JP2014157716A - Method for joining terminal and electric wire, and terminal for electric wire connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for joining a terminal and an electric wire in which, even if the terminal and the electric wire are different in material quality, while avoiding the occurrence of electric corrosion, the electric wire and the terminal are mechanically firmly joined to each other and also can be joined in an electrically stable state, and to provide the terminal for electric wire connection.SOLUTION: An electric wire 5 retained in a first caulking piece 6 is caulked under stress to which an external force is applied and electrically joined to a terminal 1 while the electric wire 5 retained in a second caulking piece 7 is soldered to the terminal 1 in a heated state under no stress to which the external force is not applied by energization to heating electrodes 10, 12 and the terminal 1 and the electric wire 5 are mechanically joined to each other. Moreover, the terminal 1 having quality different from that of the electric wire 5 has surface treatment for avoiding electric corrosion with the electric wire 5.

Description

  The present invention relates to a method for joining a terminal and a wire and a terminal for connecting a wire when the terminal is made of a material different from that of the wire.

  Conventionally, many wires made of copper or copper alloys are used as electric wires. On the other hand, aluminum or an aluminum alloy has good conductivity and is lighter and cheaper than copper or the like. Therefore, there are many advantages if aluminum or the like can be used for an electric wire.

  However, when aluminum or the like is used for the electric wire, it is necessary to join a copper or copper alloy terminal made of a different material. At this time, the electric wire may be corroded due to contact between the electric wire and the terminal. There is.

  For this reason, conventionally, as a watertight sealing structure in which the entire crimping part is hot-melt molded after the aluminum wire is crimped and connected to the terminal fitting, there is known a crimping connection structure with an improved anti-electrical function (for example, a patent Reference 1).

  On the other hand, a terminal structure that melts the insulation coating and joins the wire and the terminal by heating while pressing the wire covered with the insulation coating with a heating electrode (such as a fusing welding electrode or a resistance welding electrode) has been conventionally known. (For example, Patent Document 2).

JP 2006-286385 A JP 2000-277325 A

  However, as in Patent Documents 1 and 2, when a wire such as aluminum is joined to a terminal by pressure connection that pressurizes and heats the wire, the wire may be broken by the pressure because the strength is lower than copper or the like. There was a problem that mechanical bonding was weak. On the other hand, it is also necessary to ensure electrical connection by ensuring electrical continuity between the terminal and the electric wire.

  In addition, as in Patent Document 1, the use of a watertight sealing structure for preventing electrolytic corrosion increases the number of processes for joining terminals and wires, and makes the terminal structure complicated.

  The present invention is a terminal capable of mechanically and firmly joining an electric wire and a terminal while avoiding the occurrence of electrolytic corrosion even when the terminal and the electric wire are made of different materials and capable of being joined in an electrically stable state. An object of the present invention is to provide a method for joining a wire and a terminal for wire connection.

  In order to achieve the above object, a method for joining a terminal and an electric wire according to one configuration of the present invention is made of a material different from an electric wire obtained by bundling a plurality of stranded wires, and a connector portion and an electric wire that have been subjected to a surface treatment for avoiding electrical contact A terminal having a connecting portion is soldered to an electric wire at the electric wire connecting portion, and a first caulking piece that holds the electric wire under a stress with an external force applied to the electric wire connecting portion; A second caulking piece that is held under no stress that is not applied, the caulking pieces are arranged at a predetermined interval along the longitudinal direction of the electric wire, and the first caulking piece is caulked, thereby The terminal and the electric wire are electrically joined to each other under a stress applied with an external force by the first caulking piece, and the second caulking piece is caulked so that no external force is applied to the electric wire so as to be close to the electric wire. No stress on the wires In a heated state, by soldering the wire to the terminal flux and solder is introduced from the gap between the second crimping piece into the wire, mechanically-joining terminal and electric wire.

