Terminal-equipped wire

Abstract

To provide a terminal-equipped wire that can increase tensile strength.SOLUTION: A terminal-equipped wire 1 to which an electric wire 20 is joined includes a terminal 10 having an electric wire joint portion 11, and the electric wire 20 joined to the electric wire joint portion 11. A first surface 14a and a second surface 14b having different heights are formed at different positions in the width direction W on a surface 14 of the electric wire joint portion 11 facing the electric wire 20. The electric wire 20 is joined to the electric wire joint portion 11 at the first surface 14a, the second surface 14b, and at least a part of a region 17 between the first surface 14a and the second surface 14b.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a terminal-attached electric wire. [Background technology]

[0002] Regarding the joining of a terminal and an electric wire, for example, Patent Document 1 discloses an electric wire with a terminal in which the end in the width direction is located higher than the middle part at the joint with the electric wire. In the electric wire with a terminal disclosed in Patent Document 1, the terminal fitting and the core wire housed inside the terminal fitting are welded by ultrasonic welding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-259702 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for miniaturization of parts used in automobiles to save space. For example, when a terminal is miniaturized, an electric wire is joined to the terminal with a narrow joint width at the joint portion. In this case, it is difficult to ensure a sufficient joint area at the joint portion of the terminal. When the joint area between the terminal and the electric wire is reduced, the tensile strength at the joint portion between the terminal and the electric wire is weakened. Therefore, there is a demand for an electric wire with a terminal that can increase the tensile strength.

[0005] In view of the above, an object of the present disclosure is to provide an electric wire with a terminal that can have increased tensile strength. [Means for solving the problem]

[0006] The electric wire with a terminal of the present disclosure is an electric wire with a terminal to which an electric wire is joined, and includes a terminal having an electric wire joining portion, and the electric wire joined to the electric wire joining portion, wherein a first surface and a second surface having different heights are formed at different positions in the width direction on a surface of the electric wire joining portion that faces the electric wire, and the electric wire is joined to the electric wire joining portion at least at a portion of the first surface, the second surface, and an area between the first surface and the second surface. Effect of the Invention

[0007] According to the present disclosure, a terminal-attached electric wire capable of increasing tensile strength is provided. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a terminal-attached electric wire according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view showing a terminal constituting the terminal-attached electric wire. [Diagram 3] FIG. 3 is a perspective view showing electric wires constituting the terminal-attached electric wire. [Figure 4] FIG. 4 is a cross-sectional view showing a cross section taken along line IV-IV in FIG. [Diagram 5] FIG. 5 is an explanatory diagram showing how a terminal and an electric wire are joined. [Figure 6] FIG. 6 is a cross-sectional view showing a cross section corresponding to FIG. 4 of a terminal-attached electric wire as a comparative example. [Figure 7] FIG. 7 is an explanatory diagram for comparing the tensile strength of the electric wire with a terminal according to the first embodiment and that of a comparative example. [Figure 8] FIG. 8 is a cross-sectional view showing a cross section corresponding to FIG. 4 of a terminal-attached electric wire in the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing a cross section corresponding to FIG. 4 of a terminal-attached electric wire in the third embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing a cross section corresponding to FIG. 4 of a terminal-attached electric wire in the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described.

[0010] The terminal-attached electric wire of the present disclosure is as follows.

[0011] (1) A terminal-attached electric wire to which an electric wire is joined, comprising: a terminal having an electric wire joining portion; and the electric wire joined to the electric wire joining portion, the electric wire joining portion having a first surface and a second surface with different heights at different positions in the width direction formed on a surface of the electric wire joining portion facing the electric wire, the electric wire being joined to the electric wire joining portion at the first surface, the second surface, and at least a part of the region between the first surface and the second surface. This creates a joining portion in the terminal that also expands in the height direction, thereby increasing the joining area between the terminal and the electric wire. The increased joining area increases the strength of the joining. Therefore, the tensile strength can be increased.

[0012] In addition, when there is a portion where the electric wire joint portion and the electric wire are not joined, it is preferable that the total width, which is the sum of the width of the first surface, the width of the second surface, and the width of the area between the first surface and the second surface where the electric wire is joined, is larger than the width of the electric wire joint portion in a plan view.

