JP2022008122A - Terminal-equipped electric wire, wiring harness, terminal, and manufacturing method of terminal-equipped electric wire - Google Patents

Abstract

To provide a terminal-equipped electric wire and the like, having excellent crimping workability and capable of easily positioning a conducting wire.SOLUTION: A terminal-equipped electric wire 10 is constituted by a terminal 1 and a coated conductive wire 11 which are electrically connected to each other. A crimp part 5 of the terminal 1 is crimped to the coated conductive wire 11, and has a conductive wire crimp part 7 which is crimped to a conductive wire 13 that is exposed from a coating 15 on a front-end side of the coated conductive wire 11 and a coating crimp part 9 which is crimped to the coating 15 of the coated conductive wire 11. In other words, the conducting wire 13 which is exposed by removing the coating 15 therefrom is crimped by the conductive wire crimp part 7, and the conducting wire 13 and the terminal 1 are electrically connected to each other. In at least a part between the coating crimp part 9 and the conductive wire crimp part 7, a conducting wire positioning portion 8 is formed, which decreases in size (height) as it approaches a tip side (conductive wire crimp part 7 side). On an inner surface of the conducting wire positioning portion 8, a tip of the coating 15 comes into contact therewith and thereby an insertion allowance of the conducting wire 13 into the conductive wire crimp part 7 is regulated.SELECTED DRAWING: Figure 2

Description

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

Usually, a wire harness for an automobile is bundled after a crimp terminal is connected to a conductor of a coated conductor wire, and is arranged as a signal line of an automobile or the like. In a general coated conductor and crimp terminal, the coating on the tip of the coated conductor is removed, the exposed conductor and the wire crimping portion are crimped, and the covering portion is crimped and connected by the coated crimping portion. The wire harness for automobiles satisfies the requirement of the connection strength between the crimp terminal and the coated lead wire by the sum of the connection strength of the wire crimping portion and the connection strength of the coated crimping portion.

Here, when the electric wire used becomes thin, it is difficult to maintain the strength only by the conductor constituting the electric wire, so an electric wire containing a tensile strength body is being studied. For example, when an electric wire made of a conductor having a tensile strength of about 30 N is used, the electric wire containing a tensile strength body is made of metal or non-metal in order to secure a tensile strength exceeding 80 N required for an automobile electric wire. It has been proposed that a conducting wire is spirally wound around the outer circumference of the tensile strength body. For such electric wires, the conductor is stripped off, the tensile strength body is exposed and inserted into the sleeve, the tensile strength body is crimped with a steel clamp, and the conductor portion is integrated with a curable resin such as an adhesive. There is a method of crimping with a clamp made of aluminum or the like (Patent Documents 1 and 2).

Jitsukaisho 61-046827 Gazette Japanese Unexamined Patent Publication No. 8-237389

In recent years, especially in the field of automobiles, the number of ECUs and sensors has increased due to the support of CASE and the like, and the number of electric wires used has increased remarkably accordingly. Under such circumstances, increasing the wire diameter of the wire harness becomes an issue. Therefore, there is a demand for a smaller diameter electric wire for automobiles. For example, a conventional electric wire having a small diameter of 0.35 sq (meaning sq: mm ² ) or less is required.

However, when connecting a conventional electric wire containing a tensile strength body, a step stripping operation and a crimping process of crimping the tensile strength body and crimping a conducting wire are required. Therefore, the number of parts is large, the work man-hours are increased, and the cost is high. Especially when the diameter of the electric wire becomes small, the step peeling itself becomes difficult. As described above, the conventional method has a problem that the processing cost increases because the manufacturing process becomes complicated and difficult.

Here, if the conductor crimping portion is tubular, the conductor can be compressed from the entire circumference, so that local deformation of the conductor is suppressed. However, as the diameter of the electric wire becomes smaller, it becomes difficult to insert the electric wire into the tubular crimping portion. In addition, it becomes difficult to confirm whether or not the conductor is arranged at the conductor crimping portion. For example, when a coated conductor is inserted into a tubular crimping portion and crimped, it is difficult to visually position the crimping of the conductor because the inserted conductor cannot be seen from the outside of the terminal.

The present invention has been made in view of such a problem, and an object of the present invention is to provide an electric wire with a terminal, which is easy to position a conducting wire and has good crimping workability.

In order to achieve the above-mentioned object, the first invention is an electric wire with a terminal in which a coated wire and a terminal are electrically connected, and the terminal is crimped by a wire exposed from a covered portion at the tip of the coated wire. A wire crimping portion to be formed and a coated crimping portion to which the coated portion of the coated wire is crimped are provided, and at least a part of the wire crimping portion is a tubular shape closed in the circumferential direction, and the wire crimping portion is provided. In at least a part between the covering crimping portion and the covering crimping portion, a lead wire positioning portion whose size decreases toward the tip side is formed, and in the lead wire positioning portion, the tip of the covering portion comes into contact with the lead wire crimping portion. It is an electric wire with a terminal, characterized in that the insertion allowance of the lead wire is regulated.

The coated conductor may be composed of a plurality of the conductors and at least one tensile strength body.

In a cross section perpendicular to the longitudinal direction of the coated conductor, the tensile strength may be located substantially at the center of the coated conductor, and the conductor may be arranged on the outer peripheral portion of the tensile strength. Further, the conductor may be twisted in the longitudinal direction of the coated conductor.

At least the tip end portion of the conducting wire may be compressed from the outer peripheral side, or may be plated collectively from the outer peripheral side of the conducting wire.

The conductor has a cross-sectional area of 0.35 sq or less, and the terminal may be capable of crimping the conductor having a cross-sectional area of 0.35 sq or less, and further, the cross-sectional area of the conductor is 0.3 sq or less. The terminal may be capable of crimping the conducting wire having a cross-sectional area of 0.3 sq or less.

