Wires with terminals, wire harnesses, terminals

Abstract

To provide an electric wire with a terminal that has good crimp workability and can achieve both connection strength and connection resistance.SOLUTION: An electric wire with a terminal 10 has a terminal 1 and a coated conducting wire 11 electrically connected with each other. A crimping part 5 of the terminal 1 is a portion crimped with the coated conducting wire 11, and has a conducting wire crimping part 7 that crimps a conducting wire 13 exposed from a leading end of a coating part 15 of the coated conducting wire 11, and a coating crimping part 9 that crimps the coating part 15 of the coated conducting wire 11. A part of an inner surface of the conducting wire crimping part 7 is a thick part where plate-like members are laminated in a circumferential direction. That is, the thickness of the thick part is larger than the thickness of the other portion than the thick part of the conducting wire crimping part 7. The thick part and the other portion of the conducting wire crimping part 7 are substantially compressed on their outer surfaces, and thus the compressibility of the thick part is smaller than the compressibility of the other portion of the conducting wire crimping part 7.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electric wire with a terminal, for example, used in an automobile or the like. [Background technology]

[0002] Typically, automotive wiring harnesses are made by connecting crimp terminals to the conductors of covered conductors, bundling them together, and then wiring them as signal lines in automobiles, etc. A typical covered conductor and crimp terminal are connected by removing the covering from the tip of the covered conductor, crimping the exposed conductor to a conductor crimping portion, and then crimping the covering at the covering crimping portion. The combined connection strength of the conductor crimping portion and the covering crimping portion satisfies the connection strength requirements between the crimp terminal and the covered conductor in an automotive wiring harness.

[0003] However, as the electric wires used become thinner, it becomes difficult to maintain strength using only the conductor that constitutes the electric wire, and therefore electric wires containing tension members are being considered. For example, when using an electric wire made of a conductor with a tensile strength of about 30 N, in order to ensure a tensile strength exceeding 80 N required for electric wires for automobiles, an electric wire containing tension members has been proposed in which the conductor is wound spirally around the outer periphery of a metallic or nonmetallic tension member. Such electric wires are prepared by step-stripping the conductor, exposing the tension member, inserting it into a sleeve, crimping the tension member with a steel clamp, and further integrating it with a curable resin such as an adhesive, and crimping the conductor portion with an aluminum clamp or the like (Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 61-046827 [Patent Document 2] Japanese Patent Application Publication No. 8-237839 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, particularly in the automotive field, the number of ECUs and sensors has increased in response to CASE and other trends, resulting in a significant increase in the number of electric wires used. In this situation, increasing the wire diameter of wire harnesses has become an issue. For this reason, there is a demand for even thinner electric wires for automobiles. For example, the conventional general 0.35 sq (sq: mm 2 There is a demand for electric wires with a diameter of 1 / 4" or less.

[0006] Here, the conductor crimping portion must satisfy both the connection strength between the electric wire and the terminal and the electrical connection resistance between the conductor and the terminal. To satisfy the required specifications for both the connection strength with the electric wire and the electrical connection resistance with the conductor, the compression ratio of the conductor crimping portion must be appropriately set. However, as the diameter of the electric wire becomes smaller, it becomes difficult to satisfy both requirements with the same compression ratio.

[0007] For example, when connecting a large-diameter coated conductor to a crimp terminal using conventional technology, the conductor crimping portion can be crimped at a compression ratio that achieves both connection strength and connection resistance. However, as the diameter of the wire becomes smaller, the range of appropriate crimping conditions for both connection strength and electrical resistance becomes narrower. This is because, if you try to ensure connection strength, the conductor will break and the connection resistance will increase, and if you prioritize connection resistance, you will not be able to achieve sufficient connection strength, which can lead to the wire coming loose. Thus, the smaller the wire diameter, the more difficult it becomes to achieve both connection strength and electrical resistance.

[0008] On the other hand, when crimping a coated conductor having a tension member, the tension member deforms less during crimping than the conductor. Therefore, when the conductor is compressed in the conductor crimping section, the conductor is crushed and deformed preferentially relative to the tension member. During this process, the conductor reduces its cross-sectional area and stretches axially due to deformation, causing a portion of the conductor to protrude behind the conductor crimping section. However, because the tension member barely stretches, there is almost no change in the tension member located behind the conductor crimping section. As a result, the conductor becomes longer than the tension member behind the conductor crimping section, causing the conductor to expand radially.

[0009] If the conductor wire expands radially in this way, it may break due to contact with the edge of the end of the crimping portion or with other components. In this way, the extension of the conductor wire toward the rear of the conductor crimping portion may reduce the connection strength and connection resistance.

[0010] The present invention has been made in view of the above problems, and has an object to provide an electric wire with a terminal or the like that has good crimping workability and can achieve both connection strength and connection resistance. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, a first invention is an electric wire with terminal in which a covered conductor wire and a terminal are electrically connected, the terminal comprising a conductor crimping portion to which the conductor wire exposed from the coating portion at the tip of the covered conductor wire is crimped, and a coating crimping portion to which the coating portion of the covered conductor wire is crimped, the conductor crimping portion has a thick portion formed on a part of its inner surface in an axial portion thereof that is thicker than other parts, and the compressibility of the thick portion is smaller than the compressibility of the other part of the conductor crimping portion. the thick portion is formed on the tip side of the conductor crimping portion, a wire holding portion for holding the conductor is provided on the tip side of the conductor crimping portion, and a conducting portion for establishing electrical continuity with the conductor is provided on the rear end side of the conductor crimping portion, the wire holding portion is thicker than the conducting portion, at least a portion of the conductor is broken in the wire holding portion, the wire holding portion holds the conductor with at least a portion broken, the conductor is not broken in the conducting portion, and the electrical resistance of the conductor in the conducting portion is lower than the electrical resistance of the conductor in the wire holding portion The present invention relates to an electric wire with a terminal. It is desirable that the coated conductor wire consists of a plurality of the conductor wires and at least one tensile strength member, and that the wire holding portion holds both the conductor wires, at least partially broken, and the tensile strength member.

[0012] It is desirable that the thick portion and the other portion of the conductor crimping portion are compressed so that the dimensions of the outer surfaces in a direction perpendicular to the axial direction are substantially the same along the axial direction.

[0017] In a cross section perpendicular to the longitudinal direction of the covered conductor, the strength member may be located approximately at the center of the covered conductor, and the conductor may be disposed on the outer periphery of the strength member.

[0018] The cross-sectional area of ​​the conductor may be 0.35 sq or less.

[0019] The conductor crimping portion is tubular and closed in the circumferential direction. The thick portion is formed on the entire inner surface of the conductor crimping portion. That's fine.