[0013] (2) In the electric wire with terminal according to (1), the electric wire joint portion and the electric wire may include a portion in which the size of the electric wire joint portion in a width direction coincides with the size of the electric wire in a width direction, thereby making it possible to enlarge the joint portion between the terminal and the electric wire in the width direction of the electric wire joint portion.

[0014] (3) In the electric wire with terminal of (1) or (2), the electric wire joint portion may have a base portion and a wall portion protruding from an end portion in the width direction of the base portion, the first surface being a main surface of the base portion, and the second surface being a tip surface of the wall portion. This increases the joint area by the side surface of the wall portion compared to an electric wire joint portion without a wall portion, and therefore increases the tensile strength.

[0015] (4) In the electric wire with terminal of (3), the pair of wall portions may be formed at both ends of the base portion in the width direction, and the second surface may be formed on each of the tip surfaces of the pair of wall portions. This increases the joint area by the side surfaces of the pair of wall portions. In addition, since the pair of wall portions are located at both ends of the first surface, the electric wire is placed on the first surface formed in the center when the electric wire joint portion and the electric wire are joined, making it easy to join the electric wire joint portion and the electric wire.

[0016] (5) The terminal-attached electric wire according to any one of (1) to (4), wherein the electric wire may be joined to the electric wire joint portion via a resistance welded portion formed by resistance welding or an ultrasonic joint formed by ultrasonic joining.

[0017] (6) In the electric wire with terminal according to (5), the electric wire may be joined to the electric wire joint portion via the resistance welded portion, and the core wire of the electric wire or the electric wire joint portion may be Sn-plated. The resistance welding is performed satisfactorily by the Sn plating.

[0018] (7) In the electric wire with terminal according to (5), the terminal may be made of copper or a copper alloy, and the electric wire may include a core wire made of copper or a copper alloy, thereby suppressing galvanic corrosion.

[0019] (8) In the electric wire with terminal according to any one of (1) to (7), the electric wire may be a stranded wire. This allows the electric wire to change shape more easily than a single-core wire. This allows the electric wire to change shape more easily to match the shape of the electric wire joint, thereby increasing the contact area between the electric wire and the electric wire joint.

[0020] [Details of the embodiment of the present disclosure] [First embodiment] Specific examples of the terminal-attached electric wire of the present disclosure will be described with reference to the following drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0021] The terminal-attached electric wire according to the present disclosure will be described below.

[0022] <About terminal-attached electric wire 1> The structure of the terminal-attached electric wire according to the first embodiment will be outlined below. FIG. 1 is a perspective view showing a terminal-attached electric wire 1 according to the first embodiment of the present disclosure. FIG. 2 is a perspective view showing a terminal 10 constituting the terminal-attached electric wire 1. FIG. 3 is a perspective view showing an electric wire 20 constituting the terminal-attached electric wire 1. FIG. 4 is a cross-sectional view showing a cross section taken along line IV-IV in FIG. 1. In this embodiment, the surfaces are not limited to flat surfaces, and curved surfaces are also included. In FIG. 1, the conductors constituting the stranded wire are illustrated at the tip portion of the core wire 21, but in other figures, the conductors are omitted.

[0023] The terminal-attached electric wire 1 includes a terminal 10 and an electric wire 20 joined to the terminal 10. The electric wire 20 includes a core wire 21 and a covering portion 22 covering the core wire 21. The core wire 21 is made of a material including, for example, copper or a copper alloy. The core wire 21 according to this embodiment is, for example, a twisted wire. The core wire 21 is plated with, for example, Sn. The covering portion 22 is formed of, for example, an insulating material. This embodiment is applicable not only to twisted wires but also to single-core wires. When it is desired to ensure a predetermined strength as the core wire 21, a single-core wire is used instead of a twisted wire. However, a twisted wire is easily deformed even with a relatively small pressure. Therefore, when joining to the terminal 10, the twisted wire is easier to conform to the shape of the joining portion of the terminal 10.

