Electric wire with terminal and method for manufacturing electric wire with terminal

Abstract

To provide an electric wire with a terminal which can improve the mechanical connection strength of a first electric wire and a second electric wire to a crimp terminal.SOLUTION: An electric wire 1 with a terminal includes a first electric wire 10, a second electric wire 20, and a crimp terminal 30. The cross-sectional area of a first conductor 11 is larger than the cross-sectional area of a second conductor 21. The second conductor 21 is arranged between the first conductor 11 and a bottom plate 36 of a conductor crimp part 32. The conductor crimp part 32 is fastened so that the edges of a pair of conductor fastening pieces 37 intrude into the first conductor 11.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an electric wire with a terminal and a method for manufacturing an electric wire with a terminal. [Background technology]

[0002] A typical automotive wire harness includes multiple electric wires with terminals. The electric wires with terminals include electric wires and crimp terminals crimped to the conductors of the electric wires, and the crimp terminals of the electric wires with terminals are housed in terminal housings. Normally, one electric wire is crimped to a crimp terminal, but depending on the structure of the vehicle system, multiple electric wires may be crimped to one crimp terminal.

[0003] Patent Document 1 discloses a method for crimping a terminal, in which a crimper crimps two electric wires by wrapping one barrel over the other barrel, thereby crimping the terminal and the electric wire. Specifically, in the crimping method, before the crimper starts crimping the pair of barrels, the position of the electric wire between the pair of barrels is restricted by the electric wire presser, and an allowable space is secured for the tip of one barrel to enter under the other barrel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-87009 Summary of the Invention [Problem to be solved by the invention]

[0005] The conductor area of ​​an automotive wire harness is determined by the required power based on the performance requirements of auxiliary devices in the vehicle system, and is appropriately selected according to the melting characteristics of the fuse that protects the circuit. However, when electric wires with different conductor areas are crimped to a crimp terminal, the mechanical connection strength of the electric wire to the crimp terminal may not be sufficient.

[0006] The present invention has been made in view of the problems inherent in the conventional techniques, and an object of the present invention is to provide an electric wire with a terminal and a method for manufacturing an electric wire with a terminal that can improve the mechanical connection strength of the first electric wire and the second electric wire to the crimp terminal. [Means for solving the problem]

[0007] An electric wire with terminal according to an embodiment of the present invention includes a first electric wire including a first conductor and a first insulating coating that covers the first conductor. The electric wire with terminal includes a second electric wire including a second conductor and a second insulating coating that covers the second conductor. The electric wire with terminal includes a conductor crimping portion that crimps the first conductor and the second conductor, and the conductor crimping portion includes a crimp terminal including a bottom plate and a pair of conductor crimping pieces that are connected to the bottom plate and crimp the first conductor and the second conductor. The cross-sectional area of ​​the first conductor is larger than the cross-sectional area of ​​the second conductor. The second conductor is disposed between the first conductor and the bottom plate of the conductor crimping portion. The conductor crimping portion is crimped so that tips of the pair of conductor crimping pieces bite into the first conductor.

[0008] A method for manufacturing an electric wire with terminal according to another aspect of the present invention includes a step of preparing a first electric wire, a second electric wire, and a crimp terminal. The first electric wire includes a first conductor and a first insulating coating that covers the first conductor. The second electric wire includes a second conductor and a second insulating coating that covers the second conductor. The crimp terminal includes a conductor crimping portion that crimps the first conductor and the second conductor, and the conductor crimping portion includes a bottom plate and a pair of conductor crimping pieces that are connected to the bottom plate and crimp the first conductor and the second conductor. The method for manufacturing an electric wire with terminal includes a step of adjusting the positions of the first conductor and the second conductor with respect to the crimp terminal so that the second conductor is disposed between the first conductor and the bottom plate of the conductor crimping portion. The method for manufacturing an electric wire with terminal includes a step of crimping the conductor crimping portion so that tips of the pair of conductor crimping pieces bite into the first conductor, and crimping the first conductor and the second conductor to the conductor crimping portion. The cross-sectional area of ​​the first conductor is larger than the cross-sectional area of ​​the second conductor. Effect of the Invention

