JP2011198514A - Electric wire with terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent certainly electrolytic corrosion of a connection portion between an electric wire and a terminal fitting without using an anticorrosive.SOLUTION: The electric wire with the terminal fitting is constructed of an aluminum wire 10 in which a metallic core wire 11 is covered with an insulating coating 13, a female terminal fitting 20 which is made of a different kind of metal from the core wire 11 and has a pair of barrels 25, 26 to be connected to the aluminum wire 10, a serration member 40 having a crimping face 42 to be crimped to the core wire 11 which is exposed with the insulating coating 13 of the aluminum wire 10 peeled off, and a metal cap 30 which is made of a metal with a close ionization tendency with the female terminal fitting 20 and is crimped throughout from the end of the exposed core wire 11 to the end of the remaining insulating coating 13, and is crimped to the both barrels 25, 26 in a state sealing the end of the remaining insulating coating 13.

Description

  The present invention relates to an electric wire with a terminal fitting.

  In recent years, aluminum electric wires have been used in the field of automobile wire harnesses and the like for the purpose of weight reduction and the like. An aluminum electric wire has, for example, a structure in which a core wire made of a twisted wire obtained by twisting a plurality of aluminum strands is covered with an insulating coating, and when a harness is formed, a terminal fitting is generally connected to the end of the electric wire. Specifically, the terminal end of the aluminum wire is peeled off to expose the end of the core wire, and the wire barrel (electric wire connecting portion) provided on the terminal fitting is crimped to the exposed end of the core wire. In addition, an insulation barrel provided behind the wire barrel is crimped and connected to the terminal of the insulation coating remaining together (for example, see Patent Document 1).

By the way, when conducting the electrical connection of the electric wire to the terminal fitting, when the core wire of the electric wire and the terminal fitting are formed of different kinds of metals, especially when moisture is present at the contact portion between the two, the two metals dissolve as ions in the water. It is known that galvanic corrosion occurs due to electrochemical reaction. Since terminal fittings are generally made of a copper alloy due to problems in strength and the like, if aluminum wires are used for the wires as described above, electrolytic corrosion is a problem. Specifically, at the portion where the wire barrel is crimped to the core wire, when dust or sand enters and the mixed salt adheres and moisture further adheres, the contact portion becomes immersed in the electrolyte solution, and ionization occurs. There is a possibility that aluminum which is a metal having a large tendency (base metal) is dissolved, that is, electrolytic corrosion proceeds.
Conventionally, therefore, electrolytic corrosion has been prevented by applying an anticorrosive agent made of silicone rubber, a chelating agent or the like to the crimped portion of the wire barrel.

JP-A-2005-50736

However, in the above-described method of applying the anticorrosive agent, it is necessary to change the application conditions depending on the pressure-bonding shape of the barrel, the thickness of the application layer varies, the quality is not stable, the care of peeling of the application layer is necessary, and There were a number of problems, such as inability to easily repair during maintenance, and the emergence of new countermeasures was anxious.
The present invention has been completed based on the above situation, and an object of the present invention is to reliably prevent electrolytic corrosion at the connection portion between the electric wire and the terminal fitting without using an anticorrosive agent.

<Configuration 1 of the present invention>
The electric wire with a terminal fitting of the present invention is an electric wire in which a metal core wire is covered with a coating, the core wire is made of a different kind of metal, and is provided with a terminal fitting provided with an electric wire connecting portion connected to the electric wire, A serration member having a concavo-convex surface that is crimped to the core wire exposed by peeling the sheath of the electric wire, and a metal that is close in ionization tendency to the terminal fitting, and is left from the end of the exposed core wire It is characterized in that it is composed of a metal cap that is crimped over the end of the coating and is crimped to the wire connecting portion in a state of sealing between the remaining coating ends.

  According to such a structure, the area | region from the terminal of the exposed core wire to the terminal of the coating | cover remaining is covered with a metal cap, and the terminal of the exposed core wire is waterproofed. Further, since the space between the metal cap and the remaining end of the coating is sealed, water intrusion into the metal cap is prevented. And the electric connection between a core wire and a terminal metal fitting is taken by crimping | bonding the electric wire connection part of a terminal metal fitting to a metal cap.