According to the first invention, since at least a part of the conductor crimping portion is tubular, the conductor can be reliably crimped from the entire circumference. Therefore, it is possible to suppress the occurrence of local stress (deformation) on the conductor during crimping. Further, since a conductor positioning portion whose size decreases toward the tip side is formed between the conductor crimping portion and the covering crimping portion, when the coated conducting wire is arranged in the crimping portion, the tip of the covering portion is formed in the conducting wire positioning portion. Upon contact, the insertion allowance of the conductor into the conductor crimping portion is restricted. Therefore, it is not necessary to visually confirm the crimping position, it is easy to position the coated conductor to the terminal in the longitudinal direction, the crimping position is stabilized in the production process, and the productivity is improved.

Further, since the coated conductor has at least one conductor and a tensile strength body, the tensile strength of the conductor wire can be ensured by the tensile strength body. At this time, if both the conductor and the tensile strength are held by the conductor crimping portion, high connection strength can be ensured. Further, unlike the conventional case, it is not necessary to connect the tensile strength body and the conducting wire with separate clamps, so that the number of parts is small and the connection work is easy.

Further, if the conductor is arranged on the outer peripheral portion of the central tensile strength body in the cross section perpendicular to the longitudinal direction of the coated conductor, the conductor can be reliably crimped. At this time, the conducting wire may be twisted in the longitudinal direction on the outer peripheral portion of the tensile strength body.

Further, the tip of the conductor is tubular because the terminal processing portion is formed such that the tip of the conductor is compressed from the outer peripheral side or the outer periphery of the conductor is plated all at once. It is possible to prevent the conductor from coming apart when it is inserted into the conductor crimping portion.

Further, the present invention is particularly effective when a coated conductor having a small diameter of 0.35 sq or less in the cross-sectional area of the conductor and a coated conductor having a small diameter of 0.3 sq or less in the cross-sectional area of the conductor are used. ..

The second invention is a wire harness characterized by integrating a plurality of terminald electric wires including the terminald electric wire according to the first invention.

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

The third invention is a terminal that is electrically connected to the coated conductor, and the conductor crimping portion to which the conductor exposed from the coated portion at the tip of the coated conductor is crimped and the coated portion of the coated conductor are crimped. The conductor crimping portion is tubular and is closed in the circumferential direction, and the size of the conductor crimping portion is increased toward the tip side in at least a part between the conductor crimping portion and the coating crimping portion. It is a terminal characterized in that a small conductor positioning portion is formed.

According to the third invention, since the position of the coated conductor is easy, the crimping operation is easy.

The fourth invention is the method for manufacturing an electric wire with a terminal according to the first invention, in which the size of the conductor positioning portion is larger than the inner diameter of the covering portion and is larger than the outer diameter of the covering portion before crimping. It is also small, and is a method for manufacturing an electric wire with a terminal, characterized in that the tip of the coated conductor is inserted until the tip of the coated portion comes into contact with the conductor positioning portion, and the crimped portion of the conductor is crimped.

According to the fourth invention, the electric wire with a terminal can be obtained by surely crimping the electric wire with the electric wire crimping portion.

According to the present invention, it is possible to provide an electric wire with a terminal, which is easy to position a conducting wire and has good crimping workability.

The perspective view which shows the electric wire 10 with a terminal. The cross-sectional view which shows the electric wire 10 with a terminal. (A) to (c) are cross-sectional views of the electric wire holding portion 7a. The figure which shows the terminal 1 and the coated conductor wire 11 before crimping. (A) is a diagram showing the tip of the conductor 13, (b) is a diagram showing the tip of the conductor 13 before terminal processing, and (c) and (d) are diagrams showing the form of the terminal processing unit 19. .. (A) and (b) are diagrams showing the form of another terminal processing unit 19. (A) and (b) are diagrams showing a process of inserting a conductor 13 into a conductor crimping portion 7. (A) and (b) are views showing the crimping process of the crimping portion 5. The figure which shows the terminal 1a and the coated conductor wire 11 before crimping. (A) and (b) are diagrams showing a process of inserting a conductor 13 into a conductor crimping portion 7. (A) and (b) are views showing the cross section of another coated conductor wire 11.

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

The coated lead wire 11 includes, for example, a lead wire 13 made of copper, a copper alloy, aluminum, or an aluminum alloy, and a covering portion 15 that covers the lead wire 13. That is, the coated conductor 11 includes a coated portion 15 and a conductor 13 exposed from the tip thereof.

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

The terminal body 3 is formed by forming a plate-shaped material having a predetermined shape into a tubular body having a rectangular cross section. The terminal body 3 has an elastic contact piece formed by folding a plate-shaped material into a rectangular cylinder. The terminal body 3 is connected by inserting a male terminal or the like from the front end portion. In the following description, an example is shown in which the terminal body 3 is a female terminal that allows insertion of an insertion tab (not shown) such as a male terminal, but in the present invention, the detailed shape of the terminal body 3 is shown. Is not particularly limited. For example, instead of the female terminal body 3, a male terminal insertion tab may be provided, or a bolt fastening portion such as a round terminal may be provided.

The crimping portion 5 of the terminal 1 is a portion to be crimped to the coated conductor wire 11, and the conductor wire crimping portion 7 for crimping the conductor wire 13 exposed from the coated conductor portion 15 to the tip end side of the coated conductor wire 11 and the coated portion 15 of the coated conductor wire 11. It has a coated crimping portion 9 for crimping. That is, the conductor 13 exposed by peeling off the covering portion 15 is crimped by the conductor crimping portion 7, and the conductor 13 and the terminal 1 are electrically connected. Further, the coated portion 15 of the coated conducting wire 11 is crimped by the coated crimping portion 9 of the terminal 1. In the present embodiment, the lead wire crimping portion 7 and the covering crimping portion 9 are tubular (substantially cylindrical) closed in the circumferential direction.

