JP2023009714A - Electric wire, electric wire with terminal, and method for manufacturing electric wire - Google Patents

Abstract

To provide an electric wire in which resistance in conductor is reduced.SOLUTION: The electric wire 3 includes a conductive conductor 31 formed by twisting a plurality of strands 32, and an insulating covering member 33 covering the conductor 31. The strand 32 has an outer peripheral surface forming strand 32a forming the conductor outer peripheral surface 31o of the conductor 31, and a non-outer peripheral surface forming strand 32b not forming the conductor outer peripheral surface 31o. At least on the strand outer peripheral surface 32o of the non-peripheral surface forming strand 32b, a plurality of linear convexoconcaves 32e extending crossing the extending direction L of each non-peripheral surface forming strand 32b are formed.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to an electric wire, an electric wire with a terminal, and a method for manufacturing an electric wire.

Some electric wires have a conductive conductor formed by twisting a plurality of wires and a covering member covering the conductor. Some electric wires use aluminum as a conductor material.

However, when the conductors are formed using aluminum as a material, an oxide film is formed on the conductor outer peripheral surface of each conductor, which increases the electric resistance of the conductor. In order to solve this problem, in conventional electric wires with terminals, serrations formed by concave portions and convex portions are provided on the surface of the metal terminal that contacts the conductor, and when the metal terminal is crimped to the end of the electric wire, There is a technique for electrically connecting a conductor and a metal terminal by destroying an oxide film formed on the outer peripheral surface of the conductor by the serrations (see, for example, Patent Document 1).

JP-A-2003-249284

However, among the plurality of strands, if there is a non-peripheral surface forming strand that does not contact the metal terminal and does not form the conductor outer peripheral surface inside the outer peripheral surface forming strand that forms the conductor outer peripheral surface of the conductor, The serrations provided on the metal terminal cannot destroy the oxide film of the non-peripheral surface forming strands. Therefore, it has been required to reduce the electric resistance of the conductor in the electric wire having the non-peripheral surface formed strands.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electric wire, a terminal-equipped electric wire, and a method for manufacturing an electric wire, which can reduce the electric resistance of the conductor.

In order to solve the above problems, an electric wire according to the present invention includes a conductive conductor formed by twisting a plurality of strands, and an insulating covering member covering the conductor, and a plurality of the above The strand has an outer peripheral surface forming strand that forms the conductor outer peripheral surface of the conductor and a non-outer peripheral surface forming strand that does not form the conductor outer peripheral surface, and at least the strand in the non-outer peripheral surface forming strand The outer peripheral surface is characterized in that a plurality of linear irregularities extending crosswise with respect to the extending directions of the non-peripheral surface forming strands are formed.

In order to solve the above problems, a method for manufacturing an electric wire according to the present invention provides an electric wire including a conductive conductor formed by twisting a plurality of strands, and an insulating covering member covering the conductor. a wire forming step of extending a conductive columnar metal material along an extending direction and compressing it in a direction orthogonal to the extending direction to form a wire; Among the plurality of strands, at least a non-peripheral surface-forming element wire that does not form a conductor outer peripheral surface of the conductor extends to the outer peripheral surface of the strand, intersecting with the extending direction of the non-peripheral surface-forming strand. an unevenness forming step of forming a plurality of existing linear unevenness, a conductor forming step of twisting the plurality of strands to form the conductor, and a covering step of covering the conductor with the covering member; The unevenness forming step is formed on a roller outer peripheral surface of a roller that feeds each of the wires from each of the wire forming steps to the conductor forming step, protrudes radially outward from the roller outer peripheral surface, and extends in the circumferential direction of the roller. It is characterized in that the irregularities are formed on the outer peripheral surface of the wire by transferring the blade portions arranged at intervals.

Since the electric wire, the electric wire with a terminal, and the method for manufacturing the electric wire according to the present embodiment have the above configuration, the electrical resistance of the conductor can be reduced.

FIG. 1 is a perspective view of an electric wire with a terminal according to this embodiment. FIG. 2 is a plan view of an exposed electric wire in which a covering member is removed from the end of the electric wire to expose the conductor of the end. FIG. 3 is a front view of an exposed electric wire. FIG. 4 is a cross-sectional view of the wire along the extending direction of the wire. FIG. 5 is an explanatory diagram showing an outline of the electric wire manufacturing method according to the present embodiment. FIG. 6 is a perspective view showing rollers of an unevenness forming device used in the electric wire manufacturing method according to the present embodiment. 7 is an enlarged view in the direction of arrow B in FIG. 6. FIG. FIG. 8 is a perspective view of a wire according to this embodiment. 9 is an enlarged view in the direction of arrow C of FIG. 8. FIG. FIG. 10 is a perspective view showing a terminal crimping device according to this embodiment. FIG. 11 is a front view showing a terminal crimping device according to this embodiment. 12 is a cross-sectional view taken along line DD in FIG. 11. FIG. FIG. 13 is a cross-sectional view showing a state where the second mold in the terminal crimping device is at the bottom dead center. 14 is a cross-sectional view taken along line EE of FIG. 13. FIG. FIG. 15 is a perspective view showing a concavo-convex forming apparatus used in the concavo-convex forming process according to the second embodiment. FIG. 16 is a perspective view showing a concavo-convex forming apparatus used in the concavo-convex forming process according to the third embodiment. FIG. 17 is a perspective view showing a concavo-convex forming apparatus used in the concavo-convex forming process according to the second embodiment. FIG. 18 is a perspective view showing a roller provided in an unevenness forming apparatus used in the unevenness forming step according to the first reference example. FIG. 19 is a perspective view showing rollers provided in an unevenness forming apparatus used in the unevenness forming step according to the second reference example. FIG. 20 is a perspective view showing rollers provided in an unevenness forming apparatus used in the unevenness forming step according to the third reference example. FIG. 21 is a cross-sectional view orthogonal to the first direction, which is the extending direction of the wire, in the electric wire according to the first modification of the first embodiment. FIG. 22 is a cross-sectional view orthogonal to the first direction, which is the extending direction of the wire, in the electric wire according to the first modification of the first embodiment. FIG. 23 is a cross-sectional view orthogonal to the first direction, which is the extending direction of the wire, in the electric wire according to the first modification of the first embodiment.