[0024] As shown in Fig. 4, the electric wire joint 11, which will be described later in detail, includes a portion where the widthwise size w1 of the electric wire joint 11 and the widthwise size w2 of the electric wire 20 are the same. The electric wire joint 11 is joined to a core wire 21. In this embodiment, a configuration in which the size w1 and the size w2 are the same is adopted, but is not limited thereto. The size w1 and the size w2 may be different.

[0025] <About terminal 10> The terminal 10 includes an electric wire joint 11 to which the electric wire 20 is joined, an electric contact portion 12 to be electrically connected to a connection partner, and a connecting portion 13 connecting the electric wire joint 11 and the electric contact portion 12. The electric wire joint 11, the electric contact portion 12, and the connecting portion 13 are connected in a length direction L. The terminal 10 is formed, for example, of a single plate-shaped member that is pressed. The terminal 10 is formed, for example, of a material containing copper or a copper alloy. The terminal 10 is also plated, for example, with Sn. From the viewpoint of suppressing galvanic corrosion, the electric wire joint 11 of the terminal 10 is preferably made of the same material as the core wire 21.

[0026] The electric wire joint portion 11 has a surface 14 facing the electric wire 20 (core wire 21). A first surface 14a and a second surface 14b are formed on the surface 14. The first surface 14a and the second surface 14b are formed at different positions in the width direction W of the electric wire joint portion 11. The first surface 14a and the second surface 14b have different heights in a height direction H. Here, the height direction H is a direction perpendicular to the width direction W and the length direction L. The height direction H may be the stacking direction of the core wire 21 with respect to the electric wire joint portion 11, or may be the direction in which pressure is applied during joining.

[0027] In this embodiment, both ends of the plate-shaped portion are bent upward along the height direction H by bending. Walls 16 are formed at both ends of the electric wire joint 11 in the width direction W. The wall 16 is formed by bending both ends of the electric wire joint 11 in the width direction W. That is, the electric wire joint 11 includes a plate-shaped base portion 15 and a pair of wall portions 16 located at both ends of the base portion 15. The wall portions 16 are bent so as to be perpendicular to the base portion 15. The wall portions 16 may form an obtuse angle or an acute angle with respect to the base portion 15. The first surface 14a of the electric wire joint 11 is one main surface of the base portion 15 (a portion not bent). The second surface 14b of the electric wire joint 11 is a tip surface 16a of the wall portions 16 located at both ends of the first surface 14a (base portion 15) in the width direction W. The tip surface 16a is a portion that corresponds to the side surface of the plate-like member before bending. In this embodiment, the tip surfaces 16a (second surfaces 14b) formed on both ends have the same height. However, the tip surfaces 16a (second surfaces 14b) may have different heights.

[0028] The surface 14 further includes a region 17 (rising surface 16b of the wall portion 16) between the first surface 14a and the tip surface 16a (second surface 14b) on the base portion 15. The core wire 21 is joined at least in a part of the region 17 (rising surface 16b). In this embodiment, resistance welds 23 are formed between the first surface 14a of the base portion 15 and the core wire 21, between the two tip surfaces 16a (second surface 14b) and the core wire 21, and between the region 17 (rising surface 16b) and the core wire 21. In this embodiment, no gap is formed between the surface 14 and the core wire 21, and the surface 14 and the core wire 21 are continuously joined. The total joining width between the first surface 14a, the two tip surfaces 16a, the two regions 17, and the core wire 21 is the sum of the width of the first surface 14a, the width of the two tip surfaces 16a, and the rising length of the two regions 17. However, a gap may be formed between the surface 14 of the terminal 10 and the core wire 21. The gap may be formed, for example, at a corner portion between the first surface 14a and the rising surface 16b. Even when a gap is formed, the total joint width between the first surface 14a, the two tip surfaces 16a, the two regions 17, and the core wire 21 is preferably larger than the width of the electric wire joint portion 11. The total joint width between the first surface 14a, the two tip surfaces 16a, the two regions 17, and the core wire 21 is a length obtained by subtracting a length corresponding to the gap from the sum of the width of the first surface 14a, the width of the two tip surfaces 16a, and the rising length of the two regions 17.

