JP2013196989A - Bonding structure for electric wires - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bonding structure for electric wires in which a bonding shape is easily formed and a junction part has a sufficient bonding strength, at bonding of core wires in a plurality of electric wires including an aluminum electric wire.SOLUTION: A bonding structure for electric wires comprises: a plurality of insulation electric wires 1 to each of which a bare core wire part 4 is formed; a welding part 3 at which the bare core wire parts 4 are welded with each other; and a bonding part 2 at which at least the bare core wire parts 4 are bonded with each other by a conductive adhesive agent 8. The plurality of insulation electric wires 1 include an aluminum electric wire having a core wire containing aluminum. In addition, the bare core wire part 4 is a part where the core wire is partially exposed from each insulation coating.

Description

  The present invention relates to a joint structure of a plurality of insulated wires including an aluminum wire having a core wire containing aluminum.

  In recent years, lightweight aluminum is being adopted as a material for core wires of electric wires that replace copper. Along with this, it may be necessary to join a core wire made of copper (copper wire) made of copper and a core wire containing aluminum (aluminum wire) by welding (patent) Reference 1).

JP 2010-1113946 A

  By the way, when the core wires containing aluminum (aluminum core wires) or the aluminum core wires and core wires made of other metals are joined by welding, the strength of the welded portion of the aluminum core wires is low, so the joint strength of the joint portions of the core wires is low. There was a problem that became low.

  With respect to this problem, in Patent Document 1 described above, the area of the welded portion between the aluminum core wire and the copper core wire is reduced by forming a joint surrounded by a copper core wire (copper core wire) around the aluminum core wire. As a result, the bonding strength of the bonding portion between the core wires is increased.

  However, the joint shape of the joint as shown in Patent Document 1 has a problem that the work of forming the joint is very complicated.

  The present invention has been made to solve the above-described problems, and in joining core wires in a plurality of electric wires including an aluminum electric wire, the bonding shape is easily formed and the bonding portion has sufficient bonding strength. It aims at providing the junction structure of the electric wire which has.

  The joining structure of the electric wire according to the first aspect of the present invention includes an aluminum electric wire having a core wire containing aluminum, and a plurality of insulations in which a bare core wire portion that is a portion where a portion of the core wire is exposed from each insulating coating is formed. In a part where at least the bare core wire portions in the plurality of insulated wires are bonded by a conductive adhesive, a welded portion that is a portion where the bare core wire portions in the plurality of insulated wires are welded to each other And an adhesive portion.

  The electric wire joining structure relating to the second aspect of the present invention is an aspect of the electric wire joining structure relating to the first aspect. In the electric wire joining structure relating to the second aspect of the present invention, the plurality of bare core wire portions are formed to extend in the same direction from the insulation coating at the end portions of the plurality of insulated wires, and the weld portion is The plurality of bare core wire portions are formed on the end side of the adhesive portion.

  The electric wire joining structure relating to the third aspect of the present invention is an aspect of the electric wire joining structure relating to the first aspect. The electric wire joining structure relating to the third aspect of the present invention is characterized in that at least a part of the adhesive portion is formed on the welded portion.

  The electric wire joining structure relating to the fourth aspect of the present invention is an aspect of the electric wire joining structure relating to the first aspect. In the electric wire joining structure according to the fourth aspect of the present invention, the bonding portion is a portion in which the bare core wire portions and the insulating coatings in the plurality of insulated wires are bonded by the conductive adhesive. It is characterized by.

  According to the electric wire joining structure relating to the first to fourth aspects of the present invention, in the joining of bare core wire portions in a plurality of insulated wires including aluminum wires, the joining portions of the plurality of bare core wire portions are welded portions, and conductive. It is possible to sufficiently increase the bonding strength of the bonded portion.

  Moreover, since a some bare core wire part is adhere | attached with an electroconductive adhesive agent, while improving the mechanical strength of a junction part, the electrical continuity between bare core wire parts is not suppressed.

  In particular, according to the electric wire joining structure relating to the second aspect of the present invention, when each insulated electric wire is pulled in a tearing direction, a tensile stress acts on an adhesive portion having a relatively high bonding strength. There is no tensile stress on the low weld. Therefore, the welded portion is effectively protected.

  In particular, according to the electric wire joining structure relating to the third aspect of the present invention, compared with the case where the welded portion and the adhesive portion are formed in different regions, the formation range of the adhesive portion can be widened, and as a result, a plurality of The joint strength of the joint portion of the bare core wire portion can be further increased.