EMBODIMENT OF THE INVENTION Below, embodiment of the electric wire which concerns on this invention, an electric wire with a terminal, and the manufacturing method of an electric wire is described based on drawing. In addition, this invention is not limited by this embodiment. In addition, components in the following embodiments include those that can be easily assumed by those skilled in the art or substantially the same components.

[First embodiment]
FIG. 1 is a perspective view of an electric wire 1 with a terminal according to this embodiment. FIG. 2 is a plan view of the wire 3 in an exposed state in which the covering member 33 of the end of the wire 3 is removed to expose the conductor 31 of the end. FIG. 3 is a front view of the electric wire 3 in an exposed state. FIG. 4 is a cross-sectional view of the wire 32 along the first direction L, which is the extending direction of the wire 32 .

In the following description, the extending direction of the wire 32 will be referred to as "first direction L". A direction orthogonal to the first direction L is called a "second direction W". The second direction W is the width direction of the metal terminal 2 . A direction orthogonal to the first direction L and the second direction W is called a "third direction H". The third direction H is the height direction of the metal terminals 2 . In the first direction L, the tip side of the conductor 31 is called "front side", and the side opposite to the front side is called "rear side".

As shown in FIG. 1 , a terminal-equipped wire 1 according to this embodiment has a metal terminal 2 and a wire 3 . The metal terminal 2 is a terminal that is crimped onto the electric wire 3 . The metal terminal 2 is electrically connected to a mating terminal (not shown) while being integrated with the electric wire 3 . The electric wire 3 includes a conductive conductor 31 and an insulating covering member 33 . A conductor 31 is exposed for a predetermined length by removing the covering member 33 at the end of the electric wire 3 .

The conductor 31 of this embodiment is formed by twisting a plurality of strands 32 . Each strand 32 is made of a conductive metal such as aluminum or an aluminum alloy. In this embodiment, as shown in FIG. 4, the cross-sectional shape of the conductor 31 viewed from the first direction L, which is the extending direction of the wire 32, is circular.

As shown in FIG. 3, the wire 32 according to the present embodiment has an outer peripheral surface forming wire 32a and a non-peripheral surface forming wire 32b. Among the plurality of wires 32 , the outer peripheral surface forming wire 32 a is the wire 32 that forms the conductor outer peripheral surface 31 o of the conductor 31 . When viewed from the first direction L, which is the extending direction of the conductor 31, the outer peripheral surface forming strand 32a is arranged radially outward and exposed to the outer surface.

Among the plurality of strands 32 , non-peripheral surface forming strands 32 b are strands 32 that do not form the conductor outer peripheral surface 31 o of the conductor 31 . When viewed from the first direction L, which is the direction in which the conductor 31 extends, the non-peripheral surface forming strands 32b are arranged radially inward and are not exposed to the outer surface.

Each strand 32 has a strand main body 32c on the inner side in the radial direction. In addition, a wire outer peripheral surface 32o of each wire 32 is covered with an oxide film 32d as shown in FIG. The oxide film 32d is made of, for example, insulating aluminum oxide and has a radial thickness of approximately 5 to 10 nm.

A plurality of linear irregularities 32e are formed on the wire outer peripheral surface 32o of each wire 32 so as to cross the first direction L, which is the direction in which the wire 32 extends. The unevenness 32e is formed by a concave portion 32e1 and a convex portion 32e2. The concave portion 32e1 is recessed radially inward of the wire 32 from the wire outer peripheral surface 32o, and is formed in a linear shape extending across the first direction L, which is the extending direction of the wire 32. As shown in FIG. The convex portion 32e2 protrudes radially outward of the wire 32 from the wire outer peripheral surface 32o, and is formed in a linear shape extending crossing the first direction L, which is the extending direction of the wire 32. .

The metal terminal 2 is crimped onto the end of the electric wire 3 to be electrically connected to the exposed conductor 31 . The metal terminal 2 is formed from a conductive metal plate (for example, a copper plate, a copper alloy plate, an aluminum plate, or an aluminum alloy plate) as a base material. The metal terminal 2 is formed into a predetermined shape that can be connected to the mating terminal or the electric wire 3 by punching or bending a base material. The metal terminal 2 has a terminal connection portion (not shown), a first connecting portion 11 , a conductor crimping portion 12 , a second connecting portion 13 , and a covering crimping portion 14 . The first connecting portion 11, the conductor crimping portion 12, the second connecting portion 13, and the covering crimping portion 14 are arranged along the first direction L in this order.