  In the crimped portion of the wire connecting portion, the metals that are close to ionization are in contact with each other, so even if moisture adheres, electrolytic corrosion hardly occurs. On the other hand, between the inner surface of the metal cap and the core wire, the dissimilar metals are in contact with each other. It does n’t come. As a result, it is possible to reliably prevent electrolytic corrosion at the connection portion between the electric wire and the terminal fitting without using an anticorrosive agent.

In the configuration 1 of the present invention, the coating is made of resin, and the end of the remaining coating is thermally welded to the metal cap to seal between the metal cap and the remaining coating end. It is good.
According to such a configuration, it is possible to prevent water from entering the metal cap by thermally welding the remaining end of the coating to the metal cap.

In the configuration 1 of the present invention, the metal cap may be squeezed to seal between the remaining coated terminal and the core wire.
According to such a configuration, it is possible to prevent water from entering the metal cap from the inside of the electric wire.

<Configuration 2 of the present invention>
In addition, the electric wire with a terminal metal fitting of the present invention is an electric wire having a metal core wire covered with a coating, and the metal core is made of a different kind of metal and provided with an electric wire connecting portion connected to the electric wire, A resin cap that is made of resin and is attached to the end of the core wire exposed by peeling off the coating of the electric wire, and exposes the core wire between the remaining coating, and the terminal fitting and ionization It has a concavo-convex surface which is made of a metal having a close tendency and is crimped to the core wire exposed between the resin cap and the remaining terminal of the coating, and the concavo-convex surface is crimped to the exposed core wire. And a metal sleeve that is crimped to the wire connection portion of the terminal fitting in a state of sealing between the terminal of the resin cap and sealing between the terminal of the remaining coating. However, it has characteristics.

  According to such a structure, the area | region from the terminal of the exposed core wire to the terminal of the coating | cover remaining is covered with the resin cap and the metal sleeve, and the terminal of the exposed core wire is waterproofed. Further, the gap between the end of the resin cap and the metal sleeve is sealed, and the gap between the remaining end of the coating and the metal sleeve is sealed, thereby preventing water from entering the metal sleeve. And the electric connection between a core wire and a terminal metal fitting is taken by crimping | bonding the electric wire connection part of a terminal metal fitting to a metal cap.

  In the crimped portion of the wire connecting portion, the metals that are close to ionization are in contact with each other, so even if moisture adheres, electrolytic corrosion hardly occurs. On the other hand, between the inner surface of the metal sleeve and the core wire, the dissimilar metals are in contact with each other. It does n’t come. As a result, it is possible to reliably prevent electrolytic corrosion at the connection portion between the electric wire and the terminal fitting without using an anticorrosive agent.

In Configuration 2 of the present invention, the coating is made of resin, and the one end of the metal sleeve and the remaining end of the coating are thermally welded to the one end of the metal sleeve. It is good also as a structure which seals between.
According to such a configuration, the remaining end of the coating is thermally welded to one end of the metal sleeve, thereby preventing water from entering from the one end into the metal sleeve.

In Configuration 2 of the present invention, the coating is made of resin, and the end of the resin cap is thermally welded to the other end of the metal sleeve to seal between the other end of the metal sleeve and the end of the resin cap. It is good also as composition to do.
According to such a configuration, it is possible to prevent water from entering from the other terminal into the metal sleeve by thermally welding the remaining terminal of the coating to the other terminal of the metal sleeve.

In the configuration 2 of the present invention, one end of the metal sleeve may be squeezed to seal between the remaining end of the covering and the core wire.
According to such a configuration, it is possible to prevent water from entering the metal sleeve from the inside of the electric wire.

In Configuration 2 of the present invention, the coating is made of resin, and the resin cap thermally welds the opening opposite to the remaining coating among the separated coatings separated by peeling the coating. It is good also as a structure sealed by.
According to such a configuration, the separation coating can be used as a resin cap without being discarded.

Furthermore, as an embodiment of the present invention, the following configuration may be adopted.
(1) While the electric wire is an aluminum electric wire having a core wire made of aluminum or aluminum alloy, the terminal fitting is made of copper alloy.
If it does in this way, generation | occurrence | production of electrolytic corrosion can be prevented effectively also when using the aluminum electric wire with high possibility of electrolytic corrosion.