  In particular, according to the electric wire joining structure according to the fourth aspect of the present invention, the bonding strength of the bonding portion is further increased by including the portion where the insulating coatings are bonded to each other by the conductive adhesive in the bonding portion.

It is a side view of the junction structure 10 of the electric wire regarding the 1st example of the embodiment of the present invention. It is a side view of 10 A of electric wire joining structures regarding the 2nd example of embodiment of this invention. It is a side view of the joining structure 10B of the electric wire regarding the 3rd example of embodiment of this invention. It is a figure which shows the formation procedure of the junction structure of the electric wire regarding embodiment of this invention. It is a figure which shows the formation procedure of the junction structure of the electric wire regarding embodiment of this invention. It is a figure which shows the formation procedure of the junction structure of the electric wire regarding embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<Embodiment>
<Configuration of the first example>
FIG. 1 is a side view showing an electric wire joining structure 10 according to a first example of the present embodiment.

  As shown in FIG. 1, the electric wire joining structure 10 includes a plurality of insulated electric wires 1, a welded portion 3, and an adhesive portion 2.

  The welded portion 3 is a portion where the bare core wire portions 4 of the insulated wires 1 are welded to each other. The bonding portion 2 is a portion where at least the bare core wire portions 4 are bonded to each other with a conductive adhesive. In the electric wire joining structure 10, at least the bare core wire portions 4 of the plurality of insulated electric wires 1 are joined by a joint portion including the welded portion 3 and the adhesive portion 2.

  Each insulated wire 1 is composed of a conductor (core wire) whose main component is a metal such as copper or aluminum, and an insulating coating covering the periphery of the conductor (core wire).

  Here, among the insulated wires 1 included in the wire bonding structure 10, at least one insulated wire 1 has a conductor (core wire) mainly composed of aluminum, such as aluminum or an alloy of aluminum. In the present embodiment, the case where there are two electric wires is illustrated and described for the sake of simplicity, but the number of electric wires is not limited to the case illustrated.

  The bare core wire portion 4 is a portion where the core wire is exposed from the insulation coating of each insulated wire 1. The bare core wire portion 4 is a part of the core wire included in the insulated wire 1. As shown in FIG. 1, the bare core wire portion 4 may be formed at the end of the insulated wire 1, or may be formed at another portion of the insulated wire 1, that is, at an intermediate portion of the insulated wire 1. Good. Further, in the case shown in FIG. 1, the bare core wire portion 4 is formed to extend in the same direction from the insulation coating at the end of each insulated wire 1. For example, the bare core wire portion 4 faces the insulation coating. It may be a case where it extends to the surface.

  The welded portion 3 is a portion formed by welding the bare core wire portions 4 to each other. Although the welded part 3 shown in FIG. 1 is formed on the terminal side of the bare core wire part 4, the welded part 3 does not necessarily have to be formed at the location. The location where the welded portion 3 is formed may be in the region where the bare core wire portion 4 is formed. As a welding method for forming the welded portion 3, for example, there is ultrasonic welding.

  The bonding portion 2 is a portion where at least the bare core wire portions 4 are bonded to each other with a conductive adhesive. Examples of the conductive adhesive for forming the bonding portion 2 include a silicone-based conductive adhesive and a polyamide-based conductive adhesive.

  Although not shown in FIG. 1, in the electric wire joining structure 10, the bare core wire portion 4 joined by at least the welded portion 3 and the adhesive portion 2 is an adhesive portion for the purpose of electrical insulation and dust prevention. The two are protected by being covered with a protective member such as an insulating tape so that each of the two is not exposed.

  In the electric wire joining structure 10 shown in FIG. 1, the welded portion 3 is formed closer to the end of the bare core wire portion 4 than the adhesive portion 2. In addition, in the electric wire joining structure 10 shown in FIG. 1, the welded portion 3 and the adhesive portion 2 are formed apart from each other, but may be formed in a state where they are in contact with each other.

  As shown above, when the welded portion 3 is formed on the end side of the bare core wire portion 4 rather than the bonded portion 2, when each insulated wire 1 is pulled in the direction of tearing them, the tensile stress is It acts on the adhesive portion 2 having a relatively high joint strength, and does not act on the welded portion 3. Therefore, the welded portion 3 having a relatively low joint strength is effectively protected. That is, the tear strength of the joint is improved. Moreover, the welding part 3 is effectively protected with a small amount of adhesive.