  According to this configuration, the electric wire held by the first caulking piece is caulked under a stress applied with an external force to increase the joining density of the stranded wires, thereby electrically joining the terminals, and the second By soldering the wire held on the crimped piece to the terminal while being heated under no stress where no external force is applied by energizing the heating electrode, the terminal strength is increased by increasing the bonding strength between the outer peripheral surface of the wire and the terminal. And mechanically join the wires. Moreover, the surface treatment for avoiding the electric contact with an electric wire is made | formed in the terminal of a material different from an electric wire. Therefore, even if the terminal and the electric wire are made of different materials, it is possible to bond the electric wire and the terminal mechanically and firmly in an electrically stable state while avoiding the occurrence of electrolytic corrosion.

  In the present invention, the electric wire located between the first caulking piece and the second caulking piece is further heated under a stress applied with an external force by the heating electrode, and the second caulking piece is placed on the second caulking piece. It is preferable that the stranded wires in the electric wire between the two caulking pieces are soldered with the flux and solder that has been thrown into the electric wire between the two caulking pieces. In this case, since the stranded wires are soldered between the two caulking pieces, the electric wire and the terminal can be mechanically bonded more firmly.

  The first and second caulking pieces each have an electric wire storage portion into which an electric wire is inserted, and the cross-sectional area of the electric wire storage portion of the first caulking piece is smaller than the cross-sectional area of the electric wire. It is also preferable that the cross-sectional area of the electric wire storage part of the crimped piece is formed larger than the cross-sectional area of the electric wire. In this case, the electric wire held by the first caulking piece can be easily caulked under stress, and the second caulking piece can be easily caulked under no stress so that no external force is applied to the electric wire. .

  Preferably, the electric wire is made of aluminum or an aluminum alloy, the terminal is made of copper or a copper alloy, and the surface is tin-plated. Therefore, even if the terminal and the electric wire are made of different materials, it is possible to bond the electric wire and the terminal mechanically and firmly in an electrically stable state while avoiding the occurrence of electrolytic corrosion.

  Preferably, the second caulking piece is provided with one or more penetrating portions penetrating the caulking piece. Therefore, the flow of the flux and the solder is improved through the penetration portion of the caulking piece, and the heat from the heating electrode is easily transmitted to the electric wire. The second caulking piece is provided with a cut-and-raising member for raising the bottom section. Accordingly, the contact surface between the caulking piece and the stranded wire is increased, and the heat from the heating electrode is easily propagated inside the stranded wire.

  The terminal for connecting the electric wire according to another configuration of the present invention is made of a material different from that of the electric wire in which a plurality of stranded wires are bundled, and the connector portion and the electric wire which are subjected to surface treatment for avoiding electric contact are connected by soldering. A wire connecting portion, wherein the wire connecting portion holds a first caulking piece for holding the electric wire under a stress applied with an external force and a second holding the electric wire under no stress to which an external force is not applied. Caulking pieces are provided, and the two caulking pieces are arranged at a predetermined interval along the longitudinal direction of the electric wire. When the first caulking piece is caulked, the terminal and the electric wire are electrically joined to each other under the stress applied by the external force by the first caulking piece, and the second caulking piece is applied to the electric wire by the external force. In the state where the wire is caulked so as not to be applied and is placed close to the wire, and the wire is heated under no stress by energizing the heating electrode, flux and solder are introduced into the wire from the gap with the second caulking piece, and the terminal By soldering the electric wire to the terminal, the terminal and the electric wire are mechanically joined.

  According to this configuration, the electric wire is caulked under a stress applied with an external force by the first caulking piece, the joining density between the stranded wires is increased, and the electric cabling is electrically joined to the terminal. The terminal is soldered to the terminal in a state where it is heated under no stress to which no external force is applied, thereby increasing the bonding strength between the surface of the stranded wire and the terminal, and the terminal and the electric wire are mechanically bonded. Moreover, the surface treatment for avoiding the electric contact with an electric wire is made | formed in the terminal of a material different from an electric wire. Therefore, even if the terminal and the electric wire are made of different materials, it is possible to bond the electric wire and the terminal mechanically and firmly in an electrically stable state while avoiding the occurrence of electrolytic corrosion.

  In this invention, the terminal and electric wire of a material different from an electric wire are electrically joined by the 1st crimping piece, and are mechanically joined by the 2nd crimping piece. In addition, the terminal is subjected to a surface treatment to avoid contact with the electric wire. As a result, even if the terminal and the electric wire are made of different materials, it is possible to bond the electric wire and the terminal mechanically and firmly in an electrically stable state while avoiding the occurrence of electrolytic corrosion.