[0009] According to the present invention, it is possible to provide an electric wire with a terminal and a method for manufacturing an electric wire with a terminal that can improve the mechanical connection strength of the first electric wire and the second electric wire to the crimp terminal. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a side view showing an example of an electric wire with a terminal according to the present embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] 4 is a perspective view showing a state before the positions of a first electric wire and a second electric wire are adjusted relative to the crimp terminal. FIG. [Diagram 5] 11 is a cross-sectional view showing a state in which the positions of the first electric wire and the second electric wire are adjusted with respect to the crimp terminal and the crimper starts to move down. FIG. [Figure 6] 4 is a cross-sectional view showing a state in which a first electric wire and a second electric wire are crimped to a crimp terminal. FIG. [Figure 7] 4 is a cross-sectional view showing a state after the first electric wire and the second electric wire are crimped to the crimp terminal. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the electric wire with terminal and the manufacturing method thereof according to the present embodiment will be described in detail with reference to the drawings. Note that the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may differ from the actual ratios.

[0012] [Terminal wire] First, the electric wire with terminal 1 according to the present embodiment will be described with reference to Figs. 1 to 3. Fig. 1 is a side view showing an example of the electric wire with terminal 1 according to the present embodiment. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1. As shown in Figs. 1 to 3, the electric wire with terminal 1 according to the present embodiment includes a first electric wire 10, a second electric wire 20, a crimp terminal 30, and a corrosion-resistant coating 40.

[0013] The first electric wire 10 includes a first conductor 11 and a first insulating coating 12 that covers the first conductor 11. The first conductor 11 includes a plurality of first strands 13. The second electric wire 20 includes a second conductor 21 and a second insulating coating 22 that covers the second conductor 21. The second conductor 21 includes a plurality of second strands 23.

[0014] The first conductor 11 may include a bunched stranded wire formed by bundling a plurality of first strands 13. The second conductor 21 may include a bunched stranded wire formed by bundling a plurality of second strands 23. The first conductor 11 and the second conductor 21 may each be composed of only one twisted wire, or may be a composite twisted wire in which a plurality of bunched twisted wires are twisted together. The configurations of the first conductor 11 and the second conductor 21 may be the same or different.

[0015] The main component of at least one of the first conductor 11 and the second conductor 21 may be copper or aluminum. The main component of the first conductor 11 means the metal with the highest molar ratio among the metals contained in the first conductor 11. Similarly, the main component of the second conductor 21 means the metal with the highest molar ratio among the metals contained in the second conductor 21. The first conductor 11 may contain the main component at a molar ratio of 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, or 95% or more. Similarly, the second conductor 21 may contain the main component at a molar ratio of 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, or 95% or more. The material of the first conductor 11 and the second conductor 21 may be, for example, copper, aluminum, or an alloy containing these metals. From the viewpoint of weight reduction, the first conductor 11 and the second conductor 21 are preferably formed of aluminum or an aluminum alloy.

[0016] The main component of the first conductor 11 may be the same as the main component of the second conductor 21. This can suppress galvanic corrosion caused by dissimilar metals. For example, the main component of the first conductor 11 may be aluminum, and the main component of the second conductor 21 may be aluminum. This can reduce the weight of the electric wire with terminal 1.

[0017] The main component of the first conductor 11 may be different from the main component of the second conductor 21. For example, the main component of the first conductor 11 may be aluminum, and the main component of the second conductor 21 may be copper. In recent years, from the viewpoint of weight reduction, replacement of copper electric wires with aluminum electric wires has been considered, but in the electric wire with terminal 1 according to this embodiment, it is also possible to crimp a copper electric wire and an aluminum electric wire for reasons of circuit configuration.