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

At least a part between the coated crimping portion 9 and the conducting wire crimping portion 7 is formed with a conducting wire positioning portion 8 whose size (height) decreases toward the tip side (lead wire crimping portion 7 side). On the inner surface of the conductor positioning portion 8, the tip of the covering portion 15 comes into contact with the lead wire positioning portion 8, and the insertion allowance of the conductor wire 13 into the conductor wire crimping portion 7 is restricted. The details of the insertion step of the conducting wire 13 will be described later.

An electric wire holding portion 7a having a relatively strong holding force of the conducting wire 13 is provided on the tip end side (terminal main body 3 side) of the conducting wire crimping portion 7. Further, a conducting portion 7b for obtaining continuity with the conducting wire 13 is formed on the rear end side (covered crimping portion 9 side) of the conducting wire crimping portion 7. That is, the wire crimping portion 7 has a wire holding portion 7a and a conductive portion 7b.

The tensile strength (connection strength) of the conductor 13 in the wire holding portion 7a is stronger than the tensile strength (connection strength) of the conductor 13 in the conductive portion 7b. For example, the compressibility in the wire holding portion 7a (cross-sectional area of the conductor 13 after compression / cross-sectional area of the conductor 13 before compression) is smaller than the compressibility in the conductive portion 7b. That is, the amount of compression in the wire holding portion 7a is larger than the amount of compression in the conductive portion 7b, and the wire holding portion 7a is strongly crimped.

In this way, since the wire holding portion 7a is strongly crimped, at least a part of the conducting wire 13 may be broken. Although the electrical resistance increases when a part of the conducting wire 13 breaks, a part of the fiber of the tensile strength body 17 enters into the gap of the broken conducting wire 13 to increase the pull-out resistance of the conducting wire 13 and connect strength. Can be secured. On the other hand, in the conductive portion 7b, the conducting wire 13 is not broken in order to keep the electric resistance low.

The compressibility of the covering crimping portion 9 (cross-sectional area of the covering portion 15 after compression / cross-sectional area of the covering portion 15 before compression) may be smaller than the compressibility of the conductive portion 7b. That is, the amount of compression in the covering crimping portion 9 may be larger than the amount of compression in the conductive portion 7b. Even in this case, the outer diameter of the covering crimping portion 9 is larger than the outer diameter of the conductive portion 7b due to the thickness of the covering portion 15. The electric wire holding portion 7a and the conductive portion 7b may be separated by a slit or the like. Further, the wire crimping portion 7 may be crimped at a constant compressibility without being divided into the wire holding portion 7a and the conductive portion 7b.

FIG. 3A is a diagram showing a cross section of the electric wire holding portion 7a. In the example shown in FIG. 3A, the conductor 13 is composed of seven strands. In the wire holding portion 7a, the conducting wire 13 is compressed into a substantially circular shape and crimped. The shape of the 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.

The number of strands of the conductor 13 is not particularly limited. For example, as shown in FIG. 3B, the number of strands may be 16. It is desirable that the strands are twisted together.

Further, in the coated conducting wire 11, at least one conducting wire 13 and a tensile strength body may be covered with a covering portion 15. The tensile strength body is a member that receives tension with respect 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 11, at least one tensile strength body 17 is located substantially in the center of the coated conductor 11, and a plurality of conductors 13 are the tensile strength bodies 17. It may be arranged on the outer peripheral portion of the. At this time, each of the conductors 13 (wires) arranged on the outer periphery of the tensile strength body 17 may be a conductor 13 (wire) having the same cross-sectional area and the same shape. Further, the conducting wire 13 may be spirally twisted in the longitudinal direction of the coated conducting wire 11 on the outer peripheral portion of the tensile strength body 17. In this case, in the electric wire holding portion 7a and the conductive portion 7b, both the conducting wire 13 and the tensile strength body 17 are crimped and held.

The arrangement of the tensile strength body 17 is not limited to the example shown in FIG. 3 (c). For example, the conductor 13 and the tensile strength body 17 may be arranged so as to be twisted together. Further, a plurality of conductors 13 in which the tensile strength body 17 is covered with a conductor may be twisted together. Further, the conductor may be arranged so as to cover the outer periphery of the central tensile strength body 17. That is, in the case of the coated conducting wire 11 containing the tensile strength body, the cross-sectional form thereof is not particularly limited as long as it has at least one conducting wire and at least one tensile strength body. The tensile strength body 17 may be a single (integral) tensile strength wire, or may be composed of a plurality of strands.

Here, it is desirable that the cross-sectional area of the conductor 13 (total cross-sectional area of the strands) is 0.35 sq or less, and in this case, the terminal 1 crimps the conductor 13 having a cross-sectional area of 0.35 sq or less. It is desirable to be possible. Further, it is desirable that the cross-sectional area of the conductor 13 (total cross-sectional area of the strands) is 0.3 sq or less, and in this case, the terminal 1 crimps the conductor 13 having a cross-sectional area of 0.3 sq or less. It is desirable to be possible. Further, for example, when the conductor 13 is used together with the tensile strength body 17, the cross-sectional area of the conductor 13 may be 0.05 sq or less. The smaller the cross-sectional area of the conducting wire 13, the greater the effect of this embodiment.