[0020] The conductor crimping portion is an open barrel type. The circumferential length of the thick-walled portion is shorter than the circumferential length of the conductor crimping portion, and the thick-walled portion has a tapered shape such that the thickness gradually decreases at both circumferential ends. That's fine.

[0021] According to the first aspect of the present invention, a thick portion is formed on a part of the inner surface of the conductor crimping portion, which is thicker than the other portions. This allows the compression rate to be varied locally when crimping the conductor crimping portion. In this case, the same mold as in the past can be used for crimping. In other words, the compression rate is varied depending on the terminal thickness, rather than by a special mold shape, which improves the ease of crimping.

[0022] Furthermore, if the conductor crimping portion has two functional parts, a wire holding part that holds the conductor to increase connection strength, and a conductive part that ensures conductivity with the conductor to reduce connection resistance, both connection strength and connection resistance can be satisfied.

[0023] More specifically, by making the compression ratios of the wire holding portion and the conductive portion different, the compression force of the wire holding portion and the compression force of the conductive portion can be changed. Therefore, crimping can be performed with a compression force appropriate for each function. In this case, by making the compression ratio of the wire holding portion smaller than that of the conductive portion, i.e., by strongly compressing the wire holding portion, the connection strength between the terminal and the covered conductor can be more reliably ensured.

[0024] In addition, at least a portion of the conductor may be broken in the wire holding portion. In this case, for example, a portion of the tensile strength member may enter a gap in the broken conductor in the wire holding portion, thereby increasing the pull-out resistance of the conductor and ensuring connection strength. Meanwhile, electrical continuity between the conductor and the crimp terminal is ensured by the conductive portion.

[0026] Furthermore, since the coated conductor wire has multiple conductor wires and a tension member, the tension members ensure the tensile strength of the conductor wires. In this case, the wire holding portion holds both the conductor wires and the tension members, ensuring high connection strength. Furthermore, since there is no need to connect the tension members and the conductor wires with separate clamps, as in conventional cases, the number of parts required is reduced and the connection process is easier.

[0027] Furthermore, if the conductor is disposed on the outer periphery of the central tension member in a cross section perpendicular to the longitudinal direction of the covered conductor, the conductor can be crimped reliably. In this case, the conductor may be twisted in the longitudinal direction around the outer periphery of the tension member.

[0028] The present invention is particularly effective when using a small diameter coated conductor having a cross-sectional area of ​​0.35 sq. or less, or even when using a small diameter coated conductor having a cross-sectional area of ​​0.3 sq. or less. The present invention is particularly effective when using a small diameter coated conductor having a cross-sectional area of ​​0.05 sq. or less and obtaining a tensile strength of 50 N or more.

[0029] Furthermore, if at least a portion of the conductor crimping portion is tubular, the conductor can be reliably crimped from the entire circumference, thereby preventing local stress (deformation) from occurring in the conductor during crimping.

[0030] Furthermore, if the conductor crimping portion is an open barrel type, the conductor can be easily placed on the conductor crimping portion from above the terminal, facilitating the process of crimping the terminal and the covered conductor.

[0031] A second invention is a wire harness characterized in that a plurality of electric wires with terminals, including the electric wire with terminal according to the first invention, are integrated together.

[0032] According to the second invention, it is possible to obtain a wire harness in which a plurality of small diameter electric wires are bundled together.

[0033] A third invention is a terminal electrically connected to a coated conductor wire, comprising: a conductor crimping portion to which a conductor exposed from a coating portion at a tip of the coated conductor wire is crimped; and a coating crimping portion to which the coating portion of the coated conductor wire is crimped, the conductor crimping portion has a tubular shape that is closed in the circumferential direction, A thick portion that is thicker than other portions is formed on at least a portion of the inner surface of the conductor crimping portion, and the thick portion and the outer surface of the other portions of the conductor crimping portion are diameter are approximately the same size The thick portion is formed on the tip side of the conductor crimping portion, and the thick portion is formed on the entire inner surface of the conductor crimping portion. The terminal is characterized by the above. A fourth invention is a terminal electrically connected to a covered conductor wire, comprising: a conductor crimping portion to which the conductor wire exposed from the coating at the tip of the covered conductor wire is crimped; and a coating crimping portion to which the coating of the covered conductor wire is crimped, wherein the conductor crimping portion is an open barrel type, and a thick-walled portion that is thicker than other portions is formed on at least a part of the inner surface of the conductor crimping portion, the thick-walled portion and other portions of the outer surface of the conductor crimping portion have substantially the same shape, the thick-walled portion is formed on the tip side of the conductor crimping portion, the circumferential length of the thick-walled portion is shorter than the circumferential length of the conductor crimping portion, and the thick-walled portion has a tapered shape such that its thickness gradually decreases at both circumferential ends.

[0037] Third or the fourth According to this invention, the electric wire with terminal according to the first invention can be easily obtained without using a special mold.

[0038] Furthermore, by thickening the tip of the conductor crimping portion, the tip side of the conductor crimping portion can be strongly crimped to serve as the wire holding portion, thereby ensuring high tensile strength.

[0040] Also, In the third invention, The conductor crimping section is tubular. So Therefore, the conductor wire can be reliably crimped from the entire circumference, which makes it possible to prevent local stress (deformation) from occurring in the conductor wire during crimping. [Effects of the Invention]

[0041] According to the present invention, it is possible to provide an electric wire with a terminal or the like that has good crimping workability and can achieve both connection strength and connection resistance. [Brief explanation of the drawings]

[0042] [Figure 1] FIG. 1 is a perspective view showing an electric wire 10 with a terminal. [Figure 2] FIG. 2 is a cross-sectional view showing the electric wire 10 with terminal. [Figure 3] 4(a) to 4(c) are cross-sectional views of the conductor crimping portion 7. FIG. [Figure 4] FIG. 2 is a diagram showing the terminal 1 and the coated conductor wire 11 before crimping. [Figure 5] 1A is a diagram showing the tip of the conductor 13, and FIGS. 1B to 1D are diagrams showing the tip of the conductor 13 before terminal processing. [Figure 6] 10A and 10B are diagrams showing other forms of the terminal processing unit 19. [Figure 7] 10(a) and 10(b) are diagrams showing the crimping process of the crimping unit 5. FIG. [Figure 8] FIG. 2 is a diagram showing a terminal 1a and a coated conductor wire 11 before crimping. [Figure 9] FIG. 2 is a perspective view showing a terminal-attached electric wire 10a. [Figure 10] 4(a) and 4(b) are cross-sectional views of the conductor crimping portion 7. FIG. [Figure 11] FIG. 2 is a diagram showing a terminal 1b and a coated conductor wire 11 before crimping. [Figure 12] FIG. 3 is a cross-sectional view showing a terminal-fitted electric wire 10b. [Figure 13] FIG. 2 is a diagram showing a terminal 1c and a coated conductor wire 11 before crimping. [Figure 14] 10(a) and 10(b) are diagrams showing the crimping process of the crimping unit 5. FIG. [Figure 15] FIG. 2 is a diagram showing a terminal 1d and a coated conductor wire 11 before crimping. [Figure 16] FIG. 1 is a diagram showing a terminal 1e and a coated conductor wire 11 before crimping. [Figure 17] 1A is a cross-sectional view showing an electric wire with terminal 10c, and FIG. 1B is a cross-sectional view showing an electric wire with terminal 10d. DETAILED DESCRIPTION OF THE INVENTION