[0029] The electrical contact portion 12 and the connecting portion 13 are plate-shaped. The electrical contact portion 12 is formed with a through hole 12a (see Figs. 1 and 2) through which a fixing member for fixing the connection partner of the electric wire 20 to the terminal 10 passes. The fixing member is, for example, a screw or a bolt. In this embodiment, the fixing member such as a screw or a bolt is exemplified as the fixing structure between the connection partner of the electric wire 20 and the terminal 10, but is not limited thereto. As the fixing structure between the connection partner of the electric wire 20 and the terminal 10, other fixing structures such as adhesion or welding or fitting structures may be adopted.

[0030] <Joining of terminal 10 and electric wire 20> FIG. 5 is an explanatory diagram showing how the terminal 10 and the electric wire 20 are joined together.

[0031] In this embodiment, the core wire 21 of the electric wire 20 is joined to the electric wire joint portion 11 via a resistance welded portion 23. The resistance welded portion 23 is formed at the joint portion between the core wire 21 and the electric wire joint portion 11 by resistance welding. Note that, in this embodiment, a configuration is adopted in which the core wire 21 is joined to the electric wire joint portion 11 via the resistance welded portion 23, but this is not limited thereto. Instead of the resistance welded portion 23, the core wire 21 may be joined to the electric wire joint portion 11 via a crimped portion formed by crimping, an ultrasonic joint portion formed by ultrasonic jointing, a soldered portion formed by soldering, or the like.

[0032] As shown in FIG. 5, the resistance welding machine 30 includes a lower electrode 31, an upper electrode 32, and a side guide member 33. The lower electrode 31 may be a cathode, and the upper electrode 32 may be an anode. The side guide member 33 is made of, for example, an insulating ceramic material. The side guide member 33 supports the outer side surface of the wall portion 16 from both sides. The support surface of the side guide member 33 extends to above the wall portion 16. This allows the core wire 21, which is about to protrude outside the electric wire joint portion 11 during resistance welding, to be restricted by the support surface of the side guide member 33 so as not to protrude. By performing resistance welding using the side guide members 33 on both sides, a configuration can be achieved that includes a portion where the width direction size w1 of the electric wire joint portion 11 and the width direction size w2 of the electric wire 20 coincide with each other.

[0033] The upper electrode 32 is movable in the height direction H. During welding, the upper electrode 32 moves in a direction approaching the lower electrode 31.

[0034] When resistance welding is performed between the terminal 10 and the electric wire 20, the terminal 10 is first placed on the lower electrode 31. At this time, the terminal 10 is arranged so as to be clamped by the side guide members 33. Next, the electric wire 20 (core wire 21) is placed on the electric wire joint portion 11 of the terminal 10. In this manner, the electric wire joint portion 11 and the core wire 21 are arranged between the lower electrode 31 and the upper electrode 32. Then, the upper electrode 32 moves in a direction approaching the lower electrode 31, and the lower electrode 31 and the upper electrode 32 pressurize the electric wire joint portion 11 and the core wire 21. With this pressurization, electricity is passed through the lower electrode 31 and the upper electrode 32, and the electric wire joint portion 11 and the core wire 21 are heated. The core wire 21 is pressed against the electric wire joint portion 11 by the pressurization, and the core wire 21 is deformed to conform to the shape of the tip surface of the electric wire joint portion 11. As a result, the core wire 21 is pressed against the first surface 14a and the two second surfaces 14b, and also against the rising surface 16b, and is welded to the electric wire joint portion 11 at the pressed portion.

[0035] At this time, the core wire 21 that is about to protrude outside the electric wire joint portion 11 is restricted so as not to protrude outside the electric wire joint portion 11, so that both side surfaces of the core wire 21 coincide with both side surfaces of the electric wire joint portion 11.

[0036] Thereafter, the upper electrode 32 moves in a direction away from the lower electrode 31, and the upper electrode 32 returns to its initial position. Then, the terminal-attached electric wire 1 formed by joining the electric wire 20 to the terminal 10 is taken out from the resistance welding machine. Note that the above-mentioned order can be changed as appropriate.