[0018] The cross-sectional area of ​​the first conductor 11 is larger than the cross-sectional area of ​​the second conductor 21. This makes it possible to suppress a decrease in the mechanical connection strength of the first electric wire 10 and the second electric wire 20 to the crimp terminal 30, even when the conductor crimping portion 32 is crimped so that the tips of the pair of conductor crimping pieces 37 bite into the first conductor 11. The cross-sectional area of ​​the first conductor 11 may be 1.5 times or more, 2 times or more, 2.5 times or more, 3 times or more, 3.5 times or more, or 4 times or more the cross-sectional area of ​​the second conductor 21. The cross-sectional area of ​​the first conductor 11 may be 10 times or less, 8 times or less, 6 times or less, or 4 times or less the cross-sectional area of ​​the second conductor 21.

[0019] The cross-sectional area of ​​the first conductor 11 is three times or more the cross-sectional area of ​​the second conductor 21, and the first conductor 11 may be mainly composed of aluminum, and the second conductor 21 may be mainly composed of copper. In the electric wire with terminal 1 according to the present embodiment, even with such a configuration, it is possible to suppress a decrease in the mechanical connection strength of the first electric wire 10 and the second electric wire 20 to the crimp terminal 30.

[0020] The tensile strength of the second conductor 21 may be greater than the tensile strength of the first conductor 11. Even with this configuration, the electric wire with terminal 1 according to this embodiment can suppress a decrease in the mechanical connection strength of the first electric wire 10 and the second electric wire 20 to the crimp terminal 30. The tensile strength of the first conductor 11 is determined by the breaking strength per unit cross-sectional area (N / mm) when the first insulating coating 12 is stripped from a portion of the first electric wire 10 where the crimp terminal 30 is not crimped, and the exposed portion of the first conductor 11 is pulled and broken by a tensile tester. 2Similarly, the tensile strength of the second conductor 21 is the breaking strength (N / mm2) per unit cross-sectional area when the second insulating coating 22 is stripped from the portion of the second electric wire 20 where the crimp terminal 30 is not crimped, and the exposed portion of the second conductor 21 is pulled and broken by a tensile tester. 2 ).

[0021] The wire diameter of each of the first wires 13 may be substantially the same as the wire diameter of each of the second wires 23. Here, the wire diameter of the first wires 13 and the wire diameter of the second wires 23 being substantially the same means that the wire diameter of the first wires 13 is −10% or more and +10% or less of the wire diameter of the second wires 23. In this case, the first wires 13 and the second wires 23 can be uniformly crimped to the crimp terminal 30, and therefore a decrease in the mechanical connection strength of the first electric wire 10 and the second electric wire 20 to the crimp terminal 30 can be suppressed.

[0022] Thermoplastic resins capable of ensuring electrical insulation can be used as the materials for the first insulating coating 12 and the second insulating coating 22. The materials for the first insulating coating 12 and the second insulating coating 22 may each contain, for example, at least one of an olefin-based resin and polyvinyl chloride. The olefin-based resin may contain, for example, at least one resin selected from the group consisting of polyethylene (PE), polypropylene (PP), an ethylene copolymer, and a propylene copolymer.

[0023] The crimp terminal 30 includes an electrical connection portion 31, a conductor crimping portion 32, a coating crimping portion 33, a front joint portion 34, and a rear joint portion 35.

[0024] The electrical connection part 31 is provided at the front in the longitudinal direction of the crimp terminal 30 and is configured to be connected to a terminal on the mating connector side. The electrical connection part 31 is box-shaped and has a spring piece built therein that engages with the mating terminal.

