JP5800200B2 - Electric wire with terminal and manufacturing method thereof - Google Patents

Description

  The present invention relates to an electric wire with a terminal and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, a terminal-attached electric wire in which an electric wire and a terminal are electrically connected by crimping a barrel formed on the terminal so as to be wound from the outside to a core wire exposed from the electric wire is known. The core wire is formed by twisting a plurality of metal strands.

  When an oxide film is formed on the surface of the strands constituting the core wire, there is a concern that the electrical resistance between the core wire and the terminal or the electrical resistance between the strands increases. In order to reduce the electrical resistance, it is conceivable to break the oxide film on the surface of the strand by winding the barrel with a high pressure around the core. As a result, it was expected that the oxide film formed on the surface of the strands was broken to expose the new surfaces of the strands, and that the new surfaces contact each other or between the new surfaces and the terminals.

  However, according to the above method, since the cross-sectional area of the core wire is greatly reduced, the mechanical strength, particularly the tensile strength against an impact load (more specifically, the strength with which the crimp terminal holds the electric wire) is lowered. In particular, when the core wire is made of aluminum, it is known that in order to destroy the oxide film on the surface of the wire, it must be crimped with a higher compression than the copper core wire. There is a problem of wire breakage, and in order to prevent the wire breakage, it is desirable to perform pressure bonding with as low compression as possible.

  In order to solve the above problem, Patent Document 1 discloses a technique in which an extension piece extending outward in the axial direction of an electric wire is formed on an end edge portion of a barrel and folded back to a contact surface of a core wire of the barrel. . By adopting such a configuration, it is possible to give a difference in compression rate with respect to the core wire before and after the axial direction of the electric wire of the barrel, ensuring the mechanical strength of the electric wire with terminal, and between the electric wire and the terminal. A reduction in electrical resistance can be achieved at the same time.

JP 2010-62097 A

  However, in the configuration in which the thickness is varied only in a part in the circumferential direction of the crimping portion as described above, a force is intensively applied to a portion where the thickness is thin in the circumferential direction at the time of crimping, and the core wire after the crimping is in the radial direction. A homogeneous state could not be achieved.

  This invention was completed based on the above situations, Comprising: It aims at providing the electric wire with a terminal which can make favorable electrical performance and the retention strength of an electric wire (core wire) compatible, and its manufacturing method. To do.

  This invention made in order to solve the said subject is equipped with the electric wire containing a core wire, and the terminal crimped | bonded to the said core wire exposed from the edge part of the said electric wire, The said terminal is a baseplate in which the said core wire is mounted. A pair of barrels extending laterally from both side portions of the bottom plate and crimped so as to wrap around the core wire placed on the bottom plate, and extending in the length direction from one end portion of the bottom plate. A terminal-attached electric wire provided with a connection portion connected to a counterpart terminal, wherein the connection portion side in the width direction of the pair of barrels is substantially thicker over the entire circumference than the opposite side. It is formed and is a high compression part with respect to the core wire, and the side opposite to the connection part in the width direction of the pair of barrels is formed thinner than the connection part side over the entire circumference. Where it is considered as a low compression part for the core wire Having the features.

  According to the above-described electric wire with a terminal of the present invention, the connecting portion side in the width direction of the pair of barrels (the axial direction of the electric wire) is thicker than the opposite side, and the core wire is highly compressed. In this part, the oxide film formed on the surface of the core wire is firmly broken when the core wire of the barrel is caulked, and the core wires and the core wire and the barrel have good conductivity. State. In addition, since the thickened portion extends over the entire circumference, the core wire is pressed with almost uniform force from any direction during crimping, so the core wire after crimping is made uniform in the radial direction. be able to.

  On the other hand, the side opposite to the connection part in the width direction of the pair of barrels (the axial direction of the electric wire) is made thinner over the entire circumference compared to the connection part side, so that the core wire is in a low compression state (low compression Part). Therefore, in this part, the holding force with respect to the core wire of the barrel can be increased.

  In particular, at the boundary portion between the high compression portion and the low compression portion, the core wires are strongly rubbed against each other, so that the oxide film is broken and the core wires are reliably electrically connected.