(A) is a development view showing a terminal for electric wire connection according to the first embodiment of the present invention, (B) is a perspective view showing the terminal for electric wire connection, (C) is a connection state of the completed terminal and the electric wire. FIG. It is a perspective view which shows the joining state of a terminal and an electric wire. (A)-(C) are perspective views which show the modification of a 2nd crimping piece. It is a perspective view which shows the other modification of a 2nd crimping piece.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a connection state between terminals and electric wires according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a joined state between the terminal and the electric wire. As shown in FIG. 1A, the terminal 1 is made of a material different from that of the electric wire 5, and has a wire connecting portion 3 for connecting the connector portion 2 and the electric wire 5 by soldering. As shown in FIG. 1B, the wire connecting portion 3 has a first caulking piece 6 and a second caulking piece 7. As shown in FIG. 1C, the electric wire 5 is joined to the terminal 1 while being held by the electric wire connection portion 3. The connector portion 2 and the wire connection portion 3 are arranged along a direction that matches the longitudinal direction X of the wire 5.

  As shown in FIG. 2, for example, a heating electrode such as a fusing welding electrode is made of tungsten, and includes two upper electrodes 10 and 11 and one lower electrode 12. The electric wire 5 and the terminal 1 are heated by energizing each electrode while being sandwiched from above and below by the upper electrodes 10 and 11 and the one lower electrode 12.

  As shown in FIG. 1A, the electric wire 5 is made of, for example, a bundle of stranded wires made of aluminum or aluminum alloy, and the terminal 1 is made of a plate material of a copper alloy such as copper or brass made of a different material. The surface is tin-plated. Thereby, even if the terminal 1 and the electric wire 5 are different materials, the occurrence of electrolytic corrosion is avoided by the surface treatment of tin plating.

  The electric wire connecting portion 3 includes a first caulking piece 6 that holds the electric wire 5 under a stress applied with an external force, and a second caulking piece 7 that holds the electric wire 5 under an unstressed state where no external force is applied. . The first and second caulking pieces 6 and 7 have electric wire storage portions 8 and 9 into which the electric wires 5 as shown in FIG. 1B are inserted, which are formed by bending caulking pieces on both sides inward. The first and second caulking pieces 6 and 7 are provided at a predetermined interval along the longitudinal direction X of the electric wire 5, and the first caulking piece 6 is disposed on the distal end side of the electric wire 5. .

  As shown in FIG. 1B, the cross-sectional area A1 of the first caulking piece 6 electric wire storage portion 8 with respect to the cross-sectional area A of the electric wire 5 is set in the range of A1 ≦ 0.85A, for example. That is, there is no gap between the inner peripheral surface of the electric wire storage portion 8 of the first caulking piece 6 and the outer peripheral surface 5 a of the electric wire 5. At this time, by caulking the first caulking piece 6, the electric wire 5 is strongly pressed against the upper surface of the terminal 1, and the electric wire 5 is in a state under a stress to which an external force is applied by the first caulking piece 6. As a result, the stranded wires in the electric wire 5 are in close contact with each other without a gap, and the joining density between the stranded wires is increased, whereby the terminal 1 and the electric wire 5 are electrically and stably joined. The tip portion of the electric wire 5 made of aluminum or aluminum alloy is caulked by the first caulking piece 6 with the oxide film removed in advance.

  Since the electric wire 5 has some mechanical strength by being caulked by the first caulking piece 6, the terminal 1 does not fall out of the electric wire 5 before caulking the second caulking piece 7 during fusing welding. And can be used as a temporary stopper. After the second caulking piece 7 is caulked and the electric wire 5 is soldered, the second caulking piece 7 exclusively bears the mechanical strength, and the first caulking piece 6 has a mechanical burden. Almost does not take, and only bears the electrical connection.