[0025] The conductor crimping portion 32 is provided rearward of the electrical connection portion 31 in the longitudinal direction of the crimp terminal 30, and crimps the exposed first conductor 11 at the end of the first electric wire 10 and the exposed second conductor 21 at the end of the second electric wire 20. The conductor crimping portion 32 is in direct contact with the first conductor 11 and the second conductor 21. The conductor crimping portion 32 includes a bottom plate 36 on which the second electric wire 20 is placed, and a pair of conductor crimping pieces 37 connected to the bottom plate 36 and for radially wrapping and crimping the first conductor 11 and the second conductor 21.

[0026] Here, the cross-sectional area of ​​the first conductor 11 is larger than that of the second conductor 21, and even if the tip of the conductor clamping piece 37 bites into the first conductor 11, it is more difficult to cut than the second conductor 21. On the other hand, the cross-sectional area of ​​the second conductor 21 is smaller than that of the first conductor 11, and if the tip of the conductor clamping piece 37 bites into the second conductor 21, there is a risk of affecting the mechanical connection strength of the first electric wire 10 and the second electric wire 20 to the crimp terminal 30. Therefore, the conductor crimping portion 32 is crimped so that the tips of the pair of conductor clamping pieces 37 bite into the first conductor 11. By causing the tips of the pair of conductor clamping pieces 37 to bite into the first conductor 11, the mechanical connection with the first conductor 11, which has a larger cross-sectional area, can be strengthened. In addition, it is possible to prevent the tip of the conductor clamping piece 37 from biting into the second conductor 21, which has a smaller cross-sectional area, and thus the second conductor 21 from being excessively compressed.

[0027] Moreover, the second conductor 21 is disposed between the first conductor 11 and the bottom plate 36 of the conductor crimping portion 32. Specifically, the first conductor 11 and the second conductor 21 are aligned vertically, with the first conductor 11 being disposed on the upper side. Therefore, the tip of the conductor clamping piece 37 is unlikely to bite into the second conductor 21, and excessive compression of the second conductor 21 is suppressed. Furthermore, the above configuration can suppress the first conductor 11 and the second conductor 21 from being aligned horizontally. As a result, for example, when the conductor clamping piece 37 is not clamped symmetrically, excessive compression of the second conductor 21 having a small cross-sectional area can be suppressed.

[0028] The cover crimping portion 33 is provided rearward of the conductor crimping portion 32 in the longitudinal direction of the crimp terminal 30, and crimps the first insulating cover 12 of the first electric wire 10 and the second insulating cover 22 of the second electric wire 20. The cover crimping portion 33 is in direct contact with the first insulating cover 12 at the end portion of the first electric wire 10 and the second insulating cover 22 at the end portion of the second electric wire 20. The cover crimping portion 33 includes a bottom plate 36 for placing the first electric wire 10, and a pair of cover crimping pieces 38 for radially wrapping and crimping the first electric wire 10 and the second electric wire 20. When the cover crimping portion 33 crimps the first insulating cover 12 and the second insulating cover 22 with the pair of cover crimping pieces 38, the first insulating cover 12 and the second insulating cover 22 are crimped to the crimp terminal 30 with the pair of cover crimping pieces 38 overlapping each other.

[0029] The front joint portion 34 connects between the electrical connection portion 31 and the conductor crimping portion 32 in the longitudinal direction of the crimp terminal 30. The front joint portion 34 includes a bottom plate 36 and a pair of side plates extending upward from both left and right edges of the bottom plate 36. The front joint portion 34 is formed in a generally U-shape in cross section by the bottom plate 36 and the pair of side plates.

[0030] The rear joint portion 35 connects between the conductor crimping portion 32 and the coating crimping portion 33 in the longitudinal direction of the crimp terminal 30. The rear joint portion 35 includes a bottom plate 36 and a pair of side plates extending upward from both left and right edge portions of the bottom plate 36. The rear joint portion 35 is formed in a generally U-shape in cross section by the bottom plate 36 and the pair of side plates.