  In addition, as a specific configuration in which the thicknesses of the pair of barrels are different in the width direction, there is a configuration in which a plate-shaped core is superimposed on the barrel. According to such a configuration, the conventional terminal is used, the core is superimposed on the bottom plate and the barrel, and the barrel is simply crimped to the core wire as usual, so a new manufacturing apparatus is not required and good. Thus, it is possible to obtain a terminal-attached electric wire that can be manufactured at a low cost while ensuring both a sufficient electrical conductivity and an electric wire (core wire) holding force. Furthermore, by adjusting the thickness, number of sheets, and width of the core, the thickness and width of the portion to be crimped to the core wires of the barrel and the bottom plate can be easily changed.

  Further, by setting the corner of the side opposite to the connecting portion in the width direction of the core as an inclined surface along the length direction, it is possible to prevent the core wire from being cut by a step.

  The compression ratio of the high compression portion is preferably set to be smaller than 50%, more preferably 35% or less, further preferably 25% or less, and particularly preferably 20% or less. By making the compression rate smaller than 50%, the oxide film on the core wire can be broken. If the compression rate is 35% or less, the surfaces of the strands constituting the core wire are microscopically adhered to each other, so that the electrical resistance value can be reduced. Furthermore, when the compression rate is 25% or less, the wires are macroscopically adhered to each other, so that the electrical resistance value can be further reduced. Furthermore, when the compression ratio is 20% or less, the strands can be securely adhered to each other, and thus the electrical resistance value can be reliably reduced.

  Moreover, it is preferable that the compression rate of a high compression part is larger than 50%, It is more preferable that it is 60 to 90%, It is especially preferable to set it as 70 to 80%. This is for ensuring the electric wire (core wire) holding force by making the compression ratio larger than 50%.

  The compression rate described above is defined as {(cross-sectional area of the conductor after compression) / (cross-sectional area of the conductor before compression)} × 100 (%). The compression rate is calculated by, for example, directly cutting the core wire before and after the barrel pressure bonding and measuring the cross-sectional area. In addition, the compression rate can be calculated from, for example, the height dimension of the barrel before and after the pressure bonding of the barrel.

  Further, the core may be temporarily fixed to the terminal bottom plate in advance. As a temporary fastening method, any method such as brazing, welding, and bonding, for example, forming a claw portion on one side and locking it to the other side locking portion can be adopted.

  Alternatively, the terminal is provided with a pair of core barrels extending sideways from both side portions of the bottom plate side by side on the connection portion side of the pair of barrels, and a crimped portion to be crimped to the core barrel on the core It is good also as a structure which fixes a core to a terminal by crimping the core barrel with respect to the to-be-bonded part of a core. In such a configuration, the conventional terminals cannot be used, but it is possible to fix the core (caulking the crimped part) and caulk the core wire with a single press, brazing In addition, a temporary fixing process such as welding or bonding is not necessary.

  In addition, by forming the length of the core slightly shorter than the length between both ends of the pair of barrels, when the pair of barrels are crimped so as to be wound around the core wire, It can be made clear without making the mating part and difficult to open.

  Furthermore, it is good also as a structure which an uneven | corrugated | grooved part provides in the surface which touches a core line among cores. The irregularities can be in any form such as grooves, protrusions, serrations, etc. With such a configuration, the oxide film formed on the surface of the core wire can be more easily broken and the conductivity can be increased. Is possible.

  According to the present invention, it is possible to achieve both better electrical performance and electric wire (core wire) holding power in the terminal.

The exploded perspective view of the electric wire with a terminal in reference example 1 of the present invention Similarly, perspective view with cores superimposed on terminals Similarly, side view of the electric wire with terminal Similarly, a sectional view of the bottom plate and a pair of barrels Sectional drawing which shows the state which overlapped the core on the bottom plate and a pair of barrels Similarly, conceptual diagram when crimping a pair of barrels to the core wire Similarly, a cross-sectional view of the high compression portion (A-A cross-sectional view of FIG. 3) Similarly, a cross-sectional view of the low compression section (a cross-sectional view taken along the line BB in FIG. 3). The exploded perspective view of the electric wire with a terminal in Embodiment 1 of the present invention The top view of the core Also side view of the core The back view of the core Similarly, a plan view with the core overlaid on the terminal Similarly, a perspective view of a state in which the crimping portion of the core is crimped by a barrel for crimping the core of the terminal Similarly, side view of the electric wire with terminal The perspective view of the core which concerns on other embodiment

< Reference Example 1 >
Reference Example 1 of the present invention will be described with reference to FIGS. As shown in FIG. 3, the electric wire with terminal 10 of this reference example includes an electric wire 13 including a core wire 11 and a female terminal 20 (an example of a terminal) that is crimped to the core wire 11 exposed from the end of the electric wire 13. It is to be prepared.