[0043] (First embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing an electric wire with terminal 10, and Fig. 2 is a cross-sectional view of the electric wire with terminal 10. The electric wire with terminal 10 is configured by electrically connecting a terminal 1 and a coated conductor wire 11.

[0044] The coated conductor wire 11 is composed of a conductor wire 13 made of, for example, copper, a copper alloy, aluminum, or an aluminum alloy, and a coating 15 that coats the conductor wire 13. That is, the coated conductor wire 11 includes the coating 15 and the conductor wire 13 exposed from its tip.

[0045] The terminal 1 is made of, for example, copper, a copper alloy, aluminum, or an aluminum alloy. A coated conductor wire 11 is connected to the terminal 1. The terminal 1 is configured by connecting a terminal body 3 and a crimping portion 5 via a transition portion 4.

[0046] The terminal body 3 is formed by forming a plate material of a predetermined shape into a cylindrical body with a rectangular cross section. The terminal body 3 has an internal elastic contact piece formed by folding the plate material into the rectangular cylindrical body. A male terminal or the like is inserted into the front end of the terminal body 3 to connect it. In the following explanation, an example is shown in which the terminal body 3 is a female terminal that allows insertion of an insertion tab (not shown) of a male terminal or the like, but the present invention is not particularly limited to the detailed shape of the terminal body 3. For example, instead of the female terminal body 3, an insertion tab of a male terminal may be provided, or a bolt fastening portion like a round terminal may be provided.

[0047] The crimping portion 5 of the terminal 1 is a portion that is crimped to the coated conductor wire 11, and includes a conductor crimping portion 7 that crimps the conductor wire 13 exposed from the tip side of the coating portion 15 of the coated conductor wire 11, and a coating crimping portion 9 that crimps the coating portion 15 of the coated conductor wire 11. That is, the conductor wire 13 exposed when the coating portion 15 is stripped is crimped by the conductor crimping portion 7, and the conductor wire 13 and the terminal 1 are electrically connected. The coating portion 15 of the coated conductor wire 11 is crimped by the coating crimping portion 9 of the terminal 1. In this embodiment, the conductor crimping portion 7 and the coating crimping portion 9 are integrally configured to have a tubular (approximately cylindrical) shape that is closed in the circumferential direction.

[0048] Serrations (not shown) may be provided in the width direction (direction perpendicular to the longitudinal direction) on part of the inner surface of the conductor crimping portion 7. By forming serrations in this manner, the oxide film on the surface of the conductor 13 can be easily destroyed when the conductor 13 is crimped, and the contact area with the conductor 13 can be increased.

[0049] As shown in Fig. 2, a thick portion is formed on part of the inner surface of the conductor crimping portion 7 in the axial direction, for example, by overlapping a plate-like member in the circumferential direction. That is, the thickness of the thick portion is greater than the thickness of the other portions of the conductor crimping portion 7 other than the thick portion. The thick portion and the other portions of the conductor crimping portion 7 are compressed so that the dimensions of the outer surfaces in the direction perpendicular to the axial direction are approximately the same along the axial direction, and therefore the compression ratio of the thick portion is smaller than the compression ratio of the other portions of the conductor crimping portion 7. The compression ratio will be described in detail below.

[0050] Here, the thickness of the plate-like member may be constant, but by tapering the rear end so that the thickness gradually decreases, a sudden change in thickness can be suppressed. Also, by tapering the front end of the plate-like member so that the thickness gradually changes, a sudden deformation of the conductor exposed from the front end of the conductor crimping portion 7 (such as spreading of the conductor wire) can be suppressed.

[0051] In this embodiment, the thick-walled portion is formed on the tip side of the conductor crimping portion 7 (the terminal body 3 side of the conductor crimping portion 7). Here, a wire holding portion 7a that holds the conductor wire 13 is provided on the tip side of the conductor crimping portion 7, and a conductive portion 7b that establishes electrical continuity with the conductor wire 13 is provided on the rear end side of the conductor crimping portion 7. That is, the conductor crimping portion 7 has the wire holding portion 7a and the conductive portion 7b, and the wire holding portion 7a is thicker than the conductive portion 7b.

[0052] The wire holding portion 7a provided at the tip side (terminal body 3 side) of the wire crimping portion 7 has a relatively stronger holding force for the wire 13 than the conductive portion 7b, and the conductive portion 7b provided at the rear end side (coating crimping portion 9 side) of the wire crimping portion 7 is formed to obtain conductivity with the wire 13.

[0053] FIG. 3(a) is a cross-sectional view perpendicular to the axial direction of the conductor crimping portion 7. The wire holding portion 7a (left diagram) and the conductive portion (right diagram) have approximately the same outer diameter, but as described above, the wire holding portion 7a is thicker than the conductive portion 7b, and therefore has a smaller inner diameter. That is, the compression ratio (cross-sectional area of ​​the conductor 13 after compression / cross-sectional area of ​​the conductor 13 before compression) of the wire holding portion 7a is smaller than that of the conductive portion 7b. That is, the compression amount of the wire holding portion 7a is greater than that of the conductive portion 7b, and the wire holding portion 7a is strongly crimped. Therefore, the tensile strength (connection strength) of the conductor 13 at the wire holding portion 7a is greater than the tensile strength (connection strength) of the conductor 13 at the conductive portion 7b.

[0054] In the electric wire holding portion 7a, the conductor wire 13 is compressed and crimped into a substantially circular shape. Note that the shape of the electric wire holding portion 7a after crimping does not necessarily have to be substantially circular, but it is desirable that the cross-sectional shape of the conductive portion 7b after crimping is substantially circular.

[0055] In the example shown in Fig. 3(a), the conductor 13 is made up of seven wires, but the number of wires in the conductor 13 is not particularly limited. For example, as shown in Fig. 3(b), the conductor 13 may have 16 wires. It is desirable that the wires are twisted together.