The tensile strength body 17 may be a metal wire such as a steel wire, or may be a resin or a fiber reinforced resin. Further, as described above, the tensile strength body 17 may be a single wire or a bundle of a plurality of fibers such as aramid fibers. By using such a tensile strength body 17, for example, even if the cross-sectional area of the conducting wire 13 is 0.05 sq or less, it is possible to secure 50 N or more as the tensile strength of the conducting wire in the wire holding portion 7a.

Next, a method of manufacturing the electric wire 10 with a terminal will be described. FIG. 4 is a perspective view showing the terminal 1 and the coated 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 a tubular shape that is closed in the circumferential direction. The lead wire crimping portion 7 may be joined by, for example, rolling the plate members and abutting the ends thereof in the longitudinal direction by welding or brazing, or by expanding the tubular member to form the terminal 1.

First, as described above, the coated portion 15 at the tip of the coated conductor 11 is peeled off to expose the conductor 13 at the tip. Next, as shown in FIG. 5A, the terminal processing portion 19 may be formed at the tip end portion of the conducting wire 13 before being inserted into the crimping portion 5 of the terminal 1. The terminal processing unit 19 is a processing unit that integrates the strands of the conductor 13 so that they do not come apart.

FIG. 5B is a diagram showing the shape of the tip of the conducting wire 13 before the terminal processing. In the present embodiment, the tensile strength body 17 is arranged substantially in the center when viewed from the tip of the coated conductor wire 11, and the conductor wire 13 is arranged on the outer periphery thereof. The conductor 13 is composed of a plurality of strands. In this embodiment, the case where the tensile strength body 17 is provided in the center will be described, but the same applies to other coated conductors.

In such a case, as shown in FIG. 5C, the terminal processing unit 19 can be formed by compressing at least the tip portion of the conducting wire 13 from the outer peripheral side. As described above, the tip portion of the conducting wire 13 is compressed from the outer peripheral side, so that the strands are prevented from being loosened and can be easily inserted into the tubular crimping portion 5.

Further, as shown in FIG. 5D, at least the tip end portion of the conducting wire 13 may be collectively subjected to a turning treatment to form the terminal processing portion 19 by the plating layer 21. As described above, since the tip portion of the conducting wire 13 is collectively plated from the outer periphery, the strands are prevented from being loosened, and it is easy to insert the conductor into the tubular crimping portion 5.

In addition, when the plating process is performed collectively from the outer periphery of the conducting wire 13, the temperature may become high depending on the plating method. If batch plating is performed after twisting the conducting wire 13 by such a plating method, the tensile strength body 17 may be deteriorated by heat and the tensile strength may be lowered.

In such a case, as shown in FIG. 6A, a plating layer 21 may be formed for each conductor and then twisted around the outer periphery of the tensile strength body 17. Further, as shown in FIG. 6B, a plating layer 21 may be formed for each conductor, and further, the tip portions of a plurality of conductors may be collectively plated from the outer periphery. In this case, the type of plating for each conductor and the type of batch plating may be changed. It is possible to suppress the dispersal of conductors by performing batch plating, but if the conductors are bundled and plated collectively, due to the influence of the shape of the conductor, etc., the part with thick plating may be partially plated. There is a risk that thin parts will be created. On the other hand, by performing the base plating treatment for each conductor in advance, this influence can be reduced and substantially uniform batch plating can be performed.

The terminal processing unit 19 is not limited to the method by compression or plating, and may, for example, suppress the dispersal of the strands by soldering or welding the tip of the conducting wire 13. Further, a plurality of terminal processes such as compression from the outer circumference and batch plating may be used in combination. In the following description, the illustration of the terminal processing unit 19 will be omitted.

FIG. 7A is a vertical sectional view showing a step of inserting the coated conductor wire 11 from the rear end of the crimping portion 5. The inner diameter of the covering crimping portion 9 is larger than the outer diameter of the covering portion 15. Further, the covering crimping portion 9 is higher in height than the lead wire crimping portion 7. That is, a conductor positioning portion 8 whose height gradually decreases toward the conductor crimping portion 7 is formed between the covering crimping portion 9 and the conductor crimping portion 7. The conductor positioning portion 8 may be formed not in the height direction but in the width direction, or may be formed in both of them. That is, the conductor positioning portion 8 is formed so that the size of the conductor positioning portion 8 becomes smaller toward the tip side with respect to the covering crimping portion 9.

From this state, as shown in FIG. 7B, when the coated conductor wire 11 is further inserted into the crimping portion 5, the tip of the coated conductor portion 15 comes into contact with the conductor wire positioning portion 8. Here, the inner diameter of the conductor crimping portion 7 before crimping is larger than the outer diameter of the conductor 13 and smaller than the outer diameter of the covering portion 15. That is, before crimping, the size of the conductor positioning portion 8 is larger than the inner diameter of the covering portion 15 (outer diameter of the conducting wire 13) and smaller than the outer diameter of the covering portion 15. Therefore, the tip of the covering portion 15 comes into contact with the inner surface of the conducting wire positioning portion 8.

In this way, when the tip of the coated conductor 11 is inserted into the crimping portion 5 until the tip of the covering portion 15 comes into contact with the conducting wire positioning portion 8, the exposed portion of the conducting wire 13 is located inside the conducting wire crimping portion 7, and the covering crimping is performed. The covering portion 15 is located inside the portion 9. At this time, the tip of the conductor 13 may protrude from the tip of the conductor crimping portion 7. In this way, the insertion allowance of the conductor 13 into the conductor crimping portion 7 can be restricted, and the conductor 13 can be reliably and reproducibly arranged at a predetermined position of the conductor crimping portion 7.

