JP2016001551A - Cable and wire with crimped terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire with a crimped terminal which does not cause troubles, like damage of the element wire, in crimping and allows easy acquisition of a conductive state.SOLUTION: In a cable 11 including a conductor 13 composed of a plurality of element wires 12 and an insulation coating 14 covering the conductor 13, an element wire integration part 16 for jointing the element wires 12 together is formed in the tip part of the conductor 13 with a terminal part of the insulation coating 14 removed. Between the element wire integration part 16 and the terminal of the insulation coating 14, there is provided an element wire bundling part 17 in which the element wires 12 are not integrated. The element wire integration par 16 has a semispherical curved surface 16a at the tip and is spherical or nearly spherical, with the vertical cross section being circular or nearly circular.

Description

  The present invention relates to a covered electric wire having a conductor composed of a plurality of strands, and more particularly to a covered electric wire that can provide good conduction when, for example, a crimp terminal is connected.

  For example, the covered electric wire is bundled after a crimp terminal is connected to a conductor to form a wire harness, and is wired for power supply of an automobile or the like.

  In order to connect the crimp terminal to the covered electric wire, after removing the insulation coating from the end portion of the covered electric wire to expose the conductor, the crimp portion of the crimp terminal is caulked against the exposed portion of the conductor. By caulking the crimping part, the strands constituting the conductor are brought into contact with the crimping part of the crimping terminal and conduction is obtained between the crimping terminal.

  However, particularly in wire harnesses used in automobiles, aluminum or aluminum alloy wires are often used for weight reduction. An oxide film having poor conductivity can be formed on the surface of the element wire, but in particular, in the case of an element wire made of aluminum or aluminum alloy, a stronger oxide film can be formed as compared with an element wire made of copper or copper alloy.

  For this reason, when the conductor of the covered electric wire and the crimp terminal are connected, the portion where the crimp terminal and the conductor are in direct contact with each other is easy to obtain conduction, but the contact portion between the strands is not compressed well and good conduction is obtained. Cannot be obtained. When the number of strands constituting the conductor increases, the number of strands not in direct contact with the crimp terminal increases, and the resistance value of the crimp portion is likely to increase. In particular, in the case of a thick (large diameter) covered electric wire, the above-mentioned problem becomes remarkable. Here, in the case of a covered electric wire used in an automobile, the thick material means a conductor whose thickness is mainly 3 sq or more.

  In order to reduce the resistance between the wires constituting the conductor, it is conceivable that when crimping the crimping part, it is strongly compressed to destroy the oxide film. There is a problem that the crimping part of the terminal is greatly extended.

  In the following Patent Document 1, a method of joining strands by ultrasonic welding is proposed.

  However, when joined by ultrasonic welding, the welded portion of the strand is greatly elongated and deformed by the pressure applied to the strand. As a result, there arises a problem that when the crimp terminal is connected, the allowance does not fit within a predetermined range, and it is difficult to obtain a good crimp shape.

  In the following Patent Document 2, a method of joining the strands with solder is proposed.

  However, in the case of joining with solder, there is a problem that the soldering cost is increased and the solder attachment distance varies depending on the surface state of the wire. In addition, since solder adheres to a metal other than the wire, the solder deteriorates due to moisture adhering to it, and the solder cracks or falls off due to impact, so it has sufficient durability. Was hard to expect.

  In addition, when joining by ultrasonic welding, the welded portion 101 has a rectangular longitudinal section as shown in FIG. 17, and when joined by soldering, soldering as shown in FIG. Depending on the state, the longitudinal cross-sectional shape of the solder portion 102 becomes an indefinite shape such as an ellipse, so that the stability at the time of crimping in the crimped portion 103 of the welded portion 101 or the solder portion 102 is poor, and the welded portion 101 or Since the postures of the solder portion 102 and the portion that continues to the solder portion 102 are difficult to be determined, there is a problem in that it is difficult to press the crimping portion 103 into a desired crimping shape.

Japanese Patent No. 5428722 JP 2010-225529 A

  Therefore, the main object of the present invention is to easily obtain a good conduction state without any inconvenience such as damage to the strands.