[0056] Furthermore, the coated conductor wire 11 may be configured such that multiple conductor wires 13 (multiple conductor wires) and a tension member are covered with a covering portion 15. The tension member is a member that receives tension in response to a tensile load. For example, as shown in FIG. 3(c), in a cross section perpendicular to the longitudinal direction of the coated conductor wire 11, at least one tension member 17 may be located approximately at the center of the coated conductor wire 11, and multiple conductor wires 13 may be arranged on the outer periphery of the tension member 17. In this case, both the conductor wires 13 and the tension member 17 are crimped and held by the wire holding portion 7a and the conductive portion 7b. A conductor wire composed of the tension member 17 and the conductor wire 13 is referred to as a composite conductor 12.

[0057] In this case, each of the conductor wires 13 (element wires) arranged on the outer periphery of the strength member 17 may be conductor wires 13 (element wires) of the same cross-sectional area and shape. Furthermore, the conductor wires 13 may be twisted spirally in the longitudinal direction of the coated conductor wire 11 on the outer periphery of the strength member 17. Furthermore, the strength member 17 may be a single (integral) strength wire, or may be made up of multiple element wires.

[0058] As described above, the electric wire holding portion 7a is strongly crimped. For this reason, at least a portion of the conductor 13 may be broken. Breaking a portion of the conductor 13 increases electrical resistance, but some of the fibers of the tensile strength member enter the gaps in the broken conductor 13, increasing the pull-out resistance of the conductor 13 and ensuring connection strength. On the other hand, in the conductive portion 7b, the conductor 13 is not broken in order to maintain low electrical resistance.

[0059] Here, the cross-sectional area of ​​the conductor 13 (total cross-sectional areas of the element wires) or, if a reinforcing member 17 is used, the cross-sectional area of ​​the composite conductor 12 (total cross-sectional areas of the conductor 13 and the reinforcing member 17) is preferably 0.35 sq. or less. In this case, it is desirable that the terminal 1 be capable of crimping a conductor 13 having a cross-sectional area of ​​0.35 sq. or less. Furthermore, the cross-sectional area of ​​the conductor 13 or the composite conductor 12 (total cross-sectional areas of the element wires or total cross-sectional areas of the conductor 13 and the reinforcing member 17) is preferably 0.3 sq. or less. In this case, it is desirable that the terminal 1 be capable of crimping a conductor 13 having a cross-sectional area of ​​0.3 sq. or less. Furthermore, if a composite conductor 12 is used, for example, the total cross-sectional area of ​​the conductor 13 and the reinforcing member 17 may be 0.05 sq. or less. The smaller the cross-sectional area of ​​the conductor 13 (or total cross-sectional area of ​​the conductor 13 and the reinforcing member 17), the greater the effect of this embodiment.

[0060] The reinforcing member 17 may be a metal wire such as a steel wire, or may be made of resin or fiber-reinforced resin. As mentioned above, the reinforcing member 17 may be a single wire or a bundle of multiple fibers such as aramid fiber. By using such a reinforcing member 17, it is possible to ensure a tensile strength of 50 N or more for the conductor at the conductor crimping portion 7, even if the cross-sectional area of ​​the composite conductor 12 is 0.05 sq. or less. For example, the electric wires shown in Table 1 can be used as such a composite conductor.

[0061] [Table 1]

[0062] Next, a method for manufacturing the electric wire with terminal 10 will be described. Fig. 4 is a perspective view showing the terminal 1 and the covered conductor wire 11 before crimping. As described above, the terminal 1 has a terminal body 3 and a crimping portion 5. The crimping portion 5 is configured to have a substantially cylindrical shape, with the conductor crimping portion 7 and the covering crimping portion 9 integrated together. The crimping portion 5 is formed, for example, by rolling a plate member, butting the ends together, and joining them in the longitudinal direction by welding or brazing.

[0063] As described above, a plate-like member is attached to the inner surface of the electric wire holding portion 7a to form an integrated unit. The outer diameters (sizes) of the electric wire holding portion 7a and the conductive portion 7b are substantially the same. The conductor wire crimping portion 7 and the insulation crimping portion 9 may have the same diameter, or, as shown in the figure, the inner diameter of the insulation crimping portion 9 may be larger than the inner diameter of the conductor wire crimping portion 7. The plate-like member is preferably disposed around the entire circumference of the electric wire holding portion 7a, but may be disposed only partially around the circumference.

[0064] First, as described above, the coating 15 at the tip of the coated conductor wire 11 is stripped to expose the conductor wire 13 at the tip. Next, as shown in Fig. 5(a), a terminal processing section 19 may be formed at the tip of the conductor wire 13 before insertion into the crimping section 5 of the terminal 1. The terminal processing section 19 is a processing section that integrates the individual wires of the conductor wire 13 to prevent them from coming apart.

[0065] 5(b) is a diagram showing the shape of the tip of the conductor wire 13 before terminal processing. In this embodiment, when viewed from the tip of the coated conductor wire 11, the tension member 17 is located approximately in the center, and the conductor wire 13 is located around it. The conductor wire 13 is made up of multiple wires. Note that this embodiment describes a case where the tension member 17 is located in the center, but the same applies to other coated conductor wires.

[0066] 5(b), at least the tip of the conductor 13 can be compressed from the outer periphery to form the end processing portion 19. By compressing the tip of the conductor 13 from the outer periphery in this manner, the wire is prevented from coming apart, and it is easy to insert the wire into the tubular crimping portion 5.

[0067] 5(c), at least the tip of the conductor 13 may be plated all at once to form the end processing portion 19 with a plating layer 21. By plating the tip of the conductor 13 all at once from the outer periphery in this way, the wire is prevented from coming apart, and insertion into the tubular crimping portion 5 is facilitated.

[0068] Note that, depending on the plating method, high temperatures may be generated when plating is performed en bloc from the outer periphery of the conductor wires 13. If plating is performed en bloc after twisting the conductor wires 13 using such a plating method, the tensile members 17 may be deteriorated by the heat, resulting in a decrease in tensile strength.

[0069] In such cases, as shown in FIG. 5(d), a plating layer 21 may be formed on each conductor and then twisted around the outer periphery of the tension member 17. Alternatively, as shown in FIG. 6, a plating layer 21 may be formed on each conductor and then the tips of multiple conductors may be plated together from the outer periphery. In this case, the type of plating for each conductor may be different from the type of plating for all conductors. While batch plating can prevent conductors from coming apart, bundling conductors and plating them all at once may result in thick or thin areas of plating due to the shape of the conductors, etc. In contrast, applying a primer plating treatment to each conductor in advance can reduce this effect and enable approximately uniform batch plating.