A terminal connection portion (not shown) is a portion of the metal terminal 2 that is connected to the mating terminal, and is arranged on the frontmost side of the metal terminal 2 . The first connecting portion 11 electrically connects the terminal connecting portion and the conductor crimping portion 12 . The conductor crimping portion 12 is crimped onto the conductor 31 of the electric wire 3 . The covering crimp portion 14 is crimped onto the covering member 33 of the electric wire 3 . The conductor crimping portion 12 and the covering crimping portion 14 are connected via the second connecting portion 13 . The first connecting portion 11 extends forward from the conductor crimping portion 12 . The conductor crimping portion 12 includes a first bottom portion 15 positioned at the center in the second direction W, and a pair of first crimping portions that are bent from the end portion of the first bottom portion 15 in the second direction W so that the tips come into contact with each other. It has strips 16a, 16b. The covering crimping portion 14 includes a second bottom portion 17 positioned in the center in the second direction W, and a pair of second caulking portions that are bent from the ends of the second bottom portion 17 in the second direction W so that the tips come into contact with each other. It has strips 18a, 18b.

Next, a method for manufacturing the electric wire 3 according to this embodiment will be described with reference to FIG. The method for manufacturing the electric wire 3 according to the present embodiment includes a wire forming step, an unevenness forming step, a conductor forming step, and a covering step.

The wire forming step is a step of extending the conductive columnar metal material 30 along the first direction L, which is the extending direction, and compressing it in a direction orthogonal to the extending direction to form a wire. is. The wire forming process includes, for example, a first wire drawing process, a second wire drawing process, and a third wire drawing process. In the first wire drawing step, for example, a columnar metal material 30 made of an aluminum alloy or the like is heated to a predetermined annealing temperature, and the metal material 30 is heated to a first through hole 41 h formed in the first die 41 . pass through By passing the cylindrical metal material 30 through the first through hole 41h, the metal material 30 is stretched in the first direction L and compressed in a direction orthogonal to the first direction L. As shown in FIG.

The second wire drawing step uses a second die 42 having a second through hole 42h with a diameter smaller than that of the first through hole 41h. More specifically, the metal material 30 is passed through a second through hole 42h formed in the second die 42. As shown in FIG. By passing the cylindrical metal material 30 through the second through hole 42h, the metal material 30 is stretched in the first direction L and compressed in a direction orthogonal to the first direction L. As shown in FIG.

The third wire drawing step uses a third die 43 having a third through hole 43h with a diameter smaller than that of the second through hole 42h. More specifically, the metal material 30 is passed through the third through hole 43 h formed in the third die 43 . By passing the columnar metal material 30 through the third through hole 43h, the metal material 30 is stretched in the first direction L and compressed in a direction perpendicular to the first direction L so that the wires 32 is formed.

The unevenness forming step is a step of forming a plurality of linear unevennesses 32e extending across the first direction L of the wire 32 on the wire outer peripheral surface 32o. The unevenness forming process according to the present embodiment is performed by the unevenness forming device 5 . The unevenness forming apparatus 5 according to this embodiment includes four rollers 51 for feeding each wire 32 from each wire forming process to a conductor forming process. The four rollers 51 are spaced apart from each other along the feeding direction of the wire 32 . 5 shows only two rollers 51 out of the four rollers 51, and the other two rollers 51 are omitted.

Each roller 51 is provided rotatably about a rotating shaft 51x in a rotation direction R1 with respect to a housing (not shown) of the unevenness forming device 5 shown in FIG. Each roller 51 has a plurality of blade portions 51a protruding radially outward from each roller outer peripheral surface 51o and arranged at intervals in the circumferential direction of the roller 51 . Each blade portion 51 a extends continuously along the width direction parallel to the rotation axis 51 x of the roller 51 . In the unevenness forming step, each blade portion 51a of the unevenness forming device 5 is transferred to the wire 32, thereby forming unevenness 32e on the wire outer peripheral surface 32o.

A roller outer peripheral surface 51o of each roller 51 shown in FIGS. 6 and 7 has a center 51m in the width direction parallel to the rotation shaft 51x that is recessed radially inward, and both sides 51s1 and 51s2 in the width direction are centered in the width direction. Projects to 51m. Further, the roller outer peripheral surface 51o of each roller 51 has blade portions 51a provided at predetermined intervals along the rotation direction R1 of the roller 51. As shown in FIG. The blade portion 51a protrudes radially outward from the roller outer peripheral surface 51o. As the wire outer peripheral surface 32o is pressed against the blade portion 51a of the roller outer peripheral surface 51o, the unevenness 32e is formed in a part of the wire outer peripheral surface 32o. More specifically, the blade portion 51a on the roller outer peripheral surface 51o is pressed, and the portion where the wire outer peripheral surface 32o is shaved becomes the concave portion 32e1. The portion positioned between the two is pressed, and the portion where the wire outer peripheral surface 32o is not shaved becomes the convex portion 32e2 to form the unevenness 32e. That is, the unevenness forming step is formed on the roller outer peripheral surface 51o of the roller 51 that feeds each wire 32 from each wire forming step to the conductor forming step, protrudes radially outward from the roller outer peripheral surface 51o, and extends around the roller 51. The unevenness 32e is formed on the wire outer peripheral surface 32o by transferring the blade portions 51a that are spaced apart in the direction.