(2) While the said core wire consists of a twisted wire which twisted together the several strand, the said uneven surface contains the edge extended in the direction which cross | intersects with respect to the axial direction of the said strand.
If it does in this way, when a core wire consists of a twisted wire, since a core wire can be easily hooked to an edge, the coming-off prevention of an electric wire can be strengthened.

  ADVANTAGE OF THE INVENTION According to this invention, the electric corrosion of the connection part of an electric wire and a terminal metal fitting can be prevented reliably, without using a corrosion inhibitor.

The exploded perspective view of the electric wire with a terminal metal fitting in Embodiment 1 1 is an exploded perspective view of the state in which the metal cap of FIG. 1 is crimped to the core wire of the aluminum electric wire. The perspective view of the electric wire with a terminal metal fitting in the state where both barrels of FIG. 2 were crimped to a metal cap FIG. 3 is a longitudinal sectional view showing the internal structure of both barrels in FIG. The exploded perspective view of the electric wire with a terminal metal fitting in Embodiment 2 FIG. 5 is an exploded perspective view showing a state where the metal sleeve of FIG. 5 is crimped to the core of the aluminum electric wire. The perspective view of the electric wire with a terminal metal fitting in the state where both barrels of FIG. 6 were crimped to a metal sleeve FIG. 7 is a longitudinal sectional view showing the internal structure of both barrels in FIG. The longitudinal cross-sectional view which shows the internal structure of both the barrels in Embodiment 3.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to the drawings of FIGS. In this embodiment, the case where it applies to the aluminum electric wire 10 is illustrated, and as shown in FIG. 1, the aluminum electric wire 10, the female side metal fitting 20 (henceforth, female terminal metal fitting 20), the metal cap 30, The female terminal metal fitting with an aluminum electric wire provided with the serration member 40 is illustrated.

  As shown in FIG. 1, the aluminum electric wire 10 has a core wire 11 formed by a stranded wire formed by twisting a plurality of aluminum or aluminum alloy wires 12, and an insulating coating made of synthetic resin is formed around the core wire 11. 13 is covered with the structure. The insulating coating 13 is made of a resin and is made of a synthetic resin that can be thermally welded, such as vinyl chloride.

  The female terminal fitting 20 is formed by pressing a copper alloy plate and is behind the terminal connecting portion 21 having a substantially rectangular tube shape that is electrically connected to a mating male terminal fitting (not shown). The wire barrel 25 and the insulation barrel 26 are provided. The wire barrel 25 and the insulation barrel 26 constitute an electric wire connecting portion of the present invention.

  As shown in FIG. 4, an elastic contact piece 23 is provided inside the terminal connection portion 21 so as to be folded back from the front edge of the bottom plate 22. The tabs of the terminal fitting are inserted from the front and elastically contacted with the elastic contact piece 23, whereby the male terminal fitting and the female terminal fitting 20 are electrically connected.

  First, the metal cap 30 will be described. The metal cap 30 is formed by deep drawing a copper alloy plate like the female terminal fitting 20 and the like. I am doing. As will be described later, the metal cap 30 is attached over the end of the insulating coating 13 left from the end of the core wire 11 exposed by peeling off the insulating coating 13 of the aluminum electric wire 10. Of the portion covered with the metal cap 30, the core wire 11 is firmly crimped and crimped by a hexagonal crimping method or the like. On the other hand, the insulation coating 13 is caulked and crimped into a substantially circular shape under pressure conditions that are not broken by the pressure bonding.

  The metal cap 30 is crimped and crimped to the insulating coating 13 left after being peeled. Thereby, the space between the remaining insulating coating 13 and the metal cap 30 is sealed, and water immersion from the outside of the metal cap 30 into the metal cap 30 is prevented. Further, as the metal cap 30 is caulked and crimped, the remaining insulating coating 13 is caulked and crimped to the core wire 11 accommodated therein. As a result, the space between the remaining insulating coating 13 and the core wire 11 is sealed, and water immersion from the remaining insulating coating 13 into the metal cap 30 is prevented.