The electric wire 13 includes a core wire 11 formed by twisting a plurality of metal strands 60 and an insulating coating 12 made of a synthetic resin that covers the outer periphery of the core wire 11. The core wire 11 can use arbitrary metals as needed, such as aluminum, an aluminum alloy, copper, a copper alloy. In this reference example , aluminum or an aluminum alloy is used.

The female terminal 20 is generally used, and is formed by pressing a metal plate material into a predetermined shape. As the metal plate material, any metal such as copper or copper alloy can be used as necessary. In this reference example , copper or a copper alloy is used. Further, the metal plate material may be plated with an arbitrary metal such as tin or nickel. In this reference example , tin plating is applied.

  As shown in FIG. 1, the female terminal 20 has a bottom plate 21 on which the core wire 11 exposed on the end portion side of the electric wire 13 is placed, and a generally rectangular shape extending so as to rise from both side portions of the bottom plate 21. A pair of wire barrels 22, 22 (an example of a barrel), a pair of insulation barrels 23, 23 extended from both sides of the bottom plate 21 so as to stand up alongside the pair of wire barrels 22, 22, and a bottom plate 21, a connection portion 24 provided along the axial direction of the electric wire 13 from the end opposite to the insulation barrels 23, 23 and connected to a male terminal (not shown).

  The connecting portion 24 has a rectangular tube shape, and a male terminal can be inserted from the back side in FIG. 1 (the right back side in FIG. 1). An elastically deformable elastic contact piece 25 is provided inside the connecting portion 24 in a cantilevered manner, and the elastic contact piece 25 elastically contacts a male terminal (not shown), so that the male terminal and the female terminal 20 are provided. Are electrically connected. Further, a positioning stabilizer 28 is cut and raised in front of the lower end edge portion of the connection portion 24 (before the left side in FIG. 1).

  The bottom plate 21 and the pair of wire barrels 22, 22 are formed with a plurality of recesses 26 extending in a direction orthogonal to the axial direction of the electric wire 13 and spaced in the axial direction of the electric wire 13. The bottom plate 21 and the wire barrels 22 and 22 are a crimping portion 27 that is crimped to the core wire 11.

In this reference example , the core 15 is combined with such a conventional female terminal 20. As shown in FIG. 1, the core 15 has an elongated metal plate of the same type as the female terminal 20 at an angle that exactly overlaps the core plate 11 with the bottom plate 21 and the pair of wire barrels 22, 22 (crimp part 27) before crimping. It is a bent one. The length of the core 15 is slightly shorter than between the ends of the pair of wire barrels 22, 22, and the width is set to about ½ of the width of the wire barrel 22. As will be described later, the core 15 is used by being superimposed on the connection portion 24 side in the width direction of the wire barrel 22 (the axial direction of the female terminal 20).

Next, the manufacturing method of the electric wire 10 with a terminal of this reference example is demonstrated. First, the core 15 is overlaid on the crimping portion 27 of the female terminal 20. In this case, the position of the core 15 is set so as to be along the side edge of the wire barrel 22 on the side of the connecting portion 24. Accordingly, the core 15 is positioned closer to the connecting portion 24 in the width direction of the wire barrel 22 (the axial direction of the female terminal 20) (see FIG. 2).

  Next, pinpoint welding is performed by laser irradiation so that the core 15 does not move with respect to the female terminal 20 and temporarily fixed.

  Next, the core wire 11 exposed from the end of the electric wire 13 is placed on the bottom plate 21 of the female terminal 20, and the female terminal 20 is positioned on the anvil 30 of the crimping device as shown in FIG. The crimper 31 disposed above the terminal 20 is lowered. Accordingly, the pair of wire barrels 22 and 22 and the core 15 are bent and crimped so as to be wound around the core wire 11.