[0070] The method of terminal treatment 19 is not limited to compression or plating, and for example, the tip of conductor 13 may be soldered or welded to prevent the wires from coming apart. Also, multiple terminal treatments, such as compression from the periphery and collective plating, may be used in combination.

[0071] Next, the coated conductor wire 11 whose tip has been treated in this manner is inserted from the rear end side of the tubular crimping portion 5 of the terminal 1. When the tip of the coated conductor wire 11 is inserted into the crimping portion 5, the exposed portion of the conductor wire 13 is located inside the conductor crimping portion 7, and the coating portion 15 is located inside the coating crimping portion 9. At this time, the tip of the conductor wire 13 may protrude from the tip of the conductor crimping portion 7.

[0072] 7(a) is a cross-sectional view showing an upper blade die 31a, a lower blade die 31b, etc., of a terminal crimping blade for manufacturing a terminal-fitted electric wire 10 before crimping, and FIG. 7(b) is a cross-sectional view showing the crimping portion 5 during crimping. The upper blade die 31a and the lower blade die 31b have a substantially semi-cylindrical cavity extending in the longitudinal direction. The upper blade die 31a includes an insulation crimping blade die 34 that corresponds to the insulation crimping portion 9 and has a diameter slightly smaller than the radius of the insulation crimping portion 9, and a conductor crimping blade die 32 that corresponds to the conductor crimping portion 7 and has a diameter smaller than the insulation crimping blade die 34. That is, the upper blade die 31a and the lower blade die 31b are formed so that both the portions that correspond to the conductor crimping portion 7 and the insulation crimping portion 9 have a substantially circular cross section when the terminal 1 is crimped.

[0073] The conductive portion 7b may be relatively longer than the wire holding portion 7a in order to ensure conductivity between the coated conductor wire 11 and the terminal 1. On the other hand, even if the wire holding portion 7a is short, the strength of the wire 13 or the tensile member 17 and the terminal 1 is sufficiently high as long as they are reliably brought into close contact with each other with an appropriate pressure, so the wire holding portion 7a may be relatively shorter than the conductive portion 7b.

[0074] As shown in FIG. 7(b), when the upper blade die 31a and the lower blade die 31b are engaged and the crimping portion 5 is compressed, the conductor crimping portion 7 is crimped to the conductor wire 13, and the insulation crimping portion 9 is crimped to the insulation portion 15. At this time, the wire holding portion 7a has the smallest inner diameter, followed by the conductive portion 7b, and the insulation crimping portion 9 has the largest inner diameter. In this manner, the electric wire with terminal 10 can be obtained. Furthermore, a wire harness can be obtained in which a plurality of electric wires with terminals are integrated, including the obtained electric wire with terminal 10.

[0075] As described above, the compression ratio of the wire holding portion 7a is smaller than that of the conductive portion 7b, and the compression ratio of the coating crimping portion 9 is smaller than that of the conductive portion 7b. Here, if the cross-sectional area of ​​the coating portion 15 before the crimping step (the total cross-sectional area inside the outer peripheral surface of the coating crimping portion 9) is A0 and the internal cross-sectional area of ​​the coating crimping portion 9 after being compressed by the upper blade die 31a and the lower blade die 31b is A2, then the compression ratio of the coating crimping portion 9 = A2 / A0 (%).

[0076] Similarly, if the cross-sectional area of ​​the conductor 13 before the crimping process (total cross-sectional area of ​​the conductor 13) is A1, and the cross-sectional areas of the conductive portion 7b and the wire holding portion 7a after being compressed by the upper blade die 31a and the lower blade die 31b (total cross-sectional area of ​​the conductor 13) are A3 and A4, respectively, then the compression ratio of the wire holding portion 7a = A4 / A1 (%), and the compression ratio of the conductive portion 7b = A3 / A1 (%).

[0077] Since the strength of the reinforcing members 17 is higher and they are less likely to deform than the conductor wires 13, the cross-sectional area of ​​the reinforcing members 17 does not decrease significantly during compression, and deformation (reduction in cross-sectional area) of the conductor wires 13 mainly progresses.

[0078] Furthermore, the movement of the strength member wires during compression causes the external shape of the strength member 17 to become uneven, increasing the contact area between the conductor 13 and the strength member 17 and increasing the frictional force. This makes it easier for tension to be transmitted from the conductor 13 to the strength member 17, and is expected to increase the strength of the conductor 13 when tension is applied.

[0079] Furthermore, since the amount of deformation of the strength members 17 is smaller than that of the conductor wires 13, breakage due to a reduction in cross-sectional area is unlikely to occur. In particular, since the conductor wire crimping portion 7 is tubular, the conductor wires 13 are compressed from the entire circumference, and the conductor wires 13 are positioned between the strength members 17 and the conductor wire crimping portion 7, and the strength members 17 and the conductor wire crimping portion 7 do not come into contact with each other, so the strength members 17 are not damaged.

[0080] As described above, according to this embodiment, the conductor crimping portion 7 has the electric wire holding portion 7a and the conductive portion 7b, so that the electric wire holding portion 7a can be crimped at a compression rate suitable for ensuring connection strength, and the conductive portion 7b can be crimped at a compression rate suitable for ensuring conductivity. In other words, the compression rates (amounts of compression) of the electric wire holding portion 7a and the conductive portion 7b can be made different, so that each portion can be crimped at a compression rate suitable for its purpose.

[0081] More specifically, by forming the tip end side (terminal body 3 side) of the conductor crimping portion 7 as the wire holding portion 7a, stronger crimping can be performed, ensuring high connection strength. At this time, it is acceptable for part of the conductor wire 13 to break. On the other hand, because the conductive portion 7b is located on the rear end side (covering portion 15 side) of the conductor crimping portion 7, even if part of the conductor wire 13 breaks at the wire holding portion 7a, electrical continuity between the covered conductor wire 11 and the terminal 1 can be ensured.

[0082] Furthermore, the wire holding portion 7a has a small inner diameter due to a plate-like member attached to its inner surface. Therefore, the compression ratios of the wire holding portion 7a and the conductive portion 7b can be appropriately adjusted by performing the crimping process in the same manner as crimping a regular terminal-attached wire. This simplifies the process. Furthermore, because the thick portion is formed on the inner surface, the outer surface after crimping does not have a step or other irregularity at the boundary between the wire holding portion 7a and the conductive portion 7b. This results in the same appearance as a regular terminal, with a superior appearance. Furthermore, because a step corresponding to the thickness of the plate-like member is formed on the underside of the tip of the wire crimping portion 7, the wire 13 exposed from the wire crimping portion 7 can deform not only upward but also downward at the step. Therefore, compared to when the underside of the wire crimping portion 7 is flat, upward deformation (expansion) of the wire 13 exposed from the tip of the wire crimping portion 7 can be suppressed.