<Configuration of second example and third example>
Next, the electric wire joining structure 10A related to the second example and the electric wire joining structure 10B related to the third example will be described with reference to FIGS.

  In the electric wire joining structure 10 shown in FIG. 1, the welded portion 3 is formed closer to the end of the bare core wire portion 4 than the adhesive portion 2. On the other hand, the electric wire joining structure 10A relating to the second example shown in FIG. 2 and the electric wire joining structure 10B relating to the third example shown in FIG. 3 are different from the electric wire joining structure 10 shown in FIG. Have

  FIG. 2 is a side view showing an electric wire joining structure 10A according to the second example of the present embodiment.

  As shown in FIG. 2, the electric wire joining structure 10 </ b> A has an adhesive portion 2 </ b> A that is formed on the welded portion 3 </ b> A. In the case shown in FIG. 2, the bonding portion 2A is formed so as to overlap the entire welding portion 3A, but the bonding portion 2A may overlap a part of the welding portion 3A.

  In the electric wire joining structure 10A shown in FIG. 2, for example, after the bare core wire parts 4 are welded together to form the welded part 3A, a conductive adhesive is applied to the region including the welded part 3A. It is formed by forming 2A.

  As described above, the bonding portion 2A is formed so as to overlap the welding portion 3A, so that the formation range of the bonding portion 2A can be widened as compared with the case where the welding portion 3A and the bonding portion 2A are formed in different regions. As a result, it is possible to further increase the bonding strength of the bonding portion between the plurality of core wires.

  FIG. 3 is a side view showing an electric wire joining structure 10B according to the third example of the present embodiment.

  As shown in FIG. 3, the electric wire joining structure 10 </ b> B has an adhesive portion 2 </ b> B formed in a portion extending from the bare core wire portion 4 to the insulating coating in the insulated wire 1. That is, the bonding portion 2B has a portion where the bare core wire portions 4 are bonded to each other with a conductive adhesive and a portion where the insulating coatings are bonded to each other with a conductive adhesive.

  As described above, the bonding portion 2B is a portion where the bare core wire portions 4 and the insulating coatings are bonded to each other with a conductive adhesive, so that the bonding strength of the bonding portion between the core wires is further increased. Further, when an adhesive is applied to a location different from the welded portion, when welding is performed after bonding, the welding machine is not soiled and does not need to be cleaned, so that the workability of the welding process is improved.

<Formation procedure>
Next, the procedure for forming the electric wire joining structure 10 will be described with reference to FIGS. 4 to 6, which are diagrams showing the procedure for forming the electric wire joining structure 10.

  First, the insulation coating is removed at the end of each insulated wire 1, thereby forming a bare core wire portion 4 that is a portion exposed from the insulation coating in each core wire. As shown in FIG. 4, the plurality of insulated wires 1 are bundled in a state where the respective bare core wire portions 4 are arranged in parallel.

  Next, for example, a highly viscous liquid conductive adhesive 8 is dropped onto the bare core wire portion 4. Thereby, the adhesion part 2 is formed as shown in FIG.

  When the liquid conductive adhesive 8 as shown in FIG. 4 is used, the work efficiency is higher than that in the case where the insulated wire 1 is wound with a tape or the like and the insulating coatings of the insulated wire 1 are fixed to each other. Rise. Moreover, since the conductive adhesive 8 has conductivity, it increases the mechanical strength of the bonding between the bare core wire portions 4 and does not suppress the electrical conductivity between the bare core wire portions 4.

  Next, for example, as shown in the cross-sectional view of the bare core wire portion 4 in FIG. 6, the plurality of bare core wire portions 4 are ultrasonically welded together, thereby forming the weld portion 3 in FIG. 1 and the like.

  In ultrasonic welding, as shown in FIG. 6, for example, a plurality of bare core wire portions 4 are placed on a concave anvil 35, and the insulated wire 1 is fixed by a fixing jig (not shown). Thereafter, pressure is applied to the welding surface of the core wire by the welding horn 31, and vibration is applied to the plurality of bare core wire portions 4. In this manner, the welded portion 3 is formed, and the electric wire joining structure 10 is formed.