  A means for this is a covered electric wire having a conductor composed of a plurality of strands and an insulating coating covering the conductor, and is formed at the tip of the conductor from which the end portion of the insulating coating is peeled off. A wire integrated portion for joining wires, and a wire bundle portion between the wire integrated portion and the terminal of the insulation coating, and the vertical cross-sectional shape of the wire integrated portion is circular or substantially circular It is a covered electric wire.

  The element wire is made of an appropriate material such as copper or copper alloy in addition to aluminum or aluminum alloy.

  Since the strand integrated part has a plurality of strands integrated, it is a single wire. The strand bundle portion is a disjoint portion where the strands are not integrated, and may be untwisted or twisted. The vertical cross section is a cross section in a direction perpendicular to the longitudinal direction of the strands (hereinafter the same).

  In this configuration, the element integration unit obtains sufficient conduction between the elements and reduces the resistance between the elements. Further, the strand integration portion makes the strand bundle portion have a circular or substantially circular longitudinal cross-sectional shape. In other words, it is possible to conduct conduction between the strands without caulking the crimping portion by strong compression, and it is possible to crimp the strands of the strands of wire to a good crimping shape. Get enough conduction.

  The strand integration part may have a curved surface that bends into a spherical shape at the tip surface. In this case, the strand integrated part is generally hemispherical or substantially hemispherical. The curved surface may have a shape with some unevenness.

  In this configuration, the curved surface suppresses the adhesion of moisture, makes the coating state for anticorrosion good, and enhances the durability of the obtained good conductive state.

  The strand integrated part may be formed of only the material constituting the strand. The strand integrated part can be formed by, for example, laser welding or arc welding.

  In this configuration, since no metal other than the metal constituting the strand is used in the strand integrated portion, it is possible to suppress a part from accidentally dropping off or cracking, and the obtained good The durability of the conductive state can be improved.

  Another means for solving the problem is a wire with a crimp terminal including a conductor composed of a plurality of strands and a covered electric wire having an insulation coating covering the conductor, and a crimp terminal connected to the conductor by crimping. And the said covered electric wire is a covered electric wire comprised as mentioned above, and is an electric wire with a crimp terminal by which the crimp part of the said crimp terminal was crimped | bonded to the said strand bundle part.

  The said crimping | compression-bonding part is good also to crimp | bond also to a part of strand integrated part of the said covered electric wire. Also in the wire integrated part, conduction with the crimping part can be achieved.

  You may form the coating | coated part for anti-corrosion which coat | covers this site | part in the site | part which has the said strand integrated part at least in the said crimping | compression-bonding part. The covering portion can be formed by a resin coating, a heat shrinkable tube covering, or the like.

  Another means for solving the problem is a wire harness having a plurality of covered electric wires including the aforementioned electric wires or the aforementioned electric wires with crimp terminals.

  Another means for solving the problem is a method of manufacturing a covered electric wire having a conductor composed of a plurality of strands and an insulating coating covering the conductor, and a crimp portion of a crimp terminal is crimped to the conductor. A strip process for peeling off the end portion of the insulation coating, and a strand in which the strands are joined to only the material constituting the strand by laser welding or arc welding at the tip of the conductor exposed in the strip step. It is a manufacturing method of the covered electric wire which comprises the integration process which forms a wire integration part, and makes the longitudinal section shape of the above-mentioned strand integration part circular or substantially circular in the integration process.

  Between the strip process and the integration process, a shaping process for adjusting the strands into a desired shape may be provided.

  According to the present invention, the wire integrated portion reduces the resistance between the wires constituting the conductor and arranges the shape of the wire bundle portion, so that a good conduction state between the conductor and the crimp terminal can be easily obtained. can get.