  On the other hand, as shown in FIG. 1B, the cross sectional area A2 of the electric wire storage portion 9 of the second caulking piece 7 with respect to the cross sectional area A of the electric wire 5 is, for example, 1.01A ≦ A2 ≦ 1.05A. Set to range. That is, the state is set such that there is a gap between the inner peripheral surface of the electric wire storage portion 8 of the second caulking piece 7 and the outer peripheral surface of the electric wire 5 or a state in which the second caulking piece 7 is slightly in contact. At this time, the second caulking piece 7 is caulked so that no external force is applied to the electric wire 5 and is brought close to the electric wire 5, and the current amount and time to the fusing welding electrodes 10 and 12 are appropriately set as shown in FIG. In a state where the electric wire 5 is heated under no stress by controlled energization, flux and solder are introduced into the electric wire 5 from the gap between the second caulking piece 7 and the electric wire 5 is soldered to the terminal 1.

  In this case, the electric wire 5 is not firmly caulked and fixed by the caulking piece, but by loosely bending the caulking piece along the outer shape of the bundle of stranded wires, the inner circumferential surface of the caulking piece and the outer circumference of the electric wire 5 are In a state where a gap is formed between the surface 5 a and the wire 5, the wire 5 is held in a non-caulking state so as not to rattle in the wire connection portion 3. Moreover, it becomes easy to introduce flux and solder from this gap. Therefore, it is possible to prevent the electric wire 5 that is easily broken, such as aluminum, from being broken, and to perform appropriate soldering.

  As a result, flux and solder flow around the entire outer peripheral surface 5 a of the electric wire 5, increasing the bonding strength between the outer peripheral surface 5 a of the electric wire 5 and the terminal 1, and the terminal 1 and the electric wire 5 are mechanically firmly bonded. At this time, the second caulking piece 7 has a low electrical joint density because the flux and solder do not penetrate into the inside of the stranded wires, and exclusively bears the mechanical strength. The piece 6 exclusively bears the electrical connection.

  As shown in FIG. 2, the electric wire 5 positioned between the first and second caulking pieces 6 and 7 is sandwiched between the upper electrode 11 and the lower electrode 12 in the fusing welding electrode and pressed, and an external force is applied. Under the condition that the electrodes 11 and 12 are heated by energization, both the caulking pieces 6 and 7 are put into the second caulking piece 7 by flowing into the electric wire 5 between the caulking pieces 6 and 7 by the flux and solder. It is possible to solder the stranded wires in the electric wire 5 between the terminals 7 and mechanically join the terminal 1 and the electric wire 5 more firmly. Furthermore, a part of this flux and solder can also flow into the electric wire 5 in the first caulking piece 6 and solder between the stranded wires to improve the mechanical joint strength. In this case, the upper electrodes 10 and 11 and the lower electrode 12 may be energized at the same time or may be shifted in time.

  Thus, in the present invention, the electric wire held by the first caulking piece is caulked under a stress applied with an external force, the joining density of the stranded wires is increased, and it is electrically joined to the terminal. The wire held by the crimping piece is soldered to the terminal while being heated under no stress where no external force is applied by energizing the fusing welding to increase the bonding strength between the outer peripheral surface of the wire and the terminal, Join the wires mechanically. Moreover, the surface treatment for avoiding the electric contact with an electric wire is made | formed in the terminal of a material different from an electric wire. Therefore, even if the terminal and the electric wire are made of different materials, it is possible to bond the electric wire and the terminal mechanically and firmly in an electrically stable state while avoiding the occurrence of electrolytic corrosion.

  FIGS. 3A to 3C are perspective views showing modifications of the second caulking piece 7. The second caulking piece 7 is provided with one or more penetrating portions 15 penetrating the caulking piece 7. Other configurations are the same as those of the first embodiment. In FIG. 3A, a substantially L-shaped penetrating portion 15 </ b> A is provided on the top surface of the caulking piece 7 in a plan view. In this case, the fusing welding electrode can directly contact the electric wire 5. In FIG. 3B, a slit-like penetrating portion 15B is provided from the top surface to the side surface of the caulking piece 7. In FIG. 3C, a plurality of penetrating portions 15 </ b> C are provided on the top surface and the side surface of the caulking piece 7. Therefore, in these modified examples, the flow of the flux and the solder is improved through the penetrating portion 15 of the second caulking piece 7, and heat from the fusing welding electrode is easily transmitted to the electric wire 5.