[0031] In this embodiment, the crimp terminal 30 is formed by bending a single plate-like member. Therefore, the bottom plate 36 of the front electrical connection portion 31 and the bottom plate 36 of the coating crimping portion 33 are formed continuously as a single common bottom plate 36. In addition, the front and rear ends of the low-profile side plate of the front joint portion 34 are formed continuously with the rear end of the side plate of the electrical connection portion 31 and the lower half of the front end of the pair of conductor crimping pieces 37 of the conductor crimping portion 32, respectively. The front and rear ends of the low-profile side plate of the rear joint portion 35 are formed continuously with the rear end of the pair of conductor crimping pieces 37 of the conductor crimping portion 32 and the lower half of the front end of the pair of coating crimping pieces 38 of the coating crimping portion 33, respectively.

[0032] A metal having high electrical conductivity can be used as the material of the crimp terminal 30. The material of the crimp terminal 30 may be, for example, copper, a copper alloy, stainless steel, gold-plated copper, silver-plated copper, tin-plated copper, a tin-plated copper alloy, or tin-plated stainless steel.

[0033] The anticorrosive material 40 is provided at the joint between the first conductor 11 and the crimp terminal 30. If the first conductor 11 of the first electric wire 10 and the crimp terminal 30 are made of different materials, corrosion is likely to occur at the joint due to the difference in ionization tendency. Therefore, by providing the anticorrosive material 40 at the joint, the occurrence of corrosion can be suppressed. However, even if the materials of the first conductor 11 and the crimp terminal 30 are both aluminum or both copper, for example, corrosion may occur. Therefore, from the viewpoint of corrosion prevention, it is preferable that the electric wire with terminal 1 is provided with the anticorrosive material 40. The anticorrosive material 40 may be, for example, a resin obtained by hardening at least one of a monomer and an oligomer.

[0034] [Manufacturing method of electric wire with terminal] Next, a method for manufacturing the electric wire with terminal 1 according to the present embodiment will be described with reference to Fig. 4 to Fig. 7. The method for manufacturing the electric wire with terminal 1 according to the present embodiment includes a preparation step, a conductor position adjustment step, a crimping step, and a corrosion prevention layer formation step.

[0035] The preparation step is a step of preparing the first electric wire 10, the second electric wire 20, and the crimp terminal 30, as shown in FIG.

[0036] The first electric wire 10 includes a first conductor 11 and a first insulating coating 12 that covers the first conductor 11. At an end of the first electric wire 10, the first insulating coating 12 is stripped away, and the first conductor 11 is exposed. The second electric wire 20 includes a second conductor 21 and a second insulating coating 22 that covers the second conductor 21. At an end of the second electric wire 20, the second insulating coating 22 is stripped away, and the second conductor 21 is exposed.

[0037] The crimp terminal 30 includes an electrical connection portion 31, a conductor crimping portion 32, a covering crimping portion 33, a front joint portion 34, and a rear joint portion 35. The conductor crimping portion 32 includes a bottom plate 36 and a pair of conductor crimping pieces 37 connected to the bottom plate 36 for crimping the first conductor 11 and the second conductor 21, and the pair of conductor crimping pieces 37 extend upward from both left and right edges of the bottom plate 36. Before crimping the first electric wire 10 and the second electric wire 20, the conductor crimping portion 32 is formed into a generally U-shaped cross section by the bottom plate 36 and the pair of conductor crimping pieces 37. The covering crimping portion 33 includes a pair of covering crimping pieces 38, and the pair of covering crimping pieces 38 extend upward from both left and right edges of the bottom plate 36. Before the first electric wire 10 and the second electric wire 20 are crimped, the covering crimping portion 33 is formed by a bottom plate 36 and a pair of covering crimping pieces 38 into a generally U-shaped cross section.

[0038] The conductor position adjustment process is a process of adjusting the positions of the first conductor 11 and the second conductor 21 relative to the crimp terminal 30 so that the second conductor 21 is positioned between the first conductor 11 and the bottom plate 36 of the conductor crimping portion 32, as shown in Figures 4 and 5.