[0037] <Comparison with conventional technology> Fig. 6 is a cross-sectional view showing a cross section of a terminal-attached electric wire 101 as a comparative example, corresponding to Fig. 4. Fig. 7 is an explanatory diagram for comparing the tensile strength of the terminal-attached electric wire 1 of the present embodiment and the terminal-attached electric wire 101 as a comparative example.

[0038] The electric wire joint 111 of the terminal 110 in the terminal-attached electric wire 101 does not have a surface corresponding to the rising surface 16b in this embodiment. That is, the electric wire joint 111 does not have the wall portion 16 in this embodiment, and the surface 114 facing the electric wire 20 is flush.

[0039] The terminal 10 in this embodiment and the terminal 110 in the comparative example have a plate thickness of 1.5 mm, a widthwise dimension w1 (see Figs. 4 and 6) of 17.5 mm, and a length of the electric wire joints 11, 111 of 9.0 mm. The tensile strength of the electric wire 20 relative to the terminals 10, 110 will be compared between the terminal-attached electric wire 1 of this embodiment and the terminal-attached electric wire 101 of the comparative example. The height h (see Fig. 4) from the surface 14 of the terminal 10 to the tip surface 16a is 3 mm. The cross-sectional area of ​​the core wire 21 is 70 mm. 2 It states that:

[0040] 7, the tensile strength of the terminal-attached electric wire 101 is 12109 [N], whereas the tensile strength of the terminal-attached electric wire 1 is 13386 [N]. In other words, the terminal-attached electric wire 1 of this embodiment has a strength increased by about 10% (13386 [N] / 12109 [N]×100≒110 [%]) compared to the terminal-attached electric wire 101 of the comparative example. This is considered to be because the joint area is increased by the region 17 (the rising surface 16b of the wall portion 16) between the first surface 14a and the tip surface 16a (the second surface 14b) in the terminal-attached electric wire 1 of this embodiment.

[0041] <Advantages of the First Embodiment> According to the electric wire with terminal 1 configured as above, the electric wire with terminal 1 to which the electric wire 20 is joined includes the terminal 10 having the electric wire joint portion 11 and the electric wire 20 joined to the electric wire joint portion 11, and the first surface 14a and the second surface 14b having different heights are formed at different positions in the width direction W on the surface 14 of the electric wire joint portion 11 facing the electric wire 20, and the electric wire 20 is joined to the electric wire joint portion 11 at least in a part of the first surface 14a, the second surface 14b, and the region 17 between the first surface 14a and the second surface 14b. As a result, a joint portion is formed in the height direction H in the terminal 10, so that the joint area between the terminal 10 and the electric wire 20 increases accordingly. The strength of the joint increases as the joint area increases. Therefore, according to the electric wire with terminal 1 of this embodiment, the tensile strength can be increased.

[0042] In addition, in the electric wire joint portion 11, the size w1 of the width direction W of the electric wire joint portion 11 and the size w2 of the electric wire in the width direction are the same. This allows the joint portion between the terminal 10 and the electric wire 20 to be maximized in the width direction of the electric wire joint portion 11.

[0043] Moreover, the first surface 14a of the electric wire joint portion 11 is the main surface of the base portion 15, and the second surface 14b of the electric wire joint portion 11 is the tip surface 16a of the wall portion 16 formed at both ends in the width direction W of the first surface 14a. As a result, the joint area is increased by the rising surface 16b of the wall portion 16 compared to a case where the wall portion 16 is not formed. Also, since the wall portion 16 is located at both ends of the first surface 14a, the electric wire 20 is placed on the first surface 14a formed in the center when the electric wire joint portion 11 and the electric wire 20 are joined, so that the electric wire joint portion 11 and the electric wire 20 can be easily joined.

[0044] The electric wire 20 is joined to the electric wire joint 11 via a resistance welded portion 23 formed by resistance welding. The core wire 21 of the electric wire 20 and the electric wire joint 11 are plated with Sn. This is expected to facilitate resistance welding between the electric wire joint 11 and the core wire 21 due to the effect of an intermetallic compound formed by the Sn plating.