In the concave-convex forming step according to the present embodiment, four rollers 51 are used to form concave portions 32e1 on the wire outer peripheral surface 32o. More specifically, one of the four rollers 51 forms the unevenness 32e in the lower part of the wire 32, one roller 51 forms the unevenness 32e in the upper part of the wire 32, and one roller 51 forms the unevenness 32e above the wire 32. 51 forms unevenness 32 e on one side of the wire 32 , and one roller 51 forms unevenness 32 e on the other side of the wire 32 .

8 and 9, the wire 32 according to the present embodiment is formed into a linear shape extending crossing the first direction L, which is the extending direction of the wire 32, as shown in FIGS. The unevenness 32e is formed over the entire circumference of the wire outer peripheral surface 32o. The unevenness 32e according to the present embodiment is orthogonal to the first direction L, which is the extending direction. The concave portion 32e1 and the convex portion 32e2 that form the unevenness 32e are formed in an annular shape that is continuous along the circumferential direction of the wire 32 with respect to the wire outer peripheral surface 32o.

The conductor forming step is a step of twisting a plurality of strands 32 to form the conductor 31 . In the conductor forming step, the conductor 31 is formed by consolidating the plurality of strands 32 in the converging direction R3 while twisting the plurality of strands 32 in the circumferential direction R2. That is, in the conductor forming step, the conductor 31 is formed by twisting the plurality of strands 32 .

The covering step is a step of covering the conductor 31 with the covering member 33 . More specifically, in the covering step, the conductor 31 is covered with the covering member 33 by injection-molding the insulating covering member (for example, vinyl chloride) 33 onto the conductor outer peripheral surface 31 o of the conductor 31 .

Next, a method for manufacturing the terminal-attached electric wire 1 according to this embodiment will be described. The manufacturing method of the electric wire 1 with a terminal according to the present embodiment includes a removal process, an installation process, and a crimping process.

The removal step is a step of removing a portion of the covering member 33 from the electric wire 3 to expose the conductor 31 . As shown in FIG. 3 , in the removing step, the end portion 33 a of the covering member 33 in the first direction L is removed from the wire 3 . By removing the end portion 33 a of the covering member 33 , the conductor exposed portion 31 a of the conductor 31 is exposed from the covering member 33 . In other words, the electric wire 3 has a conductor exposed portion 31 a that exposes the conductor 31 to the outside from the covering member 33 at the end of the electric wire 3 .

The installation process is a process of installing the metal terminal 2 and the electric wire 3 . In the installation process, as shown in FIGS. 11 and 12, a terminal crimping device 100 having a first mold 110 and a second mold 120 is used, and the metal terminal 2 is attached to the first mold 110 of the terminal crimping device 100. and electric wire 3 are installed. The first mold 110 is a fixed mold and supports the metal terminal 2 and the electric wire 3 . The second mold 120 is a movable mold, and is configured to be vertically movable relative to the first mold 110 .

The first mold 110 has a first anvil 111, a second anvil 112, and a third anvil 113, as shown in FIG. The first anvil 111 supports the conductor crimping portion 12 of the metal terminal 2 . A second anvil 112 supports the covering crimp 14 . The third anvil 113 supports the first connecting portion 11 and a terminal connecting portion (not shown).

A second mold 120 has a first crimper 121 and a second crimper 122 . The first crimper 121 faces the first anvil 111 . In the crimping step, the first crimper 121 crimps the conductor crimping portion 12 to crimp the conductor crimping portion 12 to the conductor 31 . The second crimper 122 faces the second anvil 112 . The second crimper 122 crimps the covering crimping portion 14 to crimp the covering crimping portion 14 to the covering member 33 in the crimping step.

In the installation step, the metal terminal 2 is placed on the upper surface of the first mold 110 . As shown in FIGS. 11 and 12, the conductor crimping portion 12 of the metal terminal 2 has a first bottom portion 15 and a pair of first crimping pieces 16a and 16b, and is formed in a U shape. The first bottom portion 15 is a portion that becomes a bottom wall of the conductor crimping portion 12 formed in a U-shape. The pair of first crimping pieces 16a and 16b are portions facing each other in the second direction W in the U-shaped conductor crimping portion 12 . The first crimping piece 16a extends from one end of the first bottom portion 15 in the second direction W, and the first crimping piece 16b extends from the other end of the first bottom portion 15 in the second direction W. As shown in FIG.

The covering crimping portion 14 has a second bottom portion 17 and a pair of second crimping pieces 18a and 18b, and is formed in a U shape. The second bottom portion 17 is a portion that serves as a bottom wall of the covering pressure-bonding portion 14 formed in a U-shape. The pair of second crimping pieces 18a and 18b are portions facing each other in the second direction W in the covering crimping portion 14 formed in a U shape. The second crimping piece 18a extends from one end of the second bottom portion 17 in the second direction W, and the second crimping piece 18b extends from the other end of the second bottom portion 17 in the second direction W. The covering crimping portion 14 is formed apart from the conductor crimping portion 12 when viewed from the first direction L. As shown in FIG.

The metal terminal 2, as shown in FIG. It is placed on one mold 110 . The metal terminal 2 is placed so that the first bottom portion 15 is supported by the first anvil 111 and the tips of the pair of first crimping pieces 16 a and 16 b face the first crimper 121 .