[0039] In the conductor position adjustment step, specifically, a portion of the first conductor 11 of the first electric wire 10 where the first conductor 11 is exposed is inserted onto the bottom plate 36 of the crimp terminal 30 configured as described above. Also, a portion of the second conductor 21 of the second electric wire 20 where the second conductor 21 is exposed is inserted onto the exposed first conductor 11. As a result, the first conductor 11 and the second conductor 21 are placed on the upper surface of the bottom plate 36 of the conductor crimping portion 32, and the portion of the first electric wire 10 where the first insulating coating 12 is attached is placed on the upper surface of the bottom plate 36 of the coating crimping portion 33. Also, the portion of the second electric wire 20 where the second insulating coating 22 is attached is placed on the first insulating coating 12. The positions of the first electric wire 10 and the second electric wire 20 may be adjusted by clamping the first electric wire 10 and the second electric wire 20 with a clamping member (not shown).

[0040] The conductor crimping step is a step of crimping the conductor crimping portion 32 so that the tips of the pair of conductor crimping pieces 37 bite into the first conductor 11, and crimping the first conductor 11 and the second conductor 21 to the conductor crimping portion 32. In the conductor crimping step, crimping can be performed using a conductor crimping device 100 as shown in Figs. 4 and 5. The conductor crimping device 100 includes an anvil 110 and a wire crimper 120 that moves up and down relative to the anvil 110. The anvil 110 is a platform on which the crimp terminal 30 is placed, and supports the bottom plate 36 of the crimp terminal 30. The wire crimper 120 has a guide groove 121.

[0041] The guide groove 121 includes a protruding portion 122 and curved surfaces 123 provided on both ends of the protruding portion 122 in the short direction of the crimp terminal 30. The protruding portion 122 protrudes toward the anvil 110. The curved surfaces 123 are connected to the protruding portion 122, and are recessed toward the opposite side to the protruding direction of the protruding portion 122 and curved in an arc shape. The guide groove 121 is formed in an M shape by the protruding portion 122 and the curved surfaces 123 when viewed in the longitudinal direction of the crimp terminal 30.

[0042] As shown in FIG. 5, when the wire crimper 120 is lowered, the conductor crimping pieces 37 of the crimp terminal 30 are introduced into the guide grooves 121 .

[0043] 6, as the wire crimper 120 further descends, the pair of conductor clamping pieces 37 begin to curve along the curved surfaces 123. Then, the pair of conductor clamping pieces 37 bend inward so as to wrap around the first conductor 11 of the first electric wire 10 and the second conductor 21 of the second electric wire 20, and the tips of the pair of conductor clamping pieces 37 gradually approach the protrusions 122.

[0044] 7, when the wire crimper 120 is further lowered, the tips of the pair of conductor clamping pieces 37 butt against each other and are further guided by the protrusion 122 to change direction downward and bite into the first conductor 11. In this way, the conductor crimping portion 32 is crimped so that the tips of the pair of conductor clamping pieces 37 bite into the first conductor 11. Then, the second conductor 21 is crimped so that it is in close contact with the upper surface of the bottom plate 36.

[0045] Although the crimping method of the conductor crimping portion 32 has been described, the covering crimping portion 33 can be crimped by the same method. Specifically, first, an insulation crimper is used instead of the wire crimper 120, and the insulation crimper, which is an upper die, is lowered so as to approach the anvil 110, which is a lower die. This allows the pair of covering crimping pieces 38 of the covering crimping portion 33 to be bent inward so as to envelop the portion with the first insulating covering 12 and the second insulating covering 22, and the conductor crimping portion 32 can be crimped so that the second insulating covering 22 is in close contact with the upper surface of the bottom plate 36. When the first insulating covering 12 and the second insulating covering 22 are crimped by the pair of covering crimping pieces 38, the covering crimping portion 33 is crimped with the pair of covering crimping pieces 38 overlapping each other. By crimping the first insulating coating 12 and the second insulating coating 22 with the pair of coating crimping pieces 38, the first electric wire 10, the second electric wire 20, and the crimp terminal 30 can be firmly mechanically connected.