  Furthermore, the remaining insulation coating 13 is thermally welded to the end of the metal cap 30, and the gap between the end of the metal cap 30 and the remaining insulation coating 13 is also sealed. That is, waterproofing from the outside of the metal cap 30 into the metal cap 30 is reinforced by a double seal structure including a seal by crimping the metal cap 30 and a seal by heat welding the insulating coating 13. On the other hand, a part of the heat-insulated insulating coating 13 penetrates into the core wire 11, so that the waterproofing from the remaining insulating coating 13 to the metal cap 30 is enhanced.

  The wire barrel 25 provided on the female terminal fitting 20 is of an open barrel type, and a pair of left and right wide barrel pieces 25 </ b> A are formed to rise from the left and right side edges of the bottom plate 22. The wire barrel 25 is caulked and crimped to a region crimped to the end of the core wire 11 among the metal cap 30 crimped to the end of the aluminum electric wire 10 described above, and the protruding ends of both barrel pieces 25A are connected to each other. The outer periphery of the metal cap 30 is embraced from both the left and right sides while being overlapped, so that it can be caulked into a so-called overlap type.

  The insulation barrel 26 is also of an open barrel type, and a pair of left and right barrel pieces 26A which are narrower and taller than the barrel piece 25A on the wire barrel 25 side are also opposed to each other from the left and right side edges of the bottom plate 22. In this way, it is formed to rise. The insulation barrel 26 is caulked and crimped to a region of the metal cap 30 that is crimped to the end of the insulating coating 13, and is also caulked in an overlapping manner.

  The serration member 40 is formed by pressing a copper alloy plate like the female terminal fitting 20, and is bent in a substantially U shape with the crimping surface 42 facing inward. On the crimping surface 42 of the serration member 40, a plurality of concave grooves having a knurled shape of a twill are formed. The serration member 40 is accommodated inside the metal cap 30 in a state where the surface on which the concave groove is formed is wound around the core wire 11. When the metal cap 30 is caulked while the serration member 40 is accommodated, the serration member 40 is caulked and crimped to the core wire 11 together with the metal cap 30.

  The concave groove of the serration member 40 is composed of two types of concave grooves 41A and 41B extending in directions intersecting each other, and one of the concave grooves 41A intersects the axial direction of the strand 12 of the core wire 11. Is extended in the direction. Edges (not shown) are formed at the opening edges of the concave grooves 41A and 41B. Since these edges are integrated while biting into the surface of the core wire 11 by caulking and pressing of the metal cap 30, the non-conductive coating formed on the surface of the core wire 11 is removed and connected to the core wire 11 in a conductive manner. be able to. Further, in the one concave groove 41A, when the aluminum electric wire 10 is pulled backward, the edge acts on the strand 12 of the core wire 11 and acts in the direction of preventing the pulling, so that the aluminum electric wire 10 can be prevented from coming off.

  Then, the manufacturing process of the aluminum electric wire with a female terminal metal fitting which concerns on this embodiment is demonstrated. First, as shown in FIG. 1, the terminal of the insulation coating 13 of the aluminum electric wire 10 is peeled off, and the terminal of the core wire 11 is exposed over a predetermined length. A serration member 40 is wound around the outer peripheral surface of the exposed core wire 11. Next, in a state where the serration member 40 is wound around the core wire 11, the metal cap 30 is attached over the end of the insulating coating 13 left from the end of the core wire 11. Thereafter, as shown in FIG. 2, the serration member 40 is crimped to the core wire 11 by crimping the front half side of the metal cap 30 in a hexagonal caulking manner. At the same time, the latter half of the metal cap 30 is crimped by squeezing the insulating coating 13 and the insulating coating 13 is crimped to the core wire 11.

  As described above, when the metal cap 30 is crimped to the end of the aluminum electric wire 10, the female terminal fitting 20 is crimped and connected to the metal cap 30 by the crimping device. Specifically, the crimping device is provided with an anvil and a crimper, and the first half side of the metal cap 30 is arranged with respect to the wire barrel 25 of the female terminal fitting 20, and the second half side of the metal cap 30 is arranged with respect to the insulation barrel 26. The two barrels 25 and 26 are clamped between the anvil and the crimper and are both caulked in an overlapping manner (see FIG. 3).