  At this time, since the core 15 is preliminarily overlaid on a part of the pair of wire barrels 22 and 22, the core wire 11 is in a state in which the compression rate differs depending on the position of the wire barrel 22. That is, as shown in FIG. 7, the core wire 11 is compressed around the wire barrel 22 and the core 15 in the wire barrel 22 near the connection portion 24, and thus is in a highly compressed state (high Compressor 11A). On the other hand, on the opposite side of the wire barrel 22 from the connecting portion 24, as shown in FIG. 8, since the core wire 11 is only compressed into the wire barrel 22, it is in a low compression state (the low compression portion 11B and To do).

  The compression rate of the core wire 11 in the high compression portion 11A is preferably set to be less than 50% and 35% in order to destroy the oxide film on the surface of the core wire 11 and to ensure good electrical performance with low electrical resistance. More preferably, it is more preferably 25% or less, and particularly preferably 20% or less.

  By making the compression rate smaller than 50%, the oxide film of the core wire 11 can be broken. Thereby, the electrical resistance value of the core wire 11 and the female terminal 20 can be made small. If the compression rate is 35% or less, the surfaces of the strands 60 constituting the core wire 11 are microscopically adhered to each other, so that the electrical resistance value can be reduced. Furthermore, when the compression rate is 25% or less, the strands 60 adhere macroscopically, so that the electrical resistance value can be further reduced. Furthermore, when the compression ratio is 20% or less, the strands 60 can be reliably adhered to each other, and thus the electrical resistance value can be reliably reduced.

  Further, the compression rate of the core wire 11 in the low compression portion 11B is preferably larger than 50% in order to prevent breakage of the core wire 11 and ensure a good electric wire (core wire) holding force, and is 60 to 90%. Is more preferable, and 70 to 80% is particularly preferable.

  In addition, since the length of the core 15 is set slightly shorter than the length between both ends of the pair of wire barrels 22 and 22, the abutting portions of the tip portions of the pair of wire barrels 22 and 22 are firmly crimped. Has been difficult to open. In other words, when the pair of wire barrels 22 and 22 are pressure-bonded so as to be wound around the core wire 11, it is possible to make the end portions of the pair of wire barrels 22 and 22 clear without making them open and difficult to open. It can be done.

As described above, according to this reference example , the crimp portion 27 has a configuration in which the compression ratio in the axial direction of the core wire 11 is different. The oxide film formed on the surface of the core wire 11 at the time of caulking 11 is firmly destroyed, the core wires 11 and the core wire 11 and the wire barrel 22 are brought into a good conductive state, On the opposite side (low compression portion 11B), it is possible to ensure the holding force of the wire barrel 22 against the core wire 11.

That is, according to the terminal-attached electric wire 10 of the present reference example , it is possible to ensure good electrical conductivity and the electric wire (only by adding a simple process of overlapping the core 15 while using the conventional female terminal 20 as it is. (Core wire) It becomes possible to ensure both holding power.

Further, according to the present reference example , the adjacent core wires 11 rub against each other strongly in the region between the high compression portion 11A and the low compression portion 11B, so that the oxide film formed on the surface of the core wire 11 is reliably obtained. Destroyed. Thereby, electrical connection between the adjacent strands 60 can be achieved.

<Embodiment 1 >
Embodiment 1 of the present invention will be described with reference to FIGS. The terminal-attached electric wire 40 of this embodiment is applied to an LA terminal 50 (an example of a terminal) as shown in FIG. 9, and the description of the portions overlapping with the reference example 1 will be omitted below.

  The LA terminal 50 of the present embodiment is formed by pressing a metal plate material such as copper or copper alloy into a predetermined shape, and a bottom plate 51 on which the core wire 11 exposed on the end side of the electric wire 13 is placed. And a pair of wire barrels 52 and 52 (an example of a barrel) having a substantially rectangular shape extending so as to rise from both sides of the bottom plate 51, and a pair of wire barrels 52 and 52 similarly from both sides of the bottom plate 51. A pair of insulation barrels 53, 53 extended so as to stand up at the end, and provided along the axial direction of the electric wire 13 from the end of the bottom plate 51 on the wire barrel 52 side, and connected to a terminal block and bolts (not shown). An annular connecting portion 54. Further, a pair of core barrels 58, 58 having a substantially rectangular shape are provided from the base portion 54 </ b> A of the connection portion 54 so as to rise side by side with the wire barrels 52, 52.