[0046] The corrosion-resistant coating formation process is a process of applying and curing a liquid corrosion-resistant coating 40 to a portion where the first conductor 11 and the crimp terminal 30 come into contact, such as the joint between the first conductor 11 and the rear joint portion 35, as shown in Fig. 1. The corrosion-resistant coating 40 can be formed, for example, by curing at least one of a monomer and an oligomer. At least one of the monomer and the oligomer may be an ultraviolet-curable resin. The ultraviolet-curable resin can be instantly cured by irradiating it with ultraviolet light.

[0047] As described above, the electric wire with terminal 1 according to the present embodiment includes a first electric wire 10 including a first conductor 11 and a first insulating coating 12 that covers the first conductor 11. The electric wire with terminal 1 includes a second electric wire 20 including a second conductor 21 and a second insulating coating 22 that covers the second conductor 21. The electric wire with terminal 1 includes a conductor crimping portion 32 that crimps the first conductor 11 and the second conductor 21, and the conductor crimping portion 32 includes a crimp terminal 30 including a bottom plate 36 and a pair of conductor crimping pieces 37 that are connected to the bottom plate 36 and crimp the first conductor 11 and the second conductor 21. The cross-sectional area of ​​the first conductor 11 is larger than the cross-sectional area of ​​the second conductor 21. The second conductor 21 is disposed between the first conductor 11 and the bottom plate 36 of the conductor crimping portion 32. The conductor crimping portion 32 is crimped so that the tips of the pair of conductor crimping pieces 37 bite into the first conductor 11.

[0048] The manufacturing method of the electric wire with terminal 1 according to the present embodiment includes a step of preparing a first electric wire 10, a second electric wire 20, and a crimp terminal 30. The first electric wire 10 includes a first conductor 11 and a first insulating coating 12 that covers the first conductor 11. The second electric wire 20 includes a second conductor 21 and a second insulating coating 22 that covers the second conductor 21. The crimp terminal 30 includes a conductor crimping portion 32 that crimps the first conductor 11 and the second conductor 21, and the conductor crimping portion 32 includes a bottom plate 36 and a pair of conductor crimping pieces 37 that are connected to the bottom plate 36 and crimp the first conductor 11 and the second conductor 21. The manufacturing method of the electric wire with terminal 1 includes a step of adjusting the positions of the first conductor 11 and the second conductor 21 with respect to the crimp terminal 30 so that the second conductor 21 is disposed between the first conductor 11 and the bottom plate 36 of the conductor crimping portion 32. The manufacturing method of the electric wire with terminal 1 includes a step of crimping the conductor crimping portion 32 so that tips of the pair of conductor crimping pieces 37 bite into the first conductor 11, and crimping the first conductor 11 and the second conductor 21 to the conductor crimping portion 32. The cross-sectional area of ​​the first conductor 11 is larger than the cross-sectional area of ​​the second conductor 21.

[0049] In the electric wire with terminal 1 and the manufacturing method of the electric wire with terminal 1 according to the present embodiment, the second conductor 21 is disposed between the first conductor 11 and the bottom plate 36 of the conductor crimping portion 32. Therefore, the first conductor 11 and the second conductor 21 can be prevented from being arranged in the horizontal direction. This can prevent the second conductor 21, which has a smaller cross-sectional area than the first conductor 11, from being excessively compressed when, for example, the conductor crimping pieces 37 are not crimped symmetrically. When conductors with different cross-sectional areas are crimped, the mechanical connection strength of the first conductor 11 and the second conductor 21 to the crimp terminal 30 depends on the second conductor 21, which has a smaller cross-sectional area at an appropriate compression rate. Therefore, it can be expected that the joint strength of the electric wire with terminal 1 will be higher than the joint strength of an electric wire with a smaller cross-sectional area in an over-compressed state.