The perspective view of a covered wire and a crimp terminal. The perspective view of an electric wire with a crimp terminal. Sectional drawing of an electric wire with a crimp terminal. The side view of an electric wire with a crimp terminal. The schematic diagram which shows formation of the strand integrated part by laser welding. The schematic diagram which shows formation of the strand integrated part by laser welding. The schematic diagram which shows formation of the strand integrated part by arc welding. A photograph of the wire integrated part formed by arc welding. Sectional drawing which shows the state before the crimping | compression-bonding of a strand integrated part. Sectional drawing which shows the state at the time of crimping | bonding of a strand bundle part, and its comparative example. Sectional drawing which shows the action state of the principal part of an electric wire with a crimp terminal. Sectional drawing which shows the action state of the principal part of an electric wire with a crimp terminal. Sectional drawing of the electric wire with a crimp terminal which has a coating | coated part. The perspective view of the electric wire with a crimp terminal which has a coating | coated part. Sectional drawing of the electric wire with a crimp terminal which shows a comparative example. Sectional drawing of an electric wire with a crimp terminal. Sectional drawing which shows the state before the crimping | compression-bonding of a prior art. Sectional drawing which shows the state before the crimping | compression-bonding of a prior art.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of the covered electric wire 11 and the crimp terminal 21, and FIG. 2 is a perspective view of the electric wire 31 with the crimp terminal. First, the outline of the covered wire 11 and the crimped terminal-attached wire 31 will be described. As shown in FIG. 1, the covered wire 11 includes a conductor 13 composed of a plurality of strands 12 and an insulating coating 14 covering the conductor 13. Have The material of the strand 12 is aluminum, aluminum alloy, copper, copper alloy, or the like. The insulating coating 14 is made of synthetic resin and can be peeled off from the conductor 13.

  As an example of a so-called thick wire covered aluminum wire (aluminum thick wire), there are wire diameters of 0.32 mm × 37 wires (4 layers) and 3 sq.

  The terminal portion of the covered electric wire 11 has an exposed portion 15 where the insulating coating 14 is removed over an appropriate range to connect the crimp terminal 21 and the conductor 13 is exposed.

  The exposed portion 15 of the conductor 13 is provided with a strand integration portion 16 and a strand bundle portion 17. The strand integrated portion 16 is formed at the tip of the exposed portion 15 of the conductor 13 and is a portion that joins the strands 12 together. The longitudinal cross-sectional shape of the strand integrated part 16 is circular or substantially circular, in other words, circular. A vertical cross section means a cross section in a direction orthogonal to the longitudinal direction of the conductor 13. The strand integrated part 16 is formed by welding, for example, laser welding or arc welding.

  The strand bundle portion 17 is a portion located between the strand integrated portion 16 and the end of the insulation coating 14 and is a portion in which the strands 12 are in contact with each other. The strands 12 may not be twisted as shown in FIG. 1 but may be twisted.

  As the crimp terminal 21, an appropriate one is used according to the application of the covered electric wire 11. The crimp terminal 21 in the illustrated example is a so-called known round terminal having an annular connection part 22 on one side in the longitudinal direction and a crimp part 23 to be crimped to the conductor 13 of the covered electric wire 11 on the other side. doing.

  The crimp terminal 21 is a so-called open barrel type, and the crimp part 23 has a wire barrel 23a and an insulation barrel 23b from the connection part 22 side. As shown in FIGS. 2 and 3, the wire barrel 23 a is a portion mainly crimped to the above-described strand bundle portion 17 in the exposed portion 15 of the conductor 13, and corresponds to a “crimp portion” of the present invention. The insulation barrel 23 b is a part that is crimped to the insulating coating 14. The crimp terminal 21 may be other types such as a closed barrel type in addition to an open barrel type.

  Since the covered wire 11 has the above-described configuration, the covered wire 11 is manufactured as follows. That is, the strip 12 is made of only the material constituting the strand 12 by laser welding or arc welding at the tip portion of the exposed portion 15 of the conductor 13 exposed in the strip step and the strip step of peeling the terminal portion of the insulating coating 14. It is provided with an integration step of forming the wire integrated portion 16 that joins each other, and in this integration step, it is manufactured by the method of manufacturing the covered electric wire 11 in which the longitudinal cross-sectional shape of the wire integrated portion 16 is circular or substantially circular. it can.

  In the strip step, the terminal portion of the insulating coating 14 is peeled off by a predetermined length in consideration of the subsequent integration step, that is, the formation of the wire integrated portion 16 and the shape of the crimp terminal 21. Peeling can be performed by a known method.

  In the integration step, for example, the wire integrated portions 16 having various shapes as illustrated in FIG. 4 can be formed.

