat-shrinking the protective tube in a state where the fixing agent is infiltrated. The waterproofing process includes
A dipping step of immersing the terminal portion in the anaerobic fixing agent to infiltrate the anaerobic fixing agent into the gap between the conductor strands;
An insertion step of inserting the end portion into the heat-shrinkable protective tube after being immersed in the anaerobic fixing agent;
The waterproof harness according to claim 1, further comprising a heating step of heating the protective tube in a state where the terminal portion is inserted to contract the protective tube and cure the anaerobic fixing agent. Manufacturing method.   2. The method for manufacturing a waterproof harness according to claim 1, wherein the anaerobic fixing agent is a methacrylate ester-based fixing agent.   It has a plurality of electric wires having a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire, and an exposed end exposed from one end of the insulating coating of each of the core wires of the plurality of electric wires is A harness waterproofing agent that waterproofs a terminal portion that is composed of the exposed end of the wire harness connected to each other and a portion near the one end of the insulating coating and is covered with a protective tube, and includes an anaerobic fixing agent. A waterproofing agent for a harness characterized by that.   The waterproofing agent for harness according to claim 4, wherein the anaerobic fixing agent is a methacrylate ester-based fixing agent. It has a plurality of electric wires having a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire, and an exposed end exposed from one end of the insulating coating of each of the core wires of the plurality of electric wires is Wire harnesses connected to each other,
A protective tube that covers a terminal portion including the exposed end and a portion near the one end of the insulating coating;
A waterproof harness comprising: an anaerobic fixing agent filled in a gap between the conductor wires in the terminal portion.   The waterproof harness according to claim 6, wherein the anaerobic fixing agent is a methacrylic ester-based fixing agent. Preparation for preparing a wire harness having a core wire composed of a plurality of conductor strands and an insulation coating surrounding the core wire, and having an electric wire in which an exposed portion exposed from the middle of the insulation coating is formed on the core wire Process,
A state in which a damming portion composed of the exposed portion and a portion in the vicinity of the exposed portion of the insulating coating is inserted into a heat-shrinkable protective tube, and in a gap between the conductor wires in the damming portion And a waterproof treatment step of heat-shrinking the protective tube in a state in which the anaerobic fixing agent is infiltrated. The waterproofing process includes
A dipping step of immersing the damming portion in the anaerobic fixing agent to infiltrate the anaerobic fixing agent into the gap between the conductor strands;
An insertion step of inserting the damming portion after being immersed in the anaerobic fixing agent into a heat-shrinkable protective tube;
9. The waterproofing according to claim 8, further comprising: a heating step of heating the protective tube in a state where the damming portion is inserted to contract the protective tube and harden the anaerobic fixing agent. A method for manufacturing a harness.   9. The method for manufacturing a waterproof harness according to claim 8, wherein the anaerobic fixing agent is a methacrylate ester-based fixing agent.   The exposed wire harness comprising: a core wire comprising a plurality of conductor wires; and an insulation coating surrounding the core wire, the wire harness having an electric wire formed with an exposed portion exposed from the middle of the insulation coating. And a waterproofing agent for a harness that waterproofs a damming portion that is covered with a protective tube, and is made of an anaerobic fixing agent. Agent.   The waterproofing agent for harness according to claim 11, wherein the anaerobic fixing agent is a methacrylic ester-based fixing agent. A wire harness comprising a core wire composed of a plurality of conductor strands and an insulating coating surrounding the core wire, the core wire including an electric wire having an exposed portion exposed from the middle of the insulating coating,
A protective tube that covers the damming portion composed of the exposed portion and a portion of the insulating coating near the exposed portion;
A waterproof harness comprising an anaerobic fixing agent filled in a gap between the conductor wires in the damming portion.   14. The waterproof harness according to claim 13, wherein the anaerobic fixing agent is a methacrylate ester-based fixing agent.

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