The electric wire 3 is installed on the metal terminal 2 supported by the first mold 110 . The electric wire 3 is installed on the metal terminal 2 so that the exposed conductor portion 31a of the conductor 31 faces the first bottom portion 15 of the conductor crimping portion 12, and the covering member 33 faces the second bottom portion 17 of the covering crimping portion 14. . In other words, the electric wire 3 is installed in the space surrounded by the first bottom portion 15 and the pair of first crimping pieces 16a and 16b in the metal terminal 2, and the second bottom portion 17 and the pair of second crimping pieces It is installed in the space surrounded by 18a and 18b.

The crimping step is a step of crimping the conductor crimping portion 12 to the conductor 31 . In this embodiment, in the crimping process, the conductor crimping portion 12 and the covering crimping portion 14 are crimped to the conductor 31 and the covering member 33, respectively. In the crimping process, the metal terminal 2 and the electric wire 3 are sandwiched between the first mold 110 and the second mold 120 . The first mold 110 and the second mold 120 press the first clamping pieces 16 a and 16 b against the conductor 31 and press the second clamping pieces 18 a and 18 b against the covering member 33 . In the crimping step, as shown in FIGS. 13 and 14 , the second mold 120 is moved downward in the vertical direction with respect to the first mold 110 . The second mold 120 contacts the metal terminal 2 while moving downward. Specifically, the first crimper 121 contacts the tips 16d of the first crimping pieces 16a and 16b.

The first crimper 121 has a pair of curved surfaces 121a, 121b that deform the pair of first crimping pieces 16a, 16b. The curved surfaces 121a, 12b deform the tips 16d of the pair of first crimping pieces 16a, 16b so as to approach each other. Also, in other words, the first crimper 121 deforms the pair of first crimping pieces 16a, 16b so that the conductor 31 is wrapped by the pair of first crimping pieces 16a, 16b and the first bottom portion 15 . FIG. 13 shows the state when the second mold 120 is at the bottom dead center in the crimping process.

The first crimper 121 of this embodiment, as shown in FIG. 13, performs so-called B crimping. The pair of first crimping pieces 16a and 16b are each curved in a cross section perpendicular to the first direction L of the wire 32 so that the conductor crimping portion 12 has a B-shaped cross section. Tip ends 16 d of the pair of first crimping pieces 16 a and 16 b face downward and are pressed against the conductor 31 . A pair of first crimping pieces 16 a and 16 b press the conductor 31 toward the first bottom portion 15 . The first crimping pieces 16 a and 16 b wrap the conductor 31 and compress the conductor 31 . The second crimping pieces 18a and 18b of the covering crimping portion 14 are deformed in the same manner as the first crimping pieces 16a and 16b and crimped to the covering member 33. As shown in FIG.

Then, in the crimping step, when the first crimping pieces 16a and 16b are crimped onto the conductor 31 by the first mold 110 and the second mold 120, each strand 32 is extended from the strand 32. It is compressed in a direction orthogonal to the first direction L, which is a direction. At this time, the plurality of strands 32 have a number of places where the oxide films 32d of each other are destroyed by the linear unevenness 32e formed on the outer peripheral surface 32o of the strands, and the places where the oxide films 32d are destroyed , there are formed many places where the wires 32 (more specifically, the wires main bodies 32c) that are adjacent in the radial direction are electrically connected without the oxide film 32d interposed therebetween.

Then, the electric resistance of the conductor 31 in the electric wire 3 is reduced for the following reasons. For example, in two strands of wire 32 adjacent to each other, the downward movement of the second mold 120 causes the convex portion 32e2 on one side and the convex portion 32e2 on the other side to come into contact with each other, and then the convex portion 32e2 on the one side By being compressed by the other protrusion 32e2, the oxide films 32d are destroyed and the wire main body 32c is exposed to the outside. After the wire main body 32c is exposed, the second metal mold 120 moves downward to compress the one wire 32 to the other wire 32, thereby are in contact with and electrically connected to the wire body 32c. Such an electrical connection between the wire main bodies 32c is similarly generated between the recesses 32e1 on one side and the recesses 32e1 on the other side in the two adjacent wires 32 . Moreover, such an electrical connection between the wire main bodies 32c is similarly generated between the concave portion 32e1 on one side and the convex portion 32e2 on the other side in the two neighboring wires 32, and The same occurs with the recess 32e1.

In the plurality of wires 32, the electrical connection between the wires 32 as described above occurs between the outer peripheral surface forming wires 32a and between the non-outer peripheral surface forming wires 32b. It occurs in the wire 32a and the non-peripheral surface forming wire 32b. As a result, the plurality of wire strands 32 forming the conductor 31 are electrically connected to each other and the electrical resistance is reduced.

The electric wire 3 according to this embodiment has the following configuration. A plurality of linear unevennesses 32e extending across the first direction L of each wire 32 are formed on at least the wire outer peripheral surface 32o of the non-outer peripheral surface forming wire 32b. Therefore, in the electric wire 3 according to the present embodiment, when the metal terminal 2 is crimped to the end of the electric wire 3, the oxide film 32d located on the outer peripheral surface 32o of each element wire is broken by the linear unevenness 32e, and the conductor of the electric wire 3 is broken. The electrical resistance at 31 can be reduced.