  4A has the same shape as that of the strand integration portion 16 shown in FIGS. 1, 2, and 3, and is generally spherical as a whole. In other words, the longitudinal cross-sectional shape of the strand integrated portion 16 is circular or substantially circular regardless of where it is cut, and the tip surface and the strand bundle portion 17 side surface have a curved surface 16a that bends into a spherical shape. Further, the largest diameter portion of the strand integrated portion 16 is larger than the thickness of the strand bundle portion 17.

  In the strand integrated part 16 of FIG. 4B, the largest diameter portion is slightly smaller than the thickness of the strand bundle portion 17. This is because all the strands 12 need only be integrated. Further, a curved surface 16a that bends into a spherical shape, specifically, a hemispherical surface or a substantially hemispherical surface, is formed on the distal end surface of the strand integrated portion 16. The curved surface 16 a is a hemispherical surface smaller than the hemispherical surface based on the diameter of the conductor 13.

  4C has a hemispherical shape in which the base is formed to be larger than the diameter of the conductor 13. The distal end surface has a curved surface 16a that bends into a spherical shape, specifically, a hemispherical surface or a substantially hemispherical surface.

  4D is formed in a shape that is long in the longitudinal direction of the conductor 13. The tip surface has a curved surface 16a that bends into a spherical shape. Although the length of the strand integrated part 16 can be determined as appropriate, it can be increased to, for example, about three times the diameter of the conductor 3.

  4E is formed in a shape that is short in the longitudinal direction of the conductor 13. The tip surface has a curved surface 16a that bends into a spherical shape. Although the length of the strand integrated part 16 can be determined as appropriate, it can be reduced to, for example, about 1/3 of the conductor diameter.

  4 (f) is basically formed in a spherical or hemispherical shape, and has a curved surface 16a that is spherical in shape at the tip end surface, but has a slight dent 16b on the surface of the curved surface 16a. It is the shape which has.

  These shapes of the wire integrated part 16 are merely examples, and other shapes may be used.

  When forming the strand integrated part 16 by laser welding, it can be performed as schematically shown in FIG. That is, the covered electric wire 11 from which the terminal portion of the insulating coating 14 is peeled is held by a rotating jig (not shown), and the wire integrated portion 16 on the peripheral surface of the conductor 13 is rotated while the covered electric wire 11 is rotated around the axis. A laser 41 is irradiated to a position to be formed. When a part of the conductor 13 is melted, the melted portion is melted and integrated by the surface tension of the molten metal, and the melted tip is retracted to obtain a spherical wire integrated portion 16 as a whole.

  In addition, laser welding may be performed on the tip surface of the conductor 13, as schematically shown in FIG. That is, the covered electric wire 11 from which the end portion of the insulating coating 14 is peeled is fixed, the laser 41 is directed to the tip surface of the conductor 13, and the laser 41 is irradiated zigzag to the tip surface to perform laser welding on the entire tip surface. I do. When a part of the conductor 13 is melted, the melted portion is melted and integrated by the surface tension of the molten metal, and the central portion rises and the hemispherical wire integrated portion 16 is obtained.

  In the case where the strand integrated part 16 is formed by arc welding, welding is performed on the tip surface of the conductor 13 as schematically shown in FIG. That is, the covered electric wire 11 from which the terminal portion of the insulating coating 14 is peeled is fixed, and the arc 42 is generated toward the front end surface of the conductor 13. When a part of the conductor 13 is melted, the melted portion is melted and integrated by the surface tension of the molten metal, and the central portion rises and the hemispherical wire integrated portion 16 is obtained.

  FIG. 8 is a photograph showing an example in which the strand integrated part 16 is formed by arc welding on two types of covered electric wires 11 made of aluminum strands having different thicknesses. As shown in this photograph, it is possible to form a hemispherical strand integrated portion 16 having a circular or substantially circular longitudinal cross-sectional shape and having a spherical curved surface 16a on the tip surface.

  The coated electric wire 11 having the strand integrated part 16 manufactured as described above is connected to the crimp terminal 21 and becomes an electric wire 31 with a crimp terminal as shown in FIGS. When the crimp terminal 21 is connected, the wire bundle portion 17 is mainly positioned in the wire barrel 23a of the crimp terminal 21, and the end of the insulating coating 14 is positioned inside the insulation barrel 23b of the crimp terminal 21, so that the wire barrel 23a and the insulation are connected. Caulking the barrel 23b.