  In this state, the outer peripheral surface of the core wire 11 and the crimping surface 42 of the serration member 40 are in close contact with each other, and the outer peripheral surface of the serration member 40 and the inner peripheral surface on the front half side of the metal cap 30 are in close contact with each other. . On the other hand, the inner peripheral surface on the rear half side of the metal cap 30 and the outer peripheral surface of the insulating coating 13 are in close contact, and the inner peripheral surface of the insulating coating 13 and the outer peripheral surface of the core wire 11 are in close contact and crimped in a sealed state. Further, the insulating coating 13 is thermally welded to the end of the metal cap 30 by welding means such as ultrasonic welding. As a result, the space between the insulating coating 13 and the end of the metal cap 30 is sealed, and water immersion from the outside of the metal cap 30 into the metal cap 30 and water immersion from the inside of the insulating coating 13 into the metal cap 30 are prevented. . In this manner, an aluminum electric wire with a female terminal fitting in a state where the female terminal fitting 20 is connected to the end of the aluminum electric wire 10 is completed.

  As described above, according to the present embodiment, since the same copper alloy is brought into contact with each other at the crimping portion between the wire barrel 25 and the metal cap 30 of the female terminal fitting 20, even if moisture adheres, It's hard to get up. On the other hand, the dissimilar metals are in contact with each other between the inner surface of the metal cap 30 and the core wire 11 of the aluminum electric wire 10, but since this contact portion, that is, water immersion into the metal cap 30 is prevented, Electric corrosion does not occur. As a result, it is possible to reliably prevent electrolytic corrosion at the connection portion between the aluminum electric wire 10 and the female terminal fitting 20 without using an anticorrosive agent.

  Further, when the aluminum electric wire 10 is used, a non-conductive film is easily formed on the surface of the core wire 11, but in this embodiment, the serration member 40 is interposed between the metal cap 30 and the core wire 11. The coating can be scraped off at the edges of the concave grooves 41 </ b> A and 41 </ b> B of the serration member 40 to be connected to the core wire 11 in a conductive manner. Therefore, the connection reliability between the aluminum electric wire 10 and the female terminal fitting 20 can be improved. In addition, since the crimping | compression-bonding of the serration member 40 is performed by crimping and crimping the metal cap 30, the serration member 40 can be crimped | combined, without adding a separate crimping process.

  In this embodiment, since the female terminal fitting 20 is connected to the metal cap 30, both the wire barrel 25 and the insulation barrel 26 are caulked and crimped to the metal cap 30. Thus, the existing female terminal fitting 20 provided with the wire barrel 25 and the insulation barrel 26 can be applied as it is without preparing a new structure.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIGS. In the second embodiment, the member corresponding to the metal cap 30 in the first embodiment is composed of two members, the resin cap 50 and the metal sleeve 60, and the same configuration, operation, and effect as in the first embodiment are duplicated. The description is omitted. The same reference numerals as those in the first embodiment are used for the same configurations as those in the first embodiment.

  The resin cap 50 is sealed by thermally welding the opening opposite to the remaining insulating coating 13 among the separated coatings separated by peeling off the insulating coating 13. If it does in this way, it can use effectively as resin cap 50, without throwing away separation covering. Further, since the resin cap 50 is in close contact with the outer periphery of the core wire 11, it is difficult for air or water to enter between the core wire 11. For this reason, a non-conductive film or the like is hardly formed on the surface of the core wire 11 inside the resin cap 50.

  The metal sleeve 60 has a cylindrical shape with both ends open, and after pressing a copper alloy plate material to form a concave groove in the pressure-bonding surface 62, the metal sleeve 60 is rolled into a cylindrical shape with the pressure-bonding surface 62 facing inward. It is formed by welding the ends. Further, the axial length of the metal sleeve 60 covers the core wire 11 exposed between the resin cap 50 and the remaining insulating coating 13, and both ends 63 and 64 are further connected to the ends of the resin cap 50. And the remaining end of the insulation coating 13 is set. Further, the inner diameter of the metal sleeve 60 is set to be substantially the same as or slightly larger than the outer diameter of the insulating coating 13 so that the aluminum electric wire 10 can be inserted into the metal sleeve 60.