Next, the terminal 1 in which the coated conductor 11 is arranged in the crimping portion 5 is set in a blade shape. FIG. 8A is a cross-sectional view showing the upper blade type 31a, the lower blade type 31b, etc. before crimping the terminal crimping blade type for manufacturing the electric wire 10 with terminals, and FIG. 8B is crimping during crimping. It is sectional drawing which shows the part 5. The upper blade type 31a and the lower blade type 31b have a substantially semi-cylindrical cavity extending in the longitudinal direction. Further, the upper blade type 31a includes a coated crimping blade type 34 having a shape corresponding to the tubular coated crimping portion 9, and a conducting wire crimping blade type 32a and 32b corresponding to the tubular conducting wire crimping portion 7. That is, the upper blade type 31a and the lower blade type 31b are formed so that the crimping portion 5 after crimping has a substantially circular cross section.

The wire crimping blade type 32a is a blade type corresponding to the electric wire holding portion 7a, and the wire crimping blade type 32b is a blade type corresponding to the conductive portion 7b. That is, the diameter of the wire crimping blade type 32a is smaller than the diameter of the wire crimping blade type 32b, and the distance between the upper blade type 31a and the lower blade type 31b of the portion corresponding to the wire holding portion 7a corresponds to the conductive portion 7b. It is narrower than the distance between the upper blade type 31a and the lower blade type 31b of the portion.

The length of the conductive portion 7b may be relatively longer than that of the electric wire holding portion 7a in order to ensure the continuity between the coated lead wire 11 and the terminal 1. On the other hand, even if the length of the wire holding portion 7a is short, if the conducting wire 13 or the tensile strength body 17 and the terminal 1 are in close contact with each other at an appropriate pressure, the strength of both is sufficiently high. The length of 7a may be relatively shorter than that of the conductive portion 7b.

As shown in FIG. 8B, when the upper blade mold 31a and the lower blade mold 31b are engaged with each other and the crimping portion 5 is compressed, the conductor crimping portion 7 is crimped to the conductor wire 13, and the covering crimping portion 9 is a covering portion. It is crimped to 15. At this time, the wire holding portion 7a has the smallest diameter, then the conductive portion 7b has the smallest diameter, and the covering crimping portion 9 has the largest diameter. From the above, the electric wire 10 with a terminal can be obtained. Further, it is possible to obtain a wire harness in which a plurality of electric wires with terminals are integrated, including the obtained electric wire with terminals 10.

As described above, the compressibility of the electric wire holding portion 7a is smaller than the compressibility of the conductive portion 7b, and the compressibility of the covering crimping portion 9 is smaller than the compressibility of the conductive portion 7b. Here, the cross-sectional area of the covering portion 15 before the crimping step (the total cross-sectional area inside the outer peripheral surface of the covering crimping portion 9) is set to A0, and the covering crimping portion after being compressed by the upper blade mold 31a and the lower blade mold 31b. Assuming that the cross-sectional area inside the 9 is A2, the compression ratio of the covering crimping portion 9 = A2 / A0 (%).

Similarly, the cross-sectional area of the lead wire 13 before the crimping step (in the case where the tensile strength body is included, the total cross-sectional area of the lead wire 13 including the tensile strength body) is set to A1, and is compressed by the upper blade type 31a and the lower blade type 31b. Assuming that the cross-sectional areas inside the conductive portion 7b and the wire holding portion 7a (the total cross-sectional area of the lead wire 13 including the tensile strength body when the tensile strength body is included) are A3 and A4, respectively, the wire holding portion 7a is compressed. The rate = A4 / A1 (%), and the compression rate of the conductive portion 7b = A3 / A1 (%). When the entire wire crimping portion 7 is compressed under certain conditions, only one of the wire crimping blades 32a and 32b may be used.

Since the tensile strength body 17 has higher strength and is less likely to be deformed than the conducting wire 13, the cross-sectional area of the tensile strength body 17 does not significantly decrease during compression, and the deformation of the conducting wire 13 (decrease in cross-sectional area) mainly progresses. ..

Here, when the tensile strength body 17 is formed of a plurality of strands, each strand is finer than the conductor constituting the conductor 13, and is between the tensile strength strands and the tensile strength strands. It is difficult to clearly distinguish the gaps. Therefore, the cross-sectional area of the tensile strength body 17 before crimping is the area of the region of the tensile strength body surrounded by the conductor 13. In this case, in the early stage of compression, the deformation of the lead wire 13 progresses while the tensile strength body is deformed so as to reduce the gap between the strands of the tensile strength body. The cross-sectional reduction of 13 mainly progresses. Therefore, the compressibility of the conductor 13 after crimping is equal to or less than the apparent compressibility of the region where the tensile strength body 17 is arranged. The area ratio of the conductor wire 13 and the tensile strength body 17 after compression changes depending on the compression ratio of the entire electric wire.

Further, due to the movement of the tensile strength body wire during compression, the outer shape of the tensile strength body 17 becomes uneven, so that the contact area between the conducting wire 13 and the tensile strength body 17 increases and the frictional force increases. Therefore, the force is easily transmitted from the conductor 13 to the tensile strength body 17 with respect to the tension, and it is expected that the strength will increase when the tensile force is applied to the conductor 13.

Since the tensile strength body 17 has a smaller amount of deformation than the conducting wire 13, it is unlikely to break due to a decrease in the cross-sectional area. In particular, since the conductor crimping portion 7 is tubular, the conductor 13 is compressed from the entire circumference, the conductor 13 is arranged between the tensile strength body 17 and the conductor crimping portion 7, and the tensile strength body 17 and the conductor crimping portion 7 do not come into contact with each other. Therefore, the tensile strength body 17 is not damaged.