The electric wire 1 with a terminal according to this embodiment has the following configuration. The wire 32 in the exposed conductor portion 31a is compressed in a direction orthogonal to the first direction L of the wire 32 in the crimping step of crimping the end of the electric wire 3 to the metal terminal 2 . Therefore, the plurality of wires 32 that are in contact with each other in the radial direction of the wires 32 have many places where the oxide films 32d of each other are destroyed by the linear unevenness 32e. A large number of locations are formed in which the strands of wire 32 that are adjacent in the radial direction are electrically connected to each other without the coating 32d interposed therebetween. As a result, the terminal-equipped electric wire 1 according to the present embodiment is compared with an electric wire having a conductor formed by twisting a plurality of strands 32 in which linear unevenness 32e is not formed on each strand outer peripheral surface 32o. 31 can be reduced.

The method for manufacturing the electric wire 3 according to this embodiment has the following configuration. In the unevenness forming step, among the plurality of wires 32, at least the non-outer peripheral surface forming strands 32b that do not form the conductor outer peripheral surface 31o of the conductor 31 are extended to the wire outer peripheral surface 32o. A plurality of linear unevennesses 32e are formed to extend crossing the first direction L, which is the direction. The unevenness forming step is formed on the roller outer peripheral surface 51o of the roller 51 that feeds each wire 32 from each wire forming step to the conductor forming step, protrudes radially outward from the roller outer peripheral surface 51o, and extends in the circumferential direction of the roller 51. The unevenness 32e is formed on the wire outer peripheral surface 32o by transferring the blade portions 51a arranged at intervals. Therefore, in the electric wire 3 manufactured by the manufacturing method of the electric wire 3 according to the present embodiment, when the metal terminal 2 is crimped to the end of the electric wire 3, the oxide film 32d of each element wire 32 is destroyed by the linear unevenness 32e. can reduce the electrical resistance in the conductor 31 of the electric wire 3.

[Second embodiment]
Next, an unevenness forming apparatus 5A according to a second embodiment will be described. FIG. 15 is a perspective view showing a concavo-convex forming apparatus 5A used in the concavo-convex forming process according to the second embodiment. The ruggedness forming device 5 used in the ruggedness forming process according to the first embodiment has four rollers 51 spaced apart from each other along the feeding direction of the wire 32 . On the other hand, the unevenness forming apparatus 5A used in the unevenness forming process according to the second embodiment differs in that it has a pair of rollers 51A that sandwich the wire 32 in the middle of the feeding direction in which the wire 32 is fed.

Each roller 51A is rotatably provided around a rotation axis 51x with respect to a housing (not shown). The pair of rollers 51A are arranged such that the outer peripheral surfaces 51o of the rollers face each other in the vertical direction.

Each roller 51A has a plurality of blade portions 51a protruding radially outward from each roller outer peripheral surface 51o and arranged at intervals in the circumferential direction of the roller 51A. Each blade portion 51a extends continuously along the width direction parallel to the rotation axis 51x of the roller 51A. In the unevenness forming step, each blade portion 51a of the unevenness forming device 5A is transferred to the wire 32, thereby forming the unevenness 32e on the wire outer peripheral surface 32o.

According to the method for manufacturing the electric wire 3 according to the second embodiment, the linear unevenness 32e extending crossing the first direction L, which is the extending direction of the wire 32, is formed on the outer peripheral surface 32o of the wire. formed in the part. More specifically, linear unevenness 32e is formed so as to face upper and lower portions of wire outer peripheral surface 32o in the vertical direction. On the other hand, according to the method for manufacturing the electric wire 3 according to the second embodiment, the linear unevenness 32e extending crossing the first direction L, which is the extending direction of the wire 32, is formed on the wire outer peripheral surface 32o. is formed over the entire circumference of the

According to the method for manufacturing the electric wire 3 according to the second embodiment, the number of rollers 51A can be reduced compared to the method for manufacturing the electric wire 3 according to the first embodiment. can be simplified.

[Third Embodiment]
Next, a concavo-convex forming apparatus 5B according to a third embodiment will be described. FIG. 16 is a perspective view showing a concavo-convex forming device 5B used in the concavo-convex forming process according to the third embodiment. The ruggedness forming device 5 used in the ruggedness forming process according to the first embodiment has four rollers 51 spaced apart from each other along the feeding direction of the wire 32 . On the other hand, the unevenness forming device 5B used in the unevenness forming process according to the third embodiment is different in that it has a pair of rollers 51B that sandwich the wire 32 in the middle of the feeding direction of the wire 32 .

Each roller 51B is provided rotatably around a rotation axis 51x with respect to a housing (not shown). The pair of rollers 51B are arranged such that the outer peripheral surfaces 51o of the rollers face each other in the vertical direction.

Each roller 51B has a plurality of blade portions 51a protruding radially outward from each roller outer peripheral surface 51o and arranged at intervals in the circumferential direction of the roller 51B. Each blade portion 51a extends continuously along the width direction parallel to the rotation axis 51x of the roller 51B. In the unevenness forming step, each blade portion 51a of the unevenness forming device 5B is transferred to the wire 32, thereby forming unevenness 32e on the wire outer peripheral surface 32o.

According to the method for manufacturing the electric wire 3 according to the third embodiment, the linear unevenness 32e extending crossing the first direction L, which is the extending direction of the wire 32, is formed on the outer peripheral surface 32o of the wire. formed in the part. More specifically, the linear unevenness 32e is formed so as to face both sides of the wire outer peripheral surface 32o in the left-right direction perpendicular to the up-down direction. On the other hand, according to the method for manufacturing the electric wire 3 according to the first embodiment, the linear unevenness 32e extending crossing the first direction L, which is the extending direction of the wire 32, is formed on the wire outer peripheral surface 32o. is formed over the entire circumference of the

According to the method for manufacturing the electric wire 3 according to the third embodiment, the number of rollers 51B can be reduced compared to the method for manufacturing the electric wire 3 according to the first embodiment. can be simplified.