  A plurality of concave grooves forming a twill knurled shape are formed in the crimping surface 62 of the metal sleeve 60. The concave groove of the metal sleeve 60 performs the same function as the concave grooves 41A and 41B of the first embodiment, and is composed of two types of concave grooves 61A and 61B extending in directions intersecting each other. One concave groove 61A extends in a direction intersecting the axial direction of the strand 12 of the core wire 11, so that when the aluminum electric wire 10 is pulled backward, the edge bites into the strand 12 of the core wire 11 and pulls it. Since it acts in the direction to prevent, the aluminum wire 10 can be prevented from coming off.

  Then, the manufacturing process of the aluminum electric wire with a female terminal metal fitting which concerns on this embodiment is demonstrated. First, as shown in FIG. 5, the core wire 11 is exposed by peeling off the end of the insulating coating 13 of the aluminum electric wire 10. The resin cap 50 is formed by thermally welding and sealing the tip portion of the separation coating separated at this time. The resin cap 50 is attached to the exposed end of the core wire 11, and the end of the core wire 11 is exposed over a predetermined length between the end of the resin cap 50 and the remaining end of the insulating coating 13. Keep it. Then, a metal sleeve 60 is fitted on the exposed outer peripheral surface of the core wire 11.

  The end of the insulation coating 13 left after the skinning is overlaid on one end 63 of the metal sleeve 60, and the end of the resin cap 50 is overlaid on the other end 64 of the metal sleeve 60. The metal sleeve 60 is set in a state in which the core wire 11 exposed between the ends of the insulating coating 13 is covered with the metal sleeve 60. In this state, the metal sleeve 60 is caulked and crimped to the end of the resin cap 50, the exposed core wire 11, and the remaining insulating coating 13 by the crimping device. This crimping is performed by the same crimping method as in the first embodiment.

  When the metal sleeve 60 is caulked and crimped, as shown in FIG. 6, the remaining end of the insulation coating 13 is crimped to one end 63 of the metal sleeve 60. The remaining insulation coating 13 is sealed from the outer peripheral surface of the terminal, and the insulation coating 13 and the metal sleeve 60 are sealed. Further, the end of the resin cap 50 is crimped to the other end 64 of the metal sleeve 60, thereby sealing between the crimping surface 62 of the other end 64 of the metal sleeve 60 and the outer peripheral surface of the end of the resin cap 50.

  The crimping surface 62 of the metal sleeve 60 is firmly crimped and crimped to the core wire 11 exposed between the terminal of the resin cap 50 and the remaining terminal of the insulating coating 13 by a hexagonal caulking method or the like. Thereby, the core wire 11 bites into the edge formed at the opening edge of the concave grooves 61 </ b> A and 61 </ b> B, the non-conductive coating is scraped off by this edge, and the edge is pressed against the core wire 11. Thereby, the aluminum electric wire 10 and the metal sleeve 60 are connected so as to be conductive.

  Further, the remaining insulating coating 13 is thermally welded to one end 63 of the metal sleeve 60 by welding means such as ultrasonic welding. As a result, the gap between the remaining end of the insulating coating 13 and the one end 63 of the metal sleeve 60 is further sealed, so that water can be prevented from entering the metal sleeve 60 from the outside of the metal sleeve 60. Similarly, the end of the resin cap 50 is thermally welded to the other end 64 of the metal sleeve 60. Thereby, the gap between the end of the resin cap 50 and the other end 64 of the metal sleeve 60 is further sealed.

  Next, the female terminal fitting 20 is crimped and connected to the metal sleeve 60 by a crimping device. Specifically, the hexagonal caulking portion of the metal sleeve 60 is disposed on the wire barrel 25 of the female terminal fitting 20, and the remaining insulation coating 13 is disposed on the insulation barrel 26. The barrels 25 and 26 are clamped between the anvil and the crimper and are caulked together in an overlap type (see FIG. 7). Thus, the aluminum electric wire with the female terminal fitting according to the present embodiment is completed.

  As described above, according to the present embodiment, since the same copper alloy is brought into contact with each other at the crimped portion between the wire barrel 25 and the metal sleeve 60 of the female terminal fitting 20, even if moisture adheres, It's hard to get up. On the other hand, between the crimping surface 42 of the metal sleeve 60 and the core wire 11 of the aluminum electric wire 10, dissimilar metals are in contact with each other. Electrocorrosion does not occur in the part. As a result, it is possible to reliably prevent electrolytic corrosion at the connection portion between the aluminum electric wire 10 and the female terminal fitting 20 without using an anticorrosive agent.