At the time of compression, a part of the strands constituting the tensile strength body 17 may enter between the conducting wires 13, and a part of the tensile strength body 17 may come into contact with the conducting wire crimping portion 7. As described above, it is desirable that the tensile strength body 17 and the wire crimping portion 7 do not come into contact with each other, but a part of the tensile strength body 17 may slightly contact the wire crimping portion 7. For example, if the peripheral length of the tensile strength body 17 in contact with the wire crimping portion 7 is 30% or less of the total outer peripheral length of the tensile strength body 17 in an arbitrary cross section, the damage suppressing effect of the tensile strength body 17 can be obtained. Can be done.

As described above, according to the present embodiment, since the conductor positioning portion 8 is provided in the terminal 1, the tip of the covering portion 15 abuts on the conducting wire positioning portion 8 when the coated conducting wire 11 is inserted into the crimping portion 5. As a result, the conductor 13 is automatically arranged at a position suitable for crimping. Therefore, it is not necessary to visually confirm the arrangement of the conductor 13 and the crimping position, and the conductor 13 can be reliably arranged at the predetermined position of the conductor crimping portion 7 with good reproducibility. Further, since the conductor crimping portion 7 is tubular, it can be reliably crimped from the entire circumference of the conductor 13 at 360 °.

Here, in the conductor crimping portion 7 of the coated conductor 11 in which the conductor 13 is arranged around the tensile strength body 17, when crimping is performed, a compressive stress acts in the radial direction inside the conductor crimping portion 7. When this compressive stress is small, the frictional force on the contact surface between the conductor 13 and the tensile strength body 17 becomes smaller than the frictional force on the contact surface between the terminal 1 and the conductor 13. Therefore, when a tensile load is applied to the electric wire 10 with terminals, the load is concentrated on the conductor 13, and the conductor 13 is likely to break.

On the other hand, slippage occurs on the contact surface between the lead wire 13 and the tensile strength body 17, compressive stress does not act on the tensile strength body 17, a phenomenon occurs in which the tensile strength body 17 comes off without cutting, and the tensile strength of the tensile strength body 17 is sufficient. It may not be expressed in. In order to prevent the above phenomenon and obtain sufficient compressive stress by crimping, the frictional force between the conductor 13 and the tensile strength body 17 may be increased. For example, by providing unevenness on the inner surface of the wire crimping portion 7, it is possible to partially increase the compressive stress on the tensile strength body 17 and prevent it from being pulled out.

Further, when the conductor crimping portion 7 has a cylindrical shape and the joint portion has a brazed portion, the brazed portion having a low hardness has a small compressive stress on the conductor 13, so that the tensile strength body 17 is pulled out. It will be easier. Therefore, it is desirable to remove the brazed portion or to make the hardness of the joint portion formed in the conductor crimping portion 7 without the brazing portion equal to the hardness of the material in the conductor crimping portion 7.

Further, by forming the terminal processing portion 19 at the tip of the conductor wire 13, it is possible to prevent the conductor wire 13 from being loosened when the conductor wire 13 is inserted into the conductor wire crimping portion 7.

Further, since the wire crimping portion 7 has the wire holding portion 7a and the conduction portion 7b, the wire holding portion 7a is crimped at a compression rate suitable for ensuring the connection strength, and compression suitable for ensuring continuity. The conductive portion 7b can be crimped at a rate. That is, since the compressibility (compression amount) of each of the wire holding portion 7a and the conductive portion 7b can be made different, each portion can be crimped at a compression rate suitable for the purpose.

More specifically, by using the wire holding portion 7a on the tip end side (terminal body 3 side) of the lead wire crimping portion 7, stronger crimping can be performed and high connection strength can be ensured. At this time, a part of the conducting wire 13 may be broken. On the other hand, since the conductive portion 7b is arranged on the rear end portion side (covered portion 15 side) of the conducting wire crimping portion 7, even if a part of the conducting wire 13 is broken in the wire holding portion 7a, the coated conducting wire 11 and the conductive portion 7b are arranged. Continuity with the terminal 1 can be ensured.

Further, since the crimping work can be performed in the same work as the crimping of a normal electric wire with a terminal, the work is easy. In particular, it can be applied to the coated conductor 11 including the tensile strength body 17, and in this case, even the coated conductor 11 having a small diameter can secure high connection strength.

At this time, since both the tensile strength body 17 and the conducting wire 13 are collectively crimped by the electric wire holding portion 7a, it is not necessary to crimp the tensile strength body 17 and the conducting wire 13 separately, and the crimping work is easy. In the case of the coated conductor 11 including the tensile strength body 17, the tensile strength body 17 is arranged substantially in the center of the cross section and the conductor wire 13 is arranged on the outer periphery thereof so that the terminal 1 and the conductor wire 13 can be securely crimped at the time of crimping. The terminal 1 and the conducting wire 13 can be brought into contact with each other.

(Second embodiment)
Next, the second embodiment will be described. FIG. 9 is a perspective view before the covered conductor 11 of the terminal 1a according to the second embodiment is crimped. In the following description, the same reference numerals as those in FIGS. 1 to 8 will be given to the configurations having the same functions as those of the first embodiment, and duplicate description will be omitted.

The terminal 1a has substantially the same configuration as the terminal 1, but the form of the crimping portion 5 is different. The terminal 1a is different in that the lead wire crimping portion 7 is tubular and the covering crimping portion 9 is an open barrel type. As described above, the covering crimping portion 9 may be an open barrel type instead of a tubular type.

At the terminal 1a, a conductor positioning portion 8 is formed between the coated crimping portion 9 and the conductor crimping portion 7 so that the width gradually narrows toward the conductor crimping portion 7. FIG. 10A is a diagram showing a state in which the conducting wire 13 is arranged on the covering crimping portion 9. At this time, since the coated crimping portion 9 is an open barrel type, the lead wire 13 of the coated conducting wire 11 can be arranged from above the coated crimping portion 9. By arranging the conductor 13 on the covering crimping portion 9, the conductor 13 can be positioned (positioning of the terminal 1a in the width direction).