[0045] Furthermore, if the terminal 10 is made of copper or a copper alloy and the core wire 21 of the electric wire 20 is made of copper or a copper alloy, the terminal 10 and the electric wire 20 are made of the same type of metal. Therefore, galvanic corrosion caused by contact between two types of metals is suppressed.

[0046] Furthermore, if the core wire 21 of the electric wire 20 is a stranded wire, the shape is more easily changed than if the core wire is a single core wire. Therefore, the electric wire 20 is more likely to change shape to match the shape of the electric wire joint portion 11, and the contact area between the electric wire 20 and the electric wire joint portion 11 can be increased.

[0047] As disclosed in Patent Document 1, in the joint portion of the terminal fitting with the core wire, both ends in the width direction may be formed higher than the bottom surface, but the purpose was to prevent the electric wire from protruding outward beyond both ends. Therefore, it seems that no idea of ​​enlarging the joint portion with the core wire 21 by using the wall portions 16 formed at both ends in the width direction W as in the terminal-attached electric wire 1 of this embodiment was ever conceived.

[0048] [Second embodiment] FIG. 8 is a cross-sectional view showing a cross section corresponding to FIG. 4 of a terminal-attached electric wire 201 according to the second embodiment.

[0049] The terminal-attached electric wire 201 in the second embodiment includes a terminal 210 instead of the terminal 10 in the first embodiment. One end of the terminal 210 is bent upward in the height direction H by bending. As a result, a wall portion 216 is formed at one end of the electric wire joint 211 in the width direction W. In the second embodiment, the configuration other than the wall portion 216 (i.e., the configuration other than the omission of the wall portion on one side in the width direction) is the same as that of the electric wire joint 11 in the first embodiment. In the electric wire joint 211, the surface 214 facing the electric wire 20 includes a second surface 214b which is a tip surface of the wall portion 216 which is bent, and another portion of the wall portion 216 (a first surface 214a which is a main surface of the base portion 215).

[0050] <Effects of the second embodiment> In this embodiment, resistance welds 223 are formed between the first surface 214a of the base portion 215 and the core wire 21, between the tip surface 216a (second surface 214b) and the core wire 21, and between the region 217 (rising surface 216b) and the core wire 21. In this second embodiment, the joint area is also larger by the joint portion between the region 217 (rising surface 216b) corresponding to the wall portion 16 on one side and the core wire 21, compared to the above-mentioned comparative example (see FIG. 6). Therefore, the terminal-attached electric wire 201 of the second embodiment can also have a strong tensile strength.

[0051] [Third embodiment] FIG. 9 is a cross-sectional view showing a cross section of a terminal-attached electric wire 301 according to the third embodiment, which corresponds to FIG.

[0052] The terminal-attached electric wire 301 in the third embodiment includes a terminal 310 instead of the terminal 10 in the first embodiment. A base portion 315 located between the wall portions 16 at both ends includes two peak portions 318. The main surface between the peak portions 318 is the first surface 14a, and the top portions of the peak portions are another second surface 318a having a different height from the first surface 14a. A region 318b between the first surface 14a and the second surface 318a is a rising surface of the peak portion 318.

[0053] In the third embodiment, the electric wire 20 is joined at the first surface 14a, the second surface 14b, 318a, and the region 17, 318b between the first surface 14a and the second surface 14b, 318a. In the third embodiment, in addition to the joint portion in the first embodiment, the region 318b which is the rising portion of the mountain portion 318 is also included in the joint portion. Therefore, the terminal-attached electric wire 301 of the third embodiment has a larger joint area by the joint portion between the region 318b and the core wire 21 than the terminal-attached electric wire 1 of the first embodiment. Therefore, the terminal-attached electric wire 301 of the third embodiment can also have a high tensile strength.

[0054] [Fourth embodiment] FIG. 10 is a cross-sectional view showing a cross section of a terminal-attached electric wire 401 according to the fourth embodiment, which corresponds to FIG.