  Further, when the aluminum electric wire 10 is used, a non-conductive film is easily formed on the surface of the core wire 11, but in this embodiment, the concave grooves 61A and 61B are formed on the crimping surface 62 of the metal sleeve 60. The coating can be scraped off at the edges of the concave grooves 61 </ b> A and 61 </ b> B, and the edges can be pressed against the core wire 11. Therefore, the connection reliability between the aluminum electric wire 10 and the female terminal fitting 20 can be improved. In addition, since the concave grooves 61A and 61B are formed in the pressure-bonding surface 62 of the metal sleeve 60, the nonconductive film can be scraped off without using a separate serration member.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to the drawing of FIG. In the third embodiment, the plate thickness of the serration member 40 in the first embodiment is increased, and other common configurations, operations, and effects are the same as those in the first embodiment, and thus description thereof is omitted. As shown in FIG. 9, the serration member 70 in the present embodiment is set so as to have substantially the same thickness as the insulating coating 13 in a state where the serration member 70 is crimped to the core wire 11. That is, the plate thickness of the metal flat plate that is the base material of the serration member 70 is set to be approximately equal to the dimension of the step between the core wire 11 and the insulating coating 13.

  As a result, in a state where the serration member 70 is crimped to the core wire 11, the outer peripheral surface of the serration member 70 and the outer peripheral surface of the insulating coating 13 are aligned in the axial direction of the core wire 11. And the axis of the serration member 70 is arranged coaxially. Further, the core wire 11 drawn out from the end of the remaining insulation coating 13 is not bent at a step as in the first embodiment, but is held in the wire barrel 25 while maintaining a straight shape.

  According to such a configuration, since the core wire 11 is not bent to the bottom plate 22 side at the end of the insulating coating 13, for example, when managing the dimension of the core wire 11 exposed from the tip of the wire barrel 25 to the terminal connection portion 21 side. It becomes easy to manage the dimension of the exposed core wire 11. In this respect, in the present embodiment, the core wire 11 is covered with the metal cap 30 and the tip of the core wire 11 is in contact with the inner surface of the metal cap 30, so that it is exposed from the tip of the wire barrel 25 to the terminal connection portion 21 side. It becomes easy to manage the dimension of the metal cap 30 made. Further, since the metal cap 30 is not bent toward the bottom plate 22 between the wire barrel 25 and the insulation barrel 26, the metal cap 30 is forcibly stretched between the barrels 25 and 26 and broken. There is no fear of it.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, both the wire barrel and the insulation are used for pressure bonding to the metal cap. However, the insulation barrel may be removed to include only the wire barrel.
(2) The form of the wire barrel is not limited to the overlap form exemplified in the above embodiment, and the pair of left and right barrel pieces may be arranged so as to be shifted in the axial direction of the core wire. There may be only one piece. Furthermore, it may be a closed barrel type formed in a cylindrical shape in advance before caulking. In short, it is preferable that when the barrel is caulked, it does not break by piercing the cap.

(3) In the above embodiment, the female terminal fitting is exemplified as the terminal fitting to be connected to the terminal of the aluminum electric wire. However, other terminals such as a male terminal fitting having a male tab or an LA terminal having an eyeball-shaped connecting portion. It may be a metal fitting.
(4) The present invention is not limited to the case where a copper alloy terminal fitting is connected to the aluminum electric wire exemplified in the above embodiment, and the core wire of the electric wire and the terminal fitting connected thereto are formed of different metals. In general, it can be widely applied.
(5) Although the concave groove is formed on the pressure-bonding surface in the above embodiment, according to the present invention, convex ribs may be formed on the pressure-bonding surface.

(6) In the above-described embodiment, the thermal welding is performed after squeezing with a barrel. However, according to the present invention, only thermal welding may be performed, or the squeezing may be performed only with a barrel.
(7) In the above embodiment, sealing is performed by squeezing or heat welding with a barrel, but according to the present invention, sealing may be performed by covering with a heat shrinkable tube.
(8) In the above embodiment, although the concave surface having a knurled shape is formed on the crimping surface, according to the present invention, the concave groove having a stripe pattern intersecting with the axial direction of the strand is formed. Also good.