From this state, as shown in FIG. 10B, by sliding the coated conductor 11 toward the conductor crimping portion 7 of the terminal 1a, the conductor 13 can be easily inserted into the tubular conductor crimping portion 7. In this way, since the conductor 13 can be positioned with respect to the conductor crimping portion 7, even if the inner diameter of the conductor crimping portion 7 before crimping is small (close to the outer diameter of the conductor 13), the conductor 13 can be easily positioned. Can be inserted into the wire crimping part. By doing so, the terminal 1a can be miniaturized.

Further, since the width of the covering portion 15 is larger than that of the conducting wire positioning portion 8, when the conducting wire 13 is slid and inserted into the conducting wire crimping portion 7, the tip of the covering portion 15 abuts on the conducting wire positioning portion 8. Therefore, positioning of the conducting wire 13 in the longitudinal direction is easy. By crimping in this state, an electric wire with a terminal can be obtained.

According to the second embodiment, the same effect as that of the first embodiment can be obtained. Further, since the coated crimping portion 9 is an open barrel type, it is easy to arrange the coated conducting wire 11 on the crimping portion 5. Further, since the coated conductor 9 can be easily positioned with respect to the conductor crimping portion 7, the conductor 13 can be easily inserted into the conductor crimping portion 7 even if the conductor crimping portion 7 is tubular.

When the wire crimping portion 7 is divided into an electric wire holding portion 7a and a conductive portion 7b, the conductive portion 7b may also be an open barrel type, and only the electric wire holding portion 7a may be tubular. As described above, if at least a part of the conductor crimping portion 7 is a tubular shape closed in the circumferential direction, the other portion may be an open barrel type.

A plurality of electric wires with various terminals were prepared, and the positional relationship between the conductor of the obtained electric wire with terminals and the wire crimping portion and the insertion workability were evaluated.

(Example 1)
An electric wire with a terminal was created using the terminal 1a shown in FIG. As the coated conductor wire, an annealed copper wire having a cross-sectional shape as shown in FIG. 3 (b) and having a 1.25 sq / 16 core was used.

(Example 2)
As compared with Example 1, a covered conductor having a cross-sectional shape as shown in FIG. 3A and having an annealed copper wire of 0.3 sq / 7 core was used.

(Example 3)
As compared with Example 1, a covered conductor having a cross-sectional shape as shown in FIG. 3A and having an annealed copper wire of 0.35 sq / 7 core was used.

(Example 4)
As compared with Example 1, a coated conducting wire having a cross-sectional shape as shown in FIG. 3A and having an annealed copper wire of 0.13 sq / 7 core was used.

(Example 5)
With respect to Example 1, as a coated conductor, twelve annealed copper wires having a cross-sectional shape as shown in FIG. 3 (c), having a circular cross section and having the same cross-sectional area are arranged around the tensile strength body to form a conductor. The one in which the total cross-sectional area of the tensile strength body was 0.05 sq was used.

(Example 6)
As shown in FIG. 5 (d), the tip of the coated conductor was collectively formed with a plating layer with respect to Example 5.

(Example 7)
An electric wire with a terminal was created using the terminal 1 shown in FIG. As the coated conductor, twelve annealed copper wires having a cross-sectional shape as shown in FIG. 3C and having a circular cross section and the same cross-sectional area are arranged around the tensile strength body, and the total disconnection of the conductor wire and the tensile strength body is cut. The one having an area of 0.05 sq was used.

(Example 8)
An electric wire with a terminal was created using the terminal 1a shown in FIG. As the coated conductor wire, one having a cross-sectional shape as shown in FIG. 3A and having an annealed copper wire of 0.13 sq / 7 core was used.

(Example 9)
With respect to Example 8, eight annealed copper wires having a cross-sectional shape as shown in FIG. 3 (c), having a circular cross section and having the same cross-sectional area are arranged as the coated conductors, and the conductors and the conductors have a cross-sectional shape as shown in FIG. The one having the total cross-sectional area of the tensile strength body of 0.13 sq was used.

(Example 10)
As compared with Example 8, a covered conductor having a cross-sectional shape as shown in FIG. 3A and having a 0.08 sq / 7-core annealed copper wire was used.

(Example 11)
With respect to Example 8, eight annealed copper wires having a cross-sectional shape as shown in FIG. 3 (c), having a circular cross section and having the same cross-sectional area are arranged as the coated conductors, and the conductors and the conductors have a cross-sectional shape as shown in FIG. The total cross-sectional area of the tensile strength body was 0.08 sq.

(Example 12)
As shown in FIG. 5 (d), the tip of the coated conductor was collectively formed with a plating layer with respect to Example 11.

(Example 13)
An electric wire with a terminal was created using the terminal 1 shown in FIG. As the coated conductor, eight annealed copper wires having a cross-sectional shape as shown in FIG. 3 (c) and having a circular cross section and the same cross-sectional area are arranged around the tensile strength body, and the total disconnection of the conductor wire and the tensile strength body is cut. The one having an area of 0.13 sq was used.

(Example 14)
An electric wire with a terminal was created using the terminal 1 shown in FIG. As the coated conductor, eight annealed copper wires having a cross-sectional shape as shown in FIG. 3 (c) and having a circular cross section and the same cross-sectional area are arranged around the tensile strength body, and the total disconnection of the conductor wire and the tensile strength body is cut. The one having an area of 0.08 sq was used.