[0083] The present invention is also applicable to coated conductor wires 11 that include reinforcing members 17, ensuring high connection strength even with small-diameter coated conductor wires 11. For example, even if the cross-sectional area of ​​the conductor wire 13 is 0.05 sq or less, the tensile strength of the conductor wire 13 at the wire holding portion 7a can be made 50 N or more. For example, when a coated conductor wire with a composite conductor cross-sectional area of ​​0.05 sq (conductor material: annealed copper, reinforcing member material: PBO fiber) was actually crimped at a conductor compression rate of 80%, favorable results were obtained, with a tensile strength of 50 N or more and a resistance of 0.75 mΩ or less.

[0084] In this case, since both the tension member 17 and the conductor wire 13 are crimped together by the wire holding portion 7a, there is no need to crimp the tension member 17 and the conductor wire 13 separately, and the crimping operation is easy. In the case of a coated conductor wire 11 including the tension member 17, by arranging the tension member 17 approximately in the center of the cross section and arranging the conductor wire 13 on the outer periphery, the terminal 1 and the conductor wire 13 can be reliably crimped together during crimping, and the terminal 1 and the conductor wire 13 can be brought into contact with each other.

[0085] Furthermore, since the conductor crimping portion 7 is substantially cylindrical, it can reliably crimp the conductor 13 from all around 360°. This makes it possible to prevent local stress (deformation) from occurring in the conductor 13 during crimping.

[0086] Here, when the conductor crimping portion 7 of the covered conductor wire 11, in which the conductor wire 13 is disposed around the tension member 17, is crimped, a compressive stress acts radially inside the conductor crimping portion 7. If this compressive stress is small, the frictional force at the contact surface between the conductor wire 13 and the tension member 17 will be smaller than the frictional force at the contact surface between the terminal 1 and the conductor wire 13. For this reason, when a tensile load is applied to the electric wire with terminal 10, the load will be concentrated on the conductor wire 13, making the conductor wire 13 more likely to break.

[0087] On the other hand, slippage occurs at the contact surface between the conductor 13 and the tension member 17, preventing compressive stress from acting on the tension member 17, which may result in the tension member 17 being pulled out without breaking, and the tensile strength of the tension member 17 not being fully exerted. To prevent this phenomenon and obtain sufficient compressive stress through crimping, the frictional force between the conductor 13 and the tension member 17 may be increased. For example, by providing irregularities on the inner surface of the conductor crimping portion 7, the compressive stress on the tension member 17 can be partially increased, preventing it from being pulled out.

[0088] Furthermore, when the conductor crimping portion 7 is cylindrical and has a brazed portion at the joint as in this embodiment, a brazed portion with low hardness will have a smaller compressive stress on the conductor 13, making it easier to pull out the strength member 17. For this reason, it is desirable to remove the brazed portion or to eliminate the brazed portion and make the hardness of the joint formed at the conductor crimping portion 7 equal to the hardness of the material in the conductor crimping portion 7.

[0089] (Second embodiment) Next, a second embodiment will be described. Fig. 8 is a perspective view of a terminal 1a according to the second embodiment before crimping. In the following description, components that have the same functions as those in the first embodiment are given the same reference numerals as in Figs. 1 to 7, and redundant description will be omitted.

[0090] The terminal 1a has a configuration similar to that of the terminal 1, but differs in the shape of the crimping portion 5. In the terminal 1a, the conductor crimping portion 7 and the insulation crimping portion 9 are both open barrel types with a generally U-shaped opening at the top. Even in this case, a plate-shaped member is disposed on a portion of the inner surface at the tip end of the conductor crimping portion 7. The plate-shaped member may be disposed up to the tip (upper end) of the barrel piece, but it is not necessary to dispose the plate-shaped member at the tip portion of the barrel piece. In other words, the circumferential length of the plate-shaped member may be shorter than the circumferential length of the conductor crimping portion 7 (the length between the tips of a pair of barrel pieces). In this case, the plate-shaped member may be tapered so that its thickness gradually decreases at both circumferential ends.

[0091] Fig. 9 is a perspective view showing a terminal-attached electric wire 10a in which a terminal 1a and a conductor 13 are crimped together via a coating, Fig. 10(a) is a cross-sectional view perpendicular to the axial direction of the conductive portion 7b, and Fig. 10(b) is a cross-sectional view perpendicular to the axial direction of the wire holding portion 7a. Note that in the illustrated example, the conductor 13 is disposed on the outer periphery of the tension member 17, but the tension member 17 is not necessarily required. In an open-barrel type conductor crimping portion 7, a pair of opposing barrel pieces are butted together at approximately the center in the width direction at the top of the conductor crimping portion 7 and folded into the interior of the conductor crimping portion 7 to crimp the conductor 13.

[0092] Even in this case, the wire holding portion 7a and the conductive portion 7b have approximately the same outer diameter (compressed height), and the wire holding portion 7a has an inner diameter (internal cross-sectional area) that is smaller than that of the conductive portion 7b by the thickness of the plate-like member, so the compression rate of the wire holding portion 7a is greater than that of the conductive portion 7b.

[0093] According to the second embodiment, the same effects as those of the first embodiment can be obtained. Furthermore, because the conductor crimping portion 7 is an open barrel type, for example, there is no need to insert the conductor 13 into a tubular crimping portion, and the conductor 13 can be easily placed on the conductor crimping portion 7 of the terminal 1a. This makes the crimping operation easier.

[0094] Furthermore, by making the tips of the barrel pieces protrude beyond the plate-like member (double portion), the inner plate-like member can prevent the outer barrel pieces from biting excessively into the internal conductor 13.

[0095] (Third embodiment) Next, a third embodiment will be described. Fig. 11 is a perspective view of a terminal 1b according to the third embodiment before crimping. Terminal 1b has substantially the same configuration as terminal 1, but differs in the shape of the crimping portion 5. In terminal 1b, a slit is formed between the wire holding portion 7a, the conductive portion 7b, and the insulation crimping portion 9. In other words, the wire crimping portion 7 and the insulation crimping portion 9 are formed separately.

[0096] Terminal 1b can also be crimped in the same manner as terminal 1. In this case, it is sufficient to crimp so that the end of cover 15 is positioned in the slit between conductor crimping portion 7 and cover crimping portion 9. In this way, by crimping conductor crimping portion 7 so as to form wire holding portion 7a and conductive portion 7b, the same effect as in the first embodiment can be obtained.