  In the forming procedure shown in FIGS. 4 to 6, the bonding portion 2 is formed in the stage (FIGS. 4 and 5) before the welding process (FIG. 6). Therefore, when shifting to a welding process or during the welding process, the arrangement of the bare core wire portions 4 becomes difficult to shift. Therefore, the welding part 3 is formed appropriately.

  When an aluminum core wire and a core wire (for example, a copper core wire) whose main component is a material such as another metal having a melting point higher than that of aluminum are welded, the plurality of bare core wire portions 4 are arranged as follows. It is desirable.

  That is, on the side that contacts the welding horn 31 that serves as a heat source (that is, in the upward direction in FIG. 6), the bare core wire portion 4 of an electric wire mainly composed of a material having a high melting point is disposed. That is, it is desirable that the bare core wire portion 4 of the electric wire whose main component is aluminum or the like having a low melting point is disposed in the downward direction of FIG. In this case, the output of the welding horn 31 is set to a sufficiently high output so that the bare core wire portion 4 made of a material having a high melting point can be welded.

  On the other hand, when the aluminum core wires are welded together, the output of the welding horn 31 is set to a relatively low output so that the bare core wire portion 4 of aluminum having a low melting point can be welded.

  Moreover, when the adhesion part 2 is formed in the stage before a welding process, it is thought that the conductive adhesive 8 which forms the adhesion part 2 may melt | dissolve and mix in the welding part 3, but it is conductive. Since the adhesive 8 has conductivity, the influence on the electrical continuity between the electric wires is suppressed.

  In addition, it is desirable to employ | adopt the procedure shown above for formation of the junction structure 10 of an electric wire, and the junction structure 10B of an electric wire. Further, in the formation of the electric wire joining structure 10 and the electric wire joining structure 10B, the welded portion 3 may be formed first, and then the adhesive portion 2 and the adhesive portion 2B may be formed. On the other hand, in the formation of the electric wire joining structure 10A, the welded portion 3A is formed first, and then the bonded portion 2A is formed.

<Effect>
According to the embodiment of the present invention, in the electric wire joining structure, the plurality of insulated wires 1 in which the bare core wire portions 4 are formed, the welded portion 3 that is a portion where the bare core wire portions 4 are welded together, and at least the bare core wire. The part 4 is provided with the adhesion part 2 which is the part adhere | attached by the conductive adhesive 8. FIG.

  The plurality of insulated wires 1 include an aluminum wire having a core wire containing aluminum. The bare core wire portion 4 is a portion where a part of the core wire is exposed from each insulation coating.

  According to such a wire joining structure 10, when joining the bare core wire portions 4 in the plurality of insulated wires 1 including aluminum wires, the joint portions of the plurality of bare core wire portions 4 are connected to the welded portion 3 and the conductive adhesive. By having the bonding portion 2 using 8, the bonding strength of the bonding portion can be sufficiently increased.

  Moreover, since the several bare core wire part 4 is adhere | attached with an electroconductive adhesive agent, the fall of the electrical continuity between electric wires by an adhesive agent intervening is suppressed.

  Further, when the liquid conductive adhesive 8 is dropped and bonded, workability is improved as compared with the case where the adhesive tape is wound and fixed.

  In the present invention, any component in the present embodiment can be modified or omitted within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Insulated electric wire 2,2A, 2B Bonding part 3,3A Welding part 4 Bare core wire part 8 Conductive adhesive 10, 10A, 10B Joining structure 31 Welding horn 35 Anvil

Claims (4)

A plurality of insulated wires, including an aluminum wire having a core wire containing aluminum, wherein a bare core wire portion is formed by exposing a portion of the core wire from each insulation coating;
A welded portion that is a portion where the bare core wire portions of the plurality of insulated wires are welded to each other;
The at least the bare core wire portions of the plurality of insulated wires include an adhesive portion that is a portion bonded by a conductive adhesive,
Wire connection structure. The plurality of bare core wire portions are formed to extend in the same direction from the insulation coating at the ends of each of the plurality of insulated wires,
The welded portion is formed on the terminal side of the plurality of bare core wire portions from the adhesive portion,
The electric wire joining structure according to claim 1. The adhesive part is formed to overlap at least a part of the welded part,
The electric wire joining structure according to claim 1. The bonding portion is a portion where the bare core wire portions and the insulating coatings in the plurality of insulated wires are bonded by the conductive adhesive,
The joining structure of the electric wire in any one of Claims 1-3.

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