  In addition, as shown in FIG. 4, the second caulking piece 7 is provided with a cut-and-raised member 16 for raising a section on the bottom surface. Therefore, the stranded wire approaches the inner peripheral surface of the caulking piece by the cut and raised member 16, the contact area between the second caulking piece 7 and the stranded wire increases, and the heat generated by the fusing welding electrode propagates to the inside of the stranded wire. It becomes easy to do.

  In each of the above embodiments, the electric wire is heated by the fusing welding electrode as the heating electrode, but may be heated by the resistance welding electrode.

1: Wire connection terminal 2: Connector portion 3: Wire connection portion 5: Electric wire 6: First caulking portion 7: Second caulking portion 8: Electric wire housing portion 9 of the first caulking portion: Second caulking Wire storage part 10: upper electrode (heating electrode)
11: Upper electrode (heating electrode)
12: Lower electrode (heating electrode)
15: penetration part 16: cut and raised member

Claims (7)

A method of joining a terminal and an electric wire by soldering a terminal having a connector part and an electric wire connection part made of a different material from an electric wire bundled with a plurality of stranded wires to an electric contact avoidance to the electric wire at the electric wire connection part Because
The wire connecting portion is provided with a first caulking piece for holding the electric wire under a stress applied with an external force and a second caulking piece for holding the electric wire under no stress without applying an external force. Arranged at predetermined intervals along the longitudinal direction of
By caulking the first caulking piece, the terminal and the electric wire are electrically joined to each other under a stress applied with an external force by the first caulking piece,
The second caulking piece is caulked so that an external force is not applied to the electric wire, is brought close to the electric wire, and the electric wire is heated from the gap with the second caulking piece while the electric wire is heated under no stress by energizing the heating electrode. A method of joining a terminal and an electric wire by mechanically joining the terminal and the electric wire by injecting flux and solder into the terminal and soldering the electric wire to the terminal. The claim 1, further comprising:
The electric wire located between the first caulking piece and the second caulking piece is heated under a stress applied with an external force by the heating electrode, and is put into the second caulking piece to be both caulking pieces. The joining method of a terminal and an electric wire which solders the strand wires in the electric wire between both crimping pieces with the flux and solder which flowed into the electric wire between. In claim 1 or 2,
Each of the first and second caulking pieces has an electric wire storage portion into which an electric wire is inserted, and the cross-sectional area of the electric wire storage portion of the first caulking piece is smaller than the cross-sectional area of the electric wire, and the second caulking piece A method of joining a terminal and an electric wire, wherein the cross-sectional area of the electric wire storage portion is larger than the cross-sectional area of the electric wire. In any one of Claim 1 to 3,
A method for joining a terminal and an electric wire, wherein the electric wire is made of aluminum or an aluminum alloy, the terminal is made of copper or a copper alloy, and a surface thereof is tin-plated. In any one of Claims 1-4,
The terminal and electric wire joining method, wherein the second caulking piece is provided with one or more penetrating portions penetrating the caulking piece. In any one of Claims 1-4,
A method for joining a terminal and an electric wire, wherein the second caulking piece is provided with a cut-and-raised member for raising a section at the bottom. A wire connecting terminal having a connector part and a wire connecting part to which the electric wire is connected by soldering, made of a material different from the wire bundled with a plurality of stranded wires, and subjected to a surface treatment for avoiding electrical contact,
The electric wire connecting portion includes a first caulking piece for holding the electric wire under a stress applied with an external force and a second caulking piece for holding the electric wire under no stress without applying an external force. Arranged at predetermined intervals along the longitudinal direction of the electric wire,
When the first caulking piece is caulked, the terminal and the electric wire are electrically joined to each other under a stress applied with an external force by the first caulking piece,
The second caulking piece is caulked so that an external force is not applied to the electric wire, is brought close to the electric wire, and the electric wire is energized to heat the electric wire under no stress, and from the gap with the second caulking piece. A terminal for connecting an electric wire, in which flux and solder are put into the electric wire and the electric wire is soldered to the terminal to mechanically join the terminal and the electric wire.

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