(9) Although the resin cap is formed using the stripped insulating coating in the second embodiment, according to the present invention, a resin cap separate from the stripped insulating coating may be used.
(10) Although the serration member is crimped to the core wire 11 over the entire circumference in the third embodiment, a step is formed in the core wire 11 by crimping the serration member to at least the lower surface side of the core wire 11 according to the present invention. Anything that is not done.

10 ... Aluminum wire (wire)
DESCRIPTION OF SYMBOLS 11 ... Core wire 12 ... Elementary wire 13 ... Insulation coating 20 ... Female terminal metal fitting 25 ... Wire barrel (electric wire connection part)
26 ... Insulation barrel (wire connection part)
30 ... Metal cap 40, 70 ... Serration member 41A, 41B ... Concave groove 42 ... Crimp surface (uneven surface)
50 ... resin cap 60 ... metal sleeve 61A, 61B ... concave groove 62 ... crimp surface (uneven surface)
63 ... One terminal 64 ... Other terminals

Claims (10)

An electric wire with a metal core wire covered with a coating;
The core wire is made of a different kind of metal and has a terminal fitting provided with an electric wire connecting portion to be connected to the electric wire,
A serration member having a concavo-convex surface to be crimped to the core wire exposed by peeling off the coating of the electric wire;
The terminal fitting is made of a metal that is close to ionization, and is crimped over the remaining coating end from the exposed end of the core wire, and sealed between the remaining coating end. , A metal cap that is crimped to the wire connection part;
An electric wire with a terminal fitting, characterized by comprising:   2. The coating is made of resin, and the end of the remaining coating is thermally welded to the metal cap to seal between the metal cap and the remaining coating end. Electric wires with terminal fittings described in 1.   The electric wire with a terminal fitting according to claim 1 or 2, wherein a gap between the remaining end of the covering and the core wire is sealed by squeezing the metal cap. An electric wire with a metal core wire covered with a coating;
The core wire is made of a different kind of metal and has a terminal fitting provided with an electric wire connecting portion to be connected to the electric wire,
A resin cap that is made of resin and is attached to the end of the core wire exposed by peeling off the coating of the electric wire, and exposes the core wire between the remaining coating;
The terminal fitting is made of a metal having a close ionization tendency, and has an uneven surface that is crimped to a core wire exposed between the resin cap and the remaining terminal of the coating, and the uneven surface is exposed. A metal sleeve that is crimped to the wire connecting portion of the terminal fitting in a state of being crimped to the core wire, sealed between the terminal of the resin cap, and sealed between the terminal of the remaining coating ,
An electric wire with a terminal fitting, characterized by comprising:   The coating is made of resin, and the end of the remaining coating is thermally welded to one end of the metal sleeve to seal between the one end of the metal sleeve and the end of the remaining coating. The electric wire with terminal metal fittings according to claim 4 characterized by things.   The coating is made of resin, and the end of the resin cap is thermally welded to the other end of the metal sleeve to seal between the other end of the metal sleeve and the end of the resin cap. Claim | item 4 or the electric wire with a terminal metal fitting of Claim 5.   The terminal fitting according to any one of claims 4 to 6, wherein a seal is provided between the end of the remaining coating and the core wire by squeezing one end of the metal sleeve. With electric wire.   The coating is made of resin, and the resin cap is sealed by thermally welding the opening on the side opposite to the remaining coating among the separated coatings separated by peeling the coating. The electric wire with terminal fitting according to any one of claims 4 to 7, wherein the electric wire is provided with a terminal fitting.   The terminal according to any one of claims 1 to 8, wherein the electric wire is an aluminum electric wire having a core wire made of aluminum or an aluminum alloy, and the terminal fitting is made of a copper alloy. Wire with bracket.   The core wire is formed of a stranded wire obtained by twisting a plurality of strands, and the concavo-convex surface includes an edge extending in a direction intersecting with the axial direction of the strand. The electric wire with a terminal metal fitting according to any one of claims 1 to 9.

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