  The electric wire 31 with a crimp terminal is bundled together with other electric wires to form a wire harness having a plurality of covered electric wires including the electric wire 31 with a crimp terminal, and is routed to a predetermined part.

  Since the electric wire 31 with a crimp terminal is the above-mentioned structure, it has the following effects.

  When caulking the crimp terminal 21 to the electric wire 31 with the crimp terminal, the longitudinal cross-sectional shape of the strand integrated portion 16 is circular or substantially circular, and the strand bundle portion 17 is also cylindrical. Since the strand integrated portion 16 is smoothly connected to the strand bundle portion 17, when strands are joined by conventional ultrasonic welding (see FIG. 16), the strands are joined by soldering. Compared to the case (see FIG. 17), the operation is easier when the crimping terminal 21 is inserted into the crimping portion 23. That is, as shown in FIG. 9, since the longitudinal cross-sectional shape of the strand integrated part 16 is circular or substantially circular, the strand bundle part 17 connected to the strand integrated part 16 is connected to the wire barrel 23a of the crimping part 23. It is not necessary to consider the angle in the direction around the axis of the conductor 13 when it is inserted, and the stability of the posture after being inserted into the crimping part 23 is good.

  When the wire barrel 23a is caulked against the strand bundle portion 17 in this state, the strand bundle portion 17 in contact with the wire barrel 23a is separated for each strand 12, but the strand integration portion 16 exists. Therefore, local stress concentration does not act on the wire barrel 23a divided into the left and right sides during caulking. For this reason, as described above, coupled with the good stability of the wire bundle portion 17 with respect to the wire barrel 23a, the winding of the wire barrel 23a becomes unbalanced as shown by the phantom line in FIG. In other words, the winding state of the wire barrel 23a is equal to the left and right. In addition, the wire bundle portion 17 flexibly follows the deformation of the wire barrel 23a due to caulking, and a good contact state is obtained.

  FIG. 10B is a comparative example, and when crimping is performed on the melted and integrated portion 19, the portion is made into a single wire, so that it is difficult to follow the deformation of the wire barrel 23 a. Even if the wire barrel 23a is crimped to a desired shape, partial contact with the melt-integrated portion 19 is obtained, but good contact with a wide contact area as a whole is difficult to obtain.

  On the other hand, since the covered electric wire 11 has the strand bundle part 17 and mainly crimps | bonds the wire barrel 23a with respect to this strand bundle part 17, favorable contact property is obtained.

  In addition, since the strand integrated portion 16 at the tip of the conductor 13 collects the plurality of strands 12, the variation in the tip shape of the conductor 13 is small when the crimp portion 23 of the crimp terminal 21 is crimped. Therefore, inspections such as departure management are easy.

  FIG. 11 is an explanatory diagram showing a crimped state of the strand integrated portion 16 and the strand bundle portion 17 by the crimping portion (wire barrel 23a). As shown in this figure, since all the strands 12 are joined by the strand integration portion 16, conduction between the strands 12 can be achieved, and the resistance between the strands 12 can be reduced. . Moreover, since the strand integrated part 16 arranges the form of the strand bundle part 17 and makes the contact between the strand bundle part 17 and the crimp terminal 21 as described above, it is favorable between the conductor 13 and the crimp terminal 21. A good conduction state. In addition, when crimping the crimp terminal 21, there is no need for strong compression, and it is only necessary to crimp the crimp terminal 21, so that the crimp terminal 21 can be easily connected. In addition, in the finished state, there is little variation between products, and a homogeneous product can be stably obtained.

  When the covered electric wire 11 is thick, the number of the strands 12 located in the center part of the conductor 13 is large. For example, in the case of the 3 sq aluminum thick wire with the wire diameter of 0.32 mm × 37 wires (4 layers) in the above example, one wire, six wires, and 12 wires are arranged in order from the center inside the wires 12 arranged in the outermost layer. There are 19 wires 12 in total. Each of the strands 12 in the center has an oxide film on the surface, and the oxide film between the strands 12 cannot be broken only by the crimping by the wire barrel 23a, and it is difficult to obtain conduction between the strands 12. Conductivity cannot be obtained between the strands 12 as much as the center strand 12. However, even if the wires 12 are not electrically connected in the direction in which they are in contact with each other by strong compression, the wire integrated portion 16 makes the wires 12 conductive at the tip of the wire 12. The strands 12 of the outer periphery of the strand 13 of the conductor 13 are electrically connected to the crimping terminal 21 because the oxide film is broken by the crimping of the crimping terminal 21 by the wire barrel 23a. For this reason, good conduction is obtained between the conductor 13 and the crimp terminal 21, and in particular, in the thick coated electric wire 11, good conduction can be obtained without inconvenience such as impairing the mechanical strength of the conductor 13.