[Fourth Embodiment]
Next, an unevenness forming apparatus 5C according to a fourth embodiment will be described. FIG. 17 is a perspective view showing a concavo-convex forming apparatus 5C used in the concavo-convex forming process according to the fourth embodiment. The ruggedness forming device 5 used in the ruggedness forming process according to the first embodiment has four rollers 51 spaced apart from each other along the feeding direction of the wire 32 . On the other hand, the unevenness forming apparatus 5C used in the unevenness forming process according to the fourth embodiment has two pairs of rollers 51C provided to sandwich the wire 32 in the middle of the feeding direction in which the wire 32 is fed. different.

Each roller 51C is provided rotatably around a rotation axis 51x with respect to a housing (not shown). One of the two sets of rollers 51C is arranged such that the outer peripheral surfaces 51o of the rollers face each other in the vertical direction. Further, the other roller 51C of the two sets is arranged such that the outer peripheral surfaces 51o of the rollers face each other in the left-right direction perpendicular to the up-down direction.

Each roller 51C has a plurality of blade portions 51a protruding radially outward from each roller outer peripheral surface 51o and arranged at intervals in the circumferential direction of the roller 51C. Each blade portion 51a extends continuously along the width direction parallel to the rotation axis 51x of the roller 51A. In the unevenness forming step, each blade portion 51a of the unevenness forming device 5C is transferred to the wire 32, thereby forming unevenness 32e on the wire outer peripheral surface 32o.

According to the method for manufacturing the electric wire 3 according to the fourth embodiment, the linear unevenness 32e extending crossing the first direction L, which is the extending direction of the wire 32, is formed on the upper and lower surfaces of the wire outer peripheral surface 32o. It is formed so as to face upper and lower parts in the direction and to face both sides in the left-right direction orthogonal to the up-down direction. That is, the concave portions 32e1 and the convex portions 32e2 that form the unevenness 32e in the electric wire 3 manufactured by the method for manufacturing the electric wire 3 according to the fourth embodiment are arranged along the circumferential direction of the wire 32 with respect to the outer peripheral surface 32o of the wire. It is formed in a discontinuous ring.

[First reference example]
Next, the roller 51D provided in the unevenness forming device 5D according to the first reference example will be described. FIG. 18 is a perspective view showing a roller 51D provided in an unevenness forming device 5D used in the unevenness forming step according to the first reference example.

The blade portion 51a of the roller 51 in the unevenness forming device 5 used in the unevenness forming process according to the first embodiment extends continuously along the width direction parallel to the rotation axis 51x of the roller 51 . On the other hand, the plurality of blade portions 51d in the roller 51D provided in the unevenness forming device 5D according to the first reference example are arranged at intervals along the circumferential direction and arranged at intervals along the width direction. .

Each blade portion 51d is formed in a rhombus shape when viewed from the radially outer side. Each blade portion 51a protrudes radially outward from each roller outer peripheral surface 51o.

[Second Reference Example]
Next, the roller 51E provided in the unevenness forming device 5E according to the second reference example will be described. FIG. 19 is a perspective view showing a roller 51E provided in an unevenness forming device 5E used in the unevenness forming step according to the second reference example.

The blade portion 51a of the roller 51 in the unevenness forming device 5 used in the unevenness forming process according to the first embodiment extends continuously along the width direction parallel to the rotation axis 51x of the roller 51 . On the other hand, the plurality of blade portions 51e in the roller 51E provided in the unevenness forming device 5E according to the second reference example are arranged at intervals along the circumferential direction and arranged at intervals along the width direction. .

Each blade portion 51e is formed in a triangular shape when viewed from the radially outer side. Each blade portion 51e protrudes radially outward from each roller outer peripheral surface 51o.

[Third reference example]
Next, the roller 51F provided in the unevenness forming device 5F according to the third reference example will be described. FIG. 20 is a perspective view showing a roller 51F included in an unevenness forming device 5F used in the unevenness forming step according to the third reference example.

The blade portion 51a of the roller 51 in the unevenness forming device 5 used in the unevenness forming process according to the first embodiment extends continuously along the width direction parallel to the rotation axis 51x of the roller 51 . On the other hand, the plurality of blade portions 51f in the roller 51F provided in the unevenness forming device 5F according to the third reference example are arranged at intervals along the circumferential direction and arranged at intervals along the width direction. .

Each blade portion 51f is formed in a circular shape when viewed from the radially outer side. Each blade portion 51f protrudes radially outward from each roller outer peripheral surface 51o.

[First Modification of First Embodiment]
Next, an electric wire 3A according to a first modified example of the first embodiment will be described. FIG. 21 is a cross-sectional view orthogonal to the first direction L, which is the extending direction of the wire 32, in the electric wire 3A according to the first modified example of the first embodiment.

Each wire 32 of the electric wire 3 according to the first embodiment has a circular shape when viewed from the first direction L, which is the extending direction of the wire 32 . On the other hand, each strand 32 of the electric wire 3A according to the first modification is rhombus when viewed from the first direction L, which is the extending direction of the strand 32 .