  The bottom plate 51 and the pair of wire barrels 52, 52 are formed with a plurality of recesses 56 extending in a direction orthogonal to the axial direction of the electric wire 13 and spaced in the axial direction of the electric wire 13. The bottom plate 51 and the wire barrels 52 and 52 are crimped portions 57 that are crimped to the core wire 11.

  The core 45 of the present embodiment is made of the same type of metal plate as the LA terminal 50, and as shown in the plan view of FIG. 10, the core body 46 and the crimped portion 47 are connected by a connecting portion 48. It is a member having an approximately H shape when viewed from above. As shown in FIG. 13, the length of the core body 46 is slightly shorter than between both ends of the pair of wire barrels 52, 52, and the width is about 1/3 of the width of the wire barrel 52. Is set to Further, in the core body 46, the corner portion on the side opposite to the connection portion 54 is chamfered along the length direction to form an inclined surface 46A. On the other hand, the length of the pressure-bonded portion 47 is formed to be substantially the same as the width of the base portion 54 </ b> A of the connection portion 54 extending from the bottom plate 51.

  As will be described later, the core 45 is used by being overlapped on the connection portion 54 side in the width direction of the wire barrel 52 (the axial direction of the LA terminal 50). As shown in FIG. 14, the bonded portion 47 is caulked to the LA terminal 50 by core barrels 58 and 58.

  Next, the manufacturing method of the electric wire 60 with a terminal of this embodiment is demonstrated. First, the core 45 is overlaid on the LA terminal 50. Specifically, the crimped portion 47 of the core 45 is overlapped with the base portion 54 </ b> A of the LA terminal 50, and the core body 46 is overlapped with the crimp portion 57. The core body 46 is disposed at a position near the connection portion 54 in the wire barrel 52.

  Next, so that the core 45 does not move relative to the LA terminal 50, the core barrels 58, 58 are deformed so as to fall toward the crimped portion 47, and the crimped portion 47 is caulked.

  Next, the core wire 11 exposed from the end of the electric wire 13 is placed on the bottom plate 51 of the LA terminal 50, and the pair of wire barrels 52 and 52 and the core body 46 are bent so as to be wound around the core wire 11. Then, the wire barrel 52 and the core body 46 are pressure-bonded to the core wire 11. Thereby, the electric wire 40 with a terminal is completed.

  According to the present embodiment, the core 45 can be temporarily fastened to the LA terminal 50 by a simple method of caulking the pressure-bonded portion 47 with the pair of core barrels 58 and 58.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above-described embodiment, the core 15 has a flat plate shape. However, for example, as shown in FIG. it can. Examples of the unevenness include a groove-like shape, a protrusion-like shape, serrations 19 and the like, and those having an edge so as to easily break the oxide film formed on the surface of the core wire are preferable.

  (2) In the above-described embodiment, the core is temporarily fixed to the terminal. However, the temporary fixing is not necessarily required.

(3) Moreover, the method of temporary fixing with respect to the terminal of a core is not restricted to spot welding, but other than brazing and bonding, for example, a claw portion is formed on one side and locked to the other side locking portion, etc. Any method can be employed. For example, in the embodiment 1, has formed the core barrel 58 to the LA terminal 50, the core 45 may be formed barrel for crimping the LA terminal 50.

  (3) In the above-described embodiment, one core is superimposed on the terminal. However, a plurality of cores may be stacked. In this case, the cores may not be the same size. For example, cores having different sizes (widths) may be overlapped in a step shape to change the thickness of the crimping portion.

  (4) Furthermore, it is also possible to employ a configuration in which the thickness of the crimping part is changed by using a single core having a different thickness in the width direction.