  FIG. 12 is an explanatory diagram showing a state in which the crimping by the wire barrel 23 a is also performed on a part of the strand integrated part 16 of the covered electric wire 11. As shown in this figure, when the tip of the wire barrel 23a of the crimp terminal 21 is in direct contact with the strand integrated portion 16 in a state where the oxide film is broken, an even better conductive state can be obtained. .

  For the electric wire 31 with the crimp terminal to which the crimp terminal 21 is connected, an anticorrosion covering portion for covering this portion is formed on the portion having at least the strand integrated portion 16 in the crimp portion 23 for corrosion prevention. You can also.

  The covering portion can be formed by a resin layer 32 coated with a resin as shown in FIG. 13, or a covering tube 33 covered with a heat shrinkable tube as shown in FIG. The resin layer 32 integrally covers the front end of the wire barrel 23a of the crimping part 23 and the entire surface of the wire integrated part 16 protruding from the front end of the wire barrel 23a. The covering tube 33 covers the entire crimping portion 23 including the entire surface of the wire integrated portion 16 protruding from the tip of the wire barrel 23a.

  If the above-described strand integrated part 16 is not present, the strands 12 are in a disjoint state as shown in FIG. 15. Therefore, even if the resin layer 32 is formed, 12 may not be covered with the resin layer 32. In this case, moisture adheres between the strands 12 jumping out from the resin layer 32 and causes corrosion.

  On the other hand, since the element | wire integrated part 16 smoothes the front-end | tip of the conductor 13, even when the resin layer 32 is thin, it can protect uniformly as shown in FIG. That is, the formation of the resin layer 32 can be ensured and the formation state can be maintained. For this reason, it is possible to prevent corrosion and maintain a good conduction state over a long period of time, and the amount of resin used for that purpose can be suppressed, and workability can be improved.

  The same applies to the case where the covering portion is formed by the covering tube 33, and since the strand integrated portion 16 eliminates the protruding state of the strand 12, the heat shrinkable tube can be prevented from being damaged when the heat shrinkable tube contracts. . That is, the formation of the covering tube 33 can be ensured and the formation state can be maintained. For this reason, it is possible to prevent corrosion and maintain a good conduction state over a long period of time.

  In the cross-sectional view of the electric wire with the crimp terminal in FIG. 3, the state where the tip end portion of the wire barrel 23 a in the crimp portion 23 of the crimp terminal 21 is crimped so as to expand toward the tip side is shown. By caulking the tip of the barrel 23a into a flat shape and reducing the allowance L, the above-mentioned covering portion, that is, a good covering state of the resin layer 32 and the covering tube 33 can be obtained. Moreover, it can be ensured. In this case, the allowance L must be larger than 0.0 mm. If the tip of the strand is inside the wire barrel, it cannot be determined whether the strand is crimped to a normal length wire barrel, and the electrical characteristics may deteriorate. Further, if the allowance is too long, a gap may be formed in the resin layer, and the anticorrosion property may be lowered. Preferably, the thickness is about 0.5 mm to 1.0 mm.

  That is, when such a caulking state is obtained, the resin layer 32 is easily applied. In addition, when the covered electric wire 11 is a thick material of 20 sq or more, the anticorrosion is intended with a covered tube mainly made of a heat-shrinkable tube. In this case, the heat-shrinkable tube is not easily broken.

  Further, since the tip end surface of the strand integrated portion 16 is a spherical curved surface 16a, it is possible to prevent moisture from adhering to the strand as compared with the case where the strand 12 is separated as shown in FIG. This contributes to improving the durability of the wire integrated part 16. In addition, the strand integrated portion 16 is formed by melting and integrating the materials constituting the strand 12, and since no material other than the strand 12 is used, the strand integrated portion 16 is the strand 12. It will not deteriorate faster than. Moreover, since the wire integrated part 16 is not easily damaged or dropped off, this point is also effective in maintaining a good conduction state.