(Comparative Example 1)
As the crimping portion, a tubular terminal having a constant inner diameter that does not have a conducting wire positioning portion is used, and as the coated conducting wire, the one having a cross-sectional shape as shown in FIG. 3 (b) and having an annealed copper wire of 1.25 sq / 16 cores. Was used.

(Comparative Example 2)
As compared with Comparative Example 1, a coated conductive wire having a cross-sectional shape as shown in FIG. 3A and having an annealed copper wire of 0.3 sq / 7 core was used.

(Comparative Example 3)
As compared with Comparative Example 1, a coated conductive wire having a cross-sectional shape as shown in FIG. 3A and having an annealed copper wire of 0.13 sq / 7 core was used.

(Comparative Example 4)
Compared to Comparative Example 1, twelve annealed copper wires having a cross-sectional shape as shown in FIG. 3 (c), having a circular cross section and having the same cross-sectional area are arranged as the coated conductors, and the conductors and the conductors have a cross-sectional shape as shown in FIG. The one in which the total cross-sectional area of the tensile strength body was 0.05 sq was used.

(Comparative Example 5)
With respect to Comparative Example 4, as shown in FIG. 5 (d), the tip portion of the coated conductor wire was used in which a plating layer was collectively formed.

In each of Examples 1 to 14, the conductor could be crimped by arranging the conductor at an appropriate position with respect to the conductor crimping portion. On the other hand, in Comparative Examples 1 to 5, it was difficult to align the conductors, and it took time to position them. In addition, the arrangement of the conductors varied widely, and the position of the conductors with respect to the crimped portion of the conductors varied widely.

Although the embodiments of the present invention have been described above with reference to the attached drawings, the technical scope of the present invention does not depend on the above-described embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs to.

For example, in the above description, an example in which one layer of the conducting wire 13 is arranged on the outer periphery of the tensile strength body 17 is shown, but the arrangement of the conducting wire 13 is not limited to this. As long as the conductor 13 is arranged on the outer peripheral side of the tensile strength body 17, the conductor wire 13 may be arranged in two layers around the tensile strength body 17 as shown in FIG. 16 (a). As shown, the conductor 13 may be arranged in three layers around the tensile strength body 17. Further, the number of the conducting wires 13 may be 3 or more in the layer in contact with the tensile strength body 17 from the viewpoint of the conductivity and strength of the conducting wires 13 itself, and is preferably 20 or less. For example, as shown in FIGS. 5, 6, 11, 11 and the like, 12 or 14 lines may be used, or 6 lines or 8 lines may be used.

1, 1a ………… Terminal 3 ………… Terminal body 4 ………… Transition part 5 ………… Crimping part 7 ………… Conductor crimping part 7a ………… Wire holding part 7b ………… Conduction part 8 ………… Conductor Positioning part 9 ………… Covered crimping part 10 …… Wire with terminal 11 ………… Covered conductor 13 ………… Conductor 15 ………… Covered part 17 ………… Tensile body 19 ………… Terminal processing part 21 ………… Plating Layer 31a ………… Upper blade type 31b ………… Lower blade type 32a, 32b ………… Conductor crimping blade type 34 ………… Covered crimping blade type

Claims (10)

An electric wire with a terminal that electrically connects the coated conductor and the terminal.
The terminal includes a wire crimping portion where a conductor exposed from a coated portion at the tip of the coated conductor is crimped, and a coated crimping portion where the coated portion of the coated conductor is crimped.
At least a part of the wire crimping portion is a tubular shape closed in the circumferential direction.
At least a part between the conductor crimping portion and the covering crimping portion, a conductor positioning portion whose size decreases toward the tip side is formed.
An electric wire with a terminal, characterized in that, in the conductor positioning portion, the tip of the covering portion comes into contact with the conductor, and the insertion allowance of the conductor wire into the conductor crimping portion is restricted. The electric wire with a terminal according to claim 1, wherein the coated conductor is composed of a plurality of the conductors and at least one tensile strength body. The second aspect of claim 2, wherein the tensile strength body is located substantially at the center of the coated lead wire and the lead wire is arranged on the outer peripheral portion of the tensile strength body in a cross section perpendicular to the longitudinal direction of the coated lead wire. Electric wire with terminals. The electric wire with a terminal according to claim 3, wherein the conductor is twisted in the longitudinal direction of the coated conductor. 7. Wire with terminal. The invention according to any one of claims 1 to 5, wherein the conductor has a cross-sectional area of 0.35 sq or less, and the terminal can crimp the conductor having a cross-sectional area of 0.35 sq or less. Electric wire with terminals. The invention according to any one of claims 1 to 6, wherein the conductor has a cross-sectional area of 0.3 sq or less, and the terminal can crimp the conductor having a cross-sectional area of 0.3 sq or less. Electric wire with terminals. A wire harness including a terminal-attached electric wire according to any one of claims 1 to 7, wherein a plurality of terminal-attached electric wires are integrated. A terminal that is electrically connected to a covered conductor
It is provided with a wire crimping portion where a conductor exposed from a covering portion at the tip of the coated conductor is crimped, and a coated crimping portion where the covering portion of the coated conductor is crimped.
The wire crimping portion is a tubular shape that is closed in the circumferential direction.
A terminal characterized in that, at least a part between the conductor crimping portion and the covering crimping portion, a conductor positioning portion whose size decreases toward the tip side is formed. The method for manufacturing an electric wire with a terminal according to any one of claims 1 to 7.
Before crimping, the size of the conductor positioning portion is larger than the inner diameter of the covering portion and smaller than the outer diameter of the covering portion.
A method for manufacturing an electric wire with a terminal, which comprises inserting the tip of the coated conductor until the tip of the coated portion comes into contact with the conductor positioning portion, and crimping the conductor crimping portion.

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