[0050] Furthermore, in the electric wire with terminal 1 and the manufacturing method for the electric wire with terminal 1 according to the present embodiment, the conductor crimping portion 32 is crimped so that the tips of the pair of conductor crimping pieces 37 bite into the first conductor 11. By causing the tips of the pair of conductor crimping pieces 37 to bite into the first conductor 11, it is possible to strengthen the mechanical joint with the first conductor 11 having a large cross-sectional area. In addition, it is possible to prevent the tips of the conductor crimping pieces 37 from biting into the second conductor 21 having a small cross-sectional area, thereby preventing the second conductor 21 from being excessively compressed.

[0051] Therefore, according to the electric wire with terminal 1 and the manufacturing method thereof according to the present embodiment, the mechanical connection strength of the first electric wire 10 and the second electric wire 20 to the crimp terminal 30 can be improved.

[0052] The electric wire with terminal 1 can be used in a wire harness used in a vehicle such as an automobile.

[0053] Although the present embodiment has been described above, the present embodiment is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment. [Explanation of symbols]

[0054] 1 Wire with terminal 10 First Wire 11 First Conductor 12 First insulating coating 13 First wire 20 Second Wire 21 Second Conductor 22 Second insulating coating 23 Second Wire 30 Crimp terminal 32 Conductor crimping section 36 Bottom plate 37 Conductor clamping piece 40 Anticorrosion

Claims

1. A first electric wire including a first conductor and a first insulating coating covering the first conductor; A second electric wire including a second conductor and a second insulating coating covering the second conductor; a crimp terminal including a conductor crimping portion that crimps the first conductor and the second conductor, the conductor crimping portion including a bottom plate and a pair of conductor crimping pieces that are connected to the bottom plate and that crimp the first conductor and the second conductor; Equipped with A cross-sectional area of ​​the first conductor is larger than a cross-sectional area of ​​the second conductor, The second conductor is disposed between the first conductor and the bottom plate of the conductor crimping portion, the conductor crimping portion is crimped so that tips of the pair of conductor crimping pieces bite into the first conductor.

2. The electric wire with terminal according to claim 1 , wherein the first conductor is mainly composed of aluminum, and the second conductor is mainly composed of aluminum.

3. 2. The electric wire with terminal according to claim 1, wherein a cross-sectional area of ​​the first conductor is three times or more as large as a cross-sectional area of ​​the second conductor, the first conductor is mainly composed of aluminum, and the second conductor is mainly composed of copper.

4. The electric wire with terminal according to any one of claims 1 to 3, wherein the first conductor includes a plurality of first strands, the second conductor includes a plurality of second strands, and a strand diameter of each of the first strands is substantially the same as a strand diameter of each of the second strands.

5. The electric wire with terminal according to any one of claims 1 to 3, further comprising an anticorrosive material provided at a joint between the first conductor and the crimp terminal.

6. preparing a first electric wire including a first conductor and a first insulating coating covering the first conductor, a second electric wire including a second conductor and a second insulating coating covering the second conductor, and a crimp terminal including a conductor crimping portion that crimps the first conductor and the second conductor, the conductor crimping portion being connected to the bottom plate and including a pair of conductor crimping pieces that crimp the first conductor and the second conductor; adjusting positions of the first conductor and the second conductor with respect to the crimp terminal so that the second conductor is disposed between the first conductor and the bottom plate of the conductor crimping portion; a step of crimping the conductor crimping portion so that tips of the pair of conductor crimping pieces bite into the first conductor, and crimping the first conductor and the second conductor to the conductor crimping portion; Including, A method for manufacturing an electric wire with a terminal, wherein a cross-sectional area of ​​the first conductor is larger than a cross-sectional area of ​​the second conductor.

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