  In addition, since the wire integrated part 16 is a metallic and glossy part, image inspection and the like can be easily performed. For this reason, a series of work processes from the inspection of the covered electric wire 11 to the connection of the crimp terminal and the inspection thereof become smooth.

  As described above, the covered electric wire 11 reduces the resistance between the strands 12 in which the strand integrated portion 16 constitutes the conductor 13 and arranges the shape of the strand bundle portion 17. A good conduction state can be easily obtained. In particular, it greatly contributes to the covered electric wire 11 referred to as a thick product of 3 sq or more.

  A good conduction state can be maintained over a long period of time by the material constituting the strand integrated portion 16 and the curved surface 16a at the tip.

  Therefore, the electric wire 31 with a crimp terminal using such a covered electric wire 11 has a small resistance and can provide good conduction. Similarly, the wire harness comprised using the above-mentioned covered electric wire 11 can acquire the outstanding conduction | electrical_connection, and can improve the performance and durability of wiring objects, such as a motor vehicle.

In correspondence between the configuration of the present invention and the configuration of the above-described embodiment,
The crimping portion of the present invention corresponds to the wire barrel 23a described above,
Similarly,
The covering portion corresponds to the resin layer 32 and the covering tube 33,
The present invention is not limited to the above-described configuration, and other forms can be adopted.

  For example, the crimp portion of the crimp terminal may have a shape other than the above example.

  In addition to the coating portion for preventing corrosion, the element unit 16 may include a member having other functions.

DESCRIPTION OF SYMBOLS 11 ... Covered electric wire 12 ... Wire 13 ... Conductor 14 ... Insulation coating 16 ... Wire integrated part 16a ... Curved surface 17 ... Wire bundle part 21 ... Crimp terminal 23 ... Crimp part 23a ... Wire barrel 31 ... Electric wire with a crimp terminal 32 ... Resin layer 33 ... Coated tube 41 ... Laser 42 ... Arc

Claims (8)

A covered electric wire having a conductor composed of a plurality of strands and an insulating coating covering the conductor,
A wire integrated portion that is formed at the tip of the conductor from which the terminal portion of the insulating coating has been peeled and joins the wires;
A wire bundle portion between the wire integrated portion and the end of the insulation coating;
The covered electric wire whose longitudinal cross-sectional shape of the said strand integrated part is circular or substantially circular. The covered electric wire according to claim 1, wherein a tip end surface of the element wire integrated portion has a curved surface that is curved into a spherical shape. The covered electric wire according to claim 1 or 2, wherein the strand integrated portion is formed only of a material constituting the strand. A wire with a crimp terminal comprising a conductor consisting of a plurality of strands and a covered electric wire having an insulation coating covering the conductor, and a crimp terminal connected to the conductor by crimping,
The said covered electric wire is the covered electric wire as described in any one of Claims 1-3,
An electric wire with a crimp terminal in which a crimp portion of the crimp terminal is crimped to the wire bundle portion. The electric wire with a crimp terminal according to claim 4, wherein the crimp portion is also crimped to a part of the wire integrated portion of the covered electric wire. The electric wire with a crimping terminal according to claim 4 or 5, wherein an anticorrosion covering portion for covering the portion is formed at a portion having at least the element wire integrated portion in the crimping portion. A wire harness having a plurality of covered electric wires including any one of the electric wires of claims 1 to 3 or the electric wire with crimp terminal according to any one of claims 4 to 6. A method of manufacturing a covered electric wire having a conductor composed of a plurality of strands and an insulating coating covering the conductor, wherein a crimp portion of a crimp terminal is crimped to the conductor,
Stripping process for peeling off the terminal portion of the insulating coating;
An integration step of forming a wire integrated portion in which the strands are joined to each other only by a material constituting the strands by laser welding or arc welding at a tip portion of the conductor exposed in the strip step;
In the integration step, a method of manufacturing a covered electric wire in which a vertical cross-sectional shape of the element integration portion is circular or substantially circular.