[0097] (Fourth embodiment) Next, a fourth embodiment will be described. Fig. 12 is an axial cross-sectional view of a terminal-fitted electric wire 10b using a terminal 1c according to the fourth embodiment. In the first to third embodiments, a plate-like member is arranged on the tip side of the conductor crimping portion 7 to form the thick-walled portion, the electric wire holding portion 7a. However, in this embodiment, the plate-like member is arranged on the rear end side (the coating crimping portion 9 side) of the conductor crimping portion 7. In other words, the thick-walled portion 7c is formed on the rear end side of the conductor crimping portion 7.

[0098] In this way, the thick portion 7c is formed by overlapping the plate-like member on at least a part of the inner surface of the wire crimping portion 7, but the thick portion 7c and the outer surface of other parts of the wire crimping portion 7 have approximately the same diameter (compressed height). Therefore, the compression rate of the thick portion 7c on the rear end side (covering portion 15 side) of the wire crimping portion 7 is smaller than the compression rate on the front end side (terminal body 3 side) of the wire crimping portion 7.

[0099] Next, a method for manufacturing the electric wire with terminal 10b will be described. Fig. 13 is a perspective view showing the terminal 1c and the coated conductor wire 11 before crimping. The crimping portion 5 of the terminal 1c is tubular and closed in the circumferential direction. The crimping portion 5 is formed, for example, by rolling a plate member, butting the ends together, and welding them together in the longitudinal direction. A plate member is disposed on at least a portion of the inner surface of the rear end side of the conductor crimping portion 7, forming a thick portion 7c. The thick portion 7c and the outer surface of the other parts of the conductor crimping portion 7 have approximately the same size (same diameter).

[0100] First, as described above, the coating 15 at the tip of the coated conductor wire 11 is stripped to expose the conductor wire 13 at the tip. Next, the tip of the coated conductor wire 11 is inserted into the crimping portion 5. At this time, a terminal processing portion may be formed at the tip of the conductor wire 13.

[0101] Next, the terminal 1c with the covered conductor wire 11 placed in the crimping portion 5 is set in a mold. FIGS. 14(a) and 14(b) are cross-sectional views showing the upper blade 31a, lower blade 31b, and other components of a terminal crimping blade for manufacturing a terminal-attached electric wire 10b during crimping. As described above, the upper blade 31a and lower blade 31b have a substantially semi-cylindrical cavity extending in the longitudinal direction. The upper blade 31a includes a cover crimping blade 34 that corresponds to the cover crimping portion 9 and has a diameter slightly smaller than the radius of the cover crimping portion 9, and a conductor crimping blade 32 that corresponds to the conductor crimping portion 7 and has a diameter smaller than that of the cover crimping blade 34. That is, the upper blade 31a and lower blade 31b are formed so that both the portions corresponding to the conductor crimping portion 7 and the cover crimping portion 9 have a substantially circular cross section when the terminal 1c is crimped.

[0102] As shown in FIG. 14(a), when the upper blade die 31a is lowered to start crimping, the thick-walled portion 7c starts to be crimped first before the other portions. That is, when crimping of the thick-walled portion 7c starts, the other portions of the conductor 13 on the tip side have not yet started to be crimped. The thick-walled portion 7c, which starts to be crimped first, is pressed more strongly than the other portions (parts of the tip side of the conductor crimping portion 7). Therefore, when the other portions are crimped, the extension (movement) of the conductor 13 is restricted compared to the other portions. Therefore, the conductor 13 preferentially extends toward the tip side, and extension toward the rear end side is restricted. As a result, the conductor 13 can be prevented from extending rearward of the conductor crimping portion 7 and spreading outward.

[0103] 14(b), when the upper blade die 31a is further lowered from this state, the upper blade die 31a and the lower blade die 31b mesh together, completely crimping the conductor crimping portion 7 to the conductor 13. That is, when the crimping portion 5 is compressed, the conductor crimping portion 7 is crimped to the conductor 13, and the insulation crimping portion 9 is crimped to the insulation portion 15.

[0104] For example, in the tubular conductor crimping portion 7, the conductor wire 13 is crimped into a substantially circular shape. That is, the terminal 1 is electrically connected to the covered conductor wire 11. Even in this case, as described above, the compression ratio A4 / A1 (%) of the thick-walled portion 7c is smaller than the compression ratio A3 / A1 (%) of the other portions, and the compression ratio A2 / A0 (%) of the cover crimping portion 9 is smaller than the compression ratio of the conductive portion 7b.

[0105] As described above, according to the fourth embodiment, as in the first to third embodiments, even when the same upper blade dies 31a and lower blade dies 31b as in the conventional methods are used, by forming the thick-walled portions 7c, it is possible to vary the compression amount depending on the location of the conductor crimping portion 7. Furthermore, in conventional methods, the conductor 13 deforms preferentially relative to the tensile strength members 17 during crimping, causing the conductor 13 to stretch toward the front and rear ends of the conductor crimping portion 7. However, as in the present embodiment, by starting crimping of the thick-walled portion 7c near the rear end of the conductor crimping portion 7 first, it is possible to prevent the conductor 13 from stretching toward the rear end, which is further toward the front end. This prevents the conductor 13 from spreading toward the rear end of the conductor crimping portion 7.

[0106] (Fifth embodiment) Next, a fifth embodiment will be described. Fig. 15 is a perspective view of a terminal 1d according to the fifth embodiment before crimping. Terminal 1d has a configuration similar to that of terminal 1c, but differs in the shape of the crimping portion 5. In terminal 1d, both the conductor crimping portion 7 and the insulation crimping portion 9 are open barrel types that are generally U-shaped and open at the top.

[0107] Even in this case, a plate-like member is disposed on a part of the inner surface on the rear end side of the conductor crimping portion 7. The plate-like member may be disposed up to the tip of the barrel piece, but it is not necessary to dispose a plate-like member at the tip portion of the barrel piece. In other words, the circumferential length of the plate-like member may be shorter than the circumferential length of the conductor crimping portion 7 (the length between the tips of a pair of barrel pieces). In this case, the plate-like member may be formed into a tapered shape so that its thickness gradually decreases at both circumferential ends.

[0108] According to the fifth embodiment, the same effects as those of the fourth embodiment can be obtained. Furthermore, since the conductor crimping portion 7 is an open barrel type, for example, there is no need to insert the conductor 13 into a tubular crimping portion, and the conductor 13 can be easily placed on the conductor crimping portion 7 of the terminal 1d. This makes the crimping operation easier.

[0109] Furthermore, by making the tips of the barrel pieces protrude beyond the plate-like member (double portion), the inner plate-like member can prevent the outer barrel pieces from biting excessively into the internal conductor 13.