DESCRIPTION OF SYMBOLS 10, 40 ... Electric wire with terminal 11 ... Core wire 13 ... Electric wire 15, 45 ... Core 19 ... Serration (uneven part)
20 ... Female terminal (terminal)
21, 51 ... bottom plate 22, 52 ... wire barrel 24, 54 ... connection part 27, 57 ... crimping part 46 ... core body 46A ... inclined surface 47 ... pressure-bonded part 48 ... connecting part 50 ... LA terminal (terminal)
58 ... Barrel for core 60 ... Wire

Claims (16)

An electric wire including a core wire, and a terminal crimped to the core wire exposed from an end of the electric wire,
The terminal includes a bottom plate on which the core wire is placed, a pair of barrels that are laterally extended from both sides of the bottom plate and are crimped so as to be wound around the core wire placed on the bottom plate, A connecting portion extending in the length direction from one end portion of the bottom plate and connected to a counterpart terminal;
The connecting part side in the width direction of the pair of barrels is formed by stacking a plate-like core on the barrel, so that the thickness in the width direction of the barrel is increased over the entire circumference compared to the opposite side. It is formed and is a high compression part with respect to the core wire, and the side opposite to the connection part in the width direction of the pair of barrels is formed thinner than the connection part side over the entire circumference. It is a low compression part for the core wire ,
A crimped portion extending toward the connecting portion is formed on the core, and the core is crimped so as to be wound around the crimped portion at a position between the bottom plate and the connecting portion. An electric wire with a terminal, wherein a barrel is formed . The electric wire with a terminal according to claim 1, wherein a corner portion of the side opposite to the connection portion of the core is chamfered . The length of the said core is formed shorter than the length between the both ends of the said pair of barrels, The electric wire with a terminal of Claim 1 or Claim 2 characterized by the above-mentioned. The electric wire with a terminal according to any one of claims 1 to 3, wherein an uneven portion is provided on a surface of the core that is in contact with the core wire. The core wire includes a plurality of metal strands,
{(Cross sectional area of conductor after compression) / (Cross sectional area of conductor before compression)} × 100 (%) The compression ratio of the low compression portion is set to be larger than 50%. The terminal-attached electric wire according to any one of claims 1 to 4, wherein a compression ratio of the high compression portion is set to be smaller than 50% . The electric wire with a terminal according to claim 5 , wherein a compression rate of the high compression portion is set to 35% or less . The electric wire with a terminal according to claim 6 , wherein a compression rate of the high compression portion is set to 25% or less . The electric wire with a terminal according to claim 7 , wherein a compression ratio of the high compression portion is set to 20% or less . An electric wire including a core wire, and a terminal that is crimped to the core wire exposed from an end of the electric wire,
  The terminal includes a bottom plate, a pair of barrels extending laterally from both side portions of the bottom plate, and a connection portion extending in the length direction from one end portion of the bottom plate and connected to a counterpart terminal. A method of manufacturing an electric wire with a terminal comprising:
  Superimposing a plate-like core on the connecting portion side in the width direction of the bottom plate of the terminal and the pair of barrels;
The terminal is provided with a core barrel on the connection part side of the pair of barrels, and the core is provided with a portion to be crimped to be crimped to the core barrel. A step of crimping the core barrel against the portion to be crimped;
  Placing the core wire exposed from the electric wire on the bottom plate of the terminal and a core superimposed on the bottom plate;
  A step of winding and crimping the core overlapped with the pair of barrels and the pair of barrels around the core wire;
  The manufacturing method of the electric wire with a terminal characterized by performing these. The core wire includes a plurality of metal strands, and a compression ratio with respect to the core wire on the connection portion side in the width direction of the pair of barrels is smaller than 50%, and the side opposite to the connection portion The method for manufacturing a terminal-attached electric wire according to claim 9, wherein a compression ratio with respect to the core wire is larger than 50% . The manufacturing method of the electric wire with a terminal according to claim 10 with which the compression rate to the core wire by the side of said connecting part in the width direction of said pair of barrels is set as 35% or less . The manufacturing method of the electric wire with a terminal according to claim 11 with which the compression rate to the core wire by the side of said connecting part in the width direction of said pair of barrels is set as 25% or less . The method for manufacturing a terminal-attached electric wire according to claim 12, wherein a compression rate of the core wire on the connection portion side in the width direction of the pair of barrels is set to 20% or less . The method for manufacturing an electric wire with a terminal according to any one of claims 9 to 13, further comprising a step of temporarily fixing the core to a bottom plate of the terminal. The length of the said core is formed shorter than the length between the both ends of a pair of said barrel, The manufacturing method of the electric wire with a terminal as described in any one of Claim 9 thru | or 14 characterized by the above-mentioned. . The method for manufacturing a terminal-attached electric wire according to any one of claims 9 to 15, wherein an uneven portion is provided on a surface of the core that is in contact with the core wire .

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