[Second Modification of First Embodiment]
Next, an electric wire 3B according to a second modified example of the first embodiment will be described. FIG. 22 is a cross-sectional view orthogonal to the first direction L, which is the extending direction of the wire 32, in the electric wire 3B according to the second modification of the first embodiment.

Each wire 32 of the electric wire 3 according to the first embodiment has a circular shape when viewed from the first direction L, which is the extending direction of the wire 32 . On the other hand, each wire 32 of the electric wire 3B according to the second modification is rectangular when viewed from the first direction L, which is the extending direction of the wire 32 .

[Third Modification of First Embodiment]
Next, an electric wire 3C according to a third modified example of the first embodiment will be described. FIG. 23 is a cross-sectional view orthogonal to the first direction L, which is the extending direction of the wire 32, in the electric wire 3C according to the third modification of the first embodiment.

Each wire 32 of the electric wire 3 according to the first embodiment has a circular shape when viewed from the first direction L, which is the extending direction of the wire 32 . On the other hand, each strand 32 of the electric wire 3C according to the third modification is square when viewed from the first direction L, which is the extending direction of the strand 32 .

In addition, linear unevenness|corrugation 32e which concerns on embodiment mentioned above demonstrated what orthogonally crosses the 1st direction L which is an extension direction. However, the linear unevenness 32e according to this embodiment is not limited thereto. For example, the linear unevenness 32e may extend obliquely with respect to the first direction L, which is the extending direction. In addition, the linear unevenness 32e may be spirally formed.

Moreover, the electric wire 3 which concerns on embodiment mentioned above demonstrated that the width|variety of the unevenness|corrugation 32e in each strand 32 is the same. However, the electric wire 3 according to the present embodiment is not limited to this, and the widths of the irregularities 32e formed on the wire outer peripheral surfaces 32o may be formed with different widths in the plurality of wires 32 .

Further, in the embodiment described above, all the strands 32 forming the electric wire 3 have the unevenness 32e formed on the strand outer peripheral surface 32o. However, the electric wire 3 according to this embodiment is not limited thereto. For example, while unevenness 32e is formed on the wire outer peripheral surface 32o of all the wires 32 constituting the non-outer peripheral surface forming strand 32b, the outer peripheral surface forming wire 32a does not form the unevenness 32e and has a flat outer peripheral surface. may have

Further, in the electric wire 1 with a terminal according to the embodiment described above, the first crimping pieces 16a and 16b are crimped to the conductor 31 in a so-called B crimp. However, in the electric wire 1 with a terminal according to the present embodiment, the method of crimping the first crimping pieces 16a and 16b to the conductor 31 is not limited to the so-called B crimp. For example, the first crimping pieces 16a and 16b may be wound around the conductor 31 such that the first crimping piece 16b overlaps the first crimping piece 16a. The method of crimping the covering crimping portion 14 to the covering member 33 is also the same.

Reference Signs List 1 wire with terminal 12 conductor crimping portion 2 metal terminal 3, 3A, 3B, 3C wire 30 metal material 31 conductor 31a exposed conductor portion 32 wire 32a wire with outer peripheral surface 32b wire with no outer peripheral surface 32e unevenness 32o outer periphery of wire Surface 33 Covering member 51, 51A, 51B, 51C Roller 51a Blade 51o Roller outer peripheral surface L First direction (extending direction)
W second direction (direction orthogonal to the extension direction)
H third direction (direction orthogonal to the extension direction)

Claims (3)

a conductive conductor formed by twisting a plurality of strands;
an insulating covering member that covers the conductor;
with
The plurality of strands have an outer peripheral surface forming strand that forms the conductor outer peripheral surface of the conductor and a non-outer peripheral surface forming strand that does not form the conductor outer peripheral surface,
At least the wire outer peripheral surface of the non-peripheral surface-forming strand is formed with a plurality of linear irregularities that extend across the extending direction of each of the non-peripheral surface-forming strands.
An electric wire characterized by: The electric wire according to claim 1;
a metal terminal electrically connected to the conductor;
with
The electric wire has a conductor exposed portion that exposes the conductor to the outside from the covering member at the end of the electric wire,
The metal terminal has a conductor crimping portion that is crimped to the conductor exposed portion,
An electric wire with a terminal characterized by: a conductive conductor formed by twisting a plurality of strands;
an insulating covering member that covers the conductor;
A method for manufacturing an electric wire comprising
A wire forming step of forming a wire by extending a conductive columnar metal material along an extending direction and compressing it in a direction orthogonal to the extending direction;
Among the plurality of strands, at least a non-peripheral surface-forming element wire that does not form a conductor outer peripheral surface of the conductor extends to the outer peripheral surface of the strand, intersecting with the extending direction of the non-peripheral surface-forming strand. an unevenness forming step of forming a plurality of existing linear unevenness;
a conductor forming step of twisting the plurality of strands to form the conductor;
a covering step of covering the conductor with the covering member;
including
The unevenness forming step is formed on a roller outer peripheral surface of a roller that feeds each of the wires from each of the wire forming steps to the conductor forming step, protrudes radially outward from the roller outer peripheral surface, and extends in the circumferential direction of the roller. The unevenness is formed on the outer peripheral surface of the wire by transferring the blade portions arranged at intervals,
A method for manufacturing an electric wire, characterized by:

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