[0110] (Sixth embodiment) Next, a sixth embodiment will be described. Fig. 16 is a perspective view of a terminal 1e according to the sixth embodiment before crimping. Terminal 1e has substantially the same configuration as terminal 1c, but differs in the shape of the crimping portion 5. In terminal 1e, slits are formed in the conductor crimping portion 7 between the thick-walled portion 7c and other portions, and between the conductor crimping portion 7 and the insulation crimping portion 9. In other words, the conductor crimping portion 7 and the insulation crimping portion 9 are formed separately.

[0111] Terminal 1e can also be crimped in the same manner as terminal 1c. In this case, it is sufficient to crimp so that the end of cover 15 is positioned in the slit between conductor crimping portion 7 and cover crimping portion 9. In this way, by forming thick portion 7c at the rear end side of conductor crimping portion 7 and crimping it, it is possible to obtain the same effect as in the fourth embodiment.

[0112] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not limited to the above-described embodiments. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the technical ideas described in the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention.

[0113] For example, the respective embodiments may be combined with each other. For example, the conductor crimping portion 7 may be cylindrical and the insulation crimping portion 9 may be an open barrel type.

[0114] Furthermore, although the embodiments have been described in which the plate-like members are disposed on the leading end side and the rear end side of the conductor crimping portion 7, the leading end side and the rear end side do not necessarily have to be the same as the leading end or the rear end of the conductor crimping portion 7 and the end of the plate-like member. For example, in the first to third embodiments, as in the terminal-attached electric wire 10c shown in FIG. 17(a), the thick-walled portion 7c of the terminal 1f may be slightly offset toward the axial center from the leading end of the conductor crimping portion 7. Similarly, in the fourth to sixth embodiments, as in the terminal-attached electric wire 10d shown in FIG. 17(b), the thick-walled portion 7c of the terminal 1g may be slightly offset toward the axial center from the rear end of the conductor crimping portion 7. Furthermore, the thick-walled portion may be formed by changing the thickness of the terminal material itself so that it protrudes toward the inner surface, rather than by attaching a plate-like member to the terminal material. [Explanation of symbols]

[0115] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g... Terminals 3...Terminal body 4. Transition section 5... Crimping part 7....Conductor crimping section 7a……Wire holding part 7b……Conducting part 7c……Thick part 9……Sheathing crimping part 10, 10a, 10b, 10c, 10d...wires with terminals 11....Covered conductor 12...Composite conductor 13……Conducting wire 15....Covering part 17……Tensile strength body 19...Terminal processing section 21: Plating layer 31a……Top blade type 31b……Lower blade type 32....Conductor crimping blade type 34……Coated crimp blade type

Claims

1. A terminal-attached electric wire in which a coated conductor wire and a terminal are electrically connected, the terminal includes a conductor crimping portion to which the conductor exposed from the coating portion at the tip of the coated conductor wire is crimped, and a coating crimping portion to which the coating portion of the coated conductor wire is crimped, a thick-walled portion that is thicker than other portions of the inner surface of the conductor crimping portion in an axial direction of the conductor crimping portion is formed; the compressibility of the thick-walled portion is smaller than the compressibility of the other portion of the conductor crimping portion, the thick-walled portion is formed on a front end side of the conductor crimping portion, a wire holding portion for holding the conductor wire is provided on the front end side of the conductor crimping portion, and a conductive portion for establishing electrical continuity with the conductor wire is provided on a rear end side of the conductor crimping portion, The wire holding portion is thicker than the conductive portion, At least a portion of the conductor is broken in the electric wire holding portion, The wire holding portion holds the conductor wire, the conductor wire being at least partially broken, The conductive wire is not broken at the conductive portion, The electric wire with terminal, wherein the electrical resistance of the conductor in the conductive portion is lower than the electrical resistance of the conductor in the electric wire holding portion.

2. 2. The electric wire with terminal according to claim 1, wherein the coated conductor wire comprises a plurality of the conductor wires and at least one tensile strength member, and the wire holding portion holds both the conductor wire, at least a portion of which is broken, and the tensile strength member.

3. 3. The electric wire with terminal according to claim 1, wherein the thick portion and the other portion of the conductor crimping portion are compressed so that the outer surface dimensions in a direction perpendicular to the axial direction are approximately the same along the axial direction.

4. 3. The electric wire with terminal according to claim 2, wherein, in a cross section perpendicular to the longitudinal direction of the covered conductor, the strength member is located approximately at the center of the covered conductor, and the conductor is arranged on the outer periphery of the strength member.

5. The electric wire with terminal according to any one of claims 1 to 4, wherein the cross-sectional area of ​​the conductor is 0.35 sq or less.

6. 6. The electric wire with terminal according to claim 1, wherein the conductor crimping portion has a tubular shape that is closed in the circumferential direction, and the thick-walled portion is formed around the entire inner surface of the conductor crimping portion.

7. 6. The electric wire with terminal according to claim 1, wherein the conductor crimping portion is an open barrel type, the thick-walled portion has a circumferential length shorter than the circumferential length of the conductor crimping portion, and the thick-walled portion has a tapered shape such that its thickness gradually decreases at both circumferential ends.

8. A wire harness comprising a plurality of electric wires with terminals integrated together, the electric wire with terminal being the electric wire according to any one of claims 1 to 7.

9. A terminal electrically connected to a coated conductor wire, a conductor crimping portion to which the conductor exposed from the coating portion at the tip of the coated conductor wire is crimped, and a coating crimping portion to which the coating portion of the coated conductor wire is crimped, the conductor crimping portion has a tubular shape that is closed in the circumferential direction, a thick-walled portion that is thicker than other portions is formed on at least a portion of the inner surface of the conductor crimping portion, and the diameter of the thick-walled portion and the other portions of the outer surface of the conductor crimping portion are approximately the same size; The thick portion is formed on a tip side of the conductor crimping portion, The terminal is characterized in that the thick portion is formed around the entire inner periphery of the conductor crimping portion.

10. A terminal electrically connected to a coated conductor wire, a conductor crimping portion to which the conductor exposed from the coating portion at the tip of the coated conductor wire is crimped, and a coating crimping portion to which the coating portion of the coated conductor wire is crimped, the conductor crimping portion is an open barrel type; a thick portion that is thicker than other portions is formed on at least a portion of the inner surface side of the conductor crimping portion, and the outer surface of the thick portion and other portions of the conductor crimping portion have substantially the same shape; The thick portion is formed on a tip side of the conductor crimping portion, A terminal characterized in that the circumferential length of the thick-walled portion is shorter than the circumferential length of the conductor crimping portion, and the thick-walled portion has a tapered shape such that its thickness gradually decreases at both circumferential ends.

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