[0055] A terminal-attached electric wire 401 in the fourth embodiment includes a terminal 410 instead of the terminal 10 in the first embodiment. A first surface 414a is formed in the center of a surface 414, and second surfaces 414b having a different height from the first surface 414a are formed on both ends. The second surface 414b is higher than the first surface 414a. A region 419 between the first surface 414a and the second surface 414b is a rising surface toward the second surface 414b.

[0056] In this embodiment, the first surface 414a, the second surface 414b, and the region 419 of the electric wire 20 are joined to the core wire 21. The rising surface in the first to third embodiments has a steep slope, but the rising surface 419 in the fourth embodiment is formed to be gentler than the rising surfaces in the first to third embodiments. Therefore, the core wire 21 is easily formed into a shape that conforms to the rising surface. That is, the region where the core wire 21 and the region 419 contact each other is widened. Also, the core wire 21 is easily pressed against the gentle rising surface during joining.

[0057] In addition, in the terminal-attached electric wire 401 of the fourth embodiment, since the region 419 is inclined, the joining area with the core wire 21 is larger than that of the flat surface 14 of the comparative example. Therefore, the terminal-attached electric wire 401 of the fourth embodiment can also have a high tensile strength.

[0058] [Variations] In the above-described embodiment, the terminals 10, 210, 310, 410 and the core wires 21 are joined to each other by the resistance welding portion 23, but this is not limiting. They may be joined to each other by other joining methods such as crimping, ultrasonic bonding, and soldering.

[0059] Furthermore, the configurations described in the above embodiments and modifications can be combined as appropriate as long as they are not mutually contradictory. [Explanation of symbols]

[0060] 1,101,201,301,401 Terminal wire 10,110,210,310,410 terminal 11,111,211 Wire joint 12 Electrical contact 12a Through hole 13 Connecting part 14,114,214 sides 14a,214a,414a 1st page 14b,214b,318a,414b 2nd side 15,215,415 Base 16,216 wall 16a,216a Tip surface 16b,216b Rising surface 17,217,318b,419 area 20 Electric wire 21 Core Wire 22 Covering part 23,223 Resistance welding 30 Resistance welding machine 31 Lower electrode 32 Upper electrode 33 Side guide member 318 Yamabe H Height direction L direction W Width direction h Height

Claims

1. A terminal-attached electric wire to which an electric wire is joined, A terminal having a wire joint; The electric wire is joined to the electric wire joint portion, A first surface and a second surface having different heights are formed at different positions in a width direction on a surface of the electric wire joint portion facing the electric wire, The electric wire is joined to the electric wire joint portion at the first surface, the second surface, and at least a portion of a region between the first surface and the second surface. Wire with terminal.

2. The terminal-attached electric wire according to claim 1, The electric wire joint portion and the electric wire include a portion in the electric wire joint portion where a size of the electric wire joint portion in a width direction coincides with a size of the electric wire in a width direction. Wire with terminal.

3. The terminal-attached electric wire according to claim 1 or 2, The electric wire joint portion has a base portion and a wall portion protruding from an end portion in a width direction of the base portion, the first surface is a main surface of the base portion, The second surface is a tip surface of the wall portion. Wire with terminal.

4. The terminal-attached electric wire according to claim 3, The pair of walls are formed at both ends of the base in a width direction, The second surface is formed on each of the tip surfaces of the pair of wall portions. Wire with terminal.

5. The terminal-attached electric wire according to claim 1 or 2, The electric wire is joined to the electric wire joint portion via a resistance welded portion formed by resistance welding or an ultrasonic joint formed by ultrasonic joining. Wire with terminal.

6. The terminal-attached electric wire according to claim 5, The electric wire is joined to the electric wire joint portion via the resistance welded portion, The core wire or the wire joint portion of the electric wire is plated with Sn. Wire with terminal.

7. The terminal-attached electric wire according to claim 5, the terminal is made of copper or a copper alloy; The electric wire includes a core wire made of copper or a copper alloy. Wire with terminal.

8. The terminal-attached electric wire according to claim 1 or 2, The wire includes a stranded wire. Wire with terminal.

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